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JNFrame2/Assets/Plugins/Best HTTP/Source/Decompression/BrotliDecompressor.cs Normal file
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using System;
using BestHTTP.Extensions;
using BestHTTP.PlatformSupport.Memory;
namespace BestHTTP.Decompression
{
public sealed class BrotliDecompressor : IDecompressor
{
#if ((NET_STANDARD_2_1 || UNITY_2021_2_OR_NEWER) && (!(ENABLE_MONO && UNITY_ANDROID) || (!UNITY_WEBGL || UNITY_EDITOR))) && BESTHTTP_ENABLE_BROTLI
private BufferPoolMemoryStream decompressorInputStream;
private BufferPoolMemoryStream decompressorOutputStream;
private System.IO.Compression.BrotliStream decompressorStream;
#endif
private int MinLengthToDecompress = 256;
public static bool IsSupported()
{
// Not enabled under android with the mono runtime
#if ((NET_STANDARD_2_1 || UNITY_2021_2_OR_NEWER) && (!(ENABLE_MONO && UNITY_ANDROID) || (!UNITY_WEBGL || UNITY_EDITOR))) && BESTHTTP_ENABLE_BROTLI
return true;
#else
return false;
#endif
}
public BrotliDecompressor(int minLengthToDecompress)
{
this.MinLengthToDecompress = minLengthToDecompress;
}
public DecompressedData Decompress(byte[] data, int offset, int count, bool forceDecompress = false, bool dataCanBeLarger = false)
{
#if ((NET_STANDARD_2_1 || UNITY_2021_2_OR_NEWER) && (!(ENABLE_MONO && UNITY_ANDROID) || (!UNITY_WEBGL || UNITY_EDITOR))) && BESTHTTP_ENABLE_BROTLI
if (decompressorInputStream == null)
decompressorInputStream = new BufferPoolMemoryStream(count);
if (data != null)
decompressorInputStream.Write(data, offset, count);
if (!forceDecompress && decompressorInputStream.Length < MinLengthToDecompress)
return new DecompressedData(null, 0);
decompressorInputStream.Position = 0;
if (decompressorStream == null)
{
decompressorStream = new System.IO.Compression.BrotliStream(decompressorInputStream,
System.IO.Compression.CompressionMode.Decompress,
true);
}
if (decompressorOutputStream == null)
decompressorOutputStream = new BufferPoolMemoryStream();
decompressorOutputStream.SetLength(0);
byte[] copyBuffer = BufferPool.Get(1024, true);
int readCount;
int sumReadCount = 0;
while ((readCount = decompressorStream.Read(copyBuffer, 0, copyBuffer.Length)) != 0)
{
decompressorOutputStream.Write(copyBuffer, 0, readCount);
sumReadCount += readCount;
}
BufferPool.Release(copyBuffer);
// If no read is done (returned with any data) don't zero out the input stream, as it would delete any not yet used data.
if (sumReadCount > 0)
decompressorStream.SetLength(0);
byte[] result = decompressorOutputStream.ToArray(dataCanBeLarger);
return new DecompressedData(result, dataCanBeLarger ? (int)decompressorOutputStream.Length : result.Length);
#else
return default(DecompressedData);
#endif
}
public void Dispose()
{
#if ((NET_STANDARD_2_1 || UNITY_2021_2_OR_NEWER) && (!(ENABLE_MONO && UNITY_ANDROID) || (!UNITY_WEBGL || UNITY_EDITOR))) && BESTHTTP_ENABLE_BROTLI
this.decompressorStream?.Dispose();
this.decompressorStream = null;
#endif
}
}
}

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JNFrame2/Assets/Plugins/Best HTTP/Source/Decompression/CRC32.cs Normal file
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// CRC32.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2011 Dino Chiesa.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// Last Saved: <2011-August-02 18:25:54>
//
// ------------------------------------------------------------------
//
// This module defines the CRC32 class, which can do the CRC32 algorithm, using
// arbitrary starting polynomials, and bit reversal. The bit reversal is what
// distinguishes this CRC-32 used in BZip2 from the CRC-32 that is used in PKZIP
// files, or GZIP files. This class does both.
//
// ------------------------------------------------------------------
using System;
using Interop = System.Runtime.InteropServices;
namespace BestHTTP.Decompression.Crc
{
/// <summary>
/// Computes a CRC-32. The CRC-32 algorithm is parameterized - you
/// can set the polynomial and enable or disable bit
/// reversal. This can be used for GZIP, BZip2, or ZIP.
/// </summary>
/// <remarks>
/// This type is used internally by DotNetZip; it is generally not used
/// directly by applications wishing to create, read, or manipulate zip
/// archive files.
/// </remarks>
internal class CRC32
{
/// <summary>
/// Indicates the total number of bytes applied to the CRC.
/// </summary>
public Int64 TotalBytesRead
{
get
{
return _TotalBytesRead;
}
}
/// <summary>
/// Indicates the current CRC for all blocks slurped in.
/// </summary>
public Int32 Crc32Result
{
get
{
return unchecked((Int32)(~_register));
}
}
/// <summary>
/// Returns the CRC32 for the specified stream.
/// </summary>
/// <param name="input">The stream over which to calculate the CRC32</param>
/// <returns>the CRC32 calculation</returns>
public Int32 GetCrc32(System.IO.Stream input)
{
return GetCrc32AndCopy(input, null);
}
/// <summary>
/// Returns the CRC32 for the specified stream, and writes the input into the
/// output stream.
/// </summary>
/// <param name="input">The stream over which to calculate the CRC32</param>
/// <param name="output">The stream into which to deflate the input</param>
/// <returns>the CRC32 calculation</returns>
public Int32 GetCrc32AndCopy(System.IO.Stream input, System.IO.Stream output)
{
if (input == null)
throw new Exception("The input stream must not be null.");
unchecked
{
byte[] buffer = new byte[BUFFER_SIZE];
int readSize = BUFFER_SIZE;
_TotalBytesRead = 0;
int count = input.Read(buffer, 0, readSize);
if (output != null) output.Write(buffer, 0, count);
_TotalBytesRead += count;
while (count > 0)
{
SlurpBlock(buffer, 0, count);
count = input.Read(buffer, 0, readSize);
if (output != null) output.Write(buffer, 0, count);
_TotalBytesRead += count;
}
return (Int32)(~_register);
}
}
/// <summary>
/// Get the CRC32 for the given (word,byte) combo. This is a
/// computation defined by PKzip for PKZIP 2.0 (weak) encryption.
/// </summary>
/// <param name="W">The word to start with.</param>
/// <param name="B">The byte to combine it with.</param>
/// <returns>The CRC-ized result.</returns>
public Int32 ComputeCrc32(Int32 W, byte B)
{
return _InternalComputeCrc32((UInt32)W, B);
}
internal Int32 _InternalComputeCrc32(UInt32 W, byte B)
{
return (Int32)(crc32Table[(W ^ B) & 0xFF] ^ (W >> 8));
}
/// <summary>
/// Update the value for the running CRC32 using the given block of bytes.
/// This is useful when using the CRC32() class in a Stream.
/// </summary>
/// <param name="block">block of bytes to slurp</param>
/// <param name="offset">starting point in the block</param>
/// <param name="count">how many bytes within the block to slurp</param>
public void SlurpBlock(byte[] block, int offset, int count)
{
if (block == null)
throw new Exception("The data buffer must not be null.");
// bzip algorithm
for (int i = 0; i < count; i++)
{
int x = offset + i;
byte b = block[x];
if (this.reverseBits)
{
UInt32 temp = (_register >> 24) ^ b;
_register = (_register << 8) ^ crc32Table[temp];
}
else
{
UInt32 temp = (_register & 0x000000FF) ^ b;
_register = (_register >> 8) ^ crc32Table[temp];
}
}
_TotalBytesRead += count;
}
/// <summary>
/// Process one byte in the CRC.
/// </summary>
/// <param name = "b">the byte to include into the CRC . </param>
public void UpdateCRC(byte b)
{
if (this.reverseBits)
{
UInt32 temp = (_register >> 24) ^ b;
_register = (_register << 8) ^ crc32Table[temp];
}
else
{
UInt32 temp = (_register & 0x000000FF) ^ b;
_register = (_register >> 8) ^ crc32Table[temp];
}
}
/// <summary>
/// Process a run of N identical bytes into the CRC.
/// </summary>
/// <remarks>
/// <para>
/// This method serves as an optimization for updating the CRC when a
/// run of identical bytes is found. Rather than passing in a buffer of
/// length n, containing all identical bytes b, this method accepts the
/// byte value and the length of the (virtual) buffer - the length of
/// the run.
/// </para>
/// </remarks>
/// <param name = "b">the byte to include into the CRC. </param>
/// <param name = "n">the number of times that byte should be repeated. </param>
public void UpdateCRC(byte b, int n)
{
while (n-- > 0)
{
if (this.reverseBits)
{
uint temp = (_register >> 24) ^ b;
_register = (_register << 8) ^ crc32Table[(temp >= 0)
? temp
: (temp + 256)];
}
else
{
UInt32 temp = (_register & 0x000000FF) ^ b;
_register = (_register >> 8) ^ crc32Table[(temp >= 0)
? temp
: (temp + 256)];
}
}
}
private static uint ReverseBits(uint data)
{
unchecked
{
uint ret = data;
ret = (ret & 0x55555555) << 1 | (ret >> 1) & 0x55555555;
ret = (ret & 0x33333333) << 2 | (ret >> 2) & 0x33333333;
ret = (ret & 0x0F0F0F0F) << 4 | (ret >> 4) & 0x0F0F0F0F;
ret = (ret << 24) | ((ret & 0xFF00) << 8) | ((ret >> 8) & 0xFF00) | (ret >> 24);
return ret;
}
}
private static byte ReverseBits(byte data)
{
unchecked
{
uint u = (uint)data * 0x00020202;
uint m = 0x01044010;
uint s = u & m;
uint t = (u << 2) & (m << 1);
return (byte)((0x01001001 * (s + t)) >> 24);
}
}
private void GenerateLookupTable()
{
crc32Table = new UInt32[256];
unchecked
{
UInt32 dwCrc;
byte i = 0;
do
{
dwCrc = i;
for (byte j = 8; j > 0; j--)
{
if ((dwCrc & 1) == 1)
{
dwCrc = (dwCrc >> 1) ^ dwPolynomial;
}
else
{
dwCrc >>= 1;
}
}
if (reverseBits)
{
crc32Table[ReverseBits(i)] = ReverseBits(dwCrc);
}
else
{
crc32Table[i] = dwCrc;
}
i++;
} while (i!=0);
}
#if VERBOSE
Console.WriteLine();
Console.WriteLine("private static readonly UInt32[] crc32Table = {");
for (int i = 0; i < crc32Table.Length; i+=4)
{
Console.Write(" ");
for (int j=0; j < 4; j++)
{
Console.Write(" 0x{0:X8}U,", crc32Table[i+j]);
}
Console.WriteLine();
}
Console.WriteLine("};");
Console.WriteLine();
#endif
}
private uint gf2_matrix_times(uint[] matrix, uint vec)
{
uint sum = 0;
int i=0;
while (vec != 0)
{
if ((vec & 0x01)== 0x01)
sum ^= matrix[i];
vec >>= 1;
i++;
}
return sum;
}
private void gf2_matrix_square(uint[] square, uint[] mat)
{
for (int i = 0; i < 32; i++)
square[i] = gf2_matrix_times(mat, mat[i]);
}
/// <summary>
/// Combines the given CRC32 value with the current running total.
/// </summary>
/// <remarks>
/// This is useful when using a divide-and-conquer approach to
/// calculating a CRC. Multiple threads can each calculate a
/// CRC32 on a segment of the data, and then combine the
/// individual CRC32 values at the end.
/// </remarks>
/// <param name="crc">the crc value to be combined with this one</param>
/// <param name="length">the length of data the CRC value was calculated on</param>
public void Combine(int crc, int length)
{
uint[] even = new uint[32]; // even-power-of-two zeros operator
uint[] odd = new uint[32]; // odd-power-of-two zeros operator
if (length == 0)
return;
uint crc1= ~_register;
uint crc2= (uint) crc;
// put operator for one zero bit in odd
odd[0] = this.dwPolynomial; // the CRC-32 polynomial
uint row = 1;
for (int i = 1; i < 32; i++)
{
odd[i] = row;
row <<= 1;
}
// put operator for two zero bits in even
gf2_matrix_square(even, odd);
// put operator for four zero bits in odd
gf2_matrix_square(odd, even);
uint len2 = (uint) length;
// apply len2 zeros to crc1 (first square will put the operator for one
// zero byte, eight zero bits, in even)
do {
// apply zeros operator for this bit of len2
gf2_matrix_square(even, odd);
if ((len2 & 1)== 1)
crc1 = gf2_matrix_times(even, crc1);
len2 >>= 1;
if (len2 == 0)
break;
// another iteration of the loop with odd and even swapped
gf2_matrix_square(odd, even);
if ((len2 & 1)==1)
crc1 = gf2_matrix_times(odd, crc1);
len2 >>= 1;
} while (len2 != 0);
crc1 ^= crc2;
_register= ~crc1;
//return (int) crc1;
return;
}
/// <summary>
/// Create an instance of the CRC32 class using the default settings: no
/// bit reversal, and a polynomial of 0xEDB88320.
/// </summary>
public CRC32() : this(false)
{
}
/// <summary>
/// Create an instance of the CRC32 class, specifying whether to reverse
/// data bits or not.
/// </summary>
/// <param name='reverseBits'>
/// specify true if the instance should reverse data bits.
/// </param>
/// <remarks>
/// <para>
/// In the CRC-32 used by BZip2, the bits are reversed. Therefore if you
/// want a CRC32 with compatibility with BZip2, you should pass true
/// here. In the CRC-32 used by GZIP and PKZIP, the bits are not
/// reversed; Therefore if you want a CRC32 with compatibility with
/// those, you should pass false.
/// </para>
/// </remarks>
public CRC32(bool reverseBits) :
this( unchecked((int)0xEDB88320), reverseBits)
{
}
/// <summary>
/// Create an instance of the CRC32 class, specifying the polynomial and
/// whether to reverse data bits or not.
/// </summary>
/// <param name='polynomial'>
/// The polynomial to use for the CRC, expressed in the reversed (LSB)
/// format: the highest ordered bit in the polynomial value is the
/// coefficient of the 0th power; the second-highest order bit is the
/// coefficient of the 1 power, and so on. Expressed this way, the
/// polynomial for the CRC-32C used in IEEE 802.3, is 0xEDB88320.
/// </param>
/// <param name='reverseBits'>
/// specify true if the instance should reverse data bits.
/// </param>
///
/// <remarks>
/// <para>
/// In the CRC-32 used by BZip2, the bits are reversed. Therefore if you
/// want a CRC32 with compatibility with BZip2, you should pass true
/// here for the <c>reverseBits</c> parameter. In the CRC-32 used by
/// GZIP and PKZIP, the bits are not reversed; Therefore if you want a
/// CRC32 with compatibility with those, you should pass false for the
/// <c>reverseBits</c> parameter.
/// </para>
/// </remarks>
public CRC32(int polynomial, bool reverseBits)
{
this.reverseBits = reverseBits;
this.dwPolynomial = (uint) polynomial;
this.GenerateLookupTable();
}
/// <summary>
/// Reset the CRC-32 class - clear the CRC "remainder register."
/// </summary>
/// <remarks>
/// <para>
/// Use this when employing a single instance of this class to compute
/// multiple, distinct CRCs on multiple, distinct data blocks.
/// </para>
/// </remarks>
public void Reset()
{
_register = 0xFFFFFFFFU;
}
// private member vars
private UInt32 dwPolynomial;
private Int64 _TotalBytesRead;
private bool reverseBits;
private UInt32[] crc32Table;
private const int BUFFER_SIZE = 8192;
private UInt32 _register = 0xFFFFFFFFU;
}
}

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JNFrame2/Assets/Plugins/Best HTTP/Source/Decompression/CRC32.cs.meta Normal file
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JNFrame2/Assets/Plugins/Best HTTP/Source/Decompression/Deflate.cs Normal file
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JNFrame2/Assets/Plugins/Best HTTP/Source/Decompression/DeflateStream.cs Normal file
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// DeflateStream.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009-2010 Dino Chiesa.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2011-July-31 14:48:11>
//
// ------------------------------------------------------------------
//
// This module defines the DeflateStream class, which can be used as a replacement for
// the System.IO.Compression.DeflateStream class in the .NET BCL.
//
// ------------------------------------------------------------------
using System;
namespace BestHTTP.Decompression.Zlib
{
/// <summary>
/// A class for compressing and decompressing streams using the Deflate algorithm.
/// </summary>
///
/// <remarks>
///
/// <para>
/// The DeflateStream is a <see
/// href="http://en.wikipedia.org/wiki/Decorator_pattern">Decorator</see> on a <see
/// cref="System.IO.Stream"/>. It adds DEFLATE compression or decompression to any
/// stream.
/// </para>
///
/// <para>
/// Using this stream, applications can compress or decompress data via stream
/// <c>Read</c> and <c>Write</c> operations. Either compresssion or decompression
/// can occur through either reading or writing. The compression format used is
/// DEFLATE, which is documented in <see
/// href="http://www.ietf.org/rfc/rfc1951.txt">IETF RFC 1951</see>, "DEFLATE
/// Compressed Data Format Specification version 1.3.".
/// </para>
///
/// </remarks>
///
/// <seealso cref="GZipStream" />
public class DeflateStream : System.IO.Stream
{
internal ZlibBaseStream _baseStream;
internal System.IO.Stream _innerStream;
bool _disposed;
/// <summary>
/// Create a DeflateStream using the specified CompressionMode.
/// </summary>
///
/// <remarks>
/// When mode is <c>CompressionMode.Compress</c>, the DeflateStream will use
/// the default compression level. The "captive" stream will be closed when
/// the DeflateStream is closed.
/// </remarks>
///
/// <example>
/// This example uses a DeflateStream to compress data from a file, and writes
/// the compressed data to another file.
/// <code>
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (var raw = System.IO.File.Create(fileToCompress + ".deflated"))
/// {
/// using (Stream compressor = new DeflateStream(raw, CompressionMode.Compress))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n;
/// while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
/// {
/// compressor.Write(buffer, 0, n);
/// }
/// }
/// }
/// }
/// </code>
///
/// <code lang="VB">
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using raw As FileStream = File.Create(fileToCompress &amp; ".deflated")
/// Using compressor As Stream = New DeflateStream(raw, CompressionMode.Compress)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// End Using
/// </code>
/// </example>
/// <param name="stream">The stream which will be read or written.</param>
/// <param name="mode">Indicates whether the DeflateStream will compress or decompress.</param>
public DeflateStream(System.IO.Stream stream, CompressionMode mode)
: this(stream, mode, CompressionLevel.Default, false)
{
}
/// <summary>
/// Create a DeflateStream using the specified CompressionMode and the specified CompressionLevel.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When mode is <c>CompressionMode.Decompress</c>, the level parameter is
/// ignored. The "captive" stream will be closed when the DeflateStream is
/// closed.
/// </para>
///
/// </remarks>
///
/// <example>
///
/// This example uses a DeflateStream to compress data from a file, and writes
/// the compressed data to another file.
