Java ByteBuffer Set setZipEocdCentralDirectoryOffset(ByteBuffer zipEndOfCentralDirectory, long offset)

Description

Sets the offset of the start of the ZIP Central Directory in the archive.

License

Apache License

Declaration

public static void setZipEocdCentralDirectoryOffset(ByteBuffer zipEndOfCentralDirectory, long offset) 

Method Source Code

//package com.java2s;
/*/*from  w w w. j a  va  2s . c  om*/
 * Copyright (C) 2016 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.
 */

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class Main {
    private static final int ZIP_EOCD_CENTRAL_DIR_OFFSET_FIELD_OFFSET = 16;

    /**
     * Sets the offset of the start of the ZIP Central Directory in the archive.
     *
     * <p>
     * NOTE: Byte order of {@code zipEndOfCentralDirectory} must be little-endian.
     */
    public static void setZipEocdCentralDirectoryOffset(ByteBuffer zipEndOfCentralDirectory, long offset) {
        assertByteOrderLittleEndian(zipEndOfCentralDirectory);
        setUnsignedInt32(zipEndOfCentralDirectory,
                zipEndOfCentralDirectory.position() + ZIP_EOCD_CENTRAL_DIR_OFFSET_FIELD_OFFSET, offset);
    }

    private static void assertByteOrderLittleEndian(ByteBuffer buffer) {
        if (buffer.order() != ByteOrder.LITTLE_ENDIAN) {
            throw new IllegalArgumentException("ByteBuffer byte order must be little endian");
        }
    }

    private static void setUnsignedInt32(ByteBuffer buffer, int offset, long value) {
        if ((value < 0) || (value > 0xffffffffL)) {
            throw new IllegalArgumentException("uint32 value of out range: " + value);
        }
        buffer.putInt(offset, (int) value);
    }
}

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