Edit File: singlebyte.js
/** * node-singlebyte */ // The MIT License (MIT) // // Copyright (c) 2013, Sergey Sokoloff (aka Mithgol the Webmaster). // https://github.com/Mithgol/node-singlebyte // // Permission is hereby granted, free of charge, to any person obtaining a copy of // this software and associated documentation files (the "Software"), to deal in // the Software without restriction, including without limitation the rights to // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of // the Software, and to permit persons to whom the Software is furnished to do so, // subject to the following conditions: // // The above copyright notice and this permission notice shall be included in all // copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. var extend = function(target) { target = target || {}; Array.prototype.slice.call(arguments, 1).forEach(function(obj) { Object.keys(obj || {}).forEach(function(key) { target[key] = obj[key]; }); }); return target; }; var singlebyte = function(){ /* jshint indent: false */ if(!( this instanceof singlebyte )){ return new singlebyte(); } this.encodings = []; // CP437 this.learnEncoding('cp437', this.extendASCII([ 0xC7, 0xFC, 0xE9, 0xE2, 0xE4, 0xE0, 0xE5, 0xE7, 0xEA, 0xEB, 0xE8, 0xEF, 0xEE, 0xEC, 0xC4, 0xC5, 0xC9, 0xE6, 0xC6, 0xF4, 0xF6, 0xF2, 0xFB, 0xF9, 0xFF, 0xD6, 0xDC, 0xA2, 0xA3, 0xA5, 0x20A7, 0x192, 0xE1, 0xED, 0xF3, 0xFA, 0xF1, 0xD1, 0xAA, 0xBA, 0xBF, 0x2310, 0xAC, 0xBD, 0xBC, 0xA1, 0xAB, 0xBB, 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580, 0x3B1, 0x3B2, 0x393, 0x3C0, 0x3A3, 0x3C3, 0x3BC, 0x3C4, 0x3A6, 0x398, 0x3A9, 0x3B4, 0x221E, 0x3C6, 0x3B5, 0x2229, 0x2261, 0xB1, 0x2265, 0x2264, 0x2320, 0x2321, 0xF7, 0x2248, 0xB0, 0x2219, 0xB7, 0x221A, 0x207F, 0xB2, 0x25A0, 0xA0 ])); // CP850 this.learnEncoding('cp850', this.extendASCII([ 0xC7, 0xFC, 0xE9, 0xE2, 0xE4, 0xE0, 0xE5, 0xE7, 0xEA, 0xEB, 0xE8, 0xEF, 0xEE, 0xEC, 0xC4, 0xC5, 0xC9, 0xE6, 0xC6, 0xF4, 0xF6, 0xF2, 0xFB, 0xF9, 0xFF, 0xD6, 0xDC, 0xF8, 0xA3, 0xD8, 0xD7, 0x192, 0xE1, 0xED, 0xF3, 0xFA, 0xF1, 0xD1, 0xAA, 0xBA, 0xBF, 0xAE, 0xAC, 0xBD, 0xBC, 0xA1, 0xAB, 0xBB, 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0xC1, 0xC2, 0xC0, 0xA9, 0x2563, 0x2551, 0x2557, 0x255D, 0xA2, 0xA5, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0xE3, 0xC3, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0xA4, 0xF0, 0xD0, 0xCA, 0xCB, 0xC8, 0x131, 0xCD, 0xCE, 0xCF, 0x2518, 0x250C, 0x2588, 0x2584, 0xA6, 0xCC, 0x2580, 0xD3, 0xDF, 0xD4, 0xD2, 0xF5, 0xD5, 0xB5, 0xFE, 0xDE, 0xDA, 0xDB, 0xD9, 0xFD, 0xDD, 0xAF, 0xB4, 0xAD, 0xB1, 0x2017, 0xBE, 0xB6, 0xA7, 0xF7, 0xB8, 0xB0, 0xA8, 0xB7, 0xB9, 0xB3, 0xB2, 0x25A0, 0xA0 ])); // CP858 this.learnEncoding('cp858', this.extendASCII([ 0xC7, 0xFC, 0xE9, 0xE2, 0xE4, 0xE0, 0xE5, 0xE7, 0xEA, 0xEB, 0xE8, 0xEF, 0xEE, 0xEC, 0xC4, 0xC5, 0xC9, 0xE6, 0xC6, 0xF4, 0xF6, 0xF2, 0xFB, 0xF9, 0xFF, 0xD6, 0xDC, 0xF8, 0xA3, 0xD8, 0xD7, 0x192, 0xE1, 0xED, 0xF3, 0xFA, 0xF1, 0xD1, 0xAA, 0xBA, 0xBF, 0xAE, 0xAC, 0xBD, 0xBC, 0xA1, 0xAB, 0xBB, 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0xC1, 0xC2, 0xC0, 0xA9, 0x2563, 0x2551, 0x2557, 0x255D, 0xA2, 0xA5, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0xE3, 0xC3, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0xA4, 0xF0, 0xD0, 0xCA, 0xCB, 0xC8, 0x20AC, 0xCD, 0xCE, 0xCF, 0x2518, 0x250C, 0x2588, 0x2584, 0xA6, 0xCC, 0x2580, 0xD3, 0xDF, 0xD4, 0xD2, 0xF5, 0xD5, 0xB5, 0xFE, 0xDE, 0xDA, 0xDB, 0xD9, 0xFD, 0xDD, 0xAF, 0xB4, 0xAD, 0xB1, 0x2017, 0xBE, 0xB6, 0xA7, 0xF7, 0xB8, 0xB0, 0xA8, 0xB7, 0xB9, 0xB3, 0xB2, 0x25A0, 0xA0 ])); // CP808 this.learnEncoding('cp808', this.extendASCII([ 0x410, 0x411, 0x412, 0x413, 0x414, 0x415, 0x416, 0x417, 0x418, 0x419, 0x41A, 0x41B, 0x41C, 0x41D, 0x41E, 0x41F, 0x420, 0x421, 0x422, 0x423, 0x424, 0x425, 0x426, 0x427, 0x428, 0x429, 0x42A, 0x42B, 0x42C, 0x42D, 0x42E, 0x42F, 0x430, 0x431, 0x432, 0x433, 0x434, 0x435, 0x436, 0x437, 0x438, 0x439, 0x43A, 0x43B, 0x43C, 0x43D, 0x43E, 0x43F, 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580, 0x440, 0x441, 0x442, 0x443, 0x444, 0x445, 0x446, 0x447, 0x448, 0x449, 0x44A, 0x44B, 0x44C, 0x44D, 0x44E, 0x44F, 0x401, 0x451, 0x404, 0x454, 0x407, 0x457, 0x40E, 0x45E, 0xB0, 0x2219, 0xB7, 0x221A, 0x2116, 0x20AC, 0x25A0, 0xA0 ])); // CP866 this.learnEncoding('cp866', this.extendASCII([ 0x410, 0x411, 0x412, 0x413, 0x414, 0x415, 0x416, 0x417, 0x418, 0x419, 0x41A, 0x41B, 0x41C, 0x41D, 0x41E, 0x41F, 0x420, 0x421, 0x422, 0x423, 0x424, 0x425, 0x426, 0x427, 0x428, 0x429, 0x42A, 0x42B, 0x42C, 0x42D, 0x42E, 0x42F, 0x430, 0x431, 0x432, 0x433, 0x434, 0x435, 0x436, 0x437, 0x438, 0x439, 0x43A, 0x43B, 0x43C, 0x43D, 0x43E, 0x43F, 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580, 0x440, 0x441, 0x442, 0x443, 0x444, 0x445, 0x446, 0x447, 0x448, 0x449, 0x44A, 0x44B, 0x44C, 0x44D, 0x44E, 0x44F, 0x401, 0x451, 0x404, 0x454, 0x407, 0x457, 0x40E, 0x45E, 0xB0, 0x2219, 0xB7, 0x221A, 0x2116, 0xA4, 0x25A0, 0xA0 ])); // CP1125 this.learnEncoding('cp1125', this.extendASCII([ 0x410, 0x411, 0x412, 0x413, 0x414, 0x415, 0x416, 0x417, 0x418, 0x419, 0x41A, 0x41B, 0x41C, 0x41D, 0x41E, 0x41F, 0x420, 0x421, 0x422, 0x423, 0x424, 0x425, 0x426, 0x427, 0x428, 0x429, 0x42A, 0x42B, 0x42C, 0x42D, 0x42E, 0x42F, 0x430, 0x431, 0x432, 0x433, 0x434, 0x435, 0x436, 0x437, 0x438, 0x439, 0x43A, 0x43B, 0x43C, 0x43D, 0x43E, 0x43F, 