60 lines
1.3 KiB
TypeScript
60 lines
1.3 KiB
TypeScript
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import { bases } from 'multiformats/basics'
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import { allocUnsafe } from '../alloc.js'
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import type { MultibaseCodec } from 'multiformats'
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function createCodec (name: string, prefix: string, encode: (buf: Uint8Array) => string, decode: (str: string) => Uint8Array): MultibaseCodec<any> {
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return {
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name,
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prefix,
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encoder: {
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name,
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prefix,
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encode
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},
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decoder: {
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decode
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}
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}
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}
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const string = createCodec('utf8', 'u', (buf) => {
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const decoder = new TextDecoder('utf8')
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return 'u' + decoder.decode(buf)
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}, (str) => {
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const encoder = new TextEncoder()
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return encoder.encode(str.substring(1))
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})
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const ascii = createCodec('ascii', 'a', (buf) => {
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let string = 'a'
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for (let i = 0; i < buf.length; i++) {
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string += String.fromCharCode(buf[i])
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}
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return string
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}, (str) => {
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str = str.substring(1)
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const buf = allocUnsafe(str.length)
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for (let i = 0; i < str.length; i++) {
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buf[i] = str.charCodeAt(i)
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}
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return buf
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})
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export type SupportedEncodings = 'utf8' | 'utf-8' | 'hex' | 'latin1' | 'ascii' | 'binary' | keyof typeof bases
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const BASES: Record<SupportedEncodings, MultibaseCodec<any>> = {
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utf8: string,
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'utf-8': string,
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hex: bases.base16,
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latin1: ascii,
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ascii,
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binary: ascii,
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...bases
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}
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export default BASES
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