Golang : Decompress zlib file example
Continuation from previous tutorial on how to zlib compress a file. In this part, we will learn how to decompress a file that was compressed with zlib compression algorithm.
Here are the codes :
package main
import (
"compress/zlib"
"flag"
"fmt"
"io"
"os"
"strings"
)
func main() {
flag.Parse() // get the arguments from command line
filename := flag.Arg(0)
if filename == "" {
fmt.Println("Usage : unzlib sourcefile.zlib")
os.Exit(1)
}
zlibfile, err := os.Open(filename)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
reader, err := zlib.NewReader(zlibfile)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer reader.Close()
newfilename := strings.TrimSuffix(filename, ".zlib")
writer, err := os.Create(newfilename)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer writer.Close()
if _, err = io.Copy(writer, reader); err != nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Println("Decompressed to ", newfilename)
}
Sample output :
./unzlib uncompressed.txt.zlib
Decompressed to uncompressed.txt
./unzlib
Usage : unzlib sourcefile.zlib
References :
http://golang.org/pkg/compress/zlib/
https://www.socketloop.com/tutorials/golang-zlib-compress-file-example
See also : Golang : zlib compress file example
By Adam Ng
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