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readwrite.cc
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readwrite.cc
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#include <stdio.h>
#include <stdlib.h>
#include <hdf5.h>
#include "viirsresam.h"
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////
// This subroutine reads/writes VIIRS data from/to HDF5 file as unsigned short (2 byte unsigned integer)
// type array, to be scaled with gain and offset values.
//
// Arguments:
// unsigned short ** buffer IN/OUT If readwrite == 0, on output contains the pointer to an
// newly allocated array with read data; can be undefined on input;
// but caller is responsible for release of this memory later.
// If readwrite != 0, on input must contain the pointer to
// array with data to be written; unchanged on return.
//
// unsigned long long * dimsizes OUT On output contains the sizes of dimensions of 2d array
// dimsizes[0] = swath width (should be 3200, VIIRS)
// dimsizes[1] = height in pixels if granule (depends on size)
//
// float * gain OUT Returns gain parameter for scaling data
// float * offset OUT Returns offset parameter for scaling data
// Physical BT value = gain*buffer[0][i] + offset
//
// char * filename IN Name of HDF5 file from/to which read/write
//
// char * BTstr IN Name of data field in HDF5 file from/to which read/write
// Such as "All_Data/VIIRS-M12-SDR_All/BrightnessTemperature"
//
// int readwrite IN if readwrite == 0, read data
// if readwrite != 0, write data
//
// Return value:
// Upon sucessful completion, the return value is 0; nonzero return value indicates error.
/////////////////////////////////////////////////////////////////////////////////////////////////////////
int readwrite_viirs(unsigned short **buffer, unsigned long long * dimsizes, float * gain, float * offset,
char * filename, char * BTstr, int readwrite)
{
hid_t file_id, dataset, dataset_factors, dataspace;
herr_t hdferr;
int rank_BT, iprint = 0;
float gain_offset[2];
unsigned long long maxdimsizes[2];
char BTFstr[256];
sprintf(BTFstr,"%sFactors", BTstr);
if(iprint>0) printf("BTstr = %s\n", BTstr);
if(iprint>0) printf("BTFstr = %s\n", BTFstr);
hdferr = H5open();
if(hdferr!=0) {
printf("Cannot initialize HDF5 library!\n");
return -1;
}
if(readwrite==0) file_id = H5Fopen(filename, H5F_ACC_RDONLY, H5P_DEFAULT);
else file_id = H5Fopen(filename, H5F_ACC_RDWR, H5P_DEFAULT);
if(file_id<0) {
printf("Cannot open HDF5 file %s!\n", filename);
return -1;
}
dataset_factors = H5Dopen(file_id, BTFstr, H5P_DEFAULT);
if(dataset_factors<0) {
printf("Cannot open HDF5 dataset %s!\n", BTFstr);
return -1;
}
hdferr = H5Dread(dataset_factors, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, gain_offset);
if(hdferr<0) {
printf("Cannot read BT factors!\n");
return -1;
}
*gain = gain_offset[0];
*offset = gain_offset[1];
if(iprint>0) printf("gain = %3.8e offset = %3.8e\n", *gain, *offset);
hdferr = H5Dclose(dataset_factors);
if(hdferr<0) {
printf("Cannot close HDF5 dataset %s!\n", BTFstr);
return -1;
}
dataset = H5Dopen(file_id, BTstr, H5P_DEFAULT);
if(dataset<0) {
printf("Cannot open HDF5 dataset %s!\n", BTstr);
return -1;
}
dataspace = H5Dget_space(dataset);
if(dataspace<0) {
printf("Cannot open HDF5 dataspace for dataset %s!\n", BTstr);
return -1;
}
rank_BT = H5Sget_simple_extent_ndims(dataspace);
