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Diffstat (limited to 'src/sfendian.h')
| -rw-r--r-- | src/sfendian.h | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/src/sfendian.h b/src/sfendian.h new file mode 100644 index 0000000..386361c --- /dev/null +++ b/src/sfendian.h @@ -0,0 +1,254 @@ +/* +** Copyright (C) 1999-2011 Erik de Castro Lopo <erikd@mega-nerd.com> +** +** This program is free software; you can redistribute it and/or modify +** it under the terms of the GNU Lesser General Public License as published by +** the Free Software Foundation; either version 2.1 of the License, or +** (at your option) any later version. +** +** This program is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +** GNU Lesser General Public License for more details. +** +** You should have received a copy of the GNU Lesser General Public License +** along with this program; if not, write to the Free Software +** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +*/ + +#ifndef SFENDIAN_INCLUDED +#define SFENDIAN_INCLUDED + +#include "sfconfig.h" + +#if HAVE_STDINT_H +#include <stdint.h> +#elif HAVE_INTTYPES_H +#include <inttypes.h> +#endif + +#if (defined (SIZEOF_INT64_T) && (SIZEOF_INT64_T == 8)) +/* Good, we have int64_t. */ +#elif (defined (SIZEOF_LONG_LONG) && (SIZEOF_LONG_LONG == 8)) +typedef long long int64_t ; +#elif (defined (SIZEOF_LONG) && (SIZEOF_LONG == 8)) +typedef long int64_t ; +#elif (defined (WIN32) || defined (_WIN32)) +typedef __int64 int64_t ; +#else +#error "No 64 bit integer type." +#endif + +#if HAVE_BYTESWAP_H + +#include <byteswap.h> + +#define ENDSWAP_SHORT(x) ((short) bswap_16 (x)) +#define ENDSWAP_INT(x) ((int) bswap_32 (x)) + +#else + +#define ENDSWAP_SHORT(x) ((((x) >> 8) & 0xFF) + (((x) & 0xFF) << 8)) +#define ENDSWAP_INT(x) ((((x) >> 24) & 0xFF) + (((x) >> 8) & 0xFF00) + (((x) & 0xFF00) << 8) + (((x) & 0xFF) << 24)) + +#endif + +/* +** Many file types (ie WAV, AIFF) use sets of four consecutive bytes as a +** marker indicating different sections of the file. +** The following MAKE_MARKER macro allows th creation of integer constants +** for these markers. +*/ + +#if (CPU_IS_LITTLE_ENDIAN == 1) + #define MAKE_MARKER(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((d) << 24)) +#elif (CPU_IS_BIG_ENDIAN == 1) + #define MAKE_MARKER(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) +#else + #error "Target CPU endian-ness unknown. May need to hand edit src/sfconfig.h" +#endif + +/* +** Macros to handle reading of data of a specific endian-ness into host endian +** shorts and ints. The single input is an unsigned char* pointer to the start +** of the object. There are two versions of each macro as we need to deal with +** both big and little endian CPUs. +*/ + +#if (CPU_IS_LITTLE_ENDIAN == 1) + #define LES2H_SHORT(x) (x) + #define LEI2H_INT(x) (x) + + #define BES2H_SHORT(x) ENDSWAP_SHORT (x) + #define BEI2H_INT(x) ENDSWAP_INT (x) + + #define H2BE_SHORT(x) ENDSWAP_SHORT (x) + #define H2BE_INT(x) ENDSWAP_INT (x) + +#elif (CPU_IS_BIG_ENDIAN == 1) + #define LES2H_SHORT(x) ENDSWAP_SHORT (x) + #define LEI2H_INT(x) ENDSWAP_INT (x) + + #define BES2H_SHORT(x) (x) + #define BEI2H_INT(x) (x) + + #define H2LE_SHORT(x) ENDSWAP_SHORT (x) + #define H2LE_INT(x) ENDSWAP_INT (x) + +#else + #error "Target CPU endian-ness unknown. May need to hand edit src/sfconfig.h" +#endif + +#define LET2H_SHORT_PTR(x) ((x) [1] + ((x) [2] << 8)) +#define LET2H_INT_PTR(x) (((x) [0] << 8) + ((x) [1] << 16) + ((x) [2] << 24)) + +#define