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59 lines
2.0 KiB
59 lines
2.0 KiB
import { BaseError } from '../../errors/base.js';
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import { InvalidHexValueError, } from '../../errors/encoding.js';
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import { createCursor, } from '../cursor.js';
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import { hexToBytes } from './toBytes.js';
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import { bytesToHex } from './toHex.js';
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export function fromRlp(value, to = 'hex') {
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const bytes = (() => {
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if (typeof value === 'string') {
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if (value.length > 3 && value.length % 2 !== 0)
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throw new InvalidHexValueError(value);
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return hexToBytes(value);
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}
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return value;
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})();
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const cursor = createCursor(bytes, {
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recursiveReadLimit: Number.POSITIVE_INFINITY,
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});
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const result = fromRlpCursor(cursor, to);
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return result;
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}
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function fromRlpCursor(cursor, to = 'hex') {
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if (cursor.bytes.length === 0)
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return (to === 'hex' ? bytesToHex(cursor.bytes) : cursor.bytes);
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const prefix = cursor.readByte();
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if (prefix < 0x80)
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cursor.decrementPosition(1);
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// bytes
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if (prefix < 0xc0) {
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const length = readLength(cursor, prefix, 0x80);
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const bytes = cursor.readBytes(length);
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return (to === 'hex' ? bytesToHex(bytes) : bytes);
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}
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// list
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const length = readLength(cursor, prefix, 0xc0);
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return readList(cursor, length, to);
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}
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function readLength(cursor, prefix, offset) {
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if (offset === 0x80 && prefix < 0x80)
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return 1;
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if (prefix <= offset + 55)
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return prefix - offset;
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if (prefix === offset + 55 + 1)
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return cursor.readUint8();
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if (prefix === offset + 55 + 2)
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return cursor.readUint16();
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if (prefix === offset + 55 + 3)
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return cursor.readUint24();
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if (prefix === offset + 55 + 4)
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return cursor.readUint32();
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throw new BaseError('Invalid RLP prefix');
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}
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function readList(cursor, length, to) {
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const position = cursor.position;
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const value = [];
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while (cursor.position - position < length)
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value.push(fromRlpCursor(cursor, to));
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return value;
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}
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//# sourceMappingURL=fromRlp.js.map
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