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imcompress.c
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imcompress.c
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# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <math.h>
# include <ctype.h>
# include <time.h>
# include "fitsio2.h"
#define NULL_VALUE -2147483647 /* value used to represent undefined pixels */
#define ZERO_VALUE -2147483646 /* value used to represent zero-valued pixels */
/* nearest integer function */
# define NINT(x) ((x >= 0.) ? (int) (x + 0.5) : (int) (x - 0.5))
/* special quantize level value indicates that floating point image pixels */
/* should not be quantized and instead losslessly compressed (with GZIP) */
#define NO_QUANTIZE 9999
/* string array for storing the individual column compression stats */
char results[999][30];
float *fits_rand_value = 0;
int imcomp_write_nocompress_tile(fitsfile *outfptr, long row, int datatype,
void *tiledata, long tilelen, int nullcheck, void *nullflagval, int *status);
int imcomp_convert_tile_tshort(fitsfile *outfptr, void *tiledata, long tilelen,
int nullcheck, void *nullflagval, int nullval, int zbitpix, double scale,
double zero, double actual_bzero, int *intlength, int *status);
int imcomp_convert_tile_tushort(fitsfile *outfptr, void *tiledata, long tilelen,
int nullcheck, void *nullflagval, int nullval, int zbitpix, double scale,
double zero, int *intlength, int *status);
int imcomp_convert_tile_tint(fitsfile *outfptr, void *tiledata, long tilelen,
int nullcheck, void *nullflagval, int nullval, int zbitpix, double scale,
double zero, int *intlength, int *status);
int imcomp_convert_tile_tuint(fitsfile *outfptr, void *tiledata, long tilelen,
int nullcheck, void *nullflagval, int nullval, int zbitpix, double scale,
double zero, int *intlength, int *status);
int imcomp_convert_tile_tbyte(fitsfile *outfptr, void *tiledata, long tilelen,
int nullcheck, void *nullflagval, int nullval, int zbitpix, double scale,
double zero, int *intlength, int *status);
int imcomp_convert_tile_tsbyte(fitsfile *outfptr, void *tiledata, long tilelen,
int nullcheck, void *nullflagval, int nullval, int zbitpix, double scale,
double zero, int *intlength, int *status);
int imcomp_convert_tile_tfloat(fitsfile *outfptr, long row, void *tiledata, long tilelen,
long tilenx, long tileny, int nullcheck, void *nullflagval, int nullval, int zbitpix,
double scale, double zero, int *intlength, int *flag, double *bscale, double *bzero,int *status);
int imcomp_convert_tile_tdouble(fitsfile *outfptr, long row, void *tiledata, long tilelen,
long tilenx, long tileny, int nullcheck, void *nullflagval, int nullval, int zbitpix,
double scale, double zero, int *intlength, int *flag, double *bscale, double *bzero, int *status);
static int unquantize_i1r4(long row,
unsigned char *input, /* I - array of values to be converted */
long ntodo, /* I - number of elements in the array */
double scale, /* I - FITS TSCALn or BSCALE value */
double zero, /* I - FITS TZEROn or BZERO value */
int dither_method, /* I - which subtractive dither method to use */
int nullcheck, /* I - null checking code; 0 = don't check */
/* 1:set null pixels = nullval */
/* 2: if null pixel, set nullarray = 1 */
unsigned char tnull, /* I - value of FITS TNULLn keyword if any */
float nullval, /* I - set null pixels, if nullcheck = 1 */
char *nullarray, /* I - bad pixel array, if nullcheck = 2 */
int *anynull, /* O - set to 1 if any pixels are null */
float *output, /* O - array of converted pixels */
int *status); /* IO - error status */
static int unquantize_i2r4(long row,
short *input, /* I - array of values to be converted */
long ntodo, /* I - number of elements in the array */
double scale, /* I - FITS TSCALn or BSCALE value */
double zero, /* I - FITS TZEROn or BZERO value */
int dither_method, /* I - which subtractive dither method to use */
int nullcheck, /* I - null checking code; 0 = don't check */
/* 1:set null pixels = nullval */
/* 2: if null pixel, set nullarray = 1 */
short tnull, /* I - value of FITS TNULLn keyword if any */
float nullval, /* I - set null pixels, if nullcheck = 1 */
char *nullarray, /* I - bad pixel array, if nullcheck = 2 */
int *anynull, /* O - set to 1 if any pixels are null */
float *output, /* O - array of converted pixels */
int *status); /* IO - error status */
static int unquantize_i4r4(long row,
INT32BIT *input, /* I - array of values to be converted */
long ntodo, /* I - number of elements in the array */
double scale, /* I - FITS TSCALn or BSCALE value */
double zero, /* I - FITS TZEROn or BZERO value */
int dither_method, /* I - which subtractive dither method to use */
int nullcheck, /* I - null checking code; 0 = don't check */
/* 1:set null pixels = nullval */
/* 2: if null pixel, set nullarray = 1 */
INT32BIT tnull, /* I - value of FITS TNULLn keyword if any */
float nullval, /* I - set null pixels, if nullcheck = 1 */
char *nullarray, /* I - bad pixel array, if nullcheck = 2 */
int *anynull, /* O - set to 1 if any pixels are null */
float *output, /* O - array of converted pixels */
