mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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97 lines
2.8 KiB
Go
97 lines
2.8 KiB
Go
//go:build cgo
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// +build cgo
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package zstd
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import (
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"math/rand"
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"testing"
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pure "github.com/klauspost/compress/zstd"
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cgo "github.com/valyala/gozstd"
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)
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func TestCompressDecompress(t *testing.T) {
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testCrossCompressDecompress(t, []byte("a"))
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testCrossCompressDecompress(t, []byte("foobarbaz"))
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var b []byte
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for i := 0; i < 64*1024; i++ {
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b = append(b, byte(rand.Int31n(256)))
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}
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testCrossCompressDecompress(t, b)
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}
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func testCrossCompressDecompress(t *testing.T, b []byte) {
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testCompressDecompress(t, pureCompress, pureDecompress, b)
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testCompressDecompress(t, cgoCompress, cgoDecompress, b)
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testCompressDecompress(t, pureCompress, cgoDecompress, b)
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testCompressDecompress(t, cgoCompress, pureDecompress, b)
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}
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func testCompressDecompress(t *testing.T, compress compressFn, decompress decompressFn, b []byte) {
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bc, err := compress(nil, b, 5)
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if err != nil {
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t.Fatalf("unexpected error when compressing b=%x: %s", b, err)
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}
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bNew, err := decompress(nil, bc)
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if err != nil {
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t.Fatalf("unexpected error when decompressing b=%x from bc=%x: %s", b, bc, err)
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}
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if string(bNew) != string(b) {
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t.Fatalf("invalid bNew; got\n%x; expecting\n%x", bNew, b)
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}
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prefix := []byte{1, 2, 33}
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bcNew, err := compress(prefix, b, 5)
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if err != nil {
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t.Fatalf("unexpected error when compressing b=%x: %s", bcNew, err)
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}
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if string(bcNew[:len(prefix)]) != string(prefix) {
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t.Fatalf("invalid prefix for b=%x; got\n%x; expecting\n%x", b, bcNew[:len(prefix)], prefix)
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}
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if string(bcNew[len(prefix):]) != string(bc) {
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t.Fatalf("invalid prefixed bcNew for b=%x; got\n%x; expecting\n%x", b, bcNew[len(prefix):], bc)
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}
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bNew, err = decompress(prefix, bc)
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if err != nil {
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t.Fatalf("unexpected error when decompressing b=%x from bc=%x with prefix: %s", b, bc, err)
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}
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if string(bNew[:len(prefix)]) != string(prefix) {
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t.Fatalf("invalid bNew prefix when decompressing bc=%x; got\n%x; expecting\n%x", bc, bNew[:len(prefix)], prefix)
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}
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if string(bNew[len(prefix):]) != string(b) {
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t.Fatalf("invalid prefixed bNew; got\n%x; expecting\n%x", bNew[len(prefix):], b)
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}
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}
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type compressFn func(dst, src []byte, compressionLevel int) ([]byte, error)
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func pureCompress(dst, src []byte, _ int) ([]byte, error) {
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w, err := pure.NewWriter(nil,
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pure.WithEncoderCRC(false), // Disable CRC for performance reasons.
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pure.WithEncoderLevel(pure.SpeedBestCompression))
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if err != nil {
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return nil, err
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}
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return w.EncodeAll(src, dst), nil
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}
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func cgoCompress(dst, src []byte, compressionLevel int) ([]byte, error) {
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return cgo.CompressLevel(dst, src, compressionLevel), nil
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}
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type decompressFn func(dst, src []byte) ([]byte, error)
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func pureDecompress(dst, src []byte) ([]byte, error) {
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decoder, err := pure.NewReader(nil)
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if err != nil {
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return nil, err
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}
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return decoder.DecodeAll(src, dst)
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}
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func cgoDecompress(dst, src []byte) ([]byte, error) {
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return cgo.Decompress(dst, src)
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}
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