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January 16, 2017 13:50
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golang: gzip and gunzip
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package main | |
import ( | |
"bytes" | |
"compress/gzip" | |
"fmt" | |
"io" | |
"log" | |
) | |
func gUnzipData(data []byte) (resData []byte, err error) { | |
b := bytes.NewBuffer(data) | |
var r io.Reader | |
r, err = gzip.NewReader(b) | |
if err != nil { | |
return | |
} | |
var resB bytes.Buffer | |
_, err = resB.ReadFrom(r) | |
if err != nil { | |
return | |
} | |
resData = resB.Bytes() | |
return | |
} | |
func gZipData(data []byte) (compressedData []byte, err error) { | |
var b bytes.Buffer | |
gz := gzip.NewWriter(&b) | |
_, err = gz.Write(data) | |
if err != nil { | |
return | |
} | |
if err = gz.Flush(); err != nil { | |
return | |
} | |
if err = gz.Close(); err != nil { | |
return | |
} | |
compressedData = b.Bytes() | |
return | |
} | |
func main() { | |
// define original data | |
data := []byte(`MyzYrIyMLyNqwDSTBqSwM2D6KD9sA8S/d3Vyy6ldE+oRVdWyqNQrjTxQ6uG3XBOS0P4GGaIMJEPQ/gYZogwkQ+A0/gSU03fRJvdhIGQ1AMARVdWyqNQrjRFV1bKo1CuNEVXVsqjUK40RVdWyqNQrjRFV1bKo1CuNPmQF870PPsnSNeKI1U/MrOA0/gSU03fRb2A3OsnORNIruhCUYTIrOMTNU7JuGb5RSYJxa6PiMHdiRmFtXLNoY+GVmTD7aOV/K1yo4y0dR7Q=`) | |
fmt.Println("original data:", data) | |
fmt.Println("original data len:", len(data)) | |
// compress data | |
compressedData, compressedDataErr := gZipData(data) | |
if compressedDataErr != nil { | |
log.Fatal(compressedDataErr) | |
} | |
fmt.Println("compressed data:", compressedData) | |
fmt.Println("compressed data len:", len(compressedData)) | |
// uncompress data | |
uncompressedData, uncompressedDataErr := gUnzipData(compressedData) | |
if uncompressedDataErr != nil { | |
log.Fatal(uncompressedDataErr) | |
} | |
fmt.Println("uncompressed data:", uncompressedData) | |
fmt.Println("uncompressed data len:", len(uncompressedData)) | |
} |
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