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/* $Header: /usr/people/sam/tiff/libtiff/junk/machdep.h,v 1.16 91/07/16 16:30:45 sam Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1991 Sam Leffler
* Copyright (c) 1991 Silicon Graphics, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#ifndef _MACHDEP_
#define _MACHDEP_
/*
* Machine dependent definitions:
* o floating point formats
* o byte ordering
*
* NB, there are lots of assumptions here:
* - 32-bit natural integers (sign extension code)
* - native float is 4 bytes (floating point conversion)
* - native double is 8 bytes (floating point conversion)
*/
#if defined(sun) || defined(sparc) || defined(stellar) || defined(MIPSEB) || defined(hpux) || defined(apollo) || defined(NeXT) || defined(_IBMR2)
#define BIGENDIAN 1
#define IEEEFP
#endif /* sun || sparc || stellar || MIPSEB || hpux || apollo || NeXT || _IBMR2 */
/* MIPSEL = MIPS w/ Little Endian byte ordering (e.g. DEC 3100) */
#if defined(MIPSEL)
#define BIGENDIAN 0
#define IEEEFP
#endif /* MIPSEL */
#ifdef transputer
#define BIGENDIAN 0
#define IEEEFP /* IEEE floating point supported */
#endif /* transputer */
#if defined(m386) || defined(M_I86) || defined(i386)
#define BIGENDIAN 0
#define IEEEFP /* IEEE floating point supported */
#endif /* m386 || M_I86 || i386 */
#ifdef IEEEFP
typedef struct ieeedouble nativedouble;
typedef struct ieeefloat nativefloat;
#define ISFRACTION(e) (1022 - 4 <= (e) && (e) <= 1022 + 15)
#define EXTRACTFRACTION(dp, fract) \
((fract) = ((unsigned long)(1<<31)|((dp)->native.mant<<11)|\
((dp)->native.mant2>>21)) >> (1022+16-(dp)->native.exp))
#define EXTRACTEXPONENT(dp, exponent) ((exponent) = (dp)->native.exp)
#define NATIVE2IEEEFLOAT(fp)
#define IEEEFLOAT2NATIVE(fp)
#define IEEEDOUBLE2NATIVE(dp)
#define TIFFSwabArrayOfFloat(fp,n) TIFFSwabArrayOfLong((unsigned long *)fp,n)
#define TIFFSwabArrayOfDouble(dp,n) TIFFSwabArrayOfLong((unsigned long *)dp,2*n)
#endif /* IEEEFP */
#ifdef tahoe
#define BIGENDIAN 1
typedef struct {
unsigned sign:1;
unsigned exp:8;
unsigned mant:23;
unsigned mant2;
} nativedouble;
typedef struct {
unsigned sign:1;
unsigned exp:8;
unsigned mant:23;
} nativefloat;
#define ISFRACTION(e) (128 - 4 <= (e) && (e) <= 128 + 15)
#define EXTRACTFRACTION(dp, fract) \
((fract) = ((1<<31)|((dp)->native.mant<<8)|((dp)->native.mant2>>15)) >> \
(128+16-(dp)->native.exp))
#define EXTRACTEXPONENT(dp, exponent) ((exponent) = (dp)->native.exp - 2)
/*
* Beware, over/under-flow in conversions will
* result in garbage values -- handling it would
* require a subroutine call or lots more code.
*/
#define NATIVE2IEEEFLOAT(fp) { \
if ((fp)->native.exp) \
(fp)->ieee.exp = (fp)->native.exp - 129 + 127; /* alter bias */\
}
#define IEEEFLOAT2NATIVE(fp) { \
if ((fp)->ieee.exp) \
(fp)->native.exp = (fp)->ieee.exp - 127 + 129; /* alter bias */\
}
#define IEEEDOUBLE2NATIVE(dp) { \
if ((dp)->native.exp = (dp)->ieee.exp) \
(dp)->native.exp += -1023 + 129; \
(dp)->native.mant = ((dp)->ieee.mant<<3)|((dp)->native.mant2>>29); \
(dp)->native.mant2 <<= 3; \
}
/* the following is to work around a compiler bug... */
#define SIGNEXTEND(a,b) { char ch; ch = (a); (b) = ch; }
#define TIFFSwabArrayOfFloat(fp,n) TIFFSwabArrayOfLong((unsigned long *)fp,n)
#define TIFFSwabArrayOfDouble(dp,n) TIFFSwabArrayOfLong((unsigned long *)dp,2*n)
#endif /* tahoe */
#ifdef vax
#define BIGENDIAN 0
typedef struct {
unsigned mant1:7;
unsigned exp:8;
unsigned sign:1;
unsigned mant2:16;
unsigned mant3;
} nativedouble;
typedef struct {
unsigned mant1:7;
unsigned exp:8;
unsigned sign:1;
unsigned mant2:16;
} nativefloat;
#define ISFRACTION(e) (128 - 4 <= (e) && (e) <= 128 + 15)
#define EXTRACTFRACTION(dp, fract) \
((fract) = ((1<<31)|((dp)->native.mant1<<16)|(dp)->native.mant2)) >> \
(128+16-(dp)->native.exp))
#define EXTRACTEXPONENT(dp, exponent) ((exponent) = (dp)->native.exp - 2)
/*
* Beware, these do not handle over/under-flow
* during conversion from ieee to native format.
