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1 | /* |
2 | Copyright 2020 Google LLC | |
3 | ||
4 | Use of this source code is governed by a BSD-style | |
5 | license that can be found in the LICENSE file or at | |
6 | https://developers.google.com/open-source/licenses/bsd | |
7 | */ | |
8 | ||
9 | #ifndef READER_H | |
10 | #define READER_H | |
11 | ||
12 | #include "block.h" | |
13 | #include "record.h" | |
14 | #include "reftable-iterator.h" | |
15 | #include "reftable-reader.h" | |
16 | ||
17 | uint64_t block_source_size(struct reftable_block_source *source); | |
18 | ||
19 | int block_source_read_block(struct reftable_block_source *source, | |
20 | struct reftable_block *dest, uint64_t off, | |
21 | uint32_t size); | |
22 | void block_source_close(struct reftable_block_source *source); | |
23 | ||
24 | /* metadata for a block type */ | |
25 | struct reftable_reader_offsets { | |
26 | int is_present; | |
27 | uint64_t offset; | |
28 | uint64_t index_offset; | |
29 | }; | |
30 | ||
31 | /* The state for reading a reftable file. */ | |
32 | struct reftable_reader { | |
33 | /* for convience, associate a name with the instance. */ | |
34 | char *name; | |
35 | struct reftable_block_source source; | |
36 | ||
37 | /* Size of the file, excluding the footer. */ | |
38 | uint64_t size; | |
39 | ||
40 | /* 'sha1' for SHA1, 's256' for SHA-256 */ | |
41 | uint32_t hash_id; | |
42 | ||
43 | uint32_t block_size; | |
44 | uint64_t min_update_index; | |
45 | uint64_t max_update_index; | |
46 | /* Length of the OID keys in the 'o' section */ | |
47 | int object_id_len; | |
48 | int version; | |
49 | ||
50 | struct reftable_reader_offsets ref_offsets; | |
51 | struct reftable_reader_offsets obj_offsets; | |
52 | struct reftable_reader_offsets log_offsets; | |
53 | }; | |
54 | ||
55 | int init_reader(struct reftable_reader *r, struct reftable_block_source *source, | |
56 | const char *name); | |
57 | void reader_close(struct reftable_reader *r); | |
58 | const char *reader_name(struct reftable_reader *r); | |
59 | ||
60 | /* initialize a block reader to read from `r` */ | |
61 | int reader_init_block_reader(struct reftable_reader *r, struct block_reader *br, | |
62 | uint64_t next_off, uint8_t want_typ); | |
63 | ||
64 | #endif |