@okxweb3/coin-bitcoin/dist/bitcoinjs-lib/varuint.js

@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

'use strict';
var Buffer = require('safe-buffer').Buffer;
var MAX_SAFE_INTEGER = 9007199254740991;
function checkUInt53(n) {
    if (n < 0 || n > MAX_SAFE_INTEGER || n % 1 !== 0)
        throw new RangeError('value out of range');
}
function encode(number, buffer, offset) {
    checkUInt53(number);
    if (!buffer)
        buffer = Buffer.allocUnsafe(encodingLength(number));
    if (!Buffer.isBuffer(buffer))
        throw new TypeError('buffer must be a Buffer instance');
    if (!offset)
        offset = 0;
    if (number < 0xfd) {
        buffer.writeUInt8(number, offset);
        encode.bytes = 1;
    }
    else if (number <= 0xffff) {
        buffer.writeUInt8(0xfd, offset);
        buffer.writeUInt16LE(number, offset + 1);
        encode.bytes = 3;
    }
    else if (number <= 0xffffffff) {
        buffer.writeUInt8(0xfe, offset);
        buffer.writeUInt32LE(number, offset + 1);
        encode.bytes = 5;
    }
    else {
        buffer.writeUInt8(0xff, offset);
        buffer.writeUInt32LE(number >>> 0, offset + 1);
        buffer.writeUInt32LE((number / 0x100000000) | 0, offset + 5);
        encode.bytes = 9;
    }
    return buffer;
}
function decode(buffer, offset) {
    if (!Buffer.isBuffer(buffer))
        throw new TypeError('buffer must be a Buffer instance');
    if (!offset)
        offset = 0;
    var first = buffer.readUInt8(offset);
    if (first < 0xfd) {
        decode.bytes = 1;
        return first;
    }
    else if (first === 0xfd) {
        decode.bytes = 3;
        return buffer.readUInt16LE(offset + 1);
    }
    else if (first === 0xfe) {
        decode.bytes = 5;
        return buffer.readUInt32LE(offset + 1);
    }
    else {
        decode.bytes = 9;
        var lo = buffer.readUInt32LE(offset + 1);
        var hi = buffer.readUInt32LE(offset + 5);
        var number = hi * 0x0100000000 + lo;
        checkUInt53(number);
        return number;
    }
}
function encodingLength(number) {
    checkUInt53(number);
    return (number < 0xfd ? 1
        : number <= 0xffff ? 3
            : number <= 0xffffffff ? 5
                : 9);
}
module.exports = { encode: encode, decode: decode, encodingLength: encodingLength };
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