+/*****************************************************************************
+** Name: src/common/extended.c
+** Purpose: IEEE Extended<->Double routines to save floats to file
+** Maintainer: Ryan Norton
+** Modified by:
+** Created: 11/24/04
+** RCS-ID: $Id$
+*****************************************************************************/
+
+
+#if defined(_WIN32_WCE)
+ /* eVC cause warnings in its own headers: stdlib.h and winnt.h */
+ #pragma warning (disable:4115)
+ #pragma warning (disable:4214)
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <limits.h>
+#include <string.h>
#include "wx/defs.h"
-#include <math.h>
+#if defined(_WIN32_WCE)
+ #pragma warning (default:4115)
+ #pragma warning (default:4214)
+#endif
#if wxUSE_APPLE_IEEE
-/*
- * C O N V E R T T O I E E E E X T E N D E D
- */
+#include "wx/math.h"
-/* Copyright (C) 1988-1991 Apple Computer, Inc.
+/* Copyright (C) 1989-1991 Ken Turkowski. <turk@computer.org>
+ *
* All rights reserved.
*
+ * Warranty Information
+ * Even though I have reviewed this software, I make no warranty
+ * or representation, either express or implied, with respect to this
+ * software, its quality, accuracy, merchantability, or fitness for a
+ * particular purpose. As a result, this software is provided "as is,"
+ * and you, its user, are assuming the entire risk as to its quality
+ * and accuracy.
+ *
+ * This code may be used and freely distributed as long as it includes
+ * this copyright notice and the above warranty information.
+ *
* Machine-independent I/O routines for IEEE floating-point numbers.
*
* NaN's and infinities are converted to HUGE_VAL or HUGE, which
- * happens to be infinity on IEEE machines. Unfortunately, it is
+ * happens to be infinity on IEEE machines. Unfortunately, it is
* impossible to preserve NaN's in a machine-independent way.
* Infinities are, however, preserved on IEEE machines.
*
* Silicon Graphics IRIS, MIPS compiler
* Cray X/MP and Y/MP
* Digital Equipment VAX
+ * Sequent Balance (Multiprocesor 386)
+ * NeXT
*
*
* Implemented by Malcolm Slaney and Ken Turkowski.
*/
#ifndef HUGE_VAL
-#define HUGE_VAL HUGE
+# define HUGE_VAL HUGE
#endif /*HUGE_VAL*/
-#define FloatToUnsigned(f) ((unsigned long) (((long) (f - 2147483648.0)) + 2147483647L) + 1)
-
-void ConvertToIeeeExtended(double num, unsigned char *bytes)
-{
- int sign;
- int expon;
- double fMant, fsMant;
- unsigned long hiMant, loMant;
- if (num < 0) {
- sign = 0x8000;
- num *= -1;
- } else {
- sign = 0;
- }
+/****************************************************************
+ * The following two routines make up for deficiencies in many
+ * compilers to convert properly between unsigned integers and
+ * floating-point. Some compilers which have this bug are the
+ * THINK_C compiler for the Macintosh and the C compiler for the
+ * Silicon Graphics MIPS-based Iris.
+ ****************************************************************/
- if (num == 0) {
- expon = 0; hiMant = 0; loMant = 0;
- }
- else {
- fMant = frexp(num, &expon);
- if ((expon > 16384) || !(fMant < 1)) { /* Infinity or NaN */
- expon = sign|0x7FFF; hiMant = 0; loMant = 0; /* infinity */
- }
- else { /* Finite */
- expon += 16382;
- if (expon < 0) { /* denormalized */
- fMant = ldexp(fMant, expon);
- expon = 0;
- }
- expon |= sign;
- fMant = ldexp(fMant, 32);
- fsMant = floor(fMant);
- hiMant = FloatToUnsigned(fsMant);
- fMant = ldexp(fMant - fsMant, 32);
- fsMant = floor(fMant);
- loMant = FloatToUnsigned(fsMant);
- }
- }
+#ifdef applec /* The Apple C compiler works */
+# define FloatToUnsigned(f) ((wxUint32)(f))
+# define UnsignedToFloat(u) ((wxFloat64)(u))
+#else /*applec*/
+# define FloatToUnsigned(f) ((wxUint32)(((wxInt32)((f) - 2147483648.0)) + 2147483647L) + 1)
+# define UnsignedToFloat(u) (((wxFloat64)((wxInt32)((u) - 2147483647L - 1))) + 2147483648.0)
+#endif /*applec*/
- /* disable the warning about 'possible loss of data' & 'conversion between
- * diff types' */
-#ifdef _MSC_VER
-#pragma warning(disable: 4244)
-#pragma warning(disable: 4135)
-#endif /* Visual C++ */
-
- bytes[0] = (expon >> 8) & 0xff;
- bytes[1] = expon & 0xff;
- bytes[2] = (unsigned char) ((hiMant >> 24) & 0xff);
- bytes[3] = (unsigned char) ((hiMant >> 16) & 0xff);
- bytes[4] = (unsigned char) ((hiMant >> 8) & 0xff);
- bytes[5] = (unsigned char) (hiMant & 0xff);
- bytes[6] = (unsigned char) ((loMant >> 24) & 0xff);
- bytes[7] = (unsigned char) ((loMant >> 16) & 0xff);
- bytes[8] = (unsigned char) ((loMant >> 8) & 0xff);
- bytes[9] = (unsigned char) (loMant & 0xff);
-
-#ifdef _MSC_VER
-#pragma warning(default: 4244)
-#pragma warning(default: 4135)
-#endif /* Visual C++ */
-}
-/*
- * C O N V E R T F R O M I E E E E X T E N D E D
- */
-
-/*
- * Copyright (C) 1988-1991 Apple Computer, Inc.
