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/*
* Copyright (c) 2005, Joe Desbonnet, (jdesbonnet@gmail.com)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY <copyright holder> ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package ie.wombat.jbdiff;
import com.intellij.updater.Utils;
import java.io.*;
import java.util.zip.GZIPInputStream;
/**
* Java Binary patcher (based on bspatch by Colin Percival)
*
* @author Joe Desbonnet, jdesbonnet@gmail.com
*/
public class JBPatch {
public static void bspatch(InputStream oldFileIn, OutputStream newFileOut, InputStream diffFileIn)
throws IOException {
int oldpos, newpos;
byte[] diffData = Utils.readBytes(diffFileIn);
DataInputStream diffIn = new DataInputStream(new ByteArrayInputStream(diffData));
// headerMagic at header offset 0 (length 8 bytes)
long headerMagic = diffIn.readLong();
// ctrlBlockLen after gzip compression at heater offset 8 (length 8 bytes)
long ctrlBlockLen = diffIn.readLong();
// diffBlockLen after gzip compression at header offset 16 (length 8 bytes)
long diffBlockLen = diffIn.readLong();
// size of new file at header offset 24 (length 8 bytes)
int newsize = (int)diffIn.readLong();
/*
System.err.println ("newsize=" + newsize);
System.err.println ("ctrlBlockLen=" + ctrlBlockLen);
System.err.println ("diffBlockLen=" + diffBlockLen);
System.err.println ("newsize=" + newsize);
*/
InputStream in;
in = new ByteArrayInputStream(diffData);
in.skip(ctrlBlockLen + 32);
GZIPInputStream diffBlockIn = new GZIPInputStream(in);
in = new ByteArrayInputStream(diffData);
in.skip(diffBlockLen + ctrlBlockLen + 32);
GZIPInputStream extraBlockIn = new GZIPInputStream(in);
/*
* Read in old file (file to be patched) to oldBuf
*/
ByteArrayOutputStream oldFileByteOut = new ByteArrayOutputStream();
try {
Utils.copyStream(oldFileIn, oldFileByteOut);
}
finally {
oldFileByteOut.close();
}
byte[] oldBuf = oldFileByteOut.toByteArray();
int oldsize = oldBuf.length;
byte[] newBuf = new byte[newsize + 1];
oldpos = 0;
newpos = 0;
int[] ctrl = new int[3];
int nbytes;
while (newpos < newsize) {
for (int i = 0; i <= 2; i++) {
ctrl[i] = diffIn.readInt();
//System.err.println (" ctrl[" + i + "]=" + ctrl[i]);
}
if (newpos + ctrl[0] > newsize) {
System.err.println("Corrupt patch\n");
return;
}
/*
* Read ctrl[0] bytes from diffBlock stream
*/
if (!Util.readFromStream(diffBlockIn, newBuf, newpos, ctrl[0])) {
System.err.println("error reading from extraIn");
return;
}
for (int i = 0; i < ctrl[0]; i++) {
if ((oldpos + i >= 0) && (oldpos + i < oldsize)) {
newBuf[newpos + i] += oldBuf[oldpos + i];
}
}
newpos += ctrl[0];
oldpos += ctrl[0];
if (newpos + ctrl[1] > newsize) {
System.err.println("Corrupt patch");
return;
}
if (!Util.readFromStream(extraBlockIn, newBuf, newpos, ctrl[1])) {
System.err.println("error reading from extraIn");
return;
}
newpos += ctrl[1];
oldpos += ctrl[2];
}
// TODO: Check if at end of ctrlIn
// TODO: Check if at the end of diffIn
// TODO: Check if at the end of extraIn
diffBlockIn.close();
extraBlockIn.close();
diffIn.close();
newFileOut.write(newBuf, 0, newBuf.length - 1);
}
}
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