115 lines
2.4 KiB
JavaScript
115 lines
2.4 KiB
JavaScript
'use strict'
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// Node has always utf-8
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const utf8Decoder = new TextDecoder('utf-8')
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const textDecoders = new Map([
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['utf-8', utf8Decoder],
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['utf8', utf8Decoder]
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])
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function getDecoder (charset) {
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let lc
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while (true) {
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switch (charset) {
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case 'utf-8':
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case 'utf8':
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return decoders.utf8
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case 'latin1':
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case 'ascii': // TODO: Make these a separate, strict decoder?
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case 'us-ascii':
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case 'iso-8859-1':
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case 'iso8859-1':
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case 'iso88591':
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case 'iso_8859-1':
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case 'windows-1252':
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case 'iso_8859-1:1987':
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case 'cp1252':
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case 'x-cp1252':
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return decoders.latin1
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case 'utf16le':
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case 'utf-16le':
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case 'ucs2':
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case 'ucs-2':
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return decoders.utf16le
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case 'base64':
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return decoders.base64
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default:
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if (lc === undefined) {
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lc = true
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charset = charset.toLowerCase()
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continue
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}
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return decoders.other.bind(charset)
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}
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}
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}
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const decoders = {
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utf8: (data, sourceEncoding) => {
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if (data.length === 0) {
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return ''
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}
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if (typeof data === 'string') {
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data = Buffer.from(data, sourceEncoding)
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}
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return data.utf8Slice(0, data.length)
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},
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latin1: (data, sourceEncoding) => {
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if (data.length === 0) {
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return ''
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}
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if (typeof data === 'string') {
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return data
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}
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return data.latin1Slice(0, data.length)
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},
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utf16le: (data, sourceEncoding) => {
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if (data.length === 0) {
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return ''
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}
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if (typeof data === 'string') {
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data = Buffer.from(data, sourceEncoding)
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}
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return data.ucs2Slice(0, data.length)
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},
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base64: (data, sourceEncoding) => {
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if (data.length === 0) {
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return ''
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}
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if (typeof data === 'string') {
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data = Buffer.from(data, sourceEncoding)
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}
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return data.base64Slice(0, data.length)
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},
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other: (data, sourceEncoding) => {
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if (data.length === 0) {
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return ''
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}
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if (typeof data === 'string') {
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data = Buffer.from(data, sourceEncoding)
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}
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if (textDecoders.has(this.toString())) {
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try {
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return textDecoders.get(this).decode(data)
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} catch {}
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}
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return typeof data === 'string'
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? data
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: data.toString()
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}
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}
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function decodeText (text, sourceEncoding, destEncoding) {
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if (text) {
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return getDecoder(destEncoding)(text, sourceEncoding)
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}
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return text
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}
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module.exports = decodeText
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