/
flate.go
52 lines (41 loc) · 904 Bytes
/
flate.go
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package compress
import (
"os"
"github.com/xiaonanln/goworld/engine/gwioutil"
"bytes"
"compress/flate"
"io"
"io/ioutil"
)
func NewFlateCompressor() Compressor {
fc := &flateCompressor{
reader: flate.NewReader(os.Stdin),
}
var err error
fc.writer, err = flate.NewWriter(ioutil.Discard, flate.BestSpeed)
if err != nil {
panic(err)
}
return fc
}
type flateCompressor struct {
writer *flate.Writer
reader io.ReadCloser
}
func (fc *flateCompressor) Compress(b []byte, c []byte) ([]byte, error) {
wb := bytes.NewBuffer(c)
fc.writer.Reset(wb)
n, err := fc.writer.Write(b)
if err != nil {
return nil, err
}
if n != len(b) {
return nil, errNotFullyCompressed
}
fc.writer.Flush()
return wb.Bytes(), nil
}
func (fc *flateCompressor) Decompress(c []byte, b []byte) error {
fc.reader.(flate.Resetter).Reset(bytes.NewReader(c), nil)
return gwioutil.ReadAll(fc.reader, b)
}