Golang LZ4 compression and decompression

README.md

Building

go build -o lz4 main.go

Compressing

cat file.txt | ./lz4 compress > file.txt.lz4

Decompressing

cat file.txt.lz4 | ./lz4 decompress > file.txt.bak

main.go

package main

import (
	"bufio"
	"io"
	"os"

	"github.com/pierrec/lz4"
	kingpin "gopkg.in/alecthomas/kingpin.v2"
)

var (
	app           = kingpin.New("lz4", "A command line tool for compressing files")
	compressCmd   = app.Command("compress", "Compress stdin")
	decompressCmd = app.Command("decompress", "Decompress stdin")
)

func main() {
	switch kingpin.MustParse(app.Parse(os.Args[1:])) {
	case compressCmd.FullCommand():
		compress()
	case decompressCmd.FullCommand():
		decompress()
	}
}

func compress() {
	bufWriter := bufio.NewWriter(os.Stdout)
	writer := lz4.NewWriter(bufWriter)
	writer.Header = lz4.Header{
		BlockDependency: false,
		BlockChecksum:   true,
		BlockMaxSize:    4 << 14,
		NoChecksum:      false,
		HighCompression: true,
	}

	io.Copy(writer, bufio.NewReaderSize(os.Stdin, 4*1024*1024))

	bufWriter.Flush()
	writer.Close()
}

func decompress() {
	io.Copy(os.Stdout, lz4.NewReader(os.Stdin))
}