thodg/libgit2

diff --git a/examples/blame.c b/examples/blame.c
index fa586b3..8484c9f 100644
--- a/examples/blame.c
+++ b/examples/blame.c
@@ -72,7 +72,7 @@ int lg2_blame(git_repository *repo, int argc, char *argv[])
 	 * Get the raw data inside the blob for output. We use the
 	 * `commitish:path/to/file.txt` format to find it.
 	 */
-	if (git_oid_iszero(&blameopts.newest_commit))
+	if (git_oid_is_zero(&blameopts.newest_commit))
 		strcpy(spec, "HEAD");
 	else
 		git_oid_tostr(spec, sizeof(spec), &blameopts.newest_commit);
@@ -101,7 +101,7 @@ int lg2_blame(git_repository *repo, int argc, char *argv[])
 		if (hunk) {
 			char sig[128] = {0};
 			break_on_null_hunk = 1;
-			
+
 			git_oid_tostr(oid, 10, &hunk->final_commit_id);
 			snprintf(sig, 30, "%s <%s>", hunk->final_signature->name, hunk->final_signature->email);
 
diff --git a/examples/fetch.c b/examples/fetch.c
index 7f8e231..3b1fad1 100644
--- a/examples/fetch.c
+++ b/examples/fetch.c
@@ -21,7 +21,7 @@ static int update_cb(const char *refname, const git_oid *a, const git_oid *b, vo
 	git_oid_fmt(b_str, b);
 	b_str[GIT_OID_HEXSZ] = '\0';
 
-	if (git_oid_iszero(a)) {
+	if (git_oid_is_zero(a)) {
 		printf("[new]     %.20s %s\n", b_str, refname);
 	} else {
 		git_oid_fmt(a_str, a);
diff --git a/include/git2/deprecated.h b/include/git2/deprecated.h
index 09388cb..108d422 100644
--- a/include/git2/deprecated.h
+++ b/include/git2/deprecated.h
@@ -271,7 +271,6 @@ GIT_EXTERN(void) giterr_set_oom(void);
  * There is no plan to remove these backward compatibility values at
  * this time.
  */
-/**@{*/
 
 typedef git_cred_sign_cb git_cred_sign_callback;
 typedef git_cred_ssh_interactive_cb git_cred_ssh_interactive_callback;
@@ -292,6 +291,20 @@ typedef git_trace_cb git_trace_callback;
 
 /**@}*/
 
+/** @name Deprecated Object ID Types
+ *
+ * These types are retained for backward compatibility.  The newer
+ * versions of these values should be preferred in all new code.
+ *
+ * There is no plan to remove these backward compatibility values at
+ * this time.
+ */
+/**@{*/
+
+GIT_EXTERN(int) git_oid_iszero(const git_oid *id);
+
+/**@}*/
+
 /** @name Deprecated Transfer Progress Types
  *
  * These types are retained for backward compatibility.  The newer
diff --git a/include/git2/oid.h b/include/git2/oid.h
index 7e071ba..8f27c13 100644
--- a/include/git2/oid.h
+++ b/include/git2/oid.h
@@ -207,7 +207,7 @@ GIT_EXTERN(int) git_oid_strcmp(const git_oid *id, const char *str);
  *
  * @return 1 if all zeros, 0 otherwise.
  */
-GIT_EXTERN(int) git_oid_iszero(const git_oid *id);
+GIT_EXTERN(int) git_oid_is_zero(const git_oid *id);
 
 /**
  * OID Shortener object
diff --git a/src/blame.c b/src/blame.c
index 6381fae..56b5b07 100644
--- a/src/blame.c
+++ b/src/blame.c
@@ -204,7 +204,7 @@ static int normalize_options(
 	memcpy(out, in, sizeof(git_blame_options));
 
 	/* No newest_commit => HEAD */
-	if (git_oid_iszero(&out->newest_commit)) {
+	if (git_oid_is_zero(&out->newest_commit)) {
 		if (git_reference_name_to_id(&out->newest_commit, repo, "HEAD") < 0) {
 			return -1;
 		}
@@ -408,7 +408,7 @@ on_error:
 
 static bool hunk_is_bufferblame(git_blame_hunk *hunk)
 {
-	return git_oid_iszero(&hunk->final_commit_id);
+	return git_oid_is_zero(&hunk->final_commit_id);
 }
 
 static int buffer_hunk_cb(
diff --git a/src/diff_file.c b/src/diff_file.c
index ae1016d..d507c75 100644
--- a/src/diff_file.c
+++ b/src/diff_file.c
@@ -232,7 +232,7 @@ static int diff_file_content_load_blob(
 	int error = 0;
 	git_odb_object *odb_obj = NULL;
 
