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Diffstat (limited to 'include/libHX/endian.h')
| -rw-r--r-- | include/libHX/endian.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/include/libHX/endian.h b/include/libHX/endian.h new file mode 100644 index 0000000..b1a4b6a --- /dev/null +++ b/include/libHX/endian.h @@ -0,0 +1,202 @@ +#ifndef _LIBHX_ENDIAN_H +#define _LIBHX_ENDIAN_H 1 +/* + * See <https://commandcenter.blogspot.com/2012/04/byte-order-fallacy.html>. + * + * be16p_to_cpu not optimized on LE before gcc-10. + * le16p_to_cpu not optimized away on LE before gcc-10. + * cpu_to_be{16,32,64}p not optimized on LE before gcc-8. + * cpu_to_le{16,32,64}p not optimized away on LE before gcc-8. + * cpu_to_le{16,32,64} not optimized away on LE before gcc-8. + * cpu_to_be16 not optimized on LE before gcc-9. + * cpu_to_be{32,64} not optimized on LE before gcc-8. + * be64_to_cpu not optimized on LE before gcc-10. + */ +#include <stdint.h> +#ifndef LIBHX_DBG_INLINE +# define LIBHX_DBG_INLINE static inline +#endif +#if !defined(LIBHX_OPT_O2) && defined(__GNUC__) && !defined(__clang__) && !defined(__llvm__) +# define LIBHX_OPT_O2 __attribute__((optimize("-O2"))) +#else +# define LIBHX_OPT_O2 +#endif +#ifdef __cplusplus +extern "C" { +#endif + +LIBHX_DBG_INLINE uint16_t LIBHX_OPT_O2 be16p_to_cpu(const void *p) +{ + const uint8_t *q = (const uint8_t *)p; + typedef uint16_t T; + return (T)q[1] | ((T)q[0] << 8); +} + +LIBHX_DBG_INLINE uint16_t LIBHX_OPT_O2 le16p_to_cpu(const void *p) +{ + const uint8_t *q = (const uint8_t *)p; + typedef uint16_t T; + return (T)q[0] | ((T)q[1] << 8); +} + +LIBHX_DBG_INLINE uint32_t LIBHX_OPT_O2 be32p_to_cpu(const void *p) +{ + const uint8_t *q = (const uint8_t *)p; + typedef uint32_t T; + return (T)q[3] | ((T)q[2] << 8) | ((T)q[1] << 16) | ((T)q[0] << 24); +} + +LIBHX_DBG_INLINE uint32_t LIBHX_OPT_O2 le32p_to_cpu(const void *p) +{ + const uint8_t *q = (const uint8_t *)p; + typedef uint32_t T; + return (T)q[0] | ((T)q[1] << 8) | ((T)q[2] << 16) | ((T)q[3] << 24); +} + +LIBHX_DBG_INLINE uint64_t LIBHX_OPT_O2 be64p_to_cpu(const void *p) +{ + const uint8_t *q = (const uint8_t *)p; + typedef uint64_t T; + return (T)q[7] | ((T)q[6] << 8) | ((T)q[5] << 16) | ((T)q[4] << 24) | ((T)q[3] << 32) | + ((T)q[2] << 40) | ((T)q[1] << 48) | ((T)q[0] << 56); +} + +LIBHX_DBG_INLINE uint64_t LIBHX_OPT_O2 le64p_to_cpu(const void *p) +{ + const uint8_t *q = (const uint8_t *)p; + typedef uint64_t T; + return (T)q[0] | ((T)q[1] << 8) | ((T)q[2] << 16) | ((T)q[3] << 24) | ((T)q[4] << 32) | + ((T)q[5] << 