src/sfendian.h

/*
** Copyright (C) 1999-2018 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"

#include <stdint.h>
#include <inttypes.h>

#ifndef __has_builtin
#define __has_builtin(x) 0
#endif

#if HAVE_BYTESWAP_H			/* Linux, any CPU */
#include <byteswap.h>

#define	ENDSWAP_16(x)		(bswap_16 (x))
#define	ENDSWAP_32(x)		(bswap_32 (x))
#define	ENDSWAP_64(x)		(bswap_64 (x))

#elif __has_builtin(__builtin_bswap16) && __has_builtin(__builtin_bswap32) && __has_builtin(__builtin_bswap64)

#define ENDSWAP_16(x) ((int16_t) __builtin_bswap16 ((uint16_t) x))
#define ENDSWAP_32(x) ((int32_t) __builtin_bswap32 ((uint32_t) x))
#define ENDSWAP_64(x) ((int64_t) __builtin_bswap64 ((uint64_t) x))

#elif COMPILER_IS_GCC

#if CPU_IS_X86

static inline int16_t
ENDSWAP_16X (int16_t x)
{	int16_t y ;
	__asm__ ("rorw $8, %w0" : "=r" (y) : "0" (x) : "cc") ;
	return y ;
} /* ENDSWAP_16 */

static inline int32_t
ENDSWAP_32X (int32_t x)
{	int32_t y ;
	__asm__ ("bswap %0" : "=r" (y) : "0" (x)) ;
	return y ;
} /* ENDSWAP_32 */

#define ENDSWAP_16 ENDSWAP_16X
#define ENDSWAP_32 ENDSWAP_32X

#endif

#if CPU_IS_X86_64

static inline int64_t
ENDSWAP_64X (int64_t x)
{	int64_t y ;
	__asm__ ("bswap %q0" : "=r" (y) : "0" (x)) ;
	return y ;
} /* ENDSWAP_64X */

#define ENDSWAP_64 ENDSWAP_64X

#endif

#elif defined _MSC_VER
#include <stdlib.h>

#define	ENDSWAP_16(x)		(_byteswap_ushort (x))
#define	ENDSWAP_32(x)		(_byteswap_ulong (x))
#define	ENDSWAP_64(x)		(_byteswap_uint64 (x))

#endif

#ifndef ENDSWAP_16
#define	ENDSWAP_16(x)		((((x) >> 8) & 0xFF) + (((x) & 0xFF) << 8))
#endif

#ifndef ENDSWAP_32
#define	ENDSWAP_32(x)		((((x) >> 24) & 0xFF) + (((x) >> 8) & 0xFF00) + (((x) & 0xFF00) << 8) + (((x) & 0xFF) << 24))
#endif

#ifndef ENDSWAP_64
static inline uint64_t
ENDSWAP_64 (uint64_t x)
{	union
	{	uint32_t parts [2] ;
		uint64_t whole ;
	} u ;
	uint32_t temp ;

	u.whole = x ;
	temp = u.parts [0] ;
	u.parts [0] = ENDSWAP_32 (u.parts [1]) ;
	u.parts [1] = ENDSWAP_32 (temp) ;
	return u.whole ;
}
#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)		((uint32_t) ((a) | ((b) << 8) | ((c) << 16) | (((uint32_t) (d)) << 24)))
#elif (CPU_IS_BIG_ENDIAN == 1)
	#define	MAKE_MARKER(a, b, c, d)		((uint32_t) ((((uint32_t) (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 LE2H_16(x)			(x)
	#define LE2H_32(x)			(x)

	#define BE2H_16(x)			ENDSWAP_16 (x)
	#define BE2H_32(x)			ENDSWAP_32 (x)
	#define BE2H_64(x)			ENDSWAP_64 (x)

	#define H2BE_16(x)			ENDSWAP_16 (x)
	#define H2BE_32(x)			ENDSWAP_32 (x)

