webbuf
v3.0.26
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Rust/WASM optimized buffers for the web, node.js, deno, and bun.
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WebBuf
WebBuf
is a powerful, flexible class that extends JavaScript's Uint8Array
to provide additional functionality for handling binary data. It includes
methods for manipulating binary data, converting to and from different formats
(e.g., base64, hex, strings), and reading/writing values in both little-endian
and big-endian formats. This library is ideal for applications that need
efficient and low-level control over binary data, like encoding/decoding or
working with protocols. It also supports "fixed-size" buffers with the
FixedBuf
class, which enforces a specific buffer size at compile-time.
Finally, the base64 and hex conversion methods are written in rust and built to WebAssembly for performance. They are about five times faster than pure JavaScript implementations for large data (~ 10 MB).
Features
- Extended
Uint8Array
with extra methods for binary manipulation. - Conversion methods: supports Base64, Hex, Strings, and arrays.
- Efficient concatenation and allocation methods.
- Clone and copy functionality for working with buffers.
- Support for reading and writing unsigned and signed integers in both Little Endian (LE) and Big Endian (BE) formats, including 8-bit, 16-bit, 32-bit, 64-bit, 128-bit, and 256-bit integers.
- Utility methods like
compare
,equals
,fill
, and more.
Installation
Install via npm:
npm install webbuf
Usage
Basic Usage
import { WebBuf } from "webbuf";
// Allocating a buffer
const buf = WebBuf.alloc(10);
// Filling the buffer
buf.fill(0);
// Working with base64
const base64Str = buf.toBase64();
const decodedBuf = WebBuf.fromBase64(base64Str);
// Cloning a buffer
const clonedBuf = buf.clone();
// Comparing buffers
const anotherBuf = WebBuf.alloc(10);
console.log(buf.equals(anotherBuf)); // false
Conversion Examples
String to WebBuf:
const buf = WebBuf.fromString("Hello, World!"); console.log(buf.toString()); // Outputs: Hello, World!
Hex to WebBuf:
const hexBuf = WebBuf.fromHex("48656c6c6f"); console.log(hexBuf.toString()); // Outputs: Hello
Base64 to WebBuf:
const base64Buf = WebBuf.fromBase64("SGVsbG8="); console.log(base64Buf.toString()); // Outputs: Hello
Reading and Writing Data
Read/Write Integers:
const buf = WebBuf.alloc(8); // Writing a 32-bit little-endian integer buf.writeUint32LE(123456, 0); // Reading the value back const val = buf.readUint32LE(0); console.log(val); // Outputs: 123456
Working with BigInt:
const buf = WebBuf.alloc(16); // Writing a 128-bit little-endian BigInt buf.writeBigUint128LE(0x1234567890abcdef1234567890abcdefn, 0); // Reading the value back const bigVal = buf.readBigUint128LE(0); console.log(bigVal.toString(16)); // Outputs: 1234567890abcdef1234567890abcdef
API Reference
Static Methods
WebBuf.concat(list: Uint8Array[]): WebBuf
Concatenates a list ofUint8Array
orWebBuf
into a singleWebBuf
.WebBuf.alloc(size: number): WebBuf
Allocates a newWebBuf
of the specified size.WebBuf.fromUint8Array(buffer: Uint8Array): WebBuf
Returns aWebBuf
that is a view of the same data as the inputUint8Array
.WebBuf.fromArray(array: number[]): WebBuf
Creates aWebBuf
from an array of numbers.WebBuf.fromString(str: string): WebBuf
Converts a string into aWebBuf
.WebBuf.fromHex(hex: string): WebBuf
Converts a hex string to aWebBuf
.WebBuf.fromBase64(b64: string): WebBuf
Converts a base64 string into aWebBuf
.WebBuf.from(source, mapFn?, thisArg?): WebBuf
Overrides theUint8Array.from
method to return aWebBuf
.
Instance Methods
toBase64(): string
Converts theWebBuf
to a base64 string.toString(): string
Converts theWebBuf
to a UTF-8 string.toHex(): string
Converts theWebBuf
to a hexadecimal string.toArray(): number[]
Converts theWebBuf
to a standard array of numbers.clone(): WebBuf
Returns a copy of theWebBuf
.compare(other: WebBuf): number
Compares two buffers lexicographically. Returns0
if equal,-1
ifthis
is smaller, or1
ifthis
is larger.equals(other: WebBuf): boolean
Returnstrue
if the contents of two buffers are identical.copy(target: WebBuf, targetStart?: number, sourceStart?: number, sourceEnd?: number): number
Copies a section ofWebBuf
data to anotherWebBuf
.
