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v3.0.0-v2.4.13
cocos-enhance-kit/engine/cocos2d/compression/gzip.js
SmallMain ef0589e8e5 初始化
2022-06-25 00:23:03 +08:00

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/*--
Copyright 2009-2010 by Stefan Rusterholz.
All rights reserved.
You can choose between MIT and BSD-3-Clause license. License file will be added later.
--*/
/**
* See cc.Codec.GZip.gunzip.
* @param {Array | String} data The bytestream to decompress
* Constructor
*/
var GZip = function Jacob__GZip(data) {
this.data = data;
this.debug = false;
this.gpflags = undefined;
this.files = 0;
this.unzipped = [];
this.buf32k = new Array(32768);
this.bIdx = 0;
this.modeZIP = false;
this.bytepos = 0;
this.bb = 1;
this.bits = 0;
this.nameBuf = [];
this.fileout = undefined;
this.literalTree = new Array(GZip.LITERALS);
this.distanceTree = new Array(32);
this.treepos = 0;
this.Places = null;
this.len = 0;
this.fpos = new Array(17);
this.fpos[0] = 0;
this.flens = undefined;
this.fmax = undefined;
};
/**
* Unzips the gzipped data of the 'data' argument.
* @param string The bytestream to decompress. Either an array of Integers between 0 and 255, or a String.
* @return {String}
*/
GZip.gunzip = function (string) {
if (string.constructor === Array) {
} else if (string.constructor === String) {
}
var gzip = new GZip(string);
return gzip.gunzip()[0][0];
};
GZip.HufNode = function () {
this.b0 = 0;
this.b1 = 0;
this.jump = null;
this.jumppos = -1;
};
/**
* @constant
* @type Number
*/
GZip.LITERALS = 288;
/**
* @constant
* @type Number
*/
GZip.NAMEMAX = 256;
GZip.bitReverse = [
0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
];
GZip.cplens = [
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
];
GZip.cplext = [
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, 99, 99
];
/* 99==invalid */
GZip.cpdist = [
0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0007, 0x0009, 0x000d,
0x0011, 0x0019, 0x0021, 0x0031, 0x0041, 0x0061, 0x0081, 0x00c1,
0x0101, 0x0181, 0x0201, 0x0301, 0x0401, 0x0601, 0x0801, 0x0c01,
0x1001, 0x1801, 0x2001, 0x3001, 0x4001, 0x6001
];
GZip.cpdext = [
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
];
GZip.border = [16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15];
/**
* gunzip
* @return {Array}
*/
GZip.prototype.gunzip = function () {
this.outputArr = [];
//convertToByteArray(input);
//if (this.debug) alert(this.data);
this.nextFile();
return this.unzipped;
};
GZip.prototype.readByte = function () {
this.bits += 8;
if (this.bytepos < this.data.length) {
//return this.data[this.bytepos++]; // Array
return this.data.charCodeAt(this.bytepos++);
} else {
return -1;
}
};
GZip.prototype.byteAlign = function () {
this.bb = 1;
};
GZip.prototype.readBit = function () {
var carry;
this.bits++;
carry = (this.bb & 1);
this.bb >>= 1;
if (this.bb === 0) {
this.bb = this.readByte();
carry = (this.bb & 1);
this.bb = (this.bb >> 1) | 0x80;
}
return carry;
};
GZip.prototype.readBits = function (a) {
var res = 0,
i = a;
while (i--) res = (res << 1) | this.readBit();
if (a) res = GZip.bitReverse[res] >> (8 - a);
return res;
};
GZip.prototype.flushBuffer = function () {
this.bIdx = 0;
};
GZip.prototype.addBuffer = function (a) {
this.buf32k[this.bIdx++] = a;
this.outputArr.push(String.fromCharCode(a));
if (this.bIdx === 0x8000) this.bIdx = 0;
};
