def store(self, istream):
zstream = ZippedStoreShaWriter()
self._db.set_ostream(zstream)
istream = self._db.store(istream)
zstream.close() # close to flush
zstream.seek(0)
# don't provide a size, the stream is written in object format, hence the
# header needs decompression
decomp_stream = DecompressMemMapReader(zstream.getvalue(), close_on_deletion=False)
self._cache[istream.binsha] = OStream(istream.binsha, istream.type, istream.size, decomp_stream)
return istream
def _object(self, sha, as_stream, index=-1):
""":return: OInfo or OStream object providing information about the given sha
:param index: if not -1, its assumed to be the sha's index in the IndexFile"""
# its a little bit redundant here, but it needs to be efficient
if index < 0:
index = self._sha_to_index(sha)
if sha is None:
sha = self._index.sha(index)
# END assure sha is present ( in output )
offset = self._index.offset(index)
type_id, uncomp_size, data_rela_offset = pack_object_header_info(
self._pack._cursor.use_region(offset).buffer())
if as_stream:
if type_id not in delta_types:
packstream = self._pack.stream(offset)
return OStream(sha, packstream.type, packstream.size,
packstream.stream)
# END handle non-deltas
# produce a delta stream containing all info
# To prevent it from applying the deltas when querying the size,
# we extract it from the delta stream ourselves
streams = self.collect_streams_at_offset(offset)
dstream = DeltaApplyReader.new(streams)
return ODeltaStream(sha, dstream.type, None, dstream)
else:
if type_id not in delta_types:
return OInfo(sha, type_id_to_type_map[type_id], uncomp_size)
# END handle non-deltas
# deltas are a little tougher - unpack the first bytes to obtain
# the actual target size, as opposed to the size of the delta data
streams = self.collect_streams_at_offset(offset)
buf = streams[0].read(512)
offset, src_size = msb_size(buf)
offset, target_size = msb_size(buf, offset)
# collect the streams to obtain the actual object type
if streams[-1].type_id in delta_types:
raise BadObject(sha, "Could not resolve delta object")
return OInfo(sha, streams[-1].type, target_size)
def stream(self, sha):
m = self._map_loose_object(sha)
type, size, stream = DecompressMemMapReader.new(m,
close_on_deletion=True)
return OStream(sha, type, size, stream)
def stream(self, binsha: bytes) -> OStream:
"""For now, all lookup is done by git itself"""
hexsha, typename, size, stream = self._git.stream_object_data(bin_to_hex(binsha))
return OStream(hex_to_bin(hexsha), typename, size, stream)