1 files changed, 64 insertions, 0 deletions
diff --git a/reftable/reader.h b/reftable/reader.h
new file mode 100644
index 0000000000..e869165f23
--- /dev/null
+++ b/reftable/reader.h
@@ -0,0 +1,64 @@
+/*
+Copyright 2020 Google LLC
+
+Use of this source code is governed by a BSD-style
+license that can be found in the LICENSE file or at
+https://developers.google.com/open-source/licenses/bsd
+*/
+
+#ifndef READER_H
+#define READER_H
+
+#include "block.h"
+#include "record.h"
+#include "reftable-iterator.h"
+#include "reftable-reader.h"
+
+uint64_t block_source_size(struct reftable_block_source *source);
+
+int block_source_read_block(struct reftable_block_source *source,
+			    struct reftable_block *dest, uint64_t off,
+			    uint32_t size);
+void block_source_close(struct reftable_block_source *source);
+
+/* metadata for a block type */
+struct reftable_reader_offsets {
+	int is_present;
+	uint64_t offset;
+	uint64_t index_offset;
+};
+
+/* The state for reading a reftable file. */
+struct reftable_reader {
+	/* for convience, associate a name with the instance. */
+	char *name;
+	struct reftable_block_source source;
+
+	/* Size of the file, excluding the footer. */
+	uint64_t size;
+
+	/* 'sha1' for SHA1, 's256' for SHA-256 */
+	uint32_t hash_id;
+
+	uint32_t block_size;
+	uint64_t min_update_index;
+	uint64_t max_update_index;
+	/* Length of the OID keys in the 'o' section */
+	int object_id_len;
+	int version;
+
+	struct reftable_reader_offsets ref_offsets;
+	struct reftable_reader_offsets obj_offsets;
+	struct reftable_reader_offsets log_offsets;
+};
+
+int init_reader(struct reftable_reader *r, struct reftable_block_source *source,
+		const char *name);
+void reader_close(struct reftable_reader *r);
+const char *reader_name(struct reftable_reader *r);
+
+/* initialize a block reader to read from `r` */
+int reader_init_block_reader(struct reftable_reader *r, struct block_reader *br,
+			     uint64_t next_off, uint8_t want_typ);
+
+#endif