40) | ((T)q[6] << 48) | ((T)q[7] << 56); +} + +LIBHX_DBG_INLINE void LIBHX_OPT_O2 cpu_to_be16p(void *p, uint16_t v) +{ + uint8_t *q = (uint8_t *)p; + q[1] = v; + q[0] = v >> 8; +} + +LIBHX_DBG_INLINE void LIBHX_OPT_O2 cpu_to_le16p(void *p, uint16_t v) +{ + uint8_t *q = (uint8_t *)p; + q[0] = v; + q[1] = v >> 8; +} + +LIBHX_DBG_INLINE void LIBHX_OPT_O2 cpu_to_be32p(void *p, uint32_t v) +{ + uint8_t *q = (uint8_t *)p; + q[3] = v; + q[2] = v >> 8; + q[1] = v >> 16; + q[0] = v >> 24; +} + +LIBHX_DBG_INLINE void LIBHX_OPT_O2 cpu_to_le32p(void *p, uint32_t v) +{ + uint8_t *q = (uint8_t *)p; + q[0] = v; + q[1] = v >> 8; + q[2] = v >> 16; + q[3] = v >> 24; +} + +LIBHX_DBG_INLINE void LIBHX_OPT_O2 cpu_to_be64p(void *p, uint64_t v) +{ + uint8_t *q = (uint8_t *)p; + q[7] = v; + q[6] = v >> 8; + q[5] = v >> 16; + q[4] = v >> 24; + q[3] = v >> 32; + q[2] = v >> 40; + q[1] = v >> 48; + q[0] = v >> 56; +} + +LIBHX_DBG_INLINE void LIBHX_OPT_O2 cpu_to_le64p(void *p, uint64_t v) +{ + uint8_t *q = (uint8_t *)p; + q[0] = v; + q[1] = v >> 8; + q[2] = v >> 16; + q[3] = v >> 24; + q[4] = v >> 32; + q[5] = v >> 40; + q[6] = v >> 48; + q[7] = v >> 56; +} + +/* This is in essence the same as htons/htonl/htonll/htonq */ +/* [Do we need to worry about trap representations?] */ +LIBHX_DBG_INLINE uint16_t LIBHX_OPT_O2 be16_to_cpu(uint16_t v) +{ + return be16p_to_cpu(&v); +} + +LIBHX_DBG_INLINE uint32_t LIBHX_OPT_O2 be32_to_cpu(uint32_t v) +{ + return be32p_to_cpu(&v); +} + +LIBHX_DBG_INLINE uint64_t LIBHX_OPT_O2 be64_to_cpu(uint64_t v) +{ + return be64p_to_cpu(&v); +} + +LIBHX_DBG_INLINE uint16_t LIBHX_OPT_O2 le16_to_cpu(uint16_t v) +{ + return le16p_to_cpu(&v); +} + +LIBHX_DBG_INLINE uint32_t LIBHX_OPT_O2 le32_to_cpu(uint32_t v) +{ + return le32p_to_cpu(&v); +} + +LIBHX_DBG_INLINE uint64_t LIBHX_OPT_O2 le64_to_cpu(uint64_t v) +{ + return le64p_to_cpu(&v); +} + +LIBHX_DBG_INLINE uint16_t LIBHX_OPT_O2 cpu_to_be16(uint16_t v) +{ + cpu_to_be16p(&v, v); + return v; +} + +LIBHX_DBG_INLINE uint32_t LIBHX_OPT_O2 cpu_to_be32(uint32_t v) +{ + cpu_to_be32p(&v, v); + return v; +} + +LIBHX_DBG_INLINE uint64_t LIBHX_OPT_O2 cpu_to_be64(uint64_t v) +{ + cpu_to_be64p(&v, v); + return v; +} + +LIBHX_DBG_INLINE uint16_t LIBHX_OPT_O2 cpu_to_le16(uint16_t v) +{ + cpu_to_le16p(&v, v); + return v; +} + +LIBHX_DBG_INLINE uint32_t LIBHX_OPT_O2 cpu_to_le32(uint32_t v) +{ + cpu_to_le32p(&v, v); + return v; +} + +LIBHX_DBG_INLINE uint64_t LIBHX_OPT_O2 cpu_to_le64(uint64_t v) +{ + cpu_to_le64p(&v, v); + return v; +} + +#ifdef __cplusplus +} +#endif + +#endif /* _LIBHX_ENDIAN_H */ |