def _set_cache_(self, attr):
if attr == "_packfile_checksum":
self._packfile_checksum = self._cursor.map()[-40:-20]
elif attr == "_packfile_checksum":
self._packfile_checksum = self._cursor.map()[-20:]
elif attr == "_cursor":
# Note: We don't lock the file when reading as we cannot be sure
# that we can actually write to the location - it could be a read-only
# alternate for instance
self._cursor = mman.make_cursor(self._indexpath).use_region()
# We will assume that the index will always fully fit into memory !
if mman.window_size() > 0 and self._cursor.file_size(
) > mman.window_size():
raise AssertionError(
"The index file at %s is too large to fit into a mapped window (%i > %i). This is a limitation of the implementation"
% (self._indexpath, self._cursor.file_size(),
mman.window_size()))
# END assert window size
else:
# now its time to initialize everything - if we are here, someone wants
# to access the fanout table or related properties
# CHECK VERSION
mmap = self._cursor.map()
self._version = (mmap[:4] == self.index_v2_signature and 2) or 1
if self._version == 2:
version_id = unpack_from(">L", mmap, 4)[0]
assert version_id == self._version, "Unsupported index version: %i" % version_id
# END assert version
# SETUP FUNCTIONS
# setup our functions according to the actual version
for fname in ('entry', 'offset', 'sha', 'crc'):
setattr(self, fname,
getattr(self, "_%s_v%i" % (fname, self._version)))
# END for each function to initialize
# INITIALIZE DATA
# byte offset is 8 if version is 2, 0 otherwise
self._initialize()
def _set_cache_(self, attr):
if attr == "_packfile_checksum":
self._packfile_checksum = self._cursor.map()[-40:-20]
elif attr == "_packfile_checksum":
self._packfile_checksum = self._cursor.map()[-20:]
elif attr == "_cursor":
# Note: We don't lock the file when reading as we cannot be sure
# that we can actually write to the location - it could be a read-only
# alternate for instance
self._cursor = mman.make_cursor(self._indexpath).use_region()
# We will assume that the index will always fully fit into memory !
if mman.window_size() > 0 and self._cursor.file_size() > mman.window_size():
raise AssertionError(
"The index file at %s is too large to fit into a mapped window (%i > %i). This is a limitation of the implementation"
% (self._indexpath, self._cursor.file_size(), mman.window_size())
)
# END assert window size
else:
# now its time to initialize everything - if we are here, someone wants
# to access the fanout table or related properties
# CHECK VERSION
mmap = self._cursor.map()
self._version = (mmap[:4] == self.index_v2_signature and 2) or 1
if self._version == 2:
version_id = unpack_from(">L", mmap, 4)[0]
assert version_id == self._version, "Unsupported index version: %i" % version_id
# END assert version
# SETUP FUNCTIONS
# setup our functions according to the actual version
for fname in ("entry", "offset", "sha", "crc"):
setattr(self, fname, getattr(self, "_%s_v%i" % (fname, self._version)))
# END for each function to initialize
# INITIALIZE DATA
# byte offset is 8 if version is 2, 0 otherwise
self._initialize()