///
/// <code>
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (var raw = System.IO.File.Create(fileToCompress + ".deflated"))
/// {
/// using (Stream compressor = new DeflateStream(raw,
/// CompressionMode.Compress,
/// CompressionLevel.BestCompression))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n= -1;
/// while (n != 0)
/// {
/// if (n &gt; 0)
/// compressor.Write(buffer, 0, n);
/// n= input.Read(buffer, 0, buffer.Length);
/// }
/// }
/// }
/// }
/// </code>
///
/// <code lang="VB">
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using raw As FileStream = File.Create(fileToCompress &amp; ".deflated")
/// Using compressor As Stream = New DeflateStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// End Using
/// </code>
/// </example>
/// <param name="stream">The stream to be read or written while deflating or inflating.</param>
/// <param name="mode">Indicates whether the <c>DeflateStream</c> will compress or decompress.</param>
/// <param name="level">A tuning knob to trade speed for effectiveness.</param>
public DeflateStream(System.IO.Stream stream, CompressionMode mode, CompressionLevel level)
: this(stream, mode, level, false)
{
}
/// <summary>
/// Create a <c>DeflateStream</c> using the specified
/// <c>CompressionMode</c>, and explicitly specify whether the
/// stream should be left open after Deflation or Inflation.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This constructor allows the application to request that the captive stream
/// remain open after the deflation or inflation occurs. By default, after
/// <c>Close()</c> is called on the stream, the captive stream is also
/// closed. In some cases this is not desired, for example if the stream is a
/// memory stream that will be re-read after compression. Specify true for
/// the <paramref name="leaveOpen"/> parameter to leave the stream open.
/// </para>
///
/// <para>
/// The <c>DeflateStream</c> will use the default compression level.
/// </para>
///
/// <para>
/// See the other overloads of this constructor for example code.
/// </para>
/// </remarks>
///
/// <param name="stream">
/// The stream which will be read or written. This is called the
/// "captive" stream in other places in this documentation.
/// </param>
///
/// <param name="mode">
/// Indicates whether the <c>DeflateStream</c> will compress or decompress.
/// </param>
///
/// <param name="leaveOpen">true if the application would like the stream to
/// remain open after inflation/deflation.</param>
public DeflateStream(System.IO.Stream stream, CompressionMode mode, bool leaveOpen)
: this(stream, mode, CompressionLevel.Default, leaveOpen)
{
}
/// <summary>
/// Create a <c>DeflateStream</c> using the specified <c>CompressionMode</c>
/// and the specified <c>CompressionLevel</c>, and explicitly specify whether
/// the stream should be left open after Deflation or Inflation.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When mode is <c>CompressionMode.Decompress</c>, the level parameter is ignored.
/// </para>
///
/// <para>
/// This constructor allows the application to request that the captive stream
/// remain open after the deflation or inflation occurs. By default, after
/// <c>Close()</c> is called on the stream, the captive stream is also
/// closed. In some cases this is not desired, for example if the stream is a
/// <see cref="System.IO.MemoryStream"/> that will be re-read after
/// compression. Specify true for the <paramref name="leaveOpen"/> parameter
/// to leave the stream open.
/// </para>
///
/// </remarks>
///
/// <example>
///
/// This example shows how to use a <c>DeflateStream</c> to compress data from
/// a file, and store the compressed data into another file.
///
/// <code>
/// using (var output = System.IO.File.Create(fileToCompress + ".deflated"))
/// {
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (Stream compressor = new DeflateStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, true))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n= -1;
/// while (n != 0)
/// {
/// if (n &gt; 0)
/// compressor.Write(buffer, 0, n);
/// n= input.Read(buffer, 0, buffer.Length);
/// }
/// }
/// }
/// // can write additional data to the output stream here
/// }
/// </code>
///
/// <code lang="VB">
/// Using output As FileStream = File.Create(fileToCompress &amp; ".deflated")
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using compressor As Stream = New DeflateStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, True)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// ' can write additional data to the output stream here.
/// End Using
/// </code>
/// </example>
/// <param name="stream">The stream which will be read or written.</param>
/// <param name="mode">Indicates whether the DeflateStream will compress or decompress.</param>
/// <param name="leaveOpen">true if the application would like the stream to remain open after inflation/deflation.</param>
/// <param name="level">A tuning knob to trade speed for effectiveness.</param>
public DeflateStream(System.IO.Stream stream, CompressionMode mode, CompressionLevel level, bool leaveOpen)
{
_innerStream = stream;
_baseStream = new ZlibBaseStream(stream, mode, level, ZlibStreamFlavor.DEFLATE, leaveOpen);
}
/// <summary>
/// Create a <c>DeflateStream</c> using the specified <c>CompressionMode</c>
/// and the specified <c>CompressionLevel</c>, and explicitly specify whether
/// the stream should be left open after Deflation or Inflation.
/// </summary>
///
/// <remarks>
///
/// <para>
/// When mode is <c>CompressionMode.Decompress</c>, the level parameter is ignored.
/// </para>
///
/// <para>
/// This constructor allows the application to request that the captive stream
/// remain open after the deflation or inflation occurs. By default, after
/// <c>Close()</c> is called on the stream, the captive stream is also
/// closed. In some cases this is not desired, for example if the stream is a
/// <see cref="System.IO.MemoryStream"/> that will be re-read after
/// compression. Specify true for the <paramref name="leaveOpen"/> parameter
/// to leave the stream open.
/// </para>
///
/// </remarks>
///
/// <example>
///
/// This example shows how to use a <c>DeflateStream</c> to compress data from
/// a file, and store the compressed data into another file.
///
/// <code>
/// using (var output = System.IO.File.Create(fileToCompress + ".deflated"))
/// {
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (Stream compressor = new DeflateStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, true))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n= -1;
/// while (n != 0)
/// {
/// if (n &gt; 0)
/// compressor.Write(buffer, 0, n);
/// n= input.Read(buffer, 0, buffer.Length);
/// }
/// }
/// }
/// // can write additional data to the output stream here
/// }
/// </code>
///
/// <code lang="VB">
/// Using output As FileStream = File.Create(fileToCompress &amp; ".deflated")
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using compressor As Stream = New DeflateStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, True)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// ' can write additional data to the output stream here.
/// End Using
/// </code>
/// </example>
/// <param name="stream">The stream which will be read or written.</param>
/// <param name="mode">Indicates whether the DeflateStream will compress or decompress.</param>
/// <param name="leaveOpen">true if the application would like the stream to remain open after inflation/deflation.</param>
/// <param name="level">A tuning knob to trade speed for effectiveness.</param>
/// <param name="windowBits">Desired window bits.</param>
public DeflateStream(System.IO.Stream stream, CompressionMode mode, CompressionLevel level, bool leaveOpen, int windowBits)
{
_innerStream = stream;
_baseStream = new ZlibBaseStream(stream, mode, level, ZlibStreamFlavor.DEFLATE, leaveOpen, windowBits);
}
#region Zlib properties
/// <summary>
/// This property sets the flush behavior on the stream.
/// </summary>
/// <remarks> See the ZLIB documentation for the meaning of the flush behavior.
/// </remarks>
virtual public FlushType FlushMode
{
get { return (this._baseStream._flushMode); }
set
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
this._baseStream._flushMode = value;
}
}
/// <summary>
/// The size of the working buffer for the compression codec.
/// </summary>
///
/// <remarks>
/// <para>
/// The working buffer is used for all stream operations. The default size is
/// 1024 bytes. The minimum size is 128 bytes. You may get better performance
/// with a larger buffer. Then again, you might not. You would have to test
/// it.
/// </para>
///
/// <para>
/// Set this before the first call to <c>Read()</c> or <c>Write()</c> on the
/// stream. If you try to set it afterwards, it will throw.
/// </para>
/// </remarks>
public int BufferSize
{
get
{
return this._baseStream._bufferSize;
}
set
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
if (this._baseStream._workingBuffer != null)
throw new ZlibException("The working buffer is already set.");
if (value < ZlibConstants.WorkingBufferSizeMin)
throw new ZlibException(String.Format("Don't be silly. {0} bytes?? Use a bigger buffer, at least {1}.", value, ZlibConstants.WorkingBufferSizeMin));
this._baseStream._bufferSize = value;
}
}
/// <summary>
/// The ZLIB strategy to be used during compression.
/// </summary>
///
/// <remarks>
/// By tweaking this parameter, you may be able to optimize the compression for
/// data with particular characteristics.
/// </remarks>
public CompressionStrategy Strategy
{
get
{
return this._baseStream.Strategy;
}
set
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
this._baseStream.Strategy = value;
}
}
/// <summary> Returns the total number of bytes input so far.</summary>
virtual public long TotalIn
{
get
{
return this._baseStream._z.TotalBytesIn;
}
}
/// <summary> Returns the total number of bytes output so far.</summary>
virtual public long TotalOut
{
get
{
return this._baseStream._z.TotalBytesOut;
}
}
#endregion
#region System.IO.Stream methods
/// <summary>
/// Dispose the stream.
/// </summary>
/// <remarks>
/// <para>
/// This may or may not result in a <c>Close()</c> call on the captive
/// stream. See the constructors that have a <c>leaveOpen</c> parameter
/// for more information.
/// </para>
/// <para>
/// Application code won't call this code directly. This method may be
/// invoked in two distinct scenarios. If disposing == true, the method
/// has been called directly or indirectly by a user's code, for example
/// via the public Dispose() method. In this case, both managed and
/// unmanaged resources can be referenced and disposed. If disposing ==
/// false, the method has been called by the runtime from inside the
/// object finalizer and this method should not reference other objects;
/// in that case only unmanaged resources must be referenced or
/// disposed.
/// </para>
/// </remarks>
/// <param name="disposing">
/// true if the Dispose method was invoked by user code.
/// </param>
protected override void Dispose(bool disposing)
{
try
{
if (!_disposed)
{
if (disposing && (this._baseStream != null))
this._baseStream.Close();
_disposed = true;
}
}
finally
{
base.Dispose(disposing);
}
}
/// <summary>
/// Indicates whether the stream can be read.
/// </summary>
/// <remarks>
/// The return value depends on whether the captive stream supports reading.
/// </remarks>
public override bool CanRead
{
get
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
return _baseStream._stream.CanRead;
}
}
/// <summary>
/// Indicates whether the stream supports Seek operations.
/// </summary>
/// <remarks>
/// Always returns false.
/// </remarks>
public override bool CanSeek
{
get { return false; }
}
/// <summary>
/// Indicates whether the stream can be written.
/// </summary>
/// <remarks>
/// The return value depends on whether the captive stream supports writing.
/// </remarks>
public override bool CanWrite
{
get
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
return _baseStream._stream.CanWrite;
}
}
/// <summary>
/// Flush the stream.
/// </summary>
public override void Flush()
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
_baseStream.Flush();
}
/// <summary>
/// Reading this property always throws a <see cref="NotImplementedException"/>.
/// </summary>
public override long Length
{
get { throw new NotImplementedException(); }
}
/// <summary>
/// The position of the stream pointer.
/// </summary>
///
/// <remarks>
/// Setting this property always throws a <see
/// cref="NotImplementedException"/>. Reading will return the total bytes
/// written out, if used in writing, or the total bytes read in, if used in
/// reading. The count may refer to compressed bytes or uncompressed bytes,
/// depending on how you've used the stream.
/// </remarks>
public override long Position
{
get
{
if (this._baseStream._streamMode == BestHTTP.Decompression.Zlib.ZlibBaseStream.StreamMode.Writer)
return this._baseStream._z.TotalBytesOut;
if (this._baseStream._streamMode == BestHTTP.Decompression.Zlib.ZlibBaseStream.StreamMode.Reader)
return this._baseStream._z.TotalBytesIn;
return 0;
}
set { throw new NotImplementedException(); }
}
/// <summary>
/// Read data from the stream.
/// </summary>
/// <remarks>
///
/// <para>
/// If you wish to use the <c>DeflateStream</c> to compress data while
/// reading, you can create a <c>DeflateStream</c> with
/// <c>CompressionMode.Compress</c>, providing an uncompressed data stream.
/// Then call Read() on that <c>DeflateStream</c>, and the data read will be
/// compressed as you read. If you wish to use the <c>DeflateStream</c> to
/// decompress data while reading, you can create a <c>DeflateStream</c> with
/// <c>CompressionMode.Decompress</c>, providing a readable compressed data
/// stream. Then call Read() on that <c>DeflateStream</c>, and the data read
/// will be decompressed as you read.
/// </para>
///
/// <para>
/// A <c>DeflateStream</c> can be used for <c>Read()</c> or <c>Write()</c>, but not both.
/// </para>
///
/// </remarks>
/// <param name="buffer">The buffer into which the read data should be placed.</param>
/// <param name="offset">the offset within that data array to put the first byte read.</param>
/// <param name="count">the number of bytes to read.</param>
/// <returns>the number of bytes actually read</returns>
public override int Read(byte[] buffer, int offset, int count)
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
return _baseStream.Read(buffer, offset, count);
}
/// <summary>
/// Calling this method always throws a <see cref="NotImplementedException"/>.
/// </summary>
/// <param name="offset">this is irrelevant, since it will always throw!</param>
/// <param name="origin">this is irrelevant, since it will always throw!</param>
/// <returns>irrelevant!</returns>
public override long Seek(long offset, System.IO.SeekOrigin origin)
{
throw new NotImplementedException();
}
/// <summary>
/// Will call the base stream's SetLength method.
/// </summary>
public override void SetLength(long value)
{
_baseStream.SetLength(value);
}
/// <summary>
/// Write data to the stream.
/// </summary>
/// <remarks>
///
/// <para>
/// If you wish to use the <c>DeflateStream</c> to compress data while
/// writing, you can create a <c>DeflateStream</c> with
/// <c>CompressionMode.Compress</c>, and a writable output stream. Then call
/// <c>Write()</c> on that <c>DeflateStream</c>, providing uncompressed data
/// as input. The data sent to the output stream will be the compressed form
/// of the data written. If you wish to use the <c>DeflateStream</c> to
/// decompress data while writing, you can create a <c>DeflateStream</c> with
/// <c>CompressionMode.Decompress</c>, and a writable output stream. Then
/// call <c>Write()</c> on that stream, providing previously compressed
/// data. The data sent to the output stream will be the decompressed form of
/// the data written.
/// </para>
///
/// <para>
/// A <c>DeflateStream</c> can be used for <c>Read()</c> or <c>Write()</c>,
/// but not both.
/// </para>
///
/// </remarks>
///
/// <param name="buffer">The buffer holding data to write to the stream.</param>
/// <param name="offset">the offset within that data array to find the first byte to write.</param>
/// <param name="count">the number of bytes to write.</param>
public override void Write(byte[] buffer, int offset, int count)
{
if (_disposed) throw new ObjectDisposedException("DeflateStream");
_baseStream.Write(buffer, offset, count);
}
#endregion
}
}

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using System;
using BestHTTP.Extensions;
using BestHTTP.PlatformSupport.Memory;
namespace BestHTTP.Decompression
{
public sealed class GZipDecompressor : IDecompressor
{
private BufferPoolMemoryStream decompressorInputStream;
private BufferPoolMemoryStream decompressorOutputStream;
private Zlib.GZipStream decompressorStream;
private int MinLengthToDecompress = 256;
public GZipDecompressor(int minLengthToDecompress)
{
this.MinLengthToDecompress = minLengthToDecompress;
}
private void CloseDecompressors()
{
if (decompressorStream != null)
decompressorStream.Dispose();
decompressorStream = null;
if (decompressorInputStream != null)
decompressorInputStream.Dispose();
decompressorInputStream = null;
if (decompressorOutputStream != null)
decompressorOutputStream.Dispose();
decompressorOutputStream = null;
}
public DecompressedData Decompress(byte[] data, int offset, int count, bool forceDecompress = false, bool dataCanBeLarger = false)
{
if (decompressorInputStream == null)
decompressorInputStream = new BufferPoolMemoryStream(count);
if (data != null)
decompressorInputStream.Write(data, offset, count);
if (!forceDecompress && decompressorInputStream.Length < MinLengthToDecompress)
return new DecompressedData(null, 0);
decompressorInputStream.Position = 0;
if (decompressorStream == null)
{
decompressorStream = new Zlib.GZipStream(decompressorInputStream,
Zlib.CompressionMode.Decompress,
Zlib.CompressionLevel.Default,
true);
decompressorStream.FlushMode = Zlib.FlushType.Sync;
}
if (decompressorOutputStream == null)
decompressorOutputStream = new BufferPoolMemoryStream();
decompressorOutputStream.SetLength(0);
byte[] copyBuffer = BufferPool.Get(1024, true);
int readCount;
int sumReadCount = 0;
while ((readCount = decompressorStream.Read(copyBuffer, 0, copyBuffer.Length)) != 0)
{
decompressorOutputStream.Write(copyBuffer, 0, readCount);
sumReadCount += readCount;
}
BufferPool.Release(copyBuffer);
// If no read is done (returned with any data) don't zero out the input stream, as it would delete any not yet used data.
if (sumReadCount > 0)
decompressorStream.SetLength(0);
byte[] result = decompressorOutputStream.ToArray(dataCanBeLarger);
return new DecompressedData(result, dataCanBeLarger ? (int)decompressorOutputStream.Length : result.Length);
}
~GZipDecompressor()
{
Dispose();
}
public void Dispose()
{
CloseDecompressors();
GC.SuppressFinalize(this);
}
}
}

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// GZipStream.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2011-July-11 21:42:34>
//
// ------------------------------------------------------------------
//
// This module defines the GZipStream class, which can be used as a replacement for
// the System.IO.Compression.GZipStream class in the .NET BCL. NB: The design is not
// completely OO clean: there is some intelligence in the ZlibBaseStream that reads the
// GZip header.
//
// ------------------------------------------------------------------
using BestHTTP.PlatformSupport.Memory;
using System;
using System.IO;
namespace BestHTTP.Decompression.Zlib
{
/// <summary>
/// A class for compressing and decompressing GZIP streams.
/// </summary>
/// <remarks>
///
/// <para>
/// The <c>GZipStream</c> is a <see
/// href="http://en.wikipedia.org/wiki/Decorator_pattern">Decorator</see> on a
/// <see cref="Stream"/>. It adds GZIP compression or decompression to any
/// stream.
/// </para>
///
/// <para>
/// Like the <c>System.IO.Compression.GZipStream</c> in the .NET Base Class Library, the
/// <c>Ionic.Zlib.GZipStream</c> can compress while writing, or decompress while
/// reading, but not vice versa. The compression method used is GZIP, which is
/// documented in <see href="http://www.ietf.org/rfc/rfc1952.txt">IETF RFC
/// 1952</see>, "GZIP file format specification version 4.3".</para>
///
/// <para>
/// A <c>GZipStream</c> can be used to decompress data (through <c>Read()</c>) or
/// to compress data (through <c>Write()</c>), but not both.
/// </para>
///
/// <para>
/// If you wish to use the <c>GZipStream</c> to compress data, you must wrap it
/// around a write-able stream. As you call <c>Write()</c> on the <c>GZipStream</c>, the
/// data will be compressed into the GZIP format. If you want to decompress data,
/// you must wrap the <c>GZipStream</c> around a readable stream that contains an
/// IETF RFC 1952-compliant stream. The data will be decompressed as you call
/// <c>Read()</c> on the <c>GZipStream</c>.
/// </para>
///
/// <para>
/// Though the GZIP format allows data from multiple files to be concatenated
/// together, this stream handles only a single segment of GZIP format, typically
/// representing a single file.
