view mercurial/mpatch.h @ 46495:5aac1a1a5beb

tagcache: distinguish between invalid and missing entries

The TortoiseHg repo has typically not had a newly applied tag accessible by name
for recent releases, for unknown reasons.  Deleting and rebuilding the tag cache
doesn't fix it, though deleting the cache and running `hg log -r $new_tag` does.
Eventually the situation does sort itself out for new clones from the server.
In an effort to figure out what the issue is, Pierre-Yves David suggested
listing these entries in the debug output more specifically.

This isn't complete yet- the second test change that says "missing" is more like
"invalid", since it was truncated.  The problem there is the code that reads the
raw array truncates any partial records and then fills it with 0xFF, which
signifies that it is missing.  As a side note, that means the check for the
length when validating an existing entry never fails.

Differential Revision: https://phab.mercurial-scm.org/D9811

#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