Golang : Compress and decompress file with compress/flate example
Tags : golang deflate compress flate
A quick and simple tutorial on how to compress a file with Golang's compress/flate
package. Package flate implements the DEFLATE compressed data format, as described in RFC 1951.
To compress a file, pipe and flush the data out with NewWriter()
function :
package main
import (
"compress/flate"
"fmt"
"io"
"os"
)
func main() {
inputFile, err := os.Open("file.txt")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer inputFile.Close()
outputFile, err := os.Create("file.txt.compressed")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer outputFile.Close()
flateWriter, err := flate.NewWriter(outputFile, flate.BestCompression)
if err != nil {
fmt.Println("NewWriter error ", err)
os.Exit(1)
}
defer flateWriter.Close()
io.Copy(flateWriter, inputFile)
flateWriter.Flush()
}
Sample test data :
>cat file.txt
This is a test file for Golang Compress/Flate
This is a test file for Golang Compress/Flate
This is a test file for Golang Compress/Flate
This is a test file for Golang Compress/Flate
This is a test file for Golang Compress/Flate
This is a test file for Golang Compress/Flate
>cat file.txt.compressed
��,V�D������T���"��ļt��܂���b}��ĒT�Q�#U5����
To decompress the file, read in the compressed data with NewReader()
function before piping out the decompressed data to file
package main
import (
"compress/flate"
"fmt"
"io"
"os"
)
func main() {
inputFile, err := os.Open("file.txt.compressed")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer inputFile.Close()
outputFile, err := os.Create("file.txt.decompressed")
if err != nil {
fmt.Println(err)
os.Exit(1)
}
defer outputFile.Close()
flateReader := flate.NewReader(inputFile)
defer flateReader.Close()
io.Copy(outputFile, flateReader)
}
Happy coding!
Reference :
See also : Golang : Gzip file example
Tags : golang deflate compress flate
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+2.1k Golang : Example of custom handler for Gorilla's Path usage.
+15.4k Golang : How to check if slice or array is empty?
+12.2k Golang : missing Mercurial command
108 Golang : Fixing Gorilla mux http.FileServer() 404 problem
+1.5k Golang : Reclaim memory occupied by make() example
+3.8k Swift : Convert (cast) String to Float
+9.9k nginx: [emerg] unknown directive "passenger_enabled"
+1.6k Fix Google Analytics Redundant Hostnames problem
+7k Golang : Convert PNG transparent background image to JPG or JPEG image
+16.8k Golang : Convert []string to []byte examples
+14.5k Golang : Example for ECDSA(Elliptic Curve Digital Signature Algorithm) package functions
+45.2k Golang : Convert HTTP Response body to string