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package compress
import (
"os"
"bytes"
"github.com/golang/snappy"
"github.com/xiaonanln/goworld/engine/gwioutil"
)
func NewSnappyCompressor() Compressor {
return &snappyCompressor{
writer: snappy.NewWriter(os.Stdout),
reader: snappy.NewReader(os.Stdin),
}
}
type snappyCompressor struct {
writer *snappy.Writer
reader *snappy.Reader
}
func (sc *snappyCompressor) Compress(b []byte, c []byte) ([]byte, error) {
wb := bytes.NewBuffer(c)
sc.writer.Reset(wb)
n, err := sc.writer.Write(b)
if err != nil {
return nil, err
}
if n != len(b) {
return nil, errNotFullyCompressed
}
sc.writer.Flush()
return wb.Bytes(), nil
}
func (sc *snappyCompressor) Decompress(c []byte, b []byte) error {
sc.reader.Reset(bytes.NewReader(c))
return gwioutil.ReadAll(sc.reader, b)
}
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