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Edit File : zipfile.py \| Size : 58.08 KB
""" Read and write ZIP files. """ import struct, os, time, sys, shutil import binascii, cStringIO, stat import io import re import string try: import zlib # We may need its compression method crc32 = zlib.crc32 except ImportError: zlib = None crc32 = binascii.crc32 __all__ = ["BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "is_zipfile", "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile" ] class BadZipfile(Exception): pass class LargeZipFile(Exception): """ Raised when writing a zipfile, the zipfile requires ZIP64 extensions and those extensions are disabled. """ error = BadZipfile # The exception raised by this module ZIP64_LIMIT = (1 << 31) - 1 ZIP_FILECOUNT_LIMIT = (1 << 16) - 1 ZIP_MAX_COMMENT = (1 << 16) - 1 # constants for Zip file compression methods ZIP_STORED = 0 ZIP_DEFLATED = 8 # Other ZIP compression methods not supported # Below are some formats and associated data for reading/writing headers using # the struct module. The names and structures of headers/records are those used # in the PKWARE description of the ZIP file format: # http://www.pkware.com/documents/casestudies/APPNOTE.TXT # (URL valid as of January 2008) # The "end of central directory" structure, magic number, size, and indices # (section V.I in the format document) structEndArchive = "<4s4H2LH" stringEndArchive = "PK\005\006" sizeEndCentDir = struct.calcsize(structEndArchive) _ECD_SIGNATURE = 0 _ECD_DISK_NUMBER = 1 _ECD_DISK_START = 2 _ECD_ENTRIES_THIS_DISK = 3 _ECD_ENTRIES_TOTAL = 4 _ECD_SIZE = 5 _ECD_OFFSET = 6 _ECD_COMMENT_SIZE = 7 # These last two indices are not part of the structure as defined in the # spec, but they are used internally by this module as a convenience _ECD_COMMENT = 8 _ECD_LOCATION = 9 # The "central directory" structure, magic number, size, and indices # of entries in the structure (section V.F in the format document) structCentralDir = "<4s4B4HL2L5H2L" stringCentralDir = "PK\001\002" sizeCentralDir = struct.calcsize(structCentralDir) # indexes of entries in the central directory structure _CD_SIGNATURE = 0 _CD_CREATE_VERSION = 1 _CD_CREATE_SYSTEM = 2 _CD_EXTRACT_VERSION = 3 _CD_EXTRACT_SYSTEM = 4 _CD_FLAG_BITS = 5 _CD_COMPRESS_TYPE = 6 _CD_TIME = 7 _CD_DATE = 8 _CD_CRC = 9 _CD_COMPRESSED_SIZE = 10 _CD_UNCOMPRESSED_SIZE = 11 _CD_FILENAME_LENGTH = 12 _CD_EXTRA_FIELD_LENGTH = 13 _CD_COMMENT_LENGTH = 14 _CD_DISK_NUMBER_START = 15 _CD_INTERNAL_FILE_ATTRIBUTES = 16 _CD_EXTERNAL_FILE_ATTRIBUTES = 17 _CD_LOCAL_HEADER_OFFSET = 18 # The "local file header" structure, magic number, size, and indices # (section V.A in the format document) structFileHeader = "<4s2B4HL2L2H" stringFileHeader = "PK\003\004" sizeFileHeader = struct.calcsize(structFileHeader) _FH_SIGNATURE = 0 _FH_EXTRACT_VERSION = 1 _FH_EXTRACT_SYSTEM = 2 _FH_GENERAL_PURPOSE_FLAG_BITS = 3 _FH_COMPRESSION_METHOD = 4 _FH_LAST_MOD_TIME = 5 _FH_LAST_MOD_DATE = 6 _FH_CRC = 7 _FH_COMPRESSED_SIZE = 8 _FH_UNCOMPRESSED_SIZE = 9 _FH_FILENAME_LENGTH = 10 _FH_EXTRA_FIELD_LENGTH = 11 # The "Zip64 end of central directory locator" structure, magic number, and size structEndArchive64Locator = "<4sLQL" stringEndArchive64Locator = "PK\x06\x07" sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator) # The "Zip64 end of central directory" record, magic number, size, and indices # (section V.G in the format document) structEndArchive64 = "<4sQ2H2L4Q" stringEndArchive64 = "PK\x06\x06" sizeEndCentDir64 = struct.calcsize(structEndArchive64) _CD64_SIGNATURE = 0 _CD64_DIRECTORY_RECSIZE = 1 _CD64_CREATE_VERSION = 2 _CD64_EXTRACT_VERSION = 3 _CD64_DISK_NUMBER = 4 _CD64_DISK_NUMBER_START = 5 _CD64_NUMBER_ENTRIES_THIS_DISK = 6 _CD64_NUMBER_ENTRIES_TOTAL = 7 _CD64_DIRECTORY_SIZE = 8 _CD64_OFFSET_START_CENTDIR = 9 _DD_SIGNATURE = 0x08074b50 _EXTRA_FIELD_STRUCT = struct.Struct('<HH') def _strip_extra(extra, xids): # Remove Extra Fields with specified IDs. unpack = _EXTRA_FIELD_STRUCT.unpack modified = False buffer = [] start = i = 0 while i + 4 <= len(extra): xid, xlen = unpack(extra[i : i + 4]) j = i + 4 + xlen if xid in xids: if i != start: buffer.append(extra[start : i]) start = j modified = True i = j if not modified: return extra return b''.join(buffer) def _check_zipfile(fp): try: if _EndRecData(fp): return True # file has correct magic number except IOError: pass return False def is_zipfile(filename): """Quickly see if a file is a ZIP file by checking the magic number. The filename argument may be a file or file-like object too. """ result = False try: if hasattr(filename, "read"): result = _check_zipfile(fp=filename) else: with open(filename, "rb") as fp: result = _check_zipfile(fp) except IOError: pass return result def _EndRecData64(fpin, offset, endrec): """ Read the ZIP64 end-of-archive records and use that to update endrec """ try: fpin.seek(offset - sizeEndCentDir64Locator, 2) except IOError: # If the seek fails, the file is not large enough to contain a ZIP64 # end-of-archive record, so just return the end record we were given. return endrec data = fpin.read(sizeEndCentDir64Locator) if len(data) != sizeEndCentDir64Locator: return endrec sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data) if sig != stringEndArchive64Locator: return endrec if diskno != 0 or disks != 1: raise BadZipfile("zipfiles that span multiple disks are not supported") # Assume no 'zip64 extensible data' fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2) data = fpin.read(sizeEndCentDir64) if len(data) != sizeEndCentDir64: return endrec sig, sz, create_version, read_version, disk_num, disk_dir, \ dircount, dircount2, dirsize, diroffset = \ struct.unpack(structEndArchive64, data) if sig != stringEndArchive64: return endrec # Update the original endrec using data from the ZIP64 record endrec[_ECD_SIGNATURE] = sig endrec[_ECD_DISK_NUMBER] = disk_num endrec[_ECD_DISK_START] = disk_dir endrec[_ECD_ENTRIES_THIS_DISK] = dircount endrec[_ECD_ENTRIES_TOTAL] = dircount2 endrec[_ECD_SIZE] = dirsize endrec[_ECD_OFFSET] = diroffset return endrec def _EndRecData(fpin): """Return data from the "End of Central Directory" record, or None. The data is a list of the nine items in the ZIP "End of central dir" record followed by a tenth item, the file seek offset of this record.""" # Determine file size fpin.seek(0, 2) filesize = fpin.tell() # Check to see if this is ZIP file with no archive comment (the # "end of central directory" structure should be the last item in the # file if this is the case). try: fpin.seek(-sizeEndCentDir, 2) except IOError: return None data = fpin.read() if (len(data) == sizeEndCentDir and data[0:4] == stringEndArchive and data[-2:] == b"\000\000"): # the signature is correct and there's no comment, unpack structure endrec = struct.unpack(structEndArchive, data) endrec=list(endrec) # Append a blank comment and record start offset endrec.append("") endrec.append(filesize - sizeEndCentDir) # Try to read the "Zip64 end of central directory" structure return _EndRecData64(fpin, -sizeEndCentDir, endrec) # Either this is not a ZIP file, or it is a ZIP file with an archive # comment. Search the end of the file for the "end of central directory" # record signature. The comment is the last item in the ZIP file and may be # up to 64K long. It is assumed that the "end of central directory" magic # number does not appear in the comment. maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0) fpin.seek(maxCommentStart, 0) data = fpin.read() start = data.rfind(stringEndArchive) if start >= 0: # found the magic number; attempt to unpack and interpret recData = data[start:start+sizeEndCentDir] if len(recData) != sizeEndCentDir: # Zip file is corrupted. return None endrec = list(struct.unpack(structEndArchive, recData)) commentSize = endrec[_ECD_COMMENT_SIZE] #as claimed by the zip file comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize] endrec.append(comment) endrec.append(maxCommentStart + start) # Try to read the "Zip64 end of central directory" structure return _EndRecData64(fpin, maxCommentStart + start - filesize, endrec) # Unable to find a valid end of central directory structure return None class ZipInfo (object): """Class with attributes describing each file in the ZIP archive.""" __slots__ = ( 'orig_filename', 'filename', 'date_time', 'compress_type', 'comment', 'extra', 'create_system', 'create_version', 'extract_version', 'reserved', 'flag_bits', 'volume', 'internal_attr', 'external_attr', 'header_offset', 'CRC', 'compress_size', 'file_size', '_raw_time', ) def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)): self.orig_filename = filename # Original file name in archive # Terminate the file name at the first null byte. Null bytes in file # names are used as tricks by viruses in archives. null_byte = filename.find(chr(0)) if null_byte >= 0: filename = filename[0:null_byte] # This is used to ensure paths in generated