int *status); /* IO - error status */
static int unquantize_i1r8(long row,
unsigned char *input, /* I - array of values to be converted */
long ntodo, /* I - number of elements in the array */
double scale, /* I - FITS TSCALn or BSCALE value */
double zero, /* I - FITS TZEROn or BZERO value */
int dither_method, /* I - which subtractive dither method to use */
int nullcheck, /* I - null checking code; 0 = don't check */
/* 1:set null pixels = nullval */
/* 2: if null pixel, set nullarray = 1 */
unsigned char tnull, /* I - value of FITS TNULLn keyword if any */
double nullval, /* I - set null pixels, if nullcheck = 1 */
char *nullarray, /* I - bad pixel array, if nullcheck = 2 */
int *anynull, /* O - set to 1 if any pixels are null */
double *output, /* O - array of converted pixels */
int *status); /* IO - error status */
static int unquantize_i2r8(long row,
short *input, /* I - array of values to be converted */
long ntodo, /* I - number of elements in the array */
double scale, /* I - FITS TSCALn or BSCALE value */
double zero, /* I - FITS TZEROn or BZERO value */
int dither_method, /* I - which subtractive dither method to use */
int nullcheck, /* I - null checking code; 0 = don't check */
/* 1:set null pixels = nullval */
/* 2: if null pixel, set nullarray = 1 */
short tnull, /* I - value of FITS TNULLn keyword if any */
double nullval, /* I - set null pixels, if nullcheck = 1 */
char *nullarray, /* I - bad pixel array, if nullcheck = 2 */
int *anynull, /* O - set to 1 if any pixels are null */
double *output, /* O - array of converted pixels */
int *status); /* IO - error status */
static int unquantize_i4r8(long row,
INT32BIT *input, /* I - array of values to be converted */
long ntodo, /* I - number of elements in the array */
double scale, /* I - FITS TSCALn or BSCALE value */
double zero, /* I - FITS TZEROn or BZERO value */
int dither_method, /* I - which subtractive dither method to use */
int nullcheck, /* I - null checking code; 0 = don't check */
/* 1:set null pixels = nullval */
/* 2: if null pixel, set nullarray = 1 */
INT32BIT tnull, /* I - value of FITS TNULLn keyword if any */
double nullval, /* I - set null pixels, if nullcheck = 1 */
char *nullarray, /* I - bad pixel array, if nullcheck = 2 */
int *anynull, /* O - set to 1 if any pixels are null */
double *output, /* O - array of converted pixels */
int *status); /* IO - error status */
static int imcomp_float2nan(float *indata, long tilelen, int *outdata,
float nullflagval, int *status);
static int imcomp_double2nan(double *indata, long tilelen, LONGLONG *outdata,
double nullflagval, int *status);
static int fits_read_write_compressed_img(fitsfile *fptr, /* I - FITS file pointer */
int datatype, /* I - datatype of the array to be returned */
LONGLONG *infpixel, /* I - 'bottom left corner' of the subsection */
LONGLONG *inlpixel, /* I - 'top right corner' of the subsection */
long *ininc, /* I - increment to be applied in each dimension */
int nullcheck, /* I - 0 for no null checking */
/* 1: set undefined pixels = nullval */
void *nullval, /* I - value for undefined pixels */
int *anynul, /* O - set to 1 if any values are null; else 0 */
fitsfile *outfptr, /* I - FITS file pointer */
int *status);
static int fits_shuffle_8bytes(char *heap, LONGLONG length, int *status);
static int fits_shuffle_4bytes(char *heap, LONGLONG length, int *status);
static int fits_shuffle_2bytes(char *heap, LONGLONG length, int *status);
static int fits_unshuffle_8bytes(char *heap, LONGLONG length, int *status);
static int fits_unshuffle_4bytes(char *heap, LONGLONG length, int *status);
static int fits_unshuffle_2bytes(char *heap, LONGLONG length, int *status);
static int fits_int_to_longlong_inplace(int *intarray, long length, int *status);
static int fits_short_to_int_inplace(short *intarray, long length, int shift, int *status);
static int fits_ushort_to_int_inplace(unsigned short *intarray, long length, int shift, int *status);
static int fits_sbyte_to_int_inplace(signed char *intarray, long length, int *status);
static int fits_ubyte_to_int_inplace(unsigned char *intarray, long length, int *status);
static int fits_calc_tile_rows(long *tlpixel, long *tfpixel, int ndim, long *trowsize, long *ntrows, int *status);
/* only used for diagnoitic purposes */
/* int fits_get_case(int *c1, int*c2, int*c3); */
/*---------------------------------------------------------------------------*/
int fits_init_randoms(void) {
/* initialize an array of random numbers */
int ii;
double a = 16807.0;
double m = 2147483647.0;
double temp, seed;
FFLOCK;
if (fits_rand_value) {
FFUNLOCK;
return(0); /* array is already initialized */
}
/* allocate array for the random number sequence */
/* THIS MEMORY IS NEVER FREED */
fits_rand_value = calloc(N_RANDOM, sizeof(float));
if (!fits_rand_value) {
FFUNLOCK;
return(MEMORY_ALLOCATION);
}
/* We need a portable algorithm that anyone can use to generate this
exact same sequence of random number. The C 'rand' function is not
suitable because it is not available to Fortran or Java programmers.
