thodg/libgit2

diff --git a/include/git2/mailmap.h b/include/git2/mailmap.h
index 761db67..b22a00c 100644
--- a/include/git2/mailmap.h
+++ b/include/git2/mailmap.h
@@ -58,9 +58,11 @@ GIT_EXTERN(int) git_mailmap_add_entry(
  *
  * @param mm mailmap to add the entries to
  * @param buf the buffer to read the mailmap file from
+ * @param len the length of the input buffer [optional: 0 defaults to 'strlen']
  * @return 0 on success, or an error code
  */
-GIT_EXTERN(int) git_mailmap_add_buffer(git_mailmap *mm, const git_buf *buf);
+GIT_EXTERN(int) git_mailmap_add_buffer(
+	git_mailmap *mm, const char *buf, size_t len);
 
 /**
  * Create a new mailmap instance containing a single mailmap file
@@ -72,9 +74,11 @@ GIT_EXTERN(int) git_mailmap_add_buffer(git_mailmap *mm, const git_buf *buf);
  *
  * @param out pointer to store the new mailmap
  * @param buf buffer to parse the mailmap from
+ * @param len the length of the input buffer [optional: 0 defaults to 'strlen']
  * @return 0 on success, or an error code
  */
-GIT_EXTERN(int) git_mailmap_from_buffer(git_mailmap **out, const git_buf *buf);
+GIT_EXTERN(int) git_mailmap_from_buffer(
+	git_mailmap **out, const char *buf, size_t len);
 
 /**
  * Create a new mailmap instance from a repository, loading mailmap files based
@@ -109,6 +113,19 @@ GIT_EXTERN(int) git_mailmap_resolve(
 	const char **real_name, const char **real_email,
 	const git_mailmap *mm, const char *name, const char *email);
 
+/**
+ * Resolve a signature to use real names and emails with a mailmap.
+ *
+ * Call `git_signature_free()` to free the data.
+ *
+ * @param out new signature
+ * @param mm mailmap to resolve with
+ * @param sig signature to resolve
+ * @return 0 or an error code
+ */
+GIT_EXTERN(int) git_mailmap_resolve_signature(
+	git_signature **out, const git_mailmap *mm, const git_signature *sig);
+
 /** @} */
 GIT_END_DECL
 #endif
diff --git a/include/git2/signature.h b/include/git2/signature.h
index 981a4f1..7a2a023 100644
--- a/include/git2/signature.h
+++ b/include/git2/signature.h
@@ -76,18 +76,6 @@ GIT_EXTERN(int) git_signature_default(git_signature **out, git_repository *repo)
 GIT_EXTERN(int) git_signature_from_buffer(git_signature **out, const char *buf);
 
 /**
- * Create a signature with names updated respecting the mailmap.
- *
- * Call `git_signature_free()` to free the data.
- *
- * @param out new signature
- * @param sig signature to resolve
- * @param mailmap mailmap to resolve with
- * @return 0 or an error code
- */
-GIT_EXTERN(int) git_signature_with_mailmap(git_signature **out, const git_signature *sig, const git_mailmap *mailmap);
-
-/**
  * Create a copy of an existing signature.  All internal strings are also
  * duplicated.
  *
diff --git a/include/git2/types.h b/include/git2/types.h
index 943a7e9..607a62a 100644
--- a/include/git2/types.h
+++ b/include/git2/types.h
@@ -434,7 +434,7 @@ struct git_writestream {
 	void (*free)(git_writestream *stream);
 };
 
-/** A parsed representation of a .mailmap file. */
+/** Representation of .mailmap file state. */
 typedef struct git_mailmap git_mailmap;
 
 /** @} */
diff --git a/src/commit.c b/src/commit.c
index 03ecea8..e0ba51d 100644
--- a/src/commit.c
+++ b/src/commit.c
@@ -11,6 +11,7 @@
 #include "git2/object.h"
 #include "git2/repository.h"
 #include "git2/signature.h"
+#include "git2/mailmap.h"
 #include "git2/sys/commit.h"
 
