including jazzlib into classpath tree

1 files changed, 216 insertions, 0 deletions

diff --git a/java/util/zip/InflaterInputStream.java b/java/util/zip/InflaterInputStream.java
new file mode 100644
index 000000000..eca75e8c1
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+++ b/java/util/zip/InflaterInputStream.java
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+/* java.util.zip.InflaterInputStream
+   Copyright (C) 2001 Free Software Foundation, Inc.
+
+This file is part of Jazzlib.
+
+Jazzlib is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+Jazzlib is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+package java.util.zip;
+
+import java.io.FilterInputStream;
+import java.io.InputStream;
+import java.io.IOException;
+
+/**
+ * This filter stream is used to decompress data compressed in the "deflate"
+ * format. The "deflate" format is described in RFC 1951.
+ *
+ * This stream may form the basis for other decompression filters, such
+ * as the <code>GZIPInputStream</code>.
+ *
+ * @author John Leuner
+ * @since JDK 1.1
+ */
+
+public class InflaterInputStream extends FilterInputStream {
+
+  //Variables
+
+  /**
+   * Decompressor for this filter 
+   */
+
+  protected Inflater inf;
+
+  /**
+   * Byte array used as a buffer 
+   */
+
+  protected byte[] buf;
+
+  /**
+   * Size of buffer   
+   */
+
+  protected int len;
+
+
+  //We just use this if we are decoding one byte at a time with the read() call
+
+  private byte[] onebytebuffer = new byte[1];
+
+  //Constructors
+
+
+  /**
+   * Create an InflaterInputStream with the default decompresseor
+   * and a default buffer size.
+   *
+   * @param in the InputStream to read bytes from
+   */
+
+  public InflaterInputStream(InputStream in) 
+  {
+    this(in, new Inflater(), 4096);
+  }
+
+  /**
+   * Create an InflaterInputStream with the specified decompresseor
+   * and a default buffer size.
+   *
+   * @param in the InputStream to read bytes from
+   * @param inf the decompressor used to decompress data read from in
+   */
+
+  public InflaterInputStream(InputStream in, Inflater inf) 
+  {
+    this(in, inf, 4096);
+  }
+
+  /**
+   * Create an InflaterInputStream with the specified decompresseor
+   * and a specified buffer size.
+   *
+   * @param in the InputStream to read bytes from
+   * @param inf the decompressor used to decompress data read from in
+   * @param size size of the buffer to use
+   */
+
+  public InflaterInputStream(InputStream in, Inflater inf, int size) 
+  {
+    super(in);
+    this.inf = inf;
+    this.len = 0;
+    
+    if (size <= 0)
+      throw new IllegalArgumentException("size <= 0");
+    buf = new byte[size]; //Create the buffer
+  }
+
+  //Methods
+
+  /**
+   * Returns 0 once the end of the stream (EOF) has been reached.
+   * Otherwise returns 1.
+   */
+
+  public int available() throws IOException
+  {
+    return inf.finished() ? 0 : 1;
+  }
+
+  /**
+   * Closes the input stream
+   */
+  public void close() throws IOException
+  {
+    in.close();
+  }
+
+  /**
+   * Fills the buffer with more data to decompress.
+   */
+  protected void fill() throws IOException
+  {
+    len = in.read(buf, 0, buf.length);
+
+    if (len < 0)
+      throw new ZipException("Deflated stream ends early.");
+    inf.setInput(buf, 0, len);
+  }
+
+  /**
+   * Reads one byte of decompressed data.
+   *
+   * The byte is in the lower 8 bits of the int.
+   */
+  public int read() throws IOException
+  { 
+    int nread = read(onebytebuffer, 0, 1); //read one byte
+    if (nread > 0)
+      return onebytebuffer[0] & 0xff;
+    return -1;
+  }
+
+  /**
+   * Decompresses data into the byte array
+   *
+   *
+   * @param b the array to read and decompress data into
+   * @param off the offset indicating where the data should be placed
+   * @param len the number of bytes to decompress
+   */
+  public int read(byte[] b, int off, int len) throws IOException
+  {
+    for (;;)
+      {
+	int count;
+	try
+	  {
+	    count = inf.inflate(b, off, len);
+	  } 
+	catch (DataFormatException dfe) 
+	  {
+	    throw new ZipException(dfe.getMessage());
+	  }
+
+	if (count > 0)
+	  return count;
+	
+	if (inf.needsDictionary())
+	  throw new ZipException("Need a dictionary");
+	else if (inf.finished())
+	  return -1;
+	else if (inf.needsInput())
+	  fill();
+	else
+	  throw new InternalError("Don't know what to do");
+      }
+  }
+
+  /**
+   * Skip specified number of bytes of uncompressed data
+   *
+   * @param n number of bytes to skip
+   */
+
+  public long skip(long n) throws IOException
+  {
+    if (n < 0)
+      throw new IllegalArgumentException();
+    int len = 2048;
+    if (n < len)
+      len = (int) n;
+    byte[] tmp = new byte[len];
+    return (long) read(tmp);
+  }
+}