@ecash/lib/dist/io/varsize.js

Library for eCash transaction building

"use strict";
// Copyright (c) 2024 The Bitcoin developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
Object.defineProperty(exports, "__esModule", { value: true });
exports.writeVarSize = exports.readVarSize = void 0;
/**
 * Read a VARINT, which encodes a size in the Bitcoin protocol, see:
 * https://en.bitcoin.it/wiki/Protocol_documentation#Variable_length_integer
 */
function readVarSize(bytes) {
    const firstByte = bytes.readU8();
    if (firstByte <= 0xfc) {
        return firstByte;
    }
    else if (firstByte == 0xfd) {
        return bytes.readU16();
    }
    else if (firstByte == 0xfe) {
        return bytes.readU32();
    }
    else if (firstByte == 0xff) {
        return bytes.readU64();
    }
    else {
        throw 'Unreachable';
    }
}
exports.readVarSize = readVarSize;
/**
 * Write a VARINT, which encodes a size in the Bitcoin protocol, see:
 * https://en.bitcoin.it/wiki/Protocol_documentation#Variable_length_integer
 * @param size Size integer to write
 * @param writer Writer to write the size to
 */
function writeVarSize(size, writer) {
    if (size <= 0xfc) {
        writer.putU8(size);
    }
    else if (size <= 0xffff) {
        writer.putU8(0xfd);
        writer.putU16(size);
    }
    else if (size <= 0xffffffff) {
        writer.putU8(0xfe);
        writer.putU32(size);
    }
    else if (size <= 0xffffffffffffffffn) {
        writer.putU8(0xff);
        writer.putU64(size);
    }
    else {
        throw 'Integer too big for VarSize';
    }
}
exports.writeVarSize = writeVarSize;
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