Andrew's git - gitweb.git/blob

   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
  25struct diff_filespec {
  26        unsigned char sha1[20];
  27        char *path;
  28        void *data;
  29        void *cnt_data;
  30        const char *funcname_pattern_ident;
  31        unsigned long size;
  32        int xfrm_flags;          /* for use by the xfrm */
  33        unsigned short mode;     /* file mode */
  34        unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
  35                                  * if false, use the name and read from
  36                                  * the filesystem.
  37                                  */
  38#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
  39        unsigned should_free : 1; /* data should be free()'ed */
  40        unsigned should_munmap : 1; /* data should be munmap()'ed */
  41        unsigned checked_attr : 1;
  42        unsigned is_binary : 1; /* data should be considered "binary" */
  43};
  44
  45extern struct diff_filespec *alloc_filespec(const char *);
  46extern void fill_filespec(struct diff_filespec *, const unsigned char *,
  47                          unsigned short);
  48
  49extern int diff_populate_filespec(struct diff_filespec *, int);
  50extern void diff_free_filespec_data(struct diff_filespec *);
  51extern int diff_filespec_is_binary(struct diff_filespec *);
  52
  53struct diff_filepair {
  54        struct diff_filespec *one;
  55        struct diff_filespec *two;
  56        unsigned short int score;
  57        char status; /* M C R N D U (see Documentation/diff-format.txt) */
  58        unsigned source_stays : 1; /* all of R/C are copies */
  59        unsigned broken_pair : 1;
  60        unsigned renamed_pair : 1;
  61        unsigned is_unmerged : 1;
  62};
  63#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
  64
  65#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
  66
  67#define DIFF_PAIR_BROKEN(p) \
  68        ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
  69          ((p)->broken_pair != 0) )
  70
  71#define DIFF_PAIR_TYPE_CHANGED(p) \
  72        ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
  73
  74#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
  75
  76extern void diff_free_filepair(struct diff_filepair *);
  77
  78extern int diff_unmodified_pair(struct diff_filepair *);
  79
  80struct diff_queue_struct {
  81        struct diff_filepair **queue;
  82        int alloc;
  83        int nr;
  84};
  85
  86extern struct diff_queue_struct diff_queued_diff;
  87extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
  88                                        struct diff_filespec *,
  89                                        struct diff_filespec *);
  90extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
  91
  92extern void diffcore_pathspec(const char **pathspec);
  93extern void diffcore_break(int);
  94extern void diffcore_rename(struct diff_options *);
  95extern void diffcore_merge_broken(void);
  96extern void diffcore_pickaxe(const char *needle, int opts);
  97extern void diffcore_order(const char *orderfile);
  98
  99#define DIFF_DEBUG 0
 100#if DIFF_DEBUG
 101void diff_debug_filespec(struct diff_filespec *, int, const char *);
 102void diff_debug_filepair(const struct diff_filepair *, int);
 103void diff_debug_queue(const char *, struct diff_queue_struct *);
 104#else
 105#define diff_debug_filespec(a,b,c) do {} while(0)
 106#define diff_debug_filepair(a,b) do {} while(0)
 107#define diff_debug_queue(a,b) do {} while(0)
 108#endif
 109
 110extern int diffcore_count_changes(struct diff_filespec *src,
 111                                  struct diff_filespec *dst,
 112                                  void **src_count_p,
 113                                  void **dst_count_p,
 114                                  unsigned long delta_limit,
 115                                  unsigned long *src_copied,
 116                                  unsigned long *literal_added);
 117
 118#endif