/*
 * Copyright (C) 2015 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.
 */

package com.android.tools.build.apkzlib.zip;

/**
 * Type of data descriptor that an entry has. Data descriptors are used if the CRC and sizing data
 * is not known when the data is being written and cannot be placed in the file's local header.
 * In those cases, after the file data itself, a data descriptor is placed after the entry's
 * contents.
 * <p>
 * While the zip specification says the data descriptor should be used but it is optional. We
 * record also whether the data descriptor contained the 4-byte signature at the start of the
 * block or not.
 */
public enum DataDescriptorType {
    /**
     * The entry has no data descriptor.
     */
    NO_DATA_DESCRIPTOR(0),

    /**
     * The entry has a data descriptor that does not contain a signature.
     */
    DATA_DESCRIPTOR_WITHOUT_SIGNATURE(12),

    /**
     * The entry has a data descriptor that contains a signature.
     */
    DATA_DESCRIPTOR_WITH_SIGNATURE(16);

    /**
     * The number of bytes the data descriptor spans.
     */
    public int size;

    /**
     * Creates a new data descriptor.
     *
     * @param size the number of bytes the data descriptor spans
     */
    DataDescriptorType(int size) {
        this.size = size;
    }
}