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git://jb55.com/damus
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207 lines
5.2 KiB
C
207 lines
5.2 KiB
C
#ifndef PENDIAN_H
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#define PENDIAN_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Defines platform optimized (as per linux <endian.h>
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*
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* le16toh, le32to, le64toh, be16toh, be32toh, be64toh
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* htole16, htole32, htole64, htobe16, htobe32, htobe64
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*
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* Falls back to auto-detect endian conversion which is also fast
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* if fast byteswap operation was detected.
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*
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* Also defines platform optimized:
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*
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* bswap16, bswap32, bswap64,
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*
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* with fall-back to shift-or implementation.
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*
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* For convenience also defines:
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*
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* le8to, be8toh, htole8, htobe8
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* bswap8
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*
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* The convience functions makes is simpler to define conversion macros
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* based on type size.
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*
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* NOTE: this implementation expects arguments with no side-effects and
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* with appropriately sized unsigned arguments. These are expected to be
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* used with typesafe wrappers.
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*/
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#ifndef UINT8_MAX
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#include "pstdint.h"
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#endif
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#if defined(__linux__)
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#include <endian.h>
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#elif defined(__OpenBSD__) || defined(__FreeBSD__)
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#include <sys/endian.h>
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#endif
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#include "pendian_detect.h"
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#if defined(_MSC_VER)
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#if _MSC_VER >= 1300
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#include <stdlib.h>
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#define bswap16 _byteswap_ushort
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#define bswap32 _byteswap_ulong
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#define bswap64 _byteswap_uint64
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#endif
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#elif defined(__clang__)
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#if __has_builtin(__builtin_bswap16)
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#ifndef bswap16
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#define bswap16 __builtin_bswap16
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#endif
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#endif
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#if __has_builtin(__builtin_bswap32)
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#ifndef bswap32
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#define bswap32 __builtin_bswap32
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#endif
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#endif
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#if __has_builtin(__builtin_bswap64)
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#ifndef bswap64
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#define bswap64 __builtin_bswap64
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#endif
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#endif
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#elif defined(__OpenBSD__) || defined(__FreeBSD__)
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#ifndef bswap16
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#define bswap16 swap16
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#endif
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#ifndef bswap32
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#define bswap32 swap32
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#endif
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#ifndef bswap64
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#define bswap64 swap64
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#endif
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#elif defined(__GNUC__) /* Supported since at least GCC 4.4 */
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#ifndef bswap32
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#define bswap32 __builtin_bswap32
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#endif
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#ifndef bswap64
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#define bswap64 __builtin_bswap64
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#endif
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#endif
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#ifndef bswap16
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#define bswap16(v) \
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(((uint16_t)(v) << 8) | ((uint16_t)(v) >> 8))
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#endif
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#ifndef bswap32
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#define bswap32(v) \
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((((uint32_t)(v) << 24)) \
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| (((uint32_t)(v) << 8) & UINT32_C(0x00FF0000)) \
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| (((uint32_t)(v) >> 8) & UINT32_C(0x0000FF00)) \
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| (((uint32_t)(v) >> 24)))
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#endif
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#ifndef bswap64
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#define bswap64(v) \
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((((uint64_t)(v) << 56)) \
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| (((uint64_t)(v) << 40) & UINT64_C(0x00FF000000000000)) \
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| (((uint64_t)(v) << 24) & UINT64_C(0x0000FF0000000000)) \
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| (((uint64_t)(v) << 8) & UINT64_C(0x000000FF00000000)) \
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| (((uint64_t)(v) >> 8) & UINT64_C(0x00000000FF000000)) \
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| (((uint64_t)(v) >> 24) & UINT64_C(0x0000000000FF0000)) \
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| (((uint64_t)(v) >> 40) & UINT64_C(0x000000000000FF00)) \
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| (((uint64_t)(v) >> 56)))
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#endif
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#ifndef bswap8
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#define bswap8(v) ((uint8_t)(v))
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#endif
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#if !defined(le16toh) && defined(letoh16)
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#define le16toh letoh16
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#define le32toh letoh32
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#define le64toh letoh64
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#endif
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#if !defined(be16toh) && defined(betoh16)
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#define be16toh betoh16
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#define be32toh betoh32
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#define be64toh betoh64
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#endif
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/* Assume it goes for all. */
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#if !defined(le16toh)
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#if defined(__LITTLE_ENDIAN__)
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#define le16toh(v) (v)
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#define le32toh(v) (v)
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#define le64toh(v) (v)
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#define htole16(v) (v)
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#define htole32(v) (v)
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#define htole64(v) (v)
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#define be16toh(v) bswap16(v)
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#define be32toh(v) bswap32(v)
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#define be64toh(v) bswap64(v)
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#define htobe16(v) bswap16(v)
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#define htobe32(v) bswap32(v)
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#define htobe64(v) bswap64(v)
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#elif defined(__BIG_ENDIAN__)
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#define le16toh(v) bswap16(v)
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#define le32toh(v) bswap32(v)
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#define le64toh(v) bswap64(v)
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#define htole16(v) bswap16(v)
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#define htole32(v) bswap32(v)
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#define htole64(v) bswap64(v)
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#define be16toh(v) (v)
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#define be32toh(v) (v)
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#define be64toh(v) (v)
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#define htobe16(v) (v)
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#define htobe32(v) (v)
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#define htobe64(v) (v)
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#else
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static const int __pendian_test = 1;
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#define le16toh(v) (*(char *)&__pendian_test ? (v) : bswap16(v))
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#define le32toh(v) (*(char *)&__pendian_test ? (v) : bswap32(v))
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#define le64toh(v) (*(char *)&__pendian_test ? (v) : bswap64(v))
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#define htole16(v) (*(char *)&__pendian_test ? (v) : bswap16(v))
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#define htole32(v) (*(char *)&__pendian_test ? (v) : bswap32(v))
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#define htole64(v) (*(char *)&__pendian_test ? (v) : bswap64(v))
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#define be16toh(v) (*(char *)&__pendian_test ? bswap16(v) : (v))
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#define be32toh(v) (*(char *)&__pendian_test ? bswap32(v) : (v))
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#define be64toh(v) (*(char *)&__pendian_test ? bswap64(v) : (v))
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#define htobe16(v) (*(char *)&__pendian_test ? bswap16(v) : (v))
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#define htobe32(v) (*(char *)&__pendian_test ? bswap32(v) : (v))
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#define htobe64(v) (*(char *)&__pendian_test ? bswap64(v) : (v))
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#endif
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#endif /* le16toh */
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/* Helpers not part of Linux <endian.h> */
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#if !defined(le8toh)
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#define le8toh(n) (n)
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#define htole8(n) (n)
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#define be8toh(n) (n)
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#define htobe8(n) (n)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* PENDIAN_H */
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