| #ifndef lint |
| static char rcsid[] = "$Header: /cvs/bao-parsec/ext/splash2/apps/volrend/src/libtiff/tif_machdep.c,v 1.1.1.1 2012/03/29 17:22:40 uid42307 Exp $"; |
| #endif |
| |
| /* |
| * Copyright (c) 1992 Sam Leffler |
| * Copyright (c) 1992 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. |
| */ |
| |
| /* |
| * TIFF Library Machine Dependent Routines. |
| */ |
| #include "tiffioP.h" |
| |
| #ifdef tahoe |
| typedef struct ieeedouble { |
| u_long sign : 1, |
| exp : 11, |
| mant : 20; |
| u_long mant2; |
| } ieeedouble; |
| typedef struct ieeefloat { |
| u_long sign : 1, |
| exp : 8, |
| mant : 23; |
| } ieeefloat; |
| |
| typedef struct { |
| u_long sign : 1, |
| exp : 8, |
| mant : 23; |
| u_long mant2; |
| } nativedouble; |
| typedef struct { |
| u_long sign : 1, |
| exp : 8, |
| mant : 23; |
| } nativefloat; |
| /* |
| * 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; \ |
| } |
| #endif /* tahoe */ |
| |
| #ifdef vax |
| typedef struct ieeedouble { |
| u_long mant : 20, |
| exp : 11, |
| sign : 1; |
| u_long mant2; |
| } ieeedouble; |
| typedef struct ieeefloat { |
| u_long mant : 23, |
| exp : 8, |
| sign : 1; |
| } ieeefloat; |
| |
| typedef struct { |
| u_long mant1 : 7, |
| exp : 8, |
| sign : 1, |
| mant2 : 16; |
| u_long mant3; |
| } nativedouble; |
| typedef struct { |
| u_long mant1 : 7, |
| exp : 8, |
| sign : 1, |
| mant2 : 16; |
| } nativefloat; |
| /* |
| * 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) = t; \ |
| } |
| #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; \ |
| } |
| #endif /* vax */ |
| |
| #if !HAVE_IEEEFP |
| #if !defined(IEEEFLOAT2NATIVE) || !defined(NATIVE2IEEEFLOAT) |
| "Help, you've configured the library to not have IEEE floating point,\ |
| but not defined how to convert between IEEE and native formats!" |
| #endif |
| |
| /* |
| * These unions are used during floating point |
| * conversions. The above macros define the |
| * conversion operations. |
| */ |
| 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; |
| |
| TIFFCvtIEEEFloatToNative(tif, n, f) |
| TIFF *tif; |
| u_int n; |
| float *f; |
| { |
| float_t *fp = (float_t *)f; |
| |
| while (n-- > 0) { |
| IEEEFLOAT2NATIVE(fp); |
| fp++; |
| } |
| } |
| |
| TIFFCvtNativeToIEEEFloat(tif, n, f) |
| TIFF *tif; |
| u_int n; |
| float *f; |
| { |
| float_t *fp = (float_t *)f; |
| |
| while (n-- > 0) { |
| NATIVE2IEEEFLOAT(fp); |
| fp++; |
| } |
| } |
| #endif |