var fs = require('fs'); var utf8 = require('./encoding/utf8'), unicode = require('./encoding/unicode'), mbcs = require('./encoding/mbcs'), sbcs = require('./encoding/sbcs'), iso2022 = require('./encoding/iso2022'); var self = this; var recognisers = [ new utf8, new unicode.UTF_16BE, new unicode.UTF_16LE, new unicode.UTF_32BE, new unicode.UTF_32LE, new mbcs.sjis, new mbcs.big5, new mbcs.euc_jp, new mbcs.euc_kr, new mbcs.gb_18030, new iso2022.ISO_2022_JP, new iso2022.ISO_2022_KR, new iso2022.ISO_2022_CN, new sbcs.ISO_8859_1, new sbcs.ISO_8859_2, new sbcs.ISO_8859_5, new sbcs.ISO_8859_6, new sbcs.ISO_8859_7, new sbcs.ISO_8859_8, new sbcs.ISO_8859_9, new sbcs.windows_1251, new sbcs.windows_1256, new sbcs.KOI8_R ]; module.exports.detect = function(buffer) { // Tally up the byte occurence statistics. var fByteStats = []; for (var i = 0; i < 256; i++) fByteStats[i] = 0; for (var i = buffer.length - 1; i >= 0; i--) fByteStats[buffer[i] & 0x00ff]++; var fC1Bytes = false; for (var i = 0x80; i <= 0x9F; i += 1) { if (fByteStats[i] != 0) { fC1Bytes = true; break; } } var context = { fByteStats: fByteStats, fC1Bytes: fC1Bytes, fRawInput: buffer, fRawLength: buffer.length, fInputBytes: buffer, fInputLen: buffer.length }; var match = recognisers.map(function(rec) { return rec.match(context); }).filter(function(match) { return !!match; }).sort(function(a, b) { return a.confidence - b.confidence; }).pop(); return match ? match.name : null; }; module.exports.detectFile = function(filepath, fn) { fs.readFile(filepath, function(err, res) { if (err) return fn(err, null); fn(null, self.detect(res)); }); }; module.exports.detectFileSync = function(filepath) { return self.detect(fs.readFileSync(filepath)); };