/usr/lib/python2.7/dist-packages/fs/zipfs.py is in python-fs 0.5.4-1.
This file is owned by root:root, with mode 0o644.
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fs.zipfs
========
A FS object that represents the contents of a Zip file
"""
import datetime
import os.path
from fs.base import *
from fs.path import *
from fs.errors import *
from fs.filelike import StringIO
from fs import iotools
from zipfile import ZipFile, ZIP_DEFLATED, ZIP_STORED, BadZipfile, LargeZipFile
from memoryfs import MemoryFS
import tempfs
from six import PY3
class ZipOpenError(CreateFailedError):
"""Thrown when the zip file could not be opened"""
pass
class ZipNotFoundError(CreateFailedError):
"""Thrown when the requested zip file does not exist"""
pass
class _TempWriteFile(object):
"""Proxies a file object and calls a callback when the file is closed."""
def __init__(self, fs, filename, close_callback):
self.fs = fs
self.filename = filename
self._file = self.fs.open(filename, 'wb+')
self.close_callback = close_callback
def write(self, data):
return self._file.write(data)
def tell(self):
return self._file.tell()
def close(self):
self._file.close()
self.close_callback(self.filename)
def flush(self):
self._file.flush()
def seek(self, offset, whence):
return self._file.seek(offset, whence)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
self.close()
class _ExceptionProxy(object):
"""A placeholder for an object that may no longer be used."""
def __getattr__(self, name):
raise ValueError("Zip file has been closed")
def __setattr__(self, name, value):
raise ValueError("Zip file has been closed")
def __nonzero__(self):
return False
class ZipFS(FS):
"""A FileSystem that represents a zip file."""
_meta = {'thread_safe': True,
'virtual': False,
'read_only': False,
'unicode_paths': True,
'case_insensitive_paths': False,
'network': False,
'atomic.setcontents': False
}
def __init__(self, zip_file, mode="r", compression="deflated", allow_zip_64=False, encoding="CP437", thread_synchronize=True):
"""Create a FS that maps on to a zip file.
:param zip_file: a (system) path, or a file-like object
:param mode: mode to open zip file, 'r' for reading, 'w' for writing or 'a' for appending
:param compression: can be 'deflated' (default) to compress data or 'stored' to just store date
:param allow_zip_64: set to True to use zip files greater than 2 GB, default is False
:param encoding: the encoding to use for unicode filenames
:param thread_synchronize: set to True (default) to enable thread-safety
:raises `fs.errors.ZipOpenError`: thrown if the zip file could not be opened
:raises `fs.errors.ZipNotFoundError`: thrown if the zip file does not exist (derived from ZipOpenError)
"""
super(ZipFS, self).__init__(thread_synchronize=thread_synchronize)
if compression == "deflated":
compression_type = ZIP_DEFLATED
elif compression == "stored":
compression_type = ZIP_STORED
else:
raise ValueError("Compression should be 'deflated' (default) or 'stored'")
if len(mode) > 1 or mode not in "rwa":
raise ValueError("mode must be 'r', 'w' or 'a'")
self.zip_mode = mode
self.encoding = encoding
if isinstance(zip_file, basestring):
zip_file = os.path.expanduser(os.path.expandvars(zip_file))
zip_file = os.path.normpath(os.path.abspath(zip_file))
self._zip_file_string = True
else:
self._zip_file_string = False
try:
self.zf = ZipFile(zip_file, mode, compression_type, allow_zip_64)
except BadZipfile, bzf:
raise ZipOpenError("Not a zip file or corrupt (%s)" % str(zip_file),
details=bzf)
except IOError, ioe:
if str(ioe).startswith('[Errno 22] Invalid argument'):
raise ZipOpenError("Not a zip file or corrupt (%s)" % str(zip_file),
details=ioe)
raise ZipNotFoundError("Zip file not found (%s)" % str(zip_file),
details=ioe)
self.zip_path = str(zip_file)
self.temp_fs = None
if mode in 'wa':
self.temp_fs = tempfs.TempFS()
self._path_fs = MemoryFS()
if mode in 'ra':
self._parse_resource_list()
self.read_only = mode == 'r'
def __str__(self):
return "<ZipFS: %s>" % self.zip_path
def __unicode__(self):
return u"<ZipFS: %s>" % self.zip_path
def _decode_path(self, path):
if PY3:
return path
return path.decode(self.encoding)
def _encode_path(self, path):
if PY3:
return path
return path.encode(self.encoding)
def _parse_resource_list(self):
for path in self.zf.namelist():
#self._add_resource(path.decode(self.encoding))
self._add_resource(self._decode_path(path))
def _add_resource(self, path):
if path.endswith('/'):
path = path[:-1]
if path:
self._path_fs.makedir(path, recursive=True, allow_recreate=True)
else:
dirpath, _filename = pathsplit(path)
if dirpath:
self._path_fs.makedir(dirpath, recursive=True, allow_recreate=True)
f = self._path_fs.open(path, 'w')
f.close()
def getmeta(self, meta_name, default=NoDefaultMeta):
if meta_name == 'read_only':
return self.read_only
return super(ZipFS, self).getmeta(meta_name, default)
def close(self):
"""Finalizes the zip file so that it can be read.
