How to upgrade CUPS filter to not use deprecated PPD functions?

I would like to upgrade the CUPS filters in several drivers I have developed to remove the deprecated PPD calls and replace with the suggested 'cupsCopyDestInfo and friends'. Are there any sample filters that might show the upgrade logic? Everything I see still uses the standard ppd functions (ppdOpenFile, ppdFindMarkedChoice, etc.). I'm not seeing how to get the http_t parameter within a filter to use the new functions.


Thanks,

Tom