-	if (git_oid_iszero(&fc->file->id))
+	if (git_oid_is_zero(&fc->file->id))
 		return 0;
 
 	if (fc->file->mode == GIT_FILEMODE_COMMIT)
diff --git a/src/diff_generate.c b/src/diff_generate.c
index 5579dc2..001cefd 100644
--- a/src/diff_generate.c
+++ b/src/diff_generate.c
@@ -179,7 +179,7 @@ static int diff_delta__from_one(
 
 	delta->old_file.flags |= GIT_DIFF_FLAG_VALID_ID;
 
-	if (has_old || !git_oid_iszero(&delta->new_file.id))
+	if (has_old || !git_oid_is_zero(&delta->new_file.id))
 		delta->new_file.flags |= GIT_DIFF_FLAG_VALID_ID;
 
 	return diff_insert_delta(diff, delta, matched_pathspec);
@@ -240,7 +240,7 @@ static int diff_delta__from_two(
 		delta->old_file.flags |= GIT_DIFF_FLAG_EXISTS;
 		delta->new_file.flags |= GIT_DIFF_FLAG_EXISTS;
 
-		if (!git_oid_iszero(&new_entry->id))
+		if (!git_oid_is_zero(&new_entry->id))
 			delta->new_file.flags |= GIT_DIFF_FLAG_VALID_ID;
 	}
 
@@ -797,13 +797,13 @@ static int maybe_modified(
 	/* if oids and modes match (and are valid), then file is unmodified */
 	} else if (git_oid_equal(&oitem->id, &nitem->id) &&
 			 omode == nmode &&
-			 !git_oid_iszero(&oitem->id)) {
+			 !git_oid_is_zero(&oitem->id)) {
 		status = GIT_DELTA_UNMODIFIED;
 
 	/* if we have an unknown OID and a workdir iterator, then check some
 	 * circumstances that can accelerate things or need special handling
 	 */
-	} else if (git_oid_iszero(&nitem->id) && new_is_workdir) {
+	} else if (git_oid_is_zero(&nitem->id) && new_is_workdir) {
 		bool use_ctime =
 			((diff->diffcaps & GIT_DIFFCAPS_TRUST_CTIME) != 0);
 		git_index *index = git_iterator_index(info->new_iter);
@@ -843,7 +843,7 @@ static int maybe_modified(
 	/* if we got here and decided that the files are modified, but we
 	 * haven't calculated the OID of the new item, then calculate it now
 	 */
-	if (modified_uncertain && git_oid_iszero(&nitem->id)) {
+	if (modified_uncertain && git_oid_is_zero(&nitem->id)) {
 		const git_oid *update_check =
 			DIFF_FLAG_IS_SET(diff, GIT_DIFF_UPDATE_INDEX) && omode == nmode ?
 			&oitem->id : NULL;
@@ -877,7 +877,7 @@ static int maybe_modified(
 
 	return diff_delta__from_two(
 		diff, status, oitem, omode, nitem, nmode,
-		git_oid_iszero(&noid) ? NULL : &noid, matched_pathspec);
+		git_oid_is_zero(&noid) ? NULL : &noid, matched_pathspec);
 }
 
 static bool entry_is_prefixed(
diff --git a/src/diff_print.c b/src/diff_print.c
index 8705615..e1a25a9 100644
--- a/src/diff_print.c
+++ b/src/diff_print.c
@@ -325,10 +325,10 @@ static int diff_delta_format_with_paths(
 	const char *oldpath,
 	const char *newpath)
 {
-	if (git_oid_iszero(&delta->old_file.id))
+	if (git_oid_is_zero(&delta->old_file.id))
 		oldpath = "/dev/null";
 
-	if (git_oid_iszero(&delta->new_file.id))
+	if (git_oid_is_zero(&delta->new_file.id))
 		newpath = "/dev/null";
 
 	return git_buf_printf(out, template, oldpath, newpath);
@@ -381,8 +381,8 @@ done:
 
 static bool delta_is_unchanged(const git_diff_delta *delta)
 {
-	if (git_oid_iszero(&delta->old_file.id) &&
-		git_oid_iszero(&delta->new_file.id))
+	if (git_oid_is_zero(&delta->old_file.id) &&
+		git_oid_is_zero(&delta->new_file.id))
 		return true;
 
 	if (delta->old_file.mode == GIT_FILEMODE_COMMIT ||
diff --git a/src/diff_tform.c b/src/diff_tform.c
index 00ce1cb..a87661e 100644
--- a/src/diff_tform.c
+++ b/src/diff_tform.c
@@ -560,13 +560,13 @@ static int similarity_measure(
 