GZip.prototype.IsPat = function () {
while (1) {
if (this.fpos[this.len] >= this.fmax) return -1;
if (this.flens[this.fpos[this.len]] === this.len) return this.fpos[this.len]++;
this.fpos[this.len]++;
}
};
GZip.prototype.Rec = function () {
var curplace = this.Places[this.treepos];
var tmp;
//if (this.debug) document.write("<br>len:"+this.len+" treepos:"+this.treepos);
if (this.len === 17) { //war 17
return -1;
}
this.treepos++;
this.len++;
tmp = this.IsPat();
//if (this.debug) document.write("<br>IsPat "+tmp);
if (tmp >= 0) {
curplace.b0 = tmp;
/* leaf cell for 0-bit */
//if (this.debug) document.write("<br>b0 "+curplace.b0);
} else {
/* Not a Leaf cell */
curplace.b0 = 0x8000;
//if (this.debug) document.write("<br>b0 "+curplace.b0);
if (this.Rec()) return -1;
}
tmp = this.IsPat();
if (tmp >= 0) {
curplace.b1 = tmp;
/* leaf cell for 1-bit */
//if (this.debug) document.write("<br>b1 "+curplace.b1);
curplace.jump = null;
/* Just for the display routine */
} else {
/* Not a Leaf cell */
curplace.b1 = 0x8000;
//if (this.debug) document.write("<br>b1 "+curplace.b1);
curplace.jump = this.Places[this.treepos];
curplace.jumppos = this.treepos;
if (this.Rec()) return -1;
}
this.len--;
return 0;
};
GZip.prototype.CreateTree = function (currentTree, numval, lengths, show) {
var i;
/* Create the Huffman decode tree/table */
//if (this.debug) document.write("currentTree "+currentTree+" numval "+numval+" lengths "+lengths+" show "+show);
this.Places = currentTree;
this.treepos = 0;
this.flens = lengths;
this.fmax = numval;
for (i = 0; i < 17; i++) this.fpos[i] = 0;
this.len = 0;
if (this.Rec()) {
//if (this.debug) alert("invalid huffman tree\n");
return -1;
}
// if (this.debug) {
// document.write('<br>Tree: '+this.Places.length);
// for (var a=0;a<32;a++){
// document.write("Places["+a+"].b0="+this.Places[a].b0+"<br>");
// document.write("Places["+a+"].b1="+this.Places[a].b1+"<br>");
// }
// }
return 0;
};
GZip.prototype.DecodeValue = function (currentTree) {
var len, i,
xtreepos = 0,
X = currentTree[xtreepos],
b;
/* decode one symbol of the data */
while (1) {
b = this.readBit();
// if (this.debug) document.write("b="+b);
if (b) {
if (!(X.b1 & 0x8000)) {
// if (this.debug) document.write("ret1");
return X.b1;
/* If leaf node, return data */
}
X = X.jump;
len = currentTree.length;
for (i = 0; i < len; i++) {
if (currentTree[i] === X) {
xtreepos = i;
break;
}
}
} else {
if (!(X.b0 & 0x8000)) {
// if (this.debug) document.write("ret2");
return X.b0;
/* If leaf node, return data */
}
xtreepos++;
X = currentTree[xtreepos];
}
}
// if (this.debug) document.write("ret3");
return -1;
};
GZip.prototype.DeflateLoop = function () {
var last, c, type, i, len;
do {
last = this.readBit();
type = this.readBits(2);
if (type === 0) {
var blockLen, cSum;
// Stored
this.byteAlign();
blockLen = this.readByte();
blockLen |= (this.readByte() << 8);
cSum = this.readByte();
cSum |= (this.readByte() << 8);
if (((blockLen ^ ~cSum) & 0xffff)) {
document.write("BlockLen checksum mismatch\n"); // FIXME: use throw
}
while (blockLen--) {
c = this.readByte();
this.addBuffer(c);
}
} else if (type === 1) {
var j;
/* Fixed Huffman tables -- fixed decode routine */
while (1) {
/*
256 0000000 0
: : :
279 0010111 23
0 00110000 48
: : :
143 10111111 191
280 11000000 192
: : :
287 11000111 199
144 110010000 400
: : :
255 111111111 511
Note the bit order!