No further operations will work after this method is called."""
if hasattr(self, 'zf') and self.zf:
self.zf.close()
self.zf = _ExceptionProxy()
@synchronize
@iotools.filelike_to_stream
def open(self, path, mode='r', buffering=-1, encoding=None, errors=None, newline=None, line_buffering=False, **kwargs):
path = normpath(relpath(path))
if 'r' in mode:
if self.zip_mode not in 'ra':
raise OperationFailedError("open file",
path=path,
msg="1 Zip file must be opened for reading ('r') or appending ('a')")
try:
if hasattr(self.zf, 'open') and self._zip_file_string:
#return self.zf.open(self._encode_path(path), "r")
return self.zf.open(self._encode_path(path), 'rU' if 'U' in mode else 'r')
else:
contents = self.zf.read(self._encode_path(path))
except KeyError:
raise ResourceNotFoundError(path)
return StringIO(contents)
if 'w' in mode:
if self.zip_mode not in 'wa':
raise OperationFailedError("open file",
path=path,
msg="2 Zip file must be opened for writing ('w') or appending ('a')")
dirname, _filename = pathsplit(path)
if dirname:
self.temp_fs.makedir(dirname, recursive=True, allow_recreate=True)
self._add_resource(path)
f = _TempWriteFile(self.temp_fs, path, self._on_write_close)
return f
raise ValueError("Mode must contain be 'r' or 'w'")
@synchronize
def getcontents(self, path, mode="rb", encoding=None, errors=None, newline=None):
if not self.exists(path):
raise ResourceNotFoundError(path)
path = normpath(relpath(path))
try:
contents = self.zf.read(self._encode_path(path))
except KeyError:
raise ResourceNotFoundError(path)
except RuntimeError:
raise OperationFailedError("read file", path=path, msg="3 Zip file must be opened with 'r' or 'a' to read")
if 'b' in mode:
return contents
return iotools.decode_binary(contents, encoding=encoding, errors=errors, newline=newline)
@synchronize
def _on_write_close(self, filename):
sys_path = self.temp_fs.getsyspath(filename)
self.zf.write(sys_path, self._encode_path(filename))
def desc(self, path):
return "%s in zip file %s" % (path, self.zip_path)
def isdir(self, path):
return self._path_fs.isdir(path)
def isfile(self, path):
return self._path_fs.isfile(path)
def exists(self, path):
return self._path_fs.exists(path)
@synchronize
def makedir(self, dirname, recursive=False, allow_recreate=False):
dirname = normpath(dirname)
if self.zip_mode not in "wa":
raise OperationFailedError("create directory", path=dirname, msg="4 Zip file must be opened for writing ('w') or appending ('a')")
if not dirname.endswith('/'):
dirname += '/'
self._add_resource(dirname)
def listdir(self, path="/", wildcard=None, full=False, absolute=False, dirs_only=False, files_only=False):
return self._path_fs.listdir(path, wildcard, full, absolute, dirs_only, files_only)
@synchronize
def getinfo(self, path):
if not self.exists(path):
raise ResourceNotFoundError(path)
path = normpath(path).lstrip('/')
try:
zi = self.zf.getinfo(self._encode_path(path))
zinfo = dict((attrib, getattr(zi, attrib)) for attrib in dir(zi) if not attrib.startswith('_'))
for k, v in zinfo.iteritems():
if callable(v):
zinfo[k] = v()
except KeyError:
zinfo = {'file_size': 0}
info = {'size': zinfo['file_size']}
if 'date_time' in zinfo:
info['modified_time'] = info['created_time'] = datetime.datetime(*zinfo['date_time'])
info.update(zinfo)
if 'FileHeader' in info:
del info['FileHeader']
return info
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