@okxweb3/coin-bitcoin
Version:
@okxweb3/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
64 lines • 1.86 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.decode = exports.encode = exports.encodingLength = void 0;
const ops_1 = require("./ops");
function encodingLength(i) {
return i < ops_1.OPS.OP_PUSHDATA1 ? 1 : i <= 0xff ? 2 : i <= 0xffff ? 3 : 5;
}
exports.encodingLength = encodingLength;
function encode(buffer, num, offset) {
const size = encodingLength(num);
if (size === 1) {
buffer.writeUInt8(num, offset);
}
else if (size === 2) {
buffer.writeUInt8(ops_1.OPS.OP_PUSHDATA1, offset);
buffer.writeUInt8(num, offset + 1);
}
else if (size === 3) {
buffer.writeUInt8(ops_1.OPS.OP_PUSHDATA2, offset);
buffer.writeUInt16LE(num, offset + 1);
}
else {
buffer.writeUInt8(ops_1.OPS.OP_PUSHDATA4, offset);
buffer.writeUInt32LE(num, offset + 1);
}
return size;
}
exports.encode = encode;
function decode(buffer, offset) {
const opcode = buffer.readUInt8(offset);
let num;
let size;
if (opcode < ops_1.OPS.OP_PUSHDATA1) {
num = opcode;
size = 1;
}
else if (opcode === ops_1.OPS.OP_PUSHDATA1) {
if (offset + 2 > buffer.length)
return null;
num = buffer.readUInt8(offset + 1);
size = 2;
}
else if (opcode === ops_1.OPS.OP_PUSHDATA2) {
if (offset + 3 > buffer.length)
return null;
num = buffer.readUInt16LE(offset + 1);
size = 3;
}
else {
if (offset + 5 > buffer.length)
return null;
if (opcode !== ops_1.OPS.OP_PUSHDATA4)
throw new Error('Unexpected opcode');
num = buffer.readUInt32LE(offset + 1);
size = 5;
}
return {
opcode,
number: num,
size,
};
}
exports.decode = decode;
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