From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/java/io/CharArrayReader.java | 305 +++++++++++++++++++++++++ 1 file changed, 305 insertions(+) create mode 100644 libjava/classpath/java/io/CharArrayReader.java (limited to 'libjava/classpath/java/io/CharArrayReader.java') diff --git a/libjava/classpath/java/io/CharArrayReader.java b/libjava/classpath/java/io/CharArrayReader.java new file mode 100644 index 000000000..8405f48f3 --- /dev/null +++ b/libjava/classpath/java/io/CharArrayReader.java @@ -0,0 +1,305 @@ +/* CharArrayReader.java -- Read an array of characters as a stream + Copyright (C) 1998, 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; + +/** + * This class permits an array of chars to be read as an input stream. + * + * @author Aaron M. Renn (arenn@urbanophile.com) + * @author Warren Levy (warrenl@cygnus.com) + */ +public class CharArrayReader extends Reader +{ + /** + * The array that contains the data supplied during read operations + */ + protected char[] buf; + + /** + * The array index of the next char to be read from the buffer + * buf + */ + protected int pos; + + /** + * The currently marked position in the stream. This defaults to 0, so a + * reset operation on the stream resets it to read from array index 0 in + * the buffer - even if the stream was initially created with an offset + * greater than 0 + */ + protected int markedPos; + + /** + * This indicates the maximum number of chars that can be read from this + * stream. It is the array index of the position after the last valid + * char in the buffer buf + */ + protected int count; + + /** + * Create a new CharArrayReader that will read chars from the passed + * in char array. This stream will read from the beginning to the end + * of the array. It is identical to calling an overloaded constructor + * as CharArrayReader(buf, 0, buf.length). + *

+ * Note that this array is not copied. If its contents are changed + * while this stream is being read, those changes will be reflected in the + * chars supplied to the reader. Please use caution in changing the + * contents of the buffer while this stream is open. + * + * @param buffer The char array buffer this stream will read from. + */ + public CharArrayReader(char[] buffer) + { + this(buffer, 0, buffer.length); + } + + /** + * Create a new CharArrayReader that will read chars from the passed + * in char array. This stream will read from position + * offset in the array for a length of + * length chars past offset. If the + * stream is reset to a position before offset then + * more than length chars can be read from the stream. + * The length value should be viewed as the array index + * one greater than the last position in the buffer to read. + *

+ * Note that this array is not copied. If its contents are changed + * while this stream is being read, those changes will be reflected in the + * chars supplied to the reader. Please use caution in changing the + * contents of the buffer while this stream is open. + * + * @param buffer The char array buffer this stream will read from. + * @param offset The index into the buffer to start reading chars from + * @param length The number of chars to read from the buffer + */ + public CharArrayReader(char[] buffer, int offset, int length) + { + super(); + if (offset < 0 || length < 0 || offset > buffer.length) + throw new IllegalArgumentException(); + + buf = buffer; + + count = offset + length; + if (count > buf.length) + count = buf.length; + + pos = offset; + markedPos = pos; + } + + /** + * This method closes the stream. + */ + public void close() + { + synchronized (lock) + { + buf = null; + } + } + + /** + * This method sets the mark position in this stream to the current + * position. Note that the readlimit parameter in this + * method does nothing as this stream is always capable of + * remembering all the chars int it. + *

+ * Note that in this class the mark position is set by default to + * position 0 in the stream. This is in constrast to some other + * stream types where there is no default mark position. + * + * @param readAheadLimit The number of chars this stream must + * remember. This parameter is ignored. + * + * @exception IOException If an error occurs + */ + public void mark(int readAheadLimit) throws IOException + { + synchronized (lock) + { + if (buf == null) + throw new IOException("Stream closed"); + // readAheadLimit is ignored per Java Class Lib. book, p. 318. + markedPos = pos; + } + } + + /** + * This method overrides the markSupported method in + * Reader in order to return true - + * indicating that this stream class supports mark/reset + * functionality. + * + * @return true to indicate that this class supports + * mark/reset. + */ + public boolean markSupported() + { + return true; + } + + /** + * This method reads one char from the stream. The pos + * counter is advanced to the next char to be read. The char read + * is returned as an int in the range of 0-65535. If the stream + * position is already at the end of the buffer, no char is read and + * a -1 is returned in order to indicate the end of the stream. + * + * @return The char read, or -1 if end of stream + */ + public int read() throws IOException + { + synchronized (lock) + { + if (buf == null) + throw new IOException("Stream closed"); + + if (pos < 0) + throw new ArrayIndexOutOfBoundsException(pos); + + if (pos < count) + return ((int) buf[pos++]) & 0xFFFF; + return -1; + } + } + + /** + * This method reads chars from the stream and stores them into a + * caller supplied buffer. It starts storing the data at index + * offset into the buffer and attempts to read + * len chars. This method can return before reading + * the number of chars requested if the end of the stream is + * encountered first. The actual number of chars read is returned. + * If no chars can be read because the stream is already at the end + * of stream position, a -1 is returned. + *

+ * This method does not block. + * + * @param b The array into which the chars read should be stored. + * @param off The offset into the array to start storing chars + * @param len The requested number of chars to read + * + * @return The actual number of chars read, or -1 if end of stream. + */ + public int read(char[] b, int off, int len) throws IOException + { + synchronized (lock) + { + if (buf == null) + throw new IOException("Stream closed"); + + /* Don't need to check pos value, arraycopy will check it. */ + if (off < 0 || len < 0 || off + len > b.length) + throw new IndexOutOfBoundsException(); + + if (pos >= count) + return -1; + + int numChars = Math.min(count - pos, len); + System.arraycopy(buf, pos, b, off, numChars); + pos += numChars; + return numChars; + } + } + + /** + * Return true if more characters are available to be read. + * + * @return true to indicate that this stream is ready + * to be read. + * + * @specnote The JDK 1.3 API docs are wrong here. This method will + * return false if there are no more characters available. + */ + public boolean ready() throws IOException + { + if (buf == null) + throw new IOException("Stream closed"); + + return (pos < count); + } + + /** + * This method sets the read position in the stream to the mark + * point by setting the pos variable equal to the + * mark variable. Since a mark can be set anywhere in + * the array, the mark/reset methods int this class can be used to + * provide random search capabilities for this type of stream. + */ + public void reset() throws IOException + { + synchronized (lock) + { + if (buf == null) + throw new IOException("Stream closed"); + + pos = markedPos; + } + } + + /** + * This method attempts to skip the requested number of chars in the + * input stream. It does this by advancing the pos value by the + * specified number of chars. It this would exceed the length of the + * buffer, then only enough chars are skipped to position the stream at + * the end of the buffer. The actual number of chars skipped is returned. + * + * @param n The requested number of chars to skip + * + * @return The actual number of chars skipped. + */ + public long skip(long n) throws IOException + { + synchronized (lock) + { + if (buf == null) + throw new IOException("Stream closed"); + + // Even though the var numChars is a long, in reality it can never + // be larger than an int since the result of subtracting 2 positive + // ints will always fit in an int. Since we have to return a long + // anyway, numChars might as well just be a long. + long numChars = Math.min((long) (count - pos), n < 0 ? 0L : n); + pos += numChars; + return numChars; + } + } +} -- cgit v1.2.3