| 1 | #ifndef HASH_H |
| 2 | #define HASH_H |
| 3 | |
| 4 | #if defined(SHA1_APPLE) |
| 5 | #define SHA1_BACKEND "SHA1_APPLE (No collision detection)" |
| 6 | #include <CommonCrypto/CommonDigest.h> |
| 7 | #elif defined(SHA1_OPENSSL) |
| 8 | # define SHA1_BACKEND "SHA1_OPENSSL (No collision detection)" |
| 9 | # include <openssl/sha.h> |
| 10 | # if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 |
| 11 | # define SHA1_NEEDS_CLONE_HELPER |
| 12 | # include "sha1/openssl.h" |
| 13 | # endif |
| 14 | #elif defined(SHA1_DC) |
| 15 | #define SHA1_BACKEND "SHA1_DC" |
| 16 | #include "sha1dc_git.h" |
| 17 | #else /* SHA1_BLK */ |
| 18 | #define SHA1_BACKEND "SHA1_BLK (No collision detection)" |
| 19 | #include "block-sha1/sha1.h" |
| 20 | #endif |
| 21 | |
| 22 | #if defined(SHA1_APPLE_UNSAFE) |
| 23 | # define SHA1_UNSAFE_BACKEND "SHA1_APPLE_UNSAFE" |
| 24 | # include <CommonCrypto/CommonDigest.h> |
| 25 | # define platform_SHA_CTX_unsafe CC_SHA1_CTX |
| 26 | # define platform_SHA1_Init_unsafe CC_SHA1_Init |
| 27 | # define platform_SHA1_Update_unsafe CC_SHA1_Update |
| 28 | # define platform_SHA1_Final_unsafe CC_SHA1_Final |
| 29 | #elif defined(SHA1_OPENSSL_UNSAFE) |
| 30 | # define SHA1_UNSAFE_BACKEND "SHA1_OPENSSL_UNSAFE" |
| 31 | # include <openssl/sha.h> |
| 32 | # if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 |
| 33 | # define SHA1_NEEDS_CLONE_HELPER_UNSAFE |
| 34 | # include "sha1/openssl.h" |
| 35 | # define platform_SHA_CTX_unsafe openssl_SHA1_CTX |
| 36 | # define platform_SHA1_Init_unsafe openssl_SHA1_Init |
| 37 | # define platform_SHA1_Clone_unsafe openssl_SHA1_Clone |
| 38 | # define platform_SHA1_Update_unsafe openssl_SHA1_Update |
| 39 | # define platform_SHA1_Final_unsafe openssl_SHA1_Final |
| 40 | # else |
| 41 | # define platform_SHA_CTX_unsafe SHA_CTX |
| 42 | # define platform_SHA1_Init_unsafe SHA1_Init |
| 43 | # define platform_SHA1_Update_unsafe SHA1_Update |
| 44 | # define platform_SHA1_Final_unsafe SHA1_Final |
| 45 | # endif |
| 46 | #elif defined(SHA1_BLK_UNSAFE) |
| 47 | # define SHA1_UNSAFE_BACKEND "SHA1_BLK_UNSAFE" |
| 48 | # include "block-sha1/sha1.h" |
| 49 | # define platform_SHA_CTX_unsafe blk_SHA_CTX |
| 50 | # define platform_SHA1_Init_unsafe blk_SHA1_Init |
| 51 | # define platform_SHA1_Update_unsafe blk_SHA1_Update |
| 52 | # define platform_SHA1_Final_unsafe blk_SHA1_Final |
| 53 | #endif |
| 54 | |
| 55 | #if defined(SHA256_NETTLE) |
| 56 | #define SHA256_BACKEND "SHA256_NETTLE" |
| 57 | #include "sha256/nettle.h" |
| 58 | #elif defined(SHA256_GCRYPT) |
| 59 | #define SHA256_BACKEND "SHA256_GCRYPT" |
| 60 | #define SHA256_NEEDS_CLONE_HELPER |
| 61 | #include "sha256/gcrypt.h" |
| 62 | #elif defined(SHA256_OPENSSL) |
| 63 | # define SHA256_BACKEND "SHA256_OPENSSL" |
| 64 | # include <openssl/sha.h> |
| 65 | # if defined(OPENSSL_API_LEVEL) && OPENSSL_API_LEVEL >= 3 |
| 66 | # define SHA256_NEEDS_CLONE_HELPER |
| 67 | # include "sha256/openssl.h" |
| 68 | # endif |
| 69 | #else |
| 70 | #define SHA256_BACKEND "SHA256_BLK" |
| 71 | #include "sha256/block/sha256.h" |
| 72 | #endif |
| 73 | |
| 74 | #ifndef platform_SHA_CTX |
| 75 | /* |
| 76 | * platform's underlying implementation of SHA-1; could be OpenSSL, |
