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compat.h
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#ifndef __GLIB_H__
#define __GLIB_H__
#include <stdint.h>
#ifdef __APPLE__
#include <machine/endian.h>
#else
#include <endian.h>
#endif
#define G_BYTE_ORDER BYTE_ORDER
#define GUINT16_SWAP_LE_BE_CONSTANT(val) ((uint16_t) ( \
(uint16_t) ((uint16_t) (val) >> 8) | \
(uint16_t) ((uint16_t) (val) << 8)))
#define GUINT32_SWAP_LE_BE_CONSTANT(val) ((uint32_t) ( \
(((uint32_t) (val) & (uint32_t) 0x000000ffU) << 24) | \
(((uint32_t) (val) & (uint32_t) 0x0000ff00U) << 8) | \
(((uint32_t) (val) & (uint32_t) 0x00ff0000U) >> 8) | \
(((uint32_t) (val) & (uint32_t) 0xff000000U) >> 24)))
#if BYTE_ORDER == LITTLE_ENDIAN
#define GINT16_TO_LE(val) ((int16_t) (val))
#define GUINT16_TO_LE(val) ((uint16_t) (val))
#define GINT16_TO_BE(val) ((int16_t) GUINT16_SWAP_LE_BE (val))
#define GUINT16_TO_BE(val) (GUINT16_SWAP_LE_BE (val))
#define GINT32_TO_LE(val) ((int32_t) (val))
#define GUINT32_TO_LE(val) ((uint32_t) (val))
#define GINT32_TO_BE(val) ((int32_t) GUINT32_SWAP_LE_BE (val))
#define GUINT32_TO_BE(val) (GUINT32_SWAP_LE_BE (val))
#else
#define GINT16_TO_LE(val) ((int16_t) GUINT16_SWAP_LE_BE (val))
#define GUINT16_TO_LE(val) (GUINT16_SWAP_LE_BE (val))
#define GINT16_TO_BE(val) ((int16_t) (val))
#define GUINT16_TO_BE(val) ((uint16_t) (val))
#define GINT32_TO_LE(val) ((int32_t) GUINT32_SWAP_LE_BE (val))
#define GUINT32_TO_LE(val) (GUINT32_SWAP_LE_BE (val))
#define GINT32_TO_BE(val) ((int32_t) (val))
#define GUINT32_TO_BE(val) ((uint32_t) (val))
#endif
/* Arch specific stuff for speed
*/
#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
# if defined (__i386__)
# define GUINT16_SWAP_LE_BE_IA32(val) \
(__extension__ \
({ register uint16_t __v, __x = ((uint16_t) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT16_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("rorw $8, %w0" \
: "=r" (__v) \
: "0" (__x) \
: "cc"); \
__v; }))
# if !defined (__i486__) && !defined (__i586__) \
&& !defined (__pentium__) && !defined (__i686__) \
&& !defined (__pentiumpro__) && !defined (__pentium4__)
# define GUINT32_SWAP_LE_BE_IA32(val) \
(__extension__ \
({ register uint32_t __v, __x = ((uint32_t) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("rorw $8, %w0\n\t" \
"rorl $16, %0\n\t" \
"rorw $8, %w0" \
: "=r" (__v) \
: "0" (__x) \
: "cc"); \
__v; }))
# else /* 486 and higher has bswap */
# define GUINT32_SWAP_LE_BE_IA32(val) \
(__extension__ \
({ register uint32_t __v, __x = ((uint32_t) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("bswap %0" \
: "=r" (__v) \
: "0" (__x)); \
__v; }))
# endif /* processor specific 32-bit stuff */
/* Possibly just use the constant version and let gcc figure it out? */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA32 (val))
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_IA32 (val))
# elif defined (__ia64__)
# define GUINT16_SWAP_LE_BE_IA64(val) \
(__extension__ \
({ register uint16_t __v, __x = ((uint16_t) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT16_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ __volatile__ ("shl %0 = %1, 48 ;;" \
"mux1 %0 = %0, @rev ;;" \
: "=r" (__v) \
: "r" (__x)); \
__v; }))
# define GUINT32_SWAP_LE_BE_IA64(val) \
(__extension__ \
({ register uint32_t __v, __x = ((uint32_t) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ __volatile__ ("shl %0 = %1, 32 ;;" \
"mux1 %0 = %0, @rev ;;" \
: "=r" (__v) \
: "r" (__x)); \
__v; }))
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_IA64 (val))
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_IA64 (val))
# elif defined (__x86_64__)
# define GUINT32_SWAP_LE_BE_X86_64(val) \
(__extension__ \
({ register uint32_t __v, __x = ((uint32_t) (val)); \
if (__builtin_constant_p (__x)) \
__v = GUINT32_SWAP_LE_BE_CONSTANT (__x); \
else \
__asm__ ("bswapl %0" \
: "=r" (__v) \
: "0" (__x)); \
__v; }))
/* gcc seems to figure out optimal code for this on its own */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_X86_64 (val))
# else /* generic gcc */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_CONSTANT (val))
# endif
#else /* generic */
# define GUINT16_SWAP_LE_BE(val) (GUINT16_SWAP_LE_BE_CONSTANT (val))
# define GUINT32_SWAP_LE_BE(val) (GUINT32_SWAP_LE_BE_CONSTANT (val))
#endif /* generic */
#define GUINT16_SWAP_LE_PDP(val) ((uint16_t) (val))
#define GUINT16_SWAP_BE_PDP(val) (GUINT16_SWAP_LE_BE (val))
#define GUINT32_SWAP_LE_PDP(val) ((uint32_t) ( \
(((uint32_t) (val) & (uint32_t) 0x0000ffffU) << 16) | \
(((uint32_t) (val) & (uint32_t) 0xffff0000U) >> 16)))
#define GUINT32_SWAP_BE_PDP(val) ((uint32_t) ( \
(((uint32_t) (val) & (uint32_t) 0x00ff00ffU) << 8) | \
(((uint32_t) (val) & (uint32_t) 0xff00ff00U) >> 8)))
/* The G*_TO_?E() macros are defined in glibconfig.h.
* The transformation is symmetric, so the FROM just maps to the TO.
*/
#define GINT16_FROM_LE(val) (GINT16_TO_LE (val))
#define GUINT16_FROM_LE(val) (GUINT16_TO_LE (val))
#define GINT16_FROM_BE(val) (GINT16_TO_BE (val))
#define GUINT16_FROM_BE(val) (GUINT16_TO_BE (val))
#define GINT32_FROM_LE(val) (GINT32_TO_LE (val))
#define GUINT32_FROM_LE(val) (GUINT32_TO_LE (val))
#define GINT32_FROM_BE(val) (GINT32_TO_BE (val))
#define GUINT32_FROM_BE(val) (GUINT32_TO_BE (val))
#endif