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/*
** 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 */
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