ZIP files always use # forward slashes as the directory separator, as required by the # ZIP format specification. if os.sep != "/" and os.sep in filename: filename = filename.replace(os.sep, "/") self.filename = filename # Normalized file name self.date_time = date_time # year, month, day, hour, min, sec if date_time[0] < 1980: raise ValueError('ZIP does not support timestamps before 1980') # Standard values: self.compress_type = ZIP_STORED # Type of compression for the file self.comment = "" # Comment for each file self.extra = "" # ZIP extra data if sys.platform == 'win32': self.create_system = 0 # System which created ZIP archive else: # Assume everything else is unix-y self.create_system = 3 # System which created ZIP archive self.create_version = 20 # Version which created ZIP archive self.extract_version = 20 # Version needed to extract archive self.reserved = 0 # Must be zero self.flag_bits = 0 # ZIP flag bits self.volume = 0 # Volume number of file header self.internal_attr = 0 # Internal attributes self.external_attr = 0 # External file attributes # Other attributes are set by class ZipFile: # header_offset Byte offset to the file header # CRC CRC-32 of the uncompressed file # compress_size Size of the compressed file # file_size Size of the uncompressed file def FileHeader(self, zip64=None): """Return the per-file header as a string.""" dt = self.date_time dosdate = (dt[0] - 1980) << 9 \| dt[1] << 5 \| dt[2] dostime = dt[3] << 11 \| dt[4] << 5 \| (dt[5] // 2) if self.flag_bits & 0x08: # Set these to zero because we write them after the file data CRC = compress_size = file_size = 0 else: CRC = self.CRC compress_size = self.compress_size file_size = self.file_size extra = self.extra if zip64 is None: zip64 = file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT if zip64: fmt = '<HHQQ' extra = extra + struct.pack(fmt, 1, struct.calcsize(fmt)-4, file_size, compress_size) if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT: if not zip64: raise LargeZipFile("Filesize would require ZIP64 extensions") # File is larger than what fits into a 4 byte integer, # fall back to the ZIP64 extension file_size = 0xffffffff compress_size = 0xffffffff self.extract_version = max(45, self.extract_version) self.create_version = max(45, self.extract_version) filename, flag_bits = self._encodeFilenameFlags() header = struct.pack(structFileHeader, stringFileHeader, self.extract_version, self.reserved, flag_bits, self.compress_type, dostime, dosdate, CRC, compress_size, file_size, len(filename), len(extra)) return header + filename + extra def _encodeFilenameFlags(self): if isinstance(self.filename, unicode): try: return self.filename.encode('ascii'), self.flag_bits except UnicodeEncodeError: return self.filename.encode('utf-8'), self.flag_bits \| 0x800 else: return self.filename, self.flag_bits def _decodeFilename(self): if self.flag_bits & 0x800: return self.filename.decode('utf-8') else: return self.filename def _decodeExtra(self): # Try to decode the extra field. extra = self.extra unpack = struct.unpack while len(extra) >= 4: tp, ln = unpack('<HH', extra[:4]) if tp == 1: if ln >= 24: counts = unpack('<QQQ', extra[4:28]) elif ln == 16: counts = unpack('<QQ', extra[4:20]) elif ln == 8: counts = unpack('<Q', extra[4:12]) elif ln == 0: counts = () else: raise RuntimeError, "Corrupt extra field %s"%(ln,) idx = 0 # ZIP64 extension (large files and/or large archives) if self.file_size in (0xffffffffffffffffL, 0xffffffffL): self.file_size = counts[idx] idx += 1 if self.compress_size == 0xFFFFFFFFL: self.compress_size = counts[idx] idx += 1 if self.header_offset == 0xffffffffL: old = self.header_offset self.header_offset = counts[idx] idx+=1 extra = extra[ln+4:] class _ZipDecrypter: """Class to handle decryption of files stored within a ZIP archive. ZIP supports a password-based form of encryption. Even though known plaintext attacks have been found against it, it is still useful to be able to get data out of such a file. Usage: zd = _ZipDecrypter(mypwd) plain_char = zd(cypher_char) plain_text = map(zd, cypher_text) """ def _GenerateCRCTable(): """Generate a CRC-32 table. ZIP encryption uses the CRC32 one-byte primitive for scrambling some internal keys. We noticed that a direct implementation is faster than relying on binascii.crc32(). """ poly = 0xedb88320 table = [0] * 256 for i in range(256): crc = i for j in range(8): if crc & 1: crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly else: crc = ((crc >> 1) & 0x7FFFFFFF) table[i] = crc return table crctable = _GenerateCRCTable() def _crc32(self, ch, crc): """Compute the CRC32 primitive on one byte.""" return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ord(ch)) & 0xff] def __init__(self, pwd): self.key0 = 305419896 self.key1 = 591751049 self.key2 = 878082192 for p in pwd: self._UpdateKeys(p) def _UpdateKeys(self, c): self.key0 = self._crc32(c, self.key0) self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295 self.key1 = (self.key1 * 134775813 + 1) & 4294967295 self.key2 = self._crc32(chr((self.key1 >> 24) & 255), self.key2) def __call__(self, c): """Decrypt a single character.""" c = ord(c) k = self.key2 \| 2 c = c ^ (((k * (k^1)) >> 8) & 255) c = chr(c) self._UpdateKeys(c) return c compressor_names = { 0: 'store', 1: 'shrink', 2: 'reduce', 3: 'reduce', 4: 'reduce', 5: 'reduce', 6: 'implode', 7: 'tokenize', 8: 'deflate', 9: 'deflate64', 10: 'implode', 12: 'bzip2', 14: 'lzma', 18: 'terse', 19: 'lz77', 97: 'wavpack', 98: 'ppmd', } class ZipExtFile(io.BufferedIOBase): """File-like object for reading an archive member. Is returned by ZipFile.open(). """ # Max size supported by decompressor. MAX_N = 1 << 31 - 1 # Read from compressed files in 4k blocks. MIN_READ_SIZE = 4096 # Search for universal newlines or line chunks. PATTERN = re.compile(r'^(?P<chunk>[^\r\n]+)\|(?P<newline>\n\|\r\n?)') def __init__(self, fileobj, mode, zipinfo, decrypter=None, close_fileobj=False): self._fileobj = fileobj self._decrypter = decrypter self._close_fileobj = close_fileobj self._compress_type = zipinfo.compress_type self._compress_size = zipinfo.compress_size self._compress_left = zipinfo.compress_size if self._compress_type == ZIP_DEFLATED: self._decompressor = zlib.decompressobj(-15) elif self._compress_type != ZIP_STORED: descr = compressor_names.get(self._compress_type) if descr: raise NotImplementedError("compression type %d (%s)" % (self._compress_type, descr)) else: raise NotImplementedError("compression type %d" % (self._compress_type,)) self._unconsumed = '' self._readbuffer = '' self._offset = 0 self._universal = 'U' in mode self.newlines = None # Adjust read size for encrypted files since the first 12 bytes # are for the encryption/password information. if self._decrypter is not None: self._compress_left -= 12 self.mode = mode self.name = zipinfo.filename if hasattr(zipinfo, 'CRC'): self._expected_crc = zipinfo.CRC self._running_crc = crc32(b'') & 0xffffffff else: self._expected_crc = None def readline(self, limit=-1): """Read and return a line from the stream. If limit is specified, at most limit bytes will be read. """ if not self._universal and limit < 0: # Shortcut common case - newline found in buffer. i = self._readbuffer.find('\n', self._offset) + 1 if i > 0: line = self._readbuffer[self._offset: i] self._offset = i return line if not self._universal: return io.BufferedIOBase.readline(self, limit) line = '' while limit < 0 or len(line) < limit: readahead = self.peek(2) if readahead == '': return line # # Search for universal newlines or line chunks. # # The pattern returns either a line chunk or a newline, but not # both. Combined with peek(2), we are assured that the sequence # '\r\n' is always retrieved completely and never split into # separate newlines - '\r', '\n' due to coincidental readaheads. # match = self.PATTERN.search(readahead) newline = match.group('newline') if newline is not None: if self.newlines is None: self.newlines = [] if newline not in self.newlines: self.newlines.append(newline) self._offset += len(newline) return line + '\n' chunk = match.group('chunk') if limit >= 0: chunk = chunk[: limit - len(line)] self._offset += len(chunk) line += chunk return line def peek(self, n=1): """Returns buffered bytes without advancing the position.""" if n > len(self._readbuffer) - self._offset: chunk = self.read(n) if len(chunk) > self._offset: self._readbuffer = chunk + self._readbuffer[self._offset:] self._offset = 0 else: self._offset -= len(chunk) # Return up to 512 bytes to reduce allocation overhead for tight loops. return self._readbuffer[self._offset: self._offset + 512] def readable(self): return True def read(self, n=-1): """Read and return up to n bytes. If the argument is omitted, None, or negative, data is read and returned until EOF is reached.. """ buf = '' if n is None: n = -1 while True: if n < 0: data = self.read1(n) elif n > len(buf): data = self.read1(n - len(buf)) else: