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#ifndef ASM_UNALIGNED_H
#define ASM_UNALIGNED_H
#include <assert.h>
#include <linux/string.h>
#include <linux/types.h>
#define _LITTLE_ENDIAN 1
static unsigned _isLittleEndian(void)
{
const union { uint32_t u; uint8_t c[4]; } one = { 1 };
assert(_LITTLE_ENDIAN == one.c[0]);
return _LITTLE_ENDIAN;
}
static uint16_t _swap16(uint16_t in)
{
return ((in & 0xF) << 8) + ((in & 0xF0) >> 8);
}
static uint32_t _swap32(uint32_t in)
{
return __builtin_bswap32(in);
}
static uint64_t _swap64(uint64_t in)
{
return __builtin_bswap64(in);
}
/* Little endian */
static uint16_t get_unaligned_le16(const void* memPtr)
{
uint16_t val;
memcpy(&val, memPtr, sizeof(val));
if (!_isLittleEndian()) _swap16(val);
return val;
}
static uint32_t get_unaligned_le32(const void* memPtr)
{
uint32_t val;
memcpy(&val, memPtr, sizeof(val));
if (!_isLittleEndian()) _swap32(val);
return val;
}
static uint64_t get_unaligned_le64(const void* memPtr)
{
uint64_t val;
memcpy(&val, memPtr, sizeof(val));
if (!_isLittleEndian()) _swap64(val);
return val;
}
static void put_unaligned_le16(uint16_t value, void* memPtr)
{
if (!_isLittleEndian()) value = _swap16(value);
memcpy(memPtr, &value, sizeof(value));
}
static void put_unaligned_le32(uint32_t value, void* memPtr)
{
if (!_isLittleEndian()) value = _swap32(value);
memcpy(memPtr, &value, sizeof(value));
}
static void put_unaligned_le64(uint64_t value, void* memPtr)
{
if (!_isLittleEndian()) value = _swap64(value);
memcpy(memPtr, &value, sizeof(value));
}
/* big endian */
static uint32_t get_unaligned_be32(const void* memPtr)
{
uint32_t val;
memcpy(&val, memPtr, sizeof(val));
if (_isLittleEndian()) _swap32(val);
return val;
}
static uint64_t get_unaligned_be64(const void* memPtr)
{
uint64_t val;
memcpy(&val, memPtr, sizeof(val));
if (_isLittleEndian()) _swap64(val);
return val;
}
static void put_unaligned_be32(uint32_t value, void* memPtr)
{
if (_isLittleEndian()) value = _swap32(value);
memcpy(memPtr, &value, sizeof(value));
}
static void put_unaligned_be64(uint64_t value, void* memPtr)
{
if (_isLittleEndian()) value = _swap64(value);
memcpy(memPtr, &value, sizeof(value));
}
/* generic */
extern void __bad_unaligned_access_size(void);
#define __get_unaligned_le(ptr) ((typeof(*(ptr)))({ \
__builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
__builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \
__builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \
__builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \
__bad_unaligned_access_size())))); \
}))
#define __get_unaligned_be(ptr) ((typeof(*(ptr)))({ \
__builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \
__builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)), \
__builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)), \
__builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)), \
__bad_unaligned_access_size())))); \
}))
#define __put_unaligned_le(val, ptr) \
({ \
void *__gu_p = (ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
*(uint8_t *)__gu_p = (uint8_t)(val); \
break; \
case 2: \
put_unaligned_le16((uint16_t)(val), __gu_p); \
break; \
case 4: \
put_unaligned_le32((uint32_t)(val), __gu_p); \
break; \
case 8: \
put_unaligned_le64((uint64_t)(val), __gu_p); \
break; \
default: \
__bad_unaligned_access_size(); \
break; \
} \
(void)0; \
})
#define __put_unaligned_be(val, ptr) \
({ \
void *__gu_p = (ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
*(uint8_t *)__gu_p = (uint8_t)(val); \
break; \
case 2: \
put_unaligned_be16((uint16_t)(val), __gu_p); \
break; \
case 4: \
put_unaligned_be32((uint32_t)(val), __gu_p); \
break; \
case 8: \
put_unaligned_be64((uint64_t)(val), __gu_p); \
break; \
default: \
__bad_unaligned_access_size(); \
break; \
} \
(void)0; \
})
#if _LITTLE_ENDIAN
# define get_unaligned __get_unaligned_le
# define put_unaligned __put_unaligned_le
#else
# define get_unaligned __get_unaligned_be
# define put_unaligned __put_unaligned_be
#endif
#endif // ASM_UNALIGNED_H
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