GitHub - hucsmn/qbsdiff: fast and memory saving bsdiff 4.x compatible delta compressor and patcher (original) (raw)

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> { 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> { 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.