new file mode 100644
--- /dev/null
+++ b/liboctave/data-conv.cc
@@ -0,0 +1,641 @@
+// data-conv.cc                                           -*- C++ -*-
+/*
+
+Copyright (C) 1996 John W. Eaton
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <iostream.h>
+
+#include "byte-swap.h"
+#include "data-conv.h"
+#include "lo-error.h"
+
+#define swap_1_bytes(x, y)
+
+#define LS_DO_READ(TYPE,swap,data,size,len,stream) \
+  do \
+    { \
+      volatile TYPE *ptr = (TYPE *) data; \
+      stream.read ((TYPE *) ptr, size * len); \
+      if (swap) \
+        swap_ ## size ## _bytes ((char *) ptr, len); \
+      TYPE tmp = ptr[0]; \
+      for (int i = len - 1; i > 0; i--) \
+        data[i] = ptr[i]; \
+      data[0] = tmp; \
+    } \
+  while (0)
+
+// Have to use copy here to avoid writing over data accessed via
+// Matrix::data().
+
+#define LS_DO_WRITE(TYPE,data,size,len,stream) \
+  do \
+    { \
+      char tmp_type = (char) type; \
+      stream.write (&tmp_type, 1); \
+      TYPE *ptr = new TYPE [len]; \
+      for (int i = 0; i < len; i++) \
+        ptr[i] = (TYPE) data[i]; \
+      stream.write ((TYPE *) ptr, size * len); \
+      delete [] ptr ; \
+    } \
+  while (0)
+
+// Loading variables from files.
+
+static void
+gripe_unrecognized_float_fmt (void)
+{
+  (*current_liboctave_error_handler)
+    ("unrecognized floating point format requested");
+}
+
+static void
+gripe_data_conversion (const char *from, const char *to)
+{
+  (*current_liboctave_error_handler)
+    ("unable to convert from %s to %s format", from, to);
+}
+
+// But first, some data conversion routines.
+
+// Currently, we only handle conversions for the IEEE types.  To fix
+// that, make more of the following routines work.
+
+// XXX FIXME XXX -- assumes sizeof (Complex) == 8
+// XXX FIXME XXX -- assumes sizeof (double) == 8
+// XXX FIXME XXX -- assumes sizeof (float) == 4
+
+static void
+IEEE_big_double_to_IEEE_little_double (double *d, int len)
+{
+  swap_8_bytes ((char *) d, len);
+}
+
+static void
+VAX_D_double_to_IEEE_little_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX D float", "IEEE little endian format");
+}
+
+static void
+VAX_G_double_to_IEEE_little_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "IEEE little endian format");
+}
+
+static void
+Cray_to_IEEE_little_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("Cray", "IEEE little endian format");
+}
+
+static void
+IEEE_big_float_to_IEEE_little_float (float *d, int len)
+{
+  swap_4_bytes ((char *) d, len);
+}
+
+static void
+VAX_D_float_to_IEEE_little_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX D float", "IEEE little endian format");
+}
+
+static void
+VAX_G_float_to_IEEE_little_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "IEEE little endian format");
+}
+
+static void
+Cray_to_IEEE_little_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("Cray", "IEEE little endian format");
+}
+
+static void
+IEEE_little_double_to_IEEE_big_double (double *d, int len)
+{
+  swap_8_bytes ((char *) d, len);
+}
+
+static void
+VAX_D_double_to_IEEE_big_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX D float", "IEEE big endian format");
+}
+
+static void
+VAX_G_double_to_IEEE_big_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "IEEE big endian format");
+}
+
+static void
+Cray_to_IEEE_big_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("Cray", "IEEE big endian format");
+}
+
+static void
+IEEE_little_float_to_IEEE_big_float (float *d, int len)
+{
+  swap_4_bytes ((char *) d, len);
+}
+
+static void
+VAX_D_float_to_IEEE_big_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX D float", "IEEE big endian format");
+}
+
+static void
+VAX_G_float_to_IEEE_big_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "IEEE big endian format");
+}
+
+static void
+Cray_to_IEEE_big_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("Cray", "IEEE big endian format");
+}
+
+static void
+IEEE_little_double_to_VAX_D_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE little endian", "VAX D");
+}
+
+static void
+IEEE_big_double_to_VAX_D_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE big endian", "VAX D");