Instead, use a well known simple algorithm published here:
"Random number generators: good ones are hard to find", Communications of the ACM,
Volume 31 , Issue 10 (October 1988) Pages: 1192 - 1201
*/
/* initialize the random numbers */
seed = 1;
for (ii = 0; ii < N_RANDOM; ii++) {
temp = a * seed;
seed = temp -m * ((int) (temp / m) );
fits_rand_value[ii] = (float) (seed / m);
}
FFUNLOCK;
/*
IMPORTANT NOTE: the 10000th seed value must have the value 1043618065 if the
algorithm has been implemented correctly */
if ( (int) seed != 1043618065) {
ffpmsg("fits_init_randoms generated incorrect random number sequence");
return(1);
} else {
return(0);
}
}
/*--------------------------------------------------------------------------*/
void bz_internal_error(int errcode)
{
/* external function declared by the bzip2 code in bzlib_private.h */
ffpmsg("bzip2 returned an internal error");
ffpmsg("This should never happen");
return;
}
/*--------------------------------------------------------------------------*/
int fits_set_compression_type(fitsfile *fptr, /* I - FITS file pointer */
int ctype, /* image compression type code; */
/* allowed values: RICE_1, GZIP_1, GZIP_2, PLIO_1, */
/* HCOMPRESS_1, BZIP2_1, and NOCOMPRESS */
int *status) /* IO - error status */
{
/*
This routine specifies the image compression algorithm that should be
used when writing a FITS image. The image is divided into tiles, and
each tile is compressed and stored in a row of at variable length binary
table column.
*/
if (ctype != RICE_1 &&
ctype != GZIP_1 &&
ctype != GZIP_2 &&
ctype != PLIO_1 &&
ctype != HCOMPRESS_1 &&
ctype != BZIP2_1 &&
ctype != NOCOMPRESS &&
ctype != 0)
{
ffpmsg("unknown compression algorithm (fits_set_compression_type)");
*status = DATA_COMPRESSION_ERR;
} else {
(fptr->Fptr)->request_compress_type = ctype;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_tile_dim(fitsfile *fptr, /* I - FITS file pointer */
int ndim, /* number of dimensions in the compressed image */
long *dims, /* size of image compression tile in each dimension */
/* default tile size = (NAXIS1, 1, 1, ...) */
int *status) /* IO - error status */
{
/*
This routine specifies the size (dimension) of the image
compression tiles that should be used when writing a FITS
image. The image is divided into tiles, and each tile is compressed
and stored in a row of at variable length binary table column.
*/
int ii;
if (ndim < 0 || ndim > MAX_COMPRESS_DIM)
{
*status = BAD_DIMEN;
ffpmsg("illegal number of tile dimensions (fits_set_tile_dim)");
return(*status);
}
for (ii = 0; ii < ndim; ii++)
{
(fptr->Fptr)->request_tilesize[ii] = dims[ii];
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_quantize_level(fitsfile *fptr, /* I - FITS file pointer */
float qlevel, /* floating point quantization level */
int *status) /* IO - error status */
{
/*
This routine specifies the value of the quantization level, q, that
should be used when compressing floating point images. The image is
divided into tiles, and each tile is compressed and stored in a row
of at variable length binary table column.
