/*
* 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 java.nio.IntBuffer;
class ReversingMapper implements ReferenceMapper {
private ResourceTable resourceTable;
public ReversingMapper(ResourceTable resourceTable) {
this.resourceTable = resourceTable;
}
public static ReferenceMapper construct(ResourceTable resourceTable) {
return new ReversingMapper(resourceTable);
}
@Override
public int map(int id) {
int resPackage = id >> 24;
if (resPackage != ResTablePackage.APP_PACKAGE_ID) {
return id;
}
int resType = (id >> 16) & 0xFF;
int resId = id & 0xFFFF;
int entryCount = resourceTable.getPackage().getTypeSpec(resType).getEntryCount();
return (id & 0xFFFF0000) | (entryCount - resId - 1);
}
@Override
public void rewrite(int type, IntBuffer buf) {
for (int i = 0; i < buf.limit() / 2; i++) {
int o = buf.limit() - i - 1;
int t = buf.get(i);
buf.put(i, buf.get(o));
buf.put(o, t);
}
}
}