diffcore.h

   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 userdiff_driver;
  26
  27 struct diff_filespec {
  28         unsigned char sha1[20];
  29         char *path;
  30         void *data;
  31         void *cnt_data;
  32         const char *funcname_pattern_ident;
  33         unsigned long size;
  34         int count;               /* Reference count */
  35         int xfrm_flags;          /* for use by the xfrm */
  36         int rename_used;         /* Count of rename users */
  37         unsigned short mode;     /* file mode */
  38         unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
  39                                   * if false, use the name and read from
  40                                   * the filesystem.
  41                                   */
  42 #define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
  43         unsigned should_free : 1; /* data should be free()'ed */
  44         unsigned should_munmap : 1; /* data should be munmap()'ed */
  45
  46         struct userdiff_driver *driver;
  47         /* data should be considered "binary"; -1 means "don't know yet" */
  48         int is_binary;
  49 };
  50
  51 extern struct diff_filespec *alloc_filespec(const char *);
  52 extern void free_filespec(struct diff_filespec *);
  53 extern void fill_filespec(struct diff_filespec *, const unsigned char *,
  54                           unsigned short);
  55
  56 extern int diff_populate_filespec(struct diff_filespec *, int);
  57 extern void diff_free_filespec_data(struct diff_filespec *);
  58 extern void diff_free_filespec_blob(struct diff_filespec *);
  59 extern int diff_filespec_is_binary(struct diff_filespec *);
  60
  61 struct diff_filepair {
  62         struct diff_filespec *one;
  63         struct diff_filespec *two;
  64         unsigned short int score;
  65         char status; /* M C R A D U etc. (see Documentation/diff-format.txt or DIFF_STATUS_* in diff.h) */
  66         unsigned broken_pair : 1;
  67         unsigned renamed_pair : 1;
  68         unsigned is_unmerged : 1;
  69 };
  70 #define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
  71
  72 #define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
  73
  74 #define DIFF_PAIR_BROKEN(p) \
  75         ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
  76           ((p)->broken_pair != 0) )
  77
  78 #define DIFF_PAIR_TYPE_CHANGED(p) \
  79         ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
  80
  81 #define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
  82
  83 extern void diff_free_filepair(struct diff_filepair *);
  84
  85 extern int diff_unmodified_pair(struct diff_filepair *);
  86
  87 struct diff_queue_struct {
  88         struct diff_filepair **queue;
  89         int alloc;
  90         int nr;
  91 };
  92
  93 extern struct diff_queue_struct diff_queued_diff;
  94 extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
  95                                         struct diff_filespec *,
  96                                         struct diff_filespec *);
  97 extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
  98
  99 extern void diffcore_break(int);
 100 extern void diffcore_rename(struct diff_options *);
 101 extern void diffcore_merge_broken(void);
 102 extern void diffcore_pickaxe(const char *needle, int opts);
 103 extern void diffcore_order(const char *orderfile);
 104
 105 #define DIFF_DEBUG 0
 106 #if DIFF_DEBUG
 107 void diff_debug_filespec(struct diff_filespec *, int, const char *);
 108 void diff_debug_filepair(const struct diff_filepair *, int);
 109 void diff_debug_queue(const char *, struct diff_queue_struct *);
 110 #else
 111 #define diff_debug_filespec(a,b,c) do {} while(0)
 112 #define diff_debug_filepair(a,b) do {} while(0)
 113 #define diff_debug_queue(a,b) do {} while(0)
 114 #endif
 115
 116 extern int diffcore_count_changes(struct diff_filespec *src,
 117                                   struct diff_filespec *dst,
 118                                   void **src_count_p,
 119                                   void **dst_count_p,
 120                                   unsigned long delta_limit,
 121                                   unsigned long *src_copied,
 122                                   unsigned long *literal_added);
 123
 124 #endif