| 77 | * blk_SHA, Apple CommonCrypto, etc... Note that the relevant |
| 78 | * SHA-1 header may have already defined platform_SHA_CTX for our |
| 79 | * own implementations like block-sha1, so we list |
| 80 | * the default for OpenSSL compatible SHA-1 implementations here. |
| 81 | */ |
| 82 | #define platform_SHA_CTX SHA_CTX |
| 83 | #define platform_SHA1_Init SHA1_Init |
| 84 | #define platform_SHA1_Update SHA1_Update |
| 85 | #define platform_SHA1_Final SHA1_Final |
| 86 | #endif |
| 87 | |
| 88 | #ifndef platform_SHA_CTX_unsafe |
| 89 | # define platform_SHA_CTX_unsafe platform_SHA_CTX |
| 90 | # define platform_SHA1_Init_unsafe platform_SHA1_Init |
| 91 | # define platform_SHA1_Update_unsafe platform_SHA1_Update |
| 92 | # define platform_SHA1_Final_unsafe platform_SHA1_Final |
| 93 | # ifdef platform_SHA1_Clone |
| 94 | # define platform_SHA1_Clone_unsafe platform_SHA1_Clone |
| 95 | # endif |
| 96 | # ifdef SHA1_NEEDS_CLONE_HELPER |
| 97 | # define SHA1_NEEDS_CLONE_HELPER_UNSAFE |
| 98 | # endif |
| 99 | #endif |
| 100 | |
| 101 | #define git_SHA_CTX platform_SHA_CTX |
| 102 | #define git_SHA1_Init platform_SHA1_Init |
| 103 | #define git_SHA1_Update platform_SHA1_Update |
| 104 | #define git_SHA1_Final platform_SHA1_Final |
| 105 | |
| 106 | #define git_SHA_CTX_unsafe platform_SHA_CTX_unsafe |
| 107 | #define git_SHA1_Init_unsafe platform_SHA1_Init_unsafe |
| 108 | #define git_SHA1_Update_unsafe platform_SHA1_Update_unsafe |
| 109 | #define git_SHA1_Final_unsafe platform_SHA1_Final_unsafe |
| 110 | |
| 111 | #ifdef platform_SHA1_Clone |
| 112 | #define git_SHA1_Clone platform_SHA1_Clone |
| 113 | #endif |
| 114 | #ifdef platform_SHA1_Clone_unsafe |
| 115 | # define git_SHA1_Clone_unsafe platform_SHA1_Clone_unsafe |
| 116 | #endif |
| 117 | |
| 118 | #ifndef platform_SHA256_CTX |
| 119 | #define platform_SHA256_CTX SHA256_CTX |
| 120 | #define platform_SHA256_Init SHA256_Init |
| 121 | #define platform_SHA256_Update SHA256_Update |
| 122 | #define platform_SHA256_Final SHA256_Final |
| 123 | #endif |
| 124 | |
| 125 | #define git_SHA256_CTX platform_SHA256_CTX |
| 126 | #define git_SHA256_Init platform_SHA256_Init |
| 127 | #define git_SHA256_Update platform_SHA256_Update |
| 128 | #define git_SHA256_Final platform_SHA256_Final |
| 129 | |
| 130 | #ifdef platform_SHA256_Clone |
| 131 | #define git_SHA256_Clone platform_SHA256_Clone |
| 132 | #endif |
| 133 | |
| 134 | #ifdef SHA1_MAX_BLOCK_SIZE |
| 135 | #include "compat/sha1-chunked.h" |
| 136 | #undef git_SHA1_Update |
| 137 | #define git_SHA1_Update git_SHA1_Update_Chunked |
| 138 | #endif |
| 139 | |
| 140 | #ifndef SHA1_NEEDS_CLONE_HELPER |
| 141 | static inline void git_SHA1_Clone(git_SHA_CTX *dst, const git_SHA_CTX *src) |
| 142 | { |
| 143 | memcpy(dst, src, sizeof(*dst)); |
| 144 | } |
| 145 | #endif |
| 146 | #ifndef SHA1_NEEDS_CLONE_HELPER_UNSAFE |
| 147 | static inline void git_SHA1_Clone_unsafe(git_SHA_CTX_unsafe *dst, |
| 148 | const git_SHA_CTX_unsafe *src) |
| 149 | { |
| 150 | memcpy(dst, src, sizeof(*dst)); |
| 151 | } |
| 152 | #endif |
| 153 | |
| 154 | #ifndef SHA256_NEEDS_CLONE_HELPER |
| 155 | static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *src) |
