diff options
| -rw-r--r-- | src/git/odb.h | 14 | ||||
| -rw-r--r-- | src/odb.c | 42 | ||||
| -rw-r--r-- | tests/t0000-obj-hash.c | 423 |
3 files changed, 479 insertions, 0 deletions
diff --git a/src/git/odb.h b/src/git/odb.h index e8b17444a..0a7ee40d3 100644 --- a/src/git/odb.h +++ b/src/git/odb.h @@ -138,6 +138,20 @@ GIT_EXTERN(git_otype) git_obj_string_to_type(const char *str); */ GIT_EXTERN(int) git_obj__loose_object_type(git_otype type); +/** + * Determine the object-ID (sha1 hash) of the given git_obj. + * + * The input obj must be a valid loose object type and the data + * pointer must not be NULL, unless the len field is also zero. + * + * @param id the resulting object-ID. + * @param obj the object whose hash is to be determined. + * @return + * - GIT_SUCCESS if the object-ID was correctly determined. + * - GIT_ERROR if the given object is malformed. + */ +GIT_EXTERN(int) git_obj_hash(git_oid *id, git_obj *obj); + /** @} */ GIT_END_DECL #endif @@ -27,6 +27,8 @@ #include "git/zlib.h" #include "common.h" #include "fileops.h" +#include "hash.h" +#include <stdio.h> struct git_odb { /** Path to the "objects" directory. */ @@ -83,6 +85,46 @@ int git_obj__loose_object_type(git_otype type) return obj_type_table[type].loose; } +static int format_object_header(char *hdr, size_t n, git_obj *obj) +{ + const char *type_str = git_obj_type_to_string(obj->type); + int len = snprintf(hdr, n, "%s %u", type_str, obj->len); + + assert(len > 0); /* otherwise snprintf() is broken */ + assert(len < n); /* otherwise the caller is broken! */ + + if (len < 0 || len >= n) + return GIT_ERROR; + return len+1; +} + +int git_obj_hash(git_oid *id, git_obj *obj) +{ + git_buf_vec vec[2]; + char hdr[64]; + int hdrlen; + + assert(id && obj); + + if (!git_obj__loose_object_type(obj->type)) + return GIT_ERROR; + + if (!obj->data && obj->len != 0) + return GIT_ERROR; + + if ((hdrlen = format_object_header(hdr, sizeof(hdr), obj)) < 0) + return GIT_ERROR; + + vec[0].data = hdr; + vec[0].len = hdrlen; + vec[1].data = obj->data; + vec[1].len = obj->len; + + git_hash_vec(id, vec, 2); + + return GIT_SUCCESS; +} + static int object_file_name(char *name, size_t n, char *dir, const git_oid *id) { size_t len = strlen(dir); diff --git a/tests/t0000-obj-hash.c b/tests/t0000-obj-hash.c new file mode 100644 index 000000000..83131fe4c --- /dev/null +++ b/tests/t0000-obj-hash.c @@ -0,0 +1,423 @@ + +#include "test_lib.h" +#include <git/odb.h> + +static char *commit_id = "3d7f8a6af076c8c3f20071a8935cdbe8228594d1"; + +static unsigned char commit_data[] = { + 0x74, 0x72, 0x65, 0x65, 0x20, 0x64, 0x66, 0x66, + 0x32, 0x64, 0x61, 0x39, 0x30, 0x62, 0x32, 0x35, + 0x34, 0x65, 0x31, 0x62, 0x65, 0x62, 0x38, 0x38, + 0x39, 0x64, 0x31, 0x66, 0x31, 0x66, 0x31, 0x32, + 0x38, 0x38, 0x62, 0x65, 0x31, 0x38, 0x30, 0x33, + 0x37, 0x38, 0x32, 0x64, 0x66, 0x0a, 0x61, 0x75, + 0x74, 0x68, 0x6f, 0x72, 0x20, 0x41, 0x20, 0x55, + 0x20, 0x54, 0x68, 0x6f, 0x72, 0x20, 0x3c, 0x61, + 0x75, 0x74, 0x68, 0x6f, 0x72, 0x40, 0x65, 0x78, + 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, + 0x6d, 0x3e, 0x20, 0x31, 0x32, 0x32, 0x37, 0x38, + 0x31, 0x34, 0x32, 0x39, 0x37, 0x20, 0x2b, 0x30, + 0x30, 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"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"; + +static