JSBinaryUtils

A high-performance TypeScript library for binary data manipulation in Node.js applications. JSBinaryUtils provides efficient buffer management without the overhead of repeated allocations, making it ideal for real-time applications and network protocols.

Features

• Zero-copy operations - Optimized buffer management with automatic capacity growth
• Comprehensive API - Read/write support for all standard binary data types
• Variable-length encoding - Built-in VarInt and VarLong support
• Endianness control - Big-endian and little-endian operations
• Type-safe - Full TypeScript support with type definitions
• Well-tested - Extensive test coverage

Installation

npm install @jsprismarine/jsbinaryutils

Quick Start

Reading Binary Data

import BinaryStream from '@jsprismarine/jsbinaryutils';

const buffer = Buffer.from([0xFF, 0x00, 0x7F, 0x80]);
const stream = new BinaryStream(buffer);

const byte = stream.readByte();           // 255
const signed = stream.readSignedByte();   // 0
const short = stream.readShort();         // 32640

Writing Binary Data

import BinaryStream from '@jsprismarine/jsbinaryutils';

const stream = new BinaryStream();

stream.writeByte(255);
stream.writeShort(32640);
stream.writeVarInt(12345);

const result = stream.getWriteBuffer();

API Overview

Byte Operations

• readByte() / writeByte(v) - Unsigned byte (0-255)
• readSignedByte() / writeSignedByte(v) - Signed byte (-128 to 127)
• readBoolean() / writeBoolean(v) - Boolean value

Integer Operations

• readShort() / writeShort(v) - 16-bit signed integer (BE)
• readShortLE() / writeShortLE(v) - 16-bit signed integer (LE)
• readUnsignedShort() / writeUnsignedShort(v) - 16-bit unsigned integer (BE)
• readInt() / writeInt(v) - 32-bit signed integer (BE)
• readUnsignedInt() / writeUnsignedInt(v) - 32-bit unsigned integer (BE)

Triad Operations (24-bit)

• readTriad() / writeTriad(v) - 24-bit signed integer (BE)
• readTriadLE() / writeTriadLE(v) - 24-bit signed integer (LE)
• readUnsignedTriad() / writeUnsignedTriad(v) - 24-bit unsigned integer (BE)

Floating Point Operations

• readFloat() / writeFloat(v) - 32-bit float (BE)
• readFloatLE() / writeFloatLE(v) - 32-bit float (LE)
• readDouble() / writeDouble(v) - 64-bit double (BE)
• readDoubleLE() / writeDoubleLE(v) - 64-bit double (LE)

Long Operations (64-bit)

• readLong() / writeLong(v) - 64-bit signed BigInt (BE)
• readLongLE() / writeLongLE(v) - 64-bit signed BigInt (LE)
• readUnsignedLong() / writeUnsignedLong(v) - 64-bit unsigned BigInt (BE)

Variable-Length Operations

• readVarInt() / writeVarInt(v) - 32-bit zigzag-encoded VarInt
• readUnsignedVarInt() / writeUnsignedVarInt(v) - 32-bit unsigned VarInt
• readVarLong() / writeVarLong(v) - 64-bit zigzag-encoded VarLong
• readUnsignedVarLong() / writeUnsignedVarLong(v) - 64-bit unsigned VarLong

Buffer Operations

• read(length) - Read raw bytes
• write(buffer) - Write raw bytes
• skip(length) - Skip bytes
• readRemaining() - Read all remaining bytes
• getReadBuffer() / getWriteBuffer() - Get underlying buffers

Stream Management

• setReadBuffer(buffer, index?) - Set read buffer
• setWriteBuffer(buffer, index?) - Set write buffer
• getReadIndex() / setReadIndex(index) - Manage read position
• getWriteIndex() / setWriteIndex(index) - Manage write position
• clear() - Reset stream
• reuse(buffer) - Reuse stream with new buffer
• feof() - Check end of buffer

Documentation

Full API documentation with detailed method descriptions and examples is available at: https://jsprismarine.github.io/JSBinaryUtils/

Performance

JSBinaryUtils uses a dynamic buffer allocation strategy that minimizes memory overhead:

• Initial allocation: 256 bytes or required size
• Growth strategy: 2x current capacity when needed
• No intermediate allocations during writes

This approach significantly outperforms naive Buffer.concat() operations in high-throughput scenarios.

License

ISC

Contributing

Contributions are welcome. Please open an issue or submit a pull request on GitHub.