content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE 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 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE 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 AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2000-2002,2004 The Apache Software Foundation.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package jaxp.sun.org.apache.xerces.internal.impl.io;
  
  import java.io.InputStream;
  import java.io.IOException;
  import java.io.Reader;
  import java.util.Locale;
  import jaxp.sun.org.apache.xerces.internal.util.MessageFormatter;
  import jaxp.sun.org.apache.xerces.internal.impl.msg.XMLMessageFormatter;
  
  import jaxp.sun.xml.internal.stream.util.BufferAllocator;
  import jaxp.sun.xml.internal.stream.util.ThreadLocalBufferAllocator;
  
  /**
   * A simple ASCII byte reader. This is an optimized reader for reading
   * byte streams that only contain 7-bit ASCII characters.
   *
   * @xerces.internal
   *
   * @author Andy Clark, IBM
   *
   */
  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;
          BufferAllocator ba = ThreadLocalBufferAllocator.getBufferAllocator();
          fBuffer = ba.getByteBuffer(size);
          if (fBuffer == null) {
              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 {
           BufferAllocator ba = ThreadLocalBufferAllocator.getBufferAllocator();
           ba.returnByteBuffer(fBuffer);
           fBuffer = null;
           fInputStream.close();
       } // close()
  
  } // class ASCIIReader
  