*/
if (qlevel == 0.)
{
/* this means don't quantize the floating point values. Instead, */
/* the floating point values will be losslessly compressed */
(fptr->Fptr)->request_quantize_level = NO_QUANTIZE;
} else {
(fptr->Fptr)->request_quantize_level = qlevel;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_quantize_method(fitsfile *fptr, /* I - FITS file pointer */
int method, /* quantization method */
int *status) /* IO - error status */
{
/*
This routine specifies what type of dithering (randomization) should
be performed when quantizing floating point images to integer prior to
compression. A value of -1 means do no dithering. A value of 0 means
use the default SUBTRACTIVE_DITHER_1 (which is equivalent to dither = 1).
A value of 2 means use SUBTRACTIVE_DITHER_2.
*/
if (method < -1 || method > 2)
{
ffpmsg("illegal dithering value (fits_set_quantize_method)");
*status = DATA_COMPRESSION_ERR;
} else {
if (method == 0) method = 1;
(fptr->Fptr)->request_quantize_method = method;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_quantize_dither(fitsfile *fptr, /* I - FITS file pointer */
int dither, /* dither type */
int *status) /* IO - error status */
{
/*
the name of this routine has changed. This is kept here only for backwards
compatibility for any software that may be calling the old routine.
*/
fits_set_quantize_method(fptr, dither, status);
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_dither_seed(fitsfile *fptr, /* I - FITS file pointer */
int seed, /* random dithering seed value (1 to 10000) */
int *status) /* IO - error status */
{
/*
This routine specifies the value of the offset that should be applied when
calculating the random dithering when quantizing floating point iamges.
A random offset should be applied to each image to avoid quantization
effects when taking the difference of 2 images, or co-adding a set of
images. Without this random offset, the corresponding pixel in every image
will have exactly the same dithering.
offset = 0 means use the default random dithering based on system time
offset = negative means randomly chose dithering based on 1st tile checksum
offset = [1 - 10000] means use that particular dithering pattern
*/
/* if positive, ensure that the value is in the range 1 to 10000 */
if (seed > 10000) {
ffpmsg("illegal dithering seed value (fits_set_dither_seed)");
*status = DATA_COMPRESSION_ERR;
} else {
(fptr->Fptr)->request_dither_seed = seed;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_dither_offset(fitsfile *fptr, /* I - FITS file pointer */
int offset, /* random dithering offset value (1 to 10000) */
int *status) /* IO - error status */
{
/*
The name of this routine has changed. This is kept just for
backwards compatibility with any software that calls the old name
*/
fits_set_dither_seed(fptr, offset, status);
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_noise_bits(fitsfile *fptr, /* I - FITS file pointer */
int noisebits, /* noise_bits parameter value */
/* (default = 4) */
int *status) /* IO - error status */
{
/*
********************************************************************
********************************************************************
THIS ROUTINE IS PROVIDED ONLY FOR BACKWARDS COMPATIBILITY;
ALL NEW SOFTWARE SHOULD CALL fits_set_quantize_level INSTEAD
********************************************************************
********************************************************************
This routine specifies the value of the noice_bits parameter that
should be used when compressing floating point images. The image is
divided into tiles, and each tile is compressed and stored in a row
of at variable length binary table column.
Feb 2008: the "noisebits" parameter has been replaced with the more
general "quantize level" parameter.
*/
float qlevel;
if (noisebits < 1 || noisebits > 16)
{
*status = DATA_COMPRESSION_ERR;
ffpmsg("illegal number of noise bits (fits_set_noise_bits)");
return(*status);
}
qlevel = (float) pow (2., (double)noisebits);
fits_set_quantize_level(fptr, qlevel, status);
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_hcomp_scale(fitsfile *fptr, /* I - FITS file pointer */
float scale, /* hcompress scale parameter value */
/* (default = 0.) */
int *status) /* IO - error status */
{
/*
This routine specifies the value of the hcompress scale parameter.
*/
(fptr->Fptr)->request_hcomp_scale = scale;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_hcomp_smooth(fitsfile *fptr, /* I - FITS file pointer */
int smooth, /* hcompress smooth parameter value */
/* if scale > 1 and smooth != 0, then */
/* the image will be smoothed when it is */
/* decompressed to remove some of the */
/* 'blockiness' in the image produced */
/* by the lossy compression */
int *status) /* IO - error status */
{
/*
This routine specifies the value of the hcompress scale parameter.
*/
(fptr->Fptr)->request_hcomp_smooth = smooth;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_lossy_int(fitsfile *fptr, /* I - FITS file pointer */
int lossy_int, /* I - True (!= 0) or False (0) */
int *status) /* IO - error status */
{
/*
This routine specifies whether images with integer pixel values should
quantized and compressed the same way float images are compressed.
