parsers: use buffer to store revlog index Previously, the revlog index passed to parse_index2 must be a "string", which means we have to read the whole revlog index into memory. This patch makes the code accept a generic Py_buffer, to be more flexible - it could be a "string", or anything that implements the buffer interface, like a mmap-ed region. Note: ideally we want to remove the "data" field. However, it is still used in parse_index2: if (idx->inlined) { cache = Py_BuildValue("iO", 0, idx->data); .... } .... tuple = Py_BuildValue("NN", idx, cache); .... return tuple; Its only users are revlogio.parseindex and revlog.__init__: # revlogio.parseindex index, cache = parsers.parse_index2(data, inline) return index, getattr(index, 'nodemap', None), cache # revlog.__init__ d = self._io.parseindex(indexdata, self._inline) self.index, nodemap, self._chunkcache = d Maybe we could move the logic (testing inline and returnning "data" object) to revlog.py. But that should be a separate patch.