/* ** Copyright (C) 1999-2009 Erik de Castro Lopo ** ** 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 #elif HAVE_INTTYPES_H #include #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 #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 */