--- a/src/ov-bool-mat.cc
+++ b/src/ov-bool-mat.cc
@@ -44,6 +44,11 @@
 #include "ov-re-mat.h"
 #include "pr-output.h"
 
+#include "byte-swap.h"
+#include "ls-oct-ascii.h"
+#include "ls-hdf5.h"
+#include "ls-utils.h"
+
 template class octave_base_matrix<boolNDArray>;
 
 DEFINE_OCTAVE_ALLOCATOR (octave_bool_matrix);
@@ -148,6 +153,289 @@
 			 current_print_indent_level ());
 }
 
+bool 
+octave_bool_matrix::save_ascii (std::ostream& os, bool& /* infnan_warned */,
+				bool /* strip_nan_and_inf */)
+{
+  dim_vector d = dims ();
+  if (d.length () > 2)
+    {
+      NDArray tmp = array_value ();
+      os << "# ndims: " << d.length () << "\n";
+
+      for (int i=0; i < d.length (); i++)
+	os << " " << d (i);
+
+      os << "\n" << tmp;
+    }
+  else
+    {
+      // Keep this case, rather than use generic code above for backward 
+      // compatiability. Makes load_ascii much more complex!!
+      os << "# rows: " << rows () << "\n"
+	 << "# columns: " << columns () << "\n";
+
+      Matrix tmp = matrix_value ();
+
+      os << tmp;
+    }
+
+  return true;
+}
+
+bool 
+octave_bool_matrix::load_ascii (std::istream& is)
+{
+  int mdims = 0;
+  bool success = true;
+  std::streampos pos = is.tellg ();
+
+  if (extract_keyword (is, "ndims", mdims, true))
+    {
+      if (mdims >= 0)
+	{
+	  dim_vector dv;
+	  dv.resize (mdims);
+
+	  for (int i = 0; i < mdims; i++)
+	    is >> dv(i);
+
+	  NDArray tmp(dv);
+	  is >> tmp;
+
+	  if (!is) 
+	    {
+	      error ("load: failed to load matrix constant");
+	      success = false;
+	    }
+
+	  boolNDArray btmp (dv);
+	  for (int i = 0; i < btmp.nelem (); i++)
+	      btmp.elem (i) = (tmp.elem (i) != 0.);
+	  
+	  matrix = btmp;
+	}
+      else
+	{
+	  error ("load: failed to extract number of rows and columns");
+	  success = false;
+	}
+    }
+  else
+    {
+      int nr = 0;
+      int nc = 0;
+
+      // re-read the same line again
+      is.clear ();
+      is.seekg (pos);
+
+      if (extract_keyword (is, "rows", nr) && nr >= 0
+	  && extract_keyword (is, "columns", nc) && nc >= 0)
+	{
+	  if (nr > 0 && nc > 0)
+	    {
+	      Matrix tmp (nr, nc);
+	      is >> tmp;
+	      if (!is) 
+		{
+		  error ("load: failed to load matrix constant");
+		  success = false;
+		}
+
+	      boolMatrix btmp (nr,nc);
+	      for (int j = 0; j < nc; j++)
+		for (int i = 0; i < nr; i++)
+		  btmp.elem (i,j) = (tmp.elem (i, j) != 0.);
+	      
+	      matrix = btmp;
+	    }
+	  else if (nr == 0 || nc == 0)
+	    matrix = boolMatrix (nr, nc);
+	  else
+	    panic_impossible ();
+	}
+      else 
+	{
+	  error ("load: failed to extract number of rows and columns");
+	  success = false;
+	}
+    }
+
+  return success;
+}
+
+bool 
+octave_bool_matrix::save_binary (std::ostream& os, bool& /* save_as_floats */)
+{
+
+  dim_vector d = dims ();
+  if (d.length() < 1)
+    return false;
+
+  // Use negative value for ndims to differentiate with old format!!
+  FOUR_BYTE_INT tmp = - d.length();
+  os.write (X_CAST (char *, &tmp), 4);
+  for (int i=0; i < d.length (); i++)
+    {
+      tmp = d(i);
+      os.write (X_CAST (char *, &tmp), 4);
+    }
+
+  boolNDArray m = bool_array_value ();
+  bool *mtmp = m.fortran_vec ();
+  int nel = m.nelem ();
+  OCTAVE_LOCAL_BUFFER (char, htmp, nel);
+
+  for (int i = 0; i < nel; i++)
+    htmp[i] = (mtmp[i] ? 1 : 0);
+
+  os.write (htmp, nel);
+
+  return true;
+}
+
+bool 
