thodg/libgit2

diff --git a/src/delta-apply.c b/src/delta-apply.c
index 815ca8f..85e2ef8 100644
--- a/src/delta-apply.c
+++ b/src/delta-apply.c
@@ -36,6 +36,19 @@ static int hdr_sz(
 	return 0;
 }
 
+int git__delta_read_header(
+	const unsigned char *delta,
+	size_t delta_len,
+	size_t *base_sz,
+	size_t *res_sz)
+{
+	const unsigned char *delta_end = delta + delta_len;
+	if ((hdr_sz(base_sz, &delta, delta_end) < 0) ||
+	    (hdr_sz(res_sz, &delta, delta_end) < 0))
+		return -1;
+	return 0;
+}
+
 int git__delta_apply(
 	git_rawobj *out,
 	const unsigned char *base,
diff --git a/src/delta-apply.h b/src/delta-apply.h
index 66fa76d..9aea4ac 100644
--- a/src/delta-apply.h
+++ b/src/delta-apply.h
@@ -30,4 +30,21 @@ extern int git__delta_apply(
 	const unsigned char *delta,
 	size_t delta_len);
 
+/**
+ * Read the header of a git binary delta.
+ *
+ * @param delta the delta to execute copy/insert instructions from.
+ * @param delta_len total number of bytes in the delta.
+ * @param base_sz pointer to store the base size field.
+ * @param res_sz pointer to store the result size field.
+ * @return
+ * - 0 on a successful decoding the header.
+ * - GIT_ERROR if the delta is corrupt.
+ */
+extern int git__delta_read_header(
+	const unsigned char *delta,
+	size_t delta_len,
+	size_t *base_sz,
+	size_t *res_sz);
+
 #endif