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()