Fast and memory saving bsdiff 4.x compatible delta compressor and patcher.
Add dependency to Cargo.toml:
[dependencies]
qbsdiff = "1.4"Build qbsdiff and qbspatch commands:
$ cargo build --release --bins --features cmd
$ cd target/release
$ ./qbsdiff --help
$ ./qbspatch --helpInstall commands to $CARGO_HOME/bin:
$ cargo install qbsdiff --features cmdProduce 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.