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 #define MAX_SCORE 10000
  12 #define DEFAULT_MINIMUM_SCORE 5000
  13
  14 #define RENAME_DST_MATCHED 01
  15 #define RENAME_SRC_GONE    02
  16 #define RENAME_SCORE_SHIFT 8
  17
  18 struct diff_filespec {
  19         unsigned char sha1[20];
  20         char *path;
  21         void *data;
  22         unsigned long size;
  23         int xfrm_flags;          /* for use by the xfrm */
  24         unsigned short mode;     /* file mode */
  25         unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
  26                                   * if false, use the name and read from
  27                                   * the filesystem.
  28                                   */
  29 #define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
  30         unsigned should_free : 1; /* data should be free()'ed */
  31         unsigned should_munmap : 1; /* data should be munmap()'ed */
  32 };
  33
  34 extern struct diff_filespec *alloc_filespec(const char *);
  35 extern void fill_filespec(struct diff_filespec *, const unsigned char *,
  36                           unsigned short);
  37
  38 extern int diff_populate_filespec(struct diff_filespec *);
  39 extern void diff_free_filespec_data(struct diff_filespec *);
  40
  41 struct diff_filepair {
  42         struct diff_filespec *one;
  43         struct diff_filespec *two;
  44         int score; /* only valid when one and two are different paths */
  45         int orig_order; /* the original order of insertion into the queue */
  46         int rename_rank; /* rename/copy dependency needs to enforce
  47                           * certain ordering of patches that later
  48                           * diffcore transformations should not break.
  49                           */
  50 };
  51 #define DIFF_PAIR_UNMERGED(p) \
  52         (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
  53
  54 extern int diff_unmodified_pair(struct diff_filepair *);
  55
  56 struct diff_queue_struct {
  57         struct diff_filepair **queue;
  58         int alloc;
  59         int nr;
  60 };
  61
  62 extern struct diff_queue_struct diff_queued_diff;
  63 extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
  64                                         struct diff_filespec *,
  65                                         struct diff_filespec *);
  66 extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
  67
  68 extern int diff_needs_to_stay(struct diff_queue_struct *, int,
  69                               struct diff_filespec *);
  70
  71 #endif