ospcallid.c

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/*
*########################################################################
*########################################################################
*########################################################################
*                                                               
*   COPYRIGHT (c) 1998, 1999 by TransNexus, LLC                          
*                                                                    
*   This software contains proprietary and confidential information  
*   of TransNexus, LLC. Except as may be set forth in the license    
*   agreement under which this software is supplied, use, disclosure, 
*   or reproduction is prohibited without the prior, express, written
*   consent of TransNexus, LLC.                                      
*                                     
*
*
*
*
*
*
*#########################################################################
*#########################################################################
*#########################################################################
*/

/*
 * ospcallid.c - OSP call identifier functions
 */

#include "osp.h"
#include "osperrno.h"
#include "osplist.h"
#include "ospxmldoc.h"
#include "ospxmlattr.h"
#include "ospxmlelem.h"
#include "ospmsgattr.h"
#include "ospmsgelem.h"
#include "ospmsg.h"


/**/
/*-----------------------------------------------------------------------*
 * OSPPCallIdNew() - create a new call identifier object
 *-----------------------------------------------------------------------*/

OSPTCALLID *                           /* returns ptr to call ID or null */
    OSPPCallIdNew(
    unsigned             ospvLen,      /* size of call ID */
    const unsigned char *ospvValue     /* call ID value */
    )
{
    OSPTCALLID    *ospvCallId = OSPC_OSNULL;
    unsigned char *valptr;

    if (ospvLen   >  0)
    {
        if (ospvValue != OSPC_OSNULL)
        {

            /*
             * CallId objects are actually two parts -- the first is the CallId
             * structure and the second is the call Id value. The two parts are
             * contiguous in memory, and are created (and destroyed) at the same
             * time. Here's a rough picture:
             *
             *    Memory:
             *      +--------+
             *      |        |  This part is the structure itself. It's actually
             *      |        |  visible to the functions (and macros).
             *      +--------+
             *      |        |
             *      |        |  This part contains the actual value. It's not directly
             *      |        |  accessible, but pointers to the value within
             *      |        |  the structure are set to point to it.
             *      +--------+
             *
             * We do it this way to conveniently manage variable size call IDs
             * If we put the value in a visible part of the structure,
             * then we'd have to define that field, and that would require
             * defining a size for it. Since we can't predict the size of
             * callId values , picking the size for the structure would be pretty
             * difficult.
             *
             * Note that this technique does use dynamic memory allocation.
             * If memory fragmentation is a concern, one possible optimization
             * would be to define a pool of CallId objects in which the name and
             * value sizes were fixed to some reasonable size. Then you could
             * allocate from the pool in most cases, and fall back to this
             * approach only if the name/value was too big for the pool objects
             * (or, perhaps, if the pool was empty).
             */

            /* try to allocate the memory for the entire object */
            OSPM_MALLOC(ospvCallId, OSPTCALLID,sizeof(OSPTCALLID) + ospvLen);

            /* make sure the allocation succeeded before proceeding */
            if (ospvCallId != OSPC_OSNULL)
            {
                /* calculate where the "hidden" values will go */
                valptr = ((unsigned char *)ospvCallId) + sizeof(OSPTCALLID);

                /* copy the values into their hidden location */
                OSPM_MEMCPY(valptr, ospvValue, ospvLen);

                /* fill in the structure fields */
                OSPPListLinkNew(&ospvCallId->ospmCallIdLink);
                ospvCallId->ospmCallIdLen = ospvLen;
                ospvCallId->ospmCallIdVal = valptr;
            }
        }
    }
    return(ospvCallId);
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPCallIdFromElement() - create a call id from an XML element
 *-----------------------------------------------------------------------*/

unsigned                          /* returns error code */
OSPPCallIdFromElement(
    OSPTXMLELEM *ospvElem,        /* input is XML element */
    OSPTCALLID **ospvCallId       /* where to put CallID pointer */
)
{
    unsigned      ospvErrCode = OSPC_ERR_NO_ERROR;
    unsigned char callIdValue[OSPC_CALLID_MAXSIZE+1];
    unsigned      callIdLen;

    if (ospvElem   == OSPC_OSNULL) 
    {
        ospvErrCode = OSPC_ERR_XML_NO_ELEMENT;
    }
    if (ospvCallId == OSPC_OSNULL) 
    {
        ospvErrCode = OSPC_ERR_DATA_NOCALLID;
    }
    /*    assert(OSPPMsgGetElemPart(OSPPXMLElemGetName(ospvElem)) ==
               ospeElemCallId);
    */

