Merge branch 'master' into ds/backfill

* master: (446 commits)
  The seventh batch
  The sixth batch
  The fifth batch
  The fourth batch
  refs/reftable: fix uninitialized memory access of `max_index`
  remote: announce removal of "branches/" and "remotes/"
  The third batch
  hash.h: drop unsafe_ function variants
  csum-file: introduce hashfile_checkpoint_init()
  t/helper/test-hash.c: use unsafe_hash_algo()
  csum-file.c: use unsafe_hash_algo()
  hash.h: introduce `unsafe_hash_algo()`
  csum-file.c: extract algop from hashfile_checksum_valid()
  csum-file: store the hash algorithm as a struct field
  t/helper/test-tool: implement sha1-unsafe helper
  trace2: prevent segfault on config collection with valueless true
  refs: fix creation of reflog entries for symrefs
  ci: wire up Visual Studio build with Meson
  ci: raise error when Meson generates warnings
  meson: fix compilation with Visual Studio
  ...

1 files changed, 12 insertions, 16 deletions

diff --git a/hash.h b/hash.h
index 756166ce5e..ad2c919991 100644
--- a/hash.h
+++ b/hash.h
@@ -282,21 +282,6 @@ struct git_hash_algo {
 	/* The hash finalization function for object IDs. */
 	git_hash_final_oid_fn final_oid_fn;
 
-	/* The non-cryptographic hash initialization function. */
-	git_hash_init_fn unsafe_init_fn;
-
-	/* The non-cryptographic hash context cloning function. */
-	git_hash_clone_fn unsafe_clone_fn;
-
-	/* The non-cryptographic hash update function. */
-	git_hash_update_fn unsafe_update_fn;
-
-	/* The non-cryptographic hash finalization function. */
-	git_hash_final_fn unsafe_final_fn;
-
-	/* The non-cryptographic hash finalization function. */
-	git_hash_final_oid_fn unsafe_final_oid_fn;
-
 	/* The OID of the empty tree. */
 	const struct object_id *empty_tree;
 
@@ -305,6 +290,9 @@ struct git_hash_algo {
 
 	/* The all-zeros OID. */
 	const struct object_id *null_oid;
+
+	/* The unsafe variant of this hash function, if one exists. */
+	const struct git_hash_algo *unsafe;
 };
 extern const struct git_hash_algo hash_algos[GIT_HASH_NALGOS];
 
@@ -320,9 +308,17 @@ int hash_algo_by_length(int len);
 /* Identical, except for a pointer to struct git_hash_algo. */
 static inline int hash_algo_by_ptr(const struct git_hash_algo *p)
 {
-	return p - hash_algos;
+	size_t i;
+	for (i = 0; i < GIT_HASH_NALGOS; i++) {
+		const struct git_hash_algo *algop = &hash_algos[i];
+		if (p == algop)
+			return i;
+	}
+	return GIT_HASH_UNKNOWN;
 }
 
+const struct git_hash_algo *unsafe_hash_algo(const struct git_hash_algo *algop);
+
 const struct object_id *null_oid(void);
 
 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2, const struct git_hash_algo *algop)