return buf if len(data) == 0: return buf buf += data def _update_crc(self, newdata, eof): # Update the CRC using the given data. if self._expected_crc is None: # No need to compute the CRC if we don't have a reference value return self._running_crc = crc32(newdata, self._running_crc) & 0xffffffff # Check the CRC if we're at the end of the file if eof and self._running_crc != self._expected_crc: raise BadZipfile("Bad CRC-32 for file %r" % self.name) def read1(self, n): """Read up to n bytes with at most one read() system call.""" # Simplify algorithm (branching) by transforming negative n to large n. if n < 0 or n is None: n = self.MAX_N # Bytes available in read buffer. len_readbuffer = len(self._readbuffer) - self._offset # Read from file. if self._compress_left > 0 and n > len_readbuffer + len(self._unconsumed): nbytes = n - len_readbuffer - len(self._unconsumed) nbytes = max(nbytes, self.MIN_READ_SIZE) nbytes = min(nbytes, self._compress_left) data = self._fileobj.read(nbytes) self._compress_left -= len(data) if data and self._decrypter is not None: data = ''.join(map(self._decrypter, data)) if self._compress_type == ZIP_STORED: self._update_crc(data, eof=(self._compress_left==0)) self._readbuffer = self._readbuffer[self._offset:] + data self._offset = 0 else: # Prepare deflated bytes for decompression. self._unconsumed += data # Handle unconsumed data. if (len(self._unconsumed) > 0 and n > len_readbuffer and self._compress_type == ZIP_DEFLATED): data = self._decompressor.decompress( self._unconsumed, max(n - len_readbuffer, self.MIN_READ_SIZE) ) self._unconsumed = self._decompressor.unconsumed_tail eof = len(self._unconsumed) == 0 and self._compress_left == 0 if eof: data += self._decompressor.flush() self._update_crc(data, eof=eof) self._readbuffer = self._readbuffer[self._offset:] + data self._offset = 0 # Read from buffer. data = self._readbuffer[self._offset: self._offset + n] self._offset += len(data) return data def close(self): try : if self._close_fileobj: self._fileobj.close() finally: super(ZipExtFile, self).close() class ZipFile(object): """ Class with methods to open, read, write, close, list zip files. z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=False) file: Either the path to the file, or a file-like object. If it is a path, the file will be opened and closed by ZipFile. mode: The mode can be either read "r", write "w" or append "a". compression: ZIP_STORED (no compression) or ZIP_DEFLATED (requires zlib). allowZip64: if True ZipFile will create files with ZIP64 extensions when needed, otherwise it will raise an exception when this would be necessary. """ fp = None # Set here since __del__ checks it def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=False): """Open the ZIP file with mode read "r", write "w" or append "a".""" if mode not in ("r", "w", "a"): raise RuntimeError('ZipFile() requires mode "r", "w", or "a"') if compression == ZIP_STORED: pass elif compression == ZIP_DEFLATED: if not zlib: raise RuntimeError,\ "Compression requires the (missing) zlib module" else: raise RuntimeError, "That compression method is not supported" self._allowZip64 = allowZip64 self._didModify = False self.debug = 0 # Level of printing: 0 through 3 self.NameToInfo = {} # Find file info given name self.filelist = [] # List of ZipInfo instances for archive self.compression = compression # Method of compression self.mode = key = mode.replace('b', '')[0] self.pwd = None self._comment = '' # Check if we were passed a file-like object if isinstance(file, basestring): self._filePassed = 0 self.filename = file modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'} try: self.fp = open(file, modeDict[mode]) except IOError: if mode == 'a': mode = key = 'w' self.fp = open(file, modeDict[mode]) else: raise else: self._filePassed = 1 self.fp = file self.filename = getattr(file, 'name', None) try: if key == 'r': self._RealGetContents() elif key == 'w': # set the modified flag so central directory gets written # even if no files are added to the archive self._didModify = True elif key == 'a': try: # See if file is a zip file self._RealGetContents() # seek to start of directory and overwrite self.fp.seek(self.start_dir, 0) except BadZipfile: # file is not a zip file, just append self.fp.seek(0, 2) # set the modified flag so central directory gets written # even if no files are added to the archive self._didModify = True else: raise RuntimeError('Mode must be "r", "w" or "a"') except: fp = self.fp self.fp = None if not self._filePassed: fp.close() raise def __enter__(self): return self def __exit__(self, type, value, traceback): self.close() def _RealGetContents(self): """Read in the table of contents for the ZIP file.""" fp = self.fp try: endrec = _EndRecData(fp) except IOError: raise BadZipfile("File is not a zip file") if not endrec: raise BadZipfile, "File is not a zip file" if self.debug > 1: print endrec size_cd = endrec[_ECD_SIZE] # bytes in central directory offset_cd = endrec[_ECD_OFFSET] # offset of central directory self._comment = endrec[_ECD_COMMENT] # archive comment # "concat" is zero, unless zip was concatenated to another file concat = endrec[_ECD_LOCATION] - size_cd - offset_cd if endrec[_ECD_SIGNATURE] == stringEndArchive64: # If Zip64 extension structures are present, account for them concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator) if self.debug > 2: inferred = concat + offset_cd print "given, inferred, offset", offset_cd, inferred, concat # self.start_dir: Position of start of central directory self.start_dir = offset_cd + concat fp.seek(self.start_dir, 0) data = fp.read(size_cd) fp = cStringIO.StringIO(data) total = 0 while total < size_cd: centdir = fp.read(sizeCentralDir) if len(centdir) != sizeCentralDir: raise BadZipfile("Truncated central directory") centdir = struct.unpack(structCentralDir, centdir) if centdir[_CD_SIGNATURE] != stringCentralDir: raise BadZipfile("Bad magic number for central directory") if self.debug > 2: print centdir filename = fp.read(centdir[_CD_FILENAME_LENGTH]) # Create ZipInfo instance to store file information x = ZipInfo(filename) x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH]) x.comment = fp.read(centdir[_CD_COMMENT_LENGTH]) x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET] (x.create_version, x.create_system, x.extract_version, x.reserved, x.flag_bits, x.compress_type, t, d, x.CRC, x.compress_size, x.file_size) = centdir[1:12] x.volume, x.internal_attr, x.external_attr = centdir[15:18] # Convert date/time code to (year, month, day, hour, min, sec) x._raw_time = t x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F, t>>11, (t>>5)&0x3F, (t&0x1F) * 2 ) x._decodeExtra() x.header_offset = x.header_offset + concat x.filename = x._decodeFilename() self.filelist.append(x) self.NameToInfo[x.filename] = x # update total bytes read from central directory total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH] + centdir[_CD_EXTRA_FIELD_LENGTH] + centdir[_CD_COMMENT_LENGTH]) if self.debug > 2: print "total", total def namelist(self): """Return a list of file names in the archive.""" l = [] for data in self.filelist: l.append(data.filename) return l def infolist(self): """Return a list of class ZipInfo instances for files in the archive.""" return self.filelist def printdir(self): """Print a table of contents for the zip file.""" print "%-46s %19s %12s" % ("File Name", "Modified ", "Size") for zinfo in self.filelist: date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6] print "%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size) def testzip(self): """Read all the files and check the CRC.""" chunk_size = 2 ** 20 for zinfo in self.filelist: try: # Read by chunks, to avoid an OverflowError or a # MemoryError with very large embedded files. with self.open(zinfo.filename, "r") as f: while f.read(chunk_size): # Check CRC-32 pass except BadZipfile: return zinfo.filename def getinfo(self, name): """Return the instance of ZipInfo given 'name'.""" info = self.NameToInfo.get(name) if info is None: raise KeyError( 'There is no item named %r in the archive' % name) return info def setpassword(self, pwd): """Set default password for encrypted files.""" self.pwd = pwd @property def comment(self): """The comment text associated with the ZIP file.""" return self._comment @comment.setter def comment(self, comment): # check for valid comment length if len(comment) > ZIP_MAX_COMMENT: import warnings warnings.warn('Archive comment is too long; truncating to %d bytes' % ZIP_MAX_COMMENT, stacklevel=2) comment = comment[:ZIP_MAX_COMMENT] self._comment = comment self._didModify = True def read(self, name, pwd=None): """Return file bytes (as a string) for name.""" return self.open(name, "r", pwd).read() def open(self, name, mode="r", pwd=None): """Return file-like object for 'name'.""" if mode not in ("r", "U", "rU"): raise RuntimeError, 'open() requires mode "r", "U", or "rU"' if not