1 files changed, 75 insertions, 0 deletions
diff --git a/commit-graph.h b/commit-graph.h
new file mode 100644
index 0000000000..9db40b4d3a
--- /dev/null
+++ b/commit-graph.h
@@ -0,0 +1,75 @@
+#ifndef COMMIT_GRAPH_H
+#define COMMIT_GRAPH_H
+
+#include "git-compat-util.h"
+#include "repository.h"
+#include "string-list.h"
+#include "cache.h"
+
+#define GIT_TEST_COMMIT_GRAPH "GIT_TEST_COMMIT_GRAPH"
+
+struct commit;
+
+char *get_commit_graph_filename(const char *obj_dir);
+
+/*
+ * Given a commit struct, try to fill the commit struct info, including:
+ *  1. tree object
+ *  2. date
+ *  3. parents.
+ *
+ * Returns 1 if and only if the commit was found in the packed graph.
+ *
+ * See parse_commit_buffer() for the fallback after this call.
+ */
+int parse_commit_in_graph(struct repository *r, struct commit *item);
+
+/*
+ * It is possible that we loaded commit contents from the commit buffer,
+ * but we also want to ensure the commit-graph content is correctly
+ * checked and filled. Fill the graph_pos and generation members of
+ * the given commit.
+ */
+void load_commit_graph_info(struct repository *r, struct commit *item);
+
+struct tree *get_commit_tree_in_graph(struct repository *r,
+				      const struct commit *c);
+
+struct commit_graph {
+	int graph_fd;
+
+	const unsigned char *data;
+	size_t data_len;
+
+	unsigned char hash_len;
+	unsigned char num_chunks;
+	uint32_t num_commits;
+	struct object_id oid;
+
+	const uint32_t *chunk_oid_fanout;
+	const unsigned char *chunk_oid_lookup;
+	const unsigned char *chunk_commit_data;
+	const unsigned char *chunk_large_edges;
+};
+
+struct commit_graph *load_commit_graph_one(const char *graph_file);
+
+/*
+ * Return 1 if and only if the repository has a commit-graph
+ * file and generation numbers are computed in that file.
+ */
+int generation_numbers_enabled(struct repository *r);
+
+void write_commit_graph_reachable(const char *obj_dir, int append,
+				  int report_progress);
+void write_commit_graph(const char *obj_dir,
+			struct string_list *pack_indexes,
+			struct string_list *commit_hex,
+			int append, int report_progress);
+
+int verify_commit_graph(struct repository *r, struct commit_graph *g);
+
+void close_commit_graph(struct repository *);
+void free_commit_graph(struct commit_graph *);
+
+#endif