qbsdiff

Fast and memory saving bsdiff 4.x compatible delta compressor and patcher.

Add dependency to Cargo.toml:

[dependencies]
qbsdiff = "1.4"

Build commands

Build qbsdiff and qbspatch commands:

$ cargo build --release --bins --features cmd
$ cd target/release
$ ./qbsdiff --help
$ ./qbspatch --help

Install commands to $CARGO_HOME/bin:

$ cargo install qbsdiff --features cmd

Examples

Produce the target stream by applying patch to source:

use std::io;
use qbsdiff::Bspatch;

fn bspatch(source: &[u8], patch: &[u8]) -> io::Result<Vec<u8>> {
    let patcher = Bspatch::new(patch)?;
    let mut target = Vec::new();
    // To preallocate target:
    //Vec::with_capacity(patcher.hint_target_size() as usize);
    patcher.apply(source, io::Cursor::new(&mut target))?;
    Ok(target)
}

Produce the patch data by comparing source with target:

use std::io;
use qbsdiff::Bsdiff;

fn bsdiff(source: &[u8], target: &[u8]) -> io::Result<Vec<u8>> {
    let mut patch = Vec::new();
    Bsdiff::new(source, target)
        .compare(io::Cursor::new(&mut patch))?;
    Ok(patch)
}

Note that qbsdiff would not generate exactly the same patch file as bsdiff. Only the patch file format is promised to be compatible.