gcc/libjava/java/io/StringBufferInputStream.java

/* Copyright (C) 1998, 1999  Cygnus Solutions

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */
 
package java.io;

/**
 * @author Warren Levy <warrenl@cygnus.com>
 * @date November 11, 1998.
 * @deprecated 
 */
/* 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.
 */
 
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;

  public StringBufferInputStream(String s)
  {
    buffer = s;
    count = s.length();
  }

  public int available()
  {
    return count - pos;
  }

  public int read()
  {
    if (pos >= count)
      return -1;	// EOF

    return ((int) buffer.charAt(pos++)) & 0xFF;
  }

  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;
  }

  public void reset()
  {
    pos = 0;
  }

  public long skip(long n)
  {
    if (n < 0)
      return 0L;

    long actualSkip = Math.min(n, count - pos);
    pos += actualSkip;
    return actualSkip;
  }
}