com.google.devrel.gmscore.tools.apk.arsc.ResourceFile.java Source code

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/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * 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.google.devrel.gmscore.tools.apk.arsc;

import com.google.common.io.ByteArrayDataOutput;
import com.google.common.io.ByteStreams;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/** Given an arsc file, maps the contents of the file. */
public final class ResourceFile implements SerializableResource {

    /** The chunks contained in this resource file. */
    private final List<Chunk> chunks = new ArrayList<>();

    public ResourceFile(byte[] buf) {
        ByteBuffer buffer = ByteBuffer.wrap(buf).order(ByteOrder.LITTLE_ENDIAN);
        while (buffer.remaining() > 0) {
            chunks.add(Chunk.newInstance(buffer));
        }
    }

    /**
     * Given an input stream, reads the stream until the end and returns a {@link ResourceFile}
     * representing the contents of the stream.
     *
     * @param is The input stream to read from.
     * @return ResourceFile represented by the @{link InputStream}.
     * @throws IOException
     */
    public static ResourceFile fromInputStream(InputStream is) throws IOException {
        byte[] buf = ByteStreams.toByteArray(is);
        return new ResourceFile(buf);
    }

    /** Returns the chunks in this resource file. */
    public List<Chunk> getChunks() {
        return Collections.unmodifiableList(chunks);
    }

    @Override
    public byte[] toByteArray() throws IOException {
        return toByteArray(false);
    }

    @Override
    public byte[] toByteArray(boolean shrink) throws IOException {
        ByteArrayDataOutput output = ByteStreams.newDataOutput();
        for (Chunk chunk : chunks) {
            output.write(chunk.toByteArray(shrink));
        }
        return output.toByteArray();
    }
}