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/*
 * Copyright (C) 2005 Junio C Hamano
 */
#ifndef _DIFFCORE_H_
#define _DIFFCORE_H_
 
/* This header file is internal between diff.c and its diff transformers
 * (e.g. diffcore-rename, diffcore-pickaxe).  Never include this header
 * in anything else.
 */
#define MAX_SCORE 10000
#define DEFAULT_MINIMUM_SCORE 5000
 
#define RENAME_DST_MATCHED 01
 
struct diff_filespec {
	unsigned char sha1[20];
	char *path;
	void *data;
	unsigned long size;
	int xfrm_flags;		 /* for use by the xfrm */
	unsigned short mode;	 /* file mode */
	unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
				  * if false, use the name and read from
				  * the filesystem.
				  */
#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
	unsigned should_free : 1; /* data should be free()'ed */
	unsigned should_munmap : 1; /* data should be munmap()'ed */
};
 
extern struct diff_filespec *alloc_filespec(const char *);
extern void fill_filespec(struct diff_filespec *, const unsigned char *,
			  unsigned short);
 
extern int diff_populate_filespec(struct diff_filespec *);
extern void diff_free_filespec_data(struct diff_filespec *);
 
struct diff_filepair {
	struct diff_filespec *one;
	struct diff_filespec *two;
	int score; /* only valid when one and two are different paths */
	int orig_order; /* the original order of insertion into the queue */
	int rename_rank; /* rename/copy dependency needs to enforce
			  * certain ordering of patches that later
			  * diffcore transformations should not break.
			  */
	int status; /* M C R N D U (see Documentation/diff-format.txt) */
};
#define DIFF_PAIR_UNMERGED(p) \
	(!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
 
extern int diff_unmodified_pair(struct diff_filepair *);
 
struct diff_queue_struct {
	struct diff_filepair **queue;
	int alloc;
	int nr;
};
 
extern struct diff_queue_struct diff_queued_diff;
extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
					struct diff_filespec *,
					struct diff_filespec *);
extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
 
extern int diff_needs_to_stay(struct diff_queue_struct *, int,
			      struct diff_filespec *);
 
#endif