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javaxdelta - Patch generator and patch tool using the GDIFF algorithm
/*
* Copyright (c) 2003, 2007 s IT Solutions AT Spardat GmbH.
*
* 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 at.spardat.xma.xdelta;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.zip.ZipException;
import org.apache.commons.compress.archivers.zip.ExtraFieldUtils;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.commons.compress.archivers.zip.ZipFile;
import com.nothome.delta.GDiffPatcher;
import com.nothome.delta.PatchException;
/**
* This class applys a zip file containing deltas created with {@link JarDelta} using
* {@link com.nothome.delta.GDiffPatcher} on the files contained in the jar file.
* The result of this operation is not binary equal to the original target zip file.
* Timestamps of files and directories are not reconstructed. But the contents of all
* files in the reconstructed target zip file are complely equal to their originals.
*
* @author s2877
*/
public class JarPatcher {
/** The patch name. */
private final String patchName;
/** The source name. */
private final String sourceName;
/** The buffer. */
private final byte[] buffer = new byte[8 * 1024];
/** The next. */
private String next = null;
/**
* Applies the differences in patch to source to create the target file. All binary difference files
* are applied to their corresponding file in source using {@link com.nothome.delta.GDiffPatcher}.
* All other files listed in META-INF/file.list are copied from patch to output.
*
* @param patch a zip file created by {@link JarDelta#computeDelta(String, String, ZipFile, ZipFile, ZipArchiveOutputStream)}
* containing the patches to apply
* @param source the original zip file, where the patches have to be applied
* @param output the patched zip file to create
* @param list the list
* @throws IOException if an error occures reading or writing any entry in a zip file
*/
public void applyDelta(ZipFile patch, ZipFile source, ZipArchiveOutputStream output, BufferedReader list) throws IOException {
applyDelta(patch, source, output, list, "");
patch.close();
}
/**
* Apply delta.
*
* @param patch the patch
* @param source the source
* @param output the output
* @param list the list
* @param prefix the prefix
* @throws IOException Signals that an I/O exception has occurred.
*/
public void applyDelta(ZipFile patch, ZipFile source, ZipArchiveOutputStream output, BufferedReader list, String prefix) throws IOException {
String fileName = null;
try {
for (fileName = (next == null ? list.readLine() : next); fileName != null; fileName = (next == null ? list.readLine() : next)) {
if (next != null)
next = null;
if (!fileName.startsWith(prefix)) {
next = fileName;
return;
}
int crcDelim = fileName.lastIndexOf(':');
int crcStart = fileName.lastIndexOf('|');
long crc = Long.valueOf(fileName.substring(crcStart + 1, crcDelim), 16);
long crcSrc = Long.valueOf(fileName.substring(crcDelim + 1), 16);
fileName = fileName.substring(prefix.length(), crcStart);
if ("META-INF/file.list".equalsIgnoreCase(fileName))
continue;
if (fileName.contains("!")) {
String[] embeds = fileName.split("\\!");
ZipArchiveEntry original = getEntry(source, embeds[0], crcSrc);
File originalFile = File.createTempFile("jardelta-tmp-origin-", ".zip");
File outputFile = File.createTempFile("jardelta-tmp-output-", ".zip");
Exception thrown = null;
try (FileOutputStream out = new FileOutputStream(originalFile); InputStream in = source.getInputStream(original)) {
int read = 0;
while (-1 < (read = in.read(buffer))) {
out.write(buffer, 0, read);
}
out.flush();
applyDelta(patch, new ZipFile(originalFile), new ZipArchiveOutputStream(outputFile), list, prefix + embeds[0] + "!");
} catch (Exception e) {
thrown = e;
throw e;
