cdfsamplingfromdata.c
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/* $Id: cdf constant samplig from data $ */
#include <stdio.h>
#include <stdlib.h>
#include <cdf.h>
#include <string.h>
#include <time.h>
#include <math.h>
#define MAX_FILE_NAME_LEN 120
#define badFile -100
/*************************************
Global variables and structures
**************************************/
long CDFDims, // Number of dimensions in a CDF file
CDFVars, // Number of variables in a CDF file
CDFDimSizes[CDF_MAX_DIMS], // Dimension Sizes in a CDF file
CDFencoding, // Data encoding
CDFmajority, // Variable majority
CDFmaxRec, // max Record number
CDFAttrs; // number of CDF Attributes
// CDFdatatype;
struct cdfvar { // CDF variable structure
char name[CDF_VAR_NAME_LEN+1];
long num; //variable number
long datatype;
long numElem; // variable dimensionality
long recVariance; // variable rec Variance
long dimVariances[CDF_MAX_DIMS]; // # of data values in dimSizes
} cdfVar;
/*--------------------------------------------------------------------------
* Handles a CDF error.
*--------------------------------------------------------------------------*/
void cdf_handle_error(CDFstatus status)
{
char message[CDF_STATUSTEXT_LEN+1];
CDFerror (status, message); /* Get the appropriate message */
fprintf (stderr, "%s\n", message);
exit(1);
}
int main(int argc, char *argv[])
{
char fileName[MAX_FILE_NAME_LEN];
long RecStart = 0, RecCount = 2, RecInt = 1;
long indices[1] = {0}, intervals[1] = {1}, counts[1] = {1};
long varN = -1;
long datatype = 0, attrN, maxEntry;
CDFstatus cstatus; // CDF status code
CDFid id;
double *value;
int i, minFalse = 0, numEnough;
char attrValue[300];
int sampling;
double epoch16[2], dbl_value, dbl_value_;
long year, month, day, hour, minute, sec, msec, mksec, nsec, psec;
long long *int_value;
if (argc <= 1)
exit(0); /* CDF input file name not specified */
else
strcpy(fileName, argv[argc-1]); /* Get the input file name */
/*********************** Open CDF file *****************************/
if ((cstatus = CDFopen(fileName, &id)) != CDF_OK)
cdf_handle_error(cstatus);
/*********** treat all vars as zVars with eliminated false dimensionality and get Nrecs **********/
if ((cstatus = CDFlib(SELECT_, CDF_zMODE_, zMODEon2, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
while (datatype != CDF_EPOCH && datatype != CDF_EPOCH16 && datatype != CDF_TIME_TT2000){
varN++;
if ((cstatus = CDFlib(SELECT_, zVAR_, varN,
GET_, zVAR_DATATYPE_, &datatype, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
}
fprintf(stdout,"DATATYPE %d %d\n", varN, datatype);
if ((cstatus = CDFlib(SELECT_, zVAR_, varN,
GET_, zVAR_MAXREC_, &CDFmaxRec, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
fprintf(stdout,"Max Recs %d\n", CDFmaxRec+1);
if (CDFmaxRec < 3) {
fprintf(stdout," %d\n", badFile);
exit (0);
}
if ( datatype == CDF_TIME_TT2000 ) {
int_value = (long long *) malloc (sizeof(long long) * (RecCount+1));
/******************* Get Epoch *************************/
if ((cstatus = CDFlib (SELECT_,
zVAR_, varN,
zVAR_RECNUMBER_, RecStart,
zVAR_RECCOUNT_, RecCount + 1,
zVAR_RECINTERVAL_, RecInt,
zVAR_DIMINDICES_, indices,
zVAR_DIMCOUNTS_, counts,
zVAR_DIMINTERVALS_, intervals,
GET_, zVAR_HYPERDATA_, int_value, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
}
else {
value = (double *)malloc(sizeof(double)* (RecCount + 1)*((datatype == CDF_EPOCH16)+1));
/******************* Get Epoch *************************/
if ((cstatus = CDFlib (SELECT_,
zVAR_, varN,
zVAR_RECNUMBER_, RecStart,
zVAR_RECCOUNT_, RecCount + 1,
zVAR_RECINTERVAL_, RecInt,
zVAR_DIMINDICES_, indices,
zVAR_DIMCOUNTS_, counts,
zVAR_DIMINTERVALS_, intervals,
GET_, zVAR_HYPERDATA_, value, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
}
if (datatype == CDF_TIME_TT2000) {
dbl_value_ = CDF_TT2000_to_UTC_EPOCH(int_value[0]);
dbl_value = CDF_TT2000_to_UTC_EPOCH(int_value[1]);
sampling = (int)(dbl_value - dbl_value_ + 50)/100;
}
else {
if (datatype == CDF_EPOCH16) {
epoch16[0] = value[0];
epoch16[1] = value[1];
EPOCH16breakdown(epoch16, &year, &month, &day, &hour, &minute, &sec, &msec, &mksec, &nsec, &psec);
value[0] = computeEPOCH(year, month, day, hour, minute, sec, msec);
epoch16[0] = value[2];
epoch16[1] = value[3];
EPOCH16breakdown(epoch16, &year, &month, &day, &hour, &minute, &sec, &msec, &mksec, &nsec, &psec);
value[1] = computeEPOCH(year, month, day, hour, minute, sec, msec);
}
sampling = (int)(value[1] - value[0] + 50)/100;
}
// fprintf(stdout,"value %f\n", value[11]-value[10]);
if (datatype == CDF_TIME_TT2000) free(int_value);
else free(value);
if ((cstatus = CDFlib(CLOSE_, CDF_, NULL_)) != CDF_OK)
cdf_handle_error (cstatus);
// fprintf(stdout,"%d %f\n",min[1], (float)min[0]/100.0);
fprintf(stdout,"%f\n",(float)sampling/10.0);
}