if(rank_BT!=2) {
printf("Unexpected rank of dataspace %i expected 2\n", rank_BT);
return -1;
}
rank_BT = H5Sget_simple_extent_dims(dataspace, dimsizes, maxdimsizes);
if(rank_BT<0) {
printf("Cannot get dataspace dimensions!\n");
return -1;
}
if(iprint>0) printf("dimsizes = %llu %llu\n", dimsizes[0], dimsizes[1]);
if(readwrite==0) {
*buffer = (unsigned short *) malloc(dimsizes[0]*dimsizes[1]*sizeof(unsigned short));
if(*buffer==NULL) {
printf("Cannot allocate memory\n");
return -1;
}
hdferr = H5Dread( dataset, H5T_NATIVE_USHORT, H5S_ALL, H5S_ALL, H5P_DEFAULT, *buffer);
if(hdferr<0) {
printf("Cannot read data to hdf!\n");
return -1;
}
} else {
hdferr = H5Dwrite(dataset, H5T_NATIVE_USHORT, H5S_ALL, H5S_ALL, H5P_DEFAULT, *buffer);
if(hdferr<0) {
printf("Cannot write data to hdf!\n");
return -1;
}
}
// close everything
hdferr = H5Dclose(dataset);
if(hdferr<0) {
printf("Cannot close HDF5 dataset %s!\n", BTstr);
return -1;
}
hdferr = H5Fclose(file_id);
if(hdferr<0) {
printf("Cannot close HDF5 file %s!\n", filename);
return -1;
}
hdferr = H5close();
if(hdferr<0) {
printf("Cannot close HDF5 library!\n");
return -1;
}
return 0;
};
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////
// This subroutine reads/writes VIIRS data from/to HDF5 file as float (4 byte floating point)
// type array. Used for VIIRS band M13.
//
// Arguments:
// float ** buffer IN/OUT If readwrite = 0, on output contains the pointer to an
// newly allocated array with read data; can be undefined on input.
// If readwrite != 0, on input must contain the pointer to
// array with data to be written; unchanged on return.
//
// unsigned long long * dimsizes OUT On output contains the sizes of dimensions of 2d array
// dimsizes[0] = swath width (should be 3200, VIIRS)
// dimsizes[1] = height in pixels if granule (depends on size)
//
// char * filename IN Name of HDF5 file from/to which read/write
//
// char * BTstr IN Name of data field in HDF5 file from/to which read/write
// Such as "All_Data/VIIRS-M12-SDR_All/BrightnessTemperature"
//
// int readwrite IN if readwrite = 0, read data
// if readwrite != 0, write data
//
// Return value:
// Upon sucessful completion, the return value is 0; nonzero return value indicates error.
/////////////////////////////////////////////////////////////////////////////////////////////////////////
int readwrite_viirs_float(float **buffer, unsigned long long * dimsizes, const char * filename, const char * BTstr, int readwrite)
{
hid_t file_id, dataset, dataspace;
herr_t hdferr;
int rank_BT, iprint = 0;
unsigned long long maxdimsizes[2];
if(iprint>0) printf("BTstr = %s\n", BTstr);
hdferr = H5open();
if(hdferr!=0) {
printf("Cannot initialize HDF5 library!\n");
return -1;
}
if(readwrite==0) file_id = H5Fopen(filename, H5F_ACC_RDONLY, H5P_DEFAULT);
else file_id = H5Fopen(filename, H5F_ACC_RDWR, H5P_DEFAULT);
if(file_id<0) {
printf("Cannot open HDF5 file %s!\n", filename);
return -1;
}
dataset = H5Dopen(file_id, BTstr, H5P_DEFAULT);
if(dataset<0) {
printf("Cannot open HDF5 dataset %s!\n", BTstr);
return -1;
}
dataspace = H5Dget_space(dataset);
if(dataspace<0) {
printf("Cannot open HDF5 dataspace for dataset %s!\n", BTstr);
return -1;
}
rank_BT = H5Sget_simple_extent_ndims(dataspace);
if(rank_BT!=2) {
printf("Unexpected rank of dataspace %i expected 2\n", rank_BT);
return -1;
}