self.fp: raise RuntimeError, \ "Attempt to read ZIP archive that was already closed" # Only open a new file for instances where we were not # given a file object in the constructor if self._filePassed: zef_file = self.fp should_close = False else: zef_file = open(self.filename, 'rb') should_close = True try: # Make sure we have an info object if isinstance(name, ZipInfo): # 'name' is already an info object zinfo = name else: # Get info object for name zinfo = self.getinfo(name) zef_file.seek(zinfo.header_offset, 0) # Skip the file header: fheader = zef_file.read(sizeFileHeader) if len(fheader) != sizeFileHeader: raise BadZipfile("Truncated file header") fheader = struct.unpack(structFileHeader, fheader) if fheader[_FH_SIGNATURE] != stringFileHeader: raise BadZipfile("Bad magic number for file header") fname = zef_file.read(fheader[_FH_FILENAME_LENGTH]) if fheader[_FH_EXTRA_FIELD_LENGTH]: zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH]) if fname != zinfo.orig_filename: raise BadZipfile, \ 'File name in directory "%s" and header "%s" differ.' % ( zinfo.orig_filename, fname) # check for encrypted flag & handle password is_encrypted = zinfo.flag_bits & 0x1 zd = None if is_encrypted: if not pwd: pwd = self.pwd if not pwd: raise RuntimeError, "File %s is encrypted, " \ "password required for extraction" % name zd = _ZipDecrypter(pwd) # The first 12 bytes in the cypher stream is an encryption header # used to strengthen the algorithm. The first 11 bytes are # completely random, while the 12th contains the MSB of the CRC, # or the MSB of the file time depending on the header type # and is used to check the correctness of the password. bytes = zef_file.read(12) h = map(zd, bytes[0:12]) if zinfo.flag_bits & 0x8: # compare against the file type from extended local headers check_byte = (zinfo._raw_time >> 8) & 0xff else: # compare against the CRC otherwise check_byte = (zinfo.CRC >> 24) & 0xff if ord(h[11]) != check_byte: raise RuntimeError("Bad password for file", name) return ZipExtFile(zef_file, mode, zinfo, zd, close_fileobj=should_close) except: if should_close: zef_file.close() raise def extract(self, member, path=None, pwd=None): """Extract a member from the archive to the current working directory, using its full name. Its file information is extracted as accurately as possible. `member' may be a filename or a ZipInfo object. You can specify a different directory using `path'. """ if not isinstance(member, ZipInfo): member = self.getinfo(member) if path is None: path = os.getcwd() return self._extract_member(member, path, pwd) def extractall(self, path=None, members=None, pwd=None): """Extract all members from the archive to the current working directory. `path' specifies a different directory to extract to. `members' is optional and must be a subset of the list returned by namelist(). """ if members is None: members = self.namelist() for zipinfo in members: self.extract(zipinfo, path, pwd) def _extract_member(self, member, targetpath, pwd): """Extract the ZipInfo object 'member' to a physical file on the path targetpath. """ # build the destination pathname, replacing # forward slashes to platform specific separators. arcname = member.filename.replace('/', os.path.sep) if os.path.altsep: arcname = arcname.replace(os.path.altsep, os.path.sep) # interpret absolute pathname as relative, remove drive letter or # UNC path, redundant separators, "." and ".." components. arcname = os.path.splitdrive(arcname)[1] arcname = os.path.sep.join(x for x in arcname.split(os.path.sep) if x not in ('', os.path.curdir, os.path.pardir)) if os.path.sep == '\\': # filter illegal characters on Windows illegal = ':<>\|"?' if isinstance(arcname, unicode): table = {ord(c): ord('_') for c in illegal} else: table = string.maketrans(illegal, '_' len(illegal)) arcname = arcname.translate(table) # remove trailing dots arcname = (x.rstrip('.') for x in arcname.split(os.path.sep)) arcname = os.path.sep.join(x for x in arcname if x) targetpath = os.path.join(targetpath, arcname) targetpath = os.path.normpath(targetpath) # Create all upper directories if necessary. upperdirs = os.path.dirname(targetpath) if upperdirs and not os.path.exists(upperdirs): os.makedirs(upperdirs) if member.filename[-1] == '/': if not os.path.isdir(targetpath): os.mkdir(targetpath) return targetpath with self.open(member, pwd=pwd) as source, \ file(targetpath, "wb") as target: shutil.copyfileobj(source, target) return targetpath def _writecheck(self, zinfo): """Check for errors before writing a file to the archive.""" if zinfo.filename in self.NameToInfo: import warnings warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3) if self.mode not in ("w", "a"): raise RuntimeError, 'write() requires mode "w" or "a"' if not self.fp: raise RuntimeError, \ "Attempt to write ZIP archive that was already closed" if zinfo.compress_type == ZIP_DEFLATED and not zlib: raise RuntimeError, \ "Compression requires the (missing) zlib module" if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED): raise RuntimeError, \ "That compression method is not supported" if not self._allowZip64: requires_zip64 = None if len(self.filelist) >= ZIP_FILECOUNT_LIMIT: requires_zip64 = "Files count" elif zinfo.file_size > ZIP64_LIMIT: requires_zip64 = "Filesize" elif zinfo.header_offset > ZIP64_LIMIT: requires_zip64 = "Zipfile size" if requires_zip64: raise LargeZipFile(requires_zip64 + " would require ZIP64 extensions") def write(self, filename, arcname=None, compress_type=None): """Put the bytes from filename into the archive under the name arcname.""" if not self.fp: raise RuntimeError( "Attempt to write to ZIP archive that was already closed") st = os.stat(filename) isdir = stat.S_ISDIR(st.st_mode) mtime = time.localtime(st.st_mtime) date_time = mtime[0:6] # Create ZipInfo instance to store file information if arcname is None: arcname = filename arcname = os.path.normpath(os.path.splitdrive(arcname)[1]) while arcname[0] in (os.sep, os.altsep): arcname = arcname[1:] if isdir: arcname += '/' zinfo = ZipInfo(arcname, date_time) zinfo.external_attr = (st[0] & 0xFFFF) << 16L # Unix attributes if isdir: zinfo.compress_type = ZIP_STORED elif compress_type is None: zinfo.compress_type = self.compression else: zinfo.compress_type = compress_type zinfo.file_size = st.st_size zinfo.flag_bits = 0x00 zinfo.header_offset = self.fp.tell() # Start of header bytes self._writecheck(zinfo) self._didModify = True if isdir: zinfo.file_size = 0 zinfo.compress_size = 0 zinfo.CRC = 0 zinfo.external_attr \|= 0x10 # MS-DOS directory flag self.filelist.append(zinfo) self.NameToInfo[zinfo.filename] = zinfo self.fp.write(zinfo.FileHeader(False)) return with open(filename, "rb") as fp: # Must overwrite CRC and sizes with correct data later zinfo.CRC = CRC = 0 zinfo.compress_size = compress_size = 0 # Compressed size can be larger than uncompressed size zip64 = self._allowZip64 and \ zinfo.file_size * 1.05 > ZIP64_LIMIT self.fp.write(zinfo.FileHeader(zip64)) if zinfo.compress_type == ZIP_DEFLATED: cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15) else: cmpr = None file_size = 0 while 1: buf = fp.read(1024 * 8) if not buf: break file_size = file_size + len(buf) CRC = crc32(buf, CRC) & 0xffffffff if cmpr: buf = cmpr.compress(buf) compress_size = compress_size + len(buf) self.fp.write(buf) if cmpr: buf = cmpr.flush() compress_size = compress_size + len(buf) self.fp.write(buf) zinfo.compress_size = compress_size else: zinfo.compress_size = file_size zinfo.CRC = CRC zinfo.file_size = file_size if not zip64 and self._allowZip64: if file_size > ZIP64_LIMIT: raise RuntimeError('File size has increased during compressing') if compress_size > ZIP64_LIMIT: raise RuntimeError('Compressed size larger than uncompressed size') # Seek backwards and write file header (which will now include # correct CRC and file sizes) position = self.fp.tell() # Preserve current position in file self.fp.seek(zinfo.header_offset, 0) self.fp.write(zinfo.FileHeader(zip64)) self.fp.seek(position, 0) self.filelist.append(zinfo) self.NameToInfo[zinfo.filename] = zinfo def writestr(self, zinfo_or_arcname, bytes, compress_type=None): """Write a file into the archive. The contents is the string 'bytes'. 