 	/* if exact match is requested, force calculation of missing OIDs now */
 	if (exact_match) {
-		if (git_oid_iszero(&a_file->id) &&
+		if (git_oid_is_zero(&a_file->id) &&
 			diff->old_src == GIT_ITERATOR_TYPE_WORKDIR &&
 			!git_diff__oid_for_file(&a_file->id,
 				diff, a_file->path, a_file->mode, a_file->size))
 			a_file->flags |= GIT_DIFF_FLAG_VALID_ID;
 
-		if (git_oid_iszero(&b_file->id) &&
+		if (git_oid_is_zero(&b_file->id) &&
 			diff->new_src == GIT_ITERATOR_TYPE_WORKDIR &&
 			!git_diff__oid_for_file(&b_file->id,
 				diff, b_file->path, b_file->mode, b_file->size))
diff --git a/src/filter.c b/src/filter.c
index 33ddfe2..96c27fd 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -385,7 +385,7 @@ uint16_t git_filter_source_filemode(const git_filter_source *src)
 
 const git_oid *git_filter_source_id(const git_filter_source *src)
 {
-	return git_oid_iszero(&src->oid) ? NULL : &src->oid;
+	return git_oid_is_zero(&src->oid) ? NULL : &src->oid;
 }
 
 git_filter_mode_t git_filter_source_mode(const git_filter_source *src)
diff --git a/src/odb.c b/src/odb.c
index 1c923c5..0ede4a3 100644
--- a/src/odb.c
+++ b/src/odb.c
@@ -766,7 +766,7 @@ int git_odb_exists(git_odb *db, const git_oid *id)
 
 	assert(db && id);
 
-	if (git_oid_iszero(id))
+	if (git_oid_is_zero(id))
 		return 0;
 
 	if ((object = git_cache_get_raw(odb_cache(db), id)) != NULL) {
@@ -994,7 +994,7 @@ int git_odb__read_header_or_object(
 
 	*out = NULL;
 
-	if (git_oid_iszero(id))
+	if (git_oid_is_zero(id))
 		return error_null_oid(GIT_ENOTFOUND, "cannot read object");
 
 	if ((object = git_cache_get_raw(odb_cache(db), id)) != NULL) {
@@ -1099,7 +1099,7 @@ int git_odb_read(git_odb_object **out, git_odb *db, const git_oid *id)
 
 	assert(out && db && id);
 
-	if (git_oid_iszero(id))
+	if (git_oid_is_zero(id))
 		return error_null_oid(GIT_ENOTFOUND, "cannot read object");
 
 	*out = git_cache_get_raw(odb_cache(db), id);
@@ -1123,7 +1123,7 @@ static int odb_otype_fast(git_object_t *type_p, git_odb *db, const git_oid *id)
 	size_t _unused;
 	int error;
 
-	if (git_oid_iszero(id))
+	if (git_oid_is_zero(id))
 		return error_null_oid(GIT_ENOTFOUND, "cannot get object type");
 
 	if ((object = git_cache_get_raw(odb_cache(db), id)) != NULL) {
@@ -1283,7 +1283,7 @@ int git_odb_write(
 
 	git_odb_hash(oid, data, len, type);
 
-	if (git_oid_iszero(oid))
+	if (git_oid_is_zero(oid))
 		return error_null_oid(GIT_EINVALID, "cannot write object");
 
 	if (git_odb__freshen(db, oid))
diff --git a/src/oid.c b/src/oid.c
index 8d45e4d..605c1e6 100644
--- a/src/oid.c
+++ b/src/oid.c
@@ -237,7 +237,7 @@ int git_oid_streq(const git_oid *oid_a, const char *str)
 	return git_oid_strcmp(oid_a, str) == 0 ? 0 : -1;
 }
 
-int git_oid_iszero(const git_oid *oid_a)
+int git_oid_is_zero(const git_oid *oid_a)
 {
 	const unsigned char *a = oid_a->id;
 	unsigned int i;
@@ -247,6 +247,11 @@ int git_oid_iszero(const git_oid *oid_a)
 	return 1;
 }
 
+int git_oid_iszero(const git_oid *oid_a)
+{
+	return git_oid_is_zero(oid_a);
+}
+
 typedef short node_index;
 
 typedef union {
diff --git a/src/push.c b/src/push.c
index 9770771..67ebcfb 100644
--- a/src/push.c
+++ b/src/push.c
@@ -196,7 +196,7 @@ int git_push_update_tips(git_push *push, const git_remote_callbacks *callbacks)
 			continue;
 
