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/*
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 REFTABLE_READER_H
#define REFTABLE_READER_H
#include "reftable-iterator.h"
#include "reftable-blocksource.h"
/*
* Reading single tables
*
* The follow routines are for reading single files. For an
* application-level interface, skip ahead to struct
* reftable_merged_table and struct reftable_stack.
*/
/* The reader struct is a handle to an open reftable file. */
struct reftable_reader;
/* Generic table. */
struct reftable_table;
/* reftable_new_reader opens a reftable for reading. If successful,
* returns 0 code and sets pp. The name is used for creating a
* stack. Typically, it is the basename of the file. The block source
* `src` is owned by the reader, and is closed on calling
* reftable_reader_destroy(). On error, the block source `src` is
* closed as well.
*/
int reftable_new_reader(struct reftable_reader **pp,
struct reftable_block_source *src, const char *name);
/* Initialize a reftable iterator for reading refs. */
void reftable_reader_init_ref_iterator(struct reftable_reader *r,
struct reftable_iterator *it);
/* Initialize a reftable iterator for reading logs. */
void reftable_reader_init_log_iterator(struct reftable_reader *r,
struct reftable_iterator *it);
/* returns the hash ID used in this table. */
uint32_t reftable_reader_hash_id(struct reftable_reader *r);
/* closes and deallocates a reader. */
void reftable_reader_free(struct reftable_reader *);
/* return an iterator for the refs pointing to `oid`. */
int reftable_reader_refs_for(struct reftable_reader *r,
struct reftable_iterator *it, uint8_t *oid);
/* return the max_update_index for a table */
uint64_t reftable_reader_max_update_index(struct reftable_reader *r);
/* return the min_update_index for a table */
uint64_t reftable_reader_min_update_index(struct reftable_reader *r);
/* creates a generic table from a file reader. */
void reftable_table_from_reader(struct reftable_table *tab,
struct reftable_reader *reader);
/* print table onto stdout for debugging. */
int reftable_reader_print_file(const char *tablename);
/* print blocks onto stdout for debugging. */
int reftable_reader_print_blocks(const char *tablename);
#endif
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