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122 lines
2.8 KiB
122 lines
2.8 KiB
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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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