Tor 0.4.9.1-alpha-dev
consdiff.h
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1/* Copyright (c) 2014, Daniel Martí
2 * Copyright (c) 2014-2021, The Tor Project, Inc. */
3/* See LICENSE for licensing information */
4
5/**
6 * @file consdiff.h
7 * @brief Header for consdiff.c
8 **/
9
10#ifndef TOR_CONSDIFF_H
11#define TOR_CONSDIFF_H
12
13#include "core/or/or.h"
14
15char *consensus_diff_generate(const char *cons1, size_t cons1len,
16 const char *cons2, size_t cons2len);
17char *consensus_diff_apply(const char *consensus, size_t consensus_len,
18 const char *diff, size_t diff_len);
19
20int looks_like_a_consensus_diff(const char *document, size_t len);
21
22#ifdef CONSDIFF_PRIVATE
24
25struct memarea_t;
26
27/** Line type used for constructing consensus diffs. Each of these lines
28 * refers to a chunk of memory allocated elsewhere, and is not necessarily
29 * NUL-terminated: this helps us avoid copies and save memory. */
30typedef struct cdline_t {
31 const char *s;
32 uint32_t len;
33} cdline_t;
34
35typedef struct consensus_digest_t {
36 uint8_t sha3_256[DIGEST256_LEN];
37} consensus_digest_t;
38
40 const smartlist_t *cons2,
41 const consensus_digest_t *digests1,
42 const consensus_digest_t *digests2,
43 struct memarea_t *area);
44STATIC char *consdiff_apply_diff(const smartlist_t *cons1,
45 const smartlist_t *diff,
46 const consensus_digest_t *digests1);
48 char *digest1_out,
49 char *digest2_out);
50
51/** Data structure to define a slice of a smarltist. */
52typedef struct smartlist_slice_t {
53 /**
54 * Smartlist that this slice is made from.
55 * References the whole original smartlist that the slice was made out of.
56 * */
57 const smartlist_t *list;
58 /** Starting position of the slice in the smartlist. */
59 int offset;
60 /** Length of the slice, i.e. the number of elements it holds. */
61 int len;
62} smartlist_slice_t;
64 const smartlist_t *cons2,
65 struct memarea_t *area);
67 const smartlist_t *diff,
68 int start_line);
69STATIC void calc_changes(smartlist_slice_t *slice1, smartlist_slice_t *slice2,
70 bitarray_t *changed1, bitarray_t *changed2);
71STATIC smartlist_slice_t *smartlist_slice(const smartlist_t *list,
72 int start, int end);
73STATIC int next_router(const smartlist_t *cons, int cur);
74STATIC int *lcs_lengths(const smartlist_slice_t *slice1,
75 const smartlist_slice_t *slice2,
76 int direction);
77STATIC void trim_slices(smartlist_slice_t *slice1, smartlist_slice_t *slice2);
78STATIC int base64cmp(const cdline_t *hash1, const cdline_t *hash2);
79STATIC int get_id_hash(const cdline_t *line, cdline_t *hash_out);
80STATIC int is_valid_router_entry(const cdline_t *line);
81STATIC int smartlist_slice_string_pos(const smartlist_slice_t *slice,
82 const cdline_t *string);
83STATIC void set_changed(bitarray_t *changed1, bitarray_t *changed2,
84 const smartlist_slice_t *slice1,
85 const smartlist_slice_t *slice2);
87 const char *s, size_t len,
88 struct memarea_t *area);
90 const char *s);
91STATIC int lines_eq(const cdline_t *a, const cdline_t *b);
92STATIC int line_str_eq(const cdline_t *a, const char *b);
93
95 consensus_compute_digest,(const char *cons, size_t len,
96 consensus_digest_t *digest_out));
98 consensus_compute_digest_as_signed,(const char *cons, size_t len,
99 consensus_digest_t *digest_out));
100MOCK_DECL(STATIC int,
101 consensus_digest_eq,(const uint8_t *d1,
102 const uint8_t *d2));
103#endif /* defined(CONSDIFF_PRIVATE) */
104
105#endif /* !defined(TOR_CONSDIFF_H) */
Implements a variable-sized (but non-resizeable) bit-array.