/// </para>
///
/// </remarks>
///
/// <seealso cref="DeflateStream" />
public class GZipStream : System.IO.Stream
{
// GZip format
// source: http://tools.ietf.org/html/rfc1952
//
// header id: 2 bytes 1F 8B
// compress method 1 byte 8= DEFLATE (none other supported)
// flag 1 byte bitfield (See below)
// mtime 4 bytes time_t (seconds since jan 1, 1970 UTC of the file.
// xflg 1 byte 2 = max compress used , 4 = max speed (can be ignored)
// OS 1 byte OS for originating archive. set to 0xFF in compression.
// extra field length 2 bytes optional - only if FEXTRA is set.
// extra field varies
// filename varies optional - if FNAME is set. zero terminated. ISO-8859-1.
// file comment varies optional - if FCOMMENT is set. zero terminated. ISO-8859-1.
// crc16 1 byte optional - present only if FHCRC bit is set
// compressed data varies
// CRC32 4 bytes
// isize 4 bytes data size modulo 2^32
//
// FLG (FLaGs)
// bit 0 FTEXT - indicates file is ASCII text (can be safely ignored)
// bit 1 FHCRC - there is a CRC16 for the header immediately following the header
// bit 2 FEXTRA - extra fields are present
// bit 3 FNAME - the zero-terminated filename is present. encoding; ISO-8859-1.
// bit 4 FCOMMENT - a zero-terminated file comment is present. encoding: ISO-8859-1
// bit 5 reserved
// bit 6 reserved
// bit 7 reserved
//
// On consumption:
// Extra field is a bunch of nonsense and can be safely ignored.
// Header CRC and OS, likewise.
//
// on generation:
// all optional fields get 0, except for the OS, which gets 255.
//
/// <summary>
/// The comment on the GZIP stream.
/// </summary>
///
/// <remarks>
/// <para>
/// The GZIP format allows for each file to optionally have an associated
/// comment stored with the file. The comment is encoded with the ISO-8859-1
/// code page. To include a comment in a GZIP stream you create, set this
/// property before calling <c>Write()</c> for the first time on the
/// <c>GZipStream</c>.
/// </para>
///
/// <para>
/// When using <c>GZipStream</c> to decompress, you can retrieve this property
/// after the first call to <c>Read()</c>. If no comment has been set in the
/// GZIP bytestream, the Comment property will return <c>null</c>
/// (<c>Nothing</c> in VB).
/// </para>
/// </remarks>
public String Comment
{
get
{
return _Comment;
}
set
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
_Comment = value;
}
}
/// <summary>
/// The FileName for the GZIP stream.
/// </summary>
///
/// <remarks>
///
/// <para>
/// The GZIP format optionally allows each file to have an associated
/// filename. When compressing data (through <c>Write()</c>), set this
/// FileName before calling <c>Write()</c> the first time on the <c>GZipStream</c>.
/// The actual filename is encoded into the GZIP bytestream with the
/// ISO-8859-1 code page, according to RFC 1952. It is the application's
/// responsibility to insure that the FileName can be encoded and decoded
/// correctly with this code page.
/// </para>
///
/// <para>
/// When decompressing (through <c>Read()</c>), you can retrieve this value
/// any time after the first <c>Read()</c>. In the case where there was no filename
/// encoded into the GZIP bytestream, the property will return <c>null</c> (<c>Nothing</c>
/// in VB).
/// </para>
/// </remarks>
public String FileName
{
get { return _FileName; }
set
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
_FileName = value;
if (_FileName == null) return;
if (_FileName.IndexOf("/") != -1)
{
_FileName = _FileName.Replace("/", "\\");
}
if (_FileName.EndsWith("\\"))
throw new Exception("Illegal filename");
if (_FileName.IndexOf("\\") != -1)
{
// trim any leading path
_FileName = Path.GetFileName(_FileName);
}
}
}
/// <summary>
/// The last modified time for the GZIP stream.
/// </summary>
///
/// <remarks>
/// GZIP allows the storage of a last modified time with each GZIP entity.
/// When compressing data, you can set this before the first call to
/// <c>Write()</c>. When decompressing, you can retrieve this value any time
/// after the first call to <c>Read()</c>.
/// </remarks>
public DateTime? LastModified;
/// <summary>
/// The CRC on the GZIP stream.
/// </summary>
/// <remarks>
/// This is used for internal error checking. You probably don't need to look at this property.
/// </remarks>
public int Crc32 { get { return _Crc32; } }
private int _headerByteCount;
internal ZlibBaseStream _baseStream;
bool _disposed;
bool _firstReadDone;
string _FileName;
string _Comment;
int _Crc32;
/// <summary>
/// Create a <c>GZipStream</c> using the specified <c>CompressionMode</c>.
/// </summary>
/// <remarks>
///
/// <para>
/// When mode is <c>CompressionMode.Compress</c>, the <c>GZipStream</c> will use the
/// default compression level.
/// </para>
///
/// <para>
/// As noted in the class documentation, the <c>CompressionMode</c> (Compress
/// or Decompress) also establishes the "direction" of the stream. A
/// <c>GZipStream</c> with <c>CompressionMode.Compress</c> works only through
/// <c>Write()</c>. A <c>GZipStream</c> with
/// <c>CompressionMode.Decompress</c> works only through <c>Read()</c>.
/// </para>
///
/// </remarks>
///
/// <example>
/// This example shows how to use a GZipStream to compress data.
/// <code>
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (var raw = System.IO.File.Create(outputFile))
/// {
/// using (Stream compressor = new GZipStream(raw, CompressionMode.Compress))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n;
/// while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
/// {
/// compressor.Write(buffer, 0, n);
/// }
/// }
/// }
/// }
/// </code>
/// <code lang="VB">
/// Dim outputFile As String = (fileToCompress &amp; ".compressed")
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using raw As FileStream = File.Create(outputFile)
/// Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// End Using
/// </code>
/// </example>
///
/// <example>
/// This example shows how to use a GZipStream to uncompress a file.
/// <code>
/// private void GunZipFile(string filename)
/// {
/// if (!filename.EndsWith(".gz))
/// throw new ArgumentException("filename");
/// var DecompressedFile = filename.Substring(0,filename.Length-3);
/// byte[] working = new byte[WORKING_BUFFER_SIZE];
/// int n= 1;
/// using (System.IO.Stream input = System.IO.File.OpenRead(filename))
/// {
/// using (Stream decompressor= new Ionic.Zlib.GZipStream(input, CompressionMode.Decompress, true))
/// {
/// using (var output = System.IO.File.Create(DecompressedFile))
/// {
/// while (n !=0)
/// {
/// n= decompressor.Read(working, 0, working.Length);
/// if (n > 0)
/// {
/// output.Write(working, 0, n);
/// }
/// }
/// }
/// }
/// }
/// }
/// </code>
///
/// <code lang="VB">
/// Private Sub GunZipFile(ByVal filename as String)
/// If Not (filename.EndsWith(".gz)) Then
/// Throw New ArgumentException("filename")
/// End If
/// Dim DecompressedFile as String = filename.Substring(0,filename.Length-3)
/// Dim working(WORKING_BUFFER_SIZE) as Byte
/// Dim n As Integer = 1
/// Using input As Stream = File.OpenRead(filename)
/// Using decompressor As Stream = new Ionic.Zlib.GZipStream(input, CompressionMode.Decompress, True)
/// Using output As Stream = File.Create(UncompressedFile)
/// Do
/// n= decompressor.Read(working, 0, working.Length)
/// If n > 0 Then
/// output.Write(working, 0, n)
/// End IF
/// Loop While (n > 0)
/// End Using
/// End Using
/// End Using
/// End Sub
/// </code>
/// </example>
///
/// <param name="stream">The stream which will be read or written.</param>
/// <param name="mode">Indicates whether the GZipStream will compress or decompress.</param>
public GZipStream(Stream stream, CompressionMode mode)
: this(stream, mode, CompressionLevel.Default, false)
{
}
/// <summary>
/// Create a <c>GZipStream</c> using the specified <c>CompressionMode</c> and
/// the specified <c>CompressionLevel</c>.
/// </summary>
/// <remarks>
///
/// <para>
/// The <c>CompressionMode</c> (Compress or Decompress) also establishes the
/// "direction" of the stream. A <c>GZipStream</c> with
/// <c>CompressionMode.Compress</c> works only through <c>Write()</c>. A
/// <c>GZipStream</c> with <c>CompressionMode.Decompress</c> works only
/// through <c>Read()</c>.
/// </para>
///
/// </remarks>
///
/// <example>
///
/// This example shows how to use a <c>GZipStream</c> to compress a file into a .gz file.
///
/// <code>
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (var raw = System.IO.File.Create(fileToCompress + ".gz"))
/// {
/// using (Stream compressor = new GZipStream(raw,
/// CompressionMode.Compress,
/// CompressionLevel.BestCompression))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n;
/// while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
/// {
/// compressor.Write(buffer, 0, n);
/// }
/// }
/// }
/// }
/// </code>
///
/// <code lang="VB">
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using raw As FileStream = File.Create(fileToCompress &amp; ".gz")
/// Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// End Using
/// </code>
/// </example>
/// <param name="stream">The stream to be read or written while deflating or inflating.</param>
/// <param name="mode">Indicates whether the <c>GZipStream</c> will compress or decompress.</param>
/// <param name="level">A tuning knob to trade speed for effectiveness.</param>
public GZipStream(Stream stream, CompressionMode mode, CompressionLevel level)
: this(stream, mode, level, false)
{
}
/// <summary>
/// Create a <c>GZipStream</c> using the specified <c>CompressionMode</c>, and
/// explicitly specify whether the stream should be left open after Deflation
/// or Inflation.
/// </summary>
///
/// <remarks>
/// <para>
/// This constructor allows the application to request that the captive stream
/// remain open after the deflation or inflation occurs. By default, after
/// <c>Close()</c> is called on the stream, the captive stream is also
/// closed. In some cases this is not desired, for example if the stream is a
/// memory stream that will be re-read after compressed data has been written
/// to it. Specify true for the <paramref name="leaveOpen"/> parameter to leave
/// the stream open.
/// </para>
///
/// <para>
/// The <see cref="CompressionMode"/> (Compress or Decompress) also
/// establishes the "direction" of the stream. A <c>GZipStream</c> with
/// <c>CompressionMode.Compress</c> works only through <c>Write()</c>. A <c>GZipStream</c>
/// with <c>CompressionMode.Decompress</c> works only through <c>Read()</c>.
/// </para>
///
/// <para>
/// The <c>GZipStream</c> will use the default compression level. If you want
/// to specify the compression level, see <see cref="GZipStream(Stream,
/// CompressionMode, CompressionLevel, bool)"/>.
/// </para>
///
/// <para>
/// See the other overloads of this constructor for example code.
/// </para>
///
/// </remarks>
///
/// <param name="stream">
/// The stream which will be read or written. This is called the "captive"
/// stream in other places in this documentation.
/// </param>
///
/// <param name="mode">Indicates whether the GZipStream will compress or decompress.
/// </param>
///
/// <param name="leaveOpen">
/// true if the application would like the base stream to remain open after
/// inflation/deflation.
/// </param>
public GZipStream(Stream stream, CompressionMode mode, bool leaveOpen)
: this(stream, mode, CompressionLevel.Default, leaveOpen)
{
}
/// <summary>
/// Create a <c>GZipStream</c> using the specified <c>CompressionMode</c> and the
/// specified <c>CompressionLevel</c>, and explicitly specify whether the
/// stream should be left open after Deflation or Inflation.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This constructor allows the application to request that the captive stream
/// remain open after the deflation or inflation occurs. By default, after
/// <c>Close()</c> is called on the stream, the captive stream is also
/// closed. In some cases this is not desired, for example if the stream is a
/// memory stream that will be re-read after compressed data has been written
/// to it. Specify true for the <paramref name="leaveOpen"/> parameter to
/// leave the stream open.
/// </para>
///
/// <para>
/// As noted in the class documentation, the <c>CompressionMode</c> (Compress
/// or Decompress) also establishes the "direction" of the stream. A
/// <c>GZipStream</c> with <c>CompressionMode.Compress</c> works only through
/// <c>Write()</c>. A <c>GZipStream</c> with <c>CompressionMode.Decompress</c> works only
/// through <c>Read()</c>.
/// </para>
///
/// </remarks>
///
/// <example>
/// This example shows how to use a <c>GZipStream</c> to compress data.
/// <code>
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (var raw = System.IO.File.Create(outputFile))
/// {
/// using (Stream compressor = new GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression, true))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n;
/// while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
/// {
/// compressor.Write(buffer, 0, n);
/// }
/// }
/// }
/// }
/// </code>
/// <code lang="VB">
/// Dim outputFile As String = (fileToCompress &amp; ".compressed")
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using raw As FileStream = File.Create(outputFile)
/// Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression, True)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n &lt;&gt; 0)
/// If (n &gt; 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// End Using
/// </code>
/// </example>
/// <param name="stream">The stream which will be read or written.</param>
/// <param name="mode">Indicates whether the GZipStream will compress or decompress.</param>
/// <param name="leaveOpen">true if the application would like the stream to remain open after inflation/deflation.</param>
/// <param name="level">A tuning knob to trade speed for effectiveness.</param>
public GZipStream(Stream stream, CompressionMode mode, CompressionLevel level, bool leaveOpen)
{
_baseStream = new ZlibBaseStream(stream, mode, level, ZlibStreamFlavor.GZIP, leaveOpen);
}
#region Zlib properties
/// <summary>
/// This property sets the flush behavior on the stream.
/// </summary>
virtual public FlushType FlushMode
{
get { return (this._baseStream._flushMode); }
set {
if (_disposed) throw new ObjectDisposedException("GZipStream");
this._baseStream._flushMode = value;
}
}
/// <summary>
/// The size of the working buffer for the compression codec.
/// </summary>
///
/// <remarks>
/// <para>
/// The working buffer is used for all stream operations. The default size is
/// 1024 bytes. The minimum size is 128 bytes. You may get better performance
/// with a larger buffer. Then again, you might not. You would have to test
/// it.
/// </para>
///
/// <para>
/// Set this before the first call to <c>Read()</c> or <c>Write()</c> on the
/// stream. If you try to set it afterwards, it will throw.
/// </para>
/// </remarks>
public int BufferSize
{
get
{
return this._baseStream._bufferSize;
}
set
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
if (this._baseStream._workingBuffer != null)
throw new ZlibException("The working buffer is already set.");
if (value < ZlibConstants.WorkingBufferSizeMin)
throw new ZlibException(String.Format("Don't be silly. {0} bytes?? Use a bigger buffer, at least {1}.", value, ZlibConstants.WorkingBufferSizeMin));
this._baseStream._bufferSize = value;
}
}
/// <summary> Returns the total number of bytes input so far.</summary>
virtual public long TotalIn
{
get
{
return this._baseStream._z.TotalBytesIn;
}
}
/// <summary> Returns the total number of bytes output so far.</summary>
virtual public long TotalOut
{
get
{
return this._baseStream._z.TotalBytesOut;
}
}
#endregion
#region Stream methods
/// <summary>
/// Dispose the stream.
/// </summary>
/// <remarks>
/// <para>
/// This may or may not result in a <c>Close()</c> call on the captive
/// stream. See the constructors that have a <c>leaveOpen</c> parameter
/// for more information.
/// </para>
/// <para>
/// This method may be invoked in two distinct scenarios. If disposing
/// == true, the method has been called directly or indirectly by a
/// user's code, for example via the public Dispose() method. In this
/// case, both managed and unmanaged resources can be referenced and
/// disposed. If disposing == false, the method has been called by the
/// runtime from inside the object finalizer and this method should not
/// reference other objects; in that case only unmanaged resources must
/// be referenced or disposed.
/// </para>
/// </remarks>
/// <param name="disposing">
/// indicates whether the Dispose method was invoked by user code.
/// </param>
protected override void Dispose(bool disposing)
{
try
{
if (!_disposed)
{
if (disposing && (this._baseStream != null))
{
this._baseStream.Close();
this._Crc32 = _baseStream.Crc32;
}
_disposed = true;
}
}
finally
{
base.Dispose(disposing);
}
}
/// <summary>
/// Indicates whether the stream can be read.
/// </summary>
/// <remarks>
/// The return value depends on whether the captive stream supports reading.
/// </remarks>
public override bool CanRead
{
get
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
return _baseStream._stream.CanRead;
}
}
/// <summary>
/// Indicates whether the stream supports Seek operations.
/// </summary>
/// <remarks>
/// Always returns false.
/// </remarks>
public override bool CanSeek
{
get { return false; }
}
/// <summary>
/// Indicates whether the stream can be written.
/// </summary>
/// <remarks>
/// The return value depends on whether the captive stream supports writing.
/// </remarks>
public override bool CanWrite
{
get
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
return _baseStream._stream.CanWrite;
}
}
/// <summary>
/// Flush the stream.
/// </summary>
public override void Flush()
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
_baseStream.Flush();
}
/// <summary>
/// Reading this property always throws a <see cref="NotImplementedException"/>.
/// </summary>
public override long Length
{
get { throw new NotImplementedException(); }
}
/// <summary>
/// The position of the stream pointer.
/// </summary>
///
/// <remarks>
/// Setting this property always throws a <see
/// cref="NotImplementedException"/>. Reading will return the total bytes
/// written out, if used in writing, or the total bytes read in, if used in
/// reading. The count may refer to compressed bytes or uncompressed bytes,
/// depending on how you've used the stream.
/// </remarks>
public override long Position
{
get
{
if (this._baseStream._streamMode == BestHTTP.Decompression.Zlib.ZlibBaseStream.StreamMode.Writer)
return this._baseStream._z.TotalBytesOut + _headerByteCount;
if (this._baseStream._streamMode == BestHTTP.Decompression.Zlib.ZlibBaseStream.StreamMode.Reader)
return this._baseStream._z.TotalBytesIn + this._baseStream._gzipHeaderByteCount;
return 0;
}
set { throw new NotImplementedException(); }
}
/// <summary>
/// Read and decompress data from the source stream.
/// </summary>
///
/// <remarks>
/// With a <c>GZipStream</c>, decompression is done through reading.
/// </remarks>
///
/// <example>
/// <code>
/// byte[] working = new byte[WORKING_BUFFER_SIZE];
/// using (System.IO.Stream input = System.IO.File.OpenRead(_CompressedFile))
/// {
/// using (Stream decompressor= new Ionic.Zlib.GZipStream(input, CompressionMode.Decompress, true))
/// {
/// using (var output = System.IO.File.Create(_DecompressedFile))
/// {
/// int n;
/// while ((n= decompressor.Read(working, 0, working.Length)) !=0)
/// {
/// output.Write(working, 0, n);
/// }
/// }
/// }
/// }
/// </code>
/// </example>
/// <param name="buffer">The buffer into which the decompressed data should be placed.</param>
/// <param name="offset">the offset within that data array to put the first byte read.</param>
/// <param name="count">the number of bytes to read.</param>
/// <returns>the number of bytes actually read</returns>
public override int Read(byte[] buffer, int offset, int count)
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
int n = _baseStream.Read(buffer, offset, count);
// Console.WriteLine("GZipStream::Read(buffer, off({0}), c({1}) = {2}", offset, count, n);
// Console.WriteLine( Util.FormatByteArray(buffer, offset, n) );
if (!_firstReadDone)
{
_firstReadDone = true;
FileName = _baseStream._GzipFileName;
Comment = _baseStream._GzipComment;
}
return n;
}
/// <summary>
/// Calling this method always throws a <see cref="NotImplementedException"/>.
