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/*
* Copyright 2016, Google LLC
*
* 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 Google LLC 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER OR CONTRIBUTORS 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 com.android.tools.smali.dexlib2.dexbacked;
import com.android.tools.smali.dexlib2.Opcodes;
import com.android.tools.smali.dexlib2.iface.DexFile;
import com.android.tools.smali.dexlib2.iface.MultiDexContainer;
import com.android.tools.smali.dexlib2.util.DexUtil;
import com.android.tools.smali.dexlib2.util.DexUtil.InvalidFile;
import com.android.tools.smali.dexlib2.util.DexUtil.UnsupportedFile;
import com.google.common.collect.Lists;
import com.google.common.io.ByteStreams;
import com.android.tools.smali.dexlib2.dexbacked.DexBackedDexFile.NotADexFile;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
/**
* Represents a zip file that contains dex files (i.e. an apk or jar file)
*/
public class ZipDexContainer implements MultiDexContainer<DexBackedDexFile> {
private final File zipFilePath;
@Nullable private final Opcodes opcodes;
private TreeMap<String, DexBackedDexFile> entries;
/**
* Constructs a new ZipDexContainer for the given zip file
*
* @param zipFilePath The path to the zip file
*/
public ZipDexContainer(@Nonnull File zipFilePath, @Nullable Opcodes opcodes) {
this.zipFilePath = zipFilePath;
this.opcodes = opcodes;
}
/**
* Gets a list of the names of dex files in this zip file.
*
* @return A list of the names of dex files in this zip file
*/
@Nonnull @Override public List<String> getDexEntryNames() throws IOException {
return new ArrayList<>(getEntries().keySet());
}
private Map<String, DexBackedDexFile> getEntries() throws IOException {
if (entries != null) {
return entries;
}
entries = new TreeMap<String, DexBackedDexFile>();
ZipFile zipFile = getZipFile();
try {
Enumeration<? extends ZipEntry> entriesEnumeration = zipFile.entries();
while (entriesEnumeration.hasMoreElements()) {
ZipEntry entry = entriesEnumeration.nextElement();
if (!isDex(zipFile, entry)) {
continue;
}
// There might be several dex files in zip entry since DEX v41.
InputStream inputStream = zipFile.getInputStream(entry);
try {
byte[] buf = ByteStreams.toByteArray(inputStream);
for (int offset = 0, i = 1; offset < buf.length; i++) {
DexBackedDexFile dex = new DexBackedDexFile(opcodes, buf, 0, true, offset);
entries.put(entry.getName() + (i > 1 ? ("/" + i) : ""), dex);
offset += dex.getFileSize();
};
} finally {
inputStream.close();
}
}
return entries;
} finally {
zipFile.close();
}
}
/**
* Loads a dex file from a specific named entry.
*
* @param entryName The name of the entry
* @return A ZipDexFile, or null if there is no entry with the given name
* @throws NotADexFile If the entry isn't a dex file
*/
@Nullable @Override public DexEntry<DexBackedDexFile> getEntry(@Nonnull String entryName) throws IOException {
DexFile dexFile = getEntries().get(entryName);
return new DexEntry() {
@Nonnull
@Override
public String getEntryName() {
return entryName;
}
@Nonnull
@Override
public DexFile getDexFile() {
return dexFile;
}
@Nonnull
@Override
public MultiDexContainer getContainer() {
return ZipDexContainer.this;
}
};
}
public boolean isZipFile() {
ZipFile zipFile = null;
try {
zipFile = getZipFile();
return true;
} catch (IOException ex) {
return false;
} catch (NotAZipFileException ex) {
return false;
} finally {
if(zipFile != null) {
try {
zipFile.close();
} catch (IOException ex) {
// just eat it
}
}
}
}
protected boolean isDex(@Nonnull ZipFile zipFile, @Nonnull ZipEntry zipEntry) throws IOException {
InputStream inputStream = new BufferedInputStream(zipFile.getInputStream(zipEntry));
try {
DexUtil.verifyDexHeader(inputStream);
} catch (NotADexFile ex) {
return false;
} catch (InvalidFile ex) {
return false;
} catch (UnsupportedFile ex) {
return false;
} finally {
inputStream.close();
}
return true;
}
protected ZipFile getZipFile() throws IOException {
try {
return new ZipFile(zipFilePath);
} catch (IOException ex) {
throw new NotAZipFileException();
}
}
public static class NotAZipFileException extends RuntimeException {
}
}
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