*/
j = (GZip.bitReverse[this.readBits(7)] >> 1);
if (j > 23) {
j = (j << 1) | this.readBit();
/* 48..255 */
if (j > 199) { /* 200..255 */
j -= 128;
/* 72..127 */
j = (j << 1) | this.readBit();
/* 144..255 << */
} else { /* 48..199 */
j -= 48;
/* 0..151 */
if (j > 143) {
j = j + 136;
/* 280..287 << */
/* 0..143 << */
}
}
} else { /* 0..23 */
j += 256;
/* 256..279 << */
}
if (j < 256) {
this.addBuffer(j);
} else if (j === 256) {
/* EOF */
break; // FIXME: make this the loop-condition
} else {
var len, dist;
j -= 256 + 1;
/* bytes + EOF */
len = this.readBits(GZip.cplext[j]) + GZip.cplens[j];
j = GZip.bitReverse[this.readBits(5)] >> 3;
if (GZip.cpdext[j] > 8) {
dist = this.readBits(8);
dist |= (this.readBits(GZip.cpdext[j] - 8) << 8);
} else {
dist = this.readBits(GZip.cpdext[j]);
}
dist += GZip.cpdist[j];
for (j = 0; j < len; j++) {
var c = this.buf32k[(this.bIdx - dist) & 0x7fff];
this.addBuffer(c);
}
}
} // while
} else if (type === 2) {
var j, n, literalCodes, distCodes, lenCodes;
var ll = new Array(288 + 32); // "static" just to preserve stack
// Dynamic Huffman tables
literalCodes = 257 + this.readBits(5);
distCodes = 1 + this.readBits(5);
lenCodes = 4 + this.readBits(4);
for (j = 0; j < 19; j++) {
ll[j] = 0;
}
// Get the decode tree code lengths
for (j = 0; j < lenCodes; j++) {
ll[GZip.border[j]] = this.readBits(3);
}
len = this.distanceTree.length;
for (i = 0; i < len; i++) this.distanceTree[i] = new GZip.HufNode();
if (this.CreateTree(this.distanceTree, 19, ll, 0)) {
this.flushBuffer();
return 1;
}
// if (this.debug) {
// document.write("<br>distanceTree");
// for(var a=0;a<this.distanceTree.length;a++){
// document.write("<br>"+this.distanceTree[a].b0+" "+this.distanceTree[a].b1+" "+this.distanceTree[a].jump+" "+this.distanceTree[a].jumppos);
// }
// }
//read in literal and distance code lengths
n = literalCodes + distCodes;
i = 0;
var z = -1;
// if (this.debug) document.write("<br>n="+n+" bits: "+this.bits+"<br>");
while (i < n) {
z++;
j = this.DecodeValue(this.distanceTree);
// if (this.debug) document.write("<br>"+z+" i:"+i+" decode: "+j+" bits "+this.bits+"<br>");
if (j < 16) { // length of code in bits (0..15)
ll[i++] = j;
} else if (j === 16) { // repeat last length 3 to 6 times
var l;
j = 3 + this.readBits(2);
if (i + j > n) {
this.flushBuffer();
return 1;
}
l = i ? ll[i - 1] : 0;
while (j--) {
ll[i++] = l;
}
} else {
if (j === 17) { // 3 to 10 zero length codes
j = 3 + this.readBits(3);
} else { // j == 18: 11 to 138 zero length codes
j = 11 + this.readBits(7);
}
if (i + j > n) {
this.flushBuffer();
return 1;
}
while (j--) {
ll[i++] = 0;
}
}
} // while
// Can overwrite tree decode tree as it is not used anymore
len = this.literalTree.length;
for (i = 0; i < len; i++)
this.literalTree[i] = new GZip.HufNode();
if (this.CreateTree(this.literalTree, literalCodes, ll, 0)) {
this.flushBuffer();
return 1;
}
len = this.literalTree.length;
for (i = 0; i < len; i++) this.distanceTree[i] = new GZip.HufNode();