/// </summary>
/// <param name="offset">irrelevant; it will always throw!</param>
/// <param name="origin">irrelevant; it will always throw!</param>
/// <returns>irrelevant!</returns>
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotImplementedException();
}
/// <summary>
/// Calling this method always throws a <see cref="NotImplementedException"/>.
/// </summary>
/// <param name="value">irrelevant; this method will always throw!</param>
public override void SetLength(long value)
{
//throw new NotImplementedException();
_baseStream.SetLength(value);
}
/// <summary>
/// Write data to the stream.
/// </summary>
///
/// <remarks>
/// <para>
/// If you wish to use the <c>GZipStream</c> to compress data while writing,
/// you can create a <c>GZipStream</c> with <c>CompressionMode.Compress</c>, and a
/// writable output stream. Then call <c>Write()</c> on that <c>GZipStream</c>,
/// providing uncompressed data as input. The data sent to the output stream
/// will be the compressed form of the data written.
/// </para>
///
/// <para>
/// A <c>GZipStream</c> can be used for <c>Read()</c> or <c>Write()</c>, but not
/// both. Writing implies compression. Reading implies decompression.
/// </para>
///
/// </remarks>
/// <param name="buffer">The buffer holding data to write to the stream.</param>
/// <param name="offset">the offset within that data array to find the first byte to write.</param>
/// <param name="count">the number of bytes to write.</param>
public override void Write(byte[] buffer, int offset, int count)
{
if (_disposed) throw new ObjectDisposedException("GZipStream");
if (_baseStream._streamMode == BestHTTP.Decompression.Zlib.ZlibBaseStream.StreamMode.Undefined)
{
//Console.WriteLine("GZipStream: First write");
if (_baseStream._wantCompress)
{
// first write in compression, therefore, emit the GZIP header
_headerByteCount = EmitHeader();
}
else
{
throw new InvalidOperationException();
}
}
_baseStream.Write(buffer, offset, count);
}
#endregion
internal static readonly System.DateTime _unixEpoch = new System.DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
internal static readonly System.Text.Encoding iso8859dash1 = System.Text.Encoding.GetEncoding("iso-8859-1");
private int EmitHeader()
{
byte[] commentBytes = (Comment == null) ? null : iso8859dash1.GetBytes(Comment);
byte[] filenameBytes = (FileName == null) ? null : iso8859dash1.GetBytes(FileName);
int cbLength = (Comment == null) ? 0 : commentBytes.Length + 1;
int fnLength = (FileName == null) ? 0 : filenameBytes.Length + 1;
int bufferLength = 10 + cbLength + fnLength;
byte[] header = BufferPool.Get(bufferLength, true);
int i = 0;
// ID
header[i++] = 0x1F;
header[i++] = 0x8B;
// compression method
header[i++] = 8;
byte flag = 0;
if (Comment != null)
flag ^= 0x10;
if (FileName != null)
flag ^= 0x8;
// flag
header[i++] = flag;
// mtime
if (!LastModified.HasValue) LastModified = DateTime.Now;
System.TimeSpan delta = LastModified.Value - _unixEpoch;
Int32 timet = (Int32)delta.TotalSeconds;
Array.Copy(BitConverter.GetBytes(timet), 0, header, i, 4);
i += 4;
// xflg
header[i++] = 0; // this field is totally useless
// OS
header[i++] = 0xFF; // 0xFF == unspecified
// extra field length - only if FEXTRA is set, which it is not.
//header[i++]= 0;
//header[i++]= 0;
// filename
if (fnLength != 0)
{
Array.Copy(filenameBytes, 0, header, i, fnLength - 1);
i += fnLength - 1;
header[i++] = 0; // terminate
}
// comment
if (cbLength != 0)
{
Array.Copy(commentBytes, 0, header, i, cbLength - 1);
i += cbLength - 1;
header[i++] = 0; // terminate
}
_baseStream._stream.Write(header, 0, i);
int headerLength = header.Length;
BufferPool.Release(header);
return headerLength; // bytes written
}
}
}

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fileFormatVersion: 2
guid: be79ee53ca164d04cbbb654f7de657f5
MonoImporter:
serializedVersion: 2
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executionOrder: 0
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using System;
using System.IO;
using BestHTTP.Logger;
namespace BestHTTP.Decompression
{
public struct DecompressedData
{
public readonly byte[] Data;
public readonly int Length;
internal DecompressedData(byte[] data, int length)
{
this.Data = data;
this.Length = length;
}
}
public interface IDecompressor : IDisposable
{
DecompressedData Decompress(byte[] data, int offset, int count, bool forceDecompress = false, bool dataCanBeLarger = false);
}
public static class DecompressorFactory
{
public const int MinLengthToDecompress = 256;
public static void SetupHeaders(HTTPRequest request)
{
if (!request.HasHeader("Accept-Encoding"))
{
#if BESTHTTP_DISABLE_GZIP
request.AddHeader("Accept-Encoding", "identity");
#else
if (BrotliDecompressor.IsSupported())
request.AddHeader("Accept-Encoding", "br, gzip, identity");
else
request.AddHeader("Accept-Encoding", "gzip, identity");
#endif
}
}
public static IDecompressor GetDecompressor(string encoding, LoggingContext context)
{
if (encoding == null)
return null;
switch (encoding.ToLowerInvariant())
{
case "identity":
case "utf-8":
break;
case "gzip": return new Decompression.GZipDecompressor(MinLengthToDecompress);
case "br":
if (Decompression.BrotliDecompressor.IsSupported())
return new Decompression.BrotliDecompressor(MinLengthToDecompress);
else
goto default;
default:
HTTPManager.Logger.Warning("DecompressorFactory", "GetDecompressor - unsupported encoding: " + encoding, context);
break;
}
return null;
}
/// <summary>
/// Returns with a properly set up GZip/Deflate/Brotli stream, or null if the encoding is null or compiled for WebGl.
/// </summary>
public static Stream GetDecoderStream(Stream streamToDecode, string encoding)
{
if (streamToDecode == null)
throw new ArgumentNullException(nameof(streamToDecode));
if (string.IsNullOrEmpty(encoding))
return null;
switch (encoding)
{
#if !UNITY_WEBGL || UNITY_EDITOR
case "gzip": return new Decompression.Zlib.GZipStream(streamToDecode, Decompression.Zlib.CompressionMode.Decompress);
case "deflate": return new Decompression.Zlib.DeflateStream(streamToDecode, Decompression.Zlib.CompressionMode.Decompress);
#if (NET_STANDARD_2_1 || UNITY_2021_2_OR_NEWER) && BESTHTTP_ENABLE_BROTLI
case "br": return new System.IO.Compression.BrotliStream(streamToDecode, System.IO.Compression.CompressionMode.Decompress, true);
#endif
#endif
//identity, utf-8, etc. Or compiled for WebGl.
default:
// Do not copy from one stream to an other, just return with the raw bytes
return null;
}
}
}
}

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defaultReferences: []
executionOrder: 0
icon: {instanceID: 0}
userData:
assetBundleName:
assetBundleVariant:

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// Inftree.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2009-October-28 12:43:54>
//
// ------------------------------------------------------------------
//
// This module defines classes used in decompression. This code is derived
// from the jzlib implementation of zlib. In keeping with the license for jzlib,
// the copyright to that code is below.
//
// ------------------------------------------------------------------
//
// Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the distribution.
//
// 3. The names of the authors may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
// INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------
//
// This program is based on zlib-1.1.3; credit to authors
// Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
// and contributors of zlib.
//
// -----------------------------------------------------------------------
using System;
namespace BestHTTP.Decompression.Zlib
{
sealed class InfTree
{
private const int MANY = 1440;
private const int Z_OK = 0;
private const int Z_STREAM_END = 1;
private const int Z_NEED_DICT = 2;
private const int Z_ERRNO = - 1;
private const int Z_STREAM_ERROR = - 2;
private const int Z_DATA_ERROR = - 3;
private const int Z_MEM_ERROR = - 4;
private const int Z_BUF_ERROR = - 5;
private const int Z_VERSION_ERROR = - 6;
internal const int fixed_bl = 9;
internal const int fixed_bd = 5;
//UPGRADE_NOTE: Final was removed from the declaration of 'fixed_tl'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
internal static readonly int[] fixed_tl = new int[]{96, 7, 256, 0, 8, 80, 0, 8, 16, 84, 8, 115, 82, 7, 31, 0, 8, 112, 0, 8, 48, 0, 9, 192, 80, 7, 10, 0, 8, 96, 0, 8, 32, 0, 9, 160, 0, 8, 0, 0, 8, 128, 0, 8, 64, 0, 9, 224, 80, 7, 6, 0, 8, 88, 0, 8, 24, 0, 9, 144, 83, 7, 59, 0, 8, 120, 0, 8, 56, 0, 9, 208, 81, 7, 17, 0, 8, 104, 0, 8, 40, 0, 9, 176, 0, 8, 8, 0, 8, 136, 0, 8, 72, 0, 9, 240, 80, 7, 4, 0, 8, 84, 0, 8, 20, 85, 8, 227, 83, 7, 43, 0, 8, 116, 0, 8, 52, 0, 9, 200, 81, 7, 13, 0, 8, 100, 0, 8, 36, 0, 9, 168, 0, 8, 4, 0, 8, 132, 0, 8, 68, 0, 9, 232, 80, 7, 8, 0, 8, 92, 0, 8, 28, 0, 9, 152, 84, 7, 83, 0, 8, 124, 0, 8, 60, 0, 9, 216, 82, 7, 23, 0, 8, 108, 0, 8, 44, 0, 9, 184, 0, 8, 12, 0, 8, 140, 0, 8, 76, 0, 9, 248, 80, 7, 3, 0, 8, 82, 0, 8, 18, 85, 8, 163, 83, 7, 35, 0, 8, 114, 0, 8, 50, 0, 9, 196, 81, 7, 11, 0, 8, 98, 0, 8, 34, 0, 9, 164, 0, 8, 2, 0, 8, 130, 0, 8, 66, 0, 9, 228, 80, 7, 7, 0, 8, 90, 0, 8, 26, 0, 9, 148, 84, 7, 67, 0, 8, 122, 0, 8, 58, 0, 9, 212, 82, 7, 19, 0, 8, 106, 0, 8, 42, 0, 9, 180, 0, 8, 10, 0, 8, 138, 0, 8, 74, 0, 9, 244, 80, 7, 5, 0, 8, 86, 0, 8, 22, 192, 8, 0, 83, 7, 51, 0, 8, 118, 0, 8, 54, 0, 9, 204, 81, 7, 15, 0, 8, 102, 0, 8, 38, 0, 9, 172, 0, 8, 6, 0, 8, 134, 0, 8, 70, 0, 9, 236, 80, 7, 9, 0, 8, 94, 0, 8, 30, 0, 9, 156, 84, 7, 99, 0, 8, 126, 0, 8, 62, 0, 9, 220, 82, 7, 27, 0, 8, 110, 0, 8, 46, 0, 9, 188, 0, 8, 14, 0, 8, 142, 0, 8, 78, 0, 9, 252, 96, 7, 256, 0, 8, 81, 0, 8, 17, 85, 8, 131, 82, 7, 31, 0, 8, 113, 0, 8, 49, 0, 9, 194, 80, 7, 10, 0, 8, 97, 0, 8, 33, 0, 9, 162, 0, 8, 1, 0, 8, 129, 0, 8, 65, 0, 9, 226, 80, 7, 6, 0, 8, 89, 0, 8, 25, 0, 9, 146, 83, 7, 59, 0, 8, 121, 0, 8, 57, 0, 9, 210, 81, 7, 17, 0, 8, 105, 0, 8, 41, 0, 9, 178, 0, 8, 9, 0, 8, 137, 0, 8, 73, 0, 9, 242, 80, 7, 4, 0, 8, 85, 0, 8, 21, 80, 8, 258, 83, 7, 43, 0, 8, 117, 0, 8, 53, 0, 9, 202, 81, 7, 13, 0, 8, 101, 0, 8, 37, 0, 9, 170, 0, 8, 5, 0, 8, 133, 0, 8, 69, 0, 9, 234, 80, 7, 8, 0, 8, 93, 0, 8, 29, 0, 9, 154, 84, 7, 83, 0, 8, 125, 0, 8, 61, 0, 9, 218, 82, 7, 23, 0, 8, 109, 0, 8, 45, 0, 9, 186,
0, 8, 13, 0, 8, 141, 0, 8, 77, 0, 9, 250, 80, 7, 3, 0, 8, 83, 0, 8, 19, 85, 8, 195, 83, 7, 35, 0, 8, 115, 0, 8, 51, 0, 9, 198, 81, 7, 11, 0, 8, 99, 0, 8, 35, 0, 9, 166, 0, 8, 3, 0, 8, 131, 0, 8, 67, 0, 9, 230, 80, 7, 7, 0, 8, 91, 0, 8, 27, 0, 9, 150, 84, 7, 67, 0, 8, 123, 0, 8, 59, 0, 9, 214, 82, 7, 19, 0, 8, 107, 0, 8, 43, 0, 9, 182, 0, 8, 11, 0, 8, 139, 0, 8, 75, 0, 9, 246, 80, 7, 5, 0, 8, 87, 0, 8, 23, 192, 8, 0, 83, 7, 51, 0, 8, 119, 0, 8, 55, 0, 9, 206, 81, 7, 15, 0, 8, 103, 0, 8, 39, 0, 9, 174, 0, 8, 7, 0, 8, 135, 0, 8, 71, 0, 9, 238, 80, 7, 9, 0, 8, 95, 0, 8, 31, 0, 9, 158, 84, 7, 99, 0, 8, 127, 0, 8, 63, 0, 9, 222, 82, 7, 27, 0, 8, 111, 0, 8, 47, 0, 9, 190, 0, 8, 15, 0, 8, 143, 0, 8, 79, 0, 9, 254, 96, 7, 256, 0, 8, 80, 0, 8, 16, 84, 8, 115, 82, 7, 31, 0, 8, 112, 0, 8, 48, 0, 9, 193, 80, 7, 10, 0, 8, 96, 0, 8, 32, 0, 9, 161, 0, 8, 0, 0, 8, 128, 0, 8, 64, 0, 9, 225, 80, 7, 6, 0, 8, 88, 0, 8, 24, 0, 9, 145, 83, 7, 59, 0, 8, 120, 0, 8, 56, 0, 9, 209, 81, 7, 17, 0, 8, 104, 0, 8, 40, 0, 9, 177, 0, 8, 8, 0, 8, 136, 0, 8, 72, 0, 9, 241, 80, 7, 4, 0, 8, 84, 0, 8, 20, 85, 8, 227, 83, 7, 43, 0, 8, 116, 0, 8, 52, 0, 9, 201, 81, 7, 13, 0, 8, 100, 0, 8, 36, 0, 9, 169, 0, 8, 4, 0, 8, 132, 0, 8, 68, 0, 9, 233, 80, 7, 8, 0, 8, 92, 0, 8, 28, 0, 9, 153, 84, 7, 83, 0, 8, 124, 0, 8, 60, 0, 9, 217, 82, 7, 23, 0, 8, 108, 0, 8, 44, 0, 9, 185, 0, 8, 12, 0, 8, 140, 0, 8, 76, 0, 9, 249, 80, 7, 3, 0, 8, 82, 0, 8, 18, 85, 8, 163, 83, 7, 35, 0, 8, 114, 0, 8, 50, 0, 9, 197, 81, 7, 11, 0, 8, 98, 0, 8, 34, 0, 9, 165, 0, 8, 2, 0, 8, 130, 0, 8, 66, 0, 9, 229, 80, 7, 7, 0, 8, 90, 0, 8, 26, 0, 9, 149, 84, 7, 67, 0, 8, 122, 0, 8, 58, 0, 9, 213, 82, 7, 19, 0, 8, 106, 0, 8, 42, 0, 9, 181, 0, 8, 10, 0, 8, 138, 0, 8, 74, 0, 9, 245, 80, 7, 5, 0, 8, 86, 0, 8, 22, 192, 8, 0, 83, 7, 51, 0, 8, 118, 0, 8, 54, 0, 9, 205, 81, 7, 15, 0, 8, 102, 0, 8, 38, 0, 9, 173, 0, 8, 6, 0, 8, 134, 0, 8, 70, 0, 9, 237, 80, 7, 9, 0, 8, 94, 0, 8, 30, 0, 9, 157, 84, 7, 99, 0, 8, 126, 0, 8, 62, 0, 9, 221, 82, 7, 27, 0, 8, 110, 0, 8, 46, 0, 9, 189, 0, 8,
14, 0, 8, 142, 0, 8, 78, 0, 9, 253, 96, 7, 256, 0, 8, 81, 0, 8, 17, 85, 8, 131, 82, 7, 31, 0, 8, 113, 0, 8, 49, 0, 9, 195, 80, 7, 10, 0, 8, 97, 0, 8, 33, 0, 9, 163, 0, 8, 1, 0, 8, 129, 0, 8, 65, 0, 9, 227, 80, 7, 6, 0, 8, 89, 0, 8, 25, 0, 9, 147, 83, 7, 59, 0, 8, 121, 0, 8, 57, 0, 9, 211, 81, 7, 17, 0, 8, 105, 0, 8, 41, 0, 9, 179, 0, 8, 9, 0, 8, 137, 0, 8, 73, 0, 9, 243, 80, 7, 4, 0, 8, 85, 0, 8, 21, 80, 8, 258, 83, 7, 43, 0, 8, 117, 0, 8, 53, 0, 9, 203, 81, 7, 13, 0, 8, 101, 0, 8, 37, 0, 9, 171, 0, 8, 5, 0, 8, 133, 0, 8, 69, 0, 9, 235, 80, 7, 8, 0, 8, 93, 0, 8, 29, 0, 9, 155, 84, 7, 83, 0, 8, 125, 0, 8, 61, 0, 9, 219, 82, 7, 23, 0, 8, 109, 0, 8, 45, 0, 9, 187, 0, 8, 13, 0, 8, 141, 0, 8, 77, 0, 9, 251, 80, 7, 3, 0, 8, 83, 0, 8, 19, 85, 8, 195, 83, 7, 35, 0, 8, 115, 0, 8, 51, 0, 9, 199, 81, 7, 11, 0, 8, 99, 0, 8, 35, 0, 9, 167, 0, 8, 3, 0, 8, 131, 0, 8, 67, 0, 9, 231, 80, 7, 7, 0, 8, 91, 0, 8, 27, 0, 9, 151, 84, 7, 67, 0, 8, 123, 0, 8, 59, 0, 9, 215, 82, 7, 19, 0, 8, 107, 0, 8, 43, 0, 9, 183, 0, 8, 11, 0, 8, 139, 0, 8, 75, 0, 9, 247, 80, 7, 5, 0, 8, 87, 0, 8, 23, 192, 8, 0, 83, 7, 51, 0, 8, 119, 0, 8, 55, 0, 9, 207, 81, 7, 15, 0, 8, 103, 0, 8, 39, 0, 9, 175, 0, 8, 7, 0, 8, 135, 0, 8, 71, 0, 9, 239, 80, 7, 9, 0, 8, 95, 0, 8, 31, 0, 9, 159, 84, 7, 99, 0, 8, 127, 0, 8, 63, 0, 9, 223, 82, 7, 27, 0, 8, 111, 0, 8, 47, 0, 9, 191, 0, 8, 15, 0, 8, 143, 0, 8, 79, 0, 9, 255};
//UPGRADE_NOTE: Final was removed from the declaration of 'fixed_td'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
internal static readonly int[] fixed_td = new int[]{80, 5, 1, 87, 5, 257, 83, 5, 17, 91, 5, 4097, 81, 5, 5, 89, 5, 1025, 85, 5, 65, 93, 5, 16385, 80, 5, 3, 88, 5, 513, 84, 5, 33, 92, 5, 8193, 82, 5, 9, 90, 5, 2049, 86, 5, 129, 192, 5, 24577, 80, 5, 2, 87, 5, 385, 83, 5, 25, 91, 5, 6145, 81, 5, 7, 89, 5, 1537, 85, 5, 97, 93, 5, 24577, 80, 5, 4, 88, 5, 769, 84, 5, 49, 92, 5, 12289, 82, 5, 13, 90, 5, 3073, 86, 5, 193, 192, 5, 24577};
// Tables for deflate from PKZIP's appnote.txt.
