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xxhash can be included twice in any order

Browse Source 
Previously,

followed by :

would fail to include the static definitions,
because the second include was simply skipped by guard macro.

Now it works as intended :
the missing static part is included during the second include.
This commit is contained in:
Yann Collet 2017-03-01 13:29:29 -08:00
parent 4bcc69b761
commit 76f0494089
1 changed files with 11 additions and 15 deletions
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26
lib/common/xxhash.h
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@ -64,16 +64,12 @@ XXH64 13.8 GB/s 1.9 GB/s
XXH32 6.8 GB/s 6.0 GB/s
*/
#ifndef XXHASH_H_5627135585666179
#define XXHASH_H_5627135585666179 1
#if defined (__cplusplus)
extern "C" {
#endif
#ifndef XXH_NAMESPACE
# define XXH_NAMESPACE ZSTD_ /* Zstandard specific */
#endif
#ifndef XXHASH_H_5627135585666179
#define XXHASH_H_5627135585666179 1
/* ****************************
@ -242,6 +238,11 @@ XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* restrict dst_state, const XXH
/* **************************
* Canonical representation
****************************/
/* Default result type for XXH functions are primitive unsigned 32 and 64 bits.
* The canonical representation uses human-readable write convention, aka big-endian (large digits first).
* These functions allow transformation of hash result into and from its canonical format.
* This way, hash values can be written into a file / memory, and remain comparable on different systems and programs.
*/
typedef struct { unsigned char digest[4]; } XXH32_canonical_t;
typedef struct { unsigned char digest[8]; } XXH64_canonical_t;
@ -251,14 +252,9 @@ XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t
XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src);
XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src);
/* Default result type for XXH functions are primitive unsigned 32 and 64 bits.
* The canonical representation uses human-readable write convention, aka big-endian (large digits first).
* These functions allow transformation of hash result into and from its canonical format.
* This way, hash values can be written into a file / memory, and remain comparable on different systems and programs.
*/
#endif /* XXHASH_H_5627135585666179 */
#ifdef XXH_STATIC_LINKING_ONLY
/* ================================================================================================
This section contains definitions which are not guaranteed to remain stable.
@ -266,6 +262,8 @@ XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src
They shall only be used with static linking.
Never use these definitions in association with dynamic linking !
=================================================================================================== */
#if defined(XXH_STATIC_LINKING_ONLY) && !defined(XXH_STATIC_H_3543687687345)
#define XXH_STATIC_H_3543687687345
/* These definitions are only meant to allow allocation of XXH state
statically, on stack, or in a struct for example.
@ -299,11 +297,9 @@ XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src
# include "xxhash.c" /* include xxhash functions as `static`, for inlining */
# endif
#endif /* XXH_STATIC_LINKING_ONLY */
#endif /* XXH_STATIC_LINKING_ONLY && XXH_STATIC_H_3543687687345 */
#if defined (__cplusplus)
}
#endif
#endif /* XXHASH_H_5627135585666179 */