Function msOWSGetProjURN

mapows.c:1893–1949

** msOWSGetProjURN() ** ** Fetch an OGC URN for this layer or map. Similar to msOWSGetEPSGProj() ** but returns the result in the form "urn:ogc:def:crs:EPSG::27700". ** The returned buffer is dynamically allocated, and must be freed by the ** caller. */

** caller.
*/
char *msOWSGetProjURN(projectionObj *proj, hashTableObj *metadata, const char *namespaces, int bReturnOnlyFirstOne)
{
    char *result;
    char **tokens;
    int numtokens, i;
    size_t bufferSize = 0;
    
    const char *oldStyle = msOWSGetEPSGProj( proj, metadata, namespaces, 
                                             bReturnOnlyFirstOne );

    if( oldStyle == NULL || strncmp(oldStyle,"EPSG:",5) != 0 )
        return NULL;

    result = msStrdup("");

    tokens = msStringSplit(oldStyle, ' ', &numtokens);
    for(i=0; tokens != NULL && i<numtokens; i++)
    {
        char urn[100];

        if( strncmp(tokens[i],"EPSG:",5) == 0 )
            snprintf( urn, sizeof(urn), "urn:ogc:def:crs:EPSG::%s", tokens[i]+5 );
        else if( strcasecmp(tokens[i],"imageCRS") == 0 )
            snprintf( urn, sizeof(urn), "urn:ogc:def:crs:OGC::imageCRS" );
        else if( strncmp(tokens[i],"urn:ogc:def:crs:",16) == 0 ) {
            strlcpy( urn, tokens[i], sizeof(urn));
        }
        else {
            strlcpy( urn, "", sizeof(urn));
        }

        if( strlen(urn) > 0 )
        {
            bufferSize = strlen(result)+strlen(urn)+2;
            result = (char *) realloc(result, bufferSize);
            
            if( strlen(result) > 0 )
                strlcat( result, " ", bufferSize);
            strlcat( result, urn , bufferSize);
        }
        else
        {
            msDebug( "msOWSGetProjURN(): Failed to process SRS '%s', ignored.", 
                     tokens[i] );
        }
    }

    msFreeCharArray(tokens, numtokens);

    if( strlen(result) == 0 )
    {
        msFree( result );
        return NULL;
    }
    else
        return result;
}