The default is to not do this, and instead apply a lossless compression
algorithm to integer images.
*/
(fptr->Fptr)->request_lossy_int_compress = lossy_int;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_huge_hdu(fitsfile *fptr, /* I - FITS file pointer */
int huge, /* I - True (!= 0) or False (0) */
int *status) /* IO - error status */
{
/*
This routine specifies whether the HDU that is being compressed is so large
(i.e., > 4 GB) that the 'Q' type variable length array columns should be used
rather than the normal 'P' type. The allows the heap pointers to be stored
as 64-bit quantities, rather than just 32-bits.
*/
(fptr->Fptr)->request_huge_hdu = huge;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_get_compression_type(fitsfile *fptr, /* I - FITS file pointer */
int *ctype, /* image compression type code; */
/* allowed values: */
/* RICE_1, GZIP_1, GZIP_2, PLIO_1, HCOMPRESS_1, BZIP2_1 */
int *status) /* IO - error status */
{
/*
This routine returns the image compression algorithm that should be
used when writing a FITS image. The image is divided into tiles, and
each tile is compressed and stored in a row of at variable length binary
table column.
*/
*ctype = (fptr->Fptr)->request_compress_type;
if (*ctype != RICE_1 &&
*ctype != GZIP_1 &&
*ctype != GZIP_2 &&
*ctype != PLIO_1 &&
*ctype != HCOMPRESS_1 &&
*ctype != BZIP2_1 &&
*ctype != NOCOMPRESS &&
*ctype != 0 )
{
ffpmsg("unknown compression algorithm (fits_get_compression_type)");
*status = DATA_COMPRESSION_ERR;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_get_tile_dim(fitsfile *fptr, /* I - FITS file pointer */
int ndim, /* number of dimensions in the compressed image */
long *dims, /* size of image compression tile in each dimension */
/* default tile size = (NAXIS1, 1, 1, ...) */
int *status) /* IO - error status */
{
/*
This routine returns the size (dimension) of the image
compression tiles that should be used when writing a FITS
image. The image is divided into tiles, and each tile is compressed
and stored in a row of at variable length binary table column.
*/
int ii;
if (ndim < 0 || ndim > MAX_COMPRESS_DIM)
{
*status = BAD_DIMEN;
ffpmsg("illegal number of tile dimensions (fits_get_tile_dim)");
return(*status);
}
for (ii = 0; ii < ndim; ii++)
{
dims[ii] = (fptr->Fptr)->request_tilesize[ii];
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_unset_compression_param(
fitsfile *fptr,
int *status)
{
int ii;
(fptr->Fptr)->compress_type = 0;
(fptr->Fptr)->quantize_level = 0;
(fptr->Fptr)->quantize_method = 0;
(fptr->Fptr)->dither_seed = 0;
(fptr->Fptr)->hcomp_scale = 0;
for (ii = 0; ii < MAX_COMPRESS_DIM; ii++)
{
(fptr->Fptr)->tilesize[ii] = 0;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_unset_compression_request(
fitsfile *fptr,
int *status)
{
int ii;
(fptr->Fptr)->request_compress_type = 0;
(fptr->Fptr)->request_quantize_level = 0;
(fptr->Fptr)->request_quantize_method = 0;
(fptr->Fptr)->request_dither_seed = 0;
(fptr->Fptr)->request_hcomp_scale = 0;
(fptr->Fptr)->request_lossy_int_compress = 0;
(fptr->Fptr)->request_huge_hdu = 0;
for (ii = 0; ii < MAX_COMPRESS_DIM; ii++)
{
(fptr->Fptr)->request_tilesize[ii] = 0;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_set_compression_pref(
fitsfile *infptr,
fitsfile *outfptr,
int *status)
{
/*
Set the preference for various compression options, based
on keywords in the input file that
provide guidance about how the HDU should be compressed when written
to the output file.
