diff options
Diffstat (limited to 'hash-ll.h')
| -rw-r--r-- | hash-ll.h | 37 |
1 files changed, 35 insertions, 2 deletions
@@ -4,7 +4,11 @@ #if defined(SHA1_APPLE) #include <CommonCrypto/CommonDigest.h> #elif defined(SHA1_OPENSSL) -#include <openssl/sha.h> +# include <openssl/sha.h> +# if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 +# define SHA1_NEEDS_CLONE_HELPER +# include "sha1/openssl.h" +# endif #elif defined(SHA1_DC) #include "sha1dc_git.h" #else /* SHA1_BLK */ @@ -17,7 +21,11 @@ #define SHA256_NEEDS_CLONE_HELPER #include "sha256/gcrypt.h" #elif defined(SHA256_OPENSSL) -#include <openssl/sha.h> +# include <openssl/sha.h> +# if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 +# define SHA256_NEEDS_CLONE_HELPER +# include "sha256/openssl.h" +# endif #else #include "sha256/block/sha256.h" #endif @@ -41,6 +49,10 @@ #define git_SHA1_Update platform_SHA1_Update #define git_SHA1_Final platform_SHA1_Final +#ifdef platform_SHA1_Clone +#define git_SHA1_Clone platform_SHA1_Clone +#endif + #ifndef platform_SHA256_CTX #define platform_SHA256_CTX SHA256_CTX #define platform_SHA256_Init SHA256_Init @@ -63,10 +75,12 @@ #define git_SHA1_Update git_SHA1_Update_Chunked #endif +#ifndef SHA1_NEEDS_CLONE_HELPER static inline void git_SHA1_Clone(git_SHA_CTX *dst, const git_SHA_CTX *src) { memcpy(dst, src, sizeof(*dst)); } +#endif #ifndef SHA256_NEEDS_CLONE_HELPER static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *src) @@ -270,6 +284,25 @@ static inline void oid_set_algo(struct object_id *oid, const struct git_hash_alg oid->algo = hash_algo_by_ptr(algop); } +/* + * Converts a cryptographic hash (e.g. SHA-1) into an int-sized hash code + * for use in hash tables. Cryptographic hashes are supposed to have + * uniform distribution, so in contrast to `memhash()`, this just copies + * the first `sizeof(int)` bytes without shuffling any bits. Note that + * the results will be different on big-endian and little-endian + * platforms, so they should not be stored or transferred over the net. + */ +static inline unsigned int oidhash(const struct object_id *oid) +{ + /* + * Equivalent to 'return *(unsigned int *)oid->hash;', but safe on + * platforms that don't support unaligned reads. + */ + unsigned int hash; + memcpy(&hash, oid->hash, sizeof(hash)); + return hash; +} + const char *empty_tree_oid_hex(void); const char *empty_blob_oid_hex(void); |