136 lines
3.3 KiB
JavaScript
136 lines
3.3 KiB
JavaScript
'use strict'
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const { Buffer } = require('buffer') || { Buffer: { isBuffer: () => false } }
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const { textEncoder, textDecoder } = require('./text-endec')()
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const { BufferFormat, ViewFormat, UTF8Format } = require('./formats')
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/** @type {<T>(v: T) => v} */
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const identity = (v) => v
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/**
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* @type {typeof import('./encodings').utf8}
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*/
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exports.utf8 = new UTF8Format({
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encode: function (data) {
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// On node 16.9.1 buffer.toString() is 5x faster than TextDecoder
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return Buffer.isBuffer(data)
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? data.toString('utf8')
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: ArrayBuffer.isView(data)
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? textDecoder.decode(data)
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: String(data)
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},
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decode: identity,
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name: 'utf8',
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createViewTranscoder () {
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return new ViewFormat({
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encode: function (data) {
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return ArrayBuffer.isView(data) ? data : textEncoder.encode(data)
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},
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decode: function (data) {
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return textDecoder.decode(data)
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},
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name: `${this.name}+view`
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})
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},
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createBufferTranscoder () {
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return new BufferFormat({
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encode: function (data) {
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return Buffer.isBuffer(data)
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? data
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: ArrayBuffer.isView(data)
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? Buffer.from(data.buffer, data.byteOffset, data.byteLength)
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: Buffer.from(String(data), 'utf8')
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},
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decode: function (data) {
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return data.toString('utf8')
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},
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name: `${this.name}+buffer`
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})
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}
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})
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/**
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* @type {typeof import('./encodings').json}
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*/
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exports.json = new UTF8Format({
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encode: JSON.stringify,
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decode: JSON.parse,
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name: 'json'
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})
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/**
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* @type {typeof import('./encodings').buffer}
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*/
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exports.buffer = new BufferFormat({
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encode: function (data) {
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return Buffer.isBuffer(data)
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? data
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: ArrayBuffer.isView(data)
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? Buffer.from(data.buffer, data.byteOffset, data.byteLength)
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: Buffer.from(String(data), 'utf8')
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},
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decode: identity,
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name: 'buffer',
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createViewTranscoder () {
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return new ViewFormat({
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encode: function (data) {
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return ArrayBuffer.isView(data) ? data : Buffer.from(String(data), 'utf8')
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},
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decode: function (data) {
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return Buffer.from(data.buffer, data.byteOffset, data.byteLength)
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},
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name: `${this.name}+view`
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})
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}
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})
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/**
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* @type {typeof import('./encodings').view}
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*/
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exports.view = new ViewFormat({
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encode: function (data) {
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return ArrayBuffer.isView(data) ? data : textEncoder.encode(data)
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},
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decode: identity,
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name: 'view',
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createBufferTranscoder () {
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return new BufferFormat({
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encode: function (data) {
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return Buffer.isBuffer(data)
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? data
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: ArrayBuffer.isView(data)
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? Buffer.from(data.buffer, data.byteOffset, data.byteLength)
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: Buffer.from(String(data), 'utf8')
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},
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decode: identity,
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name: `${this.name}+buffer`
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})
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}
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})
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/**
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* @type {typeof import('./encodings').hex}
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*/
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exports.hex = new BufferFormat({
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encode: function (data) {
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return Buffer.isBuffer(data) ? data : Buffer.from(String(data), 'hex')
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},
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decode: function (buffer) {
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return buffer.toString('hex')
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},
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name: 'hex'
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})
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/**
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* @type {typeof import('./encodings').base64}
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*/
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exports.base64 = new BufferFormat({
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encode: function (data) {
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return Buffer.isBuffer(data) ? data : Buffer.from(String(data), 'base64')
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},
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decode: function (buffer) {
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return buffer.toString('base64')
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},
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name: 'base64'
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})
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