Reading/Writing Numbers
Read and write unsigned integers (8-bit, 16-bit, 32-bit, 64-bit, 128-bit, 256-bit) in both Little Endian (LE) and Big Endian (BE) formats:
readUintLE
,readUintBE
readUint8
,readUint16LE
,readUint16BE
readUint32LE
,readUint32BE
readBigUint64LE
,readBigUint64BE
writeUintLE
,writeUintBE
,writeBigUint64LE
,writeBigUint64BE
writeBigUint128LE
,writeBigUint128BE
writeBigUint256LE
,writeBigUint256BE
Read and write signed integers in both Little Endian and Big Endian formats:
readIntLE
,readIntBE
readInt8
,readInt16LE
,readInt16BE
readInt32LE
,readInt32BE
readBigInt64LE
,readBigInt64BE
readBigInt128LE
,readBigInt128BE
readBigInt256LE
,readBigInt256BE
FixedBuf
FixedBuf
The FixedBuf
class is a specialized extension of the WebBuf
class designed
to manage buffers with a fixed size at compile-time. This class provides a way
to work with fixed-size buffers in TypeScript, ensuring that the size of the
buffer is known and enforced by the type system. It also offers various
utilities for creating, encoding, and cloning fixed-size buffers, while
retaining all the powerful features of WebBuf
.
Features:
- Fixed Size:
FixedBuf
enforces the buffer size at both runtime and compile-time, ensuring that all operations adhere to the specified buffer size. - Flexible Construction: You can create a
FixedBuf
from existing buffers, random data, hexadecimal strings, or Base64-encoded strings. - Serialization Support: Convert buffers to/from hexadecimal and Base64 formats.
- Cloning: Create deep copies of fixed-size buffers.
Constructor
constructor(size: N, buf: WebBuf)
Creates a new FixedBuf
of size N
, wrapping around an existing WebBuf
instance. The size is enforced at runtime, ensuring that the provided WebBuf
matches the fixed size.
Methods
buf: WebBuf
Returns the underlyingWebBuf
instance.get buf(): WebBuf;
Static Methods
fromBuf<N>(size: N, buf: WebBuf): FixedBuf<N>
Creates aFixedBuf
from an existingWebBuf
of a specific size.const fixedBuf = FixedBuf.fromBuf(32, someWebBuf);
alloc<N>(size: N, fill?: number): FixedBuf<N>
Allocates a newFixedBuf
of a fixed size, optionally filled with the specified value. If no value is provided, the buffer will be initialized with zeros.const buf = FixedBuf.alloc(16, 0xff); // 16-byte buffer filled with 0xff
fromHex<N>(size: N, hex: string): FixedBuf<N>
Creates aFixedBuf
of a specific size from a hexadecimal string. The hex string must match the required length of the buffer.const buf = FixedBuf.fromHex(16, "deadbeefcafebabe...");
fromBase64(size: number, base64: string): FixedBuf<number>
Creates aFixedBuf
from a Base64-encoded string. The size of the resulting buffer is determined by thesize
parameter.const buf = FixedBuf.fromBase64(16, "SGVsbG8gd29ybGQ=");
fromRandom<N>(size: N): FixedBuf<N>
Creates aFixedBuf
of the given size filled with cryptographically secure random bytes.const buf = FixedBuf.fromRandom(16);
Instance Methods
toHex(): string
Converts theFixedBuf
to a hexadecimal string representation.const hex = fixedBuf.toHex();
toBase64(): string
Converts theFixedBuf
to a Base64-encoded string.const base64 = fixedBuf.toBase64();
clone(): FixedBuf<N>
Creates a deep copy of theFixedBuf
.const clonedBuf = fixedBuf.clone();
Example Usage
import { WebBuf, FixedBuf } from "webbuf";
// Allocate a FixedBuf of 32 bytes filled with 0x00
const buf = FixedBuf.alloc(32);
// Create a FixedBuf from a hexadecimal string
const hexBuf = FixedBuf.fromHex(16, "deadbeefcafebabe1234567890abcdef");
// Clone the buffer
const clonedBuf = hexBuf.clone();
// Convert to Base64
const base64String = buf.toBase64();
The FixedBuf
class provides a robust way to manage fixed-size buffers with
added functionality like encoding, randomization, and type enforcement, making
it a powerful complement to the WebBuf
class for specialized use cases where
buffer size consistency is crucial.
Contributing
Contributions are welcome! Please feel free to submit pull requests or open issues for any improvements or bugs.
License
This project is licensed under the MIT License.