 #include "odb.h"
@@ -893,11 +894,11 @@ cleanup:
 int git_commit_committer_with_mailmap(
 	git_signature **out, const git_commit *commit, const git_mailmap *mailmap)
 {
-	return git_signature_with_mailmap(out, commit->committer, mailmap);
+	return git_mailmap_resolve_signature(out, mailmap, commit->committer);
 }
 
 int git_commit_author_with_mailmap(
 	git_signature **out, const git_commit *commit, const git_mailmap *mailmap)
 {
-	return git_signature_with_mailmap(out, commit->author, mailmap);
+	return git_mailmap_resolve_signature(out, mailmap, commit->author);
 }
diff --git a/src/mailmap.c b/src/mailmap.c
index 3da46a8..bfee489 100644
--- a/src/mailmap.c
+++ b/src/mailmap.c
@@ -10,6 +10,7 @@
 #include "common.h"
 #include "path.h"
 #include "repository.h"
+#include "signature.h"
 #include "git2/config.h"
 #include "git2/revparse.h"
 #include "blob.h"
@@ -171,9 +172,12 @@ void git_mailmap_free(git_mailmap *mm)
 	git__free(mm);
 }
 
-int git_mailmap_add_entry(
-	git_mailmap *mm, const char *real_name, const char *real_email,
-	const char *replace_name, const char *replace_email)
+static int mailmap_add_entry_unterminated(
+	git_mailmap *mm,
+	const char *real_name, size_t real_name_size,
+	const char *real_email, size_t real_email_size,
+	const char *replace_name, size_t replace_name_size,
+	const char *replace_email, size_t replace_email_size)
 {
 	int error;
 	git_mailmap_entry *entry = git__calloc(1, sizeof(git_mailmap_entry));
@@ -181,19 +185,19 @@ int git_mailmap_add_entry(
 
 	assert(mm && replace_email && *replace_email);
 
-	if (real_name && *real_name) {
-		entry->real_name = git__strdup(real_name);
+	if (real_name_size > 0) {
+		entry->real_name = git__substrdup(real_name, real_name_size);
 		GITERR_CHECK_ALLOC(entry->real_name);
 	}
-	if (real_email && *real_email) {
-		entry->real_email = git__strdup(real_email);
+	if (real_email_size > 0) {
+		entry->real_email = git__substrdup(real_email, real_email_size);
 		GITERR_CHECK_ALLOC(entry->real_email);
 	}
-	if (replace_name && *replace_name) {
-		entry->replace_name = git__strdup(replace_name);
+	if (replace_name_size > 0) {
+		entry->replace_name = git__substrdup(replace_name, replace_name_size);
 		GITERR_CHECK_ALLOC(entry->replace_name);
 	}
-	entry->replace_email = git__strdup(replace_email);
+	entry->replace_email = git__substrdup(replace_email, replace_email_size);
 	GITERR_CHECK_ALLOC(entry->replace_email);
 
 	error = git_vector_insert_sorted(&mm->entries, entry, mailmap_entry_replace);
@@ -203,10 +207,21 @@ int git_mailmap_add_entry(
 	return error;
 }
 
-int git_mailmap_add_buffer(git_mailmap *mm, const git_buf *buf)
+int git_mailmap_add_entry(
+	git_mailmap *mm, const char *real_name, const char *real_email,
+	const char *replace_name, const char *replace_email)
+{
+	return mailmap_add_entry_unterminated(
+		mm,
+		real_name, real_name ? strlen(real_name) : 0,
+		real_email, real_email ? strlen(real_email) : 0,
+		replace_name, replace_name ? strlen(replace_name) : 0,
+		replace_email, strlen(replace_email));
+}
+
+int git_mailmap_add_buffer(git_mailmap *mm, const char *buf, size_t len)
 {
 	int error;
-	git_mailmap_entry *entry = NULL;
 	git_parse_ctx ctx;
 