BET2H_SHORT_PTR(x) (((x) [0] << 8) + (x) [1]) +#define BET2H_INT_PTR(x) (((x) [0] << 24) + ((x) [1] << 16) + ((x) [2] << 8)) + +/*----------------------------------------------------------------------------------------------- +** Generic functions for performing endian swapping on integer arrays. +*/ + +static inline void +endswap_short_array (short *ptr, int len) +{ short temp ; + + while (--len >= 0) + { temp = ptr [len] ; + ptr [len] = ENDSWAP_SHORT (temp) ; + } ; +} /* endswap_short_array */ + +static inline void +endswap_short_copy (short *dest, const short *src, int len) +{ + while (--len >= 0) + { dest [len] = ENDSWAP_SHORT (src [len]) ; + } ; +} /* endswap_short_copy */ + +static inline void +endswap_int_array (int *ptr, int len) +{ int temp ; + + while (--len >= 0) + { temp = ptr [len] ; + ptr [len] = ENDSWAP_INT (temp) ; + } ; +} /* endswap_int_array */ + +static inline void +endswap_int_copy (int *dest, const int *src, int len) +{ + while (--len >= 0) + { dest [len] = ENDSWAP_INT (src [len]) ; + } ; +} /* endswap_int_copy */ + +/*======================================================================================== +*/ + +#if (HAVE_BYTESWAP_H && defined (SIZEOF_INT64_T) && (SIZEOF_INT64_T == 8)) + +static inline void +endswap_int64_t_array (int64_t *ptr, int len) +{ int64_t value ; + + while (--len >= 0) + { value = ptr [len] ; + ptr [len] = bswap_64 (value) ; + } ; +} /* endswap_int64_t_array */ + +static inline void +endswap_int64_t_copy (int64_t *dest, const int64_t *src, int len) +{ int64_t value ; + + while (--len >= 0) + { value = src [len] ; + dest [len] = bswap_64 (value) ; + } ; +} /* endswap_int64_t_copy */ + +#else + +static inline void +endswap_int64_t_array (int64_t *ptr, int len) +{ unsigned char *ucptr, temp ; + + ucptr = (unsigned char *) ptr ; + ucptr += 8 * len ; + while (--len >= 0) + { ucptr -= 8 ; + + temp = ucptr [0] ; + ucptr [0] = ucptr [7] ; + ucptr [7] = temp ; + + temp = ucptr [1] ; + ucptr [1] = ucptr [6] ; + ucptr [6] = temp ; + + temp = ucptr [2] ; + ucptr [2] = ucptr [5] ; + ucptr [5] = temp ; + + temp = ucptr [3] ; + ucptr [3] = ucptr [4] ; + ucptr [4] = temp ; + } ; +} /* endswap_int64_t_array */ + +static inline void +endswap_int64_t_copy (int64_t *dest, const int64_t *src, int len) +{ const unsigned char *psrc ; + unsigned char *pdest ; + + if (dest == src) + { endswap_int64_t_array (dest, len) ; + return ; + } ; + + psrc = ((const unsigned char *) src) + 8 * len ; + pdest = ((unsigned char *) dest) + 8 * len ; + while (--len >= 0) + { psrc -= 8 ; + pdest -= 8 ; + + pdest [0] = psrc [7] ; + pdest [2] = psrc [5] ; + pdest [4] = psrc [3] ; + pdest [6] = psrc [1] ; + pdest [7] = psrc [0] ; + pdest [1] = psrc [6] ; + pdest [3] = psrc [4] ; + pdest [5] = psrc [2] ; + } ; +} /* endswap_int64_t_copy */ + +#endif + +/* A couple of wrapper functions. */ + +static inline void +endswap_float_array (float *ptr, int len) +{ endswap_int_array ((void *) ptr, len) ; +} /* endswap_float_array */ + +static inline void +endswap_double_array (double *ptr, int len) +{ endswap_int64_t_array ((void *) ptr, len) ; +} /* endswap_double_array */ + +static inline void +endswap_float_copy (float *dest, const float *src, int len) +{ endswap_int_copy ((int *) dest, (const int *) src, len) ; +} /* endswap_float_copy */ + +static inline void +endswap_double_copy (double *dest, const double *src, int len) +{ endswap_int64_t_copy ((int64_t *) dest, (const int64_t *) src, len) ; +} /* endswap_double_copy */ + +#endif /* SFENDIAN_INCLUDED */ + |