Android Open Source - JiangHomeStyle_Android_Phone Unparseable Extra Field Data

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Apache License

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 */*from w w w  .j a  v  a2  s . c  om*/
 * 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 org.apache.tools.zip;

/**
 * Wrapper for extra field data that doesn't conform to the recommended format
 * of header-tag + size + data.
 * 
 * <p>
 * The header-id is artificial (and not listed as a known ID in
 * {@link <a href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT"> APPNOTE.TXT</a>}
 * ). Since it isn't used anywhere except to satisfy the ZipExtraField contract
 * it shouldn't matter anyway.
 * </p>
 * 
 * @since Ant 1.8.1
 */
public final class UnparseableExtraFieldData implements CentralDirectoryParsingZipExtraField
{

  private static final ZipShort HEADER_ID = new ZipShort(0xACC1);

  private byte[] localFileData;
  private byte[] centralDirectoryData;

  /**
   * The Header-ID.
   * 
   * @return a completely arbitrary value that should be ignored.
   */
  public ZipShort getHeaderId()
  {
    return HEADER_ID;
  }

  /**
   * Length of the complete extra field in the local file data.
   * 
   * @return The LocalFileDataLength value
   */
  public ZipShort getLocalFileDataLength()
  {
    return new ZipShort(localFileData == null ? 0 : localFileData.length);
  }

  /**
   * Length of the complete extra field in the central directory.
   * 
   * @return The CentralDirectoryLength value
   */
  public ZipShort getCentralDirectoryLength()
  {
    return centralDirectoryData == null ? getLocalFileDataLength() : new ZipShort(centralDirectoryData.length);
  }

  /**
   * The actual data to put into local file data.
   * 
   * @return The LocalFileDataData value
   */
  public byte[] getLocalFileDataData()
  {
    return ZipUtil.copy(localFileData);
  }

  /**
   * The actual data to put into central directory.
   * 
   * @return The CentralDirectoryData value
   */
  public byte[] getCentralDirectoryData()
  {
    return centralDirectoryData == null ? getLocalFileDataData() : ZipUtil.copy(centralDirectoryData);
  }

  /**
   * Populate data from this array as if it was in local file data.
   * 
   * @param buffer
   *            the buffer to read data from
   * @param offset
   *            offset into buffer to read data
   * @param length
   *            the length of data
   */
  public void parseFromLocalFileData(byte[] buffer, int offset, int length)
  {
    localFileData = new byte[length];
    System.arraycopy(buffer, offset, localFileData, 0, length);
  }

  /**
   * Populate data from this array as if it was in central directory data.
   * 
   * @param buffer
   *            the buffer to read data from
   * @param offset
   *            offset into buffer to read data
   * @param length
   *            the length of data
   */
  public void parseFromCentralDirectoryData(byte[] buffer, int offset, int length)
  {
    centralDirectoryData = new byte[length];
    System.arraycopy(buffer, offset, centralDirectoryData, 0, length);
    if (localFileData == null)
    {
      parseFromLocalFileData(buffer, offset, length);
    }
  }

}

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