zt: the transparent io.Reader for compressed data

Package zt provides a type implementing the io.ReadCloser interface, that transparently uncompresses a stream of compressed bytes. zt detects the compression algorithm from the stream header, creates that appropriate decompressor. In case the incoming data is not compressed, or if the compression algorithm is unknown or unsupported, bytes are simply forwarded as-is.

Supported compression algorithms are:

• Zstandard
• Gzip
• Bzip2
• zlib

Example, a transparent decompressor.

package main

import (
	"io"
	"os"

	"github.com/arl/zt"
)

func main() {
	r, err := zt.NewReader(os.Stdin)
	if err != nil { /* handle error */ }
	defer r.Close()

	_, err = io.Copy(os.Stdout, r)
	if err != nil { /* handle error */ }
}

go run main.go < /some/file.gz  # decompress gzip-compressed file to stdout
go run main.go < /some/file.zst # decompress zstandard-compressed file to stdout
go run main.go < /some/file.bz2 # decompress bzip2-compressed file to stdout
go run main.go < /some/file.zz  # decompress zlib-compressed file to stdout
go run main.go < /some/file     # print non-compressed file to stdout