0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556, 0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510, 0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F, 0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567, 0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B, 0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580, 0x440, 0x441, 0x442, 0x443, 0x444, 0x445, 0x446, 0x447, 0x448, 0x449, 0x44A, 0x44B, 0x44C, 0x44D, 0x44E, 0x44F, 0x401, 0x451, 0x490, 0x491, 0x404, 0x454, 0x406, 0x456, 0x407, 0x457, 0xB7, 0x221A, 0x2116, 0xA4, 0x25A0, 0xA0 ])); // KOI8-R this.learnEncoding('koi8-r', this.extendASCII([ 0x2500, 0x2502, 0x250C, 0x2510, 0x2514, 0x2518, 0x251C, 0x2524, 0x252C, 0x2534, 0x253C, 0x2580, 0x2584, 0x2588, 0x258C, 0x2590, 0x2591, 0x2592, 0x2593, 0x2320, 0x25A0, 0x2219, 0x221A, 0x2248, 0x2264, 0x2265, 0xA0, 0x2321, 0xB0, 0xB2, 0xB7, 0xF7, 0x2550, 0x2551, 0x2552, 0x451, 0x2553, 0x2554, 0x2555, 0x2556, 0x2557, 0x2558, 0x2559, 0x255A, 0x255B, 0x255C, 0x255D, 0x255E, 0x255F, 0x2560, 0x2561, 0x401, 0x2562, 0x2563, 0x2564, 0x2565, 0x2566, 0x2567, 0x2568, 0x2569, 0x256A, 0x256B, 0x256C, 0xA9, 0x44E, 0x430, 0x431, 0x446, 0x434, 0x435, 0x444, 0x433, 0x445, 0x438, 0x439, 0x43A, 0x43B, 0x43C, 0x43D, 0x043E, 0x43F, 0x44F, 0x440, 0x441, 0x442, 0x443, 0x436, 0x432, 0x44C, 0x44B, 0x437, 0x448, 0x44D, 0x449, 0x447, 0x44A, 0x42E, 0x410, 0x411, 0x426, 0x414, 0x415, 0x424, 0x413, 0x425, 0x418, 0x419, 0x41A, 0x41B, 0x41C, 0x41D, 0x41E, 0x41F, 0x42F, 0x420, 0x421, 0x422, 0x423, 0x416, 0x412, 0x42C, 0x42B, 0x417, 0x428, 0x42D, 0x429, 0x427, 0x42A ])); // KOI8-U this.learnEncoding('koi8-u', this.extendASCII([ 0x2500, 0x2502, 0x250C, 0x2510, 0x2514, 0x2518, 0x251C, 0x2524, 0x252C, 0x2534, 0x253C, 0x2580, 0x2584, 0x2588, 0x258C, 0x2590, 0x2591, 0x2592, 0x2593, 0x2320, 0x25A0, 0x2219, 0x221A, 0x2248, 0x2264, 0x2265, 0xA0, 0x2321, 0xB0, 0xB2, 0xB7, 0xF7, 0x2550, 0x2551, 0x2552, 0x451, 0x454, 0x2554, 0x456, 0x457, 0x2557, 0x2558, 0x2559, 0x255A, 0x255B, 0x491, 0x255D, 0x255E, 0x255F, 0x2560, 0x2561, 0x401, 0x404, 0x2563, 0x406, 0x407, 0x2566, 0x2567, 0x2568, 0x2569, 0x256A, 0x490, 0x256C, 0xA9, 0x44E, 0x430, 0x431, 0x446, 0x434, 0x435, 0x444, 0x433, 0x445, 0x438, 0x439, 0x43A, 0x43B, 0x43C, 0x43D, 0x043E, 0x43F, 0x44F, 0x440, 0x441, 0x442, 0x443, 0x436, 0x432, 0x44C, 0x44B, 0x437, 0x448, 0x44D, 0x449, 0x447, 0x44A, 0x42E, 0x410, 0x411, 0x426, 0x414, 0x415, 0x424, 0x413, 0x425, 0x418, 0x419, 0x41A, 0x41B, 0x41C, 0x41D, 0x41E, 0x41F, 0x42F, 0x420, 0x421, 0x422, 0x423, 0x416, 0x412, 0x42C, 0x42B, 0x417, 0x428, 0x42D, 0x429, 0x427, 0x42A ])); // KOI8-RU this.learnEncoding('koi8-ru', this.extendASCII([ 0x2500, 0x2502, 0x250C, 