- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 2000-2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.apache.org. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- package com.sun.org.apache.xerces.internal.impl.io;
-
- import java.io.InputStream;
- import java.io.IOException;
- import java.io.Reader;
- import java.util.Locale;
- import com.sun.org.apache.xerces.internal.util.MessageFormatter;
- import com.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;
-
- /**
- * A simple ASCII byte reader. This is an optimized reader for reading
- * byte streams that only contain 7-bit ASCII characters.
- *
- * @author Andy Clark, IBM
- *
- * @version $Id: ASCIIReader.java,v 1.7 2004/03/04 19:27:13 mrglavas Exp $
- */
- public class ASCIIReader
- extends Reader {
-
- //
- // Constants
- //
-
- /** Default byte buffer size (2048). */
- public static final int DEFAULT_BUFFER_SIZE = 2048;
-
- //
- // Data
- //
-
- /** Input stream. */
- protected InputStream fInputStream;
-
- /** Byte buffer. */
- protected byte[] fBuffer;
-
- // message formatter; used to produce localized
- // exception messages
- private MessageFormatter fFormatter = null;
-
- //Locale to use for messages
- private Locale fLocale = null;
-
- //
- // Constructors
- //
-
- /**
- * Constructs an ASCII reader from the specified input stream
- * using the default buffer size.
- *
- * @param inputStream The input stream.
- * @param messageFormatter the MessageFormatter to use to message reporting.
- * @param locale the Locale for which messages are to be reported
- */
- public ASCIIReader(InputStream inputStream, MessageFormatter messageFormatter,
- Locale locale) {
- this(inputStream, DEFAULT_BUFFER_SIZE, messageFormatter, locale);
- } // <init>(InputStream, MessageFormatter, Locale)
-
- /**
- * Constructs an ASCII reader from the specified input stream
- * and buffer size.
- *
- * @param inputStream The input stream.
- * @param size The initial buffer size.
- * @param messageFormatter the MessageFormatter to use to message reporting.
- * @param locale the Locale for which messages are to be reported
- */
- public ASCIIReader(InputStream inputStream, int size,
- MessageFormatter messageFormatter, Locale locale) {
- fInputStream = inputStream;
- fBuffer = new byte[size];
- fFormatter = messageFormatter;
- fLocale = locale;
- } // <init>(InputStream,int, MessageFormatter, Locale)
-
- //
- // Reader methods
- //
-
- /**
- * Read a single character. This method will block until a character is
- * available, an I/O error occurs, or the end of the stream is reached.
- *
- * <p> Subclasses that intend to support efficient single-character input
- * should override this method.
- *
- * @return The character read, as an integer in the range 0 to 127
- * (<tt>0x00-0x7f</tt>), or -1 if the end of the stream has
- * been reached
- *
- * @exception IOException If an I/O error occurs
- */
- public int read() throws IOException {
- int b0 = fInputStream.read();
- if (b0 >= 0x80) {
- throw new MalformedByteSequenceException(fFormatter,
- fLocale, XMLMessageFormatter.XML_DOMAIN,
- "InvalidASCII", new Object [] {Integer.toString(b0)});
- }
- return b0;
- } // read():int
-
- /**
- * Read characters into a portion of an array. This method will block
- * until some input is available, an I/O error occurs, or the end of the
- * stream is reached.
- *
- * @param ch Destination buffer
- * @param offset Offset at which to start storing characters
- * @param length Maximum number of characters to read
- *
- * @return The number of characters read, or -1 if the end of the
- * stream has been reached
- *
- * @exception IOException If an I/O error occurs
- */
- public int read(char ch[], int offset, int length) throws IOException {
- if (length > fBuffer.length) {
- length = fBuffer.length;
- }
- int count = fInputStream.read(fBuffer, 0, length);
- for (int i = 0; i < count; i++) {
- int b0 = fBuffer[i];
- if (b0 < 0) {
- throw new MalformedByteSequenceException(fFormatter,
- fLocale, XMLMessageFormatter.XML_DOMAIN,
- "InvalidASCII", new Object [] {Integer.toString(b0 & 0x0FF)});
- }
- ch[offset + i] = (char)b0;
- }
- return count;
- } // read(char[],int,int)
-
- /**
- * Skip characters. This method will block until some characters are
- * available, an I/O error occurs, or the end of the stream is reached.
- *
- * @param n The number of characters to skip
- *
- * @return The number of characters actually skipped
- *
- * @exception IOException If an I/O error occurs
- */
- public long skip(long n) throws IOException {
- return fInputStream.skip(n);
- } // skip(long):long
-
- /**
- * Tell whether this stream is ready to be read.
- *
- * @return True if the next read() is guaranteed not to block for input,
- * false otherwise. Note that returning false does not guarantee that the
- * next read will block.
- *
- * @exception IOException If an I/O error occurs
- */
- public boolean ready() throws IOException {
- return false;
- } // ready()
-
- /**
- * Tell whether this stream supports the mark() operation.
- */
- public boolean markSupported() {
- return fInputStream.markSupported();
- } // markSupported()
-
- /**
- * Mark the present position in the stream. Subsequent calls to reset()
- * will attempt to reposition the stream to this point. Not all
- * character-input streams support the mark() operation.
- *
- * @param readAheadLimit Limit on the number of characters that may be
- * read while still preserving the mark. After
- * reading this many characters, attempting to
- * reset the stream may fail.
- *
- * @exception IOException If the stream does not support mark(),
- * or if some other I/O error occurs
- */
- public void mark(int readAheadLimit) throws IOException {
- fInputStream.mark(readAheadLimit);
- } // mark(int)
-
- /**
- * Reset the stream. If the stream has been marked, then attempt to
- * reposition it at the mark. If the stream has not been marked, then
- * attempt to reset it in some way appropriate to the particular stream,
- * for example by repositioning it to its starting point. Not all
- * character-input streams support the reset() operation, and some support
- * reset() without supporting mark().
- *
- * @exception IOException If the stream has not been marked,
- * or if the mark has been invalidated,
- * or if the stream does not support reset(),
- * or if some other I/O error occurs
- */
- public void reset() throws IOException {
- fInputStream.reset();
- } // reset()
-
- /**
- * Close the stream. Once a stream has been closed, further read(),
- * ready(), mark(), or reset() invocations will throw an IOException.
- * Closing a previously-closed stream, however, has no effect.
- *
- * @exception IOException If an I/O error occurs
- */
- public void close() throws IOException {
- fInputStream.close();
- } // close()
-
- } // class ASCIIReader