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   1/*
   2 * Copyright (C) 2005 Junio C Hamano
   3 */
   4#ifndef DIFFCORE_H
   5#define DIFFCORE_H
   6
   7#include "cache.h"
   8
   9struct diff_options;
  10
  11/* This header file is internal between diff.c and its diff transformers
  12 * (e.g. diffcore-rename, diffcore-pickaxe).  Never include this header
  13 * in anything else.
  14 */
  15
  16/* We internally use unsigned short as the score value,
  17 * and rely on an int capable to hold 32-bits.  -B can take
  18 * -Bmerge_score/break_score format and the two scores are
  19 * passed around in one int (high 16-bit for merge and low 16-bit
  20 * for break).
  21 */
  22#define MAX_SCORE 60000.0
  23#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
  24#define DEFAULT_BREAK_SCORE  30000 /* minimum for break to happen (50%) */
  25#define DEFAULT_MERGE_SCORE  36000 /* maximum for break-merge to happen (60%) */
  26
  27#define MINIMUM_BREAK_SIZE     400 /* do not break a file smaller than this */
  28
  29struct userdiff_driver;
  30
  31struct diff_filespec {
  32        struct object_id oid;
  33        char *path;
  34        void *data;
  35        void *cnt_data;
  36        unsigned long size;
  37        int count;               /* Reference count */
  38        int rename_used;         /* Count of rename users */
  39        unsigned short mode;     /* file mode */
  40        unsigned oid_valid : 1;  /* if true, use oid and trust mode;
  41                                  * if false, use the name and read from
  42                                  * the filesystem.
  43                                  */
  44#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
  45        unsigned should_free : 1; /* data should be free()'ed */
  46        unsigned should_munmap : 1; /* data should be munmap()'ed */
  47        unsigned dirty_submodule : 2;  /* For submodules: its work tree is dirty */
  48#define DIRTY_SUBMODULE_UNTRACKED 1
  49#define DIRTY_SUBMODULE_MODIFIED  2
  50        unsigned is_stdin : 1;
  51        unsigned has_more_entries : 1; /* only appear in combined diff */
  52        /* data should be considered "binary"; -1 means "don't know yet" */
  53        signed int is_binary : 2;
  54        struct userdiff_driver *driver;
  55};
  56
  57struct diff_filespec *alloc_filespec(const char *);
  58void free_filespec(struct diff_filespec *);
  59void fill_filespec(struct diff_filespec *, const struct object_id *,
  60                   int, unsigned short);
  61
  62#define CHECK_SIZE_ONLY 1
  63#define CHECK_BINARY    2
  64int diff_populate_filespec(struct diff_filespec *, unsigned int);
  65void diff_free_filespec_data(struct diff_filespec *);
  66void diff_free_filespec_blob(struct diff_filespec *);
  67int diff_filespec_is_binary(struct diff_filespec *);
  68
  69struct diff_filepair {
  70        struct diff_filespec *one;
  71        struct diff_filespec *two;
  72        unsigned short int score;
  73        char status; /* M C R A D U etc. (see Documentation/diff-format.txt or DIFF_STATUS_* in diff.h) */
  74        unsigned broken_pair : 1;
  75        unsigned renamed_pair : 1;
  76        unsigned is_unmerged : 1;
  77        unsigned done_skip_stat_unmatch : 1;
  78        unsigned skip_stat_unmatch_result : 1;
  79};
  80#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
  81
  82#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
  83
  84#define DIFF_PAIR_BROKEN(p) \
  85        ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
  86          ((p)->broken_pair != 0) )
  87
  88#define DIFF_PAIR_TYPE_CHANGED(p) \
  89        ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
  90
  91#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
  92
  93void diff_free_filepair(struct diff_filepair *);
  94
  95int diff_unmodified_pair(struct diff_filepair *);
  96
  97struct diff_queue_struct {
  98        struct diff_filepair **queue;
  99        int alloc;
 100        int nr;
 101};
 102#define DIFF_QUEUE_CLEAR(q) \
 103        do { \
 104                (q)->queue = NULL; \
 105                (q)->nr = (q)->alloc = 0; \
 106        } while (0)
 107
 108extern struct diff_queue_struct diff_queued_diff;
 109struct diff_filepair *diff_queue(struct diff_queue_struct *,
 110                                 struct diff_filespec *,
 111                                 struct diff_filespec *);
 112void diff_q(struct diff_queue_struct *, struct diff_filepair *);
 113
 114void diffcore_break(int);
 115void diffcore_rename(struct diff_options *);
 116void diffcore_merge_broken(void);
 117void diffcore_pickaxe(struct diff_options *);
 118void diffcore_order(const char *orderfile);
 119
 120/* low-level interface to diffcore_order */
 121struct obj_order {
 122        void *obj;      /* setup by caller */
 123
 124        /* setup/used by order_objects() */
 125        int orig_order;
 126        int order;
 127};
 128
 129typedef const char *(*obj_path_fn_t)(void *obj);
 130
 131void order_objects(const char *orderfile, obj_path_fn_t obj_path,
 132                   struct obj_order *objs, int nr);
 133
 134#define DIFF_DEBUG 0
 135#if DIFF_DEBUG
 136void diff_debug_filespec(struct diff_filespec *, int, const char *);
 137void diff_debug_filepair(const struct diff_filepair *, int);
 138void diff_debug_queue(const char *, struct diff_queue_struct *);
 139#else
 140#define diff_debug_filespec(a,b,c) do { /* nothing */ } while (0)
 141#define diff_debug_filepair(a,b) do { /* nothing */ } while (0)
 142#define diff_debug_queue(a,b) do { /* nothing */ } while (0)
 143#endif
 144
 145int diffcore_count_changes(struct diff_filespec *src,
 146                           struct diff_filespec *dst,
 147                           void **src_count_p,
 148                           void **dst_count_p,
 149                           unsigned long *src_copied,
 150                           unsigned long *literal_added);
 151
 152#endif