git-apply: ignore empty git headers
[git/git.git] / diffcore.h
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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 */
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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 */
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18#define MAX_SCORE 60000
19#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
f78c79c5 20#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%)*/
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21#define DEFAULT_MERGE_SCORE 48000 /* maximum for break-merge to happen (80%)*/
22
23#define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */
427dcb4b 24
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25struct diff_filespec {
26 unsigned char sha1[20];
27 char *path;
28 void *data;
29 unsigned long size;
30 int xfrm_flags; /* for use by the xfrm */
31 unsigned short mode; /* file mode */
32 unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
33 * if false, use the name and read from
34 * the filesystem.
35 */
f9e77506 36#define DIFF_FILE_VALID(spec) ((spec) && ((spec)->mode) != 0)
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37 unsigned should_free : 1; /* data should be free()'ed */
38 unsigned should_munmap : 1; /* data should be munmap()'ed */
39};
40
41extern struct diff_filespec *alloc_filespec(const char *);
42extern void fill_filespec(struct diff_filespec *, const unsigned char *,
43 unsigned short);
44
f0c6b2a2 45extern int diff_populate_filespec(struct diff_filespec *, int);
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46extern void diff_free_filespec_data(struct diff_filespec *);
47
52e95789 48struct diff_filepair {
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49 struct diff_filespec *one;
50 struct diff_filespec *two;
01c4e70f 51 unsigned short int score;
15d061b4 52 char status; /* M C R N D U (see Documentation/diff-format.txt) */
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53 unsigned source_stays : 1; /* all of R/C are copies */
54 unsigned broken_pair : 1;
427dcb4b 55};
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56#define DIFF_PAIR_UNMERGED(p) \
57 (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
427dcb4b 58
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59#define DIFF_PAIR_RENAME(p) (strcmp((p)->one->path, (p)->two->path))
60
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61#define DIFF_PAIR_BROKEN(p) \
62 ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
63 ((p)->broken_pair != 0) )
64
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65#define DIFF_PAIR_TYPE_CHANGED(p) \
66 ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
67
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68#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
69
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70extern void diff_free_filepair(struct diff_filepair *);
71
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72extern int diff_unmodified_pair(struct diff_filepair *);
73
427dcb4b 74struct diff_queue_struct {
52e95789 75 struct diff_filepair **queue;
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76 int alloc;
77 int nr;
78};
79
38c6f780 80extern struct diff_queue_struct diff_queued_diff;
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81extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
82 struct diff_filespec *,
83 struct diff_filespec *);
6b14d7fa 84extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
f7c1512a 85
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86extern void diffcore_pathspec(const char **pathspec);
87extern void diffcore_break(int);
88extern void diffcore_rename(int rename_copy, int);
eeaa4603 89extern void diffcore_merge_broken(void);
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90extern void diffcore_pickaxe(const char *needle, int opts);
91extern void diffcore_order(const char *orderfile);
92
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93#define DIFF_DEBUG 0
94#if DIFF_DEBUG
95void diff_debug_filespec(struct diff_filespec *, int, const char *);
96void diff_debug_filepair(const struct diff_filepair *, int);
97void diff_debug_queue(const char *, struct diff_queue_struct *);
98#else
99#define diff_debug_filespec(a,b,c) do {} while(0)
100#define diff_debug_filepair(a,b) do {} while(0)
101#define diff_debug_queue(a,b) do {} while(0)
102#endif
103
427dcb4b 104#endif