/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2005-2018 Rexx Language Association. All rights reserved.    */
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/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
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/* the documentation and/or other materials provided with the distribution.   */
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/* of its contributors may be used to endorse or promote products             */
/* derived from this software without specific prior written permission.      */
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/*----------------------------------------------------------------------------*/

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "ServiceException.hpp"
#include "CSStream.hpp"


/**
 * Get a buffer for sending a buffered message.
 *
 * @param size   The required size.
 *
 * @return A pointer to a buffer, or NULL if unable to allocate.
 */
char *ApiConnection::getMessageBuffer(size_t size)
{
    // if larger than our cached buffer, return
    if (size > MAX_CACHED_BUFFER)
    {
        char *buffer = (char *)malloc(size);
        if (buffer == NULL)
        {
            throw new ServiceException(MEMORY_ERROR, "Error allocating message buffer");
        }
        return buffer;
    }
    // use our cached buffer, allocating it if required.
    if (messageBuffer == NULL)
    {
        messageBuffer = (char *)malloc(MAX_CACHED_BUFFER);
        if (messageBuffer == NULL)
        {
            throw new ServiceException(MEMORY_ERROR, "Error allocating message buffer");
        }
    }
    return messageBuffer;
}


/**
 * Return a message buffer after sending a message.  This will
 * either cache the buffer, or release it, depending upon
 * how it was obtained in the first place.
 *
 * @param buffer The buffer to release.
 */
void ApiConnection::returnMessageBuffer(void *buffer)
{
    if (buffer != messageBuffer)
    {
        free(buffer);
    }
}