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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.android.ziputils;
import static com.google.devtools.build.android.ziputils.DataDescriptor.EXTCRC;
import static com.google.devtools.build.android.ziputils.DataDescriptor.EXTLEN;
import static com.google.devtools.build.android.ziputils.DataDescriptor.EXTSIZ;
import static com.google.devtools.build.android.ziputils.DirectoryEntry.CENCRC;
import static com.google.devtools.build.android.ziputils.DirectoryEntry.CENLEN;
import static com.google.devtools.build.android.ziputils.DirectoryEntry.CENSIZ;
import static com.google.devtools.build.android.ziputils.DirectoryEntry.CENTIM;
import static com.google.devtools.build.android.ziputils.LocalFileHeader.LOCFLG;
import static com.google.devtools.build.android.ziputils.LocalFileHeader.LOCTIM;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionsBase;
import com.google.devtools.common.options.OptionsParser;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
/**
* Command-line entry point for the dex reducer utility. This utility extracts .dex files
* from one or more archives, and packaging them in a single output archive, renaming entries
* to: classes.dex, classes2.dex, ...
*
* <p>This utility is intended used to consolidate the result of compiling the output produced
* by the dex mapper utility.</p>
*/
public class DexReducer implements EntryHandler {
private static final String SUFFIX = ".dex";
private static final String BASENAME = "classes";
private ZipOut out;
private int count = 0;
private String outFile;
private List<String> paths;
DexReducer() {
outFile = null;
paths = new ArrayList<>();
}
/**
* Command-line entry point.
* @param args
*/
public static void main(String[] args) {
try {
DexReducer dexDexReducer = new DexReducer();
dexDexReducer.parseArguments(args);
dexDexReducer.run();
} catch (Exception ex) {
System.err.println("DexReducer threw exception: " + ex.getMessage());
System.exit(1);
}
}
private void parseArguments(String[] args) {
OptionsParser optionsParser = OptionsParser.newOptionsParser(Options.class);
optionsParser.parseAndExitUponError(args);
Options options = optionsParser.getOptions(Options.class);
paths = options.inputZips;
outFile = options.outputZip;
}
private void run() throws IOException {
out = new ZipOut(new FileOutputStream(outFile, false).getChannel(), outFile);
for (String filename : paths) {
ZipIn in = new ZipIn(new FileInputStream(filename).getChannel(), filename);
in.scanEntries(this);
}
out.close();
}
@Override
public void handle(ZipIn in, LocalFileHeader header, DirectoryEntry dirEntry, ByteBuffer data)
throws IOException {
String path = header.getFilename();
if (!path.endsWith(".dex")) {
return;
}
count++;
String filename = BASENAME + (count == 1 ? "" : Integer.toString(count)) + SUFFIX;
String comment = dirEntry.getComment();
byte[] extra = dirEntry.getExtraData();
out.nextEntry(dirEntry.clone(filename, extra, comment).set(CENTIM, DosTime.EPOCH.time));
out.write(header.clone(filename, extra).set(LOCTIM, DosTime.EPOCH.time));
out.write(data);
if ((header.get(LOCFLG) & LocalFileHeader.SIZE_MASKED_FLAG) != 0) {
DataDescriptor desc = DataDescriptor.allocate()
.set(EXTCRC, dirEntry.get(CENCRC))
.set(EXTSIZ, dirEntry.get(CENSIZ))
.set(EXTLEN, dirEntry.get(CENLEN));
out.write(desc);
}
}
/**
* Commandline options.
*/
public static class Options extends OptionsBase {
@Option(name = "input_zip",
defaultValue = "null",
category = "input",
allowMultiple = true,
abbrev = 'i',
help = "Input zip file containing entries to collect and enumerate.")
public List<String> inputZips;
@Option(name = "output_zip",
defaultValue = "null",
category = "output",
abbrev = 'o',
help = "Output zip file, containing enumerated entries.")
public String outputZip;
}
}
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