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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 READER_H
#define READER_H
#include "block.h"
#include "record.h"
#include "reftable.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);
int reader_seek(struct reftable_reader *r, struct reftable_iterator *it,
struct reftable_record *rec);
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);
/* generic interface to reftables */
struct reftable_table_vtable {
int (*seek_record)(void *tab, struct reftable_iterator *it,
struct reftable_record *);
uint32_t (*hash_id)(void *tab);
uint64_t (*min_update_index)(void *tab);
uint64_t (*max_update_index)(void *tab);
};
int reftable_table_seek_record(struct reftable_table *tab,
struct reftable_iterator *it,
struct reftable_record *rec);
#endif
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