setup_bdiff_cffi.py

manifest: convert PyString* to PyBytes*

Python 2.6 introduced PyBytesObject and PyBytes* as aliases for
PyStringObject and PyString*. So on Python 2.6+, PyBytes* and PyString*
are identical and this patch should be a no-op.

On Python 3, PyStringObject is effectively renamed to PyUnicodeObject
and PyBytesObject becomes the main type for byte strings.

This patch begins the process of mass converting PyString* to PyBytes*
so the C extensions use the correct type on Python 3.

from __future__ import absolute_import

import cffi
import os

ffi = cffi.FFI()
ffi.set_source("_bdiff_cffi",
    open(os.path.join(os.path.join(os.path.dirname(__file__), 'mercurial'),
        'bdiff.c')).read(), include_dirs=['mercurial'])
ffi.cdef("""
struct bdiff_line {
    int hash, n, e;
    ssize_t len;
    const char *l;
};

struct bdiff_hunk;
struct bdiff_hunk {
    int a1, a2, b1, b2;
    struct bdiff_hunk *next;
};

int bdiff_splitlines(const char *a, ssize_t len, struct bdiff_line **lr);
int bdiff_diff(struct bdiff_line *a, int an, struct bdiff_line *b, int bn,
    struct bdiff_hunk *base);
void bdiff_freehunks(struct bdiff_hunk *l);
void free(void*);
""")

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