'zinfo_or_arcname' is either a ZipInfo instance or the name of the file in the archive.""" if not isinstance(zinfo_or_arcname, ZipInfo): zinfo = ZipInfo(filename=zinfo_or_arcname, date_time=time.localtime(time.time())[:6]) zinfo.compress_type = self.compression if zinfo.filename[-1] == '/': zinfo.external_attr = 0o40775 << 16 # drwxrwxr-x zinfo.external_attr \|= 0x10 # MS-DOS directory flag else: zinfo.external_attr = 0o600 << 16 # ?rw------- else: zinfo = zinfo_or_arcname if not self.fp: raise RuntimeError( "Attempt to write to ZIP archive that was already closed") if compress_type is not None: zinfo.compress_type = compress_type zinfo.file_size = len(bytes) # Uncompressed size zinfo.header_offset = self.fp.tell() # Start of header bytes self._writecheck(zinfo) self._didModify = True zinfo.CRC = crc32(bytes) & 0xffffffff # CRC-32 checksum if zinfo.compress_type == ZIP_DEFLATED: co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15) bytes = co.compress(bytes) + co.flush() zinfo.compress_size = len(bytes) # Compressed size else: zinfo.compress_size = zinfo.file_size zip64 = zinfo.file_size > ZIP64_LIMIT or \ zinfo.compress_size > ZIP64_LIMIT if zip64 and not self._allowZip64: raise LargeZipFile("Filesize would require ZIP64 extensions") self.fp.write(zinfo.FileHeader(zip64)) self.fp.write(bytes) if zinfo.flag_bits & 0x08: # Write CRC and file sizes after the file data fmt = '<LLQQ' if zip64 else '<LLLL' self.fp.write(struct.pack(fmt, _DD_SIGNATURE, zinfo.CRC, zinfo.compress_size, zinfo.file_size)) self.fp.flush() self.filelist.append(zinfo) self.NameToInfo[zinfo.filename] = zinfo def __del__(self): """Call the "close()" method in case the user forgot.""" self.close() def close(self): """Close the file, and for mode "w" and "a" write the ending records.""" if self.fp is None: return try: if self.mode in ("w", "a") and self._didModify: # write ending records pos1 = self.fp.tell() for zinfo in self.filelist: # write central directory dt = zinfo.date_time dosdate = (dt[0] - 1980) << 9 \| dt[1] << 5 \| dt[2] dostime = dt[3] << 11 \| dt[4] << 5 \| (dt[5] // 2) extra = [] if zinfo.file_size > ZIP64_LIMIT \ or zinfo.compress_size > ZIP64_LIMIT: extra.append(zinfo.file_size) extra.append(zinfo.compress_size) file_size = 0xffffffff compress_size = 0xffffffff else: file_size = zinfo.file_size compress_size = zinfo.compress_size if zinfo.header_offset > ZIP64_LIMIT: extra.append(zinfo.header_offset) header_offset = 0xffffffffL else: header_offset = zinfo.header_offset extra_data = zinfo.extra if extra: # Append a ZIP64 field to the extra's extra_data = _strip_extra(extra_data, (1,)) extra_data = struct.pack( '<HH' + 'Q'len(extra), 1, 8len(extra), extra) + extra_data extract_version = max(45, zinfo.extract_version) create_version = max(45, zinfo.create_version) else: extract_version = zinfo.extract_version create_version = zinfo.create_version try: filename, flag_bits = zinfo._encodeFilenameFlags() centdir = struct.pack(structCentralDir, stringCentralDir, create_version, zinfo.create_system, extract_version, zinfo.reserved, flag_bits, zinfo.compress_type, dostime, dosdate, zinfo.CRC, compress_size, file_size, len(filename), len(extra_data), len(zinfo.comment), 0, zinfo.internal_attr, zinfo.external_attr, header_offset) except DeprecationWarning: print >>sys.stderr, (structCentralDir, stringCentralDir, create_version, zinfo.create_system, extract_version, zinfo.reserved, zinfo.flag_bits, zinfo.compress_type, dostime, dosdate, zinfo.CRC, compress_size, file_size, len(zinfo.filename), len(extra_data), len(zinfo.comment), 0, zinfo.internal_attr, zinfo.external_attr, header_offset) raise self.fp.write(centdir) self.fp.write(filename) self.fp.write(extra_data) self.fp.write(zinfo.comment) pos2 = self.fp.tell() # Write end-of-zip-archive record centDirCount = len(self.filelist) centDirSize = pos2 - pos1 centDirOffset = pos1 requires_zip64 = None if centDirCount > ZIP_FILECOUNT_LIMIT: requires_zip64 = "Files count" elif centDirOffset > ZIP64_LIMIT: requires_zip64 = "Central directory offset" elif centDirSize > ZIP64_LIMIT: requires_zip64 = "Central directory size" if requires_zip64: # Need to write the ZIP64 end-of-archive records if not self._allowZip64: raise LargeZipFile(requires_zip64 + " would require ZIP64 extensions") zip64endrec = struct.pack( structEndArchive64, stringEndArchive64, 44, 45, 45, 0, 0, centDirCount, centDirCount, centDirSize, centDirOffset) self.fp.write(zip64endrec) zip64locrec = struct.pack( structEndArchive64Locator, stringEndArchive64Locator, 0, pos2, 1) self.fp.write(zip64locrec) centDirCount = min(centDirCount, 0xFFFF) centDirSize = min(centDirSize, 0xFFFFFFFF) centDirOffset = min(centDirOffset, 0xFFFFFFFF) endrec = struct.pack(structEndArchive, stringEndArchive, 0, 0, centDirCount, centDirCount, centDirSize, centDirOffset, len(self._comment)) self.fp.write(endrec) self.fp.write(self._comment) self.fp.flush() finally: fp = self.fp self.fp = None if not self._filePassed: fp.close() class PyZipFile(ZipFile): """Class to create ZIP archives with Python library files and packages.""" def writepy(self, pathname, basename = ""): """Add all files from "pathname" to the ZIP archive. If pathname is a package directory, search the directory and all package subdirectories recursively for all .py and enter the modules into the archive. If pathname is a plain directory, listdir .py and enter all modules. Else, pathname must be a Python .py file and the module will be put into the archive. Added modules are always module.pyo or module.pyc. This method will compile the module.py into module.pyc if necessary. """ dir, name = os.path.split(pathname) if os.path.isdir(pathname): initname = os.path.join(pathname, "__init__.py") if os.path.isfile(initname): # This is a package directory, add it if basename: basename = "%s/%s" % (basename, name) else: basename = name if self.debug: print "Adding package in", pathname, "as", basename fname, arcname = self._get_codename(initname[0:-3], basename) if self.debug: print "Adding", arcname self.write(fname, arcname) dirlist = os.listdir(pathname) dirlist.remove("__init__.py") # Add all *.py files and package subdirectories for filename in dirlist: path = os.path.join(pathname, filename) root, ext = os.path.splitext(filename) if os.path.isdir(path): if os.path.isfile(os.path.join(path, "__init__.py")): # This is a package directory, add it self.writepy(path, basename) # Recursive call elif ext == ".py": fname, arcname = self._get_codename(path[0:-3], basename) if self.debug: print "Adding", arcname self.write(fname, arcname) else: # This is NOT a package directory, add its files at top level if self.debug: print "Adding files from directory", pathname for filename in os.listdir(pathname): path = os.path.join(pathname, filename) root, ext = os.path.splitext(filename) if ext == ".py": fname, arcname = self._get_codename(path[0:-3], basename) if self.debug: print "Adding", arcname self.write(fname, arcname) else: if pathname[-3:] != ".py": raise RuntimeError, \ 'Files added with writepy() must end with ".py"' fname, arcname = self._get_codename(pathname[0:-3], basename) if self.debug: print "Adding file", arcname self.write(fname, arcname) def _get_codename(self, pathname, basename): """Return (filename, archivename) for the path. Given a module name path, return the correct file path and archive name, compiling if necessary. For example, given /python/lib/string, return (/python/lib/string.pyc, string). """ file_py = pathname + ".py" file_pyc = pathname + ".pyc" file_pyo = pathname + ".pyo" if os.path.isfile(file_pyo) and \ os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime: fname = file_pyo # Use .pyo file elif not os.path.isfile(file_pyc) or \ os.stat(file_pyc).st_mtime < os.stat(file_py).st_mtime: import py_compile if self.debug: print "Compiling", file_py try: py_compile.compile(file_py, file_pyc, None, True) except py_compile.PyCompileError,err: print err.msg fname = file_pyc else: fname = file_pyc archivename = os.path.split(fname)[1] if basename: archivename = "%s/%s" % (basename, archivename) return (fname, archivename) def main(args = None): import textwrap USAGE=textwrap.dedent("""\ Usage: zipfile.py -l zipfile.zip # Show listing of a zipfile zipfile.py -t zipfile.zip # Test if a zipfile is valid zipfile.py -e zipfile.zip target # Extract zipfile into target dir zipfile.py -c zipfile.zip src ... # Create zipfile from sources """) if args is None: args = sys.argv[1:] if not args or args[0] not in ('-l', '-c', '-e', '-t'): print USAGE sys.exit(1) if args[0] == '-l': if len(args) != 2: print USAGE sys.exit(1) with ZipFile(args[1], 'r') as zf: zf.printdir() elif args[0] == '-t': if len(args) != 2: print USAGE sys.exit(1) with ZipFile(args[1], 'r') as zf: badfile = zf.testzip() if badfile: print("The following enclosed file is corrupted: {!r}".format(badfile)) print "Done testing" elif args[0] == '-e': if len(args) != 3: print USAGE sys.exit(1) with ZipFile(args[1], 'r') as zf: zf.extractall(args[2]) elif args[0] == '-c': if len(args) < 3: print USAGE sys.exit(1) def addToZip(zf, path, zippath): if os.path.isfile(path): zf.write(path, zippath, ZIP_DEFLATED) elif os.path.isdir(path): if zippath: zf.write(path, zippath) for nm in os.listdir(path): addToZip(zf, os.path.join(path, nm), os.path.join(zippath, nm)) # else: ignore with ZipFile(args[1], 'w', allowZip64=True) as zf: for path in args[2:]: zippath = os.path.basename(path) if not zippath: zippath = os.path.basename(os.path.dirname(path)) if zippath in ('', os.curdir, os.pardir): zippath = '' addToZip(zf, path, zippath) if __name__ == "__main__": main() Back