 	/* Scratch buffers containing the real parsed names & emails */
@@ -215,10 +230,15 @@ int git_mailmap_add_buffer(git_mailmap *mm, const git_buf *buf)
 	git_buf replace_name = GIT_BUF_INIT;
 	git_buf replace_email = GIT_BUF_INIT;
 
-	if (git_buf_contains_nul(buf))
+	/* If `len` is passed as 0, use strlen to get the real length */
+	if (buf && len == 0)
+		len = strlen(buf);
+
+	/* Buffers may not contain '\0's. */
+	if (memchr(buf, '\0', len) != NULL)
 		return -1;
 
-	git_parse_ctx_init(&ctx, buf->ptr, buf->size);
+	git_parse_ctx_init(&ctx, buf, len);
 
 	/* Run the parser */
 	while (ctx.remain_len > 0) {
@@ -230,37 +250,17 @@ int git_mailmap_add_buffer(git_mailmap *mm, const git_buf *buf)
 			continue; /* TODO: warn */
 		}
 
-		entry = git__calloc(1, sizeof(git_mailmap_entry));
-		GITERR_CHECK_ALLOC(entry);
-
-		if (real_name.size > 0) {
-			entry->real_name = git__substrdup(real_name.ptr, real_name.size);
-			GITERR_CHECK_ALLOC(entry->real_name);
-		}
-		if (real_email.size > 0) {
-			entry->real_email = git__substrdup(real_email.ptr, real_email.size);
-			GITERR_CHECK_ALLOC(entry->real_email);
-		}
-		if (replace_name.size > 0) {
-			entry->replace_name = git__substrdup(replace_name.ptr, replace_name.size);
-			GITERR_CHECK_ALLOC(entry->replace_name);
-		}
-		entry->replace_email = git__substrdup(replace_email.ptr, replace_email.size);
-		GITERR_CHECK_ALLOC(entry->replace_email);
-
-		error = git_vector_insert_sorted(
-			&mm->entries, entry, mailmap_entry_replace);
+		/* NOTE: Can't use add_entry(...) as our buffers aren't terminated */
+		error = mailmap_add_entry_unterminated(
+			mm, real_name.ptr, real_name.size, real_email.ptr, real_email.size,
+			replace_name.ptr, replace_name.size, replace_email.ptr, replace_email.size);
 		if (error < 0 && error != GIT_EEXISTS)
 			goto cleanup;
 
-		entry = NULL;
 		error = 0;
 	}
 
 cleanup:
-	mailmap_entry_free(entry);
-
-	/* We never allocate data in these buffers, but better safe than sorry */
 	git_buf_free(&real_name);
 	git_buf_free(&real_email);
 	git_buf_free(&replace_name);
@@ -268,13 +268,13 @@ cleanup:
 	return error;
 }
 
-int git_mailmap_from_buffer(git_mailmap **out, const git_buf *buffer)
+int git_mailmap_from_buffer(git_mailmap **out, const char *data, size_t len)
 {
 	int error = git_mailmap_new(out);
 	if (error < 0)
 		return error;
 
-	error = git_mailmap_add_buffer(*out, buffer);
+	error = git_mailmap_add_buffer(*out, data, len);
 	if (error < 0) {
 		git_mailmap_free(*out);
 		*out = NULL;
@@ -283,7 +283,7 @@ int git_mailmap_from_buffer(git_mailmap **out, const git_buf *buffer)
 }
 
 static int mailmap_add_blob(
-	git_mailmap *mm, git_repository *repo, const char *spec)
+	git_mailmap *mm, git_repository *repo, const char *rev)
 {
 	git_object *object = NULL;
 	git_blob *blob = NULL;
@@ -292,7 +292,7 @@ static int mailmap_add_blob(
 
 	assert(mm && repo);
 
