[PATCH v6 12/15] reftable: implement record equality generically
- From
Han-Wen Nienhuys via GitGitGadget <gitgitgadget@gmail.com>
- Date
- Jan 20, 2022, 15:12 UTC
- Message-ID
- <6385e449ba714e3ce41f10276fc60e9757519492.1642691534.git.gitgitgadget@gmail.com>
- In-Reply-To
- <pull.1152.v6.git.git.1642691534.gitgitgadget@gmail.com>
From: Han-Wen Nienhuys <hanwen@google.com>
This simplifies unittests a little, and provides further coverage for reftable_record_copy().
Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> --- reftable/record.c | 57 +++++++++++++++++++++++++++++++++++++++++- reftable/record.h | 5 +++- reftable/record_test.c | 23 +++-------------- 3 files changed, 63 insertions(+), 22 deletions(-)
diff --git a/reftable/record.c b/reftable/record.c index f7c77c51539..2a9e41a992e 100644 --- a/reftable/record.c +++ b/reftable/record.c @@ -430,6 +430,15 @@ static int reftable_ref_record_is_deletion_void(const void *p) (const struct reftable_ref_record *)p); } + +static int reftable_ref_record_equal_void(const void *a, + const void *b, int hash_size) +{ + struct reftable_ref_record *ra = (struct reftable_ref_record *) a; + struct reftable_ref_record *rb = (struct reftable_ref_record *) b; + return reftable_ref_record_equal(ra, rb, hash_size); +} + static struct reftable_record_vtable reftable_ref_record_vtable = { .key = &reftable_ref_record_key, .type = BLOCK_TYPE_REF, @@ -439,6 +448,7 @@ static struct reftable_record_vtable reftable_ref_record_vtable = { .decode = &reftable_ref_record_decode, .release = &reftable_ref_record_release_void, .is_deletion = &reftable_ref_record_is_deletion_void, + .equal = &reftable_ref_record_equal_void, }; static void reftable_obj_record_key(const void *r, struct strbuf *dest) @@ -572,6 +582,25 @@ static int not_a_deletion(const void *p) return 0; } +static int reftable_obj_record_equal_void(const void *a, const void *b, int hash_size) +{ + struct reftable_obj_record *ra = (struct reftable_obj_record *) a; + struct reftable_obj_record *rb = (struct reftable_obj_record *) b; + + if (ra->hash_prefix_len != rb->hash_prefix_len + || ra->offset_len != rb->offset_len) + return 0; + + if (ra->hash_prefix_len && + memcmp(ra->hash_prefix, rb->hash_prefix, ra->hash_prefix_len)) + return 0; + if (ra->offset_len && + memcmp(ra->offsets, rb->offsets, ra->offset_len * sizeof(uint64_t))) + return 0; + + return 1; +} + static struct reftable_record_vtable reftable_obj_record_vtable = { .key = &reftable_obj_record_key, .type = BLOCK_TYPE_OBJ, @@ -580,7 +609,8 @@ static struct reftable_record_vtable reftable_obj_record_vtable = { .encode = &reftable_obj_record_encode, .decode = &reftable_obj_record_decode, .release = &reftable_obj_record_release, - .is_deletion = not_a_deletion, + .is_deletion = ¬_a_deletion, + .equal = &reftable_obj_record_equal_void, }; void reftable_log_record_print(struct reftable_log_record *log, @@ -881,6 +911,14 @@ static int zero_hash_eq(uint8_t *a, uint8_t *b, int sz) return !memcmp(a, b, sz); } +static int reftable_log_record_equal_void(const void *a, + const void *b, int hash_size) +{ + return reftable_log_record_equal((struct reftable_log_record *) a, + (struct reftable_log_record *) b, + hash_size); +} + int reftable_log_record_equal(const struct reftable_log_record *a, const struct reftable_log_record *b, int hash_size) { @@ -924,6 +962,7 @@ static struct reftable_record_vtable reftable_log_record_vtable = { .decode = &reftable_log_record_decode, .release = &reftable_log_record_release_void, .is_deletion = &reftable_log_record_is_deletion_void, + .equal = &reftable_log_record_equal_void }; struct reftable_record reftable_new_record(uint8_t typ) @@ -1042,6 +1081,14 @@ static int reftable_index_record_decode(void *rec, struct