| /* |
| * 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.shared2; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| 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 time zone distro. This is a thin wrapper around some in-memory bytes representing a zip |
| * archive and logic for its safe extraction. |
| */ |
| public final class TimeZoneDistro { |
| |
| /** The name of the file inside the distro containing bionic/libcore TZ data. */ |
| public static final String TZDATA_FILE_NAME = "tzdata"; |
| |
| /** The name of the file inside the distro containing ICU TZ data. */ |
| public static final String ICU_DATA_FILE_NAME = "icu/icu_tzdata.dat"; |
| |
| /** The name of the file inside the distro containing time zone lookup data. */ |
| public static final String TZLOOKUP_FILE_NAME = "tzlookup.xml"; |
| |
| /** |
| * The name of the file inside the distro containing the distro version information. |
| * The content is ASCII bytes representing a set of version numbers. See {@link DistroVersion}. |
| * This constant must match the one in system/core/tzdatacheck/tzdatacheck.cpp. |
| */ |
| public static final String DISTRO_VERSION_FILE_NAME = "distro_version"; |
| |
| private static final int BUFFER_SIZE = 8192; |
| |
| /** |
| * Maximum size of entry getEntryContents() will pull into a byte array. To avoid exhausting |
| * heap memory when encountering unexpectedly large entries. 128k should be enough for anyone. |
| */ |
| private static final long MAX_GET_ENTRY_CONTENTS_SIZE = 128 * 1024; |
| |
| private final byte[] bytes; |
| |
| public TimeZoneDistro(byte[] bytes) { |
| this.bytes = bytes; |
| } |
| |
| public byte[] getBytes() { |
| return bytes; |
| } |
| |
| public DistroVersion getDistroVersion() throws DistroException, IOException { |
| byte[] contents = getEntryContents( |
| new ByteArrayInputStream(bytes), DISTRO_VERSION_FILE_NAME); |
| if (contents == null) { |
| throw new DistroException("Distro version file entry not found"); |
| } |
| return DistroVersion.fromBytes(contents); |
| } |
| |
| private static byte[] getEntryContents(InputStream is, String entryName) throws IOException { |
| try (ZipInputStream zipInputStream = new ZipInputStream(is)) { |
| ZipEntry entry; |
| while ((entry = zipInputStream.getNextEntry()) != null) { |
| String name = entry.getName(); |
| |
| if (!entryName.equals(name)) { |
| continue; |
| } |
| // Guard against massive entries consuming too much heap memory. |
| if (entry.getSize() > MAX_GET_ENTRY_CONTENTS_SIZE) { |
| throw new IOException("Entry " + entryName + " too large: " + entry.getSize()); |
| } |
| byte[] buffer = new byte[BUFFER_SIZE]; |
| try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) { |
| int count; |
| while ((count = zipInputStream.read(buffer)) != -1) { |
| baos.write(buffer, 0, count); |
| } |
| return baos.toByteArray(); |
| } |
| } |
| // Entry not found. |
| return null; |
| } |
| } |
| |
| 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(); |
| // Note, we assume that nothing will quickly insert a symlink after createSubFile() |
| // that might invalidate the guarantees about name existing beneath targetDir. |
| 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; |
| } |
| |
| TimeZoneDistro that = (TimeZoneDistro) o; |
| |
| if (!Arrays.equals(bytes, that.bytes)) { |
| return false; |
| } |
| |
| return true; |
| } |
| } |