 		/* Update the remote ref */
-		if (git_oid_iszero(&push_spec->loid)) {
+		if (git_oid_is_zero(&push_spec->loid)) {
 			error = git_reference_lookup(&remote_ref, push->remote->repo, git_buf_cstr(&remote_ref_name));
 
 			if (error >= 0) {
@@ -281,7 +281,7 @@ static int queue_objects(git_push *push)
 		git_object_t type;
 		size_t size;
 
-		if (git_oid_iszero(&spec->loid))
+		if (git_oid_is_zero(&spec->loid))
 			/*
 			 * Delete reference on remote side;
 			 * nothing to do here.
@@ -319,7 +319,7 @@ static int queue_objects(git_push *push)
 		if (!spec->refspec.force) {
 			git_oid base;
 
-			if (git_oid_iszero(&spec->roid))
+			if (git_oid_is_zero(&spec->roid))
 				continue;
 
 			if (!git_odb_exists(push->repo->_odb, &spec->roid)) {
@@ -346,7 +346,7 @@ static int queue_objects(git_push *push)
 	}
 
 	git_vector_foreach(&push->remote->refs, i, head) {
-		if (git_oid_iszero(&head->oid))
+		if (git_oid_is_zero(&head->oid))
 			continue;
 
 		/* TODO */
diff --git a/src/refs.c b/src/refs.c
index 4604d4c..dce9e79 100644
--- a/src/refs.c
+++ b/src/refs.c
@@ -386,7 +386,7 @@ const git_oid *git_reference_target_peel(const git_reference *ref)
 {
 	assert(ref);
 
-	if (ref->type != GIT_REFERENCE_DIRECT || git_oid_iszero(&ref->peel))
+	if (ref->type != GIT_REFERENCE_DIRECT || git_oid_is_zero(&ref->peel))
 		return NULL;
 
 	return &ref->peel;
@@ -1380,7 +1380,7 @@ int git_reference_peel(
 	 * to a commit. So we only want to use the peeled value
 	 * if it is not zero and the target is not a tag.
 	 */
-	if (target_type != GIT_OBJECT_TAG && !git_oid_iszero(&resolved->peel)) {
+	if (target_type != GIT_OBJECT_TAG && !git_oid_is_zero(&resolved->peel)) {
 		error = git_object_lookup(&target,
 			git_reference_owner(ref), &resolved->peel, GIT_OBJECT_ANY);
 	} else {
diff --git a/src/status.c b/src/status.c
index a01736d..754fe08 100644
--- a/src/status.c
+++ b/src/status.c
@@ -86,14 +86,14 @@ static unsigned int workdir_delta2status(
 			/* if OIDs don't match, we might need to calculate them now to
 			 * discern between RENAMED vs RENAMED+MODIFED
 			 */
-			if (git_oid_iszero(&idx2wd->old_file.id) &&
+			if (git_oid_is_zero(&idx2wd->old_file.id) &&
 				diff->old_src == GIT_ITERATOR_TYPE_WORKDIR &&
 				!git_diff__oid_for_file(
 					&idx2wd->old_file.id, diff, idx2wd->old_file.path,
 					idx2wd->old_file.mode, idx2wd->old_file.size))
 			idx2wd->old_file.flags |= GIT_DIFF_FLAG_VALID_ID;
 
-			if (git_oid_iszero(&idx2wd->new_file.id) &&
+			if (git_oid_is_zero(&idx2wd->new_file.id) &&
 				diff->new_src == GIT_ITERATOR_TYPE_WORKDIR &&
 				!git_diff__oid_for_file(
 					&idx2wd->new_file.id, diff, idx2wd->new_file.path,
diff --git a/src/transports/local.c b/src/transports/local.c
index c8b4291..591dd3b 100644
--- a/src/transports/local.c
+++ b/src/transports/local.c
@@ -309,7 +309,7 @@ static int local_push_update_remote_ref(
 	if (lref[0] != '\0') {
 		/* Create or update a ref */
 		error = git_reference_create(NULL, remote_repo, rref, loid,
-					     !git_oid_iszero(roid), NULL);
+					     !git_oid_is_zero(roid), NULL);
 	} else {
 		/* Delete a ref */
 		if ((error = git_reference_lookup(&remote_ref, remote_repo, rref)) < 0) {
diff --git a/src/transports/smart.c b/src/transports/smart.c
index 7f66ae0..f3d55b2 100644
--- a/src/transports/smart.c
+++ b/src/transports/smart.c
@@ -286,7 +286,7 @@ static int git_smart__connect(
 	if ((error = git_smart__detect_caps(first, &t->caps, &symrefs)) == 0) {
 		/* If the only ref in the list is capabilities^{} with OID_ZERO, remove it */
 		if (1 == t->refs.length && !strcmp(first->head.name, "capabilities^{}") &&
-			git_oid_iszero(&first->head.oid)) {
+			git_oid_is_zero(&first->head.oid)) {
 			git_vector_clear(&t->refs);
 			git_pkt_free((git_pkt *)first);
 		}
diff --git a/src/transports/smart_protocol.c b/src/transports/smart_protocol.c
index 9c93a7f..c251eb8 100644
--- a/src/transports/smart_protocol.c
+++ b/src/transports/smart_protocol.c
@@ -963,7 +963,7 @@ static int update_refs_from_report(
 