	#define H2LE_16(x)			(x)
	#define H2LE_32(x)			(x)

#elif (CPU_IS_BIG_ENDIAN == 1)
	#define LE2H_16(x)			ENDSWAP_16 (x)
	#define LE2H_32(x)			ENDSWAP_32 (x)

	#define BE2H_16(x)			(x)
	#define BE2H_32(x)			(x)
	#define	BE2H_64(x)			(x)

	#define H2BE_16(x)			(x)
	#define H2BE_32(x)			(x)

	#define H2LE_16(x)			ENDSWAP_16 (x)
	#define H2LE_32(x)			ENDSWAP_32 (x)

#else
	#error "Target CPU endian-ness unknown. May need to hand edit src/sfconfig.h"
#endif

#define LE2H_32_PTR(x)			(((x) [0]) + ((x) [1] << 8) + ((x) [2] << 16) + ((x) [3] << 24))

#define LET2H_16_PTR(x)			((x) [1] + ((x) [2] << 8))
#define LET2H_32_PTR(x)			(((x) [0] << 8) + ((x) [1] << 16) + ((x) [2] << 24))

#define BET2H_16_PTR(x)			(((x) [0] << 8) + (x) [1])
#define BET2H_32_PTR(x)			(((x) [0] << 24) + ((x) [1] << 16) + ((x) [2] << 8))

static inline void
psf_put_be64 (uint8_t *ptr, int offset, int64_t value)
{
	ptr [offset] = (uint8_t) (value >> 56) ;
	ptr [offset + 1] = (uint8_t) (value >> 48) ;
	ptr [offset + 2] = (uint8_t) (value >> 40) ;
	ptr [offset + 3] = (uint8_t) (value >> 32) ;
	ptr [offset + 4] = (uint8_t) (value >> 24) ;
	ptr [offset + 5] = (uint8_t) (value >> 16) ;
	ptr [offset + 6] = (uint8_t) (value >> 8) ;
	ptr [offset + 7] = (uint8_t) value ;
} /* psf_put_be64 */

static inline void
psf_put_be32 (uint8_t *ptr, int offset, int32_t value)
{
	ptr [offset] = (uint8_t) (value >> 24) ;
	ptr [offset + 1] = (uint8_t) (value >> 16) ;
	ptr [offset + 2] = (uint8_t) (value >> 8) ;
	ptr [offset + 3] = (uint8_t) value ;
} /* psf_put_be32 */

static inline void
psf_put_be16 (uint8_t *ptr, int offset, int16_t value)
{
	ptr [offset] = (uint8_t) (value >> 8) ;
	ptr [offset + 1] = (uint8_t) value ;
} /* psf_put_be16 */

static inline int64_t
psf_get_be64 (const uint8_t *ptr, int offset)
{	int64_t value ;

	value = (int64_t) ((uint64_t) ptr [offset] << 24) ;
	value += (int64_t) ((uint64_t) ptr [offset + 1] << 16) ;
	value += (int64_t) ((uint64_t) ptr [offset + 2] << 8) ;
	value += ptr [offset + 3] ;

	value = (int64_t) (((uint64_t) value) << 32) ;

	value += (int64_t) ((uint64_t) ptr [offset + 4] << 24) ;
	value += (int64_t) ((uint64_t) ptr [offset + 5] << 16) ;
	value += (int64_t) ((uint64_t) ptr [offset + 6] << 8) ;
	value += ptr [offset + 7] ;
	return value ;
} /* psf_get_be64 */

static inline int64_t
psf_get_le64 (const uint8_t *ptr, int offset)
{	int64_t value = (int64_t) ((uint64_t) ptr [offset + 7] << 24) ;
	value += (int64_t) ((uint64_t) ptr [offset + 6] << 16) ;
	value += (int64_t) ((uint64_t) ptr [offset + 5] << 8) ;
	value += ptr [offset + 4] ;

	value = (int64_t) (((uint64_t) value) << 32) ;

