Merge branch 'hn/reftable'

The "reftable" backend for the refs API, without integrating into
the refs subsystem, has been added.

* hn/reftable:
  Add "test-tool dump-reftable" command.
  reftable: add dump utility
  reftable: implement stack, a mutable database of reftable files.
  reftable: implement refname validation
  reftable: add merged table view
  reftable: add a heap-based priority queue for reftable records
  reftable: reftable file level tests
  reftable: read reftable files
  reftable: generic interface to tables
  reftable: write reftable files
  reftable: a generic binary tree implementation
  reftable: reading/writing blocks
  Provide zlib's uncompress2 from compat/zlib-compat.c
  reftable: (de)serialization for the polymorphic record type.
  reftable: add blocksource, an abstraction for random access reads
  reftable: utility functions
  reftable: add error related functionality
  reftable: add LICENSE
  hash.h: provide constants for the hash IDs

1 files changed, 50 insertions, 0 deletions

diff --git a/reftable/writer.h b/reftable/writer.h
new file mode 100644
index 0000000000..09b88673d9
--- /dev/null
+++ b/reftable/writer.h
@@ -0,0 +1,50 @@
+/*
+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 WRITER_H
+#define WRITER_H
+
+#include "basics.h"
+#include "block.h"
+#include "tree.h"
+#include "reftable-writer.h"
+
+struct reftable_writer {
+	ssize_t (*write)(void *, const void *, size_t);
+	void *write_arg;
+	int pending_padding;
+	struct strbuf last_key;
+
+	/* offset of next block to write. */
+	uint64_t next;
+	uint64_t min_update_index, max_update_index;
+	struct reftable_write_options opts;
+
+	/* memory buffer for writing */
+	uint8_t *block;
+
+	/* writer for the current section. NULL or points to
+	 * block_writer_data */
+	struct block_writer *block_writer;
+
+	struct block_writer block_writer_data;
+
+	/* pending index records for the current section */
+	struct reftable_index_record *index;
+	size_t index_len;
+	size_t index_cap;
+
+	/*
+	 * tree for use with tsearch; used to populate the 'o' inverse OID
+	 * map */
+	struct tree_node *obj_index_tree;
+
+	struct reftable_stats stats;
+};
+
+#endif