mercurial/cffi/mpatchbuild.py

repair: extract a helper for generating all manifest revlogs

We'll need to walk the manifest revlogs also to figure out which
manifests have linkrevs out of order (for fixing the bug shown in the
previous patch).

By the way, perhaps it would be more efficient in many cases to find
only the relevant directory manifest revlogs based on the files
instead of walking the entire store, but that can be changed later.

Differential Revision: https://phab.mercurial-scm.org/D6794

from __future__ import absolute_import

import cffi
import os

ffi = cffi.FFI()
mpatch_c = os.path.join(os.path.join(os.path.dirname(__file__), '..',
                                     'mpatch.c'))
with open(mpatch_c) as f:
    ffi.set_source("mercurial.cffi._mpatch", f.read(),
                   include_dirs=["mercurial"])
ffi.cdef("""

struct mpatch_frag {
       int start, end, len;
       const char *data;
};

struct mpatch_flist {
       struct mpatch_frag *base, *head, *tail;
};

extern "Python" struct mpatch_flist* cffi_get_next_item(void*, ssize_t);

int mpatch_decode(const char *bin, ssize_t len, struct mpatch_flist** res);
ssize_t mpatch_calcsize(size_t len, struct mpatch_flist *l);
void mpatch_lfree(struct mpatch_flist *a);
static int mpatch_apply(char *buf, const char *orig, size_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);
""")

if __name__ == '__main__':
    ffi.compile()