+}
+
+static void
+VAX_G_double_to_VAX_D_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "VAX D");
+}
+
+static void
+Cray_to_VAX_D_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("Cray", "VAX D");
+}
+
+static void
+IEEE_little_float_to_VAX_D_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE little endian", "VAX D");
+}
+
+static void
+IEEE_big_float_to_VAX_D_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE big endian", "VAX D");
+}
+
+static void
+VAX_G_float_to_VAX_D_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "VAX D");
+}
+
+static void
+Cray_to_VAX_D_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("Cray", "VAX D");
+}
+
+static void
+IEEE_little_double_to_VAX_G_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE little endian", "VAX G");
+}
+
+static void
+IEEE_big_double_to_VAX_G_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE big endian", "VAX G");
+}
+
+static void
+VAX_D_double_to_VAX_G_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX D float", "VAX G");
+}
+
+static void
+Cray_to_VAX_G_double (double * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "VAX G");
+}
+
+static void
+IEEE_little_float_to_VAX_G_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE little endian", "VAX G");
+}
+
+static void
+IEEE_big_float_to_VAX_G_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("IEEE big endian", "VAX G");
+}
+
+static void
+VAX_D_float_to_VAX_G_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX D float", "VAX G");
+}
+
+static void
+Cray_to_VAX_G_float (float * /* d */, int /* len */)
+{
+  gripe_data_conversion ("VAX G float", "VAX G");
+}
+
+void
+do_double_format_conversion (double *data, int len,
+			     floating_point_format fmt)
+{
+  switch (native_float_format)
+    {
+    case OCTAVE_IEEE_LITTLE:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  IEEE_big_double_to_IEEE_little_double (data, len);
+	  break;
+
+	case OCTAVE_VAX_D:
+	  VAX_D_double_to_IEEE_little_double (data, len);
+	  break;
+
+	case OCTAVE_VAX_G:
+	  VAX_G_double_to_IEEE_little_double (data, len);
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_IEEE_little_double (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    case OCTAVE_IEEE_BIG:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  IEEE_little_double_to_IEEE_big_double (data, len);
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  break;
+
+	case OCTAVE_VAX_D:
+	  VAX_D_double_to_IEEE_big_double (data, len);
+	  break;
+
+	case OCTAVE_VAX_G:
+	  VAX_G_double_to_IEEE_big_double (data, len);
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_IEEE_big_double (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    case OCTAVE_VAX_D:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  IEEE_little_double_to_VAX_D_double (data, len);
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  IEEE_big_double_to_VAX_D_double (data, len);
+	  break;
+
+	case OCTAVE_VAX_D:
+	  break;
+
+	case OCTAVE_VAX_G:
+	  VAX_G_double_to_VAX_D_double (data, len);
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_VAX_D_double (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    case OCTAVE_VAX_G:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  IEEE_little_double_to_VAX_G_double (data, len);
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  IEEE_big_double_to_VAX_G_double (data, len);
+	  break;
+
+	case OCTAVE_VAX_D:
+	  VAX_D_double_to_VAX_G_double (data, len);
+	  break;
+
+	case OCTAVE_VAX_G:
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_VAX_G_double (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    default:
+      (*current_liboctave_error_handler)
+	("impossible state reached in file `%s' at line %d",
+	 __FILE__, __LINE__);
+      break;
+    }
+}
+
+void
+do_float_format_conversion (float *data, int len,
+			    floating_point_format fmt)
+{
+  switch (native_float_format)
+    {
+    case OCTAVE_IEEE_LITTLE:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  IEEE_big_float_to_IEEE_little_float (data, len);
+	  break;
+
+	case OCTAVE_VAX_D:
