bsdiff-wasm

bsdiff/bspatch compiled to WebAssembly.

This is a rebuild of bsdiff (4.3-23) maintained by debian and is fully compatible. The original was developed by Colin Percival. Please see http://www.daemonology.net/bsdiff/.

Demo: https://kairi003.github.io/bsdiff-wasm/

Install

npm install bsdiff-wasm

or use any CDN service like https://unpkg.com/bsdiff-wasm

Usage

Examples of an operation equivalent to bsdiff old.bin new.bin patch.bsdiff.

For more information, see test, docs or demo page.

browser

<script type="module">
  import { loadBsdiff, loadBspatch } from 'https://unpkg.com/bsdiff-wasm';
  const bsdiff = await loadBsdiff();
  await fetch('./old.bin')
    .then(res => res.arrayBuffer())
    .then(buf => bsdiff.FS.writeFile('old.bin', new Uint8Array(buf)));
  await fetch('./new.bin')
    .then(res => res.arrayBuffer())
    .then(buf => bsdiff.FS.writeFile('new.bin', new Uint8Array(buf)));
  bsdiff.callMain(['old.bin', 'new.bin', 'patch.bsdiff']);
  const patch = bsdiff.FS.readFile('patch.bsdiff');
  console.log(patch);
</script>

node.js

import { loadBsdiff, loadBspatch } from 'bsdiff-wasm';
const bsdiff = await loadBsdiff();
const workdir = '/working';
bsdiff.FS.mkdir(workdir);
bsdiff.FS.mount(bsdiff.NODEFS, { root: process.cwd() }, workdir);
bsdiff.FS.chdir(workdir);
bsdiff.callMain(['old.bin', 'new.bin', 'patch.bsdiff']);

Build

Some commands need to be modified for windows because it is designed for bash.

shell

git submodule update --init --recursive
docker build -t bsdiff-wasm-build .
docker run --rm -v $PWD:/src -u $(id -u):$(id -g) -w /src bsdiff-wasm-build /bin/bash build.sh
bash postbuild.sh

npm

git submodule update --init --recursive
npm install

Test

Probably cross-platform.

npm test