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media/libvorbis/lib/os.h@97036ab72558 (annotated)

media/libvorbis/lib/os.h

Tue, 06 Jan 2015 21:39:09 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Tue, 06 Jan 2015 21:39:09 +0100
branch
TOR_BUG_9701
changeset 8
97036ab72558
permissions
-rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

michael@0 1 #ifndef _OS_H
michael@0 2 #define _OS_H
michael@0 3 /********************************************************************
michael@0 4 * *
michael@0 5 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
michael@0 6 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
michael@0 7 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
michael@0 8 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
michael@0 9 * *
michael@0 10 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2009 *
michael@0 11 * by the Xiph.Org Foundation http://www.xiph.org/ *
michael@0 12 * *
michael@0 13 ********************************************************************
michael@0 14
michael@0 15 function: #ifdef jail to whip a few platforms into the UNIX ideal.
michael@0 16 last mod: $Id: os.h 19031 2013-12-03 19:20:50Z tterribe $
michael@0 17
michael@0 18 ********************************************************************/
michael@0 19
michael@0 20 #ifdef HAVE_CONFIG_H
michael@0 21 #include "config.h"
michael@0 22 #endif
michael@0 23
michael@0 24 #include <math.h>
michael@0 25 #include <ogg/os_types.h>
michael@0 26
michael@0 27 #include "misc.h"
michael@0 28
michael@0 29 #ifndef _V_IFDEFJAIL_H_
michael@0 30 # define _V_IFDEFJAIL_H_
michael@0 31
michael@0 32 # ifdef __GNUC__
michael@0 33 # define STIN static __inline__
michael@0 34 # elif _WIN32
michael@0 35 # define STIN static __inline
michael@0 36 # else
michael@0 37 # define STIN static
michael@0 38 # endif
michael@0 39
michael@0 40 #ifdef DJGPP
michael@0 41 # define rint(x) (floor((x)+0.5f))
michael@0 42 #endif
michael@0 43
michael@0 44 #ifndef M_PI
michael@0 45 # define M_PI (3.1415926536f)
michael@0 46 #endif
michael@0 47
michael@0 48 #if defined(_WIN32) && !defined(__SYMBIAN32__)
michael@0 49 # include <malloc.h>
michael@0 50 # define rint(x) (floor((x)+0.5f))
michael@0 51 # define NO_FLOAT_MATH_LIB
michael@0 52 # define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
michael@0 53 #endif
michael@0 54
michael@0 55 #if defined(__SYMBIAN32__) && defined(__WINS__)
michael@0 56 void *_alloca(size_t size);
michael@0 57 # define alloca _alloca
michael@0 58 #endif
michael@0 59
michael@0 60 #ifndef FAST_HYPOT
michael@0 61 # define FAST_HYPOT hypot
michael@0 62 #endif
michael@0 63
michael@0 64 #endif
michael@0 65
michael@0 66 #ifdef HAVE_ALLOCA_H
michael@0 67 # include <alloca.h>
michael@0 68 #endif
michael@0 69
michael@0 70 #ifdef USE_MEMORY_H
michael@0 71 # include <memory.h>
michael@0 72 #endif
michael@0 73
michael@0 74 #ifndef min
michael@0 75 # define min(x,y) ((x)>(y)?(y):(x))
michael@0 76 #endif
michael@0 77
michael@0 78 #ifndef max
michael@0 79 # define max(x,y) ((x)<(y)?(y):(x))
michael@0 80 #endif
michael@0 81
michael@0 82
michael@0 83 /* Special i386 GCC implementation */
michael@0 84 #if defined(__i386__) && defined(__GNUC__) && !defined(__BEOS__)
michael@0 85 # define VORBIS_FPU_CONTROL
michael@0 86 /* both GCC and MSVC are kinda stupid about rounding/casting to int.
michael@0 87 Because of encapsulation constraints (GCC can't see inside the asm
michael@0 88 block and so we end up doing stupid things like a store/load that
michael@0 89 is collectively a noop), we do it this way */
michael@0 90
michael@0 91 /* we must set up the fpu before this works!! */
michael@0 92
michael@0 93 typedef ogg_int16_t vorbis_fpu_control;
michael@0 94
