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utils: add little-endian swap helpers

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
This commit is contained in:
Felix Fietkau 2013-02-13 12:35:19 +01:00
parent e5a40544ec
commit d01922625d
1 changed files with 28 additions and 21 deletions
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49
utils.h
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@ -77,17 +77,14 @@ void clock_gettime(int type, struct timespec *tv);
#elif defined(__APPLE__)
#include <machine/endian.h>
#include <machine/byte_order.h>
#define bswap_16(x) OSSwapInt16(x)
#define bswap_32(x) OSSwapInt32(x)
#define bswap_64(x) OSSwapInt64(x)
#elif defined(__FreeBSD__)
#include <sys/endian.h>
#define bswap_16(x) bswap16(x)
#define bswap_32(x) bswap32(x)
#define bswap_64(x) bswap64(x)
#else
#include <machine/endian.h>
#define bswap_16(x) swap16(x)
#define bswap_32(x) swap32(x)
#define bswap_64(x) swap64(x)
#endif
@ -102,34 +99,44 @@ void clock_gettime(int type, struct timespec *tv);
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define __u_bswap16(x) ((uint16_t)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
#if _GNUC_MIN_VER(4, 2)
#define __u_bswap32(x) __builtin_bswap32(x)
#define __u_bswap64(x) __builtin_bswap64(x)
#else
#define __u_bswap32(x) bswap_32(x)
#define __u_bswap64(x) bswap_64(x)
#endif
#define __bswap_constant_16(x) ((uint16_t)((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define cpu_to_be64(x) __builtin_bswap64(x)
#define cpu_to_be32(x) __builtin_bswap32(x)
#define cpu_to_be16(x) __bswap_constant_16((uint16_t) x)
#define cpu_to_be64(x) __u_bswap64(x)
#define cpu_to_be32(x) __u_bswap32(x)
#define cpu_to_be16(x) __u_bswap16((uint16_t) x)
#define be64_to_cpu(x) __builtin_bswap64(x)
#define be32_to_cpu(x) __builtin_bswap32(x)
#define be16_to_cpu(x) __bswap_constant_16((uint16_t) x)
#define be64_to_cpu(x) __u_bswap64(x)
#define be32_to_cpu(x) __u_bswap32(x)
#define be16_to_cpu(x) __u_bswap16((uint16_t) x)
#else /* __GNUC__ */
#define cpu_to_le64(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_le16(x) (x)
#define cpu_to_be64(x) bswap_64(x)
#define cpu_to_be32(x) bswap_32(x)
#define cpu_to_be16(x) bswap_16(x)
#define be64_to_cpu(x) bswap_64(x)
#define be32_to_cpu(x) bswap_32(x)
#define be16_to_cpu(x) bswap_16(x)
#endif /* __GNUC__ */
#define le64_to_cpu(x) (x)
#define le32_to_cpu(x) (x)
#define le16_to_cpu(x) (x)
#else /* __BYTE_ORDER == __LITTLE_ENDIAN */
#define cpu_to_le64(x) __u_bswap64(x)
#define cpu_to_le32(x) __u_bswap32(x)
#define cpu_to_le16(x) __u_bswap16((uint16_t) x)
#define le64_to_cpu(x) __u_bswap64(x)
#define le32_to_cpu(x) __u_bswap32(x)
#define le16_to_cpu(x) __u_bswap16((uint16_t) x)
#define cpu_to_be64(x) (x)
#define cpu_to_be32(x) (x)
#define cpu_to_be16(x) (x)