ospaltinfo.c

mgcp协议源代码。支持多种编码：g711

/*
*########################################################################
*########################################################################
*########################################################################
*                                                               
*   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.                                      
*                                     
*
*
*
*
*
*
*#########################################################################
*#########################################################################
*#########################################################################
*/

/*
 * ospaltinfo.c - OSP alt info functions
 */

#include "osp.h"
#include "osperrno.h"
#include "ospmsgdesc.h"
#include "ospmsgelem.h"
#include "ospmsg.h"
#include "ospmsgattr.h"
#include "ospaltinfo.h"

OSP_TYPE_ATTR_STRUCT OSPVTypeStringTable[] = {
    {ospetypeupper,     "top"},
    {ospeE164,          "e164"},
    {ospeH323,          "h323"},
    {ospeUrl,           "url"},
    {ospeEmail,         "email"},
    {ospeTransport,     "transport"},
    {ospeInternational, "international"},
    {ospeNational,      "national"},
    {ospeNetwork,       "network"},
    {ospeSubscriber,    "subscriber"},
    {ospeAbbreviated,   "abbreviated"},
    {ospeE164prefix,    "e164prefix"},
    {ospetypelower,     "bottom"}
};

const unsigned OSPVNumElemAltInfoTypes = sizeof(OSPVTypeStringTable)/sizeof(OSP_TYPE_ATTR_STRUCT);


/**/
/*-----------------------------------------------------------------------*
 * OSPPAltInfoNew() - create a new altinfo object
 *-----------------------------------------------------------------------*/

OSPTALTINFO *                           /* returns ptr to altinfo or null */
    OSPPAltInfoNew(
    unsigned             ospvLen,      /* size of altinfo */
    const unsigned char *ospvValue,    /* altinfo value */
    OSPE_TYPE_ATTR_VAL   ospvType
    )
{
    OSPTALTINFO     *ospvAltInfo = OSPC_OSNULL;
    unsigned char   *valptr;

    /*
     * AltInfo objects are actually two parts -- the first is the AltInfo
     * structure and the second is the altinfo 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 altinfos
     * 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
     * altinfo 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 AltInfo 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).
     */

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

            /* try to allocate the memory for the entire object */
            OSPM_MALLOC(ospvAltInfo, OSPTALTINFO,sizeof(OSPTALTINFO) + ospvLen + 1);

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

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

                /* fill in the structure fields */
                OSPPListLinkNew(&ospvAltInfo->ospmAltInfoLink);
                ospvAltInfo->ospmAltInfoLen = ospvLen;
                ospvAltInfo->ospmAltInfoType = ospvType;
                ospvAltInfo->ospmAltInfoVal = valptr;
                ospvAltInfo->ospmAltInfoVal[ospvLen] = '\0';
            }
        }
    }

    return(ospvAltInfo);
}


#ifdef OSPC_DEBUG
/**/
/*-----------------------------------------------------------------------*
 * OSPPAltInfoDelete() - destroy a altinfo object
 *-----------------------------------------------------------------------*/
void                                  /* no return */
OSPPAltInfoDelete(
    OSPTALTINFO **ospvAltInfo            /* AltInfo to destroy */
)
{
    if (*ospvAltInfo != OSPC_OSNULL)
    {
        OSPM_FREE(*ospvAltInfo);
        *ospvAltInfo = OSPC_OSNULL;
    }
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPAltInfoGetSize() - returns size of altinfo value
 *-----------------------------------------------------------------------*/
unsigned
OSPPAltInfoGetSize(
    OSPTALTINFO *ospvAltInfo
)
{
    unsigned ospvSize = 0;
    if (ospvAltInfo != OSPC_OSNULL)
    {
        ospvSize = ospvAltInfo->ospmAltInfoLen;
    }
    return(ospvSize);
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPAltInfoGetType() - returns altinfo type
 *-----------------------------------------------------------------------*/
OSPE_TYPE_ATTR_VAL
    OSPPAltInfoGetType(
    OSPTALTINFO *ospvAltInfo
    )
{
    OSPE_TYPE_ATTR_VAL  ospvType = ospetypeupper;

    if (ospvAltInfo != OSPC_OSNULL)
    {
        ospvType = (OSPE_TYPE_ATTR_VAL)ospvAltInfo->ospmAltInfoType;
    }
    return(ospvType);
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPAltInfoGetValue() - returns pointer to altinfo value
 *-----------------------------------------------------------------------*/
const unsigned char *
OSPPAltInfoGetValue(
    OSPTALTINFO *ospvAltInfo
)
{
    const unsigned char *ospvVal = OSPC_OSNULL;
    if (ospvAltInfo != OSPC_OSNULL)
    {
        ospvVal = ospvAltInfo->ospmAltInfoVal;
    }
    return(ospvVal);
}

/**/
/*-----------------------------------------------------------------------*
 * OSPPAltInfoToElement() - create an XML element from a altinfo
 *-----------------------------------------------------------------------*/
unsigned                           /* returns error code */
OSPPAltInfoToElement(
    OSPTALTINFO             *ospvAltInfo,   /* In - altinfo */
    OSPTXMLELEM             **ospvElem,     /* Out - XML element pointer */
    OSPTMSGELEMPART         ospvPart        /* In -source or dest alternate */
)
{
    unsigned      ospvErrCode = OSPC_ERR_NO_ERROR;
    OSPTXMLATTR  *attr        = OSPC_OSNULL;

    if (ospvElem == OSPC_OSNULL)
    {
        ospvErrCode = OSPC_ERR_XML_NO_ELEMENT;
    }

    if (ospvAltInfo == OSPC_OSNULL)
    {
        ospvErrCode = OSPC_ERR_DATA_NO_ALTINFO;
    }

    if (ospvErrCode == OSPC_ERR_NO_ERROR)
    {
        *ospvElem = OSPPXMLElemNew(OSPPMsgGetElemName(ospvPart),
            (const char *)OSPPAltInfoGetValue(ospvAltInfo));

        if (ospvElem != OSPC_OSNULL)
        {
            attr = OSPPXMLAttrNew((const unsigned char *)OSPPMsgGetAttrName(
                ospeAttrType),
                (const unsigned char *)OSPPAltInfoGetTypeName(ospvAltInfo));

            if (attr == OSPC_OSNULL)
            {
                ospvErrCode = OSPC_ERR_XML_NO_ATTR;
            }

            if (ospvErrCode == OSPC_ERR_NO_ERROR)
            {
                OSPPXMLElemAddAttr(*ospvElem, attr);
            }
        }
    }
    return(ospvErrCode);
}

/*-----------------------------------------------------------------------*
 * OSPPAltInfoGetTypeName() - get type name from an altinfo
 *-----------------------------------------------------------------------*/

const char *                        /* Returns a pointer to the name */
OSPPAltInfoGetTypeName(
    OSPTALTINFO     *ospvAltInfo
)
{
    const char *ospvName = OSPC_OSNULL;
    OSPE_TYPE_ATTR_VAL  ospvType = ospetypeupper;
    unsigned int cnt = 0;

    ospvType = (OSPE_TYPE_ATTR_VAL)ospvAltInfo->ospmAltInfoType;

    for (cnt=0; cnt < OSPVNumElemAltInfoTypes; cnt++)
    {
        if (OSPVTypeStringTable[cnt].ospmType == ospvType)
        {
        ospvName = OSPVTypeStringTable[cnt].ospmTypeStr;
        break;
        }
    }
    return(ospvName);
}
#endif