0x2510, 0x2514, 0x2518, 0x251C, 0x2524, 0x252C, 0x2534, 0x253C, 0x2580, 0x2584, 0x2588, 0x258C, 0x2590, 0x2591, 0x2592, 0x2593, 0x2320, 0x25A0, 0x2219, 0x221A, 0x2248, 0x2264, 0x2265, 0xA0, 0x2321, 0xB0, 0xB2, 0xB7, 0xF7, 0x2550, 0x2551, 0x2552, 0x451, 0x454, 0x2554, 0x456, 0x457, 0x2557, 0x2558, 0x2559, 0x255A, 0x255B, 0x491, 0x45E, 0x255E, 0x255F, 0x2560, 0x2561, 0x401, 0x404, 0x2563, 0x406, 0x407, 0x2566, 0x2567, 0x2568, 0x2569, 0x256A, 0x490, 0x40E, 0xA9, 0x44E, 0x430, 0x431, 0x446, 0x434, 0x435, 0x444, 0x433, 0x445, 0x438, 0x439, 0x43A, 0x43B, 0x43C, 0x43D, 0x043E, 0x43F, 0x44F, 0x440, 0x441, 0x442, 0x443, 0x436, 0x432, 0x44C, 0x44B, 0x437, 0x448, 0x44D, 0x449, 0x447, 0x44A, 0x42E, 0x410, 0x411, 0x426, 0x414, 0x415, 0x424, 0x413, 0x425, 0x418, 0x419, 0x41A, 0x41B, 0x41C, 0x41D, 0x41E, 0x41F, 0x42F, 0x420, 0x421, 0x422, 0x423, 0x416, 0x412, 0x42C, 0x42B, 0x417, 0x428, 0x42D, 0x429, 0x427, 0x42A ])); // LATIN-1 aka ISO 8859-1 (Western European) this.learnEncoding('latin-1', this.extendASCII([ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF ])); // Windows-1252 this.learnEncoding('cp1252', this.extendASCII([ 0x20AC, 0x81, 0x201A, 0x192, 0x201E, 0x2026, 0x2020, 0x2021, 0x2C6, 0x2030, 0x160, 0x2039, 0x152, 0x8D, 0x017D, 0x8F, 0x90, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014, 0x02DC, 0x2122, 0x161, 0x203A, 0x0153, 0x9D, 0x17E, 0x178, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF ])); }; singlebyte.prototype.isEncoding = function(encodingName){ if( Buffer.isEncoding(encodingName) ) return true; for( var i = 0; i < this.encodings.length; i++ ){ if( this.encodings[i].name === encodingName ) return true; } return false; }; singlebyte.prototype.learnEncoding = function(encodingName, encodingTable){ /*jshint bitwise: false */ if( Buffer.isEncoding(encodingName) ){ throw new Error(this.errors.BUFFER_ENCODING); } if( encodingTable.length !== 256 ){ throw new Error(this.errors.INVALID_TABLE_LENGTH); } var _this = this; encodingTable = encodingTable.map(function(item){ var nextCode = item |0; if( 0 > nextCode || nextCode > 0x10FFFF ){ throw new Error(_this.errors.OUT_OF_UNICODE); } return item; }); if( this.isEncoding(encodingName) ){ for( var i = 0; i < this.encodings.length; i++ ){ if( this.encodings[i].name === encodingName ){ this.encodings[i].table = encodingTable; return; } } } else { this.encodings.push({ name: encodingName, table: encodingTable }); } }; singlebyte.prototype.getEncodingTable = function(encodingName){ for( var i = 0; i < this.encodings.length; i++ ){ if( this.encodings[i].name === encodingName ){ return this.encodings[i].table; } } return null; }; singlebyte.prototype.extendASCII = function(extensionTable){ if( extensionTable.length !