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1 files changed, 332 insertions, 0 deletions

diff --git a/libjava/java/io/InputStreamReader.java b/libjava/java/io/InputStreamReader.java
new file mode 100644
index 000000000..91568c5cc
--- /dev/null
+++ b/libjava/java/io/InputStreamReader.java
@@ -0,0 +1,332 @@
+/* InputStreamReader.java -- Reader than transforms bytes to chars
+   Copyright (C) 1998, 1999, 2001, 2003, 2004, 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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.
+ 
+GNU Classpath 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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.io;
+
+import gnu.gcj.convert.*;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+
+/**
+ * This class reads characters from a byte input stream.   The characters
+ * read are converted from bytes in the underlying stream by a 
+ * decoding layer.  The decoding layer transforms bytes to chars according
+ * to an encoding standard.  There are many available encodings to choose 
+ * from.  The desired encoding can either be specified by name, or if no
+ * encoding is selected, the system default encoding will be used.  The
+ * system default encoding name is determined from the system property
+ * <code>file.encoding</code>.  The only encodings that are guaranteed to 
+ * be availalbe are "8859_1" (the Latin-1 character set) and "UTF8".
+ * Unforunately, Java does not provide a mechanism for listing the
+ * ecodings that are supported in a given implementation.
+ * <p>
+ * Here is a list of standard encoding names that may be available:
+ * <p>
+ * <ul>
+ * <li>8859_1 (ISO-8859-1/Latin-1)</li>
+ * <li>8859_2 (ISO-8859-2/Latin-2)</li>
+ * <li>8859_3 (ISO-8859-3/Latin-3)</li>
+ * <li>8859_4 (ISO-8859-4/Latin-4)</li>
+ * <li>8859_5 (ISO-8859-5/Latin-5)</li>
+ * <li>8859_6 (ISO-8859-6/Latin-6)</li>
+ * <li>8859_7 (ISO-8859-7/Latin-7)</li>
+ * <li>8859_8 (ISO-8859-8/Latin-8)</li>
+ * <li>8859_9 (ISO-8859-9/Latin-9)</li>
+ * <li>ASCII (7-bit ASCII)</li>
+ * <li>UTF8 (UCS Transformation Format-8)</li>
+ * <li>More later</li>
+ * </ul>
+ * <p>
+ * It is recommended that applications do not use 
+ * <code>InputStreamReader</code>'s
+ * directly.  Rather, for efficiency purposes, an object of this class
+ * should be wrapped by a <code>BufferedReader</code>.
+ * <p>
+ * Due to a deficiency the Java class library design, there is no standard
+ * way for an application to install its own byte-character encoding.
+ *
+ * @see BufferedReader
+ * @see InputStream
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @author Per Bothner (bothner@cygnus.com)
+ * @date April 22, 1998.  
+ */
+public class InputStreamReader extends Reader
+{
+  BufferedInputStream in;
+
+  // Buffer of chars read from in and converted but not consumed.
+  char[] work;
+  // Next available character (in work buffer) to read.
+  int wpos;
+  // Last available character (in work buffer) to read.
+  int wcount;
+
+  /*
+   * This is the byte-character decoder class that does the reading and
+   * translation of bytes from the underlying stream.
+   */
+  BytesToUnicode converter;
+
+  /**
+   * This method initializes a new instance of <code>InputStreamReader</code>
+   * to read from the specified stream using the default encoding.
+   *
+   * @param in The <code>InputStream</code> to read from 
+   */
+  public InputStreamReader(InputStream in)
+  {
+    this(in, BytesToUnicode.getDefaultDecoder());
+  }
+
+  /**
+   * This method initializes a new instance of <code>InputStreamReader</code>
+   * to read from the specified stream using a caller supplied character
+   * encoding scheme.  Note that due to a deficiency in the Java language
+   * design, there is no way to determine which encodings are supported.
+   * 
+   * @param in The <code>InputStream</code> to read from
+   * @param encoding_name The name of the encoding scheme to use
+   *
+   * @exception UnsupportedEncodingException If the encoding scheme 
+   * requested is not available.
+   */
+  public InputStreamReader(InputStream in, String encoding_name)
+    throws UnsupportedEncodingException
+  {
+    this(in, BytesToUnicode.getDecoder(encoding_name));
+  }
+
+  /**
+   * Creates an InputStreamReader that uses a decoder of the given
+   * charset to decode the bytes in the InputStream into
+   * characters.
+   */
+  public InputStreamReader(InputStream in, Charset charset)
+  {
+    this(in, new BytesToCharsetAdaptor(charset));
+  }
+
+  /**
+   * Creates an InputStreamReader that uses the given charset decoder
+   * to decode the bytes in the InputStream into characters.
+   */
+  public InputStreamReader(InputStream in, CharsetDecoder decoder)
+  {
+    this(in, new BytesToCharsetAdaptor(decoder));
+  }
+
+  private InputStreamReader(InputStream in, BytesToUnicode decoder)
+  {
+    // FIXME: someone could pass in a BufferedInputStream whose buffer
+    // is smaller than the longest encoded character for this
+    // encoding.  We will probably go into an infinite loop in this
+    // case.  We probably ought to just have our own byte buffering
+    // here.
