view mercurial/mpatch.h @ 39244:73cf21b2e8a6

manifest: add getstorage() to manifestlog and use it globally

It is a common pattern to obtain a directory manifest storage instance
(a manifestrevlog) by going through manifestlog._revlog.dirlog().

Why access to storage and caching of other manifests is done through
manifestrevlog instead of manifestlog, I don't know.

This commit establishes a getstorage(tree) API on manifestlog and
imanifestlog that provides a public API for accessing manifest storage.

All consumers previously using private attributes have been updated
to use this new method.

.. api:: manifestlog now has a getstorage(tree) method

   It should be used for obtaining an object representing the
   manifest's storage implementation. Accessing
   manifestlog._revlog should be avoided.

Differential Revision: https://phab.mercurial-scm.org/D4277

#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