mercurial/mpatch.h

copies: correctly skip directories that have already been considered

Previously, `if dsrc in invalid` would never be true, since we added
`dsrc +"/"` to invalid, not `dsrc` itself. Since it's much more common for
individual files (not whole directories) to be moved, it seemed cleaner to
delay appending the "/" until we know we have some directory moves to
actually consider.

I haven't benchmarked this, but I imagine this is a mild performance win.

Differential Revision: https://phab.mercurial-scm.org/D4284

#ifndef _HG_MPATCH_H_
#define _HG_MPATCH_H_

#define MPATCH_ERR_NO_MEM -3
#define MPATCH_ERR_CANNOT_BE_DECODED -2
#define MPATCH_ERR_INVALID_PATCH -1

struct mpatch_frag {
	int start, end, len;
	const char *data;
};

struct mpatch_flist {
	struct mpatch_frag *base, *head, *tail;
};

int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist **res);
ssize_t mpatch_calcsize(ssize_t len, struct mpatch_flist *l);
void mpatch_lfree(struct mpatch_flist *a);
int mpatch_apply(char *buf, const char *orig, ssize_t len,
                 struct mpatch_flist *l);
struct mpatch_flist *
mpatch_fold(void *bins, struct mpatch_flist *(*get_next_item)(void *, ssize_t),
            ssize_t start, ssize_t end);

#endif