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SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "@(#) swap_data.c 1.10 05/08/19 SwRI" #include #include #if defined (__MINGW32__) || defined (__MSVCRT__) #include #else #include #endif #include "libbase_idfs.h" /******************************************************************************* * * * IR_SWAP_DATA_ARRAY SUBROUTINE * * * * DESCRIPTION * * This routine is called to swap the data values to be in network order * * for the machine displaying the data. Only need to do this for data that * * are 2-bytes or 4-bytes. * * * * INPUT VARIABLES * * None * * * * USAGE * * ir_swap_data_array () * * * * NECESSARY SUBPROGRAMS * * abs() returns the absolute value of a number * * ntohs () network to host short conversion * * ntohl () network to host long conversion * * * * EXTERNAL VARIABLES * * struct general_info structure that holds information concerning * * ginfo the experiment that is being processed * * SDDAS_CHAR ir_swap_data flag that is used to determine when the data * * matrix is to be converted to host byte order * * * * INTERNAL VARIABLES * * struct experiment_info a pointer to the structure that holds * * *ex specific experiment information * * struct ptr_rec *ptr a pointer to the structure which holds all * * pointers to the header and data for the * * experiment of interest * * register SDDAS_ULONG *lpt data is interpreted as an array of longs * * register SDDAS_USHORT *spt data is interpreted as an array of shorts * * SDDAS_LONG num_items the number of elements in the data array * * SDDAS_LONG i looping variable * * SDDAS_LONG offset number of bytes that have already been * * converted to network order for the data record* * size_t num_bytes_slong the number of bytes needed for a SDDAS_LONG * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ void ir_swap_data_array (void) { extern struct general_info ginfo; extern SDDAS_CHAR ir_swap_data; struct experiment_info *ex; struct ptr_rec *ptr; register SDDAS_ULONG *lpt; register SDDAS_USHORT *spt; SDDAS_LONG num_items, i, offset; size_t num_bytes_slong; /*************************************************************************/ /* Swap the data block within the data record if it has not already */ /* been done. */ /*************************************************************************/ if (!ir_swap_data) return; /****************************************************************************/ /* Determine the no. of bytes that preceed the actual data_array contained */ /* within the actual data record being processed. These items have */ /* already been converted to network order. Don't forget to bypass the */ /* nanosecond correction value, if defined. This scheme will work for */ /* scalar, vector and tensor data sets. */ /****************************************************************************/ ex = ginfo.expt; num_bytes_slong = sizeof (SDDAS_LONG); offset = num_bytes_slong + num_bytes_slong + num_bytes_slong + (num_bytes_slong * ex->max_nss) + num_bytes_slong; if (ex->nano_defined) offset += num_bytes_slong; /****************************************************************************/ /* When using multiple sensor sets, each sensor set may use a different */ /* header record. There is no mandate that says N_SAMPLE or N_SEN need to */ /* stay the same within a data record using multiple sensor sets. */ /* Therefore, use the data_len value from the VIDF and subtract off bytes */ /* that have already been changed to network order. */ /****************************************************************************/ ir_swap_data = 0; if (ex->tdw_len >= 9 && ex->tdw_len <= 16) /* interpret as shorts */ { /* Convert value in bytes into no. of short values to be processed. */ ptr = ex->info_ptr; num_items = (ptr->d_size - offset) / sizeof (SDDAS_USHORT); spt = (SDDAS_USHORT *) ptr->DATA; for (i = 0; i < num_items; ++i) *(spt + i) = ntohs (*(spt + i)); } else if (ex->tdw_len >= 17 && ex->tdw_len <= 32) /* interpret as longs */ { /* Convert value in bytes into no. of long values to be processed. */ ptr = ex->info_ptr; num_items = (ptr->d_size - offset) / sizeof (SDDAS_ULONG); lpt = (SDDAS_ULONG *) ptr->DATA; for (i = 0; i < num_items; ++i) *(lpt + i) = ntohl (*(lpt + i)); } }