view mercurial/mpatch.h @ 34339:b36881c68569

dirstate: create new dirstatemap class

This is part of a larger refactor to move the dirstate storage logic to a
separate class, so it's easier to rewrite the dirstate storage layer without
having to rewrite all the algorithms as well.

Step one it to create the class, and replace dirstate._map with it.  The
abstraction bleeds through in a few places where the main dirstate class has to
access self._map._map, but those will be cleaned up in future patches.

Differential Revision: https://phab.mercurial-scm.org/D752

#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