//UPGRADE_NOTE: Final was removed from the declaration of 'cplens'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
internal static readonly int[] cplens = new int[]{3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
// see note #13 above about 258
//UPGRADE_NOTE: Final was removed from the declaration of 'cplext'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
internal static readonly int[] cplext = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 112, 112};
//UPGRADE_NOTE: Final was removed from the declaration of 'cpdist'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
internal static readonly int[] cpdist = new int[]{1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
//UPGRADE_NOTE: Final was removed from the declaration of 'cpdext'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
internal static readonly int[] cpdext = new int[]{0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
// If BMAX needs to be larger than 16, then h and x[] should be uLong.
internal const int BMAX = 15; // maximum bit length of any code
internal int[] hn = null; // hufts used in space
internal int[] v = null; // work area for huft_build
internal int[] c = null; // bit length count table
internal int[] r = null; // table entity for structure assignment
internal int[] u = null; // table stack
internal int[] x = null; // bit offsets, then code stack
private int huft_build(int[] b, int bindex, int n, int s, int[] d, int[] e, int[] t, int[] m, int[] hp, int[] hn, int[] v)
{
// Given a list of code lengths and a maximum table size, make a set of
// tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
// if the given code set is incomplete (the tables are still built in this
// case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of
// lengths), or Z_MEM_ERROR if not enough memory.
int a; // counter for codes of length k
int f; // i repeats in table every f entries
int g; // maximum code length
int h; // table level
int i; // counter, current code
int j; // counter
int k; // number of bits in current code
int l; // bits per table (returned in m)
int mask; // (1 << w) - 1, to avoid cc -O bug on HP
int p; // pointer into c[], b[], or v[]
int q; // points to current table
int w; // bits before this table == (l * h)
int xp; // pointer into x
int y; // number of dummy codes added
int z; // number of entries in current table
// Generate counts for each bit length
p = 0; i = n;
do
{
c[b[bindex + p]]++; p++; i--; // assume all entries <= BMAX
}
while (i != 0);
if (c[0] == n)
{
// null input--all zero length codes
t[0] = - 1;
m[0] = 0;
return Z_OK;
}
// Find minimum and maximum length, bound *m by those
l = m[0];
for (j = 1; j <= BMAX; j++)
if (c[j] != 0)
break;
k = j; // minimum code length
if (l < j)
{
l = j;
}
for (i = BMAX; i != 0; i--)
{
if (c[i] != 0)
break;
}
g = i; // maximum code length
if (l > i)
{
l = i;
}
m[0] = l;
// Adjust last length count to fill out codes, if needed
for (y = 1 << j; j < i; j++, y <<= 1)
{
if ((y -= c[j]) < 0)
{
return Z_DATA_ERROR;
}
}
if ((y -= c[i]) < 0)
{
return Z_DATA_ERROR;
}
c[i] += y;
// Generate starting offsets into the value table for each length
x[1] = j = 0;
p = 1; xp = 2;
while (--i != 0)
{
// note that i == g from above
x[xp] = (j += c[p]);
xp++;
p++;
}
// Make a table of values in order of bit lengths
i = 0; p = 0;
do
{
if ((j = b[bindex + p]) != 0)
{
v[x[j]++] = i;
}
p++;
}
while (++i < n);
n = x[g]; // set n to length of v
// Generate the Huffman codes and for each, make the table entries
x[0] = i = 0; // first Huffman code is zero
p = 0; // grab values in bit order
h = - 1; // no tables yet--level -1
w = - l; // bits decoded == (l * h)
u[0] = 0; // just to keep compilers happy
q = 0; // ditto
z = 0; // ditto
// go through the bit lengths (k already is bits in shortest code)
for (; k <= g; k++)
{
a = c[k];
while (a-- != 0)
{
// here i is the Huffman code of length k bits for value *p
// make tables up to required level
while (k > w + l)
{
h++;
w += l; // previous table always l bits
// compute minimum size table less than or equal to l bits
z = g - w;
z = (z > l)?l:z; // table size upper limit
if ((f = 1 << (j = k - w)) > a + 1)
{
// try a k-w bit table
// too few codes for k-w bit table
f -= (a + 1); // deduct codes from patterns left
xp = k;
if (j < z)
{
while (++j < z)
{
// try smaller tables up to z bits
if ((f <<= 1) <= c[++xp])
break; // enough codes to use up j bits
f -= c[xp]; // else deduct codes from patterns
}
}
}
z = 1 << j; // table entries for j-bit table
// allocate new table
if (hn[0] + z > MANY)
{
// (note: doesn't matter for fixed)
return Z_DATA_ERROR; // overflow of MANY
}
u[h] = q = hn[0]; // DEBUG
hn[0] += z;
// connect to last table, if there is one
if (h != 0)
{
x[h] = i; // save pattern for backing up
r[0] = (sbyte) j; // bits in this table
r[1] = (sbyte) l; // bits to dump before this table
j = SharedUtils.URShift(i, (w - l));
r[2] = (int) (q - u[h - 1] - j); // offset to this table
Array.Copy(r, 0, hp, (u[h - 1] + j) * 3, 3); // connect to last table
}
else
{
t[0] = q; // first table is returned result
}
}
// set up table entity in r
r[1] = (sbyte) (k - w);
if (p >= n)
{
r[0] = 128 + 64; // out of values--invalid code
}
else if (v[p] < s)
{
r[0] = (sbyte) (v[p] < 256?0:32 + 64); // 256 is end-of-block
r[2] = v[p++]; // simple code is just the value
}
else
{
r[0] = (sbyte) (e[v[p] - s] + 16 + 64); // non-simple--look up in lists
r[2] = d[v[p++] - s];
}
// fill code-like entries with r
f = 1 << (k - w);
for (j = SharedUtils.URShift(i, w); j < z; j += f)
{
Array.Copy(r, 0, hp, (q + j) * 3, 3);
}
// backwards increment the k-bit code i
for (j = 1 << (k - 1); (i & j) != 0; j = SharedUtils.URShift(j, 1))
{
i ^= j;
}
i ^= j;
// backup over finished tables
mask = (1 << w) - 1; // needed on HP, cc -O bug
while ((i & mask) != x[h])
{
h--; // don't need to update q
w -= l;
mask = (1 << w) - 1;
}
}
}
// Return Z_BUF_ERROR if we were given an incomplete table
return y != 0 && g != 1?Z_BUF_ERROR:Z_OK;
}
internal int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZlibCodec z)
{
int result;
initWorkArea(19);
hn[0] = 0;
result = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
if (result == Z_DATA_ERROR)
{
z.Message = "oversubscribed dynamic bit lengths tree";
}
else if (result == Z_BUF_ERROR || bb[0] == 0)
{
z.Message = "incomplete dynamic bit lengths tree";
result = Z_DATA_ERROR;
}
return result;
}
internal int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZlibCodec z)
{
int result;
// build literal/length tree
initWorkArea(288);
hn[0] = 0;
result = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
if (result != Z_OK || bl[0] == 0)
{
if (result == Z_DATA_ERROR)
{
z.Message = "oversubscribed literal/length tree";
}
else if (result != Z_MEM_ERROR)
{
z.Message = "incomplete literal/length tree";
result = Z_DATA_ERROR;
}
return result;
}
// build distance tree
initWorkArea(288);
result = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);
if (result != Z_OK || (bd[0] == 0 && nl > 257))
{
if (result == Z_DATA_ERROR)
{
z.Message = "oversubscribed distance tree";
}
else if (result == Z_BUF_ERROR)
{
z.Message = "incomplete distance tree";
result = Z_DATA_ERROR;
}
else if (result != Z_MEM_ERROR)
{
z.Message = "empty distance tree with lengths";
result = Z_DATA_ERROR;
}
return result;
}
return Z_OK;
}
internal static int inflate_trees_fixed(int[] bl, int[] bd, int[][] tl, int[][] td, ZlibCodec z)
{
bl[0] = fixed_bl;
bd[0] = fixed_bd;
tl[0] = fixed_tl;
td[0] = fixed_td;
return Z_OK;
}
private void initWorkArea(int vsize)
{
if (hn == null)
{
hn = new int[1];
v = new int[vsize];
c = new int[BMAX + 1];
r = new int[3];
u = new int[BMAX];
x = new int[BMAX + 1];
}
else
{
if (v.Length < vsize)
{
v = new int[vsize];
}
Array.Clear(v,0,vsize);
Array.Clear(c,0,BMAX+1);
r[0]=0; r[1]=0; r[2]=0;
// for(int i=0; i<BMAX; i++){u[i]=0;}
//Array.Copy(c, 0, u, 0, BMAX);
Array.Clear(u,0,BMAX);
// for(int i=0; i<BMAX+1; i++){x[i]=0;}
//Array.Copy(c, 0, x, 0, BMAX + 1);
Array.Clear(x,0,BMAX+1);
}
}
}
}

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// Tree.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2009-October-28 13:29:50>
//
// ------------------------------------------------------------------
//
// This module defines classes for zlib compression and
// decompression. This code is derived from the jzlib implementation of
// zlib. In keeping with the license for jzlib, the copyright to that
// code is below.
//
// ------------------------------------------------------------------
//
// Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the distribution.
//
// 3. The names of the authors may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
// INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------
//
// This program is based on zlib-1.1.3; credit to authors
// Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
// and contributors of zlib.
//
// -----------------------------------------------------------------------
using System;
namespace BestHTTP.Decompression.Zlib
{
sealed class ZTree
{
private static readonly int HEAP_SIZE = (2 * InternalConstants.L_CODES + 1);
// extra bits for each length code
internal static readonly int[] ExtraLengthBits = new int[]
{
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0
};
// extra bits for each distance code
internal static readonly int[] ExtraDistanceBits = new int[]
{
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13
};
// extra bits for each bit length code
internal static readonly int[] extra_blbits = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 7};
internal static readonly sbyte[] bl_order = new sbyte[]{16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
// The lengths of the bit length codes are sent in order of decreasing
// probability, to avoid transmitting the lengths for unused bit
// length codes.
internal const int Buf_size = 8 * 2;
// see definition of array dist_code below
//internal const int DIST_CODE_LEN = 512;
private static readonly sbyte[] _dist_code = new sbyte[]
{
0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
0, 0, 16, 17, 18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21,
22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29
};
internal static readonly sbyte[] LengthCode = new sbyte[]
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 8, 9, 9, 10, 10, 11, 11,
12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15,
16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 17, 17,
18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19,
20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28
};
internal static readonly int[] LengthBase = new int[]
{
0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28,
32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 0
};
internal static readonly int[] DistanceBase = new int[]
{
0, 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
256, 384, 512, 768, 1024, 1536, 2048, 3072, 4096, 6144, 8192, 12288, 16384, 24576
};
/// <summary>
/// Map from a distance to a distance code.
/// </summary>
/// <remarks>
/// No side effects. _dist_code[256] and _dist_code[257] are never used.
/// </remarks>
internal static int DistanceCode(int dist)
{
return (dist < 256)
? _dist_code[dist]
: _dist_code[256 + SharedUtils.URShift(dist, 7)];
}
internal short[] dyn_tree; // the dynamic tree
internal int max_code; // largest code with non zero frequency
internal StaticTree staticTree; // the corresponding static tree
// Compute the optimal bit lengths for a tree and update the total bit length
// for the current block.
// IN assertion: the fields freq and dad are set, heap[heap_max] and
// above are the tree nodes sorted by increasing frequency.
// OUT assertions: the field len is set to the optimal bit length, the
// array bl_count contains the frequencies for each bit length.
// The length opt_len is updated; static_len is also updated if stree is
// not null.
internal void gen_bitlen(DeflateManager s)
{
short[] tree = dyn_tree;
short[] stree = staticTree.treeCodes;
int[] extra = staticTree.extraBits;
int base_Renamed = staticTree.extraBase;
int max_length = staticTree.maxLength;
int h; // heap index
int n, m; // iterate over the tree elements
int bits; // bit length
int xbits; // extra bits
short f; // frequency
int overflow = 0; // number of elements with bit length too large
for (bits = 0; bits <= InternalConstants.MAX_BITS; bits++)
s.bl_count[bits] = 0;
// In a first pass, compute the optimal bit lengths (which may
// overflow in the case of the bit length tree).
tree[s.heap[s.heap_max] * 2 + 1] = 0; // root of the heap
for (h = s.heap_max + 1; h < HEAP_SIZE; h++)
{
n = s.heap[h];
bits = tree[tree[n * 2 + 1] * 2 + 1] + 1;
if (bits > max_length)
{
bits = max_length; overflow++;
}
tree[n * 2 + 1] = (short) bits;
// We overwrite tree[n*2+1] which is no longer needed
if (n > max_code)
continue; // not a leaf node
s.bl_count[bits]++;
xbits = 0;
if (n >= base_Renamed)
xbits = extra[n - base_Renamed];
f = tree[n * 2];
s.opt_len += f * (bits + xbits);
if (stree != null)
s.static_len += f * (stree[n * 2 + 1] + xbits);
}
if (overflow == 0)
return ;
// This happens for example on obj2 and pic of the Calgary corpus
// Find the first bit length which could increase:
do
{
bits = max_length - 1;
while (s.bl_count[bits] == 0)
bits--;
s.bl_count[bits]--; // move one leaf down the tree
s.bl_count[bits + 1] = (short) (s.bl_count[bits + 1] + 2); // move one overflow item as its brother
s.bl_count[max_length]--;
// The brother of the overflow item also moves one step up,
// but this does not affect bl_count[max_length]
overflow -= 2;
}
while (overflow > 0);
for (bits = max_length; bits != 0; bits--)
{
n = s.bl_count[bits];
while (n != 0)
{
m = s.heap[--h];
if (m > max_code)
continue;
if (tree[m * 2 + 1] != bits)
{
s.opt_len = (int) (s.opt_len + ((long) bits - (long) tree[m * 2 + 1]) * (long) tree[m * 2]);
tree[m * 2 + 1] = (short) bits;
}
n--;
}
}
}
// Construct one Huffman tree and assigns the code bit strings and lengths.
// Update the total bit length for the current block.
// IN assertion: the field freq is set for all tree elements.
// OUT assertions: the fields len and code are set to the optimal bit length
// and corresponding code. The length opt_len is updated; static_len is
// also updated if stree is not null. The field max_code is set.
internal void build_tree(DeflateManager s)
{
short[] tree = dyn_tree;
short[] stree = staticTree.treeCodes;
int elems = staticTree.elems;
int n, m; // iterate over heap elements
int max_code = -1; // largest code with non zero frequency
int node; // new node being created
// Construct the initial heap, with least frequent element in
// heap[1]. The sons of heap[n] are heap[2*n] and heap[2*n+1].
// heap[0] is not used.
s.heap_len = 0;
s.heap_max = HEAP_SIZE;
for (n = 0; n < elems; n++)
{
if (tree[n * 2] != 0)
{
s.heap[++s.heap_len] = max_code = n;
s.depth[n] = 0;
}
else
{
tree[n * 2 + 1] = 0;
}
}
// The pkzip format requires that at least one distance code exists,
// and that at least one bit should be sent even if there is only one
// possible code. So to avoid special checks later on we force at least
// two codes of non zero frequency.
while (s.heap_len < 2)
{
node = s.heap[++s.heap_len] = (max_code < 2?++max_code:0);
tree[node * 2] = 1;
s.depth[node] = 0;
s.opt_len--;
if (stree != null)
s.static_len -= stree[node * 2 + 1];
// node is 0 or 1 so it does not have extra bits
}
this.max_code = max_code;
// The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
// establish sub-heaps of increasing lengths:
for (n = s.heap_len / 2; n >= 1; n--)
s.pqdownheap(tree, n);
// Construct the Huffman tree by repeatedly combining the least two
// frequent nodes.
node = elems; // next internal node of the tree
do
{
// n = node of least frequency
n = s.heap[1];
s.heap[1] = s.heap[s.heap_len--];
s.pqdownheap(tree, 1);
m = s.heap[1]; // m = node of next least frequency
s.heap[--s.heap_max] = n; // keep the nodes sorted by frequency
s.heap[--s.heap_max] = m;
// Create a new node father of n and m
tree[node * 2] = unchecked((short) (tree[n * 2] + tree[m * 2]));
s.depth[node] = (sbyte) (System.Math.Max((byte) s.depth[n], (byte) s.depth[m]) + 1);
tree[n * 2 + 1] = tree[m * 2 + 1] = (short) node;
// and insert the new node in the heap
s.heap[1] = node++;
s.pqdownheap(tree, 1);
}
while (s.heap_len >= 2);
s.heap[--s.heap_max] = s.heap[1];
// At this point, the fields freq and dad are set. We can now
// generate the bit lengths.
gen_bitlen(s);
// The field len is now set, we can generate the bit codes
gen_codes(tree, max_code, s.bl_count);
}
// Generate the codes for a given tree and bit counts (which need not be
// optimal).
// IN assertion: the array bl_count contains the bit length statistics for
// the given tree and the field len is set for all tree elements.
// OUT assertion: the field code is set for all tree elements of non
// zero code length.
internal static void gen_codes(short[] tree, int max_code, short[] bl_count)
{
short[] next_code = new short[InternalConstants.MAX_BITS + 1]; // next code value for each bit length
short code = 0; // running code value
int bits; // bit index
int n; // code index
// The distribution counts are first used to generate the code values
// without bit reversal.
for (bits = 1; bits <= InternalConstants.MAX_BITS; bits++)
unchecked {
next_code[bits] = code = (short) ((code + bl_count[bits - 1]) << 1);
}
// Check that the bit counts in bl_count are consistent. The last code
// must be all ones.
//Assert (code + bl_count[MAX_BITS]-1 == (1<<MAX_BITS)-1,
// "inconsistent bit counts");
//Tracev((stderr,"\ngen_codes: max_code %d ", max_code));
for (n = 0; n <= max_code; n++)
{
int len = tree[n * 2 + 1];
if (len == 0)
continue;
// Now reverse the bits
tree[n * 2] = unchecked((short) (bi_reverse(next_code[len]++, len)));
}
}
// Reverse the first len bits of a code, using straightforward code (a faster
// method would use a table)
// IN assertion: 1 <= len <= 15
internal static int bi_reverse(int code, int len)
{
int res = 0;
do
{
res |= code & 1;
code >>= 1; //SharedUtils.URShift(code, 1);
res <<= 1;
}
while (--len > 0);
return res >> 1;
}
}
}

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// Zlib.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009-2011 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// Last Saved: <2011-August-03 19:52:28>
//
// ------------------------------------------------------------------
//
// This module defines classes for ZLIB compression and
// decompression. This code is derived from the jzlib implementation of
// zlib, but significantly modified. The object model is not the same,
// and many of the behaviors are new or different. Nonetheless, in
// keeping with the license for jzlib, the copyright to that code is
// included below.