} finally {
originalFile.delete();
try (FileInputStream in = new FileInputStream(outputFile)) {
if (thrown == null) {
ZipArchiveEntry outEntry = copyEntry(original);
output.putArchiveEntry(outEntry);
int read = 0;
while (-1 < (read = in.read(buffer))) {
output.write(buffer, 0, read);
}
output.flush();
output.closeArchiveEntry();
}
} finally {
outputFile.delete();
}
}
} else {
try {
ZipArchiveEntry patchEntry = getEntry(patch, prefix + fileName, crc);
if (patchEntry != null) { // new Entry
ZipArchiveEntry outputEntry = JarDelta.entryToNewName(patchEntry, fileName);
output.putArchiveEntry(outputEntry);
if (!patchEntry.isDirectory()) {
try (InputStream in = patch.getInputStream(patchEntry)) {
int read = 0;
while (-1 < (read = in.read(buffer))) {
output.write(buffer, 0, read);
}
}
}
closeEntry(output, outputEntry, crc);
} else {
ZipArchiveEntry sourceEntry = getEntry(source, fileName, crcSrc);
if (sourceEntry == null) {
throw new FileNotFoundException(fileName + " not found in " + sourceName + " or " + patchName);
}
if (sourceEntry.isDirectory()) {
ZipArchiveEntry outputEntry = new ZipArchiveEntry(sourceEntry);
output.putArchiveEntry(outputEntry);
closeEntry(output, outputEntry, crc);
continue;
}
patchEntry = getPatchEntry(patch, prefix + fileName + ".gdiff", crc);
if (patchEntry != null) { // changed Entry
ZipArchiveEntry outputEntry = new ZipArchiveEntry(sourceEntry);
outputEntry.setTime(patchEntry.getTime());
output.putArchiveEntry(outputEntry);
byte[] sourceBytes = new byte[(int) sourceEntry.getSize()];
try (InputStream sourceStream = source.getInputStream(sourceEntry)) {
for (int erg = sourceStream.read(sourceBytes); erg < sourceBytes.length; erg += sourceStream.read(sourceBytes, erg, sourceBytes.length - erg));
}
InputStream patchStream = patch.getInputStream(patchEntry);
GDiffPatcher diffPatcher = new GDiffPatcher();
diffPatcher.patch(sourceBytes, patchStream, output);
patchStream.close();
outputEntry.setCrc(crc);
closeEntry(output, outputEntry, crc);
} else { // unchanged Entry
ZipArchiveEntry outputEntry = new ZipArchiveEntry(sourceEntry);
output.putArchiveEntry(outputEntry);
try (InputStream in = source.getInputStream(sourceEntry)) {
int read = 0;
while (-1 < (read = in.read(buffer))) {
output.write(buffer, 0, read);
}
}
output.flush();
closeEntry(output, outputEntry, crc);
}
}
} catch (PatchException pe) {
IOException ioe = new IOException();
ioe.initCause(pe);
throw ioe;
}
}
}
} catch (Exception e) {
System.err.println(prefix + fileName);
throw e;
} finally {
source.close();
output.close();
}
}
/**
* Gets the entry.
*
* @param source the source
* @param name the name
* @param crc the crc
* @return the entry
*/
private ZipArchiveEntry getEntry(ZipFile source, String name, long crc) {
for (ZipArchiveEntry next : source.getEntries(name)) {
if (next.getCrc() == crc)
return next;
}
if (!JarDelta.zipFilesPattern.matcher(name).matches()) {
return null;
} else {
return source.getEntry(name);
}
}
/**
* Gets the patch entry.
*
* @param source the source
* @param name the name
* @param crc the crc
* @return the patch entry
*/
private ZipArchiveEntry getPatchEntry(ZipFile source, String name, long crc) {
for (ZipArchiveEntry next : source.getEntries(name)) {
long nextCrc = Long.parseLong(next.getComment());
if (nextCrc == crc)
return next;
}
return null;
}
/**
* Close entry.
*
* @param output the output
* @param outEntry the out entry
* @param crc the crc
* @throws IOException Signals that an I/O exception has occurred.
*/
private void closeEntry(ZipArchiveOutputStream output, ZipArchiveEntry outEntry, long crc) throws IOException {
output.flush();
output.closeArchiveEntry();
if (outEntry.getCrc() != crc)
throw new IOException("CRC mismatch for " + outEntry.getName());
}
/**
* Instantiates a new jar patcher.
