From c960d6a3f97ebd360dc3c9ea00fdb3cd5dc56224 Mon Sep 17 00:00:00 2001 From: Ramsay Jones Date: Sat, 27 Dec 2008 18:59:43 +0000 Subject: [PATCH] Add a routine to determine a git_oid given an git_obj Signed-off-by: Ramsay Jones Signed-off-by: Shawn O. Pearce --- src/git/odb.h | 14 ++ src/odb.c | 42 ++++ tests/t0000-obj-hash.c | 423 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 479 insertions(+) create mode 100644 tests/t0000-obj-hash.c 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 diff --git a/src/odb.c b/src/odb.c index a732c71d3..32a550a02 100644 --- a/src/odb.c +++ b/src/odb.c @@ -27,6 +27,8 @@ #include "git/zlib.h" #include "common.h" #include "fileops.h" +#include "hash.h" +#include 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 + +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, 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"dff2da90b254e1beb889d1f1f1288be1803782df"; + +static unsigned char tree_data[] = { + 0x31, 0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x6f, + 0x6e, 0x65, 0x00, 0x8b, 0x13, 0x78, 0x91, 0x79, + 0x1f, 0xe9, 0x69, 0x27, 0xad, 0x78, 0xe6, 0x4b, + 0x0a, 0xad, 0x7b, 0xde, 0xd0, 0x8b, 0xdc, 0x31, + 0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x73, 0x6f, + 0x6d, 0x65, 0x00, 0xfd, 0x84, 0x30, 0xbc, 0x86, + 0x4c, 0xfc, 0xd5, 0xf1, 0x0e, 0x55, 0x90, 0xf8, + 0xa4, 0x47, 0xe0, 0x1b, 0x94, 0x2b, 0xfe, 0x31, + 0x30, 0x30, 0x36, 0x34, 0x34, 0x20, 0x74, 0x77, + 0x6f, 0x00, 0x78, 0x98, 0x19, 0x22, 0x61, 0x3b, + 0x2a, 0xfb, 0x60, 0x25, 0x04, 0x2f, 0xf6, 0xbd, + 0x87, 0x8a, 0xc1, 0x99, 0x4e, 0x85, 0x31, 0x30, + 0x30, 0x36, 0x34, 0x34, 0x20, 0x7a, 0x65, 0x72, + 0x6f, 0x00, 0xe6, 0x9d, 0xe2, 0x9b, 0xb2, 0xd1, + 0xd6, 0x43, 0x4b, 0x8b, 0x29, 0xae, 0x77, 0x5a, + 0xd8, 0xc2, 0xe4, 0x8c, 0x53, 0x91, +}; + +static git_obj tree_obj = { + tree_data, + sizeof(tree_data), + GIT_OBJ_TREE +}; + +static char *tag_id = "09d373e1dfdc16b129ceec6dd649739911541e05"; + +static unsigned char tag_data[] = { + 0x6f, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x20, 0x33, + 0x64, 0x37, 0x66, 0x38, 0x61, 0x36, 0x61, 0x66, + 0x30, 0x37, 0x36, 0x63, 0x38, 0x63, 0x33, 0x66, + 0x32, 0x30, 0x30, 0x37, 0x31, 0x61, 0x38, 0x39, + 0x33, 0x35, 0x63, 0x64, 0x62, 0x65, 0x38, 0x32, + 0x32, 0x38, 0x35, 0x39, 0x34, 0x64, 0x31, 0x0a, + 0x74, 0x79, 0x70, 0x65, 0x20, 0x63, 0x6f, 0x6d, + 0x6d, 0x69, 0x74, 0x0a, 0x74, 0x61, 0x67, 0x20, + 0x76, 0x30, 0x2e, 0x30, 0x2e, 0x31, 0x0a, 0x74, + 0x61, 0x67, 0x67, 0x65, 0x72, 0x20, 0x43, 0x20, + 0x4f, 0x20, 0x4d, 0x69, 0x74, 0x74, 0x65, 0x72, + 0x20, 0x3c, 0x63, 0x6f, 0x6d, 0x6d, 0x69, 0x74, + 0x74, 0x65, 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, 0x30, + 0x30, 0x0a, 0x0a, 0x54, 0x68, 0x69, 0x73, 0x20, + 0x69, 0x73, 0x20, 0x74, 0x68, 0x65, 0x20, 0x74, + 0x61, 0x67, 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*/ + 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 + +