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xerial_test.go
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package snappy
import (
"bytes"
"crypto/rand"
"io"
"testing"
goxerialsnappy "github.com/eapache/go-xerial-snappy"
"github.com/golang/snappy"
)
// Wrap an io.Reader or io.Writer to disable all copy optimizations like
// io.WriterTo or io.ReaderFrom.
// We use this to ensure writes are chunked by io.Copy's internal buffer
// in the tests.
type simpleReader struct{ io.Reader }
type simpleWriter struct{ io.Writer }
func TestXerialReaderSnappy(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
compressedRawData := bytes.NewReader(snappy.Encode(nil, rawData.Bytes()))
decompressedData := new(bytes.Buffer)
io.Copy(decompressedData,
&xerialReader{reader: compressedRawData, decode: snappy.Decode})
b0 := rawData.Bytes()
b1 := decompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialReaderWriter(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedData := new(bytes.Buffer)
framedData.Grow(rawData.Len() + 1024)
w := simpleWriter{&xerialWriter{writer: framedData}}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Writer.(*xerialWriter).Flush()
unframedData := new(bytes.Buffer)
unframedData.Grow(rawData.Len())
io.Copy(unframedData, &xerialReader{reader: framedData})
b0 := rawData.Bytes()
b1 := unframedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialFramedCompression(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedAndCompressedData := new(bytes.Buffer)
framedAndCompressedData.Grow(rawData.Len())
w := simpleWriter{&xerialWriter{writer: framedAndCompressedData, framed: true, encode: snappy.Encode}}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Writer.(*xerialWriter).Flush()
unframedAndDecompressedData := new(bytes.Buffer)
unframedAndDecompressedData.Grow(rawData.Len())
io.Copy(unframedAndDecompressedData,
simpleReader{&xerialReader{reader: framedAndCompressedData, decode: snappy.Decode}})
b0 := rawData.Bytes()
b1 := unframedAndDecompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialFramedCompressionOptimized(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedAndCompressedData := new(bytes.Buffer)
framedAndCompressedData.Grow(rawData.Len())
w := &xerialWriter{writer: framedAndCompressedData, framed: true, encode: snappy.Encode}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Flush()
unframedAndDecompressedData := new(bytes.Buffer)
unframedAndDecompressedData.Grow(rawData.Len())
io.Copy(unframedAndDecompressedData,
&xerialReader{reader: framedAndCompressedData, decode: snappy.Decode})
b0 := rawData.Bytes()
b1 := unframedAndDecompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialReaderAgainstGoXerialSnappy(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
rawBytes := rawData.Bytes()
framedAndCompressedData := []byte{}
const chunkSize = 999
for i := 0; i < len(rawBytes); i += chunkSize {
j := i + chunkSize
if j > len(rawBytes) {
j = len(rawBytes)
}
framedAndCompressedData = goxerialsnappy.EncodeStream(framedAndCompressedData, rawBytes[i:j])
}
unframedAndDecompressedData := new(bytes.Buffer)
unframedAndDecompressedData.Grow(rawData.Len())
io.Copy(unframedAndDecompressedData,
&xerialReader{reader: bytes.NewReader(framedAndCompressedData), decode: snappy.Decode})
b0 := rawBytes
b1 := unframedAndDecompressedData.Bytes()
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}
func TestXerialWriterAgainstGoXerialSnappy(t *testing.T) {
rawData := new(bytes.Buffer)
rawData.Grow(1024 * 1024)
io.CopyN(rawData, rand.Reader, 1024*1024)
framedAndCompressedData := new(bytes.Buffer)
framedAndCompressedData.Grow(rawData.Len())
w := &xerialWriter{writer: framedAndCompressedData, framed: true, encode: snappy.Encode}
r := simpleReader{bytes.NewReader(rawData.Bytes())}
io.Copy(w, r)
w.Flush()
unframedAndDecompressedData, err := goxerialsnappy.Decode(framedAndCompressedData.Bytes())
if err != nil {
t.Error(err)
}
b0 := rawData.Bytes()
b1 := unframedAndDecompressedData
if !bytes.Equal(b0, b1) {
t.Error("data mismatch")
}
}