Press n or j to go to the next uncovered block, b, p or k for the previous block.
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const encoder = new TextEncoder()
const decoder = new TextDecoder()
const sjisDecoder = new TextDecoder('sjis')
/**
* @param {string} str - input text
* @returns {Uint8Array} utf8 encoded byte array
*/
export const textToBytes = (str) => encoder.encode(str)
/**
* @param {Uint8Array} bytes - utf8 encoded byte array
* @returns {string} decoded output
*/
export const bytesToText = (bytes) => decoder.decode(bytes)
/**
* @param {string} base64 - input base64 text
* @returns {Uint8Array} byte array
*/
export const base64ToBytes = (base64) => Uint8Array.from(atob(base64), (m) => /** @type {number} */(m.codePointAt(0)))
/**
* @param {Uint8Array} bytes - byte array
* @returns {string} base64 text
*/
export const bytesToBase64 = (bytes) => btoa(Array.from(bytes, (x) => String.fromCodePoint(x)).join(''))
/**
* @param {string} str - input text
* @returns {string} encoded input text in base64
*/
export const textToBase64 = (str) => bytesToBase64(encoder.encode(str))
/**
* @param {string} base64 - input base64 text
* @returns {string} decoded input text
*/
export const base64ToText = (base64) => decoder.decode(base64ToBytes(base64))
/**
* @param {string} hex - hex string
* @returns {string} converted string in base64
*/
export const hexToBase64 = (hex) => bytesToBase64(hexToBytes(hex))
/**
* @param {string} base64 - input base64 text
* @returns {string} converted string in hexadecimal
*/
export const base64ToHex = (base64) => bytesToHex(base64ToBytes(base64))
/**
* @param {string} hex - hex string
* @returns {Uint8Array} byte array
*/
export function hexToBytes (hex) {
const bytes = []
for (let c = 0, e = hex.length; c < e; c += 2) {
bytes.push(Number.parseInt(hex.slice(c, c + 2), 16))
}
return Uint8Array.from(bytes)
}
/**
* @param {Uint8Array} bytes - byte array
* @returns {string} hex string
*/
export const bytesToHex = (bytes) => Array.from(bytes).map(byte => ((byte + 256) & 0xff).toString(16)).join('')
/**
* @param {string} str - input text
* @returns {Uint8Array} SJIS encoded byte array
*/
export const textToSjisBytes = (str) => UTF8ToSJIS(textToBytes(str))
/**
* @param {Uint8Array} bytes - SJIS encoded byte array
* @returns {string} decoded output
*/
export const sjisBytesToText = (bytes) => sjisDecoder.decode(bytes)
/**
* @param {Uint8Array} data - utf8 encoded byte array
* @returns {Uint8Array} SJIS encoded byte array
*/
function UTF8ToSJIS (data) {
const FALLBACK_CHARACTER = 63 // '?'
const UTF8_TO_JIS_TABLE = getUtf8ToJisTable()
/** @type {number[]} */
const results = []
const len = data?.length
let b1, b2, utf8, jis
for (let i = 0; i < len; i++) {
const b = data[i]
if (b >= 0x80) {
if (b <= 0xDF) {
// 2 bytes
utf8 = (b << 8) + data[++i]
} else if (b <= 0xEF) {
// 3 bytes
utf8 = (b << 16) +
(data[++i] << 8) +
(data[++i] & 0xFF)
} else {
// 4 bytes
utf8 = (b << 24) +
(data[++i] << 16) +
(data[++i] << 8) +
(data[++i] & 0xFF)
}
jis = UTF8_TO_JIS_TABLE[utf8]
if (jis == null) {
results[results.length] = FALLBACK_CHARACTER
} else {
if (jis < 0xFF) {
results[results.length] = jis + 0x80
} else {
if (jis > 0x10000) {
jis -= 0x10000
}
b1 = jis >> 8
b2 = jis & 0xFF
if (b1 & 0x01) {
b1 >>= 1
if (b1 < 0x2F) {
b1 += 0x71
} else {
b1 -= 0x4F
}
b2 += b2 > 0x5F ? 0x20 : 0x1F
} else {
b1 >>= 1
if (b1 <= 0x2F) {
b1 += 0x70
} else {
b1 -= 0x50
}
b2 += 0x7E
}
results[results.length] = b1 & 0xFF
results[results.length] = b2 & 0xFF
}
}
} else {
results[results.length] = data[i] & 0xFF
}
}
return Uint8Array.from(results)
}
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