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#ifndef BSWAP_H
#define BSWAP_H
#if defined(__cplusplus)
extern "C" {
#endif
#if !(defined(ARCH_BIG_ENDIAN) || defined(ARCH_LITTLE_ENDIAN))
#error "ARCH_BIG_ENDIAN or ARCH_LITTLE_ENDIAN not set."
#endif
#if defined(ARCH_BIG_ENDIAN) && defined(ARCH_LITTLE_ENDIAN)
#error "ARCH_BIG_ENDIAN and ARCH_LITTLE_ENDIAN are both set."
#endif
#define BSWAP_16(x) \
(uint16_t)((((x) & 0xFF00) >> 8) | (((x) & 0x00FF) << 8))
#define BSWAP_32(x) \
(uint32_t)((((x) & 0xFF000000UL) >> 24UL) | \
(((x) & 0x00FF0000UL) >> 8UL) | \
(((x) & 0x0000FF00UL) << 8UL) | \
(((x) & 0x000000FFUL) << 24UL))
#if defined(ARCH_BIG_ENDIAN)
#define le16_to_cpu(x) bswap_16(x)
#define le32_to_cpu(x) bswap_32(x)
#define be16_to_cpu(x) (x)
#define be32_to_cpu(x) (x)
#define cpu_to_le16(x) bswap_16(x)
#define cpu_to_le32(x) bswap_32(x)
#define cpu_to_be16(x) (x)
#define cpu_to_be32(x) (x)
#define LE16_TO_CPU(x) BSWAP_16(x)
#define LE32_TO_CPU(x) BSWAP_32(x)
#define BE16_TO_CPU(x) (x)
#define BE32_TO_CPU(x) (x)
#define CPU_TO_LE16(x) BSWAP_16(x)
#define CPU_TO_LE32(x) BSWAP_32(x)
#define CPU_TO_BE16(x) (x)
#define CPU_TO_BE32(x) (x)
#endif
#if defined(ARCH_LITTLE_ENDIAN)
#define le16_to_cpu(x) (x)
#define le32_to_cpu(x) (x)
#define be16_to_cpu(x) bswap_16(x)
#define be32_to_cpu(x) bswap_32(x)
#define cpu_to_le16(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_be16(x) bswap_16(x)
#define cpu_to_be32(x) bswap_32(x)
#define LE16_TO_CPU(x) (x)
#define LE32_TO_CPU(x) (x)
#define BE16_TO_CPU(x) BSWAP_16(x)
#define BE32_TO_CPU(x) BSWAP_32(x)
#define CPU_TO_LE16(x) (x)
#define CPU_TO_LE32(x) (x)
#define CPU_TO_BE16(x) BSWAP_16(x)
#define CPU_TO_BE32(x) BSWAP_32(x)
#endif
static inline uint16_t bswap_16(const uint16_t x)
__attribute__ ((warn_unused_result))
__attribute__ ((const))
__attribute__ ((always_inline));
static inline uint16_t bswap_16(const uint16_t x) {
if (__builtin_constant_p(x))
return BSWAP_16(x);
uint8_t tmp;
union { uint16_t x; uint8_t b[2]; } data;
data.x = x;
tmp = data.b[0];
data.b[0] = data.b[1];
data.b[1] = tmp;
return data.x;
}
static inline uint32_t bswap_32(const uint32_t x)
__attribute__ ((warn_unused_result))
__attribute__ ((const))
__attribute__ ((always_inline));
static inline uint32_t bswap_32(const uint32_t x) {
if (__builtin_constant_p(x))
return BSWAP_32(x);
uint8_t tmp;
union { uint32_t x; uint8_t b[4]; } data;
data.x = x;
tmp = data.b[0];
data.b[0] = data.b[3];
data.b[3] = tmp;
tmp = data.b[1];
data.b[1] = data.b[2];
data.b[2] = tmp;
return data.x;
}
static inline void bswap_n(void* const data, uint8_t len)
__attribute__ ((nonnull (1)));
static inline void bswap_n(void* const data, uint8_t len) {
uint8_t* ptr = (uint8_t*)data;
for ( ; len > 1 ; ptr++, len -= 2 ) {
uint8_t tmp = *ptr;
*ptr = *(ptr + len - 1);
*(ptr + len - 1) = tmp;
}
}
#if defined(__cplusplus)
}
#endif
#endif
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