mercurial/mpatch.h

context: add specialized way of getting copy source file only

I'm working on support for storing copy metadata in the changeset
instead of the filelog. I don't intend to include the file nodeid
there, but most callers don't need that anyway. This patch introduces
a method similar to ctx.renamed(), but the new method returns only the
source filename, not the nodeid. Subsequent patches will move callers
over to this new method.

Differential Revision: https://phab.mercurial-scm.org/D6008

#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