SVC_IO_UpdateReadPointer
Tells the I/O subsystem that the 'size' amount has been consumed ("read") from the current chunk of the input buffer. Next SVC_IO_GetReadPointer() call will return the pointer to the remaining portion of the chunk, or to the new chunk altogether if the 'size' consumes all the remaining portion of the current input buffer chunk.
Synopsis
void SVC_IO_UpdateReadPointer(FmMsgHandle token, int size);
Input parameters
This function assumes that the 'size' parameter does _not_ exceed the return value of the previous SVC_IO_GetReadPointer() call.