*/
int ii, naxis, nkeys, comptype;
int ivalue;
long tiledim[6]= {1,1,1,1,1,1};
char card[FLEN_CARD], value[FLEN_VALUE];
double qvalue;
float hscale;
LONGLONG datastart, dataend;
if (*status > 0)
return(*status);
/* check the size of the HDU that is to be compressed */
fits_get_hduaddrll(infptr, NULL, &datastart, &dataend, status);
if ( (LONGLONG)(dataend - datastart) > UINT32_MAX) {
/* use 64-bit '1Q' variable length columns instead of '1P' columns */
/* for large files, in case the heap size becomes larger than 2**32 bytes*/
fits_set_huge_hdu(outfptr, 1, status);
}
fits_get_hdrspace(infptr, &nkeys, NULL, status);
/* look for a image compression directive keywords (begin with 'FZ') */
for (ii = 2; ii <= nkeys; ii++) {
fits_read_record(infptr, ii, card, status);
if (!strncmp(card, "FZ", 2) ){
/* get the keyword value string */
fits_parse_value(card, value, NULL, status);
if (!strncmp(card+2, "ALGOR", 5) ) {
/* set the desired compression algorithm */
/* allowed values: RICE_1, GZIP_1, GZIP_2, PLIO_1, */
/* HCOMPRESS_1, BZIP2_1, and NOCOMPRESS */
if (!fits_strncasecmp(value, "'RICE_1", 7) ) {
comptype = RICE_1;
} else if (!fits_strncasecmp(value, "'GZIP_1", 7) ) {
comptype = GZIP_1;
} else if (!fits_strncasecmp(value, "'GZIP_2", 7) ) {
comptype = GZIP_2;
} else if (!fits_strncasecmp(value, "'PLIO_1", 7) ) {
comptype = PLIO_1;
} else if (!fits_strncasecmp(value, "'HCOMPRESS_1", 12) ) {
comptype = HCOMPRESS_1;
} else if (!fits_strncasecmp(value, "'NONE", 5) ) {
comptype = NOCOMPRESS;
} else {
ffpmsg("Unknown FZALGOR keyword compression algorithm:");
ffpmsg(value);
return(*status = DATA_COMPRESSION_ERR);
}
fits_set_compression_type (outfptr, comptype, status);
} else if (!strncmp(card+2, "TILE ", 6) ) {
if (!fits_strncasecmp(value, "'row", 4) ) {
tiledim[0] = -1;
} else if (!fits_strncasecmp(value, "'whole", 6) ) {
tiledim[0] = -1;
tiledim[1] = -1;
tiledim[2] = -1;
} else {
ffdtdm(infptr, value, 0,6, &naxis, tiledim, status);
}
/* set the desired tile size */
fits_set_tile_dim (outfptr, 6, tiledim, status);
} else if (!strncmp(card+2, "QVALUE", 6) ) {
/* set the desired Q quantization value */
qvalue = atof(value);
fits_set_quantize_level (outfptr, (float) qvalue, status);
} else if (!strncmp(card+2, "QMETHD", 6) ) {
if (!fits_strncasecmp(value, "'no_dither", 10) ) {
ivalue = -1; /* just quantize, with no dithering */
} else if (!fits_strncasecmp(value, "'subtractive_dither_1", 21) ) {
ivalue = SUBTRACTIVE_DITHER_1; /* use subtractive dithering */
} else if (!fits_strncasecmp(value, "'subtractive_dither_2", 21) ) {
ivalue = SUBTRACTIVE_DITHER_2; /* dither, except preserve zero-valued pixels */
} else {
ffpmsg("Unknown value for FZQUANT keyword: (set_compression_pref)");
ffpmsg(value);
return(*status = DATA_COMPRESSION_ERR);
}
fits_set_quantize_method(outfptr, ivalue, status);
} else if (!strncmp(card+2, "DTHRSD", 6) ) {
if (!fits_strncasecmp(value, "'checksum", 9) ) {
ivalue = -1; /* use checksum of first tile */
} else if (!fits_strncasecmp(value, "'clock", 6) ) {
ivalue = 0; /* set dithering seed based on system clock */
} else { /* read integer value */
if (*value == '\'')
ivalue = (int) atol(value+1); /* allow for leading quote character */
else
ivalue = (int) atol(value);
if (ivalue < 1 || ivalue > 10000) {
ffpmsg("Invalid value for FZDTHRSD keyword: (set_compression_pref)");
ffpmsg(value);
return(*status = DATA_COMPRESSION_ERR);
}
}
/* set the desired dithering */
fits_set_dither_seed(outfptr, ivalue, status);
} else if (!strncmp(card+2, "I2F", 3) ) {
/* set whether to convert integers to float then use lossy compression */
if (!fits_strcasecmp(value, "t") ) {
fits_set_lossy_int (outfptr, 1, status);
} else if (!fits_strcasecmp(value, "f") ) {
fits_set_lossy_int (outfptr, 0, status);
} else {
ffpmsg("Unknown value for FZI2F keyword: (set_compression_pref)");
ffpmsg(value);
return(*status = DATA_COMPRESSION_ERR);
}
} else if (!strncmp(card+2, "HSCALE ", 6) ) {
/* set the desired Hcompress scale value */
hscale = (float) atof(value);
fits_set_hcomp_scale (outfptr, hscale, status);
}
}
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_get_noise_bits(fitsfile *fptr, /* I - FITS file pointer */
int *noisebits, /* noise_bits parameter value */
/* (default = 4) */
int *status) /* IO - error status */
{
/*
********************************************************************
********************************************************************
THIS ROUTINE IS PROVIDED ONLY FOR BACKWARDS COMPATIBILITY;
ALL NEW SOFTWARE SHOULD CALL fits_set_quantize_level INSTEAD
********************************************************************
********************************************************************
This routine returns the value of the noice_bits parameter that
should be used when compressing floating point images. The image is
divided into tiles, and each tile is compressed and stored in a row
of at variable length binary table column.
