/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2019 Rexx Language Association. All rights reserved.    */
/*                                                                            */
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/* the terms of the Common Public License v1.0 which accompanies this         */
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/*                                                                            */
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/* derived from this software without specific prior written permission.      */
/*                                                                            */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/*                                                                            */
/* Primitive Buffer Class                                                     */
/*                                                                            */
/******************************************************************************/

#include <algorithm>
#include "RexxCore.h"
#include "Activity.hpp"
#include "ActivityManager.hpp"
#include "BufferClass.hpp"


RexxClass *BufferClass::classInstance = OREF_NULL;   // singleton class instance


/**
 * Initial bootstrap of the buffer class object.
 */
void BufferClass::createInstance()
{
    CLASS_CREATE(Buffer);
}


/**
 * Allocate a new buffer object.
 *
 * @param size    The size of the object.
 * @param _length The length of the buffer portion required.
 *
 * @return The new buffer object.
 */
void *BufferClass::operator new(size_t size, size_t length)
{
    return new_object(size + length, T_Buffer);
}


/**
 * New method for the buffer class.  This always raises
 * an error if called.
 *
 * @param args   The new arguments.
 * @param argc   The argument count.
 *
 * @return Always raises an error.
 */
RexxObject *BufferClass::newRexx(RexxObject **args, size_t argc)
{
    // we do not allow these to be allocated from Rexx code...
    reportException(Error_Unsupported_new_method, ((RexxClass *)this)->getId());
    return TheNilObject;
}


/**
 * Create a larger buffer and copy existing data into it
 *
 * @param l      The new buffer size.
 *
 * @return A new buffer object of the expanded size.  All existing
 *         data from the target buffer is copied into the new buffer.
 */
BufferClass *BufferClass::expand(size_t l)
{
    // we will either return a buffer twice the size of the current
    // buffer, or this size of current(this)buffer + requested
    // minimum length.

    l = std::max(l, getBufferSize());

    BufferClass *newBuffer = new_buffer(getBufferSize() + l);
    // have new buffer, so copy data from current buffer into new buffer.
    newBuffer->copyData(0, getData(), getDataLength());
    return newBuffer;
}