X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=libjava%2Fjava%2Fio%2FByteArrayInputStream.java;fp=libjava%2Fjava%2Fio%2FByteArrayInputStream.java;h=0000000000000000000000000000000000000000;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=6a5f2c61897480af7ec406f86bd94940ab6af0fb;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/libjava/java/io/ByteArrayInputStream.java b/libjava/java/io/ByteArrayInputStream.java deleted file mode 100644 index 6a5f2c61..00000000 --- a/libjava/java/io/ByteArrayInputStream.java +++ /dev/null @@ -1,251 +0,0 @@ -/* ByteArrayInputStream.java -- Read an array as a stream - Copyright (C) 1998, 1999, 2001 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., 59 Temple Place, Suite 330, Boston, MA -02111-1307 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 bytes to be read as an input stream. - * - * @author Warren Levy - * @author Aaron M. Renn (arenn@urbanophile.com) - */ -public class ByteArrayInputStream extends InputStream -{ - /** - * The array that contains the data supplied during read operations - */ - protected byte[] buf; - - /** - * The array index of the next byte 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 mark; - - /** - * This indicates the maximum number of bytes that can be read from this - * stream. It is the array index of the position after the last valid - * byte in the buffer buf - */ - protected int count; - - /** - * Create a new ByteArrayInputStream that will read bytes from the passed - * in byte array. This stream will read from the beginning to the end - * of the array. It is identical to calling an overloaded constructor - * as ByteArrayInputStream(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 - * bytes supplied to the reader. Please use caution in changing the - * contents of the buffer while this stream is open. - * - * @param buf The byte array buffer this stream will read from. - */ - public ByteArrayInputStream(byte[] buffer) - { - this(buffer, 0, buffer.length); - } - - /** - * Create a new ByteArrayInputStream that will read bytes from the - * passed in byte array. This stream will read from position - * offset in the array for a length of - * length bytes past offset. If the - * stream is reset to a position before offset then - * more than length bytes 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 - * bytes supplied to the reader. Please use caution in changing the - * contents of the buffer while this stream is open. - * - * @param buf The byte array buffer this stream will read from. - * @param offset The index into the buffer to start reading bytes from - * @param length The number of bytes to read from the buffer - */ - public ByteArrayInputStream(byte[] buffer, int offset, int length) - { - 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; - mark = pos; - } - - /** - * This method returns the number of bytes available to be read from this - * stream. The value returned will be equal to count - pos. - * - * @return The number of bytes that can be read from this stream - * before blocking, which is all of them - */ - public synchronized int available() - { - return count - pos; - } - - /** - * 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 bytes 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 readlimit The number of bytes this stream must remember. - * This parameter is ignored. - */ - public synchronized void mark(int readAheadLimit) - { - // readAheadLimit is ignored per Java Class Lib. book, p.220. - mark = pos; - } - - /** - * This method overrides the markSupported method in - * InputStream 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 byte from the stream. The pos - * 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 synchronized int read() - { - if (pos < count) - return ((int) buf[pos++]) & 0xFF; - return -1; - } - - /** - * This method reads bytes 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 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. - *

- * This method does not block. - * - * @param buf The array into which the bytes read should be stored. - * @param offset 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 synchronized int read(byte[] b, int off, int len) - { - if (pos >= count) - return -1; - - int numBytes = Math.min(count - pos, len); - System.arraycopy(buf, pos, b, off, numBytes); - pos += numBytes; - return numBytes; - } - - /** - * 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 synchronized void reset() - { - pos = mark; - } - - /** - * This method attempts to skip the requested number of bytes in the - * input stream. It does this by advancing the pos - * 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 num_bytes The requested number of bytes to skip - * - * @return The actual number of bytes skipped. - */ - public synchronized long skip(long n) - { - // Even though the var numBytes 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, numBytes might as well just be a long. - long numBytes = Math.min((long) (count - pos), n < 0 ? 0L : n); - pos += numBytes; - return numBytes; - } -}