1 files changed, 99 insertions, 0 deletions
diff --git a/src/libgit2/oid.h b/src/libgit2/oid.h
new file mode 100644
index 000000000..abae9a4b2
--- /dev/null
+++ b/src/libgit2/oid.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#ifndef INCLUDE_oid_h__
+#define INCLUDE_oid_h__
+
+#include "common.h"
+
+#include "git2/oid.h"
+
+extern const git_oid git_oid__empty_blob_sha1;
+extern const git_oid git_oid__empty_tree_sha1;
+
+/**
+ * Format a git_oid into a newly allocated c-string.
+ *
+ * The c-string is owned by the caller and needs to be manually freed.
+ *
+ * @param id the oid structure to format
+ * @return the c-string; NULL if memory is exhausted. Caller must
+ *			deallocate the string with git__free().
+ */
+char *git_oid_allocfmt(const git_oid *id);
+
+GIT_INLINE(int) git_oid_raw_ncmp(
+	const unsigned char *sha1,
+	const unsigned char *sha2,
+	size_t len)
+{
+	if (len > GIT_OID_HEXSZ)
+		len = GIT_OID_HEXSZ;
+
+	while (len > 1) {
+		if (*sha1 != *sha2)
+			return 1;
+		sha1++;
+		sha2++;
+		len -= 2;
+	};
+
+	if (len)
+		if ((*sha1 ^ *sha2) & 0xf0)
+			return 1;
+
+	return 0;
+}
+
+GIT_INLINE(int) git_oid_raw_cmp(
+	const unsigned char *sha1,
+	const unsigned char *sha2)
+{
+	return memcmp(sha1, sha2, GIT_OID_RAWSZ);
+}
+
+GIT_INLINE(int) git_oid_raw_cpy(
+	unsigned char *dst,
+	const unsigned char *src)
+{
+	memcpy(dst, src, GIT_OID_RAWSZ);
+	return 0;
+}
+
+/*
+ * Compare two oid structures.
+ *
+ * @param a first oid structure.
+ * @param b second oid structure.
+ * @return <0, 0, >0 if a < b, a == b, a > b.
+ */
+GIT_INLINE(int) git_oid__cmp(const git_oid *a, const git_oid *b)
+{
+	return git_oid_raw_cmp(a->id, b->id);
+}
+
+GIT_INLINE(void) git_oid__cpy_prefix(
+	git_oid *out, const git_oid *id, size_t len)
+{
+	memcpy(&out->id, id->id, (len + 1) / 2);
+
+	if (len & 1)
+		out->id[len / 2] &= 0xF0;
+}
+
+GIT_INLINE(bool) git_oid__is_hexstr(const char *str)
+{
+	size_t i;
+
+	for (i = 0; str[i] != '\0'; i++) {
+		if (git__fromhex(str[i]) < 0)
+			return false;
+	}
+
+	return (i == GIT_OID_HEXSZ);
+}
+
+#endif