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//
// Copyright (C) 2002 Constantin Kaplinsky. All Rights Reserved.
//
// This is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this software; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
//
//
// SessionRecorder is a class to write FBS (FrameBuffer Stream) files.
// FBS files are used to save RFB sessions for later playback.
//
package tightvncviewer;
import java.io.*;
class SessionRecorder {
protected FileOutputStream f;
protected DataOutputStream df;
protected long startTime, lastTimeOffset;
protected byte[] buffer;
protected int bufferSize;
protected int bufferBytes;
public SessionRecorder(String name, int bufsize) throws IOException {
f = new FileOutputStream(name);
df = new DataOutputStream(f);
startTime = System.currentTimeMillis();
lastTimeOffset = 0;
bufferSize = bufsize;
bufferBytes = 0;
buffer = new byte[bufferSize];
}
public SessionRecorder(String name) throws IOException {
this(name, 65536);
}
//
// Close the file, free resources.
//
public void close() throws IOException {
try {
flush();
} catch (IOException e) {
}
df = null;
f.close();
f = null;
buffer = null;
}
//
// Write the FBS file header as defined in the rfbproxy utility.
//
public void writeHeader() throws IOException {
df.write("FBS 001.000\n".getBytes());
}
//
// Write one byte.
//
public void writeByte(int b) throws IOException {
prepareWriting();
buffer[bufferBytes++] = (byte)b;
}
//
// Write 16-bit value, big-endian.
//
public void writeShortBE(int v) throws IOException {
prepareWriting();
buffer[bufferBytes++] = (byte)(v >> 8);
buffer[bufferBytes++] = (byte)v;
}
//
// Write 32-bit value, big-endian.
//
public void writeIntBE(int v) throws IOException {
prepareWriting();
buffer[bufferBytes] = (byte)(v >> 24);
buffer[bufferBytes + 1] = (byte)(v >> 16);
buffer[bufferBytes + 2] = (byte)(v >> 8);
buffer[bufferBytes + 3] = (byte)v;
bufferBytes += 4;
}
//
// Write 16-bit value, little-endian.
//
public void writeShortLE(int v) throws IOException {
prepareWriting();
buffer[bufferBytes++] = (byte)v;
buffer[bufferBytes++] = (byte)(v >> 8);
}
//
// Write 32-bit value, little-endian.
//
public void writeIntLE(int v) throws IOException {
prepareWriting();
buffer[bufferBytes] = (byte)v;
buffer[bufferBytes + 1] = (byte)(v >> 8);
buffer[bufferBytes + 2] = (byte)(v >> 16);
buffer[bufferBytes + 3] = (byte)(v >> 24);
bufferBytes += 4;
}
//
// Write byte arrays.
//
public void write(byte b[], int off, int len) throws IOException {
prepareWriting();
while (len > 0) {
if (bufferBytes > bufferSize - 4)
flush(false);
int partLen;
if (bufferBytes + len > bufferSize) {
partLen = bufferSize - bufferBytes;
} else {
partLen = len;
}
System.arraycopy(b, off, buffer, bufferBytes, partLen);
bufferBytes += partLen;
off += partLen;
len -= partLen;
}
}
public void write(byte b[]) throws IOException {
write(b, 0, b.length);
}
//
// Flush the output. This method saves buffered data in the
// underlying file object adding data sizes and timestamps. If the
// updateTimeOffset is set to false, then the current time offset
// will not be changed for next write operation.
//
public void flush(boolean updateTimeOffset) throws IOException {
if (bufferBytes > 0) {
df.writeInt(bufferBytes);
df.write(buffer, 0, (bufferBytes + 3) & 0x7FFFFFFC);
df.writeInt((int)lastTimeOffset);
bufferBytes = 0;
if (updateTimeOffset)
lastTimeOffset = -1;
}
}
public void flush() throws IOException {
flush(true);
}
//
// Before writing any data, remember time offset and flush the
// buffer before it becomes full.
//
protected void prepareWriting() throws IOException {
if (lastTimeOffset == -1)
lastTimeOffset = System.currentTimeMillis() - startTime;
if (bufferBytes > bufferSize - 4)
flush(false);
}
}
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