Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | 6x 6x 6x 6x 6x 6x 32x 32x 32x 6x 6x 33x 33x 6x 34x 8704x 61438x 34x 34x 561x 17x 17x 34x 34x 782x 782x 438x 34x 6x 2x 2x 2x 2x 1x 2x 2x 2x 1x 1x 1x 1x 1x 1x 6x 30x 30x 1x 1x 1x 1x 1x 29x 6x | import { Match } from './match';
import { Recogniser, Context } from './encoding';
import Utf8 from './encoding/utf8';
import * as unicode from './encoding/unicode';
import * as mbcs from './encoding/mbcs';
import * as sbcs from './encoding/sbcs';
import * as iso2022 from './encoding/iso2022';
let fsModule: any;
const loadFs = () => {
Eif (typeof module === 'object' && typeof module.exports === 'object') {
fsModule = fsModule ? fsModule : require('fs');
return fsModule;
}
throw new Error('File system is not available');
}
interface FullOptions {
sampleSize: number
}
type Options = Partial<FullOptions>
const recognisers: Recogniser[] = [
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(),
];
type DetectResult = Match[] | string | null;
export const detect = (buffer: Uint8Array): string | null => {
const matches: Match[] = analyse(buffer);
return matches.length > 0 ? matches[0].name : null;
};
export const analyse = (buffer: Uint8Array): Match[] => {
// Tally up the byte occurrence statistics.
const fByteStats = [];
for (let i = 0; i < 256; i++) fByteStats[i] = 0;
for (let i = buffer.length - 1; i >= 0; i--) fByteStats[buffer[i] & 0x00ff]++;
let fC1Bytes = false;
for (let i = 0x80; i <= 0x9f; i += 1) {
if (fByteStats[i] !== 0) {
fC1Bytes = true;
break;
}
}
const context: Context = {
fByteStats,
fC1Bytes,
fRawInput: buffer,
fRawLength: buffer.length,
fInputBytes: buffer,
fInputLen: buffer.length,
};
const matches = recognisers
.map((rec) => {
return rec.match(context);
})
.filter((match) => {
return !!match;
})
.sort((a, b) => {
return b!.confidence - a!.confidence;
});
return matches as Match[];
}
export const detectFile = (filepath: string, opts: Options = {}): Promise<DetectResult> =>
new Promise((resolve, reject) => {
let fd: any;
const fs = loadFs();
const handler = (err: Error | null | undefined, buffer: Buffer) => {
if (fd) {
fs.closeSync(fd);
}
Iif (err) {
reject(err);
} else {
resolve(detect(buffer));
}
};
if (opts && opts.sampleSize) {
fd = fs.openSync(filepath, 'r');
const sample: Buffer = Buffer.allocUnsafe(opts.sampleSize);
fs.read(fd, sample, 0, opts.sampleSize, null, (err?: Error) => {
handler(err, sample);
});
return;
}
fs.readFile(filepath, handler);
});
export const detectFileSync = (filepath: string, opts: Options = {}): DetectResult => {
const fs = loadFs();
if (opts && opts.sampleSize) {
const fd = fs.openSync(filepath, 'r');
const sample = Buffer.allocUnsafe(opts.sampleSize);
fs.readSync(fd, sample, 0, opts.sampleSize);
fs.closeSync(fd);
return detect(sample);
}
return detect(fs.readFileSync(filepath));
};
export default {
analyse,
detect,
detectFileSync,
detectFile,
};
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