bsdiff-rs

Bsdiff是一种文件差异比较的方法。这个crate是将bsdiff库移植到Rust。高性能的补丁。全部使用安全的Rust编写。

通常，与bzip2之类的压缩算法一起使用bsdiff是个不错的选择。

使用方法

fn main() {
    let one = vec![1, 2, 3, 4, 5];
    let two = vec![1, 2, 4, 6];
    let mut patch = Vec::new();

    bsdiff::diff(&one, &two, &mut patch).unwrap();

    let mut patched = Vec::with_capacity(two.len());
    bsdiff::patch(&one, &mut patch.as_slice(), &mut patched).unwrap();
    assert_eq!(patched, two);
}

文件比较

fn diff_files(file_a: &str, file_b: &str, patch_file: &str) -> std::io::Result<()> {
    let old = std::fs::read(file_a)?;
    let new = std::fs::read(file_b)?;
    let mut patch = Vec::new();

    bsdiff::diff(&old, &new, &mut patch)?;
    // TODO: compress `patch` here
    std::fs::write(patch_file, &patch)
}

文件修补

fn patch_file(file_a: &str, patch_file: &str, file_b: &str) -> std::io::Result<()> {
    let old = std::fs::read(file_a)?;
    let patch = std::fs::read(patch_file)?;
    // TODO: decompress `patch` here
    let mut new = Vec::new();

    bsdiff::patch(&old, &mut patch.as_slice(), &mut new)?;
    std::fs::write(file_b, &new)
}