+    this.in = in instanceof BufferedInputStream
+              ? (BufferedInputStream) in
+              : new BufferedInputStream(in);
+    /* Don't need to call super(in) here as long as the lock gets set. */
+    this.lock = in;
+    converter = decoder;
+    converter.setInput(this.in.buf, 0, 0);
+  }
+
+  /**
+   * This method closes this stream, as well as the underlying 
+   * <code>InputStream</code>.
+   *
+   * @exception IOException If an error occurs
+   */
+  public void close() throws IOException
+  {
+    synchronized (lock)
+      {
+	if (in != null)
+	  in.close();
+	in = null;
+	work = null;
+	wpos = wcount = 0;
+      }
+  }
+
+  /**
+   * This method returns the name of the encoding that is currently in use
+   * by this object.  If the stream has been closed, this method is allowed
+   * to return <code>null</code>.
+   *
+   * @return The current encoding name
+   */
+  public String getEncoding()
+  {
+    return in != null ? converter.getName() : null;
+  }
+
+  /**
+   * This method checks to see if the stream is read to be read.  It
+   * will return <code>true</code> if is, or <code>false</code> if it is not.
+   * If the stream is not ready to be read, it could (although is not required
+   * to) block on the next read attempt.
+   *
+   * @return <code>true</code> if the stream is ready to be read, 
+   * <code>false</code> otherwise
+   *
+   * @exception IOException If an error occurs
+   */
+  public boolean ready() throws IOException
+  {
+    synchronized (lock)
+      {
+	if (in == null)
+	  throw new IOException("Stream closed");
+
+	if (wpos < wcount)
+	  return true;
+
+	// According to the spec, an InputStreamReader is ready if its
+	// input buffer is not empty (above), or if bytes are
+	// available on the underlying byte stream.
+	return in.available () > 0;
+      }
+  }
+
+  /**
+   * This method reads up to <code>length</code> characters from the stream into
+   * the specified array starting at index <code>offset</code> into the
+   * array.
+   *
+   * @param buf The character array to recieve the data read
+   * @param offset The offset into the array to start storing characters
+   * @param length The requested number of characters to read.
+   *
+   * @return The actual number of characters read, or -1 if end of stream.
+   *
+   * @exception IOException If an error occurs
+   */
+  public int read (char[] buf, int offset, int length) throws IOException
+  {
+    synchronized (lock)
+      {
+	if (in == null)
+	  throw new IOException("Stream closed");
+
+	if (length == 0)
+	  return 0;
+
+	int wavail = wcount - wpos;
+	if (wavail <= 0)
+	  {
+	    // Nothing waiting, so refill their buffer.
+	    return refill(buf, offset, length);
+	  }
+
+	if (length > wavail)
+	  length = wavail;
+	System.arraycopy(work, wpos, buf, offset, length);
+	wpos += length;
+	return length;
+      }
+  }
+
+  /**
+   * This method reads a single character of data from the stream.
+   *
+   * @return The char read, as an int, or -1 if end of stream.
+   *
+   * @exception IOException If an error occurs
+   */
+  public int read() throws IOException
+  {
+    synchronized (lock)
+      {
+	if (in == null)
+	  throw new IOException("Stream closed");
+
+	int wavail = wcount - wpos;
+	if (wavail <= 0)
+	  {
+	    // Nothing waiting, so refill our internal buffer.
+	    wpos = wcount = 0;
+	    if (work == null)
+	       work = new char[100];
+	    int count = refill(work, 0, work.length);
+	    if (count == -1)
+	      return -1;
+	    wcount += count;
+	  }
+
+	return work[wpos++];
+      }
+  }
+
+  // Read more bytes and convert them into the specified buffer.
+  // Returns the number of converted characters or -1 on EOF.
+  private int refill(char[] buf, int offset, int length) throws IOException
+  {
+    for (;;)
+      {
+	// We have knowledge of the internals of BufferedInputStream
+	// here.  Eww.
+	// BufferedInputStream.refill() can only be called when
+	// `pos>=count'.
+	boolean r = in.pos < in.count || in.refill ();
+	if (! r)
+	  return -1;
+	converter.setInput(in.buf, in.pos, in.count);
+	int count = converter.read(buf, offset, length);
+
+	// We might have bytes but not have made any progress.  In
+	// this case we try to refill.  If refilling fails, we assume
+	// we have a malformed character at the end of the stream.
+	if (count == 0 && converter.inpos == in.pos)
+	  {
+	    in.mark(in.count);
+	    if (! in.refill ())
+	      throw new CharConversionException ();
+	    in.reset();
+	  }
+	else
+	  {
+	    in.skip(converter.inpos - in.pos);
+	    if (count > 0)
+	      return count;
+	  }
+      }
+  }
+}