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Текущая директория: /opt/BitGoJS/node_modules/bitcoinjs-lib/src
Просмотр файла: push_data.js
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
exports.decode = exports.encode = exports.encodingLength = void 0;
const ops_1 = require('./ops');
/**
* Calculates the encoding length of a number used for push data in Bitcoin transactions.
* @param i The number to calculate the encoding length for.
* @returns The encoding length of the number.
*/
function encodingLength(i) {
return i < ops_1.OPS.OP_PUSHDATA1 ? 1 : i <= 0xff ? 2 : i <= 0xffff ? 3 : 5;
}
exports.encodingLength = encodingLength;
/**
* Encodes a number into a buffer using a variable-length encoding scheme.
* The encoded buffer is written starting at the specified offset.
* Returns the size of the encoded buffer.
*
* @param buffer - The buffer to write the encoded data into.
* @param num - The number to encode.
* @param offset - The offset at which to start writing the encoded buffer.
* @returns The size of the encoded buffer.
*/
function encode(buffer, num, offset) {
const size = encodingLength(num);
// ~6 bit
if (size === 1) {
buffer.writeUInt8(num, offset);
// 8 bit
} else if (size === 2) {
buffer.writeUInt8(ops_1.OPS.OP_PUSHDATA1, offset);
buffer.writeUInt8(num, offset + 1);
// 16 bit
} else if (size === 3) {
buffer.writeUInt8(ops_1.OPS.OP_PUSHDATA2, offset);
buffer.writeUInt16LE(num, offset + 1);
// 32 bit
} else {
buffer.writeUInt8(ops_1.OPS.OP_PUSHDATA4, offset);
buffer.writeUInt32LE(num, offset + 1);
}
return size;
}
exports.encode = encode;
/**
* Decodes a buffer and returns information about the opcode, number, and size.
* @param buffer - The buffer to decode.
* @param offset - The offset within the buffer to start decoding.
* @returns An object containing the opcode, number, and size, or null if decoding fails.
*/
function decode(buffer, offset) {
const opcode = buffer.readUInt8(offset);
let num;
let size;
// ~6 bit
if (opcode < ops_1.OPS.OP_PUSHDATA1) {
num = opcode;
size = 1;
// 8 bit
} else if (opcode === ops_1.OPS.OP_PUSHDATA1) {
if (offset + 2 > buffer.length) return null;
num = buffer.readUInt8(offset + 1);
size = 2;
// 16 bit
} else if (opcode === ops_1.OPS.OP_PUSHDATA2) {
if (offset + 3 > buffer.length) return null;
num = buffer.readUInt16LE(offset + 1);
size = 3;
// 32 bit
} 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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