src/util/BinMemInputStream.hpp

/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999 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,
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 * ====================================================================
 * 
 * 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.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
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/**
 * $Log$
 * Revision 1.1  1999/11/09 01:04:07  twl
 * Initial revision
 *
 * Revision 1.3  1999/11/08 20:45:04  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */

#if !defined(BINMEMINPUTSTREAM_HPP)
#define BINMEMINPUTSTREAM_HPP

#include <util/BinInputStream.hpp>


class XMLUTIL_EXPORT BinMemInputStream : public BinInputStream
{
public :
    // -----------------------------------------------------------------------
    //  Class specific types
    // -----------------------------------------------------------------------
    enum BufOpts
    {
        BufOpt_Adopt
        , BufOpt_Copy
        , BufOpt_Reference
    };


    // -----------------------------------------------------------------------
    //  Constructors and Destructor
    // -----------------------------------------------------------------------
    BinMemInputStream
    (
        const   XMLByte* const  initData
        , const unsigned int    capacity
        , const BufOpts         bufOpt = BufOpt_Copy
    );
    virtual ~BinMemInputStream();


    // -----------------------------------------------------------------------
    //  Stream management methods
    // -----------------------------------------------------------------------
    void reset();


    // -----------------------------------------------------------------------
    //  Implementation of the input stream interface
    // -----------------------------------------------------------------------
    virtual unsigned int curPos() const;
    virtual unsigned int readBytes
    (
                XMLByte* const  toFill
        , const unsigned int    maxToRead
    );


private :
    // -----------------------------------------------------------------------
    //  Private data members
    //
    //  fBuffer
    //      The buffer of bytes that we are streaming.
    //
    //  fBufOpt
    //      Indicates the ownership status of the buffer. The caller can have
    //      us adopt it (we delete it), reference it, or just make our own
    //      copy of it.
    //
    //  fCapacity
    //      The size of the buffer being streamed.
    //
    //  fCurIndex
    //      The current index where the next byte will be read from. When it
    //      hits fCapacity, we are done.
    // -----------------------------------------------------------------------
    const XMLByte*  fBuffer;
    BufOpts         fBufOpt;
    unsigned int    fCapacity;
    unsigned int    fCurIndex;
};


// ---------------------------------------------------------------------------
//  BinMemInputStream: Stream management methods
// ---------------------------------------------------------------------------
inline void BinMemInputStream::reset()
{
    fCurIndex = 0;
}


// ---------------------------------------------------------------------------
//  BinMemInputStream: Implementation of the input stream interface
// ---------------------------------------------------------------------------
inline unsigned int BinMemInputStream::curPos() const
{
    return fCurIndex;
}

#endif