    /* start by assuming we will fail */
    *ospvCallId = OSPC_OSNULL;
    if (ospvErrCode == OSPC_ERR_NO_ERROR) 
    {

        callIdLen = sizeof(callIdValue)-1;
        ospvErrCode = OSPPMsgBinFromElement(ospvElem, &callIdLen, callIdValue);

        /* create the CallId structure */
        if (ospvErrCode == OSPC_ERR_NO_ERROR)
        {
            *ospvCallId = OSPPCallIdNew(callIdLen, callIdValue);
            if (*ospvCallId == OSPC_OSNULL)
            {
                ospvErrCode = OSPC_ERR_DATA_NOCALLID;
            }
        }
    }
    return(ospvErrCode);
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPCallIdDelete() - destroy a call identifier object
 *-----------------------------------------------------------------------*/
void                                  /* no return */
OSPPCallIdDelete(
    OSPTCALLID **ospvCallId            /* CallId to destroy */
)
{
    /*We free the whole callid at once because of the way
     * it is constructed.
     */

    if ((*ospvCallId != OSPC_OSNULL) &&
        (ospvCallId != OSPC_OSNULL))
    {
        OSPM_FREE(*ospvCallId);
        *ospvCallId = OSPC_OSNULL;
    }
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPCallIdToElement() - create an XML element from a call id
 *-----------------------------------------------------------------------*/
unsigned                           /* returns error code */
OSPPCallIdToElement(
    OSPTCALLID   *ospvCallId,      /* Call ID */
    OSPTXMLELEM **ospvElem,        /* where to put XML element pointer */
    OSPTBOOL    ospvIsBase64       /* indicates base64 or cdata */
)
{
    unsigned      ospvErrCode = OSPC_ERR_NO_ERROR;

    if (ospvElem   == OSPC_OSNULL) 
    {
        ospvErrCode = OSPC_ERR_XML_NO_ELEMENT;
    }
    if (ospvCallId == OSPC_OSNULL) 
    {
        ospvErrCode = OSPC_ERR_DATA_NOCALLID;
    }
    if (ospvErrCode == OSPC_ERR_NO_ERROR) 
    {
        ospvErrCode = OSPPMsgBinToElement(OSPPCallIdGetSize(ospvCallId),
            OSPPCallIdGetValue(ospvCallId),
            (const unsigned char *)OSPPMsgGetElemName(ospeElemCallId),
            ospvElem, ospvIsBase64);
    }

    return(ospvErrCode);
}

#ifdef OSPC_DEBUG
/**/
/*-----------------------------------------------------------------------*
 * OSPPCallIdGetSize() - returns size of call ID value
 *-----------------------------------------------------------------------*/
unsigned
OSPPCallIdGetSize(
    OSPTCALLID *ospvCallId
)
{
    unsigned ospvSize = 0;
    if (ospvCallId != OSPC_OSNULL) 
    {
        ospvSize = ((ospvCallId)->ospmCallIdLen);
    }
    return(ospvSize);
}


/**/
/*-----------------------------------------------------------------------*
 * OSPPCallIdGetValue() - returns pointer to call ID value
 *-----------------------------------------------------------------------*/
unsigned char *
OSPPCallIdGetValue(
    OSPTCALLID *ospvCallId
)
{
    unsigned char *ospvVal = OSPC_OSNULL;

    if (ospvCallId != OSPC_OSNULL) 
    {
        ospvVal = ospvCallId->ospmCallIdVal;
    }

    return(ospvVal);
}

#endif /* OSPC_DEBUG */