*
* @param patchName the patch name
* @param sourceName the source name
*/
public JarPatcher(String patchName, String sourceName) {
this.patchName = patchName;
this.sourceName = sourceName;
}
/**
* Main method to make {@link #applyDelta(ZipFile, ZipFile, ZipArchiveOutputStream, BufferedReader)} available at
* the command line.
* usage JarPatcher source patch output
*
* @param args the arguments
* @throws IOException Signals that an I/O exception has occurred.
*/
public static void main(String[] args) throws IOException {
String patchName = null;
String outputName = null;
String sourceName = null;
if (args.length == 0) {
System.err.println("usage JarPatcher patch [output [source]]");
System.exit(1);
} else {
patchName = args[0];
if (args.length > 1) {
outputName = args[1];
if (args.length > 2) {
sourceName = args[2];
}
}
}
ZipFile patch = new ZipFile(patchName);
ZipArchiveEntry listEntry = patch.getEntry("META-INF/file.list");
if (listEntry == null) {
System.err.println("Invalid patch - list entry 'META-INF/file.list' not found");
System.exit(2);
}
BufferedReader list = new BufferedReader(new InputStreamReader(patch.getInputStream(listEntry)));
String next = list.readLine();
if (sourceName == null) {
sourceName = next;
}
next = list.readLine();
if (outputName == null) {
outputName = next;
}
int ignoreSourcePaths = Integer.parseInt(System.getProperty("patcher.ignoreSourcePathElements", "0"));
int ignoreOutputPaths = Integer.parseInt(System.getProperty("patcher.ignoreOutputPathElements", "0"));
Path sourcePath = Paths.get(sourceName);
Path outputPath = Paths.get(outputName);
if (ignoreOutputPaths >= outputPath.getNameCount()) {
patch.close();
StringBuilder b = new StringBuilder().append("Not enough path elements to ignore in output (").append(ignoreOutputPaths).append(" in ").append(outputName).append(")");
throw new IOException(b.toString());
}
if (ignoreSourcePaths >= sourcePath.getNameCount()) {
patch.close();
StringBuilder b = new StringBuilder().append("Not enough path elements to ignore in source (").append(sourcePath).append(" in ").append(sourceName).append(")");
throw new IOException(b.toString());
}
sourcePath = sourcePath.subpath(ignoreSourcePaths, sourcePath.getNameCount());
outputPath = outputPath.subpath(ignoreOutputPaths, outputPath.getNameCount());
File sourceFile = sourcePath.toFile();
File outputFile = outputPath.toFile();
if (!(outputFile.getAbsoluteFile().getParentFile().mkdirs() || outputFile.getAbsoluteFile().getParentFile().exists())) {
patch.close();
throw new IOException("Failed to create " + outputFile.getAbsolutePath());
}
new JarPatcher(patchName, sourceFile.getName()).applyDelta(patch, new ZipFile(sourceFile), new ZipArchiveOutputStream(new FileOutputStream(outputFile)), list);
list.close();
}
/**
* Entry to new name.
*
* @param source the source
* @param name the name
* @return the zip archive entry
* @throws ZipException the zip exception
*/
private ZipArchiveEntry copyEntry(ZipArchiveEntry source) throws ZipException {
ZipArchiveEntry ret = new ZipArchiveEntry(source.getName());
byte[] extra = source.getExtra();
if (extra != null) {
ret.setExtraFields(ExtraFieldUtils.parse(extra, true, ExtraFieldUtils.UnparseableExtraField.READ));
} else {
ret.setExtra(ExtraFieldUtils.mergeLocalFileDataData(source.getExtraFields(true)));
}
ret.setInternalAttributes(source.getInternalAttributes());
ret.setExternalAttributes(source.getExternalAttributes());
ret.setExtraFields(source.getExtraFields(true));
return ret;
}
}
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