view mercurial/mpatch.h @ 51249:2966b88d4531

rust-revlog: bare minimal NodeTree exposition

The independent `NodeTree` instances needs to be associated to an
index (for forward-checks of candidates) but do not need to
encompass all revisions from that index.

This is exactly how it is used in `scmutil.shortesthenodeidprefix`
and we restrict the implementation to the bare minimum needed there
and to write convincing tests.
It would of course be fairly trivial to add more.

#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