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encoding_zlib.go
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encoding_zlib.go
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package vnc2video
import (
"bytes"
"compress/zlib"
"image/draw"
"io"
)
type ZLibEncoding struct {
Image draw.Image
unzipper io.Reader
zippedBuff *bytes.Buffer
}
func (*ZLibEncoding) Type() EncodingType {
return EncZlib
}
func (enc *ZLibEncoding) WriteTo(w io.Writer) (n int, err error) {
return 0, nil
}
func (enc *ZLibEncoding) Write(c Conn, rect *Rectangle) error {
return nil
}
func (enc *ZLibEncoding) SetTargetImage(img draw.Image) {
enc.Image = img
}
func (*ZLibEncoding) Supported(Conn) bool {
return true
}
func (enc *ZLibEncoding) Reset() error {
enc.unzipper = nil
return nil
}
func (enc *ZLibEncoding) Read(r Conn, rect *Rectangle) error {
//func (z *ZLibEncoding) Read(pixelFmt *PixelFormat, rect *Rectangle, r io.Reader) (Encoding, error) {
//conn := RfbReadHelper{Reader:r}
//conn := &DataSource{conn: conn.c, PixelFormat: conn.PixelFormat}
pf := r.PixelFormat()
//bytesPerPixel := r.PixelFormat().BPP / 8
//bytesBuff := &bytes.Buffer{}
zippedLen, err := ReadUint32(r)
if err != nil {
return err
}
b, err := ReadBytes(int(zippedLen), r)
if err != nil {
return err
}
bytesBuff := bytes.NewBuffer(b)
if enc.unzipper == nil {
enc.unzipper, err = zlib.NewReader(bytesBuff)
enc.zippedBuff = bytesBuff
if err != nil {
return err
}
} else {
enc.zippedBuff.Write(b)
}
DecodeRaw(enc.unzipper, &pf, rect, enc.Image)
return nil
}