67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
package compression
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/rand"
|
|
"io/ioutil"
|
|
"testing"
|
|
)
|
|
|
|
// generateData generates data that composed of 2 random parts
|
|
// and single zero-filled part within them.
|
|
// Typically, the compression ratio would be about 67%.
|
|
func generateData(t *testing.T, size int) []byte {
|
|
part0 := size / 3 // random
|
|
part2 := size / 3 // random
|
|
part1 := size - part0 - part2 // zero-filled
|
|
part0Data := make([]byte, part0)
|
|
if _, err := rand.Read(part0Data); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
part1Data := make([]byte, part1)
|
|
part2Data := make([]byte, part2)
|
|
if _, err := rand.Read(part2Data); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
return append(part0Data, append(part1Data, part2Data...)...)
|
|
}
|
|
|
|
func testCompressDecompress(t *testing.T, size int, compression Compression) {
|
|
orig := generateData(t, size)
|
|
var b bytes.Buffer
|
|
compressor, err := CompressStream(&b, compression)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if n, err := compressor.Write(orig); err != nil || n != size {
|
|
t.Fatal(err)
|
|
}
|
|
compressor.Close()
|
|
compressed := b.Bytes()
|
|
t.Logf("compressed %d bytes to %d bytes (%.2f%%)",
|
|
len(orig), len(compressed), 100.0*float32(len(compressed))/float32(len(orig)))
|
|
if compared := bytes.Compare(orig, compressed); (compression == Uncompressed && compared != 0) ||
|
|
(compression != Uncompressed && compared == 0) {
|
|
t.Fatal("strange compressed data")
|
|
}
|
|
|
|
decompressor, err := DecompressStream(bytes.NewReader(compressed))
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
decompressed, err := ioutil.ReadAll(decompressor)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
if !bytes.Equal(orig, decompressed) {
|
|
t.Fatal("strange decompressed data")
|
|
}
|
|
}
|
|
|
|
func TestCompressDecompressGzip(t *testing.T) {
|
|
testCompressDecompress(t, 1024*1024, Gzip)
|
|
}
|
|
|
|
func TestCompressDecompressUncompressed(t *testing.T) {
|
|
testCompressDecompress(t, 1024*1024, Uncompressed)
|
|
}
|