BufferClass.hpp

Go to the documentation of this file.

/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
/*                                                                            */
/* This program and the accompanying materials are made available under       */
/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
/* http://www.oorexx.org/license.html                          */
/*                                                                            */
/* Redistribution and use in source and binary forms, with or                 */
/* without modification, are permitted provided that the following            */
/* conditions are met:                                                        */
/*                                                                            */
/* Redistributions of source code must retain the above copyright             */
/* notice, this list of conditions and the following disclaimer.              */
/* 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.   */
/*                                                                            */
/* Neither the name of Rexx Language Association nor the names                */
/* of its contributors may be used to endorse or promote products             */
/* derived from this software without specific prior written permission.      */
/*                                                                            */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS        */
/* "AS IS" AND ANY EXPRESS 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 COPYRIGHT   */
/* OWNER OR 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.               */
/*                                                                            */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Kernel                                               BufferClass.hpp  */
/*                                                                            */
/* Primitive Buffer Class Definitions                                         */
/*                                                                            */
/******************************************************************************/
#ifndef Included_RexxBuffer
#define Included_RexxBuffer
 
class RexxBufferBase : public RexxObject
{
public:
 
    inline RexxBufferBase() {;};
 
    inline sizeB_t getDataLength() { return this->dataLength; }
    inline sizeB_t getBufferSize() { return this->bufferSize; }
    inline void   setDataLength(sizeB_t l) { this->dataLength = l; }
    virtual char *getData() = 0;
    inline void copyData(sizeB_t offset, const char *string, sizeB_t l) { memcpy(this->getData() + offset, string, l); }
    inline void copyData(CONSTRXSTRING &r) { copyData(0, r.strptr, r.strlength); }
    inline void copyData(RXSTRING &r) { copyData(0, r.strptr, r.strlength); }
    inline void openGap(sizeB_t offset, sizeB_t _size, sizeB_t tailSize)
    {
        memmove(getData() + offset + _size, getData() + offset, tailSize);
    }
    inline void closeGap(sizeB_t offset, sizeB_t _size, sizeB_t tailSize)
    {
        memmove(getData() + offset, getData() + offset + _size, tailSize);
    }
 
    inline void adjustGap(sizeB_t offset, sizeB_t _size, sizeB_t _newSize)
    {
        // We have _size bytes to replace by _newSize bytes
        // 0 1 2 3 4 5 6 7 8 9      offset = 3, XX to be replaced by YYY
        // a b c X X f g            _size = 2
        // a b c Y Y Y f g          _newSize = 3
        sizeB_t offset_from = offset + _size; // offset of the 1st byte to move
        if (offset_from < getDataLength())
        {
            sizeB_t offset_to = offset + _newSize; // destination offset of the 1st byte to move
            sizeB_t tailSize = getDataLength() - offset_from;
            memmove(getData() + offset_to, getData() + offset_from, tailSize);
        }
    }
    inline void setData(sizeB_t offset, char character, sizeB_t l)
    {
        memset(getData() + offset, character, l);
    }
protected:
 
    // the following field is padding required to get the start of the of the
    // buffer data aligned on an object grain boundary.  Since we unflatten saved programs
    // by reducing the size of the surrounding buffer to reveal the exposed data, we need
    // to ensure appropriate data alignment.  Fortunately, because the sizes of all of the
    // fields doubles when going to 64-bit, this single padding item is sufficient to
    // get everything lined up on all platforms.
    sizeB_t reserved;
    sizeB_t bufferSize;                  // size of the buffer
    sizeB_t dataLength;                  // length of the buffer data (freqently the same)
};
 
 
class RexxBuffer : public RexxBufferBase
{
public:
    void *operator new(size_t, size_t);
    inline void *operator new(size_t size, void *ptr) {return ptr;};
    inline void  operator delete(void *) { ; }
    inline void  operator delete(void *, size_t) { ; }
    inline void  operator delete(void *, void *) { ; }
 
    inline RexxBuffer() {;}
    inline RexxBuffer(RESTORETYPE restoreType) { ; }
 
    RexxBuffer *expand(sizeB_t);
    RexxObject *newRexx(RexxObject **args, size_t argc, size_t named_argc);
    virtual char *getData() { return data; }
 
    static void createInstance();
 
    static RexxClass *classInstance;   // singleton class instance
 
protected:
    char data[4];                       /* actual data length                */
};
 
 
 inline RexxBuffer *new_buffer(sizeB_t s) { return new (size_v(s)) RexxBuffer; }
 inline RexxBuffer *new_buffer(CONSTRXSTRING &r)
 {
     RexxBuffer *b = new_buffer(r.strlength);
     b->copyData(r);
     return b;
 }
 
 inline RexxBuffer *new_buffer(RXSTRING &r)
 {
     RexxBuffer *b = new_buffer(r.strlength);
     b->copyData(r);
     return b;
 }
 
 inline RexxBuffer *new_buffer(const char *data, sizeB_t length)
 {
     RexxBuffer *b = new_buffer(length);
     b->copyData(0, data, length);
     return b;
 }
#endif