== 128 ){ throw new Error(this.errors.INVALID_EXTENSION); } var output = []; for( var i = 0; i < 128; i++ ) output.push(i); return output.concat(extensionTable); }; singlebyte.prototype.bufToStr = function(buf, encoding, start, end){ /* jshint bitwise: false */ if(!( Buffer.isBuffer(buf) )){ throw new Error(this.errors.NOT_A_BUFFER); } if( Buffer.isEncoding(encoding) ){ return buf.toString(encoding, start, end); } var table = this.getEncodingTable(encoding); if( table === null ) throw new Error(this.errors.UNKNOWN_ENCODING); if( typeof end === 'undefined' ) end = buf.length; if( typeof start === 'undefined' ) start = 0; var output = ''; var sourceValue; for( var i = start; i < end; i++ ){ sourceValue = table[ buf[i] ]; if( sourceValue <= 0xFFFF ){ output += String.fromCharCode(sourceValue); } else if( 0x10000 <= sourceValue && sourceValue <= 0x10FFFF ){ sourceValue -= 0x10000; output += String.fromCharCode( 0xD800 + (sourceValue >> 10) ); output += String.fromCharCode( 0xDC00 + (sourceValue & 0x3FF) ); } else throw new Error(this.errors.OUT_OF_UNICODE); } return output; }; var strToBufDefaults = { defaultCode: 0x3F // '?' }; singlebyte.prototype.strToBuf = function(str, encoding, encodingOptions){ if( Buffer.isEncoding(encoding) ){ return new Buffer(str, encoding); } str = '' + str; var options = extend({}, strToBufDefaults, encodingOptions); var table = this.getEncodingTable(encoding); if( table === null ) throw new Error(this.errors.UNKNOWN_ENCODING); var output = []; for( var i = 0; i < str.length; i++ ){ var charUnicode; var thisCharCode = str.charCodeAt(i); if( 0xD800 <= thisCharCode && thisCharCode <= 0xDBFF && i+1 < str.length ){ var nextCharCode = str.charCodeAt(i+1); if( 0xDC00 <= nextCharCode && nextCharCode <= 0xDFFF ){ charUnicode = 0x10000 + (thisCharCode - 0xD800)*0x400 + (nextCharCode - 0xDC00); i++; } else { charUnicode = thisCharCode; } } else { charUnicode = thisCharCode; } var codeFoundIndex = table.indexOf(charUnicode); if( codeFoundIndex < 0 ){ output.push(options.defaultCode); } else { output.push(codeFoundIndex); } } return new Buffer(output); }; singlebyte.prototype.errors = { NOT_A_BUFFER : 'The given source is not a buffer!', UNKNOWN_ENCODING : 'The given encoding is not defined!', INVALID_TABLE_LENGTH : 'The encoding table must have 256 elements!', INVALID_EXTENSION : 'The ASCII extension table must have 128 elements!', BUFFER_ENCODING : "Cannot redefine a Node's encoding!", OUT_OF_UNICODE : "An encoding table's element is greater than 0x10FFFF!" }; module.exports = singlebyte();
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