interpretor/libsndfile-1.0.25/src/sfendian.h

   1 /*
   2 ** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
   3 **
   4 ** This program is free software; you can redistribute it and/or modify
   5 ** it under the terms of the GNU Lesser General Public License as published by
   6 ** the Free Software Foundation; either version 2.1 of the License, or
   7 ** (at your option) any later version.
   8 **
   9 ** This program is distributed in the hope that it will be useful,
  10 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 ** GNU Lesser General Public License for more details.
  13 **
  14 ** You should have received a copy of the GNU Lesser General Public License
  15 ** along with this program; if not, write to the Free Software
  16 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 */
  18
  19 #ifndef SFENDIAN_INCLUDED
  20 #define SFENDIAN_INCLUDED
  21
  22 #include "sfconfig.h"
  23
  24 #if HAVE_STDINT_H
  25 #include <stdint.h>
  26 #elif HAVE_INTTYPES_H
  27 #include <inttypes.h>
  28 #endif
  29
  30 #if (defined (SIZEOF_INT64_T) && (SIZEOF_INT64_T == 8))
  31 /* Good, we have int64_t. */
  32 #elif (defined (SIZEOF_LONG_LONG) && (SIZEOF_LONG_LONG == 8))
  33 typedef long long int64_t ;
  34 #elif (defined (SIZEOF_LONG) && (SIZEOF_LONG == 8))
  35 typedef long int64_t ;
  36 #elif (defined (WIN32) || defined (_WIN32))
  37 typedef __int64 int64_t ;
  38 #else
  39 #error "No 64 bit integer type."
  40 #endif
  41
  42 #if HAVE_BYTESWAP_H
  43
  44 #include <byteswap.h>
  45
  46 #define ENDSWAP_SHORT(x)        ((short) bswap_16 (x))
  47 #define ENDSWAP_INT(x)          ((int) bswap_32 (x))
  48
  49 #else
  50
  51 #define ENDSWAP_SHORT(x)        ((((x) >> 8) & 0xFF) + (((x) & 0xFF) << 8))
  52 #define ENDSWAP_INT(x)          ((((x) >> 24) & 0xFF) + (((x) >> 8) & 0xFF00) + (((x) & 0xFF00) << 8) + (((x) & 0xFF) << 24))
  53
  54 #endif
  55
  56 /*
  57 ** Many file types (ie WAV, AIFF) use sets of four consecutive bytes as a
  58 ** marker indicating different sections of the file.
  59 ** The following MAKE_MARKER macro allows th creation of integer constants
  60 ** for these markers.
  61 */
  62
  63 #if (CPU_IS_LITTLE_ENDIAN == 1)
  64         #define MAKE_MARKER(a,b,c,d)    ((a) | ((b) << 8) | ((c) << 16) | ((d) << 24))
  65 #elif (CPU_IS_BIG_ENDIAN == 1)
  66         #define MAKE_MARKER(a,b,c,d)    (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
  67 #else
  68         #error "Target CPU endian-ness unknown. May need to hand edit src/sfconfig.h"
  69 #endif
  70
  71 /*
  72 ** Macros to handle reading of data of a specific endian-ness into host endian
  73 ** shorts and ints. The single input is an unsigned char* pointer to the start
  74 ** of the object. There are two versions of each macro as we need to deal with
  75 ** both big and little endian CPUs.
  76 */
  77
  78 #if (CPU_IS_LITTLE_ENDIAN == 1)
  79         #define LES2H_SHORT(x)                  (x)
  80         #define LEI2H_INT(x)                    (x)
  81
  82         #define BES2H_SHORT(x)                  ENDSWAP_SHORT (x)
  83         #define BEI2H_INT(x)                    ENDSWAP_INT (x)
  84
  85         #define H2BE_SHORT(x)                   ENDSWAP_SHORT (x)
  86         #define H2BE_INT(x)                             ENDSWAP_INT (x)
  87
  88 #elif (CPU_IS_BIG_ENDIAN == 1)
  89         #define LES2H_SHORT(x)                  ENDSWAP_SHORT (x)
  90         #define LEI2H_INT(x)                    ENDSWAP_INT (x)
  91
  92         #define BES2H_SHORT(x)                  (x)
  93         #define BEI2H_INT(x)                    (x)
  94
  95         #define H2LE_SHORT(x)                   ENDSWAP_SHORT (x)
  96         #define H2LE_INT(x)                             ENDSWAP_INT (x)
  97
  98 #else
  99         #error "Target CPU endian-ness unknown. May need to hand edit src/sfconfig.h"
 100 #endif
 101
 102 #define LET2H_SHORT_PTR(x)              ((x) [1] + ((x) [2] << 8))
 103 #define LET2H_INT_PTR(x)                (((x) [0] << 8) + ((x) [1] << 16) + ((x) [2] << 24))
 104
 105 #define BET2H_SHORT_PTR(x)              (((x) [0] << 8) + (x) [1])
 106 #define BET2H_INT_PTR(x)                (((x) [0] << 24) + ((x) [1] << 16) + ((x) [2] << 8))
 107
 108 /*-----------------------------------------------------------------------------------------------
 109 ** Generic functions for performing endian swapping on integer arrays.