| 156 | { |
| 157 | memcpy(dst, src, sizeof(*dst)); |
| 158 | } |
| 159 | #endif |
| 160 | |
| 161 | /* |
| 162 | * Note that these constants are suitable for indexing the hash_algos array and |
| 163 | * comparing against each other, but are otherwise arbitrary, so they should not |
| 164 | * be exposed to the user or serialized to disk. To know whether a |
| 165 | * git_hash_algo struct points to some usable hash function, test the format_id |
| 166 | * field for being non-zero. Use the name field for user-visible situations and |
| 167 | * the format_id field for fixed-length fields on disk. |
| 168 | */ |
| 169 | /* An unknown hash function. */ |
| 170 | #define GIT_HASH_UNKNOWN 0 |
| 171 | /* SHA-1 */ |
| 172 | #define GIT_HASH_SHA1 1 |
| 173 | /* SHA-256 */ |
| 174 | #define GIT_HASH_SHA256 2 |
| 175 | /* Number of algorithms supported (including unknown). */ |
| 176 | #define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1) |
| 177 | |
| 178 | /* Default hash algorithm if unspecified. */ |
| 179 | #ifdef WITH_BREAKING_CHANGES |
| 180 | # define GIT_HASH_DEFAULT GIT_HASH_SHA256 |
| 181 | #else |
| 182 | # define GIT_HASH_DEFAULT GIT_HASH_SHA1 |
| 183 | #endif |
| 184 | |
| 185 | /* Legacy hash algorithm. Implied for older data formats which don't specify. */ |
| 186 | #define GIT_HASH_SHA1_LEGACY GIT_HASH_SHA1 |
| 187 | |
| 188 | /* "sha1", big-endian */ |
| 189 | #define GIT_SHA1_FORMAT_ID 0x73686131 |
| 190 | |
| 191 | /* The length in bytes and in hex digits of an object name (SHA-1 value). */ |
| 192 | #define GIT_SHA1_RAWSZ 20 |
| 193 | #define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) |
| 194 | /* The block size of SHA-1. */ |
| 195 | #define GIT_SHA1_BLKSZ 64 |
| 196 | |
| 197 | /* "s256", big-endian */ |
| 198 | #define GIT_SHA256_FORMAT_ID 0x73323536 |
| 199 | |
| 200 | /* The length in bytes and in hex digits of an object name (SHA-256 value). */ |
| 201 | #define GIT_SHA256_RAWSZ 32 |
| 202 | #define GIT_SHA256_HEXSZ (2 * GIT_SHA256_RAWSZ) |
| 203 | /* The block size of SHA-256. */ |
| 204 | #define GIT_SHA256_BLKSZ 64 |
| 205 | |
| 206 | /* The length in byte and in hex digits of the largest possible hash value. */ |
| 207 | #define GIT_MAX_RAWSZ GIT_SHA256_RAWSZ |
| 208 | #define GIT_MAX_HEXSZ GIT_SHA256_HEXSZ |
| 209 | /* The largest possible block size for any supported hash. */ |
| 210 | #define GIT_MAX_BLKSZ GIT_SHA256_BLKSZ |
| 211 | |
| 212 | struct object_id { |
| 213 | unsigned char hash[GIT_MAX_RAWSZ]; |
| 214 | uint32_t algo; /* XXX requires 4-byte alignment */ |
| 215 | }; |
| 216 | |
| 217 | #define GET_OID_QUIETLY 01 |
| 218 | #define GET_OID_COMMIT 02 |
| 219 | #define GET_OID_COMMITTISH 04 |
| 220 | #define GET_OID_TREE 010 |
| 221 | #define GET_OID_TREEISH 020 |
| 222 | #define GET_OID_BLOB 040 |
| 223 | #define GET_OID_FOLLOW_SYMLINKS 0100 |
| 224 | #define GET_OID_RECORD_PATH 0200 |
| 225 | #define GET_OID_ONLY_TO_DIE 04000 |
| 226 | #define GET_OID_REQUIRE_PATH 010000 |
| 227 | #define GET_OID_HASH_ANY 020000 |
| 228 | #define GET_OID_SKIP_AMBIGUITY_CHECK 040000 |
| 229 | #define GET_OID_GENTLY 0100000 |
| 230 | |
| 231 | #define GET_OID_DISAMBIGUATORS \ |
