viem
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JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.fromRlp = fromRlp;
const base_js_1 = require("../../errors/base.js");
const encoding_js_1 = require("../../errors/encoding.js");
const cursor_js_1 = require("../cursor.js");
const toBytes_js_1 = require("./toBytes.js");
const toHex_js_1 = require("./toHex.js");
function fromRlp(value, to = 'hex') {
const bytes = (() => {
if (typeof value === 'string') {
if (value.length > 3 && value.length % 2 !== 0)
throw new encoding_js_1.InvalidHexValueError(value);
return (0, toBytes_js_1.hexToBytes)(value);
}
return value;
})();
const cursor = (0, cursor_js_1.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' ? (0, toHex_js_1.bytesToHex)(cursor.bytes) : cursor.bytes);
const prefix = cursor.readByte();
if (prefix < 0x80)
cursor.decrementPosition(1);
if (prefix < 0xc0) {
const length = readLength(cursor, prefix, 0x80);
const bytes = cursor.readBytes(length);
return (to === 'hex' ? (0, toHex_js_1.bytesToHex)(bytes) : bytes);
}
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 base_js_1.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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