Function ZL_CCtx_selectStartingGraphID 

pub unsafe extern "C" fn ZL_CCtx_selectStartingGraphID(
    cctx: *mut ZL_CCtx,
    compressor: *const ZL_Compressor,
    graphID: ZL_GraphID,
    rgp: *const ZL_GraphParameters,
) -> ZL_Report

@brief Set the starting Graph of next compression, as @p graphID referenced in the provided @p compressor, optionally providing it with some runtime parameters. @pre @p compressor must remain valid for the duration of its usage. @pre @p compressor must be already validated.

@param cctx The active compression state @param compressor The reference compressor containing graph definitions. If NULL, it uses the currently registered compressor. @param graphID The ID of the starting graph. @param rgp Optional parameters to apply to the starting graph. NULL means don’t override.

Note: like all global parameters, these parameters are reset at end of compression.