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/* Routines to handle FITS image data.
*/
#include <xos.h>
#include "fitsy.h"
/* Read data from a file pointer and convert it to the requested type.
*/
void *ft_dataread(file, fits, dataptr, pixtype)
File file; /* File pointer to read data from. */
FITSHead fits;
void *dataptr; /* Pointer to data buffer to store data. */
int pixtype; /* Pixtype to convert data to. */
{
void *fdata;
void *mdata;
size_t fsize;
size_t msize;
if ( file == NULL ) return NULL;
if ( fits == NULL ) return NULL;
if ( pixtype == FT_BITPIX )
pixtype = ft_bitpix(fits);
fsize = Abs(ft_bitpix(fits)/8);
msize = pixtype ? (size_t)((Abs(pixtype) & ~FT_UNSIGNED)/8) : fsize;
if ( dataptr == NULL ) {
Malloc(mdata, ft_fitsbloks(ft_datapixls(fits) * msize) * FT_BLOCK);
if ( mdata == NULL ) {
return NULL;
}
} else
mdata = dataptr;
if ( pixtype && msize != fsize ) {
Malloc(fdata, ft_databloks(fits) * FT_BLOCK);
if ( fdata == NULL ) {
if ( mdata && dataptr == NULL ) (void)Free(mdata);
return NULL;
}
} else
fdata = mdata;
/* Read in enough data but don't show an error in a short data
* block.
*/
if(ftRead(file, fdata, 1, ft_databloks(fits)*FT_BLOCK) < ft_databytes(fits)){
if ( dataptr == NULL ) {
if ( fdata != mdata ) (void)Free(fdata);
(void)Free(mdata);
}
return NULL;
}
if ( pixtype ) {
ft_dataswap(fdata, fdata, ft_databytes(fits), ft_bitpix(fits));
if ( pixtype != ft_bitpix(fits)
|| ft_hasbscale(fits)
|| ft_hasbzero(fits) ) {
ft_acht(pixtype, mdata, ft_bitpix(fits), fdata
, ft_datapixls(fits)
, 1
, ft_hasbscale(fits) || ft_hasbzero(fits)
, ft_bscale(fits)
, ft_bzero(fits));
}
}
if ( mdata != fdata ) (void)Free(fdata);
return mdata;
}
int ft_datawrite(file, fits, data, pixtype)
File file;
FITSHead fits;
void *data;
int pixtype;
{
void *fdata;
void *mdata = data;
int fsize;
int msize;
int pad;
char blok[FT_BLOCK];
if ( file == NULL ) return 0;
if ( fits == NULL ) return 0;
if ( pixtype == FT_BITPIX )
pixtype = ft_bitpix(fits);
fsize = Abs(ft_bitpix(fits)/8);
msize = pixtype ? (Abs(pixtype) & ~FT_UNSIGNED)/8 : fsize;
if ( pixtype && msize != fsize ) {
Malloc(fdata, ft_databloks(fits) * FT_BLOCK);
if ( fdata == NULL ) {
return 0;
}
} else
fdata = mdata;
if ( pixtype ) {
if ( pixtype != ft_bitpix(fits)
|| ft_hasbscale(fits)
|| ft_hasbzero(fits) ) {
ft_acht(ft_bitpix(fits), fdata, pixtype, mdata
, ft_datapixls(fits)
, 0
, ft_hasbscale(fits) || ft_hasbzero(fits)
, ft_bscale(fits)
, ft_bzero(fits));
}
ft_dataswap(fdata, fdata, ft_databytes(fits), ft_bitpix(fits));
}
memset(blok, 0, FT_BLOCK);
ftWrite(file, fdata, 1, ft_databytes(fits));
/* this is how John would do it ...
ftWrite(file, blok , 1,
(FT_BLOCK - ft_databytes(fits) % FT_BLOCK) % FT_BLOCK);
*/
/* ... and this is Eric's way ... */
pad = FT_BLOCK - ft_databytes(fits) % FT_BLOCK;
if( pad && (pad != FT_BLOCK) )
ftWrite(file, blok , 1, pad);
if ( mdata != fdata ) (void)Free(fdata);
return 1;
}
void swap2(to, from, nbytes)
char *to;
char *from;
size_t nbytes;
{
char c;
size_t i;
for ( i=0; i < nbytes; i += 2, (to += 2), (from += 2) ) {
c = *from;
*(to) = *(from+1);
*(to+1) = c;
}
}
void swap4(to, from, nbytes)
char *to;
char *from;
size_t nbytes;
{
char c;
size_t i;
for ( i=0; i < nbytes; i += 4, (to += 4), (from += 4) ) {
c = *from;
*to = *(from+3);
*(to+3) = c;
c = *(from+1);
*(to+1) = *(from+2);
*(to+2) = c;
}
}
void swap8(to, from, nbytes)
char *to;
char *from;
size_t nbytes;
{
char c;
size_t i;
for ( i=0; i < nbytes; i += 8, (to += 8), (from += 8) ) {
c = *(from+0);
*(to+0) = *(from+7);
*(to+7) = c;
c = *(from+1);
*(to+1) = *(from+6);
*(to+6) = c;
c = *(from+2);
*(to+2) = *(from+5);
*(to+5) = c;
c = *(from+3);
*(to+3) = *(from+4);
*(to+4) = c;
}
}
/* Swap n bytes of data if necessary.
*/
void *ft_dataswap(to, from, n, type)
void *to; /* Pointer to data to swap. */
void *from; /* Pointer to data to swap. */
size_t n; /* N bytes */
int type; /* Swap 2, swap 4, swap 8. */
{
if ( !from || !to ) return NULL;
if ( !ft_byteswap() ) {
if ( from == to ) return to;
memcpy(to, from, n);
return to;
}
if ( type && Abs(type) != 8 ) {
switch ( Abs(type) ) {
case 16: swap2(to, from, n); break;
case 32: swap4(to, from, n); break;
case 64: swap8(to, from, n); break;
}
}
return to;
}
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