Edit File : zipfile.py | Size : 58.08 KB

"""
Read and write ZIP files.
"""
import struct, os, time, sys, shutil
import binascii, cStringIO, stat
import io
import re
import string

try:
    import zlib # We may need its compression method
    crc32 = zlib.crc32
except ImportError:
    zlib = None
    crc32 = binascii.crc32

__all__ = ["BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "is_zipfile",
           "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile" ]

class BadZipfile(Exception):
    pass

class LargeZipFile(Exception):
    """
    Raised when writing a zipfile, the zipfile requires ZIP64 extensions
    and those extensions are disabled.
    """

error = BadZipfile      # The exception raised by this module

ZIP64_LIMIT = (1 << 31) - 1
ZIP_FILECOUNT_LIMIT = (1 << 16) - 1
ZIP_MAX_COMMENT = (1 << 16) - 1

# constants for Zip file compression methods
ZIP_STORED = 0
ZIP_DEFLATED = 8
# Other ZIP compression methods not supported

# Below are some formats and associated data for reading/writing headers using
# the struct module.  The names and structures of headers/records are those used
# in the PKWARE description of the ZIP file format:
#     http://www.pkware.com/documents/casestudies/APPNOTE.TXT
# (URL valid as of January 2008)

# The "end of central directory" structure, magic number, size, and indices
# (section V.I in the format document)
structEndArchive = "<4s4H2LH"
stringEndArchive = "PK\005\006"
sizeEndCentDir = struct.calcsize(structEndArchive)

_ECD_SIGNATURE = 0
_ECD_DISK_NUMBER = 1
_ECD_DISK_START = 2
_ECD_ENTRIES_THIS_DISK = 3
_ECD_ENTRIES_TOTAL = 4
_ECD_SIZE = 5
_ECD_OFFSET = 6
_ECD_COMMENT_SIZE = 7
# These last two indices are not part of the structure as defined in the
# spec, but they are used internally by this module as a convenience
_ECD_COMMENT = 8
_ECD_LOCATION = 9

# The "central directory" structure, magic number, size, and indices
# of entries in the structure (section V.F in the format document)
structCentralDir = "<4s4B4HL2L5H2L"
stringCentralDir = "PK\001\002"
sizeCentralDir = struct.calcsize(structCentralDir)

# indexes of entries in the central directory structure
_CD_SIGNATURE = 0
_CD_CREATE_VERSION = 1
_CD_CREATE_SYSTEM = 2
_CD_EXTRACT_VERSION = 3
_CD_EXTRACT_SYSTEM = 4
_CD_FLAG_BITS = 5
_CD_COMPRESS_TYPE = 6
_CD_TIME = 7
_CD_DATE = 8
_CD_CRC = 9
_CD_COMPRESSED_SIZE = 10
_CD_UNCOMPRESSED_SIZE = 11
_CD_FILENAME_LENGTH = 12
_CD_EXTRA_FIELD_LENGTH = 13
_CD_COMMENT_LENGTH = 14
_CD_DISK_NUMBER_START = 15
_CD_INTERNAL_FILE_ATTRIBUTES = 16
_CD_EXTERNAL_FILE_ATTRIBUTES = 17
_CD_LOCAL_HEADER_OFFSET = 18

