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