46bc0e731a
This supports reading a single reftable file. The commit introduces an abstract iterator type, which captures the usecases both of reading individual refs, and iterating over a segment of the ref namespace. Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
|
|
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
|