# The "local file header" structure, magic number, size, and indices
# (section V.A in the format document)
structFileHeader = "<4s2B4HL2L2H"
stringFileHeader = "PK\003\004"
sizeFileHeader = struct.calcsize(structFileHeader)

_FH_SIGNATURE = 0
_FH_EXTRACT_VERSION = 1
_FH_EXTRACT_SYSTEM = 2
_FH_GENERAL_PURPOSE_FLAG_BITS = 3
_FH_COMPRESSION_METHOD = 4
_FH_LAST_MOD_TIME = 5
_FH_LAST_MOD_DATE = 6
_FH_CRC = 7
_FH_COMPRESSED_SIZE = 8
_FH_UNCOMPRESSED_SIZE = 9
_FH_FILENAME_LENGTH = 10
_FH_EXTRA_FIELD_LENGTH = 11

# The "Zip64 end of central directory locator" structure, magic number, and size
structEndArchive64Locator = "<4sLQL"
stringEndArchive64Locator = "PK\x06\x07"
sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator)

# The "Zip64 end of central directory" record, magic number, size, and indices
# (section V.G in the format document)
structEndArchive64 = "<4sQ2H2L4Q"
stringEndArchive64 = "PK\x06\x06"
sizeEndCentDir64 = struct.calcsize(structEndArchive64)

_CD64_SIGNATURE = 0
_CD64_DIRECTORY_RECSIZE = 1
_CD64_CREATE_VERSION = 2
_CD64_EXTRACT_VERSION = 3
_CD64_DISK_NUMBER = 4
_CD64_DISK_NUMBER_START = 5
_CD64_NUMBER_ENTRIES_THIS_DISK = 6
_CD64_NUMBER_ENTRIES_TOTAL = 7
_CD64_DIRECTORY_SIZE = 8
_CD64_OFFSET_START_CENTDIR = 9

_DD_SIGNATURE = 0x08074b50

_EXTRA_FIELD_STRUCT = struct.Struct('<HH')

def _strip_extra(extra, xids):
    # Remove Extra Fields with specified IDs.
    unpack = _EXTRA_FIELD_STRUCT.unpack
    modified = False
    buffer = []
    start = i = 0
    while i + 4 <= len(extra):
        xid, xlen = unpack(extra[i : i + 4])
        j = i + 4 + xlen
        if xid in xids:
            if i != start:
                buffer.append(extra[start : i])
            start = j
            modified = True
        i = j
    if not modified:
        return extra
    return b''.join(buffer)

def _check_zipfile(fp):
    try:
        if _EndRecData(fp):
            return True         # file has correct magic number
    except IOError:
        pass
    return False

def is_zipfile(filename):
    """Quickly see if a file is a ZIP file by checking the magic number.

The filename argument may be a file or file-like object too.
    """
    result = False
    try:
        if hasattr(filename, "read"):
            result = _check_zipfile(fp=filename)
        else:
            with open(filename, "rb") as fp:
                result = _check_zipfile(fp)
    except IOError:
        pass
    return result

def _EndRecData64(fpin, offset, endrec):
    """
    Read the ZIP64 end-of-archive records and use that to update endrec
    """
    try:
        fpin.seek(offset - sizeEndCentDir64Locator, 2)
    except IOError:
        # If the seek fails, the file is not large enough to contain a ZIP64
        # end-of-archive record, so just return the end record we were given.
        return endrec

data = fpin.read(sizeEndCentDir64Locator)
    if len(data) != sizeEndCentDir64Locator:
        return endrec
    sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data)
    if sig != stringEndArchive64Locator:
        return endrec

if diskno != 0 or disks != 1:
        raise BadZipfile("zipfiles that span multiple disks are not supported")

# Assume no 'zip64 extensible data'
    fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2)
    data = fpin.read(sizeEndCentDir64)
    if len(data) != sizeEndCentDir64:
        return endrec
    sig, sz, create_version, read_version, disk_num, disk_dir, \
            dircount, dircount2, dirsize, diroffset = \
            struct.unpack(structEndArchive64, data)
    if sig != stringEndArchive64:
        return endrec

# Update the original endrec using data from the ZIP64 record
    endrec[_ECD_SIGNATURE] = sig
    endrec[_ECD_DISK_NUMBER] = disk_num
    endrec[_ECD_DISK_START] = disk_dir
    endrec[_ECD_ENTRIES_THIS_DISK] = dircount
    endrec[_ECD_ENTRIES_TOTAL] = dircount2
    endrec[_ECD_SIZE] = dirsize
    endrec[_ECD_OFFSET] = diroffset
    return endrec

def _EndRecData(fpin):
    """Return data from the "End of Central Directory" record, or None.

The data is a list of the nine items in the ZIP "End of central dir"
    record followed by a tenth item, the file seek offset of this record."""

# Determine file size
    fpin.seek(0, 2)
    filesize = fpin.tell()

# Check to see if this is ZIP file with no archive comment (the
    # "end of central directory" structure should be the last item in the
    # file if this is the case).
    try:
        fpin.seek(-sizeEndCentDir, 2)
    except IOError:
        return None
    data = fpin.read()
    if (len(data) == sizeEndCentDir and
        data[0:4] == stringEndArchive and
        data[-2:] == b"\000\000"):
        # the signature is correct and there's no comment, unpack structure
        endrec = struct.unpack(structEndArchive, data)
        endrec=list(endrec)

# Append a blank comment and record start offset
        endrec.append("")
        endrec.append(filesize - sizeEndCentDir)

# Try to read the "Zip64 end of central directory" structure
        return _EndRecData64(fpin, -sizeEndCentDir, endrec)

# Either this is not a ZIP file, or it is a ZIP file with an archive
    # comment.  Search the end of the file for the "end of central directory"
    # record signature. The comment is the last item in the ZIP file and may be
    # up to 64K long.  It is assumed that the "end of central directory" magic
    # number does not appear in the comment.
    maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0)
    fpin.seek(maxCommentStart, 0)
    data = fpin.read()
    start = data.rfind(stringEndArchive)
    if start >= 0:
        # found the magic number; attempt to unpack and interpret
        recData = data[start:start+sizeEndCentDir]
        if len(recData) != sizeEndCentDir:
            # Zip file is corrupted.
            return None
        endrec = list(struct.unpack(structEndArchive, recData))
        commentSize = endrec[_ECD_COMMENT_SIZE] #as claimed by the zip file
        comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize]
        endrec.append(comment)
        endrec.append(maxCommentStart + start)

# Try to read the "Zip64 end of central directory" structure
        return _EndRecData64(fpin, maxCommentStart + start - filesize,
                             endrec)

# Unable to find a valid end of central directory structure
    return None

class ZipInfo (object):
    """Class with attributes describing each file in the ZIP archive."""

__slots__ = (
            'orig_filename',
            'filename',
            'date_time',
            'compress_type',
            'comment',
            'extra',
            'create_system',
            'create_version',
            'extract_version',
            'reserved',
            'flag_bits',
            'volume',
            'internal_attr',
            'external_attr',
            'header_offset',
            'CRC',
            'compress_size',
            'file_size',
            '_raw_time',
        )

def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
        self.orig_filename = filename   # Original file name in archive

# Terminate the file name at the first null byte.  Null bytes in file
        # names are used as tricks by viruses in archives.
        null_byte = filename.find(chr(0))
        if null_byte >= 0:
            filename = filename[0:null_byte]
        # This is used to ensure paths in generated ZIP files always use
        # forward slashes as the directory separator, as required by the
        # ZIP format specification.
        if os.sep != "/" and os.sep in filename:
            filename = filename.replace(os.sep, "/")

self.filename = filename        # Normalized file name
        self.date_time = date_time      # year, month, day, hour, min, sec

if date_time[0] < 1980:
            raise ValueError('ZIP does not support timestamps before 1980')

