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 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 };
  58 #define DIFF_PAIR_UNMERGED(p) \
  59         (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
  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