var ll2 = new Array();
for (i = literalCodes; i < ll.length; i++) ll2[i - literalCodes] = ll[i];
if (this.CreateTree(this.distanceTree, distCodes, ll2, 0)) {
this.flushBuffer();
return 1;
}
// if (this.debug) document.write("<br>literalTree");
while (1) {
j = this.DecodeValue(this.literalTree);
if (j >= 256) { // In C64: if carry set
var len, dist;
j -= 256;
if (j === 0) {
// EOF
break;
}
j--;
len = this.readBits(GZip.cplext[j]) + GZip.cplens[j];
j = this.DecodeValue(this.distanceTree);
if (GZip.cpdext[j] > 8) {
dist = this.readBits(8);
dist |= (this.readBits(GZip.cpdext[j] - 8) << 8);
} else {
dist = this.readBits(GZip.cpdext[j]);
}
dist += GZip.cpdist[j];
while (len--) {
var c = this.buf32k[(this.bIdx - dist) & 0x7fff];
this.addBuffer(c);
}
} else {
this.addBuffer(j);
}
} // while
}
} while (!last);
this.flushBuffer();
this.byteAlign();
return 0;
};
GZip.prototype.unzipFile = function (name) {
var i;
this.gunzip();
for (i = 0; i < this.unzipped.length; i++) {
if (this.unzipped[i][1] === name) {
return this.unzipped[i][0];
}
}
};
GZip.prototype.nextFile = function () {
// if (this.debug) alert("NEXTFILE");
this.outputArr = [];
this.modeZIP = false;
var tmp = [];
tmp[0] = this.readByte();
tmp[1] = this.readByte();
// if (this.debug) alert("type: "+tmp[0]+" "+tmp[1]);
if (tmp[0] === 0x78 && tmp[1] === 0xda) { //GZIP
// if (this.debug) alert("GEONExT-GZIP");
this.DeflateLoop();
// if (this.debug) alert(this.outputArr.join(''));
this.unzipped[this.files] = [this.outputArr.join(''), "geonext.gxt"];
this.files++;
}
if (tmp[0] === 0x1f && tmp[1] === 0x8b) { //GZIP
// if (this.debug) alert("GZIP");
this.skipdir();
// if (this.debug) alert(this.outputArr.join(''));
this.unzipped[this.files] = [this.outputArr.join(''), "file"];
this.files++;
}
if (tmp[0] === 0x50 && tmp[1] === 0x4b) { //ZIP
this.modeZIP = true;
tmp[2] = this.readByte();
tmp[3] = this.readByte();
if (tmp[2] === 0x03 && tmp[3] === 0x04) {
//MODE_ZIP
tmp[0] = this.readByte();
tmp[1] = this.readByte();
// if (this.debug) alert("ZIP-Version: "+tmp[1]+" "+tmp[0]/10+"."+tmp[0]%10);
this.gpflags = this.readByte();
this.gpflags |= (this.readByte() << 8);
// if (this.debug) alert("gpflags: "+this.gpflags);
var method = this.readByte();
method |= (this.readByte() << 8);
// if (this.debug) alert("method: "+method);
this.readByte();
this.readByte();
this.readByte();
this.readByte();
// var crc = this.readByte();
// crc |= (this.readByte()<<8);
// crc |= (this.readByte()<<16);
// crc |= (this.readByte()<<24);
var compSize = this.readByte();
compSize |= (this.readByte() << 8);
compSize |= (this.readByte() << 16);
compSize |= (this.readByte() << 24);
var size = this.readByte();
size |= (this.readByte() << 8);
size |= (this.readByte() << 16);
size |= (this.readByte() << 24);
// if (this.debug) alert("local CRC: "+crc+"\nlocal Size: "+size+"\nlocal CompSize: "+compSize);
var filelen = this.readByte();
filelen |= (this.readByte() << 8);
var extralen = this.readByte();
