65 lines
1.3 KiB
JavaScript
65 lines
1.3 KiB
JavaScript
const PassThroughDecoder = require('./lib/pass-through-decoder')
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const UTF8Decoder = require('./lib/utf8-decoder')
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module.exports = class TextDecoder {
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constructor (encoding = 'utf8') {
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this.encoding = normalizeEncoding(encoding)
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switch (this.encoding) {
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case 'utf8':
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this.decoder = new UTF8Decoder()
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break
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case 'utf16le':
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case 'base64':
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throw new Error('Unsupported encoding: ' + this.encoding)
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default:
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this.decoder = new PassThroughDecoder(this.encoding)
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}
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}
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get remaining () {
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return this.decoder.remaining
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}
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push (data) {
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if (typeof data === 'string') return data
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return this.decoder.decode(data)
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}
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// For Node.js compatibility
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write (data) {
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return this.push(data)
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}
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end (data) {
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let result = ''
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if (data) result = this.push(data)
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result += this.decoder.flush()
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return result
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}
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}
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function normalizeEncoding (encoding) {
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encoding = encoding.toLowerCase()
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switch (encoding) {
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case 'utf8':
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case 'utf-8':
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return 'utf8'
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case 'ucs2':
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case 'ucs-2':
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case 'utf16le':
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case 'utf-16le':
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return 'utf16le'
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case 'latin1':
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case 'binary':
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return 'latin1'
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case 'base64':
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case 'ascii':
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case 'hex':
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return encoding
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default:
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throw new Error('Unknown encoding: ' + encoding)
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}
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};
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