bsdiff4 port for node.js

This port was derived from a number of sources including: the Python library bsdiff4 (https://github.com/ilanschnell/bsdiff4), which was itself derived from cx_bsdiff (http://cx-bsdiff.sf.net); the original BSD version BSDiff (http://www.daemonology.net/bsdiff); and the existing node.js port, node-bsdiff (https://github.com/mikepb/node-bsdiff).

This port implements the bsdiff and bspatch algorithms, but it does not parse or generate BSDIFF 4 patch files or provide compression. The functions exported operate on the raw control, diff and extra blocks. Operation is asynchronous.

Usage

var fs = require('fs');
var bsdiff4 = require('bsdiff4');

var origData = fs.readFileSync('oldfile');
var newData  = fs.readFileSync('newfile');

bsdiff4.diff(origData, newData, function(err, control, diff, extra) {
  bsdiff4.patch(origData, newData.length, control, diff, extra, function(err, out) {
    ...
  });
});

Functions

• bsdiff4.diff(origData, newData, callback) - generate a BSDiff patch

  • origData - a Buffer containing the original (source) data
  • newData - a Buffer containing the new (target) data
  • callback - a function to call once a patch has been generated
    • err - null on success,anError` object on error
    • control - an Array containing the control block
    • diffBlock - a Buffer containing the diff block
    • extraBlock - a Buffer containing the extra block

• bsdiff4.patch(origData, newDataLength, control, diffBlock, extraBlock, callback) - apply a BSDiff patch

  • origData - a Buffer containing the original (source) data
  • newDataLength - the size of the new (target) data in bytes
  • control - an Array of integers representing the control block
  • diffBlock - a Buffer containing the diff block
  • extraBlock - a Buffer containing the extra block
  • callback - a function to call once a patch has been applied
    • err - null on success, an Error object on error
    • out - a Buffer containing the new (target) data

Other versions

• node-bsdiff
• BSDiff
• bsdiff4
• cx_bsdiff