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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [javax/] [imageio/] [stream/] [MemoryCacheImageInputStream.java] - Blame information for rev 772

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1 772 jeremybenn
/* MemoryCacheImageInputStream.java --
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   Copyright (C) 2004  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.imageio.stream;
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import java.io.BufferedInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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 * @author Michael Koch (konqueror@gmx.de)
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 */
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public class MemoryCacheImageInputStream extends ImageInputStreamImpl
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{
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  private InputStream stream;
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  private BufferedInputStream buffer;
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  private int READLIMIT = 2048;
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  public MemoryCacheImageInputStream(InputStream stream)
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  {
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    this.stream = stream;
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    buffer = new BufferedInputStream(stream);
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    buffer.mark(READLIMIT);
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  }
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  public void close()
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    throws IOException
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  {
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    super.close();
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    stream.close();
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  }
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  public void flushBefore(long position)
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    throws IOException
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  {
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    long prevFlushedPosition = getFlushedPosition();
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    super.flushBefore(position);
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    buffer.reset();
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    buffer.skip(getFlushedPosition() - prevFlushedPosition);
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    buffer.mark(READLIMIT);
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  }
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  public boolean isCached()
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  {
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    return true;
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  }
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  public boolean isCachedFile()
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  {
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    return false;
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  }
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  public boolean isCachedMemory()
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  {
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    return true;
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  }
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  public int read()
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    throws IOException
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  {
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    setBitOffset(0);
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    int retval = buffer.read();
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    if (retval != -1)
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      streamPos++;
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    return retval;
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  }
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  public int read(byte[] data, int offset, int len)
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    throws IOException
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  {
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    setBitOffset(0);
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    int retval = buffer.read(data, offset, len);
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    if (retval != -1)
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      {
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        streamPos += retval;
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      }
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    return retval;
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  }
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  public void seek(long position)
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  throws IOException
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  {
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    super.seek(position);
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    buffer.reset();
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    buffer.skip(position - getFlushedPosition());
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  }
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}

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