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package com.tightvnc.decoder;
import com.tightvnc.vncviewer.RfbInputStream;
import java.awt.Graphics;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Inflater;
//
// Class that used for decoding ZLib encoded data.
//
public class ZlibDecoder extends RawDecoder {
public ZlibDecoder(Graphics g, RfbInputStream is) {
super(g, is);
}
public ZlibDecoder(Graphics g, RfbInputStream is, int frameBufferW,
int frameBufferH) {
super(g, is, frameBufferW, frameBufferH);
}
//
// Override handleRect method to decode ZLib encoded data insted of
// raw pixel data.
//
public void handleRect(int x, int y, int w, int h) throws IOException {
int nBytes = rfbis.readU32();
if (zlibBuf == null || zlibBufLen < nBytes) {
zlibBufLen = nBytes * 2;
zlibBuf = new byte[zlibBufLen];
}
rfbis.readFully(zlibBuf, 0, nBytes);
//
// Save decoded data to RecordInterface
//
if (rec.canWrite() && rec.isRecordFromBeginning()) {
rec.writeIntBE(nBytes);
rec.write(zlibBuf, 0, nBytes);
}
if (zlibInflater == null) {
zlibInflater = new Inflater();
}
zlibInflater.setInput(zlibBuf, 0, nBytes);
try {
if (bytesPerPixel == 1) {
for (int dy = y; dy < y + h; dy++) {
zlibInflater.inflate(pixels8, dy * framebufferWidth + x, w);
//
// Save decoded data to RecordInterface
//
if (rec.canWrite() && !rec.isRecordFromBeginning())
rec.write(pixels8, dy * framebufferWidth + x, w);
}
} else {
byte[] buf = new byte[w * 4];
int i, offset;
for (int dy = y; dy < y + h; dy++) {
zlibInflater.inflate(buf);
offset = dy * framebufferWidth + x;
for (i = 0; i < w; i++) {
RawDecoder.pixels24[offset + i] =
(buf[i * 4 + 2] & 0xFF) << 16 |
(buf[i * 4 + 1] & 0xFF) << 8 |
(buf[i * 4] & 0xFF);
}
//
// Save decoded data to RecordInterface
//
if (rec.canWrite() && !rec.isRecordFromBeginning())
rec.write(buf);
}
}
} catch (DataFormatException ex) {
ex.printStackTrace();
}
handleUpdatedPixels(x, y, w, h);
}
//
// Zlib encoder's data.
//
protected byte[] zlibBuf;
protected int zlibBufLen = 0;
protected Inflater zlibInflater;
}
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