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// Copyright (C) 1999-2018
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"
#include <iostream>
#include <sstream>
#include <iomanip>
using namespace std;
#include "gzip.h"
#include "zlib.h"
#include "util.h"
template<class T> FitsGzipm<T>::FitsGzipm(FitsFile* fits)
: FitsCompressm<T>(fits)
{
FitsCompressm<T>::uncompress(fits);
}
template <class T> int FitsGzipm<T>::compressed(T* dest, char* sptr,
char* heap,
int kkstart, int kkstop,
int jjstart, int jjstop,
int iistart, int iistop)
{
double zs = FitsCompressm<T>::bscale_;
if (FitsCompressm<T>::zscale_)
zs = FitsCompressm<T>::zscale_->value(sptr,0);
double zz = FitsCompressm<T>::bzero_;
if (FitsCompressm<T>::zzero_)
zz = FitsCompressm<T>::zzero_->value(sptr,0);
int blank = FitsCompressm<T>::blank_;
if (FitsCompressm<T>::zblank_)
blank = (int)FitsCompressm<T>::zblank_->value(sptr,0);
int icnt=0;
unsigned char* ibuf = (unsigned char*)((FitsBinColumnArray*)FitsCompressm<T>::compress_)->get(heap, sptr, &icnt);
// ibuf can be NULL
if (!ibuf || !icnt)
return 0;
int ocnt = FitsCompressm<T>::tilesize_;
char* obuf = new char[ocnt*sizeof(long long)];
if (!obuf) {
internalError("Fitsy++ gzip unable to alloc.");
return 0;
}
z_stream zstrm;
zstrm.next_in = NULL;
zstrm.avail_in = 0;
zstrm.zalloc = NULL;
zstrm.zfree = NULL;
zstrm.opaque = NULL;
// look for both zlib and gzip headers
if (inflateInit2(&zstrm, MAX_WBITS+32) != Z_OK) {
internalError("Fitsy++ gzip inflateInit error");
if (obuf)
delete [] obuf;
return 0;
}
zstrm.avail_in = icnt;
zstrm.next_in = ibuf;
zstrm.avail_out = ocnt*sizeof(long long);
zstrm.next_out = (Bytef*)obuf;
if (DebugCompress)
cerr << " inflate START: avail_in " << zstrm.avail_in
<< " avail_out " << zstrm.avail_out
<< " total_in " << zstrm.total_in
<< " total_out " << zstrm.total_out << endl;
int result = ::inflate(&zstrm, Z_FINISH);
switch (result) {
case Z_OK:
if (DebugCompress)
cerr << " inflate OK: avail_in " << zstrm.avail_in
<< " avail_out " << zstrm.avail_out
<< " total_in " << zstrm.total_in
<< " total_out " << zstrm.total_out << endl;
break;
case Z_STREAM_END:
if (DebugCompress)
cerr << " inflate STREAM_END: avail_in " << zstrm.avail_in
<< " avail_out " << zstrm.avail_out
<< " total_in " << zstrm.total_in
<< " total_out " << zstrm.total_out << endl;
break;
case Z_BUF_ERROR:
if (DebugCompress)
cerr << " inflate BUF_ERROR: avail_in " << zstrm.avail_in
<< " avail_out " << zstrm.avail_out << endl;
if (obuf)
delete [] obuf;
return 0;
default:
internalError("Fitsy++ gzip inflate error");
if (obuf)
delete [] obuf;
return 0;
}
int bytepix = zstrm.total_out/FitsCompressm<T>::tilesize_;
inflateEnd(&zstrm);
// GZIP_2- unshuffle if needed
if (!strncmp(FitsCompressm<T>::type_,"GZIP_2",6)) {
switch (bytepix) {
case 1:
break;
case 2:
{
int ll = ocnt*sizeof(short);
char* nbuf = new char[ll];
if (!nbuf) {
internalError("Fitsy++ gzip unable to alloc.");
if (obuf)
delete [] obuf;
return 0;
}
char* optr = obuf+ll-1;
char* nptr = nbuf+ll-1;
for (int ii=0; ii<ocnt; ii++) {
*nptr = *optr;
nptr--;
*nptr = *(optr-ocnt);
nptr--;
optr--;
}
memcpy(obuf,nbuf,ll);
delete [] nbuf;
}
break;
case 4:
{
int ll = ocnt*sizeof(int);
char* nbuf = new char[ll];
if (!nbuf) {
internalError("Fitsy++ gzip unable to alloc.");
if (obuf)
delete [] obuf;
return 0;
}
char* optr = obuf+ll-1;
char* nptr = nbuf+ll-1;
for (int ii=0; ii<ocnt; ii++) {
*nptr = *optr;
nptr--;
*nptr = *(optr-ocnt);
nptr--;
*nptr = *(optr-(2*ocnt));
nptr--;
*nptr = *(optr-(3*ocnt));
nptr--;
optr--;
}
memcpy(obuf,nbuf,ll);
delete [] nbuf;
}
break;
case 8:
{
int ll = ocnt*sizeof(long long);