-	error = git_revparse_single(&object, repo, spec);
+	error = git_revparse_single(&object, repo, rev);
 	if (error < 0)
 		goto cleanup;
 
@@ -304,7 +304,7 @@ static int mailmap_add_blob(
 	if (error < 0)
 		goto cleanup;
 
-	error = git_mailmap_add_buffer(mm, &content);
+	error = git_mailmap_add_buffer(mm, content.ptr, content.size);
 	if (error < 0)
 		goto cleanup;
 
@@ -331,7 +331,7 @@ static int mailmap_add_file_ondisk(
 	if (error < 0)
 		goto cleanup;
 
-	error = git_mailmap_add_buffer(mm, &content);
+	error = git_mailmap_add_buffer(mm, content.ptr, content.size);
 	if (error < 0)
 		goto cleanup;
 
@@ -345,21 +345,21 @@ cleanup:
 static void mailmap_add_from_repository(git_mailmap *mm, git_repository *repo)
 {
 	git_config *config = NULL;
-	git_buf spec_buf = GIT_BUF_INIT;
+	git_buf rev_buf = GIT_BUF_INIT;
 	git_buf path_buf = GIT_BUF_INIT;
-	const char *spec = NULL;
+	const char *rev = NULL;
 	const char *path = NULL;
 
 	assert(mm && repo);
 
 	/* If we're in a bare repo, default blob to 'HEAD:.mailmap' */
 	if (repo->is_bare)
-		spec = MM_BLOB_DEFAULT;
+		rev = MM_BLOB_DEFAULT;
 
 	/* Try to load 'mailmap.file' and 'mailmap.blob' cfgs from the repo */
 	if (git_repository_config(&config, repo) == 0) {
-		if (git_config_get_string_buf(&spec_buf, config, MM_BLOB_CONFIG) == 0)
-			spec = spec_buf.ptr;
+		if (git_config_get_string_buf(&rev_buf, config, MM_BLOB_CONFIG) == 0)
+			rev = rev_buf.ptr;
 		if (git_config_get_path(&path_buf, config, MM_FILE_CONFIG) == 0)
 			path = path_buf.ptr;
 	}
@@ -377,12 +377,12 @@ static void mailmap_add_from_repository(git_mailmap *mm, git_repository *repo)
 	 */
 	if (!repo->is_bare)
 		mailmap_add_file_ondisk(mm, MM_FILE, repo);
-	if (spec != NULL)
-		mailmap_add_blob(mm, repo, spec);
+	if (rev != NULL)
+		mailmap_add_blob(mm, repo, rev);
 	if (path != NULL)
 		mailmap_add_file_ondisk(mm, path, repo);
 
-	git_buf_free(&spec_buf);
+	git_buf_free(&rev_buf);
 	git_buf_free(&path_buf);
 	git_config_free(config);
 }
@@ -403,7 +403,10 @@ const git_mailmap_entry *git_mailmap_entry_lookup(
 	ssize_t fallback = -1;
 	size_t idx;
 	git_mailmap_entry *entry;
-	git_mailmap_entry needle = { NULL, NULL, NULL, (char *)email };
+
+	/* The lookup needle we want to use only sets the replace_email. */
+	git_mailmap_entry needle = { NULL };
+	needle.replace_email = (char *)email;
 
 	assert(email);
 
@@ -457,3 +460,26 @@ int git_mailmap_resolve(
 	}
 	return 0;
 }
+
+int git_mailmap_resolve_signature(
+	git_signature **out, const git_mailmap *mailmap, const git_signature *sig)
+{
+	const char *name = NULL;
+	const char *email = NULL;
+	int error;
+
+	if (!sig)
+		return 0;
+
+	error = git_mailmap_resolve(&name, &email, mailmap, sig->name, sig->email);
+	if (error < 0)
+		return error;
+
+	error = git_signature_new(out, name, email, sig->when.time, sig->when.offset);
+	if (error < 0)
+		return error;
+
+	/* Copy over the sign, as git_signature_new doesn't let you pass it. */
+	(*out)->when.sign = sig->when.sign;
+	return 0;
+}
diff --git a/src/signature.c b/src/signature.c
index a8177e0..cd68523 100644
--- a/src/signature.c
+++ b/src/signature.c
@@ -9,7 +9,6 @@
 
