A streaming compression/decompression library which implements the LZ4BlockOutputStream format from lz4-java.
Beware: this format is not compatible with the standard LZ4 Block format. You should not use it unless you have some historical data compressed using the Java code.
This repository contains:
lz4jb: a library which implements theReadandWritetraits,- a command line tool to compress/decompress data in this format. The parameters are similar to
gzip,
Add this to your Cargo.toml:
[dependencies]
lz4jb = "0.1.0"Lz4BlockOutput is a wrapper around a type which implements the Write trait.
use lz4jb::Lz4BlockOutput;
use std::io::Write;
fn main() -> std::io::Result<()> {
let mut output = Vec::new(); // Vec<u8> implements the Write trait
Lz4BlockOutput::new(&mut output, 64)?
.write_all("...".as_bytes())?;
println!("{:?}", output);
Ok(())
}Lz4BlockInput is a wrapper around a type which implements the Read trait.
use lz4jb::Lz4BlockInput;
use std::io::Read;
const D: [u8; 24] = [
76, 90, 52, 66, 108, 111, 99, 107, 16, 3, 0, 0, 0, 3, 0, 0, 0, 82, 228, 119, 6, 46, 46, 46,
];
fn main() -> std::io::Result<()> {
let mut output = String::new();
Lz4BlockInput::new(&D[..]) // &[u8] implements the Read trait
.read_to_string(&mut output)?;
println!("{}", output);
Ok(())
}In the cli folder, there is a command line tool to compress and decompress using this library.
$ git clone https://github.com/trazfr/lz4jb
$ cd lz4jb
$ cargo install --path cli
...
$ lz4jb -h
lz4jb 0.1.0
A compression tool which implements the LZ4BlockOutputStream format from https://github.com/lz4/lz4-java.
This is not compatible with the standard LZ4 Block format.
USAGE:
lz4jb [FLAGS] [OPTIONS] [file]...
FLAGS:
-z, --compress Compress. This is the default operation mode.
-d, --decompress Decompress. [aliases: uncompress]
-l, --list List compressed file contents.
-t, --test Test the integrity of compressed files.
-f, --force Force the compression or decompression.
-k, --keep Keep (don't delete) input files during compression or decompression.
-c, --stdout Write to the standard output.
-h, --help Prints help information
-V, --version Prints version information
OPTIONS:
-b, --blocksize <blocksize> Block size for compression in bytes (between 64 and 33554432).
-E, --extension <extension> Append this extension instead of the default lz4 for compression.
-L, --library <library> Use an alternative library. See --help for the list of available libraries.
ARGS:
<file>... Sets the input file to use.See the LICENCE file.
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