mutable-buffer

A mutable buffer library for both node.js and browser

Install

$ npm install mutable-buffer

Usage

Basic usage

const {MutableBuffer} = require('mutable-buffer');

const buffer = new MutableBuffer(/* initialSize, blockSize */);

// use it like node Buffer
buffer.writeUInt8(8);
buffer.writeUInt16LE(0x1234);

buffer.write('hello');
buffer.write(otherBuffer);

// write a string to the buffer utf8 encoded and adds a null character (\0) at the end.
buffer.writeCString('hello');

// write a char
buffer.writeChar('a');

// get size of mutable buffer
buffer.size();

// get current capacity of mutable buffer
buffer.capacity();

// return a sliced Buffer instance
result = buffer.render();

// return a fresh Buffer instance
result = buffer.render(true);

// or return a sliced Buffer instance and clear buffer
result = buffer.flush();

// or return a fresh Buffer instance and clear buffer
result = buffer.flush(true);

// clear manual
buffer.clear();

Trim null characters

const {MutableBuffer} = require('mutable-buffer');

const buffer = new MutableBuffer(/* initialSize, blockSize */);

// trimLeft
buffer.write([0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00]);
buffer.trimLeft().flush(); // => [0x01, 0x02, 0x00, 0x00, 0x00]

// trimRight
buffer.write([0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00]);
buffer.trimRight().flush(); // => [0x00, 0x00, 0x01, 0x02]

// trim
buffer.write([0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x00]);
buffer.trim().flush(); // => [0x01, 0x02]

Use in browser

mutable-buffer introduced feross/buffer to support for the browser out of box in v3.0.

A front-end packaging tool like webpack will recognize the browser entry defined in pacakge.json and use the browser version of mutable-buffer by default.

You can print MutableBuffer.target to confirm that.

// in node
console.log(MutableBuffer.target); // => 'node'

// in browser
console.log(MutableBuffer.target); // => 'web'