86 lines
2.5 KiB
TypeScript
86 lines
2.5 KiB
TypeScript
export module Encoding.UTF8 {
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export function GetBytes(str: string) {
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let len = str.length, resPos = -1;
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let resArr = new Uint8Array(len * 3);
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for (let point = 0, nextcode = 0, i = 0; i !== len;) {
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point = str.charCodeAt(i), i += 1;
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if (point >= 0xD800 && point <= 0xDBFF) {
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if (i === len) {
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resArr[resPos += 1] = 0xef;
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resArr[resPos += 1] = 0xbf;
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resArr[resPos += 1] = 0xbd;
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break;
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}
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nextcode = str.charCodeAt(i);
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if (nextcode >= 0xDC00 && nextcode <= 0xDFFF) {
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point = (point - 0xD800) * 0x400 + nextcode - 0xDC00 + 0x10000;
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i += 1;
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if (point > 0xffff) {
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resArr[resPos += 1] = (0x1e << 3) | (point >>> 18);
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resArr[resPos += 1] = (0x2 << 6) | ((point >>> 12) & 0x3f);
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resArr[resPos += 1] = (0x2 << 6) | ((point >>> 6) & 0x3f);
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resArr[resPos += 1] = (0x2 << 6) | (point & 0x3f);
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continue;
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}
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} else {
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resArr[resPos += 1] = 0xef;
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resArr[resPos += 1] = 0xbf;
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resArr[resPos += 1] = 0xbd;
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continue;
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}
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}
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if (point <= 0x007f) {
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resArr[resPos += 1] = (0x0 << 7) | point;
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} else if (point <= 0x07ff) {
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resArr[resPos += 1] = (0x6 << 5) | (point >>> 6);
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resArr[resPos += 1] = (0x2 << 6) | (point & 0x3f);
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} else {
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resArr[resPos += 1] = (0xe << 4) | (point >>> 12);
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resArr[resPos += 1] = (0x2 << 6) | ((point >>> 6) & 0x3f);
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resArr[resPos += 1] = (0x2 << 6) | (point & 0x3f);
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}
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}
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return resArr.subarray(0, resPos + 1);
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}
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export function GetString(array: Uint8Array) {
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let str = "";
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let i = 0, len = array.length;
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while (i < len) {
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let c = array[i++];
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switch (c >> 4) {
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case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
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str += String.fromCharCode(c);
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break;
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case 12: case 13:
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str += String.fromCharCode(((c & 0x1F) << 6) | (array[i++] & 0x3F));
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break;
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case 14:
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str += String.fromCharCode(((c & 0x0F) << 12) | ((array[i++] & 0x3F) << 6) | ((array[i++] & 0x3F) << 0));
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break;
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}
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}
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return str;
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}
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export function b64EncodeUnicode(str) {
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return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function (match, p1) {
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return String.fromCharCode('0x' + p1);
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}));
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}
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export function b64DecodeUnicode(str) {
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return decodeURIComponent(atob(str).split('').map(function (c) {
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return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
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}).join(''));
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}
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export function isBase64(str) {
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if (str === '' || str.trim() === '') { return false; }
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try {
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return btoa(atob(str)) == str;
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} catch (err) {
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return false;
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}
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}
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} |