112 lines
2.5 KiB
JavaScript
112 lines
2.5 KiB
JavaScript
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'use strict'
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const { Buffer } = require('buffer') || {}
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const { Encoding } = require('./encoding')
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const textEndec = require('./text-endec')
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/**
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* @template TIn, TOut
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* @extends {Encoding<TIn,Buffer,TOut>}
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*/
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class BufferFormat extends Encoding {
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/**
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* @param {Omit<IEncoding<TIn, Buffer, TOut>, 'format'>} options
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*/
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constructor (options) {
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super({ ...options, format: 'buffer' })
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}
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/** @override */
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createViewTranscoder () {
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return new ViewFormat({
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encode: this.encode, // Buffer is a view (UInt8Array)
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decode: (data) => this.decode(
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Buffer.from(data.buffer, data.byteOffset, data.byteLength)
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),
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name: `${this.name}+view`
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})
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}
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/** @override */
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createBufferTranscoder () {
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return this
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}
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}
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/**
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* @extends {Encoding<TIn,Uint8Array,TOut>}
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* @template TIn, TOut
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*/
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class ViewFormat extends Encoding {
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/**
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* @param {Omit<IEncoding<TIn, Uint8Array, TOut>, 'format'>} options
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*/
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constructor (options) {
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super({ ...options, format: 'view' })
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}
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/** @override */
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createBufferTranscoder () {
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return new BufferFormat({
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encode: (data) => {
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const view = this.encode(data)
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return Buffer.from(view.buffer, view.byteOffset, view.byteLength)
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},
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decode: this.decode, // Buffer is a view (UInt8Array)
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name: `${this.name}+buffer`
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})
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}
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/** @override */
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createViewTranscoder () {
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return this
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}
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}
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/**
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* @extends {Encoding<TIn,string,TOut>}
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* @template TIn, TOut
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*/
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class UTF8Format extends Encoding {
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/**
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* @param {Omit<IEncoding<TIn, string, TOut>, 'format'>} options
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*/
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constructor (options) {
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super({ ...options, format: 'utf8' })
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}
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/** @override */
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createBufferTranscoder () {
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return new BufferFormat({
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encode: (data) => Buffer.from(this.encode(data), 'utf8'),
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decode: (data) => this.decode(data.toString('utf8')),
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name: `${this.name}+buffer`
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})
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}
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/** @override */
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createViewTranscoder () {
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const { textEncoder, textDecoder } = textEndec()
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return new ViewFormat({
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encode: (data) => textEncoder.encode(this.encode(data)),
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decode: (data) => this.decode(textDecoder.decode(data)),
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name: `${this.name}+view`
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})
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}
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/** @override */
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createUTF8Transcoder () {
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return this
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}
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}
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exports.BufferFormat = BufferFormat
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exports.ViewFormat = ViewFormat
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exports.UTF8Format = UTF8Format
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/**
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* @typedef {import('./encoding').IEncoding<TIn,TFormat,TOut>} IEncoding
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* @template TIn, TFormat, TOut
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*/
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