| 232 | (GET_OID_COMMIT | GET_OID_COMMITTISH | \ |
| 233 | GET_OID_TREE | GET_OID_TREEISH | \ |
| 234 | GET_OID_BLOB) |
| 235 | |
| 236 | enum get_oid_result { |
| 237 | FOUND = 0, |
| 238 | MISSING_OBJECT = -1, /* The requested object is missing */ |
| 239 | SHORT_NAME_AMBIGUOUS = -2, |
| 240 | /* The following only apply when symlinks are followed */ |
| 241 | DANGLING_SYMLINK = -4, /* |
| 242 | * The initial symlink is there, but |
| 243 | * (transitively) points to a missing |
| 244 | * in-tree file |
| 245 | */ |
| 246 | SYMLINK_LOOP = -5, |
| 247 | NOT_DIR = -6, /* |
| 248 | * Somewhere along the symlink chain, a path is |
| 249 | * requested which contains a file as a |
| 250 | * non-final element. |
| 251 | */ |
| 252 | }; |
| 253 | |
| 254 | #ifdef USE_THE_REPOSITORY_VARIABLE |
| 255 | # include "repository.h" |
| 256 | # define the_hash_algo the_repository->hash_algo |
| 257 | #endif |
| 258 | |
| 259 | /* A suitably aligned type for stack allocations of hash contexts. */ |
| 260 | struct git_hash_ctx { |
| 261 | const struct git_hash_algo *algop; |
| 262 | union { |
| 263 | git_SHA_CTX sha1; |
| 264 | git_SHA_CTX_unsafe sha1_unsafe; |
| 265 | git_SHA256_CTX sha256; |
| 266 | } state; |
| 267 | }; |
| 268 | |
| 269 | typedef void (*git_hash_init_fn)(struct git_hash_ctx *ctx); |
| 270 | typedef void (*git_hash_clone_fn)(struct git_hash_ctx *dst, const struct git_hash_ctx *src); |
| 271 | typedef void (*git_hash_update_fn)(struct git_hash_ctx *ctx, const void *in, size_t len); |
| 272 | typedef void (*git_hash_final_fn)(unsigned char *hash, struct git_hash_ctx *ctx); |
| 273 | typedef void (*git_hash_final_oid_fn)(struct object_id *oid, struct git_hash_ctx *ctx); |
| 274 | |
| 275 | struct git_hash_algo { |
| 276 | /* |
| 277 | * The name of the algorithm, as appears in the config file and in |
| 278 | * messages. |
| 279 | */ |
| 280 | const char *name; |
| 281 | |
| 282 | /* A four-byte version identifier, used in pack indices. */ |
| 283 | uint32_t format_id; |
| 284 | |
| 285 | /* The length of the hash in binary. */ |
| 286 | size_t rawsz; |
| 287 | |
| 288 | /* The length of the hash in hex characters. */ |
| 289 | size_t hexsz; |
| 290 | |
| 291 | /* The block size of the hash. */ |
| 292 | size_t blksz; |
| 293 | |
| 294 | /* The hash initialization function. */ |
| 295 | git_hash_init_fn init_fn; |
| 296 | |
| 297 | /* The hash context cloning function. */ |
| 298 | git_hash_clone_fn clone_fn; |
| 299 | |
| 300 | /* The hash update function. */ |
| 301 | git_hash_update_fn update_fn; |
| 302 | |
| 303 | /* The hash finalization function. */ |
| 304 | git_hash_final_fn final_fn; |
| 305 | |
| 306 | /* The hash finalization function for object IDs. */ |
| 307 | git_hash_final_oid_fn final_oid_fn; |
| 308 | |
| 309 | /* The OID of the empty tree. */ |
| 310 | const struct object_id *empty_tree; |
| 311 | |
| 312 | /* The OID of the empty blob. */ |
| 313 | const struct object_id *empty_blob; |
| 314 | |
| 315 | /* The all-zeros OID. */ |
| 316 | const struct object_id *null_oid; |
| 317 | |
| 318 | /* The unsafe variant of this hash function, if one exists. */ |
| 319 | const struct git_hash_algo *unsafe; |
| 320 | }; |