 110 */
 111
 112 static inline void
 113 endswap_short_array (short *ptr, int len)
 114 {       short   temp ;
 115
 116         while (--len >= 0)
 117         {       temp = ptr [len] ;
 118                 ptr [len] = ENDSWAP_SHORT (temp) ;
 119                 } ;
 120 } /* endswap_short_array */
 121
 122 static inline void
 123 endswap_short_copy (short *dest, const short *src, int len)
 124 {
 125         while (--len >= 0)
 126         {       dest [len] = ENDSWAP_SHORT (src [len]) ;
 127                 } ;
 128 } /* endswap_short_copy */
 129
 130 static inline void
 131 endswap_int_array (int *ptr, int len)
 132 {       int temp ;
 133
 134         while (--len >= 0)
 135         {       temp = ptr [len] ;
 136                 ptr [len] = ENDSWAP_INT (temp) ;
 137                 } ;
 138 } /* endswap_int_array */
 139
 140 static inline void
 141 endswap_int_copy (int *dest, const int *src, int len)
 142 {
 143         while (--len >= 0)
 144         {       dest [len] = ENDSWAP_INT (src [len]) ;
 145                 } ;
 146 } /* endswap_int_copy */
 147
 148 /*========================================================================================
 149 */
 150
 151 #if     (HAVE_BYTESWAP_H && defined (SIZEOF_INT64_T) && (SIZEOF_INT64_T == 8))
 152
 153 static inline void
 154 endswap_int64_t_array (int64_t *ptr, int len)
 155 {       int64_t value ;
 156
 157         while (--len >= 0)
 158         {       value = ptr [len] ;
 159                 ptr [len] = bswap_64 (value) ;
 160                 } ;
 161 } /* endswap_int64_t_array */
 162
 163 static inline void
 164 endswap_int64_t_copy (int64_t *dest, const int64_t *src, int len)
 165 {       int64_t value ;
 166
 167         while (--len >= 0)
 168         {       value = src [len] ;
 169                 dest [len] = bswap_64 (value) ;
 170                 } ;
 171 } /* endswap_int64_t_copy */
 172
 173 #else
 174
 175 static inline void
 176 endswap_int64_t_array (int64_t *ptr, int len)
 177 {       unsigned char *ucptr, temp ;
 178
 179         ucptr = (unsigned char *) ptr ;
 180         ucptr += 8 * len ;
 181         while (--len >= 0)
 182         {       ucptr -= 8 ;
 183
 184                 temp = ucptr [0] ;
 185                 ucptr [0] = ucptr [7] ;
 186                 ucptr [7] = temp ;
 187
 188                 temp = ucptr [1] ;
 189                 ucptr [1] = ucptr [6] ;
 190                 ucptr [6] = temp ;
 191
 192                 temp = ucptr [2] ;
 193                 ucptr [2] = ucptr [5] ;
 194                 ucptr [5] = temp ;
 195
 196                 temp = ucptr [3] ;
 197                 ucptr [3] = ucptr [4] ;
 198                 ucptr [4] = temp ;
 199                 } ;
 200 } /* endswap_int64_t_array */
 201
 202 static inline void
 203 endswap_int64_t_copy (int64_t *dest, const int64_t *src, int len)
 204 {       const unsigned char *psrc ;
 205         unsigned char *pdest ;
 206
 207         if (dest == src)
 208         {       endswap_int64_t_array (dest, len) ;
 209                 return ;
 210                 } ;
 211
 212         psrc = ((const unsigned char *) src) + 8 * len ;
 213         pdest = ((unsigned char *) dest) + 8 * len ;
 214         while (--len >= 0)
 215         {       psrc -= 8 ;
 216                 pdest -= 8 ;
 217
 218                 pdest [0] = psrc [7] ;
 219                 pdest [2] = psrc [5] ;
 220                 pdest [4] = psrc [3] ;
 221                 pdest [6] = psrc [1] ;
 222                 pdest [7] = psrc [0] ;
 223                 pdest [1] = psrc [6] ;
 224                 pdest [3] = psrc [4] ;
 225                 pdest [5] = psrc [2] ;
 226                 } ;
 227 } /* endswap_int64_t_copy */
 228
 229 #endif
 230
 231 /* A couple of wrapper functions. */
 232
 233 static inline void
 234 endswap_float_array (float *ptr, int len)
 235 {       endswap_int_array ((void *) ptr, len) ;
 236 } /* endswap_float_array */
 237
 238 static inline void
 239 endswap_double_array (double *ptr, int len)
 240 {       endswap_int64_t_array ((void *) ptr, len) ;
 241 } /* endswap_double_array */
 242
 243 static inline void
 244 endswap_float_copy (float *dest, const float *src, int len)
 245 {       endswap_int_copy ((int *) dest, (const int *) src, len) ;
 246 } /* endswap_float_copy */
 247
 248 static inline void
 249 endswap_double_copy (double *dest, const double *src, int len)
 250 {       endswap_int64_t_copy ((int64_t *) dest, (const int64_t *) src, len) ;
 251 } /* endswap_double_copy */
 252
 253 #endif /* SFENDIAN_INCLUDED */
 254