@okxweb3/coin-bitcoin
Version:
@ok/coin-bitcoin is a Bitcoin SDK for building Web3 wallets and applications. It supports BTC, BSV, DOGE, LTC, and TBTC, enabling private key management, transaction signing, address generation, and inscriptions like BRC-20, Runes, CAT, and Atomicals.
65 lines • 1.93 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.encode = exports.decode = void 0;
function decode(buffer, maxLength, minimal) {
maxLength = maxLength || 4;
minimal = minimal === undefined ? true : minimal;
const length = buffer.length;
if (length === 0)
return 0;
if (length > maxLength)
throw new TypeError('Script number overflow');
if (minimal) {
if ((buffer[length - 1] & 0x7f) === 0) {
if (length <= 1 || (buffer[length - 2] & 0x80) === 0)
throw new Error('Non-minimally encoded script number');
}
}
if (length === 5) {
const a = buffer.readUInt32LE(0);
const b = buffer.readUInt8(4);
if (b & 0x80)
return -((b & ~0x80) * 0x100000000 + a);
return b * 0x100000000 + a;
}
let result = 0;
for (let i = 0; i < length; ++i) {
result |= buffer[i] << (8 * i);
}
if (buffer[length - 1] & 0x80)
return -(result & ~(0x80 << (8 * (length - 1))));
return result;
}
exports.decode = decode;
function scriptNumSize(i) {
return i > 0x7fffffff
? 5
: i > 0x7fffff
? 4
: i > 0x7fff
? 3
: i > 0x7f
? 2
: i > 0x00
? 1
: 0;
}
function encode(_number) {
let value = Math.abs(_number);
const size = scriptNumSize(value);
const buffer = Buffer.allocUnsafe(size);
const negative = _number < 0;
for (let i = 0; i < size; ++i) {
buffer.writeUInt8(value & 0xff, i);
value >>= 8;
}
if (buffer[size - 1] & 0x80) {
buffer.writeUInt8(negative ? 0x80 : 0x00, size - 1);
}
else if (negative) {
buffer[size - 1] |= 0x80;
}
return buffer;
}
exports.encode = encode;
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