/*
* Copyright 2017-present Facebook, Inc.
*
* 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.facebook.buck.android.resources;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Maps;
import java.io.PrintStream;
import java.nio.ByteBuffer;
import java.util.Comparator;
import java.util.Map;
import java.util.stream.IntStream;
/**
* A ResourceTable is the top-level representation of resources.arsc. It consists of a header:
* ResTable_header u32 chunk_type u32 header_size u32 chunk_size u32 package_count
*
* <p>The header is followed by a StringPool and then package_count packages.
*
* <p>In practice, aapt always generates .arsc files with package_count == 1.
*/
public class ResourceTable extends ResChunk {
public static final int HEADER_SIZE = 12;
private final StringPool strings;
private final ResTablePackage resPackage;
public ResourceTable(StringPool strings, ResTablePackage resPackage) {
super(
CHUNK_RESOURCE_TABLE,
HEADER_SIZE,
HEADER_SIZE + strings.getChunkSize() + resPackage.getChunkSize());
this.strings = strings;
this.resPackage = resPackage;
}
public static ResourceTable get(ByteBuffer buf) {
int type = buf.getShort();
int headerSize = buf.getShort();
int chunkSize = buf.getInt();
int packageCount = buf.getInt();
Preconditions.checkState(type == CHUNK_RESOURCE_TABLE);
Preconditions.checkState(headerSize == HEADER_SIZE);
Preconditions.checkState(packageCount == 1);
StringPool strings = StringPool.get(slice(buf, buf.position()));
ResTablePackage resPackage =
ResTablePackage.get(slice(buf, HEADER_SIZE + strings.getChunkSize()));
Preconditions.checkState(
chunkSize == HEADER_SIZE + strings.getChunkSize() + resPackage.getChunkSize());
return new ResourceTable(strings, resPackage);
}
@Override
public void put(ByteBuffer buf) {
putChunkHeader(buf);
buf.putInt(1); // packageCount
Preconditions.checkState(buf.position() == HEADER_SIZE);
strings.put(buf);
Preconditions.checkState(buf.position() == HEADER_SIZE + strings.getChunkSize());
resPackage.put(buf);
}
public void reassignIds(ReferenceMapper refMapping) {
resPackage.reassignIds(refMapping);
}
public static ResourceTable slice(ResourceTable table, Map<Integer, Integer> countsToExtract) {
ResTablePackage newPackage = ResTablePackage.slice(table.resPackage, countsToExtract);
StringPool strings = table.strings;
// Figure out what strings are used by the retained references.
ImmutableSortedSet.Builder<Integer> stringRefs =
ImmutableSortedSet.orderedBy(
Comparator.comparing(strings::getString).thenComparingInt(i -> i));
newPackage.visitStringReferences(stringRefs::add);
ImmutableList<Integer> stringsToExtract = stringRefs.build().asList();
ImmutableMap<Integer, Integer> stringMapping =
Maps.uniqueIndex(
IntStream.range(0, stringsToExtract.size())::iterator, stringsToExtract::get);
// Extract a StringPool that contains just the strings used by the new package.
// This drops styles.
StringPool newStrings =
StringPool.create(stringsToExtract.stream().map(strings::getString)::iterator);
// Adjust the string references.
newPackage.transformStringReferences(stringMapping::get);
return new ResourceTable(newStrings, newPackage);
}
public void dump(PrintStream out) {
out.format("Package Groups (1)\n");
resPackage.dump(strings, out);
}
public StringPool getStrings() {
return strings;
}
public ResTablePackage getPackage() {
return resPackage;
}
public void dumpStrings(PrintStream out) {
strings.dump(out);
}
}