extralen |= (this.readByte() << 8);
// if (this.debug) alert("filelen "+filelen);
i = 0;
this.nameBuf = [];
while (filelen--) {
var c = this.readByte();
if (c === "/" | c === ":") {
i = 0;
} else if (i < GZip.NAMEMAX - 1) {
this.nameBuf[i++] = String.fromCharCode(c);
}
}
// if (this.debug) alert("nameBuf: "+this.nameBuf);
if (!this.fileout) this.fileout = this.nameBuf;
var i = 0;
while (i < extralen) {
c = this.readByte();
i++;
}
// if (size = 0 && this.fileOut.charAt(this.fileout.length-1)=="/"){
// //skipdir
// // if (this.debug) alert("skipdir");
// }
if (method === 8) {
this.DeflateLoop();
// if (this.debug) alert(this.outputArr.join(''));
this.unzipped[this.files] = [this.outputArr.join(''), this.nameBuf.join('')];
this.files++;
}
this.skipdir();
}
}
};
GZip.prototype.skipdir = function () {
var tmp = [];
var compSize, size, os, i, c;
if ((this.gpflags & 8)) {
tmp[0] = this.readByte();
tmp[1] = this.readByte();
tmp[2] = this.readByte();
tmp[3] = this.readByte();
// if (tmp[0] == 0x50 && tmp[1] == 0x4b && tmp[2] == 0x07 && tmp[3] == 0x08) {
// crc = this.readByte();
// crc |= (this.readByte()<<8);
// crc |= (this.readByte()<<16);
// crc |= (this.readByte()<<24);
// } else {
// crc = tmp[0] | (tmp[1]<<8) | (tmp[2]<<16) | (tmp[3]<<24);
// }
compSize = this.readByte();
compSize |= (this.readByte() << 8);
compSize |= (this.readByte() << 16);
compSize |= (this.readByte() << 24);
size = this.readByte();
size |= (this.readByte() << 8);
size |= (this.readByte() << 16);
size |= (this.readByte() << 24);
}
if (this.modeZIP) this.nextFile();
tmp[0] = this.readByte();
if (tmp[0] !== 8) {
// if (this.debug) alert("Unknown compression method!");
return 0;
}
this.gpflags = this.readByte();
// if (this.debug && (this.gpflags & ~(0x1f))) alert("Unknown flags set!");
this.readByte();
this.readByte();
this.readByte();
this.readByte();
this.readByte();
os = this.readByte();
if ((this.gpflags & 4)) {
tmp[0] = this.readByte();
tmp[2] = this.readByte();
this.len = tmp[0] + 256 * tmp[1];
// if (this.debug) alert("Extra field size: "+this.len);
for (i = 0; i < this.len; i++)
this.readByte();
}
if ((this.gpflags & 8)) {
i = 0;
this.nameBuf = [];
while (c = this.readByte()) {
if (c === "7" || c === ":")
i = 0;
if (i < GZip.NAMEMAX - 1)
this.nameBuf[i++] = c;
}
//this.nameBuf[i] = "\0";
// if (this.debug) alert("original file name: "+this.nameBuf);
}
if ((this.gpflags & 16)) {
while (c = this.readByte()) { // FIXME: looks like they read to the end of the stream, should be doable more efficiently
//FILE COMMENT
}
}
if ((this.gpflags & 2)) {
this.readByte();
this.readByte();
}
this.DeflateLoop();
// crc = this.readByte();
// crc |= (this.readByte()<<8);
// crc |= (this.readByte()<<16);
// crc |= (this.readByte()<<24);
size = this.readByte();
size |= (this.readByte() << 8);
size |= (this.readByte() << 16);
size |= (this.readByte() << 24);
if (this.modeZIP) this.nextFile();
};
module.exports = GZip;
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