//
// ------------------------------------------------------------------
//
// The following notice applies to jzlib:
//
// Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the distribution.
//
// 3. The names of the authors may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
// INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------
//
// jzlib is based on zlib-1.1.3.
//
// The following notice applies to zlib:
//
// -----------------------------------------------------------------------
//
// Copyright (C) 1995-2004 Jean-loup Gailly and Mark Adler
//
// The ZLIB software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
//
// Jean-loup Gailly jloup@gzip.org
// Mark Adler madler@alumni.caltech.edu
//
// -----------------------------------------------------------------------
using System;
using Interop=System.Runtime.InteropServices;
namespace BestHTTP.Decompression.Zlib
{
/// <summary>
/// Describes how to flush the current deflate operation.
/// </summary>
/// <remarks>
/// The different FlushType values are useful when using a Deflate in a streaming application.
/// </remarks>
public enum FlushType
{
/// <summary>No flush at all.</summary>
None = 0,
/// <summary>Closes the current block, but doesn't flush it to
/// the output. Used internally only in hypothetical
/// scenarios. This was supposed to be removed by Zlib, but it is
/// still in use in some edge cases.
/// </summary>
Partial,
/// <summary>
/// Use this during compression to specify that all pending output should be
/// flushed to the output buffer and the output should be aligned on a byte
/// boundary. You might use this in a streaming communication scenario, so that
/// the decompressor can get all input data available so far. When using this
/// with a ZlibCodec, <c>AvailableBytesIn</c> will be zero after the call if
/// enough output space has been provided before the call. Flushing will
/// degrade compression and so it should be used only when necessary.
/// </summary>
Sync,
/// <summary>
/// Use this during compression to specify that all output should be flushed, as
/// with <c>FlushType.Sync</c>, but also, the compression state should be reset
/// so that decompression can restart from this point if previous compressed
/// data has been damaged or if random access is desired. Using
/// <c>FlushType.Full</c> too often can significantly degrade the compression.
/// </summary>
Full,
/// <summary>Signals the end of the compression/decompression stream.</summary>
Finish,
}
/// <summary>
/// The compression level to be used when using a DeflateStream or ZlibStream with CompressionMode.Compress.
/// </summary>
public enum CompressionLevel
{
/// <summary>
/// None means that the data will be simply stored, with no change at all.
/// If you are producing ZIPs for use on Mac OSX, be aware that archives produced with CompressionLevel.None
/// cannot be opened with the default zip reader. Use a different CompressionLevel.
/// </summary>
None= 0,
/// <summary>
/// Same as None.
/// </summary>
Level0 = 0,
/// <summary>
/// The fastest but least effective compression.
/// </summary>
BestSpeed = 1,
/// <summary>
/// A synonym for BestSpeed.
/// </summary>
Level1 = 1,
/// <summary>
/// A little slower, but better, than level 1.
/// </summary>
Level2 = 2,
/// <summary>
/// A little slower, but better, than level 2.
/// </summary>
Level3 = 3,
/// <summary>
/// A little slower, but better, than level 3.
/// </summary>
Level4 = 4,
/// <summary>
/// A little slower than level 4, but with better compression.
/// </summary>
Level5 = 5,
/// <summary>
/// The default compression level, with a good balance of speed and compression efficiency.
/// </summary>
Default = 6,
/// <summary>
/// A synonym for Default.
/// </summary>
Level6 = 6,
/// <summary>
/// Pretty good compression!
/// </summary>
Level7 = 7,
/// <summary>
/// Better compression than Level7!
/// </summary>
Level8 = 8,
/// <summary>
/// The "best" compression, where best means greatest reduction in size of the input data stream.
/// This is also the slowest compression.
/// </summary>
BestCompression = 9,
/// <summary>
/// A synonym for BestCompression.
/// </summary>
Level9 = 9,
}
/// <summary>
/// Describes options for how the compression algorithm is executed. Different strategies
/// work better on different sorts of data. The strategy parameter can affect the compression
/// ratio and the speed of compression but not the correctness of the compresssion.
/// </summary>
public enum CompressionStrategy
{
/// <summary>
/// The default strategy is probably the best for normal data.
/// </summary>
Default = 0,
/// <summary>
/// The <c>Filtered</c> strategy is intended to be used most effectively with data produced by a
/// filter or predictor. By this definition, filtered data consists mostly of small
/// values with a somewhat random distribution. In this case, the compression algorithm
/// is tuned to compress them better. The effect of <c>Filtered</c> is to force more Huffman
/// coding and less string matching; it is a half-step between <c>Default</c> and <c>HuffmanOnly</c>.
/// </summary>
Filtered = 1,
/// <summary>
/// Using <c>HuffmanOnly</c> will force the compressor to do Huffman encoding only, with no
/// string matching.
/// </summary>
HuffmanOnly = 2,
}
/// <summary>
/// An enum to specify the direction of transcoding - whether to compress or decompress.
/// </summary>
public enum CompressionMode
{
/// <summary>
/// Used to specify that the stream should compress the data.
/// </summary>
Compress= 0,
/// <summary>
/// Used to specify that the stream should decompress the data.
/// </summary>
Decompress = 1,
}
/// <summary>
/// A general purpose exception class for exceptions in the Zlib library.
/// </summary>
[Interop.GuidAttribute("ebc25cf6-9120-4283-b972-0e5520d0000E")]
internal class ZlibException : System.Exception
{
/// <summary>
/// The ZlibException class captures exception information generated
/// by the Zlib library.
/// </summary>
public ZlibException()
: base()
{
}
/// <summary>
/// This ctor collects a message attached to the exception.
/// </summary>
/// <param name="s">the message for the exception.</param>
public ZlibException(System.String s)
: base(s)
{
}
}
internal class SharedUtils
{
/// <summary>
/// Performs an unsigned bitwise right shift with the specified number
/// </summary>
/// <param name="number">Number to operate on</param>
/// <param name="bits">Ammount of bits to shift</param>
/// <returns>The resulting number from the shift operation</returns>
public static int URShift(int number, int bits)
{
return (int)((uint)number >> bits);
}
#if NOT
/// <summary>
/// Performs an unsigned bitwise right shift with the specified number
/// </summary>
/// <param name="number">Number to operate on</param>
/// <param name="bits">Ammount of bits to shift</param>
/// <returns>The resulting number from the shift operation</returns>
public static long URShift(long number, int bits)
{
return (long) ((UInt64)number >> bits);
}
#endif
/// <summary>
/// Reads a number of characters from the current source TextReader and writes
/// the data to the target array at the specified index.
/// </summary>
///
/// <param name="sourceTextReader">The source TextReader to read from</param>
/// <param name="target">Contains the array of characteres read from the source TextReader.</param>
/// <param name="start">The starting index of the target array.</param>
/// <param name="count">The maximum number of characters to read from the source TextReader.</param>
///
/// <returns>
/// The number of characters read. The number will be less than or equal to
/// count depending on the data available in the source TextReader. Returns -1
/// if the end of the stream is reached.
/// </returns>
public static System.Int32 ReadInput(System.IO.TextReader sourceTextReader, byte[] target, int start, int count)
{
// Returns 0 bytes if not enough space in target
if (target.Length == 0) return 0;
char[] charArray = new char[target.Length];
int bytesRead = sourceTextReader.Read(charArray, start, count);
// Returns -1 if EOF
if (bytesRead == 0) return -1;
for (int index = start; index < start + bytesRead; index++)
target[index] = (byte)charArray[index];
return bytesRead;
}
internal static byte[] ToByteArray(System.String sourceString)
{
return System.Text.UTF8Encoding.UTF8.GetBytes(sourceString);
}
internal static char[] ToCharArray(byte[] byteArray)
{
return System.Text.UTF8Encoding.UTF8.GetChars(byteArray);
}
}
internal static class InternalConstants
{
internal static readonly int MAX_BITS = 15;
internal static readonly int BL_CODES = 19;
internal static readonly int D_CODES = 30;
internal static readonly int LITERALS = 256;
internal static readonly int LENGTH_CODES = 29;
internal static readonly int L_CODES = (LITERALS + 1 + LENGTH_CODES);
// Bit length codes must not exceed MAX_BL_BITS bits
internal static readonly int MAX_BL_BITS = 7;
// repeat previous bit length 3-6 times (2 bits of repeat count)
internal static readonly int REP_3_6 = 16;
// repeat a zero length 3-10 times (3 bits of repeat count)
internal static readonly int REPZ_3_10 = 17;
// repeat a zero length 11-138 times (7 bits of repeat count)
internal static readonly int REPZ_11_138 = 18;
}
internal sealed class StaticTree
{
internal static readonly short[] lengthAndLiteralsTreeCodes = new short[] {
12, 8, 140, 8, 76, 8, 204, 8, 44, 8, 172, 8, 108, 8, 236, 8,
28, 8, 156, 8, 92, 8, 220, 8, 60, 8, 188, 8, 124, 8, 252, 8,
2, 8, 130, 8, 66, 8, 194, 8, 34, 8, 162, 8, 98, 8, 226, 8,
18, 8, 146, 8, 82, 8, 210, 8, 50, 8, 178, 8, 114, 8, 242, 8,
10, 8, 138, 8, 74, 8, 202, 8, 42, 8, 170, 8, 106, 8, 234, 8,
26, 8, 154, 8, 90, 8, 218, 8, 58, 8, 186, 8, 122, 8, 250, 8,
6, 8, 134, 8, 70, 8, 198, 8, 38, 8, 166, 8, 102, 8, 230, 8,
22, 8, 150, 8, 86, 8, 214, 8, 54, 8, 182, 8, 118, 8, 246, 8,
14, 8, 142, 8, 78, 8, 206, 8, 46, 8, 174, 8, 110, 8, 238, 8,
30, 8, 158, 8, 94, 8, 222, 8, 62, 8, 190, 8, 126, 8, 254, 8,
1, 8, 129, 8, 65, 8, 193, 8, 33, 8, 161, 8, 97, 8, 225, 8,
17, 8, 145, 8, 81, 8, 209, 8, 49, 8, 177, 8, 113, 8, 241, 8,
9, 8, 137, 8, 73, 8, 201, 8, 41, 8, 169, 8, 105, 8, 233, 8,
25, 8, 153, 8, 89, 8, 217, 8, 57, 8, 185, 8, 121, 8, 249, 8,
5, 8, 133, 8, 69, 8, 197, 8, 37, 8, 165, 8, 101, 8, 229, 8,
21, 8, 149, 8, 85, 8, 213, 8, 53, 8, 181, 8, 117, 8, 245, 8,
13, 8, 141, 8, 77, 8, 205, 8, 45, 8, 173, 8, 109, 8, 237, 8,
29, 8, 157, 8, 93, 8, 221, 8, 61, 8, 189, 8, 125, 8, 253, 8,
19, 9, 275, 9, 147, 9, 403, 9, 83, 9, 339, 9, 211, 9, 467, 9,
51, 9, 307, 9, 179, 9, 435, 9, 115, 9, 371, 9, 243, 9, 499, 9,
11, 9, 267, 9, 139, 9, 395, 9, 75, 9, 331, 9, 203, 9, 459, 9,
43, 9, 299, 9, 171, 9, 427, 9, 107, 9, 363, 9, 235, 9, 491, 9,
27, 9, 283, 9, 155, 9, 411, 9, 91, 9, 347, 9, 219, 9, 475, 9,
59, 9, 315, 9, 187, 9, 443, 9, 123, 9, 379, 9, 251, 9, 507, 9,
7, 9, 263, 9, 135, 9, 391, 9, 71, 9, 327, 9, 199, 9, 455, 9,
39, 9, 295, 9, 167, 9, 423, 9, 103, 9, 359, 9, 231, 9, 487, 9,
23, 9, 279, 9, 151, 9, 407, 9, 87, 9, 343, 9, 215, 9, 471, 9,
55, 9, 311, 9, 183, 9, 439, 9, 119, 9, 375, 9, 247, 9, 503, 9,
15, 9, 271, 9, 143, 9, 399, 9, 79, 9, 335, 9, 207, 9, 463, 9,
47, 9, 303, 9, 175, 9, 431, 9, 111, 9, 367, 9, 239, 9, 495, 9,
31, 9, 287, 9, 159, 9, 415, 9, 95, 9, 351, 9, 223, 9, 479, 9,
63, 9, 319, 9, 191, 9, 447, 9, 127, 9, 383, 9, 255, 9, 511, 9,
0, 7, 64, 7, 32, 7, 96, 7, 16, 7, 80, 7, 48, 7, 112, 7,
8, 7, 72, 7, 40, 7, 104, 7, 24, 7, 88, 7, 56, 7, 120, 7,
4, 7, 68, 7, 36, 7, 100, 7, 20, 7, 84, 7, 52, 7, 116, 7,
3, 8, 131, 8, 67, 8, 195, 8, 35, 8, 163, 8, 99, 8, 227, 8
};
internal static readonly short[] distTreeCodes = new short[] {
0, 5, 16, 5, 8, 5, 24, 5, 4, 5, 20, 5, 12, 5, 28, 5,
2, 5, 18, 5, 10, 5, 26, 5, 6, 5, 22, 5, 14, 5, 30, 5,
1, 5, 17, 5, 9, 5, 25, 5, 5, 5, 21, 5, 13, 5, 29, 5,
3, 5, 19, 5, 11, 5, 27, 5, 7, 5, 23, 5 };
internal static readonly StaticTree Literals;
internal static readonly StaticTree Distances;
internal static readonly StaticTree BitLengths;
internal short[] treeCodes; // static tree or null
internal int[] extraBits; // extra bits for each code or null
internal int extraBase; // base index for extra_bits
internal int elems; // max number of elements in the tree
internal int maxLength; // max bit length for the codes
private StaticTree(short[] treeCodes, int[] extraBits, int extraBase, int elems, int maxLength)
{
this.treeCodes = treeCodes;
this.extraBits = extraBits;
this.extraBase = extraBase;
this.elems = elems;
this.maxLength = maxLength;
}
static StaticTree()
{
Literals = new StaticTree(lengthAndLiteralsTreeCodes, ZTree.ExtraLengthBits, InternalConstants.LITERALS + 1, InternalConstants.L_CODES, InternalConstants.MAX_BITS);
Distances = new StaticTree(distTreeCodes, ZTree.ExtraDistanceBits, 0, InternalConstants.D_CODES, InternalConstants.MAX_BITS);
BitLengths = new StaticTree(null, ZTree.extra_blbits, 0, InternalConstants.BL_CODES, InternalConstants.MAX_BL_BITS);
}
}
/// <summary>
/// Computes an Adler-32 checksum.
/// </summary>
/// <remarks>
/// The Adler checksum is similar to a CRC checksum, but faster to compute, though less
/// reliable. It is used in producing RFC1950 compressed streams. The Adler checksum
/// is a required part of the "ZLIB" standard. Applications will almost never need to
/// use this class directly.
/// </remarks>
///
/// <exclude/>
public sealed class Adler
{
// largest prime smaller than 65536
private static readonly uint BASE = 65521;
// NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1
private static readonly int NMAX = 5552;
#pragma warning disable 3001
#pragma warning disable 3002
/// <summary>
/// Calculates the Adler32 checksum.
/// </summary>
/// <remarks>
/// <para>
/// This is used within ZLIB. You probably don't need to use this directly.
/// </para>
/// </remarks>
/// <example>
/// To compute an Adler32 checksum on a byte array:
/// <code>
/// var adler = Adler.Adler32(0, null, 0, 0);
/// adler = Adler.Adler32(adler, buffer, index, length);
/// </code>
/// </example>
public static uint Adler32(uint adler, byte[] buf, int index, int len)
{
if (buf == null)
return 1;
uint s1 = (uint) (adler & 0xffff);
uint s2 = (uint) ((adler >> 16) & 0xffff);
while (len > 0)
{
int k = len < NMAX ? len : NMAX;
len -= k;
while (k >= 16)
{
//s1 += (buf[index++] & 0xff); s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
s1 += buf[index++]; s2 += s1;
k -= 16;
}
if (k != 0)
{
do
{
s1 += buf[index++];
s2 += s1;
}
while (--k != 0);
}
s1 %= BASE;
s2 %= BASE;
}
return (uint)((s2 << 16) | s1);
}
#pragma warning restore 3001
#pragma warning restore 3002
}
}

10
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@@ -0,0 +1,10 @@
fileFormatVersion: 2
guid: 7d946fbf5f38d4049a7b50fe52bd8b0e
MonoImporter:
serializedVersion: 2
defaultReferences: []
executionOrder: 0
icon: {instanceID: 0}
userData:
assetBundleName:
assetBundleVariant:

607
JNFrame2/Assets/Plugins/Best HTTP/Source/Decompression/ZlibBaseStream.cs Normal file
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// ZlibBaseStream.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2011-August-06 21:22:38>
//
// ------------------------------------------------------------------
//
// This module defines the ZlibBaseStream class, which is an intnernal
// base class for DeflateStream, ZlibStream and GZipStream.
