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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/viem/_esm/utils/encoding
Просмотр файла: toBytes.js
import { BaseError } from '../../errors/base.js';
import { isHex } from '../data/isHex.js';
import { pad } from '../data/pad.js';
import { assertSize } from './fromHex.js';
import { numberToHex, } from './toHex.js';
const encoder = /*#__PURE__*/ new TextEncoder();
/**
* Encodes a UTF-8 string, hex value, bigint, number or boolean to a byte array.
*
* - Docs: https://viem.sh/docs/utilities/toBytes
* - Example: https://viem.sh/docs/utilities/toBytes#usage
*
* @param value Value to encode.
* @param opts Options.
* @returns Byte array value.
*
* @example
* import { toBytes } from 'viem'
* const data = toBytes('Hello world')
* // Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33])
*
* @example
* import { toBytes } from 'viem'
* const data = toBytes(420)
* // Uint8Array([1, 164])
*
* @example
* import { toBytes } from 'viem'
* const data = toBytes(420, { size: 4 })
* // Uint8Array([0, 0, 1, 164])
*/
export function toBytes(value, opts = {}) {
if (typeof value === 'number' || typeof value === 'bigint')
return numberToBytes(value, opts);
if (typeof value === 'boolean')
return boolToBytes(value, opts);
if (isHex(value))
return hexToBytes(value, opts);
return stringToBytes(value, opts);
}
/**
* Encodes a boolean into a byte array.
*
* - Docs: https://viem.sh/docs/utilities/toBytes#booltobytes
*
* @param value Boolean value to encode.
* @param opts Options.
* @returns Byte array value.
*
* @example
* import { boolToBytes } from 'viem'
* const data = boolToBytes(true)
* // Uint8Array([1])
*
* @example
* import { boolToBytes } from 'viem'
* const data = boolToBytes(true, { size: 32 })
* // Uint8Array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1])
*/
export function boolToBytes(value, opts = {}) {
const bytes = new Uint8Array(1);
bytes[0] = Number(value);
if (typeof opts.size === 'number') {
assertSize(bytes, { size: opts.size });
return pad(bytes, { size: opts.size });
}
return bytes;
}
// We use very optimized technique to convert hex string to byte array
const charCodeMap = {
zero: 48,
nine: 57,
A: 65,
F: 70,
a: 97,
f: 102,
};
function charCodeToBase16(char) {
if (char >= charCodeMap.zero && char <= charCodeMap.nine)
return char - charCodeMap.zero;
if (char >= charCodeMap.A && char <= charCodeMap.F)
return char - (charCodeMap.A - 10);
if (char >= charCodeMap.a && char <= charCodeMap.f)
return char - (charCodeMap.a - 10);
return undefined;
}
/**
* Encodes a hex string into a byte array.
*
* - Docs: https://viem.sh/docs/utilities/toBytes#hextobytes
*
* @param hex Hex string to encode.
* @param opts Options.
* @returns Byte array value.
*
* @example
* import { hexToBytes } from 'viem'
* const data = hexToBytes('0x48656c6c6f20776f726c6421')
* // Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33])
*
* @example
* import { hexToBytes } from 'viem'
* const data = hexToBytes('0x48656c6c6f20776f726c6421', { size: 32 })
* // Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
*/
export function hexToBytes(hex_, opts = {}) {
let hex = hex_;
if (opts.size) {
assertSize(hex, { size: opts.size });
hex = pad(hex, { dir: 'right', size: opts.size });
}
let hexString = hex.slice(2);
if (hexString.length % 2)
hexString = `0${hexString}`;
const length = hexString.length / 2;
const bytes = new Uint8Array(length);
for (let index = 0, j = 0; index < length; index++) {
const nibbleLeft = charCodeToBase16(hexString.charCodeAt(j++));
const nibbleRight = charCodeToBase16(hexString.charCodeAt(j++));
if (nibbleLeft === undefined || nibbleRight === undefined) {
throw new BaseError(`Invalid byte sequence ("${hexString[j - 2]}${hexString[j - 1]}" in "${hexString}").`);
}
bytes[index] = nibbleLeft * 16 + nibbleRight;
}
return bytes;
}
/**
* Encodes a number into a byte array.
*
* - Docs: https://viem.sh/docs/utilities/toBytes#numbertobytes
*
* @param value Number to encode.
* @param opts Options.
* @returns Byte array value.
*
* @example
* import { numberToBytes } from 'viem'
* const data = numberToBytes(420)
* // Uint8Array([1, 164])
*
* @example
* import { numberToBytes } from 'viem'
* const data = numberToBytes(420, { size: 4 })
* // Uint8Array([0, 0, 1, 164])
*/
export function numberToBytes(value, opts) {
const hex = numberToHex(value, opts);
return hexToBytes(hex);
}
/**
* Encodes a UTF-8 string into a byte array.
*
* - Docs: https://viem.sh/docs/utilities/toBytes#stringtobytes
*
* @param value String to encode.
* @param opts Options.
* @returns Byte array value.
*
* @example
* import { stringToBytes } from 'viem'
* const data = stringToBytes('Hello world!')
* // Uint8Array([72, 101, 108, 108, 111, 32, 119, 111, 114, 108, 100, 33])
*
* @example
* import { stringToBytes } from 'viem'
* const data = stringToBytes('Hello world!', { size: 32 })
* // Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
*/
export function stringToBytes(value, opts = {}) {
const bytes = encoder.encode(value);
if (typeof opts.size === 'number') {
assertSize(bytes, { size: opts.size });
return pad(bytes, { dir: 'right', size: opts.size });
}
return bytes;
}
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