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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 */
  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        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
  42extern struct diff_filespec *alloc_filespec(const char *);
  43extern void fill_filespec(struct diff_filespec *, const unsigned char *,
  44                          unsigned short);
  45
  46extern int diff_populate_filespec(struct diff_filespec *, int);
  47extern void diff_free_filespec_data(struct diff_filespec *);
  48
  49struct 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};
  57#define DIFF_PAIR_UNMERGED(p) \
  58        (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
  59
  60#define DIFF_PAIR_RENAME(p) (strcmp((p)->one->path, (p)->two->path))
  61
  62#define DIFF_PAIR_BROKEN(p) \
  63        ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
  64          ((p)->broken_pair != 0) )
  65
  66#define DIFF_PAIR_TYPE_CHANGED(p) \
  67        ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
  68
  69#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
  70
  71extern void diff_free_filepair(struct diff_filepair *);
  72
  73extern int diff_unmodified_pair(struct diff_filepair *);
  74
  75struct diff_queue_struct {
  76        struct diff_filepair **queue;
  77        int alloc;
  78        int nr;
  79};
  80
  81extern struct diff_queue_struct diff_queued_diff;
  82extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
  83                                        struct diff_filespec *,
  84                                        struct diff_filespec *);
  85extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
  86
  87extern void diffcore_pathspec(const char **pathspec);
  88extern void diffcore_break(int);
  89extern void diffcore_rename(struct diff_options *);
  90extern void diffcore_merge_broken(void);
  91extern void diffcore_pickaxe(const char *needle, int opts);
  92extern void diffcore_order(const char *orderfile);
  93
  94#define DIFF_DEBUG 0
  95#if DIFF_DEBUG
  96void diff_debug_filespec(struct diff_filespec *, int, const char *);
  97void diff_debug_filepair(const struct diff_filepair *, int);
  98void diff_debug_queue(const char *, struct diff_queue_struct *);
  99#else
 100#define diff_debug_filespec(a,b,c) do {} while(0)
 101#define diff_debug_filepair(a,b) do {} while(0)
 102#define diff_debug_queue(a,b) do {} while(0)
 103#endif
 104
 105extern int diffcore_count_changes(void *src, unsigned long src_size,
 106                                  void *dst, unsigned long dst_size,
 107                                  void **src_count_p,
 108                                  void **dst_count_p,
 109                                  unsigned long delta_limit,
 110                                  unsigned long *src_copied,
 111                                  unsigned long *literal_added);
 112
 113#endif