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From-SVN: r102074

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diff --git a/libjava/classpath/java/io/StringBufferInputStream.java b/libjava/classpath/java/io/StringBufferInputStream.java
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+/* StringBufferInputStream.java -- Read an String as a stream
+   Copyright (C) 1998, 1999, 2001, 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;
+
+/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
+ * "The Java Language Specification", ISBN 0-201-63451-1
+ * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
+ * Status:  Believed complete and correct.  Deprecated in JDK 1.1.
+ */
+ 
+/**
+  * This class permits a <code>String</code> to be read as an input stream.
+  * The low eight bits of each character in the <code>String</code> are the
+  * bytes that are returned. The high eight bits of each character are
+  * discarded.
+  * <p>
+  * The mark/reset functionality in this class behaves differently than
+  * normal.  The <code>mark()</code> method is always ignored and the 
+  * <code>reset()</code> method always resets in stream to start reading from 
+  * position 0 in the String.  Note that since this method does not override 
+  * <code>markSupported()</code> in <code>InputStream</code>, calling that 
+  * method will return <code>false</code>.
+  * <p>
+  * Note that this class is deprecated because it does not properly handle
+  * 16-bit Java characters.  It is provided for backwards compatibility only
+  * and should not be used for new development.  The <code>StringReader</code>
+  * class should be used instead.
+  *
+  * @deprecated
+  *
+  * @author Aaron M. Renn (arenn@urbanophile.com)
+  * @author Warren Levy (warrenl@cygnus.com)
+  */
+public class StringBufferInputStream extends InputStream
+{
+  /** The String which is the input to this stream. */
+  protected String buffer;
+
+  /** Position of the next byte in buffer to be read. */
+  protected int pos = 0;
+
+  /** The length of the String buffer. */
+  protected int count;
+
+ /**
+  * Create a new <code>StringBufferInputStream</code> that will read bytes
+  * from the passed in <code>String</code>.  This stream will read from the
+  * beginning to the end of the <code>String</code>.
+  *
+  * @param s The <code>String</code> this stream will read from.
+  */
+  public StringBufferInputStream(String s)
+  {
+    buffer = s;
+    count = s.length();
+  }
+
+ /**
+  * This method returns the number of bytes available to be read from this
+  * stream.  The value returned will be equal to <code>count - pos</code>.
+  *
+  * @return The number of bytes that can be read from this stream before
+  * blocking, which is all of them
+  */
+  public int available()
+  {
+    return count - pos;
+  }
+
+ /**
+  * This method reads one byte from the stream.  The <code>pos</code> counter 
+  * is advanced to the next byte to be read.  The byte read is returned as
+  * an int in the range of 0-255.  If the stream position is already at the
+  * end of the buffer, no byte is read and a -1 is returned in order to
+  * indicate the end of the stream.
+  *
+  * @return The byte read, or -1 if end of stream
+  */
+  public int read()
+  {
+    if (pos >= count)
+      return -1;	// EOF
+
+    return ((int) buffer.charAt(pos++)) & 0xFF;
+  }
+
+/**
+  * This method reads bytes from the stream and stores them into a caller
+  * supplied buffer.  It starts storing the data at index <code>offset</code> 
+  * into the buffer and attempts to read <code>len</code> bytes.  This method
+  * can return before reading the number of bytes requested if the end of the
+  * stream is encountered first.  The actual number of bytes read is 
+  * returned.  If no bytes can be read because the stream is already at 
+  * the end of stream position, a -1 is returned.
+  * <p>
+  * This method does not block.
+  *
+  * @param b The array into which the bytes read should be stored.
+  * @param off The offset into the array to start storing bytes
+  * @param len The requested number of bytes to read
+  *
+  * @return The actual number of bytes read, or -1 if end of stream.
+  */
+  public int read(byte[] b, int off, int len)
+  {
+    if (off < 0 || len < 0 || off + len > b.length)
+      throw new ArrayIndexOutOfBoundsException();
+
+    if (pos >= count)
+      return -1;	// EOF
+
+    int numRead = Math.min(len, count - pos);
+    if (numRead < 0)
+      return 0;
+
+    buffer.getBytes(pos, pos + numRead, b, off);
+    pos += numRead;
+    return numRead;
+  }
+
+ /**
+  * This method sets the read position in the stream to the beginning
+  * setting the <code>pos</code> variable equal to 0.  Note that this differs
+  * from the common implementation of the <code>reset()</code> method.
+  */
+  public void reset()
+  {
+    pos = 0;
+  }
+
+ /**
+  * This method attempts to skip the requested number of bytes in the
+  * input stream.  It does this by advancing the <code>pos</code> value by the
+  * specified number of bytes.  It this would exceed the length of the
+  * buffer, then only enough bytes are skipped to position the stream at
+  * the end of the buffer.  The actual number of bytes skipped is returned.
+  *
+  * @param n The requested number of bytes to skip
+  *
+  * @return The actual number of bytes skipped.
+  */
+  public long skip(long n)
+  {
+    if (n < 0)
+      return 0L;
+
+    long actualSkip = Math.min(n, count - pos);
+    pos += actualSkip;
+    return actualSkip;
+  }
+}