 #include "repository.h"
 #include "git2/common.h"
-#include "git2/mailmap.h"
 #include "posix.h"
 
 void git_signature_free(git_signature *sig)
@@ -99,35 +98,18 @@ int git_signature_new(git_signature **sig_out, const char *name, const char *ema
 
 int git_signature_dup(git_signature **dest, const git_signature *source)
 {
-	/* If mailmap is NULL, this method just copies the signature */
-	return git_signature_with_mailmap(dest, source, NULL);
-}
-
-int git_signature_with_mailmap(
-	git_signature **dest,
-	const git_signature *source,
-	const git_mailmap *mailmap)
-{
-	git_signature *signature = NULL;
-	const char *name = NULL;
-	const char *email = NULL;
-	int error;
+	git_signature *signature;
 
 	if (source == NULL)
 		return 0;
 
-	error = git_mailmap_resolve(
-		&name, &email, mailmap, source->name, source->email);
-	if (error < 0)
-		return error;
-
 	signature = git__calloc(1, sizeof(git_signature));
 	GITERR_CHECK_ALLOC(signature);
 
-	signature->name = git__strdup(name);
+	signature->name = git__strdup(source->name);
 	GITERR_CHECK_ALLOC(signature->name);
 
-	signature->email = git__strdup(email);
+	signature->email = git__strdup(source->email);
 	GITERR_CHECK_ALLOC(signature->email);
 
 	signature->when.time = source->when.time;
diff --git a/tests/mailmap/basic.c b/tests/mailmap/basic.c
index b8a9132..20fa8be 100644
--- a/tests/mailmap/basic.c
+++ b/tests/mailmap/basic.c
@@ -27,10 +27,7 @@ struct {
 
 void test_mailmap_basic__initialize(void)
 {
-	git_buf buf = GIT_BUF_INIT;
-	git_buf_attach_notowned(&buf, TEST_MAILMAP, strlen(TEST_MAILMAP));
-
-	cl_git_pass(git_mailmap_from_buffer(&mailmap, &buf));
+	cl_git_pass(git_mailmap_from_buffer(&mailmap, TEST_MAILMAP, 0));
 }
 
 void test_mailmap_basic__cleanup(void)
diff --git a/tests/mailmap/blame.c b/tests/mailmap/blame.c
index 328f4bc..e6bc1a4 100644
--- a/tests/mailmap/blame.c
+++ b/tests/mailmap/blame.c
@@ -2,7 +2,7 @@
 #include "git2/repository.h"
 #include "git2/blame.h"
 #include "mailmap.h"
-#include "mailmap_helpers.h"
+#include "mailmap_testdata.h"
 
 static git_repository *g_repo;
 static git_blame *g_blame;
@@ -30,8 +30,7 @@ void test_mailmap_blame__hunks(void)
 	opts.flags |= GIT_BLAME_USE_MAILMAP;
 
 	cl_git_pass(git_blame_file(&g_blame, g_repo, "file.txt", &opts));
-	if (!g_blame)
-		return;
+	cl_assert(g_blame);
 
 	for (idx = 0; idx < ARRAY_SIZE(resolved); ++idx) {
 		hunk = git_blame_get_hunk_byline(g_blame, idx + 1);
@@ -52,8 +51,7 @@ void test_mailmap_blame__hunks_no_mailmap(void)
 	g_repo = cl_git_sandbox_init("mailmap");
 
 	cl_git_pass(git_blame_file(&g_blame, g_repo, "file.txt", &opts));
-	if (!g_blame)
-		return;
+	cl_assert(g_blame);
 
