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add zstandard encoder/decoder pipeline modifier and simplify setPipeline
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package bstates | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "github.com/klauspost/compress/zstd" | ||
| "io" | ||
|
|
||
| "github.com/nayarsystems/buffer/buffer" | ||
| ) | ||
|
|
||
| func ZstdEnc(b *buffer.Buffer) (*buffer.Buffer, error) { | ||
| buf := new(bytes.Buffer) | ||
| wr, err := zstd.NewWriter(buf, zstd.WithEncoderConcurrency(1)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| _, err = wr.Write(b.GetRawBuffer()[:b.GetByteSize()]) | ||
| wr.Close() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var out []byte | ||
| out, err = io.ReadAll(buf) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| outb := &buffer.Buffer{} | ||
| outb.InitFromRawBuffer(out) | ||
| return outb, nil | ||
| } | ||
|
|
||
| func ZstdDec(b *buffer.Buffer) (*buffer.Buffer, error) { | ||
| r := bytes.NewReader(b.GetRawBuffer()[:b.GetByteSize()]) | ||
| var gzr *zstd.Decoder | ||
| gzr, err := zstd.NewReader(r, zstd.WithDecoderConcurrency(1)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| var out []byte | ||
| out, err = io.ReadAll(gzr) | ||
| gzr.Close() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| outb := &buffer.Buffer{} | ||
| outb.InitFromRawBuffer(out) | ||
| return outb, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| package bstates | ||
|
|
||
| import ( | ||
| "testing" | ||
|
|
||
| "github.com/nayarsystems/buffer/buffer" | ||
| "github.com/nayarsystems/buffer/shuffling" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
|
|
||
| func Test_ZstdBufferTransposeCompression(t *testing.T) { | ||
| b := &buffer.Buffer{} | ||
| b.InitFromRawBuffer(make([]byte, 10000)) | ||
|
|
||
| for i := 0; i < b.GetByteSize(); i++ { | ||
| b.GetRawBuffer()[i] = uint8(i) | ||
| } | ||
|
|
||
| bt, err := shuffling.TransposeBits(b, 8) | ||
| require.Nil(t, err) | ||
| require.Equal(t, b.GetByteSize(), bt.GetByteSize()) | ||
|
|
||
| eb, err := ZstdEnc(b) | ||
| require.Nil(t, err) | ||
| db, err := ZstdDec(eb) | ||
| require.Nil(t, err) | ||
| require.Equal(t, b, db) | ||
|
|
||
| ebt, err := ZstdEnc(bt) | ||
| require.Nil(t, err) | ||
| dbt, err := ZstdDec(ebt) | ||
| require.Nil(t, err) | ||
| require.Equal(t, bt, dbt) | ||
|
|
||
| require.Less(t, ebt.GetByteSize(), eb.GetByteSize()) | ||
| } |