unsigned int bitarray_t
Definition: bitarray.h:30
STATIC void smartlist_add_linecpy(smartlist_t *lst, memarea_t *area, const char *s)
Definition: consdiff.c:94
STATIC int line_str_eq(const cdline_t *a, const char *b)
Definition: consdiff.c:60
STATIC int * lcs_lengths(const smartlist_slice_t *slice1, const smartlist_slice_t *slice2, int direction)
Definition: consdiff.c:165
char * consdiff_apply_diff(const smartlist_t *cons1, const smartlist_t *diff, const consensus_digest_t *digests1)
Definition: consdiff.c:1192
STATIC void trim_slices(smartlist_slice_t *slice1, smartlist_slice_t *slice2)
Definition: consdiff.c:213
STATIC smartlist_t * apply_ed_diff(const smartlist_t *cons1, const smartlist_t *diff, int diff_starting_line)
Definition: consdiff.c:859
STATIC void set_changed(bitarray_t *changed1, bitarray_t *changed2, const smartlist_slice_t *slice1, const smartlist_slice_t *slice2)
Definition: consdiff.c:264
STATIC int consensus_digest_eq(const uint8_t *d1, const uint8_t *d2)
Definition: consdiff.c:129
STATIC int base64cmp(const cdline_t *hash1, const cdline_t *hash2)
Definition: consdiff.c:472
STATIC int next_router(const smartlist_t *cons, int cur)
Definition: consdiff.c:449
STATIC void calc_changes(smartlist_slice_t *slice1, smartlist_slice_t *slice2, bitarray_t *changed1, bitarray_t *changed2)
Definition: consdiff.c:327
STATIC int consensus_compute_digest_as_signed(const char *cons, size_t len, consensus_digest_t *digest_out)
Definition: consdiff.c:118
smartlist_t * consdiff_gen_diff(const smartlist_t *cons1, const smartlist_t *cons2, const consensus_digest_t *digests1, const consensus_digest_t *digests2, memarea_t *area)
Definition: consdiff.c:1026
STATIC int is_valid_router_entry(const cdline_t *line)
Definition: consdiff.c:435
STATIC smartlist_t * gen_ed_diff(const smartlist_t *cons1_orig, const smartlist_t *cons2, memarea_t *area)
Definition: consdiff.c:625
STATIC int consensus_split_lines(smartlist_t *out, const char *s, size_t len, memarea_t *area)
Definition: consdiff.c:1289
STATIC smartlist_slice_t * smartlist_slice(const smartlist_t *list, int start, int end)
Definition: consdiff.c:140
STATIC int get_id_hash(const cdline_t *line, cdline_t *hash_out)
Definition: consdiff.c:395
STATIC int lines_eq(const cdline_t *a, const cdline_t *b)
Definition: consdiff.c:53
STATIC int smartlist_slice_string_pos(const smartlist_slice_t *slice, const cdline_t *string)
Definition: consdiff.c:245
int consdiff_get_digests(const smartlist_t *diff, char *digest1_out, char *digest2_out)
Definition: consdiff.c:1106
STATIC int consensus_compute_digest(const char *cons, size_t len, consensus_digest_t *digest_out)
Definition: consdiff.c:105
char * consensus_diff_generate(const char *cons1, size_t cons1len, const char *cons2, size_t cons2len)
Definition: consdiff.c:1341
char * consensus_diff_apply(const char *consensus, size_t consensus_len, const char *diff, size_t diff_len)
Definition: consdiff.c:1381
int looks_like_a_consensus_diff(const char *document, size_t len)
Definition: consdiff.c:1416
#define DIGEST256_LEN
Definition: digest_sizes.h:23
Master header file for Tor-specific functionality.
#define STATIC
Definition: testsupport.h:32
#define MOCK_DECL(rv, funcname, arglist)
Definition: testsupport.h:127