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.