strbuf key, return start.len - in.len; } +static int reftable_index_record_equal(const void *a, const void *b, int hash_size) +{ + struct reftable_index_record *ia = (struct reftable_index_record *) a; + struct reftable_index_record *ib = (struct reftable_index_record *) b; + + return ia->offset == ib->offset && !strbuf_cmp(&ia->last_key, &ib->last_key); +} + static struct reftable_record_vtable reftable_index_record_vtable = { .key = &reftable_index_record_key, .type = BLOCK_TYPE_INDEX, @@ -1051,6 +1098,7 @@ static struct reftable_record_vtable reftable_index_record_vtable = { .decode = &reftable_index_record_decode, .release = &reftable_index_record_release, .is_deletion = ¬_a_deletion, + .equal = &reftable_index_record_equal, }; void reftable_record_key(struct reftable_record *rec, struct strbuf *dest) @@ -1098,6 +1146,13 @@ int reftable_record_is_deletion(struct reftable_record *rec) return rec->ops->is_deletion(rec->data); } +int reftable_record_equal(struct reftable_record *a, struct reftable_record *b, int hash_size) +{ + if (a->ops != b->ops) + return 0; + return a->ops->equal(a->data, b->data, hash_size); +} + void reftable_record_from_ref(struct reftable_record *rec, struct reftable_ref_record *ref_rec) { diff --git a/reftable/record.h b/reftable/record.h index 498e8c50bf4..da75d7d1f11 100644 --- a/reftable/record.h +++ b/reftable/record.h @@ -58,6 +58,9 @@ struct reftable_record_vtable { /* is this a tombstone? */ int (*is_deletion)(const void *rec); + + /* Are two records equal? This assumes they have the same type. Returns 0 for non-equal. */ + int (*equal)(const void *a, const void *b, int hash_size); }; /* record is a generic wrapper for different types of records. */ @@ -98,7 +101,7 @@ struct reftable_obj_record { }; /* see struct record_vtable */ - +int reftable_record_equal(struct reftable_record *a, struct reftable_record *b, int hash_size); void reftable_record_key(struct reftable_record *rec, struct strbuf *dest); uint8_t reftable_record_type(struct reftable_record *rec); void reftable_record_copy_from(struct reftable_record *rec, diff --git a/reftable/record_test.c b/reftable/record_test.c index f4ad7cace41..92680848156 100644 --- a/reftable/record_test.c +++ b/reftable/record_test.c @@ -21,18 +21,7 @@ static void test_copy(struct reftable_record *rec) reftable_record_copy_from(©, rec, GIT_SHA1_RAWSZ); /* do it twice to catch memory leaks */ reftable_record_copy_from(©, rec, GIT_SHA1_RAWSZ); - switch (reftable_record_type(©)) { - case BLOCK_TYPE_REF: - EXPECT(reftable_ref_record_equal(reftable_record_as_ref(©), - reftable_record_as_ref(rec), - GIT_SHA1_RAWSZ)); - break; - case BLOCK_TYPE_LOG: - EXPECT(reftable_log_record_equal(reftable_record_as_log(©), - reftable_record_as_log(rec), - GIT_SHA1_RAWSZ)); - break; - } + EXPECT(reftable_record_equal(rec, ©, GIT_SHA1_RAWSZ)); reftable_record_destroy(©); } @@ -346,13 +335,7 @@ static void test_reftable_obj_record_roundtrip(void) GIT_SHA1_RAWSZ); EXPECT(n == m); - EXPECT(in.hash_prefix_len == out.hash_prefix_len); - EXPECT(in.offset_len == out.offset_len); - - EXPECT(!memcmp(in.hash_prefix, out.hash_prefix, - in.hash_prefix_len)); - EXPECT(0 == memcmp(in.offsets, out.offsets, - sizeof(uint64_t) * in.offset_len)); + EXPECT(reftable_record_equal(&rec, &rec_out, GIT_SHA1_RAWSZ)); strbuf_release(&key); reftable_record_release(&rec_out); } @@ -390,7 +373,7 @@ static void test_reftable_index_record_roundtrip(void) m = reftable_record_decode(&out_rec, key, extra, dest, GIT_SHA1_RAWSZ); EXPECT(m == n); - EXPECT(in.offset == out.offset); + EXPECT(reftable_record_equal(&rec, &out_rec, GIT_SHA1_RAWSZ)); reftable_record_release(&out_rec); strbuf_release(&key);
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