122 lines
2.8 KiB
JavaScript
122 lines
2.8 KiB
JavaScript
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'use strict';
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/* eslint-disable no-bitwise */
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var decodeCache = {};
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function getDecodeCache(exclude) {
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var i, ch, cache = decodeCache[exclude];
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if (cache) { return cache; }
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cache = decodeCache[exclude] = [];
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for (i = 0; i < 128; i++) {
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ch = String.fromCharCode(i);
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cache.push(ch);
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}
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for (i = 0; i < exclude.length; i++) {
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ch = exclude.charCodeAt(i);
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cache[ch] = '%' + ('0' + ch.toString(16).toUpperCase()).slice(-2);
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}
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return cache;
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}
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// Decode percent-encoded string.
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//
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function decode(string, exclude) {
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var cache;
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if (typeof exclude !== 'string') {
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exclude = decode.defaultChars;
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}
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cache = getDecodeCache(exclude);
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return string.replace(/(%[a-f0-9]{2})+/gi, function(seq) {
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var i, l, b1, b2, b3, b4, chr,
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result = '';
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for (i = 0, l = seq.length; i < l; i += 3) {
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b1 = parseInt(seq.slice(i + 1, i + 3), 16);
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if (b1 < 0x80) {
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result += cache[b1];
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continue;
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}
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if ((b1 & 0xE0) === 0xC0 && (i + 3 < l)) {
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// 110xxxxx 10xxxxxx
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b2 = parseInt(seq.slice(i + 4, i + 6), 16);
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if ((b2 & 0xC0) === 0x80) {
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chr = ((b1 << 6) & 0x7C0) | (b2 & 0x3F);
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if (chr < 0x80) {
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result += '\ufffd\ufffd';
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} else {
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result += String.fromCharCode(chr);
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}
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i += 3;
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continue;
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}
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}
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if ((b1 & 0xF0) === 0xE0 && (i + 6 < l)) {
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// 1110xxxx 10xxxxxx 10xxxxxx
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b2 = parseInt(seq.slice(i + 4, i + 6), 16);
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b3 = parseInt(seq.slice(i + 7, i + 9), 16);
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if ((b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {
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chr = ((b1 << 12) & 0xF000) | ((b2 << 6) & 0xFC0) | (b3 & 0x3F);
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if (chr < 0x800 || (chr >= 0xD800 && chr <= 0xDFFF)) {
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result += '\ufffd\ufffd\ufffd';
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} else {
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result += String.fromCharCode(chr);
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}
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i += 6;
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continue;
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}
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}
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if ((b1 & 0xF8) === 0xF0 && (i + 9 < l)) {
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// 111110xx 10xxxxxx 10xxxxxx 10xxxxxx
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b2 = parseInt(seq.slice(i + 4, i + 6), 16);
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b3 = parseInt(seq.slice(i + 7, i + 9), 16);
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b4 = parseInt(seq.slice(i + 10, i + 12), 16);
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if ((b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80 && (b4 & 0xC0) === 0x80) {
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chr = ((b1 << 18) & 0x1C0000) | ((b2 << 12) & 0x3F000) | ((b3 << 6) & 0xFC0) | (b4 & 0x3F);
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if (chr < 0x10000 || chr > 0x10FFFF) {
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result += '\ufffd\ufffd\ufffd\ufffd';
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} else {
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chr -= 0x10000;
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result += String.fromCharCode(0xD800 + (chr >> 10), 0xDC00 + (chr & 0x3FF));
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}
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i += 9;
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continue;
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}
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}
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result += '\ufffd';
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}
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return result;
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});
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}
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decode.defaultChars = ';/?:@&=+$,#';
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decode.componentChars = '';
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module.exports = decode;
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