//
// ------------------------------------------------------------------
using BestHTTP.PlatformSupport.Memory;
using System;
using System.IO;
namespace BestHTTP.Decompression.Zlib
{
internal enum ZlibStreamFlavor { ZLIB = 1950, DEFLATE = 1951, GZIP = 1952 }
internal class ZlibBaseStream : System.IO.Stream
{
protected internal ZlibCodec _z = null; // deferred init... new ZlibCodec();
protected internal StreamMode _streamMode = StreamMode.Undefined;
protected internal FlushType _flushMode;
protected internal ZlibStreamFlavor _flavor;
protected internal CompressionMode _compressionMode;
protected internal CompressionLevel _level;
protected internal bool _leaveOpen;
protected internal byte[] _workingBuffer;
protected internal int _bufferSize = ZlibConstants.WorkingBufferSizeDefault;
protected internal int windowBitsMax;
protected internal byte[] _buf1 = new byte[1];
protected internal System.IO.Stream _stream;
protected internal CompressionStrategy Strategy = CompressionStrategy.Default;
// workitem 7159
BestHTTP.Decompression.Crc.CRC32 crc;
protected internal string _GzipFileName;
protected internal string _GzipComment;
protected internal DateTime _GzipMtime;
protected internal int _gzipHeaderByteCount;
internal int Crc32 { get { if (crc == null) return 0; return crc.Crc32Result; } }
public ZlibBaseStream(System.IO.Stream stream,
CompressionMode compressionMode,
CompressionLevel level,
ZlibStreamFlavor flavor,
bool leaveOpen)
:this(stream, compressionMode, level, flavor,leaveOpen, ZlibConstants.WindowBitsDefault)
{ }
public ZlibBaseStream(System.IO.Stream stream,
CompressionMode compressionMode,
CompressionLevel level,
ZlibStreamFlavor flavor,
bool leaveOpen,
int windowBits)
: base()
{
this._flushMode = FlushType.None;
//this._workingBuffer = new byte[WORKING_BUFFER_SIZE_DEFAULT];
this._stream = stream;
this._leaveOpen = leaveOpen;
this._compressionMode = compressionMode;
this._flavor = flavor;
this._level = level;
this.windowBitsMax = windowBits;
// workitem 7159
if (flavor == ZlibStreamFlavor.GZIP)
{
this.crc = new BestHTTP.Decompression.Crc.CRC32();
}
}
protected internal bool _wantCompress
{
get
{
return (this._compressionMode == CompressionMode.Compress);
}
}
private ZlibCodec z
{
get
{
if (_z == null)
{
bool wantRfc1950Header = (this._flavor == ZlibStreamFlavor.ZLIB);
_z = new ZlibCodec();
if (this._compressionMode == CompressionMode.Decompress)
{
_z.InitializeInflate(this.windowBitsMax, wantRfc1950Header);
}
else
{
_z.Strategy = Strategy;
_z.InitializeDeflate(this._level, this.windowBitsMax, wantRfc1950Header);
}
}
return _z;
}
}
private byte[] workingBuffer
{
get
{
if (_workingBuffer == null)
_workingBuffer = BufferPool.Get(_bufferSize, true);
return _workingBuffer;
}
}
public override void Write(System.Byte[] buffer, int offset, int count)
{
// workitem 7159
// calculate the CRC on the unccompressed data (before writing)
if (crc != null)
crc.SlurpBlock(buffer, offset, count);
if (_streamMode == StreamMode.Undefined)
_streamMode = StreamMode.Writer;
else if (_streamMode != StreamMode.Writer)
throw new ZlibException("Cannot Write after Reading.");
if (count == 0)
return;
// first reference of z property will initialize the private var _z
z.InputBuffer = buffer;
_z.NextIn = offset;
_z.AvailableBytesIn = count;
bool done = false;
do
{
_z.OutputBuffer = workingBuffer;
_z.NextOut = 0;
_z.AvailableBytesOut = _workingBuffer.Length;
int rc = (_wantCompress)
? _z.Deflate(_flushMode)
: _z.Inflate(_flushMode);
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
throw new ZlibException((_wantCompress ? "de" : "in") + "flating: " + _z.Message);
//if (_workingBuffer.Length - _z.AvailableBytesOut > 0)
_stream.Write(_workingBuffer, 0, _workingBuffer.Length - _z.AvailableBytesOut);
done = _z.AvailableBytesIn == 0 && _z.AvailableBytesOut != 0;
// If GZIP and de-compress, we're done when 8 bytes remain.
if (_flavor == ZlibStreamFlavor.GZIP && !_wantCompress)
done = (_z.AvailableBytesIn == 8 && _z.AvailableBytesOut != 0);
}
while (!done);
}
private void finish()
{
if (_z == null) return;
if (_streamMode == StreamMode.Writer)
{
bool done = false;
do
{
_z.OutputBuffer = workingBuffer;
_z.NextOut = 0;
_z.AvailableBytesOut = _workingBuffer.Length;
int rc = (_wantCompress)
? _z.Deflate(FlushType.Finish)
: _z.Inflate(FlushType.Finish);
if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK)
{
string verb = (_wantCompress ? "de" : "in") + "flating";
if (_z.Message == null)
throw new ZlibException(String.Format("{0}: (rc = {1})", verb, rc));
else
throw new ZlibException(verb + ": " + _z.Message);
}
if (_workingBuffer.Length - _z.AvailableBytesOut > 0)
{
_stream.Write(_workingBuffer, 0, _workingBuffer.Length - _z.AvailableBytesOut);
}
done = _z.AvailableBytesIn == 0 && _z.AvailableBytesOut != 0;
// If GZIP and de-compress, we're done when 8 bytes remain.
if (_flavor == ZlibStreamFlavor.GZIP && !_wantCompress)
done = (_z.AvailableBytesIn == 8 && _z.AvailableBytesOut != 0);
}
while (!done);
Flush();
// workitem 7159
if (_flavor == ZlibStreamFlavor.GZIP)
{
if (_wantCompress)
{
// Emit the GZIP trailer: CRC32 and size mod 2^32
int c1 = crc.Crc32Result;
_stream.Write(BitConverter.GetBytes(c1), 0, 4);
int c2 = (Int32)(crc.TotalBytesRead & 0x00000000FFFFFFFF);
_stream.Write(BitConverter.GetBytes(c2), 0, 4);
}
else
{
throw new ZlibException("Writing with decompression is not supported.");
}
}
}
// workitem 7159
else if (_streamMode == StreamMode.Reader)
{
if (_flavor == ZlibStreamFlavor.GZIP)
{
if (!_wantCompress)
{
// workitem 8501: handle edge case (decompress empty stream)
if (_z.TotalBytesOut == 0L)
return;
// Read and potentially verify the GZIP trailer:
// CRC32 and size mod 2^32
byte[] trailer = BufferPool.Get(8, true);
// workitems 8679 & 12554
if (_z.AvailableBytesIn < 8)
{
// Make sure we have read to the end of the stream
Array.Copy(_z.InputBuffer, _z.NextIn, trailer, 0, _z.AvailableBytesIn);
int bytesNeeded = 8 - _z.AvailableBytesIn;
int bytesRead = _stream.Read(trailer,
_z.AvailableBytesIn,
bytesNeeded);
if (bytesNeeded != bytesRead)
{
BufferPool.Release(trailer);
throw new ZlibException(String.Format("Missing or incomplete GZIP trailer. Expected 8 bytes, got {0}.",
_z.AvailableBytesIn + bytesRead));
}
}
else
{
Array.Copy(_z.InputBuffer, _z.NextIn, trailer, 0, 8);
}
Int32 crc32_expected = BitConverter.ToInt32(trailer, 0);
Int32 crc32_actual = crc.Crc32Result;
Int32 isize_expected = BitConverter.ToInt32(trailer, 4);
Int32 isize_actual = (Int32)(_z.TotalBytesOut & 0x00000000FFFFFFFF);
if (crc32_actual != crc32_expected)
{
BufferPool.Release(trailer);
throw new ZlibException(String.Format("Bad CRC32 in GZIP trailer. (actual({0:X8})!=expected({1:X8}))", crc32_actual, crc32_expected));
}
if (isize_actual != isize_expected)
{
BufferPool.Release(trailer);
throw new ZlibException(String.Format("Bad size in GZIP trailer. (actual({0})!=expected({1}))", isize_actual, isize_expected));
}
BufferPool.Release(trailer);
}
else
{
throw new ZlibException("Reading with compression is not supported.");
}
}
}
}
private void end()
{
if (z == null)
return;
if (_wantCompress)
{
_z.EndDeflate();
}
else
{
_z.EndInflate();
}
_z = null;
BufferPool.Release(_workingBuffer);
_workingBuffer = null;
}
public
#if !NETFX_CORE
override
#endif
void Close()
{
if (_stream == null) return;
try
{
finish();
}
finally
{
end();
if (!_leaveOpen) _stream.Dispose();
_stream = null;
}
}
public override void Flush()
{
_stream.Flush();
}
public override System.Int64 Seek(System.Int64 offset, System.IO.SeekOrigin origin)
{
throw new NotImplementedException();
//_outStream.Seek(offset, origin);
}
public override void SetLength(System.Int64 value)
{
_stream.SetLength(value);
nomoreinput = false;
}
#if NOT
public int Read()
{
if (Read(_buf1, 0, 1) == 0)
return 0;
// calculate CRC after reading
if (crc!=null)
crc.SlurpBlock(_buf1,0,1);
return (_buf1[0] & 0xFF);
}
#endif
private bool nomoreinput = false;
private string ReadZeroTerminatedString()
{
var list = new System.Collections.Generic.List<byte>();
bool done = false;
do
{
// workitem 7740
int n = _stream.Read(_buf1, 0, 1);
if (n != 1)
throw new ZlibException("Unexpected EOF reading GZIP header.");
else
{
if (_buf1[0] == 0)
done = true;
else
list.Add(_buf1[0]);
}
} while (!done);
byte[] a = list.ToArray();
return GZipStream.iso8859dash1.GetString(a, 0, a.Length);
}
private int _ReadAndValidateGzipHeader()
{
int totalBytesRead = 0;
// read the header on the first read
byte[] header = BufferPool.Get(10, true);
int n = _stream.Read(header, 0, 10);
// workitem 8501: handle edge case (decompress empty stream)
if (n == 0)
{
BufferPool.Release(header);
return 0;
}
if (n != 10)
{
BufferPool.Release(header);
throw new ZlibException("Not a valid GZIP stream.");
}
if (header[0] != 0x1F || header[1] != 0x8B || header[2] != 8)
{
BufferPool.Release(header);
throw new ZlibException("Bad GZIP header.");
}
Int32 timet = BitConverter.ToInt32(header, 4);
_GzipMtime = GZipStream._unixEpoch.AddSeconds(timet);
totalBytesRead += n;
if ((header[3] & 0x04) == 0x04)
{
// read and discard extra field
n = _stream.Read(header, 0, 2); // 2-byte length field
totalBytesRead += n;
Int16 extraLength = (Int16)(header[0] + header[1] * 256);
byte[] extra = BufferPool.Get(extraLength, true);
n = _stream.Read(extra, 0, extraLength);
if (n != extraLength)
{
BufferPool.Release(extra);
BufferPool.Release(header);
throw new ZlibException("Unexpected end-of-file reading GZIP header.");
}
totalBytesRead += n;
}
if ((header[3] & 0x08) == 0x08)
_GzipFileName = ReadZeroTerminatedString();
if ((header[3] & 0x10) == 0x010)
_GzipComment = ReadZeroTerminatedString();
if ((header[3] & 0x02) == 0x02)
Read(_buf1, 0, 1); // CRC16, ignore
BufferPool.Release(header);
return totalBytesRead;
}
public override System.Int32 Read(System.Byte[] buffer, System.Int32 offset, System.Int32 count)
{
// According to MS documentation, any implementation of the IO.Stream.Read function must:
// (a) throw an exception if offset & count reference an invalid part of the buffer,
// or if count < 0, or if buffer is null
// (b) return 0 only upon EOF, or if count = 0
// (c) if not EOF, then return at least 1 byte, up to <count> bytes
if (_streamMode == StreamMode.Undefined)
{
if (!this._stream.CanRead) throw new ZlibException("The stream is not readable.");
// for the first read, set up some controls.
_streamMode = StreamMode.Reader;
// (The first reference to _z goes through the private accessor which
// may initialize it.)
z.AvailableBytesIn = 0;
if (_flavor == ZlibStreamFlavor.GZIP)
{
_gzipHeaderByteCount = _ReadAndValidateGzipHeader();
// workitem 8501: handle edge case (decompress empty stream)
if (_gzipHeaderByteCount == 0)
return 0;
}
}
if (_streamMode != StreamMode.Reader)
throw new ZlibException("Cannot Read after Writing.");
if (count == 0) return 0;
if (nomoreinput && _wantCompress) return 0; // workitem 8557
if (buffer == null) throw new ArgumentNullException("buffer");
if (count < 0) throw new ArgumentOutOfRangeException("count");
if (offset < buffer.GetLowerBound(0)) throw new ArgumentOutOfRangeException("offset");
if ((offset + count) > buffer.GetLength(0)) throw new ArgumentOutOfRangeException("count");
int rc = 0;
// set up the output of the deflate/inflate codec:
_z.OutputBuffer = buffer;
_z.NextOut = offset;
_z.AvailableBytesOut = count;
// This is necessary in case _workingBuffer has been resized. (new byte[])
// (The first reference to _workingBuffer goes through the private accessor which
// may initialize it.)
_z.InputBuffer = workingBuffer;
do
{
// need data in _workingBuffer in order to deflate/inflate. Here, we check if we have any.
if ((_z.AvailableBytesIn == 0) && (!nomoreinput))
{
// No data available, so try to Read data from the captive stream.
_z.NextIn = 0;
_z.AvailableBytesIn = _stream.Read(_workingBuffer, 0, _workingBuffer.Length);
if (_z.AvailableBytesIn == 0)
nomoreinput = true;
}
// we have data in InputBuffer; now compress or decompress as appropriate
rc = (_wantCompress)
? _z.Deflate(_flushMode)
: _z.Inflate(_flushMode);
if (nomoreinput && (rc == ZlibConstants.Z_BUF_ERROR))
return 0;
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
throw new ZlibException(String.Format("{0}flating: rc={1} msg={2}", (_wantCompress ? "de" : "in"), rc, _z.Message));
if ((nomoreinput || rc == ZlibConstants.Z_STREAM_END) && (_z.AvailableBytesOut == count))
break; // nothing more to read
}
//while (_z.AvailableBytesOut == count && rc == ZlibConstants.Z_OK);
while (_z.AvailableBytesOut > 0 && !nomoreinput && rc == ZlibConstants.Z_OK);
// workitem 8557
// is there more room in output?
if (_z.AvailableBytesOut > 0)
{
if (rc == ZlibConstants.Z_OK && _z.AvailableBytesIn == 0)
{
// deferred
}
// are we completely done reading?
if (nomoreinput)
{
// and in compression?
if (_wantCompress)
{
// no more input data available; therefore we flush to
// try to complete the read
rc = _z.Deflate(FlushType.Finish);
if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END)
throw new ZlibException(String.Format("Deflating: rc={0} msg={1}", rc, _z.Message));
}
}
}
rc = (count - _z.AvailableBytesOut);
// calculate CRC after reading
if (crc != null)
crc.SlurpBlock(buffer, offset, rc);
return rc;
}
public override System.Boolean CanRead
{
get { return this._stream.CanRead; }
}
public override System.Boolean CanSeek
{
get { return this._stream.CanSeek; }
}
public override System.Boolean CanWrite
{
get { return this._stream.CanWrite; }
}
public override System.Int64 Length
{
get { return _stream.Length; }
}
public override long Position
{
get { throw new NotImplementedException(); }
set { throw new NotImplementedException(); }
}
internal enum StreamMode
{
Writer,
Reader,
Undefined,
}
}
}

10
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serializedVersion: 2
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executionOrder: 0
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// ZlibCodec.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2009-November-03 15:40:51>
//
// ------------------------------------------------------------------
//
// This module defines a Codec for ZLIB compression and
// decompression. This code extends code that was based the jzlib
// implementation of zlib, but this code is completely novel. The codec
// class is new, and encapsulates some behaviors that are new, and some
// that were present in other classes in the jzlib code base. In
// keeping with the license for jzlib, the copyright to the jzlib code
// is included below.
//
// ------------------------------------------------------------------
//
// Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the distribution.
//
// 3. The names of the authors may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
// INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------
//
// This program is based on zlib-1.1.3; credit to authors
// Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
// and contributors of zlib.
//
// -----------------------------------------------------------------------
using System;
using Interop=System.Runtime.InteropServices;
namespace BestHTTP.Decompression.Zlib
{
/// <summary>
/// Encoder and Decoder for ZLIB and DEFLATE (IETF RFC1950 and RFC1951).
/// </summary>
///
/// <remarks>
/// This class compresses and decompresses data according to the Deflate algorithm
/// and optionally, the ZLIB format, as documented in <see
/// href="http://www.ietf.org/rfc/rfc1950.txt">RFC 1950 - ZLIB</see> and <see
/// href="http://www.ietf.org/rfc/rfc1951.txt">RFC 1951 - DEFLATE</see>.
/// </remarks>
sealed internal class ZlibCodec
{
/// <summary>
/// The buffer from which data is taken.
/// </summary>
public byte[] InputBuffer;
/// <summary>
/// An index into the InputBuffer array, indicating where to start reading.
/// </summary>
public int NextIn;
/// <summary>
/// The number of bytes available in the InputBuffer, starting at NextIn.
/// </summary>
/// <remarks>
/// Generally you should set this to InputBuffer.Length before the first Inflate() or Deflate() call.
/// The class will update this number as calls to Inflate/Deflate are made.
/// </remarks>
public int AvailableBytesIn;
/// <summary>
/// Total number of bytes read so far, through all calls to Inflate()/Deflate().
/// </summary>
public long TotalBytesIn;
/// <summary>
/// Buffer to store output data.
/// </summary>
public byte[] OutputBuffer;
/// <summary>
/// An index into the OutputBuffer array, indicating where to start writing.
/// </summary>
public int NextOut;
/// <summary>
/// The number of bytes available in the OutputBuffer, starting at NextOut.
/// </summary>
/// <remarks>
/// Generally you should set this to OutputBuffer.Length before the first Inflate() or Deflate() call.
/// The class will update this number as calls to Inflate/Deflate are made.
/// </remarks>
public int AvailableBytesOut;
/// <summary>
/// Total number of bytes written to the output so far, through all calls to Inflate()/Deflate().
/// </summary>
public long TotalBytesOut;
/// <summary>
/// used for diagnostics, when something goes wrong!
/// </summary>
public System.String Message;
internal DeflateManager dstate;
internal InflateManager istate;
internal uint _Adler32;
/// <summary>
/// The compression level to use in this codec. Useful only in compression mode.
/// </summary>
public CompressionLevel CompressLevel = CompressionLevel.Default;
/// <summary>
/// The number of Window Bits to use.
/// </summary>
/// <remarks>
/// This gauges the size of the sliding window, and hence the
/// compression effectiveness as well as memory consumption. It's best to just leave this
/// setting alone if you don't know what it is. The maximum value is 15 bits, which implies
/// a 32k window.
/// </remarks>
public int WindowBits = ZlibConstants.WindowBitsDefault;
/// <summary>
/// The compression strategy to use.
/// </summary>
/// <remarks>
/// This is only effective in compression. The theory offered by ZLIB is that different
/// strategies could potentially produce significant differences in compression behavior
/// for different data sets. Unfortunately I don't have any good recommendations for how
/// to set it differently. When I tested changing the strategy I got minimally different
/// compression performance. It's best to leave this property alone if you don't have a
/// good feel for it. Or, you may want to produce a test harness that runs through the
/// different strategy options and evaluates them on different file types. If you do that,
/// let me know your results.
/// </remarks>
public CompressionStrategy Strategy = CompressionStrategy.Default;
/// <summary>
/// The Adler32 checksum on the data transferred through the codec so far. You probably don't need to look at this.
/// </summary>
public int Adler32 { get { return (int)_Adler32; } }
/// <summary>
/// Create a ZlibCodec.
/// </summary>
/// <remarks>
/// If you use this default constructor, you will later have to explicitly call
/// InitializeInflate() or InitializeDeflate() before using the ZlibCodec to compress
/// or decompress.
/// </remarks>
public ZlibCodec() { }
/// <summary>
/// Create a ZlibCodec that either compresses or decompresses.
/// </summary>
/// <param name="mode">
/// Indicates whether the codec should compress (deflate) or decompress (inflate).
/// </param>
public ZlibCodec(CompressionMode mode)
{
if (mode == CompressionMode.Compress)
{
int rc = InitializeDeflate();
if (rc != ZlibConstants.Z_OK) throw new ZlibException("Cannot initialize for deflate.");
}
else if (mode == CompressionMode.Decompress)
{
int rc = InitializeInflate();
if (rc != ZlibConstants.Z_OK) throw new ZlibException("Cannot initialize for inflate.");
}
else throw new ZlibException("Invalid ZlibStreamFlavor.");
}
/// <summary>
/// Initialize the inflation state.