*/
#define NATIVE2IEEEFLOAT(fp) { \
float_t t; \
if (t.ieee.exp = (fp)->native.exp) \
t.ieee.exp += -129 + 127; \
t.ieee.sign = (fp)->native.sign; \
t.ieee.mant = ((fp)->native.mant1<<16)|(fp)->native.mant2; \
*(fp) = t; \
}
#define IEEEFLOAT2NATIVE(fp) { \
float_t t; int v = (fp)->ieee.exp; \
if (v) v += -127 + 129; /* alter bias of exponent */\
t.native.exp = v; /* implicit truncation of exponent */\
t.native.sign = (fp)->ieee.sign; \
v = (fp)->ieee.mant; \
t.native.mant1 = v >> 16; \
t.native.mant2 = v;\
*(fp) = v; \
}
#define IEEEDOUBLE2NATIVE(dp) { \
double_t t; int v = (dp)->ieee.exp; \
if (v) v += -1023 + 129; /* if can alter bias of exponent */\
t.native.exp = v; /* implicit truncation of exponent */\
v = (dp)->ieee.mant; \
t.native.sign = (dp)->ieee.sign; \
t.native.mant1 = v >> 16; \
t.native.mant2 = v;\
t.native.mant3 = (dp)->mant2; \
*(dp) = t; \
}
#define TIFFSwabArrayOfFloat(fp,n) TIFFSwabArrayOfLong((unsigned long *)fp,n)
#define TIFFSwabArrayOfDouble(dp,n) TIFFSwabArrayOfLong((unsigned long *)dp,2*n)
#endif /* vax */
/*
* These unions are used during floating point
* conversions. The macros given above define
* the conversion operations.
*/
typedef struct ieeedouble {
#if BIGENDIAN == 1
#if !defined(_IBMR2)
unsigned sign:1;
unsigned exp:11;
unsigned long mant:20;
unsigned mant2;
#else /* _IBMR2 */
unsigned sign:1;
unsigned exp:11;
unsigned mant:20;
unsigned mant2;
#endif /* _IBMR2 */
#else
#if !defined(vax)
#ifdef INT_16_BIT /* MSDOS C compilers */
unsigned long mant2;
unsigned long mant:20;
unsigned long exp:11;
unsigned long sign:1;
#else /* 32 bit ints */
unsigned mant2;
unsigned long mant:20;
unsigned exp:11;
unsigned sign:1;
#endif /* 32 bit ints */
#else
unsigned long mant:20;
unsigned exp:11;
unsigned sign:1;
unsigned mant2;
#endif /* !vax */
#endif
} ieeedouble;
typedef struct ieeefloat {
#if BIGENDIAN == 1
#if !defined(_IBMR2)
unsigned sign:1;
unsigned exp:8;
unsigned long mant:23;
#else /* _IBMR2 */
unsigned sign:1;
unsigned exp:8;
unsigned mant:23;
#endif /* _IBMR2 */
#else
#ifdef INT_16_BIT /* MSDOS C compilers */
unsigned long mant:23;
unsigned long exp:8;
unsigned long sign:1;
#else /* 32 bit ints */
unsigned long mant:23;
unsigned exp:8;
unsigned sign:1;
#endif /* 32 bit ints */
#endif
} ieeefloat;
typedef union {
ieeedouble ieee;
nativedouble native;
char b[8];
double d;
} double_t;
typedef union {
ieeefloat ieee;
nativefloat native;
char b[4];
float f;
} float_t;
#endif /* _MACHDEP_ */
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