* Changed "true" to "TRUE" in some file: "true" doesn't exist in BC++ 5
* Added wxDataStream and wxProcess * Added the asynchronous end process notification on GTK and MSW * Updated configure* and setup.h * Added extended.c: Apple code to encode/decode float in IEEE format this code is removable by disabling USE_APPLE_CODEC git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@162 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Guilhem Lavaux
179
src/common/extended.c
Normal file
179
src/common/extended.c
Normal file
@@ -0,0 +1,179 @@
|
||||
#include "wx/setup.h"
|
||||
#include <math.h>
|
||||
|
||||
#if USE_APPLE_IEEE
|
||||
|
||||
/*
|
||||
* 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.
|
||||
* 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 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;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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.
|
||||
****************************************************************/
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
#endif USE_APPLE_IEEE
|
||||
Reference in New Issue
Block a user