Feb 2008: code changed to use the more general "quantize level" parameter
rather than the "noise bits" parameter. If quantize level is greater than
zero, then the previous noisebits parameter is approximately given by
noise bits = natural logarithm (quantize level) / natural log (2)
This result is rounded to the nearest integer.
*/
double qlevel;
qlevel = (fptr->Fptr)->request_quantize_level;
if (qlevel > 0. && qlevel < 65537. )
*noisebits = (int) ((log(qlevel) / log(2.0)) + 0.5);
else
*noisebits = 0;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_get_quantize_level(fitsfile *fptr, /* I - FITS file pointer */
float *qlevel, /* quantize level parameter value */
int *status) /* IO - error status */
{
/*
This routine returns the value of the noice_bits parameter that
should be used when compressing floating point images. The image is
divided into tiles, and each tile is compressed and stored in a row
of at variable length binary table column.
*/
if ((fptr->Fptr)->request_quantize_level == NO_QUANTIZE) {
*qlevel = 0;
} else {
*qlevel = (fptr->Fptr)->request_quantize_level;
}
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_get_dither_seed(fitsfile *fptr, /* I - FITS file pointer */
int *offset, /* dithering offset parameter value */
int *status) /* IO - error status */
{
/*
This routine returns the value of the dithering offset parameter that
is used when compressing floating point images. The image is
divided into tiles, and each tile is compressed and stored in a row
of at variable length binary table column.
*/
*offset = (fptr->Fptr)->request_dither_seed;
return(*status);
}/*--------------------------------------------------------------------------*/
int fits_get_hcomp_scale(fitsfile *fptr, /* I - FITS file pointer */
float *scale, /* Hcompress scale parameter value */
int *status) /* IO - error status */
{
/*
This routine returns the value of the noice_bits parameter that
should be used when compressing floating point images. The image is
divided into tiles, and each tile is compressed and stored in a row
of at variable length binary table column.
*/
*scale = (fptr->Fptr)->request_hcomp_scale;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_get_hcomp_smooth(fitsfile *fptr, /* I - FITS file pointer */
int *smooth, /* Hcompress smooth parameter value */
int *status) /* IO - error status */
{
*smooth = (fptr->Fptr)->request_hcomp_smooth;
return(*status);
}
/*--------------------------------------------------------------------------*/
int fits_img_compress(fitsfile *infptr, /* pointer to image to be compressed */
fitsfile *outfptr, /* empty HDU for output compressed image */
int *status) /* IO - error status */
/*
This routine initializes the output table, copies all the keywords,
and loops through the input image, compressing the data and
writing the compressed tiles to the output table.
This is a high level routine that is called by the fpack and funpack
FITS compression utilities.
*/
{
int bitpix, naxis;
long naxes[MAX_COMPRESS_DIM];
/* int c1, c2, c3; */
if (*status > 0)
return(*status);
/* get datatype and size of input image */
if (fits_get_img_param(infptr, MAX_COMPRESS_DIM, &bitpix,
&naxis, naxes, status) > 0)
return(*status);
if (naxis < 1 || naxis > MAX_COMPRESS_DIM)
{
ffpmsg("Image cannot be compressed: NAXIS out of range");
return(*status = BAD_NAXIS);
}
/* create a new empty HDU in the output file now, before setting the */
/* compression preferences. This HDU will become a binary table that */
/* contains the compressed image. If necessary, create a dummy primary */
/* array, which much precede the binary table extension. */
ffcrhd(outfptr, status); /* this does nothing if the output file is empty */
if ((outfptr->Fptr)->curhdu == 0) /* have to create dummy primary array */
{
ffcrim(outfptr, 16, 0, NULL, status);
ffcrhd(outfptr, status);
} else {
/* unset any compress parameter preferences that may have been
set when closing the previous HDU in the output file */
fits_unset_compression_param(outfptr, status);
}
/* set any compress parameter preferences as given in the input file */
fits_set_compression_pref(infptr, outfptr, status);
/* special case: the quantization level is not given by a keyword in */
/* the HDU header, so we have to explicitly copy the requested value */
/* to the actual value */
/* do this in imcomp_get_compressed_image_par, instead
if ( (outfptr->Fptr)->request_quantize_level != 0.)