unsigned char zero_data[] = { + 0x00 /* dummy data */ +}; + +static git_obj zero_obj = { + zero_data, + 0, + GIT_OBJ_BLOB +}; + +static char *one_id = "8b137891791fe96927ad78e64b0aad7bded08bdc"; + +static unsigned char one_data[] = { + 0x0a, +}; + +static git_obj one_obj = { + one_data, + sizeof(one_data), + GIT_OBJ_BLOB +}; + +static char *two_id = "78981922613b2afb6025042ff6bd878ac1994e85"; + +static unsigned char two_data[] = { + 0x61, 0x0a, +}; + +static git_obj two_obj = { + two_data, + sizeof(two_data), + GIT_OBJ_BLOB +}; + +static char *some_id = "fd8430bc864cfcd5f10e5590f8a447e01b942bfe"; + +static unsigned char some_data[] = { + 0x2f, 0x2a, 0x0a, 0x20, 0x2a, 0x20, 0x54, 0x68, + 0x69, 0x73, 0x20, 0x66, 0x69, 0x6c, 0x65, 0x20, + 0x69, 0x73, 0x20, 0x66, 0x72, 0x65, 0x65, 0x20, + 0x73, 0x6f, 0x66, 0x74, 0x77, 0x61, 0x72, 0x65, + 0x3b, 0x20, 0x79, 0x6f, 0x75, 0x20, 0x63, 0x61, + 0x6e, 0x20, 0x72, 0x65, 0x64, 0x69, 0x73, 0x74, + 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0x0a, +}; + +static git_obj some_obj = { + some_data, + sizeof(some_data), + GIT_OBJ_BLOB +}; + +static git_obj junk_obj = { + NULL, + 0, + GIT_OBJ_BAD +}; + + +BEGIN_TEST(hash_junk) + git_oid id, id_zero; + + must_pass(git_oid_mkstr(&id_zero, zero_id)); + + /* invalid types: */ + junk_obj.data = some_data; + must_fail(git_obj_hash(&id, &junk_obj)); + + junk_obj.type = GIT_OBJ__EXT1; + must_fail(git_obj_hash(&id, &junk_obj)); + + junk_obj.type = GIT_OBJ__EXT2; + must_fail(git_obj_hash(&id, &junk_obj)); + + junk_obj.type = GIT_OBJ_OFS_DELTA; + must_fail(git_obj_hash(&id, &junk_obj)); + + junk_obj.type = GIT_OBJ_REF_DELTA; + must_fail(git_obj_hash(&id, &junk_obj)); + + /* data can be NULL only if len is zero: */ + junk_obj.type = GIT_OBJ_BLOB; + junk_obj.data = NULL; + must_pass(git_obj_hash(&id, &junk_obj)); + must_be_true(git_oid_cmp(&id, &id_zero) == 0); + + junk_obj.len = 1; + must_fail(git_obj_hash(&id, &junk_obj)); +END_TEST + +BEGIN_TEST(hash_commit) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, commit_id)); + + must_pass(git_obj_hash(&id2, &commit_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + +BEGIN_TEST(hash_tree) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, tree_id)); + + must_pass(git_obj_hash(&id2, &tree_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + +BEGIN_TEST(hash_tag) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, tag_id)); + + must_pass(git_obj_hash(&id2, &tag_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + +BEGIN_TEST(hash_zero) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, zero_id)); + + must_pass(git_obj_hash(&id2, &zero_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + +BEGIN_TEST(hash_one) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, one_id)); + + must_pass(git_obj_hash(&id2, &one_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + +BEGIN_TEST(hash_two) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, two_id)); + + must_pass(git_obj_hash(&id2, &two_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + +BEGIN_TEST(hash_some) + git_oid id1, id2; + + must_pass(git_oid_mkstr(&id1, some_id)); + + must_pass(git_obj_hash(&id2, &some_obj)); + + must_be_true(git_oid_cmp(&id1, &id2) == 0); +END_TEST + + |