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* Moves transcode and normalize to buffer module statics * Moves getCharacterProperty and getColumnWidth to util
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,96 @@ | ||
| 'use strict'; | ||
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| const Buffer = require('buffer').Buffer; | ||
| const normalizeEncoding = require('internal/util').normalizeEncoding; | ||
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| if (process.binding('config').hasIntl) { | ||
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| const icu = process.binding('icu'); | ||
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| // Maps the supported transcoding conversions. The top key is the from_enc, | ||
| // the child key is the to_enc. The value is the transcoding function to. | ||
| const conversions = { | ||
| 'ascii': { | ||
| 'latin1': (source) => { | ||
| return Buffer.from(source); | ||
| }, | ||
| 'utf8': (source) => { | ||
| return Buffer.from(source); | ||
| }, | ||
| 'utf16le': (source) => { | ||
| return icu.convertToUcs2('us-ascii', source); | ||
| } | ||
| }, | ||
| 'latin1': { | ||
| 'ascii': (source) => { | ||
| return icu.convert('us-ascii', 'iso8859-1', source); | ||
| }, | ||
| 'utf8': (source) => { | ||
| return icu.convert('utf-8', 'iso8859-1', source); | ||
| }, | ||
| 'utf16le': (source) => { | ||
| return icu.convertToUcs2('iso8859-1', source); | ||
| } | ||
| }, | ||
| 'utf8': { | ||
| 'ascii': (source) => { | ||
| return icu.convert('us-ascii', 'utf-8', source); | ||
| }, | ||
| 'latin1': (source) => { | ||
| return icu.convert('iso-8859-1', 'utf-8', source); | ||
| }, | ||
| 'utf16le': icu.convertToUcs2FromUtf8, | ||
| }, | ||
| 'utf16le': { | ||
| 'ascii': (source) => { | ||
| if (source.length % 2 !== 0) | ||
| throw new TypeError('Invalid UCS2 Buffer'); | ||
| return icu.convertFromUcs2('us-ascii', source); | ||
| }, | ||
| 'latin1': (source) => { | ||
| if (source.length % 2 !== 0) | ||
| throw new TypeError('Invalid UCS2 Buffer'); | ||
| return icu.convertFromUcs2('iso-8859-1', source); | ||
| }, | ||
| 'utf8': (source) => { | ||
| if (source.length % 2 !== 0) | ||
| throw new TypeError('Invalid UCS2 Buffer'); | ||
| return icu.convertToUtf8FromUcs2(source); | ||
| } | ||
| } | ||
| }; | ||
|
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| // Transcodes the Buffer from one encoding to another, returning a new | ||
| // Buffer instance. | ||
| exports.transcode = function transcode(source, from_enc, to_enc) { | ||
| if (!source || !(source.buffer instanceof ArrayBuffer)) | ||
| throw new TypeError('"source" argument must be a Buffer'); | ||
| if (source.length === 0) return Buffer.alloc(0); | ||
|
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| from_enc = normalizeEncoding(from_enc) || from_enc; | ||
| to_enc = normalizeEncoding(to_enc) || to_enc; | ||
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| if (from_enc === to_enc) | ||
| return Buffer.from(source); | ||
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| const cnv_from = conversions[from_enc]; | ||
|
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| if (cnv_from) { | ||
| const cnv_to = cnv_from[to_enc]; | ||
| if (cnv_to) | ||
| return cnv_to(source); | ||
| } | ||
| throw new TypeError(`Unsupported conversion: ${from_enc} to ${to_enc}`); | ||
| }; | ||
|
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| // Perform Unicode Normalization on the Buffer. | ||
| exports.normalize = function normalize(buf, form, encoding) { | ||
| if (!buf || !(buf.buffer instanceof ArrayBuffer)) | ||
| throw new TypeError('First argument must be a Buffer'); | ||
| encoding = normalizeEncoding(encoding); | ||
| if (encoding === 'ascii') | ||
| encoding == 'us-ascii'; | ||
| return icu.normalize(buf, encoding, String(form).toUpperCase()); | ||
| }; | ||
|
|
||
| } |
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