(outfptr->Fptr)->quantize_level = (outfptr->Fptr)->request_quantize_level;
*/
/* if requested, treat integer images same as a float image. */
/* Then the pixels will be quantized (lossy algorithm) to achieve */
/* higher amounts of compression than with lossless algorithms */
if ( (outfptr->Fptr)->request_lossy_int_compress != 0 && bitpix > 0)
bitpix = FLOAT_IMG; /* compress integer images as if float */
/* initialize output table */
if (imcomp_init_table(outfptr, bitpix, naxis, naxes, 0, status) > 0)
return (*status);
/* Copy the image header keywords to the table header. */
if (imcomp_copy_img2comp(infptr, outfptr, status) > 0)
return (*status);
/* turn off any intensity scaling (defined by BSCALE and BZERO */
/* keywords) so that unscaled values will be read by CFITSIO */
/* (except if quantizing an int image, same as a float image) */
if ( (outfptr->Fptr)->request_lossy_int_compress == 0 && bitpix > 0)
ffpscl(infptr, 1.0, 0.0, status);
/* force a rescan of the output file keywords, so that */
/* the compression parameters will be copied to the internal */
/* fitsfile structure used by CFITSIO */
ffrdef(outfptr, status);
/* turn off any intensity scaling (defined by BSCALE and BZERO */
/* keywords) so that unscaled values will be written by CFITSIO */
/* (except if quantizing an int image, same as a float image) */
if ( (outfptr->Fptr)->request_lossy_int_compress == 0 && bitpix > 0)
ffpscl(outfptr, 1.0, 0.0, status);
/* Read each image tile, compress, and write to a table row. */
imcomp_compress_image (infptr, outfptr, status);
/* force another rescan of the output file keywords, to */
/* update PCOUNT and TFORMn = '1PB(iii)' keyword values. */
ffrdef(outfptr, status);
/* unset any previously set compress parameter preferences */
fits_unset_compression_request(outfptr, status);
/*
fits_get_case(&c1, &c2, &c3);
printf("c1, c2, c3 = %d, %d, %d\n", c1, c2, c3);
*/
return (*status);
}
/*--------------------------------------------------------------------------*/
int imcomp_init_table(fitsfile *outfptr,
int inbitpix,
int naxis,
long *naxes,
int writebitpix, /* write the ZBITPIX, ZNAXIS, and ZNAXES keyword? */
int *status)
/*
create a BINTABLE extension for the output compressed image.
*/
{
char keyname[FLEN_KEYWORD], zcmptype[12];
int ii, remain, ndiv, addToDim, ncols, bitpix;
long nrows;
char *ttype[] = {"COMPRESSED_DATA", "ZSCALE", "ZZERO"};
char *tform[3];
char tf0[4], tf1[4], tf2[4];
char *tunit[] = {"\0", "\0", "\0" };
char comm[FLEN_COMMENT];
long actual_tilesize[MAX_COMPRESS_DIM]; /* Actual size to use for tiles */
int is_primary=0; /* Is this attempting to write to the primary? */
int nQualifyDims=0; /* For Hcompress, number of image dimensions with required pixels. */
int noHigherDims=1; /* Set to true if all tile dims other than x are size 1. */
int firstDim=-1, secondDim=-1; /* Indices of first and second tiles dimensions
with width > 1 */
if (*status > 0)
return(*status);
/* check for special case of losslessly compressing floating point */
/* images. Only compression algorithm that supports this is GZIP */
if ( (inbitpix < 0) && ((outfptr->Fptr)->request_quantize_level == NO_QUANTIZE) ) {
if (((outfptr->Fptr)->request_compress_type != GZIP_1) &&
((outfptr->Fptr)->request_compress_type != GZIP_2)) {
ffpmsg("Lossless compression of floating point images must use GZIP (imcomp_init_table)");
return(*status = DATA_COMPRESSION_ERR);
}
}
/* set default compression parameter values, if undefined */
if ( (outfptr->Fptr)->request_compress_type == 0) {
/* use RICE_1 by default */
(outfptr->Fptr)->request_compress_type = RICE_1;
}
if (inbitpix < 0 && (outfptr->Fptr)->request_quantize_level != NO_QUANTIZE) {
/* set defaults for quantizing floating point images */