69 lines
1.6 KiB
JavaScript
69 lines
1.6 KiB
JavaScript
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var fs = require('fs');
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var utf8 = require('./encoding/utf8'),
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unicode = require('./encoding/unicode'),
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mbcs = require('./encoding/mbcs'),
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sbcs = require('./encoding/sbcs'),
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iso2022 = require('./encoding/iso2022');
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var self = this;
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var recognisers = [
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new utf8,
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new unicode.UTF_16BE,
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new unicode.UTF_16LE,
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new unicode.UTF_32BE,
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new unicode.UTF_32LE,
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new mbcs.sjis,
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new mbcs.big5,
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new mbcs.euc_jp,
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new mbcs.euc_kr,
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new mbcs.gb_18030,
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new iso2022.ISO_2022_JP,
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new iso2022.ISO_2022_KR,
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new iso2022.ISO_2022_CN,
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new sbcs.ISO_8859_1,
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new sbcs.ISO_8859_2,
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new sbcs.ISO_8859_5,
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new sbcs.ISO_8859_6,
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new sbcs.ISO_8859_7,
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new sbcs.ISO_8859_8,
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new sbcs.ISO_8859_9
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];
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module.exports.detect = function(buffer) {
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var context = {
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fRawInput: buffer,
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fRawLength: buffer.length,
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fInputBytes: buffer,
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fInputLen: buffer.length
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};
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var matches = recognisers.map(function(rec) {
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return rec.match(context);
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}).filter(function(match) {
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return !!match;
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});
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matches.sort(function(a, b) {
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return a.confidence - b.confidence;
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});
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// console.log(matches);
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return matches.length ? matches.pop().name : null;
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};
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module.exports.detectFile = function(filepath, fn) {
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fs.readFile(filepath, function(err, res) {
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if (err)
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return fn(err, null);
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fn(null, self.detect(res));
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});
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};
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module.exports.detectFileSync = function(filepath) {
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return self.detect(fs.readFileSync(filepath));
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}; |