x3x3x3x_5h3ll
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/lib64/python3.6/dbm/
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[ NAME ] [ SIZE ] [ PERM ] [ DATE ] [ ACTN ]
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__pycache__ dir drwxr-xr-x 2024-10-07 16:37 R D
  __init__.py 5.647 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  dumb.py 11.708 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  gnu.py 0.07 KB -rw-r--r-- 2018-12-23 21:37 R E G D
  ndbm.py 0.068 KB -rw-r--r-- 2018-12-23 21:37 R E G D
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"""A dumb and slow but simple dbm clone. For database spam, spam.dir contains the index (a text file), spam.bak *may* contain a backup of the index (also a text file), while spam.dat contains the data (a binary file). XXX TO DO: - seems to contain a bug when updating... - reclaim free space (currently, space once occupied by deleted or expanded items is never reused) - support concurrent access (currently, if two processes take turns making updates, they can mess up the index) - support efficient access to large databases (currently, the whole index is read when the database is opened, and some updates rewrite the whole index) - support opening for read-only (flag = 'm') """ import ast as _ast import io as _io import os as _os import collections __all__ = ["error", "open"] _BLOCKSIZE = 512 error = OSError class _Database(collections.MutableMapping): # The on-disk directory and data files can remain in mutually # inconsistent states for an arbitrarily long time (see comments # at the end of __setitem__). This is only repaired when _commit() # gets called. One place _commit() gets called is from __del__(), # and if that occurs at program shutdown time, module globals may # already have gotten rebound to None. Since it's crucial that # _commit() finish successfully, we can't ignore shutdown races # here, and _commit() must not reference any globals. _os = _os # for _commit() _io = _io # for _commit() def __init__(self, filebasename, mode, flag='c'): self._mode = mode self._readonly = (flag == 'r') # The directory file is a text file. Each line looks like # "%r, (%d, %d)\n" % (key, pos, siz) # where key is the string key, pos is the offset into the dat # file of the associated value's first byte, and siz is the number # of bytes in the associated value. self._dirfile = filebasename + '.dir' # The data file is a binary file pointed into by the directory # file, and holds the values associated with keys. Each value # begins at a _BLOCKSIZE-aligned byte offset, and is a raw # binary 8-bit string value. self._datfile = filebasename + '.dat' self._bakfile = filebasename + '.bak' # The index is an in-memory dict, mirroring the directory file. self._index = None # maps keys to (pos, siz) pairs # Handle the creation self._create(flag) self._update() def _create(self, flag): if flag == 'n': for filename in (self._datfile, self._bakfile, self._dirfile): try: _os.remove(filename) except OSError: pass # Mod by Jack: create data file if needed try: f = _io.open(self._datfile, 'r', encoding="Latin-1") except OSError: if flag not in ('c', 'n'): import warnings warnings.warn("The database file is missing, the " "semantics of the 'c' flag will be used.", DeprecationWarning, stacklevel=4) with _io.open(self._datfile, 'w', encoding="Latin-1") as f: self._chmod(self._datfile) else: f.close() # Read directory file into the in-memory index dict. def _update(self): self._index = {} try: f = _io.open(self._dirfile, 'r', encoding="Latin-1") except OSError: self._modified = not self._readonly else: self._modified = False with f: for line in f: line = line.rstrip() key, pos_and_siz_pair = _ast.literal_eval(line) key = key.encode('Latin-1') self._index[key] = pos_and_siz_pair # Write the index dict to the directory file. The original directory # file (if any) is renamed with a .bak extension first. If a .bak # file currently exists, it's deleted. def _commit(self): # CAUTION: It's vital that _commit() succeed, and _commit() can # be called from __del__(). Therefore we must never reference a # glo