| 321 | extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS]; |
| 322 | |
| 323 | void git_hash_init(struct git_hash_ctx *ctx, const struct git_hash_algo *algop); |
| 324 | void git_hash_clone(struct git_hash_ctx *dst, const struct git_hash_ctx *src); |
| 325 | void git_hash_update(struct git_hash_ctx *ctx, const void *in, size_t len); |
| 326 | void git_hash_final(unsigned char *hash, struct git_hash_ctx *ctx); |
| 327 | void git_hash_final_oid(struct object_id *oid, struct git_hash_ctx *ctx); |
| 328 | const struct git_hash_algo *hash_algo_ptr_by_number(uint32_t algo); |
| 329 | struct git_hash_ctx *git_hash_alloc(void); |
| 330 | void git_hash_free(struct git_hash_ctx *ctx); |
| 331 | /* |
| 332 | * Return a GIT_HASH_* constant based on the name. Returns GIT_HASH_UNKNOWN if |
| 333 | * the name doesn't match a known algorithm. |
| 334 | */ |
| 335 | uint32_t hash_algo_by_name(const char *name); |
| 336 | /* Identical, except based on the format ID. */ |
| 337 | uint32_t hash_algo_by_id(uint32_t format_id); |
| 338 | /* Identical, except based on the length. */ |
| 339 | uint32_t hash_algo_by_length(size_t len); |
| 340 | /* Identical, except for a pointer to struct git_hash_algo. */ |
| 341 | static inline uint32_t hash_algo_by_ptr(const struct git_hash_algo *p) |
| 342 | { |
| 343 | size_t i; |
| 344 | for (i = 0; i < GIT_HASH_NALGOS; i++) { |
| 345 | const struct git_hash_algo *algop = &hash_algos[i]; |
| 346 | if (p == algop) |
| 347 | return i; |
| 348 | } |
| 349 | return GIT_HASH_UNKNOWN; |
| 350 | } |
| 351 | |
| 352 | const struct git_hash_algo *unsafe_hash_algo(const struct git_hash_algo *algop); |
| 353 | |
| 354 | const struct object_id *null_oid(const struct git_hash_algo *algop); |
| 355 | |
| 356 | static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2, const struct git_hash_algo *algop) |
| 357 | { |
| 358 | /* |
| 359 | * Teach the compiler that there are only two possibilities of hash size |
| 360 | * here, so that it can optimize for this case as much as possible. |
| 361 | */ |
| 362 | if (algop->rawsz == GIT_MAX_RAWSZ) |
| 363 | return memcmp(sha1, sha2, GIT_MAX_RAWSZ); |
| 364 | return memcmp(sha1, sha2, GIT_SHA1_RAWSZ); |
| 365 | } |
| 366 | |
| 367 | static inline int hasheq(const unsigned char *sha1, const unsigned char *sha2, const struct git_hash_algo *algop) |
| 368 | { |
| 369 | /* |
| 370 | * We write this here instead of deferring to hashcmp so that the |
| 371 | * compiler can properly inline it and avoid calling memcmp. |
| 372 | */ |
| 373 | if (algop->rawsz == GIT_MAX_RAWSZ) |
| 374 | return !memcmp(sha1, sha2, GIT_MAX_RAWSZ); |
| 375 | return !memcmp(sha1, sha2, GIT_SHA1_RAWSZ); |
| 376 | } |
| 377 | |
| 378 | static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src, |
| 379 | const struct git_hash_algo *algop) |
| 380 | { |
| 381 | memcpy(sha_dst, sha_src, algop->rawsz); |
| 382 | } |
| 383 | |
| 384 | static inline void hashclr(unsigned char *hash, const struct git_hash_algo *algop) |
| 385 | { |
| 386 | memset(hash, 0, algop->rawsz); |
| 387 | } |
| 388 | |
| 389 | static inline int oidcmp(const struct object_id *oid1, const struct object_id *oid2) |
| 390 | { |
| 391 | return memcmp(oid1->hash, oid2->hash, GIT_MAX_RAWSZ); |
