141 lines
4.7 KiB
Java
141 lines
4.7 KiB
Java
/* Taken from the javaxdelta project.
|
|
|
|
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/javaxdelta/javaxdelta/com/nothome/delta/GDiffWriter.java?rev=1.1.1.1&content-type=text/vnd.viewcvs-markup */
|
|
|
|
/*
|
|
*
|
|
* Copyright (c) 2001 Torgeir Veimo
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
* IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
package org.thdl.util.javaxdelta;
|
|
|
|
|
|
/**
|
|
* The output follows the GDIFF file specification available at
|
|
* http://www.w3.org/TR/NOTE-gdiff-19970901.html.
|
|
*/
|
|
|
|
import java.util.*;
|
|
import java.io.*;
|
|
|
|
public class GDiffWriter implements DiffWriter {
|
|
|
|
byte buf[] = new byte[256]; int buflen = 0;
|
|
|
|
protected boolean debug = false;
|
|
|
|
//Vector writeQueue = new Vector();
|
|
DataOutputStream output = null;
|
|
|
|
public GDiffWriter(DataOutputStream os) throws IOException {
|
|
this.output = os;
|
|
// write magic string "d1 ff d1 ff 04"
|
|
output.writeByte(0xd1);
|
|
output.writeByte(0xff);
|
|
output.writeByte(0xd1);
|
|
output.writeByte(0xff);
|
|
output.writeByte(0x04);
|
|
}
|
|
|
|
public void setDebug(boolean flag) { debug = flag; }
|
|
|
|
public void addCopy(int offset, int length) throws IOException {
|
|
if (buflen > 0)
|
|
writeBuf();
|
|
|
|
//output debug data
|
|
if (debug)
|
|
System.err.println("COPY off: " + offset + ", len: " + length);
|
|
|
|
// output real data
|
|
byte command;
|
|
if (offset > Integer.MAX_VALUE) {
|
|
// use long, int format
|
|
output.writeByte(255);
|
|
// Actually, we don't support longer files than int.MAX_VALUE at the moment..
|
|
} else if (offset < 65536) {
|
|
if (length < 256) {
|
|
// use ushort, ubyte
|
|
output.writeByte(249);
|
|
output.writeShort(offset);
|
|
output.writeByte(length);
|
|
} else if (length > 65535) {
|
|
// use ushort, int
|
|
output.writeByte(251);
|
|
output.writeShort(offset);
|
|
output.writeInt(length);
|
|
} else {
|
|
// use ushort, ushort
|
|
output.writeByte(250);
|
|
output.writeShort(offset);
|
|
output.writeShort(length);
|
|
}
|
|
} else {
|
|
if (length < 256) {
|
|
// use int, ubyte
|
|
output.writeByte(252);
|
|
output.writeInt(offset);
|
|
output.writeByte(length);
|
|
} else if (length > 65535) {
|
|
// use int, int
|
|
output.writeByte(254);
|
|
output.writeInt(offset);
|
|
output.writeInt(length);
|
|
} else {
|
|
// use int, ushort
|
|
output.writeByte(253);
|
|
output.writeInt(offset);
|
|
output.writeShort(length);
|
|
}
|
|
}
|
|
}
|
|
|
|
public void addData(byte b) throws IOException {
|
|
if (buflen >= 246)
|
|
writeBuf();
|
|
buf[buflen] = b; buflen++;
|
|
}
|
|
|
|
private void writeBuf() throws IOException {
|
|
// output debug data
|
|
if (debug) {
|
|
System.err.print("DATA:");
|
|
for (int ix = 0; ix < buflen; ix++) {
|
|
if (buf[ix] == '\n')
|
|
System.err.print("\\n");
|
|
else
|
|
System.err.print(String.valueOf((char)((char) buf[ix])));
|
|
}
|
|
System.err.println("");
|
|
}
|
|
|
|
if (buflen > 0) {
|
|
// output real data
|
|
output.writeByte(buflen);
|
|
output.write(buf, 0, buflen);
|
|
}
|
|
buflen = 0;
|
|
}
|
|
|
|
public void flush() throws IOException { if (buflen > 0) writeBuf(); output.flush(); }
|
|
public void close() throws IOException { this.flush(); }
|
|
}
|