1 files changed, 119 insertions, 0 deletions
diff --git a/fitsy++/hcompress.C b/fitsy++/hcompress.C
new file mode 100644
index 0000000..577ec47
--- /dev/null
+++ b/fitsy++/hcompress.C
@@ -0,0 +1,119 @@
+// 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;
+
+// Note: currently, hcompress will not work with float or double data with 
+// BLANK defined, due to the fact that the decompress code takes a int() and 
+// not an unsigned int()
+
+#include "hcompress.h"
+#include "util.h"
+
+extern "C" {
+  int fits_hdecompress(unsigned char *input, int smooth, int *a, int *ny, int *nx, int *scale, int *status);
+  int fits_hdecompress64(unsigned char *input, int smooth, long long *a, int *ny, int *nx, int *scale, int *status);
+}
+
+template<class T> FitsHcompressm<T>::FitsHcompressm(FitsFile* fits) 
+  : FitsCompressm<T>(fits)
+{
+  // hcompress parameters
+  smooth_ = 0;
+  char name[] = "ZNAME ";
+  char val[] = "ZVAL ";
+  for (int ii=0; ii<9; ii++) {
+    name[5] = '0'+ii;
+    val[4] = '0'+ii;
+    if (fits->find(name)) {
+      char* str = fits->getString(name);
+      if (!strncmp(str,"SMOOTH",4))
+	smooth_ = fits->getInteger(val,4);
+    }
+  }
+
+  FitsCompressm<T>::uncompress(fits);
+}
+
+template <class T> int FitsHcompressm<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_;
+  int nx,ny,scale;
+  int status=0;
+  int ll=0;
+
+  switch (FitsCompressm<T>::bitpix_) {
+  case 8:
+  case 16:
+    {
+      int* obuf = new int[ocnt];
+      if (fits_hdecompress(ibuf, smooth_, obuf, &nx, &ny, &scale, &status)) {
+	internalError("Fitsy++ hcompress bad inflate result");
+	return 0;
+      }
+      for (int kk=kkstart; kk<kkstop; kk++)
+	for (int jj=jjstart; jj<jjstop; jj++)
+	  for (int ii=iistart; ii<iistop; ii++,ll++)
+	    dest[kk*FitsCompressm<T>::width_*FitsCompressm<T>::height_ + jj*FitsCompressm<T>::width_ + ii] = FitsCompressm<T>::getValue(obuf+ll,zs,zz,blank);
+
+      if (obuf)
+	delete [] obuf;
+    }
+    break;
+  case 32:
+  case -32:
+  case -64:
+    {
+      long long* obuf = new long long[ocnt];
+      if (fits_hdecompress64(ibuf, smooth_, obuf, &nx, &ny, &scale, &status)) {
+	internalError("Fitsy++ hcompress bad inflate result");
+	return 0;
+      }
+      for (int kk=kkstart; kk<kkstop; kk++)
+	for (int jj=jjstart; jj<jjstop; jj++)
+	  for (int ii=iistart; ii<iistop; ii++,ll++)
+	    dest[kk*FitsCompressm<T>::width_*FitsCompressm<T>::height_ + jj*FitsCompressm<T>::width_ + ii] = FitsCompressm<T>::getValue((int*)obuf+ll,zs,zz,blank);
+
+      if (obuf)
+	delete [] obuf;
+    }
+    break;
+  }
+
+  return 1;
+}
+
+template class FitsHcompressm<unsigned char>;
+template class FitsHcompressm<short>;
+template class FitsHcompressm<unsigned short>;
+template class FitsHcompressm<int>;
+template class FitsHcompressm<long long>;
+template class FitsHcompressm<float>;
+template class FitsHcompressm<double>;