storageutil: move metadata parsing and packing from revlog (API)
Parsing and writing of revision text metadata is likely identical
across storage backends. Let's move the code out of revlog so we
don't need to import the revlog module in order to use it.
Differential Revision: https://phab.mercurial-scm.org/D4754
from __future__ import absolute_import
import cffi
import os
ffi = cffi.FFI()
with open(os.path.join(os.path.join(os.path.dirname(__file__), '..'),
'bdiff.c')) as f:
ffi.set_source("mercurial.cffi._bdiff",
f.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()