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Android binary resources read/write library
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/*
 *  Copyright (C) 2022 github.com/REAndroid
 *
 *  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.reandroid.archive.block;

import com.reandroid.archive.ZipSignature;
import com.reandroid.utils.HexUtil;

public class DataDescriptor extends ZipHeader{
    public DataDescriptor() {
        super(MIN_LENGTH, ZipSignature.DATA_DESCRIPTOR);
    }

    public DataDescriptor copy(){
        DataDescriptor dd = new DataDescriptor();
        dd.setSignature(ZipSignature.DATA_DESCRIPTOR);
        dd.setCrc(getCrc());
        dd.setCompressedSize(getCompressedSize());
        dd.setSize(getSize());
        return dd;
    }

    public long getCrc(){
        return getIntegerUnsigned(OFFSET_crc);
    }
    public void setCrc(long value){
        putInteger(OFFSET_crc, value);
    }
    public long getCompressedSize(){
        return getIntegerUnsigned(OFFSET_compressed_size);
    }
    public void setCompressedSize(long value){
        putInteger(OFFSET_compressed_size, value);
    }
    public long getSize(){
        return getIntegerUnsigned(OFFSET_size);
    }
    public void setSize(long value){
        putInteger(OFFSET_size, value);
    }

    @Override
    public String toString(){
        StringBuilder builder = new StringBuilder();
        builder.append(getSignature());
        builder.append(", crc=").append(HexUtil.toHex8(getCrc()));
        builder.append(", compressed=").append(getCompressedSize());
        builder.append(", size=").append(getSize());
        return builder.toString();
    }
    public static DataDescriptor fromLocalFile(LocalFileHeader lfh){
        DataDescriptor dataDescriptor = new DataDescriptor();
        dataDescriptor.setSignature(ZipSignature.DATA_DESCRIPTOR);
        dataDescriptor.setSize(lfh.getSize());
        dataDescriptor.setCompressedSize(lfh.getCompressedSize());
        dataDescriptor.setCrc(lfh.getCrc());
        return dataDescriptor;
    }

    private static final int OFFSET_crc = 4;
    private static final int OFFSET_compressed_size = 8;
    private static final int OFFSET_size = 12;

    public static final int MIN_LENGTH = 16;
}