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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /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;
+ }
+}