Android Open Source - JiangHomeStyle_Android_Phone Nio Zip Encoding

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License

The source code is released under:

Apache License

Java Source Code

/*
 * 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  ww  .  j  a  v  a  2  s. co  m*/
 * 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;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.CodingErrorAction;

/**
 * A ZipEncoding, which uses a java.nio {@link java.nio.charset.Charset Charset}
 * to encode names.
 * 
 * <p>
 * This implementation works for all cases under java-1.5 or later. However, in
 * java-1.4, some charsets don't have a java.nio implementation, most notably
 * the default ZIP encoding Cp437.
 * </p>
 * 
 * <p>
 * The methods of this class are reentrant.
 * </p>
 */
class NioZipEncoding implements ZipEncoding
{
  private final Charset charset;

  /**
   * Construct an NIO based zip encoding, which wraps the given charset.
   * 
   * @param charset
   *            The NIO charset to wrap.
   */
  public NioZipEncoding(Charset charset)
  {
    this.charset = charset;
  }

  /**
   * @see org.apache.tools.zip.ZipEncoding#canEncode(java.lang.String)
   */
  public boolean canEncode(String name)
  {
    CharsetEncoder enc = this.charset.newEncoder();
    enc.onMalformedInput(CodingErrorAction.REPORT);
    enc.onUnmappableCharacter(CodingErrorAction.REPORT);

    return enc.canEncode(name);
  }

  /**
   * @see org.apache.tools.zip.ZipEncoding#encode(java.lang.String)
   */
  public ByteBuffer encode(String name)
  {
    CharsetEncoder enc = this.charset.newEncoder();

    enc.onMalformedInput(CodingErrorAction.REPORT);
    enc.onUnmappableCharacter(CodingErrorAction.REPORT);

    CharBuffer cb = CharBuffer.wrap(name);
    ByteBuffer out = ByteBuffer.allocate(name.length() + (name.length() + 1) / 2);

    while (cb.remaining() > 0)
    {
      CoderResult res = enc.encode(cb, out, true);

      if (res.isUnmappable() || res.isMalformed())
      {

        // write the unmappable characters in utf-16
        // pseudo-URL encoding style to ByteBuffer.
        if (res.length() * 6 > out.remaining())
        {
          out = ZipEncodingHelper.growBuffer(out, out.position() + res.length() * 6);
        }

        for (int i = 0; i < res.length(); ++i)
        {
          ZipEncodingHelper.appendSurrogate(out, cb.get());
        }

      }
      else if (res.isOverflow())
      {

        out = ZipEncodingHelper.growBuffer(out, 0);

      }
      else if (res.isUnderflow())
      {

        enc.flush(out);
        break;

      }
    }

    out.limit(out.position());
    out.rewind();
    return out;
  }

  /**
   * @see org.apache.tools.zip.ZipEncoding#decode(byte[])
   */
  public String decode(byte[] data) throws IOException
  {
    return this.charset.newDecoder().onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT).decode(ByteBuffer.wrap(data)).toString();
  }
}

Java Source Code List

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