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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/viem/_esm/utils/encoding
Просмотр файла: fromHex.js

import { InvalidHexBooleanError, SizeOverflowError, } from '../../errors/encoding.js';
import { size as size_ } from '../data/size.js';
import { trim } from '../data/trim.js';
import { hexToBytes } from './toBytes.js';
export function assertSize(hexOrBytes, { size }) {
    if (size_(hexOrBytes) > size)
        throw new SizeOverflowError({
            givenSize: size_(hexOrBytes),
            maxSize: size,
        });
}
/**
 * Decodes a hex string into a string, number, bigint, boolean, or byte array.
 *
 * - Docs: https://viem.sh/docs/utilities/fromHex
 * - Example: https://viem.sh/docs/utilities/fromHex#usage
 *
 * @param hex Hex string to decode.
 * @param toOrOpts Type to convert to or options.
 * @returns Decoded value.
 *
 * @example
 * import { fromHex } from 'viem'
 * const data = fromHex('0x1a4', 'number')
 * // 420
 *
 * @example
 * import { fromHex } from 'viem'
 * const data = fromHex('0x48656c6c6f20576f726c6421', 'string')
 * // 'Hello world'
 *
 * @example
 * import { fromHex } from 'viem'
 * const data = fromHex('0x48656c6c6f20576f726c64210000000000000000000000000000000000000000', {
 *   size: 32,
 *   to: 'string'
 * })
 * // 'Hello world'
 */
export function fromHex(hex, toOrOpts) {
    const opts = typeof toOrOpts === 'string' ? { to: toOrOpts } : toOrOpts;
    const to = opts.to;
    if (to === 'number')
        return hexToNumber(hex, opts);
    if (to === 'bigint')
        return hexToBigInt(hex, opts);
    if (to === 'string')
        return hexToString(hex, opts);
    if (to === 'boolean')
        return hexToBool(hex, opts);
    return hexToBytes(hex, opts);
}
/**
 * Decodes a hex value into a bigint.
 *
 * - Docs: https://viem.sh/docs/utilities/fromHex#hextobigint
 *
 * @param hex Hex value to decode.
 * @param opts Options.
 * @returns BigInt value.
 *
 * @example
 * import { hexToBigInt } from 'viem'
 * const data = hexToBigInt('0x1a4', { signed: true })
 * // 420n
 *
 * @example
 * import { hexToBigInt } from 'viem'
 * const data = hexToBigInt('0x00000000000000000000000000000000000000000000000000000000000001a4', { size: 32 })
 * // 420n
 */
export function hexToBigInt(hex, opts = {}) {
    const { signed } = opts;
    if (opts.size)
        assertSize(hex, { size: opts.size });
    const value = BigInt(hex);
    if (!signed)
        return value;
    const size = (hex.length - 2) / 2;
    const max = (1n << (BigInt(size) * 8n - 1n)) - 1n;
    if (value <= max)
        return value;
    return value - BigInt(`0x${'f'.padStart(size * 2, 'f')}`) - 1n;
}
/**
 * Decodes a hex value into a boolean.
 *
 * - Docs: https://viem.sh/docs/utilities/fromHex#hextobool
 *
 * @param hex Hex value to decode.
 * @param opts Options.
 * @returns Boolean value.
 *
 * @example
 * import { hexToBool } from 'viem'
 * const data = hexToBool('0x01')
 * // true
 *
 * @example
 * import { hexToBool } from 'viem'
 * const data = hexToBool('0x0000000000000000000000000000000000000000000000000000000000000001', { size: 32 })
 * // true
 */
export function hexToBool(hex_, opts = {}) {
    let hex = hex_;
    if (opts.size) {
        assertSize(hex, { size: opts.size });
        hex = trim(hex);
    }
    if (trim(hex) === '0x00')
        return false;
    if (trim(hex) === '0x01')
        return true;
    throw new InvalidHexBooleanError(hex);
}
/**
 * Decodes a hex string into a number.
 *
 * - Docs: https://viem.sh/docs/utilities/fromHex#hextonumber
 *
 * @param hex Hex value to decode.
 * @param opts Options.
 * @returns Number value.
 *
 * @example
 * import { hexToNumber } from 'viem'
 * const data = hexToNumber('0x1a4')
 * // 420
 *
 * @example
 * import { hexToNumber } from 'viem'
 * const data = hexToBigInt('0x00000000000000000000000000000000000000000000000000000000000001a4', { size: 32 })
 * // 420
 */
export function hexToNumber(hex, opts = {}) {
    return Number(hexToBigInt(hex, opts));
}
/**
 * Decodes a hex value into a UTF-8 string.
 *
 * - Docs: https://viem.sh/docs/utilities/fromHex#hextostring
 *
 * @param hex Hex value to decode.
 * @param opts Options.
 * @returns String value.
 *
 * @example
 * import { hexToString } from 'viem'
 * const data = hexToString('0x48656c6c6f20576f726c6421')
 * // 'Hello world!'
 *
 * @example
 * import { hexToString } from 'viem'
 * const data = hexToString('0x48656c6c6f20576f726c64210000000000000000000000000000000000000000', {
 *  size: 32,
 * })
 * // 'Hello world'
 */
export function hexToString(hex, opts = {}) {
    let bytes = hexToBytes(hex);
    if (opts.size) {
        assertSize(bytes, { size: opts.size });
        bytes = trim(bytes, { dir: 'right' });
    }
    return new TextDecoder().decode(bytes);
}
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