#include "wx/setup.h"
+
#include <math.h>
#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
+ * C O N V E R T T O I E E E E X T E N D E D
*/
/* Copyright (C) 1988-1991 Apple Computer, Inc.
* 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.
*
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;
- }
-
- 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);
- }
- }
-
- /* disable the warning about 'possible loss of data' */
- #ifdef _MSC_VER
- #pragma warning(disable: 4244)
- #endif /* Visual C++ */
-
- bytes[0] = expon >> 8;
- bytes[1] = expon;
- bytes[2] = (unsigned char) hiMant >> 24;
- bytes[3] = (unsigned char) hiMant >> 16;
- bytes[4] = (unsigned char) hiMant >> 8;
- bytes[5] = (unsigned char) hiMant;
- bytes[6] = (unsigned char) loMant >> 24;
- bytes[7] = (unsigned char) loMant >> 16;
- bytes[8] = (unsigned char) loMant >> 8;
- bytes[9] = (unsigned char) loMant;
-
- #ifdef _MSC_VER
- #pragma warning(default: 4244)
- #endif /* Visual C++ */
+ int sign;
+ int expon;
+ double fMant, fsMant;
+ unsigned long 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);
+ }
+ }
+
+ /* 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
+ * C O N V E R T F R O M I E E E E X T E N D E D
*/
/*
* 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.
*
* 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
+ * 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.
double ConvertFromIeeeExtended(const unsigned char *bytes)
{
- double f;
- int expon;
- unsigned long 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));
-
- if (expon == 0 && hiMant == 0 && loMant == 0) {
- f = 0;
- }
- else {
- if (expon == 0x7FFF) { /* Infinity or NaN */
- f = HUGE_VAL;
- }
- else {
- expon -= 16383;
- f = ldexp(UnsignedToFloat(hiMant), expon-=31);
- f += ldexp(UnsignedToFloat(loMant), expon-=32);
- }
- }
-
- if (bytes[0] & 0x80)
- return -f;
- else
- return f;
+ double f;
+ int expon;
+ unsigned long 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));
+
+ if (expon == 0 && hiMant == 0 && loMant == 0) {
+ f = 0;
+ }
+ else {
+ if (expon == 0x7FFF) { /* Infinity or NaN */
+ f = HUGE_VAL;
+ }
+ else {
+ expon -= 16383;
+ f = ldexp(UnsignedToFloat(hiMant), expon-=31);
+ f += ldexp(UnsignedToFloat(loMant), expon-=32);
+ }
+ }
+
+ if (bytes[0] & 0x80)
+ return -f;
+ else
+ return f;
}
#endif /* wxUSE_APPLE_IEEE */
projects / wxWidgets.git / blobdiff