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#include "gif.h"
/* just a small cleanup routine before we leave */
void cleanup(BYTE *ptr) {
if (ptr)
free(ptr);
}
/* Function : ReadHDF
** Return: 0 on completion without error, -1 on error
** Input: CHAR *h5_file - HDF file name
** CHAR *dset_name - Name of the HDF Image dataset
** CHAR *pal_name - Name of the HDF palette
** Output : BYTE** data - the HDF Image to be converted
** BYTE palette[256][3] - the corresponding palette
** hsize_t* image_size - the size of each dimension of the image
**
** Future Notes:
** The way readHDF works right now is that it expects the user
** to know the exact path to the HDF image. Thus it does not
** parse the HDF file looking for image datasets and corresponding
** palettes. Also it takes in the default palette for the image
** specified, if the palette is missing, it makes a default greyscale
** palette and throws it in.
**
*/
int ReadHDF(BYTE** data ,
BYTE palette[256][3] ,
hsize_t *image_size ,
CHAR *h5_file ,
CHAR *dset_name ,
CHAR *pal_name)
{
hid_t fHfile; /* H5 file to open */
herr_t status; /* status variable */
hid_t dspace; /* dataspace identifier for the the dataset */
hid_t dset; /* dataset identifier */
hid_t pal_set; /* dataset for palette */
hid_t pal_space;/* dataspace for palette */
hsize_t datasize; /* size of the image */
int pal_exist = 0; /* do we have a palette? */
/* check stuff */
if (!h5_file || !dset_name || !image_size) {
fprintf(stderr , "NULL is not an acceptable input for HDFread. Aborting.\n");
return -1;
}
/* do we have a palette ? */
if (pal_name) {
pal_exist = 1;
}
/* try opening the file */
/* H5 file open calls */
if ((fHfile = H5Fopen(h5_file , H5F_ACC_RDONLY , H5P_DEFAULT)) < 0) {
fprintf(stderr , "Unable to open HDF file for input. Aborting.\n");
return -1;
}
/* open the dataset for reading */
if ((dset = H5Dopen(fHfile , dset_name)) < 0) {
fprintf(stderr , "Unable to open dataset\n");
return -1;
}
/* get the dataspace */
if ((dspace = H5Dget_space(dset)) < 0) {
fprintf(stderr , "Unable to get dataspace\n");
return -1;
}
/* get the dimension size of the image */
if (H5Sget_simple_extent_dims(dspace , image_size , NULL) !=2 ) {
fprintf(stderr , "Unable to get dimension info\n");
return -1;
}
/* size needed to store the image */
datasize = image_size[0] * image_size[1];
/* allocate memory to store the image */
if ((*data = (BYTE*) malloc((size_t)datasize)) == NULL) {
fprintf(stderr , "Out of memory, exiting");
return -1;
}
/* get the actual image */
if ((status = H5Dread(dset , H5Dget_type(dset) , H5S_ALL , H5S_ALL , H5P_DEFAULT , *data)) < 0) {
fprintf(stderr , "Unable to read data \n");
cleanup(*data);
return -1;
}
if (pal_exist) {
hsize_t loc_pal_size[2];
hsize_t pal_datasize;
BYTE *temp_buf;
hsize_t temp_size;
/* get the palette dataset */
if ((pal_set = H5Dopen(fHfile , pal_name)) < 0) {
fprintf(stderr , "Unable to open dataset\n");
pal_exist = 0;
return -1;
}
/* get the dataspace */
if ((pal_space = H5Dget_space(pal_set)) < 0) {
fprintf(stderr , "Unable to get dataspace\n");
pal_exist = 0;
return -1;
}
/* get the dimension size of the palette. */
if (H5Sget_simple_extent_dims(pal_space , loc_pal_size , NULL) !=2 ) {
fprintf(stderr , "Unable to get dimension info\n");
pal_exist = 0;
return -1;
}
/* size needed to store the image */
pal_datasize = loc_pal_size[0] * loc_pal_size[1];
/* copy stuff into a temp buffer and then copy 256*3 elements to palette */
temp_size = H5Dget_storage_size(pal_set);
temp_buf = (BYTE*) malloc ((size_t)temp_size * sizeof(BYTE));
/* make sure that the palette is actually 256 X 3 so that we don't create overflows */
if (pal_datasize > 256 * 3)
{
fprintf(stderr , "Palette seems to be more than 256X3 bytes\n");
fprintf(stderr , "Truncating palette to 256 colors. This might cause a problem with the final image\n");
pal_datasize = 256 * 3;
}
/* get the actual palette */
if ((status = H5Dread(pal_set , H5Dget_type(pal_set) , H5S_ALL , H5S_ALL , H5P_DEFAULT , temp_buf)) < 0) {
fprintf(stderr , "Unable to read data \n");
cleanup(*data);
cleanup(temp_buf);
return -1;
}
/* copy stuff into the actual palette */
memcpy(palette , temp_buf , (size_t)pal_datasize);
/* get rid of the temp memory */
cleanup(temp_buf);
/* end of if (pal_exist) */
} else {
int i;
/* if palette does not exist we just go ahead and create a uniform greyscale palette */
for (i = 0 ; i < 256 ; i++) {
palette[i][0] = 255 - i;
palette[i][1] = 255 - i;
palette[i][2] = 255 - i;
}
}
/* close everything */
status = H5Dclose(dset);
status = H5Sclose(dspace);
status = H5Fclose(fHfile);
return 0;
}
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