/// </summary>
/// <remarks>
/// It is not necessary to call this before using the ZlibCodec to inflate data;
/// It is implicitly called when you call the constructor.
/// </remarks>
/// <returns>Z_OK if everything goes well.</returns>
public int InitializeInflate()
{
return InitializeInflate(this.WindowBits);
}
/// <summary>
/// Initialize the inflation state with an explicit flag to
/// govern the handling of RFC1950 header bytes.
/// </summary>
///
/// <remarks>
/// By default, the ZLIB header defined in <see
/// href="http://www.ietf.org/rfc/rfc1950.txt">RFC 1950</see> is expected. If
/// you want to read a zlib stream you should specify true for
/// expectRfc1950Header. If you have a deflate stream, you will want to specify
/// false. It is only necessary to invoke this initializer explicitly if you
/// want to specify false.
/// </remarks>
///
/// <param name="expectRfc1950Header">whether to expect an RFC1950 header byte
/// pair when reading the stream of data to be inflated.</param>
///
/// <returns>Z_OK if everything goes well.</returns>
public int InitializeInflate(bool expectRfc1950Header)
{
return InitializeInflate(this.WindowBits, expectRfc1950Header);
}
/// <summary>
/// Initialize the ZlibCodec for inflation, with the specified number of window bits.
/// </summary>
/// <param name="windowBits">The number of window bits to use. If you need to ask what that is,
/// then you shouldn't be calling this initializer.</param>
/// <returns>Z_OK if all goes well.</returns>
public int InitializeInflate(int windowBits)
{
this.WindowBits = windowBits;
return InitializeInflate(windowBits, true);
}
/// <summary>
/// Initialize the inflation state with an explicit flag to govern the handling of
/// RFC1950 header bytes.
/// </summary>
///
/// <remarks>
/// If you want to read a zlib stream you should specify true for
/// expectRfc1950Header. In this case, the library will expect to find a ZLIB
/// header, as defined in <see href="http://www.ietf.org/rfc/rfc1950.txt">RFC
/// 1950</see>, in the compressed stream. If you will be reading a DEFLATE or
/// GZIP stream, which does not have such a header, you will want to specify
/// false.
/// </remarks>
///
/// <param name="expectRfc1950Header">whether to expect an RFC1950 header byte pair when reading
/// the stream of data to be inflated.</param>
/// <param name="windowBits">The number of window bits to use. If you need to ask what that is,
/// then you shouldn't be calling this initializer.</param>
/// <returns>Z_OK if everything goes well.</returns>
public int InitializeInflate(int windowBits, bool expectRfc1950Header)
{
this.WindowBits = windowBits;
if (dstate != null) throw new ZlibException("You may not call InitializeInflate() after calling InitializeDeflate().");
istate = new InflateManager(expectRfc1950Header);
return istate.Initialize(this, windowBits);
}
/// <summary>
/// Inflate the data in the InputBuffer, placing the result in the OutputBuffer.
/// </summary>
/// <remarks>
/// You must have set InputBuffer and OutputBuffer, NextIn and NextOut, and AvailableBytesIn and
/// AvailableBytesOut before calling this method.
/// </remarks>
/// <example>
/// <code>
/// private void InflateBuffer()
/// {
/// int bufferSize = 1024;
/// byte[] buffer = new byte[bufferSize];
/// ZlibCodec decompressor = new ZlibCodec();
///
/// Console.WriteLine("\n============================================");
/// Console.WriteLine("Size of Buffer to Inflate: {0} bytes.", CompressedBytes.Length);
/// MemoryStream ms = new MemoryStream(DecompressedBytes);
///
/// int rc = decompressor.InitializeInflate();
///
/// decompressor.InputBuffer = CompressedBytes;
/// decompressor.NextIn = 0;
/// decompressor.AvailableBytesIn = CompressedBytes.Length;
///
/// decompressor.OutputBuffer = buffer;
///
/// // pass 1: inflate
/// do
/// {
/// decompressor.NextOut = 0;
/// decompressor.AvailableBytesOut = buffer.Length;
/// rc = decompressor.Inflate(FlushType.None);
///
/// if (rc != ZlibConstants.Z_OK &amp;&amp; rc != ZlibConstants.Z_STREAM_END)
/// throw new Exception("inflating: " + decompressor.Message);
///
/// ms.Write(decompressor.OutputBuffer, 0, buffer.Length - decompressor.AvailableBytesOut);
/// }
/// while (decompressor.AvailableBytesIn &gt; 0 || decompressor.AvailableBytesOut == 0);
///
/// // pass 2: finish and flush
/// do
/// {
/// decompressor.NextOut = 0;
/// decompressor.AvailableBytesOut = buffer.Length;
/// rc = decompressor.Inflate(FlushType.Finish);
///
/// if (rc != ZlibConstants.Z_STREAM_END &amp;&amp; rc != ZlibConstants.Z_OK)
/// throw new Exception("inflating: " + decompressor.Message);
///
/// if (buffer.Length - decompressor.AvailableBytesOut &gt; 0)
/// ms.Write(buffer, 0, buffer.Length - decompressor.AvailableBytesOut);
/// }
/// while (decompressor.AvailableBytesIn &gt; 0 || decompressor.AvailableBytesOut == 0);
///
/// decompressor.EndInflate();
/// }
///
/// </code>
/// </example>
/// <param name="flush">The flush to use when inflating.</param>
/// <returns>Z_OK if everything goes well.</returns>
public int Inflate(FlushType flush)
{
if (istate == null)
throw new ZlibException("No Inflate State!");
return istate.Inflate(flush);
}
/// <summary>
/// Ends an inflation session.
/// </summary>
/// <remarks>
/// Call this after successively calling Inflate(). This will cause all buffers to be flushed.
/// After calling this you cannot call Inflate() without a intervening call to one of the
/// InitializeInflate() overloads.
/// </remarks>
/// <returns>Z_OK if everything goes well.</returns>
public int EndInflate()
{
if (istate == null)
throw new ZlibException("No Inflate State!");
int ret = istate.End();
istate = null;
return ret;
}
/// <summary>
/// I don't know what this does!
/// </summary>
/// <returns>Z_OK if everything goes well.</returns>
public int SyncInflate()
{
if (istate == null)
throw new ZlibException("No Inflate State!");
return istate.Sync();
}
/// <summary>
/// Initialize the ZlibCodec for deflation operation.
/// </summary>
/// <remarks>
/// The codec will use the MAX window bits and the default level of compression.
/// </remarks>
/// <example>
/// <code>
/// int bufferSize = 40000;
/// byte[] CompressedBytes = new byte[bufferSize];
/// byte[] DecompressedBytes = new byte[bufferSize];
///
/// ZlibCodec compressor = new ZlibCodec();
///
/// compressor.InitializeDeflate(CompressionLevel.Default);
///
/// compressor.InputBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress);
/// compressor.NextIn = 0;
/// compressor.AvailableBytesIn = compressor.InputBuffer.Length;
///
/// compressor.OutputBuffer = CompressedBytes;
/// compressor.NextOut = 0;
/// compressor.AvailableBytesOut = CompressedBytes.Length;
///
/// while (compressor.TotalBytesIn != TextToCompress.Length &amp;&amp; compressor.TotalBytesOut &lt; bufferSize)
/// {
/// compressor.Deflate(FlushType.None);
/// }
///
/// while (true)
/// {
/// int rc= compressor.Deflate(FlushType.Finish);
/// if (rc == ZlibConstants.Z_STREAM_END) break;
/// }
///
/// compressor.EndDeflate();
///
/// </code>
/// </example>
/// <returns>Z_OK if all goes well. You generally don't need to check the return code.</returns>
public int InitializeDeflate()
{
return _InternalInitializeDeflate(true);
}
/// <summary>
/// Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel.
/// </summary>
/// <remarks>
/// The codec will use the maximum window bits (15) and the specified
/// CompressionLevel. It will emit a ZLIB stream as it compresses.
/// </remarks>
/// <param name="level">The compression level for the codec.</param>
/// <returns>Z_OK if all goes well.</returns>
public int InitializeDeflate(CompressionLevel level)
{
this.CompressLevel = level;
return _InternalInitializeDeflate(true);
}
/// <summary>
/// Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel,
/// and the explicit flag governing whether to emit an RFC1950 header byte pair.
/// </summary>
/// <remarks>
/// The codec will use the maximum window bits (15) and the specified CompressionLevel.
/// If you want to generate a zlib stream, you should specify true for
/// wantRfc1950Header. In this case, the library will emit a ZLIB
/// header, as defined in <see href="http://www.ietf.org/rfc/rfc1950.txt">RFC
/// 1950</see>, in the compressed stream.
/// </remarks>
/// <param name="level">The compression level for the codec.</param>
/// <param name="wantRfc1950Header">whether to emit an initial RFC1950 byte pair in the compressed stream.</param>
/// <returns>Z_OK if all goes well.</returns>
public int InitializeDeflate(CompressionLevel level, bool wantRfc1950Header)
{
this.CompressLevel = level;
return _InternalInitializeDeflate(wantRfc1950Header);
}
/// <summary>
/// Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel,
/// and the specified number of window bits.
/// </summary>
/// <remarks>
/// The codec will use the specified number of window bits and the specified CompressionLevel.
/// </remarks>
/// <param name="level">The compression level for the codec.</param>
/// <param name="bits">the number of window bits to use. If you don't know what this means, don't use this method.</param>
/// <returns>Z_OK if all goes well.</returns>
public int InitializeDeflate(CompressionLevel level, int bits)
{
this.CompressLevel = level;
this.WindowBits = bits;
return _InternalInitializeDeflate(true);
}
/// <summary>
/// Initialize the ZlibCodec for deflation operation, using the specified
/// CompressionLevel, the specified number of window bits, and the explicit flag
/// governing whether to emit an RFC1950 header byte pair.
/// </summary>
///
/// <param name="level">The compression level for the codec.</param>
/// <param name="wantRfc1950Header">whether to emit an initial RFC1950 byte pair in the compressed stream.</param>
/// <param name="bits">the number of window bits to use. If you don't know what this means, don't use this method.</param>
/// <returns>Z_OK if all goes well.</returns>
public int InitializeDeflate(CompressionLevel level, int bits, bool wantRfc1950Header)
{
this.CompressLevel = level;
this.WindowBits = bits;
return _InternalInitializeDeflate(wantRfc1950Header);
}
private int _InternalInitializeDeflate(bool wantRfc1950Header)
{
if (istate != null) throw new ZlibException("You may not call InitializeDeflate() after calling InitializeInflate().");
dstate = new DeflateManager();
dstate.WantRfc1950HeaderBytes = wantRfc1950Header;
return dstate.Initialize(this, this.CompressLevel, this.WindowBits, this.Strategy);
}
/// <summary>
/// Deflate one batch of data.
/// </summary>
/// <remarks>
/// You must have set InputBuffer and OutputBuffer before calling this method.
/// </remarks>
/// <example>
/// <code>
/// private void DeflateBuffer(CompressionLevel level)
/// {
/// int bufferSize = 1024;
/// byte[] buffer = new byte[bufferSize];
/// ZlibCodec compressor = new ZlibCodec();
///
/// Console.WriteLine("\n============================================");
/// Console.WriteLine("Size of Buffer to Deflate: {0} bytes.", UncompressedBytes.Length);
/// MemoryStream ms = new MemoryStream();
///
/// int rc = compressor.InitializeDeflate(level);
///
/// compressor.InputBuffer = UncompressedBytes;
/// compressor.NextIn = 0;
/// compressor.AvailableBytesIn = UncompressedBytes.Length;
///
/// compressor.OutputBuffer = buffer;
///
/// // pass 1: deflate
/// do
/// {
/// compressor.NextOut = 0;
/// compressor.AvailableBytesOut = buffer.Length;
/// rc = compressor.Deflate(FlushType.None);
///
/// if (rc != ZlibConstants.Z_OK &amp;&amp; rc != ZlibConstants.Z_STREAM_END)
/// throw new Exception("deflating: " + compressor.Message);
///
/// ms.Write(compressor.OutputBuffer, 0, buffer.Length - compressor.AvailableBytesOut);
/// }
/// while (compressor.AvailableBytesIn &gt; 0 || compressor.AvailableBytesOut == 0);
///
/// // pass 2: finish and flush
/// do
/// {
/// compressor.NextOut = 0;
/// compressor.AvailableBytesOut = buffer.Length;
/// rc = compressor.Deflate(FlushType.Finish);
///
/// if (rc != ZlibConstants.Z_STREAM_END &amp;&amp; rc != ZlibConstants.Z_OK)
/// throw new Exception("deflating: " + compressor.Message);
///
/// if (buffer.Length - compressor.AvailableBytesOut &gt; 0)
/// ms.Write(buffer, 0, buffer.Length - compressor.AvailableBytesOut);
/// }
/// while (compressor.AvailableBytesIn &gt; 0 || compressor.AvailableBytesOut == 0);
///
/// compressor.EndDeflate();
///
/// ms.Seek(0, SeekOrigin.Begin);
/// CompressedBytes = new byte[compressor.TotalBytesOut];
/// ms.Read(CompressedBytes, 0, CompressedBytes.Length);
/// }
/// </code>
/// </example>
/// <param name="flush">whether to flush all data as you deflate. Generally you will want to
/// use Z_NO_FLUSH here, in a series of calls to Deflate(), and then call EndDeflate() to
/// flush everything.
/// </param>
/// <returns>Z_OK if all goes well.</returns>
public int Deflate(FlushType flush)
{
if (dstate == null)
throw new ZlibException("No Deflate State!");
return dstate.Deflate(flush);
}
/// <summary>
/// End a deflation session.
/// </summary>
/// <remarks>
/// Call this after making a series of one or more calls to Deflate(). All buffers are flushed.
/// </remarks>
/// <returns>Z_OK if all goes well.</returns>
public int EndDeflate()
{
if (dstate == null)
throw new ZlibException("No Deflate State!");
// Room for improvement: dinoch Tue, 03 Nov 2009 15:39 (test this)
//int ret = dstate.End();
dstate = null;
return ZlibConstants.Z_OK; //ret;
}
/// <summary>
/// Reset a codec for another deflation session.
/// </summary>
/// <remarks>
/// Call this to reset the deflation state. For example if a thread is deflating
/// non-consecutive blocks, you can call Reset() after the Deflate(Sync) of the first
/// block and before the next Deflate(None) of the second block.
/// </remarks>
/// <returns>Z_OK if all goes well.</returns>
public void ResetDeflate()
{
if (dstate == null)
throw new ZlibException("No Deflate State!");
dstate.Reset();
}
/// <summary>
/// Set the CompressionStrategy and CompressionLevel for a deflation session.
/// </summary>
/// <param name="level">the level of compression to use.</param>
/// <param name="strategy">the strategy to use for compression.</param>
/// <returns>Z_OK if all goes well.</returns>
public int SetDeflateParams(CompressionLevel level, CompressionStrategy strategy)
{
if (dstate == null)
throw new ZlibException("No Deflate State!");
return dstate.SetParams(level, strategy);
}
/// <summary>
/// Set the dictionary to be used for either Inflation or Deflation.
/// </summary>
/// <param name="dictionary">The dictionary bytes to use.</param>
/// <returns>Z_OK if all goes well.</returns>
public int SetDictionary(byte[] dictionary)
{
if (istate != null)
return istate.SetDictionary(dictionary);
if (dstate != null)
return dstate.SetDictionary(dictionary);
throw new ZlibException("No Inflate or Deflate state!");
}
// Flush as much pending output as possible. All deflate() output goes
// through this function so some applications may wish to modify it
// to avoid allocating a large strm->next_out buffer and copying into it.
// (See also read_buf()).
internal void flush_pending()
{
int len = dstate.pendingCount;
if (len > AvailableBytesOut)
len = AvailableBytesOut;
if (len == 0)
return;
if (dstate.pending.Length <= dstate.nextPending ||
OutputBuffer.Length <= NextOut ||
dstate.pending.Length < (dstate.nextPending + len) ||
OutputBuffer.Length < (NextOut + len))
{
throw new ZlibException(String.Format("Invalid State. (pending.Length={0}, pendingCount={1})",
dstate.pending.Length, dstate.pendingCount));
}
Array.Copy(dstate.pending, dstate.nextPending, OutputBuffer, NextOut, len);
NextOut += len;
dstate.nextPending += len;
TotalBytesOut += len;
AvailableBytesOut -= len;
dstate.pendingCount -= len;
if (dstate.pendingCount == 0)
{
dstate.nextPending = 0;
}
}
// Read a new buffer from the current input stream, update the adler32
// and total number of bytes read. All deflate() input goes through
// this function so some applications may wish to modify it to avoid
// allocating a large strm->next_in buffer and copying from it.
// (See also flush_pending()).
internal int read_buf(byte[] buf, int start, int size)
{
int len = AvailableBytesIn;
if (len > size)
len = size;
if (len == 0)
return 0;
AvailableBytesIn -= len;
if (dstate.WantRfc1950HeaderBytes)
{
_Adler32 = Adler.Adler32(_Adler32, InputBuffer, NextIn, len);
}
Array.Copy(InputBuffer, NextIn, buf, start, len);
NextIn += len;
TotalBytesIn += len;
return len;
}
}
}

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// ZlibConstants.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa and Microsoft Corporation.
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2009-November-03 18:50:19>
//
// ------------------------------------------------------------------
//
// This module defines constants used by the zlib class library. This
// code is derived from the jzlib implementation of zlib, but
// significantly modified. In keeping with the license for jzlib, the
// copyright to that code is included here.
//
// ------------------------------------------------------------------
//
// Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the distribution.
//
// 3. The names of the authors may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
// INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
// OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
// EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------
//
// This program is based on zlib-1.1.3; credit to authors
// Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
// and contributors of zlib.
//
// -----------------------------------------------------------------------
using System;
namespace BestHTTP.Decompression.Zlib
{
/// <summary>
/// A bunch of constants used in the Zlib interface.
/// </summary>
public static class ZlibConstants
{
/// <summary>
/// The maximum number of window bits for the Deflate algorithm.
/// </summary>
public const int WindowBitsMax = 15; // 32K LZ77 window
/// <summary>
/// The default number of window bits for the Deflate algorithm.
/// </summary>
public const int WindowBitsDefault = WindowBitsMax;
/// <summary>
/// indicates everything is A-OK
/// </summary>
public const int Z_OK = 0;
/// <summary>
/// Indicates that the last operation reached the end of the stream.
/// </summary>
public const int Z_STREAM_END = 1;
/// <summary>
/// The operation ended in need of a dictionary.
/// </summary>
public const int Z_NEED_DICT = 2;
/// <summary>
/// There was an error with the stream - not enough data, not open and readable, etc.
/// </summary>
public const int Z_STREAM_ERROR = -2;
/// <summary>
/// There was an error with the data - not enough data, bad data, etc.
/// </summary>
public const int Z_DATA_ERROR = -3;
/// <summary>
/// There was an error with the working buffer.
/// </summary>
public const int Z_BUF_ERROR = -5;
/// <summary>
/// The size of the working buffer used in the ZlibCodec class. Defaults to 8192 bytes.
/// </summary>
#if NETCF
public const int WorkingBufferSizeDefault = 8192;
#else
public const int WorkingBufferSizeDefault = 16384;
#endif
/// <summary>
/// The minimum size of the working buffer used in the ZlibCodec class. Currently it is 128 bytes.
/// </summary>
public const int WorkingBufferSizeMin = 1024;
}
}

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