+octave_bool_matrix::load_binary (std::istream& is, bool swap,
+				 oct_mach_info::float_format /* fmt */)
+{
+  FOUR_BYTE_INT mdims;
+  if (! is.read (X_CAST (char *, &mdims), 4))
+    return false;
+  if (swap)
+    swap_4_bytes (X_CAST (char *, &mdims));
+  if (mdims >= 0)
+    return false;
+
+  // mdims is negative for consistency with other matrices, where it is
+  // negative to allow the positive value to be used for rows/cols for
+  // backward compatibility
+  mdims = - mdims;
+  FOUR_BYTE_INT di;
+  dim_vector dv;
+  dv.resize (mdims);
+
+  for (int i = 0; i < mdims; i++)
+    {
+      if (! is.read (X_CAST (char *, &di), 4))
+	return false;
+      if (swap)
+	swap_4_bytes (X_CAST (char *, &di));
+      dv(i) = di;
+    }
+  
+  int nel = dv.numel ();
+  OCTAVE_LOCAL_BUFFER (char, htmp, nel);
+  if (! is.read (htmp, nel))
+    return false;
+  boolNDArray m(dv);
+  bool *mtmp = m.fortran_vec ();
+  for (int i = 0; i < nel; i++)
+    mtmp[i] = (htmp[i] ? 1 : 0);
+  matrix = m;
+
+  return true;
+}
+
+#if defined (HAVE_HDF5)
+bool
+octave_bool_matrix::save_hdf5 (hid_t loc_id, const char *name,
+			       bool /* save_as_floats */)
+{
+  dim_vector d = dims ();
+  hsize_t hdims[d.length () > 2 ? d.length () : 3];
+  hid_t space_hid = -1, data_hid = -1;
+  int rank = ( (d (0) == 1) && (d.length () == 2) ? 1 : d.length ());
+  bool retval = true;
+
+  boolNDArray m = bool_array_value ();
+
+  // Octave uses column-major, while HDF5 uses row-major ordering
+  for (int i = 0, j = d.length() - 1; i < d.length (); i++, j--)
+    hdims[i] = d (j);
+
+  space_hid = H5Screate_simple (rank, hdims, (hsize_t*) 0);
+  if (space_hid < 0) return false;
+
+  data_hid = H5Dcreate (loc_id, name, H5T_NATIVE_HBOOL, space_hid, 
+			H5P_DEFAULT);
+  if (data_hid < 0)
+    {
+      H5Sclose (space_hid);
+      return false;
+    }
+
+  int nel = m.nelem ();
+  bool *mtmp = m.fortran_vec ();
+  hbool_t htmp[nel];
+  
+  for (int i = 0; i < nel; i++)
+    htmp[i] = mtmp[i];
+
+  retval = H5Dwrite (data_hid, H5T_NATIVE_HBOOL, H5S_ALL, H5S_ALL,
+		     H5P_DEFAULT, (void*) htmp) >= 0;
+
+  H5Dclose (data_hid);
+  H5Sclose (space_hid);
+  return retval;
+}
+
+bool
+octave_bool_matrix::load_hdf5 (hid_t loc_id, const char *name,
+			       bool /* have_h5giterate_bug */)
+{
+  bool retval = false;
+  hid_t data_hid = H5Dopen (loc_id, name);
+  hid_t space_id = H5Dget_space (data_hid);
+
+  hsize_t rank = H5Sget_simple_extent_ndims (space_id);
+  
+  if (rank < 1)
+    {
+      H5Dclose (data_hid);
+      return false;
+    }
+
+  OCTAVE_LOCAL_BUFFER (hsize_t, hdims, rank);
+  OCTAVE_LOCAL_BUFFER (hsize_t, maxdims, rank);
+
+  H5Sget_simple_extent_dims (space_id, hdims, maxdims);
+
+  dim_vector dv;
+
+  // Octave uses column-major, while HDF5 uses row-major ordering
+  if (rank == 1)
+    {
+      dv.resize (2);
+      dv(0) = 1;
+      dv(1) = hdims[0];
+    }
+  else
+    {
+      dv.resize (rank);
+      for (int i = 0, j = rank - 1; i < (int)rank; i++, j--)
+	dv(j) = hdims[i];
+    }
+
+  int nel = dv.numel ();
+  hbool_t htmp[nel];
+  if (H5Dread (data_hid, H5T_NATIVE_HBOOL, H5S_ALL, H5S_ALL, 
+	       H5P_DEFAULT, (void *) htmp) >= 0) 
+    {
+      retval = true;
+
+      boolNDArray btmp (dv);
+      for (int i = 0; i < nel; i++)
+	  btmp.elem (i) = htmp[i];
+
+      matrix = btmp;
+    }
+
+  H5Dclose (data_hid);
+  return retval;
+}
+#endif
+
 /*
 ;;; Local Variables: ***
 ;;; mode: C++ ***