 	for (idx = 0; idx < ARRAY_SIZE(resolved); ++idx) {
 		hunk = git_blame_get_hunk_byline(g_blame, idx + 1);
diff --git a/tests/mailmap/mailmap_helpers.h b/tests/mailmap/mailmap_helpers.h
deleted file mode 100644
index 173536d..0000000
--- a/tests/mailmap/mailmap_helpers.h
+++ /dev/null
@@ -1,44 +0,0 @@
-#include "mailmap.h"
-
-typedef struct mailmap_entry {
-	const char *real_name;
-	const char *real_email;
-	const char *replace_name;
-	const char *replace_email;
-} mailmap_entry;
-
-static const char string_mailmap[] =
-	"# Simple Comment line\n"
-	"<cto@company.xx>                       <cto@coompany.xx>\n"
-	"Some Dude <some@dude.xx>         nick1 <bugs@company.xx>\n"
-	"Other Author <other@author.xx>   nick2 <bugs@company.xx>\n"
-	"Other Author <other@author.xx>         <nick2@company.xx>\n"
-	"Phil Hill <phil@company.xx>  # Comment at end of line\n"
-	"<joseph@company.xx>             Joseph <bugs@company.xx>\n"
-	"Santa Claus <santa.claus@northpole.xx> <me@company.xx>\n"
-	"Untracked <untracked@company.xx>";
-
-static const mailmap_entry entries[] = {
-	{ NULL, "cto@company.xx", NULL, "cto@coompany.xx" },
-	{ "Some Dude", "some@dude.xx", "nick1", "bugs@company.xx" },
-	{ "Other Author", "other@author.xx", "nick2", "bugs@company.xx" },
-	{ "Other Author", "other@author.xx", NULL, "nick2@company.xx" },
-	{ "Phil Hill", NULL, NULL, "phil@company.xx" },
-	{ NULL, "joseph@company.xx", "Joseph", "bugs@company.xx" },
-	{ "Santa Claus", "santa.claus@northpole.xx", NULL, "me@company.xx" },
-	/* This entry isn't in the bare repository */
-	{ "Untracked", NULL, NULL, "untracked@company.xx" }
-};
-
-static const mailmap_entry resolved[] = {
-	{ "Brad", "cto@company.xx", "Brad", "cto@coompany.xx" },
-	{ "Brad L", "cto@company.xx", "Brad L", "cto@coompany.xx" },
-	{ "Some Dude", "some@dude.xx", "nick1", "bugs@company.xx" },
-	{ "Other Author", "other@author.xx", "nick2", "bugs@company.xx" },
-	{ "nick3", "bugs@company.xx", "nick3", "bugs@company.xx" },
-	{ "Other Author", "other@author.xx", "Some Garbage", "nick2@company.xx" },
-	{ "Phil Hill", "phil@company.xx", "unknown", "phil@company.xx" },
-	{ "Joseph", "joseph@company.xx", "Joseph", "bugs@company.xx" },
-	{ "Santa Claus", "santa.claus@northpole.xx", "Clause", "me@company.xx" },
-	{ "Charles", "charles@charles.xx", "Charles", "charles@charles.xx" }
-};
diff --git a/tests/mailmap/mailmap_testdata.h b/tests/mailmap/mailmap_testdata.h
new file mode 100644
index 0000000..173536d
--- /dev/null
+++ b/tests/mailmap/mailmap_testdata.h
@@ -0,0 +1,44 @@
+#include "mailmap.h"
+
+typedef struct mailmap_entry {
+	const char *real_name;
+	const char *real_email;
+	const char *replace_name;
+	const char *replace_email;
+} mailmap_entry;
+
+static const char string_mailmap[] =
+	"# Simple Comment line\n"
+	"<cto@company.xx>                       <cto@coompany.xx>\n"
+	"Some Dude <some@dude.xx>         nick1 <bugs@company.xx>\n"
