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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 libcore.tzdata.update;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
/**
* A configuration bundle. This is a thin wrapper around some in-memory bytes representing a zip
* archive and logic for its safe extraction.
*/
public final class ConfigBundle {
/** The name of the file inside the bundle containing the TZ data version. */
public static final String TZ_DATA_VERSION_FILE_NAME = "tzdata_version";
/** The name of the file inside the bundle containing the expected device checksums. */
public static final String CHECKSUMS_FILE_NAME = "checksums";
/** The name of the file inside the bundle containing bionic/libcore TZ data. */
public static final String ZONEINFO_FILE_NAME = "tzdata";
/** The name of the file inside the bundle containing ICU TZ data. */
public static final String ICU_DATA_FILE_NAME = "icu/icu_tzdata.dat";
private static final int BUFFER_SIZE = 8192;
private final byte[] bytes;
public ConfigBundle(byte[] bytes) {
this.bytes = bytes;
}
public byte[] getBundleBytes() {
return bytes;
}
public void extractTo(File targetDir) throws IOException {
extractZipSafely(new ByteArrayInputStream(bytes), targetDir, true /* makeWorldReadable */);
}
/** Visible for testing */
static void extractZipSafely(InputStream is, File targetDir, boolean makeWorldReadable)
throws IOException {
// Create the extraction dir, if needed.
FileUtils.ensureDirectoriesExist(targetDir, makeWorldReadable);
try (ZipInputStream zipInputStream = new ZipInputStream(is)) {
byte[] buffer = new byte[BUFFER_SIZE];
ZipEntry entry;
while ((entry = zipInputStream.getNextEntry()) != null) {
// Validate the entry name: make sure the unpacked file will exist beneath the
// targetDir.
String name = entry.getName();
File entryFile = FileUtils.createSubFile(targetDir, name);
if (entry.isDirectory()) {
FileUtils.ensureDirectoriesExist(entryFile, makeWorldReadable);
} else {
// Create the path if there was no directory entry.
if (!entryFile.getParentFile().exists()) {
FileUtils.ensureDirectoriesExist(
entryFile.getParentFile(), makeWorldReadable);
}
try (FileOutputStream fos = new FileOutputStream(entryFile)) {
int count;
while ((count = zipInputStream.read(buffer)) != -1) {
fos.write(buffer, 0, count);
}
// sync to disk
fos.getFD().sync();
}
// mark entryFile -rw-r--r--
if (makeWorldReadable) {
FileUtils.makeWorldReadable(entryFile);
}
}
}
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
ConfigBundle that = (ConfigBundle) o;
if (!Arrays.equals(bytes, that.bytes)) {
return false;
}
return true;
}
}
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