qbsdiff

快速且节省内存的与 bsdiff 4.x 兼容的增量压缩器和修补工具。

将依赖项添加到 Cargo.toml

[dependencies]
qbsdiff = "1.4"

构建命令

构建 qbsdiff 和 qbspatch 命令

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

安装命令到 $CARGO_HOME/bin

$ cargo install qbsdiff --features cmd

示例

通过将 patch 应用于 source 来生成目标流

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)
}

通过比较 source 和 target 来生成补丁数据

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)
}

请注意，qbsdiff 不会生成与 bsdiff 完全相同的补丁文件。仅保证补丁文件格式兼容。