+	"Other Author <other@author.xx>   nick2 <bugs@company.xx>\n"
+	"Other Author <other@author.xx>         <nick2@company.xx>\n"
+	"Phil Hill <phil@company.xx>  # Comment at end of line\n"
+	"<joseph@company.xx>             Joseph <bugs@company.xx>\n"
+	"Santa Claus <santa.claus@northpole.xx> <me@company.xx>\n"
+	"Untracked <untracked@company.xx>";
+
+static const mailmap_entry entries[] = {
+	{ NULL, "cto@company.xx", NULL, "cto@coompany.xx" },
+	{ "Some Dude", "some@dude.xx", "nick1", "bugs@company.xx" },
+	{ "Other Author", "other@author.xx", "nick2", "bugs@company.xx" },
+	{ "Other Author", "other@author.xx", NULL, "nick2@company.xx" },
+	{ "Phil Hill", NULL, NULL, "phil@company.xx" },
+	{ NULL, "joseph@company.xx", "Joseph", "bugs@company.xx" },
+	{ "Santa Claus", "santa.claus@northpole.xx", NULL, "me@company.xx" },
+	/* This entry isn't in the bare repository */
+	{ "Untracked", NULL, NULL, "untracked@company.xx" }
+};
+
+static const mailmap_entry resolved[] = {
+	{ "Brad", "cto@company.xx", "Brad", "cto@coompany.xx" },
+	{ "Brad L", "cto@company.xx", "Brad L", "cto@coompany.xx" },
+	{ "Some Dude", "some@dude.xx", "nick1", "bugs@company.xx" },
+	{ "Other Author", "other@author.xx", "nick2", "bugs@company.xx" },
+	{ "nick3", "bugs@company.xx", "nick3", "bugs@company.xx" },
+	{ "Other Author", "other@author.xx", "Some Garbage", "nick2@company.xx" },
+	{ "Phil Hill", "phil@company.xx", "unknown", "phil@company.xx" },
+	{ "Joseph", "joseph@company.xx", "Joseph", "bugs@company.xx" },
+	{ "Santa Claus", "santa.claus@northpole.xx", "Clause", "me@company.xx" },
+	{ "Charles", "charles@charles.xx", "Charles", "charles@charles.xx" }
+};
diff --git a/tests/mailmap/parsing.c b/tests/mailmap/parsing.c
index 70110c0..2cb8304 100644
--- a/tests/mailmap/parsing.c
+++ b/tests/mailmap/parsing.c
@@ -1,7 +1,7 @@
 #include "clar_libgit2.h"
 #include "repository.h"
 #include "git2/sys/repository.h"
-#include "mailmap_helpers.h"
+#include "mailmap_testdata.h"
 #include "buf_text.h"
 
 static git_repository *g_repo;
@@ -67,9 +67,7 @@ static const mailmap_entry resolved_untracked[] = {
 
 void test_mailmap_parsing__string(void)
 {
-	git_buf buf = GIT_BUF_INIT;
-	git_buf_attach_notowned(&buf, string_mailmap, strlen(string_mailmap));
-	cl_git_pass(git_mailmap_from_buffer(&g_mailmap, &buf));
+	cl_git_pass(git_mailmap_from_buffer(&g_mailmap, string_mailmap, 0));
 
 	/* We should have parsed all of the entries */
 	check_mailmap_entries(g_mailmap, entries, ARRAY_SIZE(entries));
@@ -89,7 +87,7 @@ void test_mailmap_parsing__windows_string(void)
 	git_buf_attach_notowned(&unixbuf, string_mailmap, strlen(string_mailmap));
 	git_buf_text_lf_to_crlf(&winbuf, &unixbuf);
 
-	cl_git_pass(git_mailmap_from_buffer(&g_mailmap, &winbuf));
+	cl_git_pass(git_mailmap_from_buffer(&g_mailmap, winbuf.ptr, winbuf.size));
 	git_buf_free(&winbuf);
 
 	/* We should have parsed all of the entries */