michael@0 95 static inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
michael@0 96 ogg_int16_t ret;
michael@0 97 ogg_int16_t temp;
michael@0 98 __asm__ __volatile__("fnstcw %0\n\t"
michael@0 99 "movw %0,%%dx\n\t"
michael@0 100 "andw $62463,%%dx\n\t"
michael@0 101 "movw %%dx,%1\n\t"
michael@0 102 "fldcw %1\n\t":"=m"(ret):"m"(temp): "dx");
michael@0 103 *fpu=ret;
michael@0 104 }
michael@0 105
michael@0 106 static inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
michael@0 107 __asm__ __volatile__("fldcw %0":: "m"(fpu));
michael@0 108 }
michael@0 109
michael@0 110 /* assumes the FPU is in round mode! */
michael@0 111 static inline int vorbis_ftoi(double f){ /* yes, double! Otherwise,
michael@0 112 we get extra fst/fld to
michael@0 113 truncate precision */
michael@0 114 int i;
michael@0 115 __asm__("fistl %0": "=m"(i) : "t"(f));
michael@0 116 return(i);
michael@0 117 }
michael@0 118 #endif /* Special i386 GCC implementation */
michael@0 119
michael@0 120
michael@0 121 /* MSVC inline assembly. 32 bit only; inline ASM isn't implemented in the
michael@0 122 * 64 bit compiler */
michael@0 123 #if defined(_MSC_VER) && !defined(_WIN64) && !defined(_WIN32_WCE)
michael@0 124 # define VORBIS_FPU_CONTROL
michael@0 125
michael@0 126 typedef ogg_int16_t vorbis_fpu_control;
michael@0 127
michael@0 128 static __inline int vorbis_ftoi(double f){
michael@0 129 int i;
michael@0 130 __asm{
michael@0 131 fld f
michael@0 132 fistp i
michael@0 133 }
michael@0 134 return i;
michael@0 135 }
michael@0 136
michael@0 137 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
michael@0 138 (void)fpu;
michael@0 139 }
michael@0 140
michael@0 141 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
michael@0 142 (void)fpu;
michael@0 143 }
michael@0 144
michael@0 145 #endif /* Special MSVC 32 bit implementation */
michael@0 146
michael@0 147
michael@0 148 /* Optimized code path for x86_64 builds. Uses SSE2 intrinsics. This can be
michael@0 149 done safely because all x86_64 CPUs supports SSE2. */
michael@0 150 #if (defined(_MSC_VER) && defined(_WIN64)) || (defined(__GNUC__) && defined (__x86_64__))
michael@0 151 # define VORBIS_FPU_CONTROL
michael@0 152
michael@0 153 typedef ogg_int16_t vorbis_fpu_control;
michael@0 154
michael@0 155 #include <emmintrin.h>
michael@0 156 static __inline int vorbis_ftoi(double f){
michael@0 157 return _mm_cvtsd_si32(_mm_load_sd(&f));
michael@0 158 }
michael@0 159
michael@0 160 static __inline void vorbis_fpu_setround(vorbis_fpu_control *fpu){
michael@0 161 (void)fpu;
michael@0 162 }
michael@0 163
michael@0 164 static __inline void vorbis_fpu_restore(vorbis_fpu_control fpu){
michael@0 165 (void)fpu;
michael@0 166 }
michael@0 167
michael@0 168 #endif /* Special MSVC x64 implementation */
michael@0 169
michael@0 170
michael@0 171 /* If no special implementation was found for the current compiler / platform,
michael@0 172 use the default implementation here: */
michael@0 173 #ifndef VORBIS_FPU_CONTROL
michael@0 174
michael@0 175 typedef int vorbis_fpu_control;
michael@0 176
michael@0 177 static int vorbis_ftoi(double f){
michael@0 178 /* Note: MSVC and GCC (at least on some systems) round towards zero, thus,
michael@0 179 the floor() call is required to ensure correct roudning of
michael@0 180 negative numbers */
michael@0 181 return (int)floor(f+.5);
michael@0 182 }
michael@0 183
michael@0 184 /* We don't have special code for this compiler/arch, so do it the slow way */
michael@0 185 # define vorbis_fpu_setround(vorbis_fpu_control) {}
michael@0 186 # define vorbis_fpu_restore(vorbis_fpu_control) {}
michael@0 187
michael@0 188 #endif /* default implementation */
michael@0 189
michael@0 190 #endif /* _OS_H */

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