	value += (int64_t) ((uint64_t) ptr [offset + 3] << 24) ;
	value += (int64_t) ((uint64_t) ptr [offset + 2] << 16) ;
	value += (int64_t) ((uint64_t) ptr [offset + 1] << 8) ;
	value += ptr [offset] ;
	return value ;
} /* psf_get_le64 */

static inline int32_t
psf_get_be32 (const uint8_t *ptr, int offset)
{	int32_t value = ((uint32_t) ptr [offset]) << 24 ;
	value += ptr [offset + 1] << 16 ;
	value += ptr [offset + 2] << 8 ;
	value += ptr [offset + 3] ;
	return value ;
} /* psf_get_be32 */

static inline int32_t
psf_get_le32 (const uint8_t *ptr, int offset)
{	int32_t value = ((uint32_t) ptr [offset + 3]) << 24 ;
	value += ptr [offset + 2] << 16 ;
	value += ptr [offset + 1] << 8 ;
	value += ptr [offset] ;
	return value ;
} /* psf_get_le32 */

static inline int32_t
psf_get_be24 (const uint8_t *ptr, int offset)
{	int32_t value = ((uint32_t) ptr [offset]) << 24 ;
	value += ptr [offset + 1] << 16 ;
	value += ptr [offset + 2] << 8 ;
	return value ;
} /* psf_get_be24 */

static inline int32_t
psf_get_le24 (const uint8_t *ptr, int offset)
{	int32_t value = ((uint32_t) ptr [offset + 2]) << 24 ;
	value += ptr [offset + 1] << 16 ;
	value += ptr [offset] << 8 ;
	return value ;
} /* psf_get_le24 */

static inline int16_t
psf_get_be16 (const uint8_t *ptr, int offset)
{	return (int16_t) (ptr [offset] << 8) + ptr [offset + 1] ;
} /* psf_get_be16 */

/*-----------------------------------------------------------------------------------------------
** Generic functions for performing endian swapping on integer arrays.
*/

static inline void
endswap_short_array (short *ptr, int len)
{
	for (int i = 0 ; i < len ; i++)
	{	short temp = ptr [i] ;
		ptr [i] = ENDSWAP_16 (temp) ;
		} ;
} /* endswap_short_array */

static inline void
endswap_short_copy (short *dest, const short *src, int len)
{
	for (int i = 0 ; i < len ; i++)
	{	dest [i] = ENDSWAP_16 (src [i]) ;
		} ;
} /* endswap_short_copy */

static inline void
endswap_int_array (int *ptr, int len)
{
	for (int i = 0 ; i < len ; i++)
	{	int temp = ptr [i] ;
		ptr [i] = ENDSWAP_32 (temp) ;
		} ;
} /* endswap_int_array */

static inline void
endswap_int_copy (int *dest, const int *src, int len)
{
	for (int i = 0 ; i < len ; i++)
	{	dest [i] = ENDSWAP_32 (src [i]) ;
		} ;
} /* endswap_int_copy */

/*========================================================================================
*/

static inline void
endswap_int64_t_array (int64_t *ptr, int len)
{
	for (int i = 0 ; i < len ; i++)
	{	int64_t value = ptr [i] ;
		ptr [i] = ENDSWAP_64 (value) ;
		} ;
} /* endswap_int64_t_array */

static inline void
endswap_int64_t_copy (int64_t *dest, const int64_t *src, int len)
{
	for (int i = 0 ; i < len ; i++)
	{	int64_t value = src [i] ;
		dest [i] = ENDSWAP_64 (value) ;
		} ;
} /* endswap_int64_t_copy */

/* A couple of wrapper functions. */

static inline void
endswap_float_array (float *ptr, int len)
{	endswap_int_array ((int *) ptr, len) ;
} /* endswap_float_array */

static inline void
endswap_double_array (double *ptr, int len)
{	endswap_int64_t_array ((int64_t *) 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 */