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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/viem/_esm/utils/encoding
Просмотр файла: fromRlp.js
import { BaseError } from '../../errors/base.js';
import { InvalidHexValueError, } from '../../errors/encoding.js';
import { createCursor, } from '../cursor.js';
import { hexToBytes } from './toBytes.js';
import { bytesToHex } from './toHex.js';
export function fromRlp(value, to = 'hex') {
const bytes = (() => {
if (typeof value === 'string') {
if (value.length > 3 && value.length % 2 !== 0)
throw new InvalidHexValueError(value);
return hexToBytes(value);
}
return value;
})();
const cursor = createCursor(bytes, {
recursiveReadLimit: Number.POSITIVE_INFINITY,
});
const result = fromRlpCursor(cursor, to);
return result;
}
function fromRlpCursor(cursor, to = 'hex') {
if (cursor.bytes.length === 0)
return (to === 'hex' ? bytesToHex(cursor.bytes) : cursor.bytes);
const prefix = cursor.readByte();
if (prefix < 0x80)
cursor.decrementPosition(1);
// bytes
if (prefix < 0xc0) {
const length = readLength(cursor, prefix, 0x80);
const bytes = cursor.readBytes(length);
return (to === 'hex' ? bytesToHex(bytes) : bytes);
}
// list
const length = readLength(cursor, prefix, 0xc0);
return readList(cursor, length, to);
}
function readLength(cursor, prefix, offset) {
if (offset === 0x80 && prefix < 0x80)
return 1;
if (prefix <= offset + 55)
return prefix - offset;
if (prefix === offset + 55 + 1)
return cursor.readUint8();
if (prefix === offset + 55 + 2)
return cursor.readUint16();
if (prefix === offset + 55 + 3)
return cursor.readUint24();
if (prefix === offset + 55 + 4)
return cursor.readUint32();
throw new BaseError('Invalid RLP prefix');
}
function readList(cursor, length, to) {
const position = cursor.position;
const value = [];
while (cursor.position - position < length)
value.push(fromRlpCursor(cursor, to));
return value;
}
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Для локальной разработки. Не используйте в интернете!