char* nbuf = new char[ll];
if (!nbuf) {
internalError("Fitsy++ gzip unable to alloc.");
if (obuf)
delete [] obuf;
return 0;
}
char* optr = obuf+ll-1;
char* nptr = nbuf+ll-1;
for (int ii=0; ii<ocnt; ii++) {
*nptr = *optr;
nptr--;
*nptr = *(optr-ocnt);
nptr--;
*nptr = *(optr-(2*ocnt));
nptr--;
*nptr = *(optr-(3*ocnt));
nptr--;
*nptr = *(optr-(4*ocnt));
nptr--;
*nptr = *(optr-(5*ocnt));
nptr--;
*nptr = *(optr-(6*ocnt));
nptr--;
*nptr = *(optr-(7*ocnt));
nptr--;
optr--;
}
memcpy(obuf,nbuf,ll);
delete [] nbuf;
}
break;
}
}
int ll=0;
switch (bytepix) {
case 1:
for (int kk=kkstart; kk<kkstop; kk++)
for (int jj=jjstart; jj<jjstop; jj++)
for (int ii=iistart; ii<iistop; ii++,ll++) {
size_t id = kk*FitsCompressm<T>::width_*FitsCompressm<T>::height_ + jj*FitsCompressm<T>::width_ + ii;
// very carefull about type conversions
T val = FitsCompressm<T>::getValue(obuf+ll,zs,zz,blank);
dest[id] = val;
}
break;
case 2:
for (int kk=kkstart; kk<kkstop; kk++)
for (int jj=jjstart; jj<jjstop; jj++)
for (int ii=iistart; ii<iistop; ii++,ll++) {
// swap if needed
if (FitsCompressm<T>::byteswap_) {
const char* p = (const char*)((short*)obuf+ll);
union {
char c[2];
short s;
} u;
u.c[1] = *p++;
u.c[0] = *p;
*((short*)obuf+ll) = u.s;
}
// very carefull about type conversions
size_t id = kk*FitsCompressm<T>::width_*FitsCompressm<T>::height_ + jj*FitsCompressm<T>::width_ + ii;
T val = FitsCompressm<T>::getValue((short*)obuf+ll,zs,zz,blank);
dest[id] = val;
}
break;
case 4:
for (int kk=kkstart; kk<kkstop; kk++)
for (int jj=jjstart; jj<jjstop; jj++)
for (int ii=iistart; ii<iistop; ii++,ll++) {
// swap if needed
if (FitsCompressm<T>::byteswap_) {
const char* p = (const char*)((int*)obuf+ll);
union {
char c[4];
int i;
} u;
u.c[3] = *p++;
u.c[2] = *p++;
u.c[1] = *p++;
u.c[0] = *p;
*((int*)obuf+ll) = u.i;
}
// very carefull about type conversions
size_t id = kk*FitsCompressm<T>::width_*FitsCompressm<T>::height_ + jj*FitsCompressm<T>::width_ + ii;
T val =0;
switch (FitsCompressm<T>::quantize_) {
case FitsCompress::NONE:
val = FitsCompressm<T>::getValue((float*)obuf+ll,zs,zz,blank);
break;
case FitsCompress::NODITHER:
case FitsCompress::SUBDITHER1:
case FitsCompress::SUBDITHER2:
val = FitsCompressm<T>::getValue((int*)obuf+ll,zs,zz,blank);
break;
}
dest[id] = val;
}
break;
case 8:
for (int kk=kkstart; kk<kkstop; kk++)
for (int jj=jjstart; jj<jjstop; jj++)
for (int ii=iistart; ii<iistop; ii++,ll++) {
// swap if needed
if (FitsCompressm<T>::byteswap_) {
const char* p = (const char*)((long long*)obuf+ll);
union {
char c[8];
long long i;
} u;
u.c[7] = *p++;
u.c[6] = *p++;
u.c[5] = *p++;
u.c[4] = *p++;
u.c[3] = *p++;
u.c[2] = *p++;
u.c[1] = *p++;
u.c[0] = *p;
*((long long*)obuf+ll) = u.i;
}
// very carefull about type conversions
size_t id = kk*FitsCompressm<T>::width_*FitsCompressm<T>::height_ + jj*FitsCompressm<T>::width_ + ii;
T val =0;
switch (FitsCompressm<T>::quantize_) {
case FitsCompress::NONE:
val = FitsCompressm<T>::getValue((double*)obuf+ll,zs,zz,blank);
break;
case FitsCompress::NODITHER:
case FitsCompress::SUBDITHER1:
case FitsCompress::SUBDITHER2:
val = FitsCompressm<T>::getValue((long long*)obuf+ll,zs,zz,blank);
break;
}
dest[id] = val;
}
break;
default:
internalError("Fitsy++ gzip illegal bytepix");
if (obuf)
delete [] obuf;
return 0;
}
if (obuf)
delete [] obuf;
return 1;
}
template class FitsGzipm<unsigned char>;
template class FitsGzipm<short>;
template class FitsGzipm<unsigned short>;
template class FitsGzipm<int>;
template class FitsGzipm<long long>;
template class FitsGzipm<float>;
template class FitsGzipm<double>;
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