 	/* Remove any refs which we updated to have a zero OID. */
 	git_vector_rforeach(refs, i, ref) {
-		if (git_oid_iszero(&ref->head.oid)) {
+		if (git_oid_is_zero(&ref->head.oid)) {
 			git_vector_remove(refs, i);
 			git_pkt_free((git_pkt *)ref);
 		}
diff --git a/src/tree.c b/src/tree.c
index 1231754..5a48bfc 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -479,7 +479,7 @@ static int check_entry(git_repository *repo, const char *filename, const git_oid
 	if (!valid_entry_name(repo, filename))
 		return tree_error("failed to insert entry: invalid name for a tree entry", filename);
 
-	if (git_oid_iszero(id))
+	if (git_oid_is_zero(id))
 		return tree_error("failed to insert entry: invalid null OID", filename);
 
 	if (filemode != GIT_FILEMODE_COMMIT &&
diff --git a/tests/diff/blob.c b/tests/diff/blob.c
index bebe6db..50edf6b 100644
--- a/tests/diff/blob.c
+++ b/tests/diff/blob.c
@@ -315,7 +315,7 @@ void test_diff_blob__can_compare_against_null_blobs_with_patch(void)
 	cl_assert_equal_i(GIT_DELTA_DELETED, delta->status);
 	cl_assert_equal_oid(git_blob_id(d), &delta->old_file.id);
 	cl_assert_equal_sz(git_blob_rawsize(d), delta->old_file.size);
-	cl_assert(git_oid_iszero(&delta->new_file.id));
+	cl_assert(git_oid_is_zero(&delta->new_file.id));
 	cl_assert_equal_sz(0, delta->new_file.size);
 
 	cl_assert_equal_i(1, (int)git_patch_num_hunks(p));
@@ -338,7 +338,7 @@ void test_diff_blob__can_compare_against_null_blobs_with_patch(void)
 	delta = git_patch_get_delta(p);
 	cl_assert(delta != NULL);
 	cl_assert_equal_i(GIT_DELTA_ADDED, delta->status);
-	cl_assert(git_oid_iszero(&delta->old_file.id));
+	cl_assert(git_oid_is_zero(&delta->old_file.id));
 	cl_assert_equal_sz(0, delta->old_file.size);
 	cl_assert_equal_oid(git_blob_id(d), &delta->new_file.id);
 	cl_assert_equal_sz(git_blob_rawsize(d), delta->new_file.size);
@@ -445,9 +445,9 @@ void test_diff_blob__can_compare_identical_blobs_with_patch(void)
 	cl_assert(delta != NULL);
 	cl_assert_equal_i(GIT_DELTA_UNMODIFIED, delta->status);
 	cl_assert_equal_sz(0, delta->old_file.size);
-	cl_assert(git_oid_iszero(&delta->old_file.id));
+	cl_assert(git_oid_is_zero(&delta->old_file.id));
 	cl_assert_equal_sz(0, delta->new_file.size);
-	cl_assert(git_oid_iszero(&delta->new_file.id));
+	cl_assert(git_oid_is_zero(&delta->new_file.id));
 
 	cl_assert_equal_i(0, (int)git_patch_num_hunks(p));
 	git_patch_free(p);
@@ -520,19 +520,19 @@ void test_diff_blob__can_compare_a_binary_blob_and_a_text_blob(void)
  * +++ b/a0f7217
  * @@ -1,6 +1,6 @@
  *  Here is some stuff at the start
- * 
+ *
  * -This should go in one hunk
  * +This should go in one hunk (first)
- * 
+ *
  *  Some additional lines
- * 
+ *
  * @@ -8,7 +8,7 @@ Down here below the other lines
- * 
+ *
  *  With even more at the end
- * 
+ *
  * -Followed by a second hunk of stuff
  * +Followed by a second hunk of stuff (second)
- * 
+ *
  *  That happens down here
  */
 void test_diff_blob__comparing_two_text_blobs_honors_interhunkcontext(void)