- * All rights reserved.
- *
- * Machine-independent I/O routines for IEEE floating-point numbers.
- *
- * NaN's and infinities are converted to HUGE_VAL or HUGE, which
- * happens to be infinity on IEEE machines. Unfortunately, it is
- * impossible to preserve NaN's in a machine-independent way.
- * Infinities are, however, preserved on IEEE machines.
- *
- * These routines have been tested on the following machines:
- * Apple Macintosh, MPW 3.1 C compiler
- * Apple Macintosh, THINK C compiler
- * Silicon Graphics IRIS, MIPS compiler
- * Cray X/MP and Y/MP
- * Digital Equipment VAX
- *
- *
- * Implemented by Malcolm Slaney and Ken Turkowski.
- *
- * Malcolm Slaney contributions during 1988-1990 include big- and little-
- * endian file I/O, conversion to and from Motorola's extended 80-bit
- * floating-point format, and conversions to and from IEEE single-
- * precision floating-point format.
- *
- * In 1991, Ken Turkowski implemented the conversions to and from
- * IEEE double-precision format, added more precision to the extended
- * conversions, and accommodated conversions involving +/- infinity,
- * NaN's, and denormalized numbers.
- */
-
-#ifndef HUGE_VAL
-# define HUGE_VAL HUGE
-#endif /*HUGE_VAL*/
-
-# define UnsignedToFloat(u) (((double) ((long) (u - 2147483647L - 1))) + 2147483648.0)
/****************************************************************
- * Extended precision IEEE floating-point conversion routine.
+ * Extended precision IEEE floating-point conversion routines.
+ * Extended is an 80-bit number as defined by Motorola,
+ * with a sign bit, 15 bits of exponent (offset 16383?),
+ * and a 64-bit mantissa, with no hidden bit.
****************************************************************/
-double ConvertFromIeeeExtended(const unsigned char *bytes)
+WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes)
{
- double f;
- int expon;
- unsigned long hiMant, loMant;
+ wxFloat64 f;
+ wxInt32 expon;
+ wxUint32 hiMant, loMant;
expon = ((bytes[0] & 0x7F) << 8) | (bytes[1] & 0xFF);
- hiMant = ((unsigned long)(bytes[2] & 0xFF) << 24)
- | ((unsigned long) (bytes[3] & 0xFF) << 16)
- | ((unsigned long) (bytes[4] & 0xFF) << 8)
- | ((unsigned long) (bytes[5] & 0xFF));
- loMant = ((unsigned long) (bytes[6] & 0xFF) << 24)
- | ((unsigned long) (bytes[7] & 0xFF) << 16)
- | ((unsigned long) (bytes[8] & 0xFF) << 8)
- | ((unsigned long) (bytes[9] & 0xFF));
+ hiMant = ((wxUint32)(bytes[2] & 0xFF) << 24)
+ | ((wxUint32)(bytes[3] & 0xFF) << 16)
+ | ((wxUint32)(bytes[4] & 0xFF) << 8)
+ | ((wxUint32)(bytes[5] & 0xFF));
+ loMant = ((wxUint32)(bytes[6] & 0xFF) << 24)
+ | ((wxUint32)(bytes[7] & 0xFF) << 16)
+ | ((wxUint32)(bytes[8] & 0xFF) << 8)
+ | ((wxUint32)(bytes[9] & 0xFF));
if (expon == 0 && hiMant == 0 && loMant == 0) {
f = 0;
}
else {
- if (expon == 0x7FFF) { /* Infinity or NaN */
+ if (expon == 0x7FFF) { /* Infinity or NaN */
f = HUGE_VAL;
}
else {
return f;
}
+
+/****************************************************************/
+
+
+WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes)
+{
+ wxInt32 sign;
+ wxInt32 expon;
+ wxFloat64 fMant, fsMant;
+ wxUint32 hiMant, loMant;
+
+ if (num < 0) {
+ sign = 0x8000;
+ num *= -1;
+ } else {
+ sign = 0;
+ }
+
+ if (num == 0) {
+ expon = 0; hiMant = 0; loMant = 0;
+ }
+ else {
+ fMant = frexp(num, &expon);
+ if ((expon > 16384) || !(fMant < 1)) { /* Infinity or NaN */
+ expon = sign|0x7FFF; hiMant = 0; loMant = 0; /* infinity */
+ }
+ else { /* Finite */
+ expon += 16382;
+ if (expon < 0) { /* denormalized */
+ fMant = ldexp(fMant, expon);
+ expon = 0;
+ }
+ expon |= sign;
+ fMant = ldexp(fMant, 32); fsMant = floor(fMant); hiMant = FloatToUnsigned(fsMant);
+ fMant = ldexp(fMant - fsMant, 32); fsMant = floor(fMant); loMant = FloatToUnsigned(fsMant);
+ }
+ }
+
+ bytes[0] = expon >> 8;
+ bytes[1] = expon;
+ bytes[2] = hiMant >> 24;
+ bytes[3] = hiMant >> 16;
+ bytes[4] = hiMant >> 8;
+ bytes[5] = hiMant;
+ bytes[6] = loMant >> 24;
+ bytes[7] = loMant >> 16;
+ bytes[8] = loMant >> 8;
+ bytes[9] = loMant;
+}
+
+#if WXWIN_COMPATIBILITY_2_8
+WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes)
+{
+ return wxConvertFromIeeeExtended(bytes);
+}
+
+WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes)
+{
+ wxConvertToIeeeExtended(num, bytes);
+}
+#endif // WXWIN_COMPATIBILITY_2_8
+
#endif /* wxUSE_APPLE_IEEE */
projects / wxWidgets.git / blobdiff