rank_BT = H5Sget_simple_extent_dims(dataspace, dimsizes, maxdimsizes);
if(rank_BT<0) {
printf("Cannot get dataspace dimensions!\n");
return -1;
}
if(iprint>0) printf("dimsizes = %llu %llu\n", dimsizes[0], dimsizes[1]);
if(readwrite==0) {
*buffer = (float *) malloc(dimsizes[0]*dimsizes[1]*sizeof(float));
if(*buffer==NULL) {
printf("Cannot allocate memory\n");
return -1;
}
hdferr = H5Dread( dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, *buffer);
if(hdferr<0) {
printf("Cannot read data from hdf!\n");
return -1;
}
} else {
hdferr = H5Dwrite(dataset, H5T_NATIVE_FLOAT, H5S_ALL, H5S_ALL, H5P_DEFAULT, *buffer);
if(hdferr<0) {
printf("Cannot write data to hdf!\n");
return -1;
}
}
// close everything
hdferr = H5Dclose(dataset);
if(hdferr<0) {
printf("Cannot close HDF5 dataset %s!\n", BTstr);
return -1;
}
hdferr = H5Fclose(file_id);
if(hdferr<0) {
printf("Cannot close HDF5 file %s!\n", filename);
return -1;
}
hdferr = H5close();
if(hdferr<0) {
printf("Cannot close HDF5 library!\n");
return -1;
}
return 0;
};
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// This subroutine writes an attribute for a particular field in a HDF5 file.
//
// Arguments:
//
// char * filename IN Name of HDF5 file to which write an attribute
//
// char * attrFieldStr IN Name of data field in HDF5 file to which write an attribute
// Such as "All_Data/VIIRS-M12-SDR_All/BrightnessTemperature"
//
// char * attrNameStr IN Name of the attribute to write, such as "Resampling"
//
// float destrval IN Value of the attribute to write
//
// Return value:
// Upon sucessful completion, the return value is nonnegative;
// negative return value indicates error;
// positive return value indicates that the attribute was already set.
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
int write_viirs_attribute(const char *filename, const char *attrFieldStr, const char *attrNameStr, float destrval)
{
hid_t file_id, dataset;
herr_t hdferr;
int retval = 0;
hdferr = H5open();
if(hdferr!=0) {
printf("Cannot initialize HDF5 library!\n");
return -1;
}
file_id = H5Fopen(filename, H5F_ACC_RDWR, H5P_DEFAULT);
if(file_id<0) {
printf("Cannot open HDF5 file %s!\n", filename);
return -1;
}
dataset = H5Dopen(file_id, attrFieldStr, H5P_DEFAULT);
if(dataset<0) {
printf("Cannot open HDF5 dataset %s!\n", attrFieldStr);
return -1;
}
if(H5Aexists(dataset, attrNameStr)>0) {
// attribute already exists
retval = 1;
} else {
// attribute does not exist, create it
hid_t type_id = H5Tcopy(H5T_NATIVE_FLOAT);
if(type_id<0) {
printf("Cannot create a new datatype!\n");
return -1;
}
hid_t space_id = H5Screate(H5S_SCALAR);
if(space_id<0) {
printf("Cannot create a new dataspace!\n");
return -1;
}
hid_t attr_id = H5Acreate( dataset, attrNameStr, type_id, space_id, H5P_DEFAULT, H5P_DEFAULT);
if(attr_id<0) {
printf("Cannot create a HDF5 attribute\n");
return -1;
}
float destrval = 1.0;
float *pdestrval = &destrval;
hdferr = H5Awrite( attr_id, H5T_NATIVE_FLOAT, (const void *) pdestrval );
if(hdferr==-1) {
printf("Cannot write attribute!\n");
return -1;
}
}
// close everything
hdferr = H5Dclose(dataset);
if(hdferr<0) {
printf("Cannot close HDF5 dataset %s!\n", attrFieldStr);
return -1;
}
hdferr = H5Fclose(file_id);
if(hdferr<0) {
printf("Cannot close HDF5 file %s!\n", filename);
return -1;
}
hdferr = H5close();
if(hdferr<0) {
printf("Cannot close HDF5 library!\n");
return -1;
}
return retval;
};