view mercurial/mpatch.h @ 32252:d67991c4fefe

treemanifest: allow manifestrevlog to take an explicit treemanifest arg

Previously we relied on the opener options to tell the revlog to be a tree
manifest. This makes it complicated for extensions to create treemanifests and
normal manifests at the same time. Let's add a construtor argument to create a
treemanifest revlog as well.

I considered removing the options['treemanifest'] logic from manifestrevlog
entirely, but doing so shifts the responsibility to the caller which ends up
requiring changes in localrepo, bundlerepo, and unionrepo. I figured having the
dual mechanism was better than polluting other parts of the code base with
treemanifest knowledge.

#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