+	  VAX_D_float_to_IEEE_little_float (data, len);
+	  break;
+
+	case OCTAVE_VAX_G:
+	  VAX_G_float_to_IEEE_little_float (data, len);
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_IEEE_little_float (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    case OCTAVE_IEEE_BIG:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  IEEE_little_float_to_IEEE_big_float (data, len);
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  break;
+
+	case OCTAVE_VAX_D:
+	  VAX_D_float_to_IEEE_big_float (data, len);
+	  break;
+
+	case OCTAVE_VAX_G:
+	  VAX_G_float_to_IEEE_big_float (data, len);
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_IEEE_big_float (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    case OCTAVE_VAX_D:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  IEEE_little_float_to_VAX_D_float (data, len);
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  IEEE_big_float_to_VAX_D_float (data, len);
+	  break;
+
+	case OCTAVE_VAX_D:
+	  break;
+
+	case OCTAVE_VAX_G:
+	  VAX_G_float_to_VAX_D_float (data, len);
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_VAX_D_float (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    case OCTAVE_VAX_G:
+      switch (fmt)
+	{
+	case OCTAVE_IEEE_LITTLE:
+	  IEEE_little_float_to_VAX_G_float (data, len);
+	  break;
+
+	case OCTAVE_IEEE_BIG:
+	  IEEE_big_float_to_VAX_G_float (data, len);
+	  break;
+
+	case OCTAVE_VAX_D:
+	  VAX_D_float_to_VAX_G_float (data, len);
+	  break;
+
+	case OCTAVE_VAX_G:
+	  break;
+
+	case OCTAVE_CRAY:
+	  Cray_to_VAX_G_float (data, len);
+	  break;
+
+	default:
+	  gripe_unrecognized_float_fmt ();
+	  break;
+	}
+      break;
+
+    default:
+      (*current_liboctave_error_handler)
+	("impossible state reached in file `%s' at line %d",
+	 __FILE__, __LINE__);
+      break;
+    }
+}
+
+void
+read_doubles (istream& is, double *data, save_type type, int len,
+	      int swap, floating_point_format fmt)
+{
+  switch (type)
+    {
+    case LS_U_CHAR:
+      LS_DO_READ (unsigned char, swap, data, 1, len, is);
+      break;
+
+    case LS_U_SHORT:
+      LS_DO_READ (unsigned TWO_BYTE_INT, swap, data, 2, len, is);
+      break;
+
+    case LS_U_INT:
+      LS_DO_READ (unsigned FOUR_BYTE_INT, swap, data, 4, len, is);
+      break;
+
+    case LS_CHAR:
+      LS_DO_READ (signed char, swap, data, 1, len, is);
+      break;
+
+    case LS_SHORT:
+      LS_DO_READ (TWO_BYTE_INT, swap, data, 2, len, is);
+      break;
+
+    case LS_INT:
+      LS_DO_READ (FOUR_BYTE_INT, swap, data, 4, len, is);
+      break;
+
+    case LS_FLOAT:
+      {
+	volatile float *ptr = (float *) data;
+	is.read (data, 4 * len);
+	do_float_format_conversion ((float *) data, len, fmt);
+	float tmp = ptr[0];
+	for (int i = len - 1; i > 0; i--)
+	  data[i] = ptr[i];
+	data[0] = tmp;
+      }
+      break;
+
+    case LS_DOUBLE:
+      is.read (data, 8 * len);
+      do_double_format_conversion (data, len, fmt);
+      break;
+
+    default:
+      is.clear (ios::failbit|is.rdstate ());
+      break;
+    }
+}
+
+void
+write_doubles (ostream& os, const double *data, save_type type, int len)
+{
+  switch (type)
+    {
+    case LS_U_CHAR:
+      LS_DO_WRITE (unsigned char, data, 1, len, os);
+      break;
+
+    case LS_U_SHORT:
+      LS_DO_WRITE (unsigned TWO_BYTE_INT, data, 2, len, os);
+      break;
+
+    case LS_U_INT:
+      LS_DO_WRITE (unsigned FOUR_BYTE_INT, data, 4, len, os);
+      break;
+
+    case LS_CHAR:
+      LS_DO_WRITE (signed char, data, 1, len, os);
+      break;
+
+    case LS_SHORT:
+      LS_DO_WRITE (TWO_BYTE_INT, data, 2, len, os);
+      break;
+
+    case LS_INT:
+      LS_DO_WRITE (FOUR_BYTE_INT, data, 4, len, os);
+      break;
+
+    case LS_FLOAT:
+      LS_DO_WRITE (float, data, 4, len, os);
+      break;
+
+    case LS_DOUBLE:
+      {
+	char tmp_type = (char) type;
+	os.write (&tmp_type, 1);
+	os.write (data, 8 * len);
+      }
+      break;
+
+    default:
+      (*current_liboctave_error_handler)
+	("unrecognized data format requested");
+      break;
+    }
+}
+
+/*
+;;; Local Variables: ***
+;;; mode: C++ ***
+;;; page-delimiter: "^/\\*" ***
+;;; End: ***
+*/