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1 | /* | |
2 | * Copyright (C) 2005 Junio C Hamano | |
3 | */ | |
4 | #ifndef _DIFFCORE_H_ | |
5 | #define _DIFFCORE_H_ | |
6 | ||
7 | /* This header file is internal between diff.c and its diff transformers | |
8 | * (e.g. diffcore-rename, diffcore-pickaxe). Never include this header | |
9 | * in anything else. | |
10 | */ | |
11 | ||
12 | /* We internally use unsigned short as the score value, | |
13 | * and rely on an int capable to hold 32-bits. -B can take | |
14 | * -Bmerge_score/break_score format and the two scores are | |
15 | * passed around in one int (high 16-bit for merge and low 16-bit | |
16 | * for break). | |
17 | */ | |
18 | #define MAX_SCORE 60000.0 | |
19 | #define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */ | |
20 | #define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */ | |
21 | #define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen 60%) */ | |
22 | ||
23 | #define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */ | |
24 | ||
25 | struct diff_filespec { | |
26 | unsigned char sha1[20]; | |
27 | char *path; | |
28 | void *data; | |
29 | void *cnt_data; | |
30 | unsigned long size; | |
31 | int xfrm_flags; /* for use by the xfrm */ | |
32 | unsigned short mode; /* file mode */ | |
33 | unsigned sha1_valid : 1; /* if true, use sha1 and trust mode; | |
34 | * if false, use the name and read from | |
35 | * the filesystem. | |
36 | */ | |
37 | #define DIFF_FILE_VALID(spec) (((spec)->mode) != 0) | |
38 | unsigned should_free : 1; /* data should be free()'ed */ | |
39 | unsigned should_munmap : 1; /* data should be munmap()'ed */ | |
40 | }; | |
41 | ||
42 | extern struct diff_filespec *alloc_filespec(const char *); | |
43 | extern void fill_filespec(struct diff_filespec *, const unsigned char *, | |
44 | unsigned short); | |
45 | ||
46 | extern int diff_populate_filespec(struct diff_filespec *, int); | |
47 | extern void diff_free_filespec_data(struct diff_filespec *); | |
48 | ||
49 | struct diff_filepair { | |
50 | struct diff_filespec *one; | |
51 | struct diff_filespec *two; | |
52 | unsigned short int score; | |
53 | char status; /* M C R N D U (see Documentation/diff-format.txt) */ | |
54 | unsigned source_stays : 1; /* all of R/C are copies */ | |
55 | unsigned broken_pair : 1; | |
56 | unsigned renamed_pair : 1; | |
57 | unsigned is_unmerged : 1; | |
58 | }; | |
59 | #define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged) | |
60 | ||
61 | #define DIFF_PAIR_RENAME(p) ((p)->renamed_pair) | |
62 | ||
63 | #define DIFF_PAIR_BROKEN(p) \ | |
64 | ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \ | |
65 | ((p)->broken_pair != 0) ) | |
66 | ||
67 | #define DIFF_PAIR_TYPE_CHANGED(p) \ | |
68 | ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode)) | |
69 | ||
70 | #define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode) | |
71 | ||
72 | extern void diff_free_filepair(struct diff_filepair *); | |
73 | ||
74 | extern int diff_unmodified_pair(struct diff_filepair *); | |
75 | ||
76 | struct diff_queue_struct { | |
77 | struct diff_filepair **queue; | |
78 | int alloc; | |
79 | int nr; | |
80 | }; | |
81 | ||
82 | extern struct diff_queue_struct diff_queued_diff; | |
83 | extern struct diff_filepair *diff_queue(struct diff_queue_struct *, | |
84 | struct diff_filespec *, | |
85 | struct diff_filespec *); | |
86 | extern void diff_q(struct diff_queue_struct *, struct diff_filepair *); | |
87 | ||
88 | extern void diffcore_pathspec(const char **pathspec); | |
89 | extern void diffcore_break(int); | |
90 | extern void diffcore_rename(struct diff_options *); | |
91 | extern void diffcore_merge_broken(void); | |
92 | extern void diffcore_pickaxe(const char *needle, int opts); | |
93 | extern void diffcore_order(const char *orderfile); | |
94 | ||
95 | #define DIFF_DEBUG 0 | |
96 | #if DIFF_DEBUG | |
97 | void diff_debug_filespec(struct diff_filespec *, int, const char *); | |
98 | void diff_debug_filepair(const struct diff_filepair *, int); | |
99 | void diff_debug_queue(const char *, struct diff_queue_struct *); | |
100 | #else | |
101 | #define diff_debug_filespec(a,b,c) do {} while(0) | |
102 | #define diff_debug_filepair(a,b) do {} while(0) | |
103 | #define diff_debug_queue(a,b) do {} while(0) | |
104 | #endif | |
105 | ||
106 | extern int diffcore_count_changes(void *src, unsigned long src_size, | |
107 | void *dst, unsigned long dst_size, | |
108 | void **src_count_p, | |
109 | void **dst_count_p, | |
110 | unsigned long delta_limit, | |
111 | unsigned long *src_copied, | |
112 | unsigned long *literal_added); | |
113 | ||
114 | #endif |