Alexandre Lision | 7c6f4a6 | 2013-09-05 13:27:01 -0400 | [diff] [blame] | 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 | |