| 392 | } |
| 393 | |
| 394 | static inline int oideq(const struct object_id *oid1, const struct object_id *oid2) |
| 395 | { |
| 396 | return !memcmp(oid1->hash, oid2->hash, GIT_MAX_RAWSZ); |
| 397 | } |
| 398 | |
| 399 | unsigned oid_common_prefix_hexlen(const struct object_id *a, |
| 400 | const struct object_id *b); |
| 401 | |
| 402 | static inline void oidcpy(struct object_id *dst, const struct object_id *src) |
| 403 | { |
| 404 | memcpy(dst->hash, src->hash, GIT_MAX_RAWSZ); |
| 405 | dst->algo = src->algo; |
| 406 | } |
| 407 | |
| 408 | static inline void oidread(struct object_id *oid, const unsigned char *hash, |
| 409 | const struct git_hash_algo *algop) |
| 410 | { |
| 411 | memcpy(oid->hash, hash, algop->rawsz); |
| 412 | if (algop->rawsz < GIT_MAX_RAWSZ) |
| 413 | memset(oid->hash + algop->rawsz, 0, GIT_MAX_RAWSZ - algop->rawsz); |
| 414 | oid->algo = hash_algo_by_ptr(algop); |
| 415 | } |
| 416 | |
| 417 | static inline void oidclr(struct object_id *oid, |
| 418 | const struct git_hash_algo *algop) |
| 419 | { |
| 420 | memset(oid->hash, 0, GIT_MAX_RAWSZ); |
| 421 | oid->algo = hash_algo_by_ptr(algop); |
| 422 | } |
| 423 | |
| 424 | static inline struct object_id *oiddup(const struct object_id *src) |
| 425 | { |
| 426 | struct object_id *dst = xmalloc(sizeof(struct object_id)); |
| 427 | oidcpy(dst, src); |
| 428 | return dst; |
| 429 | } |
| 430 | |
| 431 | static inline void oid_set_algo(struct object_id *oid, const struct git_hash_algo *algop) |
| 432 | { |
| 433 | oid->algo = hash_algo_by_ptr(algop); |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * Converts a cryptographic hash (e.g. SHA-1) into an int-sized hash code |
| 438 | * for use in hash tables. Cryptographic hashes are supposed to have |
| 439 | * uniform distribution, so in contrast to `memhash()`, this just copies |
| 440 | * the first `sizeof(int)` bytes without shuffling any bits. Note that |
| 441 | * the results will be different on big-endian and little-endian |
| 442 | * platforms, so they should not be stored or transferred over the net. |
| 443 | */ |
| 444 | static inline unsigned int oidhash(const struct object_id *oid) |
| 445 | { |
| 446 | /* |
| 447 | * Equivalent to 'return *(unsigned int *)oid->hash;', but safe on |
| 448 | * platforms that don't support unaligned reads. |
| 449 | */ |
| 450 | unsigned int hash; |
| 451 | memcpy(&hash, oid->hash, sizeof(hash)); |
| 452 | return hash; |
| 453 | } |
| 454 | |
| 455 | static inline int is_null_oid(const struct object_id *oid) |
| 456 | { |
| 457 | static const unsigned char null_hash[GIT_MAX_RAWSZ]; |
| 458 | return !memcmp(oid->hash, null_hash, GIT_MAX_RAWSZ); |
| 459 | } |
| 460 | |
| 461 | const char *empty_tree_oid_hex(const struct git_hash_algo *algop); |
| 462 | |
| 463 | static inline int is_empty_blob_oid(const struct object_id *oid, |
| 464 | const struct git_hash_algo *algop) |
| 465 | { |
| 466 | return oideq(oid, algop->empty_blob); |
| 467 | } |
| 468 | |
| 469 | static inline int is_empty_tree_oid(const struct object_id *oid, |
| 470 | const struct git_hash_algo *algop) |
| 471 | { |
| 472 | return oideq(oid, algop->empty_tree); |
| 473 | } |
| 474 | |
| 475 | #endif |