diff options
Diffstat (limited to 'src/or/consdiff.h')
| -rw-r--r-- | src/or/consdiff.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/or/consdiff.h b/src/or/consdiff.h new file mode 100644 index 0000000000..eb772c0b2b --- /dev/null +++ b/src/or/consdiff.h @@ -0,0 +1,98 @@ +/* Copyright (c) 2014, Daniel Martà + * Copyright (c) 2014, The Tor Project, Inc. */ +/* See LICENSE for licensing information */ + +#ifndef TOR_CONSDIFF_H +#define TOR_CONSDIFF_H + +#include "or.h" + +char *consensus_diff_generate(const char *cons1, + const char *cons2); +char *consensus_diff_apply(const char *consensus, + const char *diff); + +int looks_like_a_consensus_diff(const char *document, size_t len); + +#ifdef CONSDIFF_PRIVATE +struct memarea_t; + +/** Line type used for constructing consensus diffs. Each of these lines + * refers to a chunk of memory allocated elsewhere, and is not necessarily + * NUL-terminated: this helps us avoid copies and save memory. */ +typedef struct cdline_t { + const char *s; + uint32_t len; +} cdline_t; + +typedef struct consensus_digest_t { + uint8_t sha3_256[DIGEST256_LEN]; +} consensus_digest_t; + +STATIC smartlist_t *consdiff_gen_diff(const smartlist_t *cons1, + const smartlist_t *cons2, + const consensus_digest_t *digests1, + const consensus_digest_t *digests2, + struct memarea_t *area); +STATIC char *consdiff_apply_diff(const smartlist_t *cons1, + const smartlist_t *diff, + const consensus_digest_t *digests1); +STATIC int consdiff_get_digests(const smartlist_t *diff, + char *digest1_out, + char *digest2_out); + +/** Data structure to define a slice of a smarltist. */ +typedef struct smartlist_slice_t { + /** + * Smartlist that this slice is made from. + * References the whole original smartlist that the slice was made out of. + * */ + const smartlist_t *list; + /** Starting position of the slice in the smartlist. */ + int offset; + /** Length of the slice, i.e. the number of elements it holds. */ + int len; +} smartlist_slice_t; +STATIC smartlist_t *gen_ed_diff(const smartlist_t *cons1, + const smartlist_t *cons2, + struct memarea_t *area); +STATIC smartlist_t *apply_ed_diff(const smartlist_t *cons1, + const smartlist_t *diff, + int start_line); +STATIC void calc_changes(smartlist_slice_t *slice1, smartlist_slice_t *slice2, + bitarray_t *changed1, bitarray_t *changed2); +STATIC smartlist_slice_t *smartlist_slice(const smartlist_t *list, + int start, int end); +STATIC int next_router(const smartlist_t *cons, int cur); +STATIC int *lcs_lengths(const smartlist_slice_t *slice1, + const smartlist_slice_t *slice2, + int direction); +STATIC void trim_slices(smartlist_slice_t *slice1, smartlist_slice_t *slice2); +STATIC int base64cmp(const cdline_t *hash1, const cdline_t *hash2); +STATIC int get_id_hash(const cdline_t *line, cdline_t *hash_out); +STATIC int is_valid_router_entry(const cdline_t *line); +STATIC int smartlist_slice_string_pos(const smartlist_slice_t *slice, + const cdline_t *string); +STATIC void set_changed(bitarray_t *changed1, bitarray_t *changed2, + const smartlist_slice_t *slice1, + const smartlist_slice_t *slice2); +STATIC int consensus_split_lines(smartlist_t *out, const char *s, + struct memarea_t *area); +STATIC void smartlist_add_linecpy(smartlist_t *lst, struct memarea_t *area, + const char *s); +STATIC int lines_eq(const cdline_t *a, const cdline_t *b); +STATIC int line_str_eq(const cdline_t *a, const char *b); + +MOCK_DECL(STATIC int, + consensus_compute_digest,(const char *cons, + consensus_digest_t *digest_out)); +MOCK_DECL(STATIC int, + consensus_compute_digest_as_signed,(const char *cons, + consensus_digest_t *digest_out)); +MOCK_DECL(STATIC int, + consensus_digest_eq,(const uint8_t *d1, + const uint8_t *d2)); +#endif /* defined(CONSDIFF_PRIVATE) */ + +#endif /* !defined(TOR_CONSDIFF_H) */ + |