# Standard values:
        self.compress_type = ZIP_STORED # Type of compression for the file
        self.comment = ""               # Comment for each file
        self.extra = ""                 # ZIP extra data
        if sys.platform == 'win32':
            self.create_system = 0          # System which created ZIP archive
        else:
            # Assume everything else is unix-y
            self.create_system = 3          # System which created ZIP archive
        self.create_version = 20        # Version which created ZIP archive
        self.extract_version = 20       # Version needed to extract archive
        self.reserved = 0               # Must be zero
        self.flag_bits = 0              # ZIP flag bits
        self.volume = 0                 # Volume number of file header
        self.internal_attr = 0          # Internal attributes
        self.external_attr = 0          # External file attributes
        # Other attributes are set by class ZipFile:
        # header_offset         Byte offset to the file header
        # CRC                   CRC-32 of the uncompressed file
        # compress_size         Size of the compressed file
        # file_size             Size of the uncompressed file

def FileHeader(self, zip64=None):
        """Return the per-file header as a string."""
        dt = self.date_time
        dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
        dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
        if self.flag_bits & 0x08:
            # Set these to zero because we write them after the file data
            CRC = compress_size = file_size = 0
        else:
            CRC = self.CRC
            compress_size = self.compress_size
            file_size = self.file_size

extra = self.extra

if zip64 is None:
            zip64 = file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT
        if zip64:
            fmt = '<HHQQ'
            extra = extra + struct.pack(fmt,
                    1, struct.calcsize(fmt)-4, file_size, compress_size)
        if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
            if not zip64:
                raise LargeZipFile("Filesize would require ZIP64 extensions")
            # File is larger than what fits into a 4 byte integer,
            # fall back to the ZIP64 extension
            file_size = 0xffffffff
            compress_size = 0xffffffff
            self.extract_version = max(45, self.extract_version)
            self.create_version = max(45, self.extract_version)

filename, flag_bits = self._encodeFilenameFlags()
        header = struct.pack(structFileHeader, stringFileHeader,
                 self.extract_version, self.reserved, flag_bits,
                 self.compress_type, dostime, dosdate, CRC,
                 compress_size, file_size,
                 len(filename), len(extra))
        return header + filename + extra

def _encodeFilenameFlags(self):
        if isinstance(self.filename, unicode):
            try:
                return self.filename.encode('ascii'), self.flag_bits
            except UnicodeEncodeError:
                return self.filename.encode('utf-8'), self.flag_bits | 0x800
        else:
            return self.filename, self.flag_bits

def _decodeFilename(self):
        if self.flag_bits & 0x800:
            return self.filename.decode('utf-8')
        else:
            return self.filename

def _decodeExtra(self):
        # Try to decode the extra field.
        extra = self.extra
        unpack = struct.unpack
        while len(extra) >= 4:
            tp, ln = unpack('<HH', extra[:4])
            if tp == 1:
                if ln >= 24:
                    counts = unpack('<QQQ', extra[4:28])
                elif ln == 16:
                    counts = unpack('<QQ', extra[4:20])
                elif ln == 8:
                    counts = unpack('<Q', extra[4:12])
                elif ln == 0:
                    counts = ()
                else:
                    raise RuntimeError, "Corrupt extra field %s"%(ln,)

idx = 0

# ZIP64 extension (large files and/or large archives)
                if self.file_size in (0xffffffffffffffffL, 0xffffffffL):
                    self.file_size = counts[idx]
                    idx += 1

if self.compress_size == 0xFFFFFFFFL:
                    self.compress_size = counts[idx]
                    idx += 1

if self.header_offset == 0xffffffffL:
                    old = self.header_offset
                    self.header_offset = counts[idx]
                    idx+=1

extra = extra[ln+4:]

class _ZipDecrypter:
    """Class to handle decryption of files stored within a ZIP archive.

ZIP supports a password-based form of encryption. Even though known
    plaintext attacks have been found against it, it is still useful
    to be able to get data out of such a file.

Usage:
        zd = _ZipDecrypter(mypwd)
        plain_char = zd(cypher_char)
        plain_text = map(zd, cypher_text)
    """

def _GenerateCRCTable():
        """Generate a CRC-32 table.

ZIP encryption uses the CRC32 one-byte primitive for scrambling some
        internal keys. We noticed that a direct implementation is faster than
        relying on binascii.crc32().
        """
        poly = 0xedb88320
        table = [0] * 256
        for i in range(256):
            crc = i
            for j in range(8):
                if crc & 1:
                    crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly
                else:
                    crc = ((crc >> 1) & 0x7FFFFFFF)
            table[i] = crc
        return table
    crctable = _GenerateCRCTable()

def _crc32(self, ch, crc):
        """Compute the CRC32 primitive on one byte."""
        return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ord(ch)) & 0xff]

def __init__(self, pwd):
        self.key0 = 305419896
        self.key1 = 591751049
        self.key2 = 878082192
        for p in pwd:
            self._UpdateKeys(p)

def _UpdateKeys(self, c):
        self.key0 = self._crc32(c, self.key0)
        self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295
        self.key1 = (self.key1 * 134775813 + 1) & 4294967295
        self.key2 = self._crc32(chr((self.key1 >> 24) & 255), self.key2)

def __call__(self, c):
        """Decrypt a single character."""
        c = ord(c)
        k = self.key2 | 2
        c = c ^ (((k * (k^1)) >> 8) & 255)
        c = chr(c)
        self._UpdateKeys(c)
        return c

compressor_names = {
    0: 'store',
    1: 'shrink',
    2: 'reduce',
    3: 'reduce',
    4: 'reduce',
    5: 'reduce',
    6: 'implode',
    7: 'tokenize',
    8: 'deflate',
    9: 'deflate64',
    10: 'implode',
    12: 'bzip2',
    14: 'lzma',
    18: 'terse',
    19: 'lz77',
    97: 'wavpack',
    98: 'ppmd',
}

class ZipExtFile(io.BufferedIOBase):
    """File-like object for reading an archive member.
       Is returned by ZipFile.open().
    """

# Max size supported by decompressor.
    MAX_N = 1 << 31 - 1

# Read from compressed files in 4k blocks.
    MIN_READ_SIZE = 4096

# Search for universal newlines or line chunks.
    PATTERN = re.compile(r'^(?P<chunk>[^\r\n]+)|(?P<newline>\n|\r\n?)')

def __init__(self, fileobj, mode, zipinfo, decrypter=None,
            close_fileobj=False):
        self._fileobj = fileobj
        self._decrypter = decrypter
        self._close_fileobj = close_fileobj

self._compress_type = zipinfo.compress_type
        self._compress_size = zipinfo.compress_size
        self._compress_left = zipinfo.compress_size

if self._compress_type == ZIP_DEFLATED:
            self._decompressor = zlib.decompressobj(-15)
        elif self._compress_type != ZIP_STORED:
            descr = compressor_names.get(self._compress_type)
            if descr:
                raise NotImplementedError("compression type %d (%s)" % (self._compress_type, descr))
            else:
                raise NotImplementedError("compression type %d" % (self._compress_type,))
        self._unconsumed = ''

self._readbuffer = ''
        self._offset = 0

self._universal = 'U' in mode
        self.newlines = None

# Adjust read size for encrypted files since the first 12 bytes
        # are for the encryption/password information.
        if self._decrypter is not None:
            self._compress_left -= 12

self.mode = mode
        self.name = zipinfo.filename

if hasattr(zipinfo, 'CRC'):
            self._expected_crc = zipinfo.CRC
            self._running_crc = crc32(b'') & 0xffffffff
        else:
            self._expected_crc = None

def readline(self, limit=-1):
        """Read and return a line from the stream.

If limit is specified, at most limit bytes will be read.
        """

if not self._universal and limit < 0:
            # Shortcut common case - newline found in buffer.
            i = self._readbuffer.find('\n', self._offset) + 1
            if i > 0:
                line = self._readbuffer[self._offset: i]
                self._offset = i
                return line

if not self._universal:
            return io.BufferedIOBase.readline(self, limit)

line = ''
        while limit < 0 or len(line) < limit:
            readahead = self.peek(2)
            if readahead == '':
                return line

#
            # Search for universal newlines or line chunks.
            #
            # The pattern returns either a line chunk or a newline, but not
            # both. Combined with peek(2), we are assured that the sequence
            # '\r\n' is always retrieved completely and never split into
            # separate newlines - '\r', '\n' due to coincidental readaheads.
            #
            match = self.PATTERN.search(readahead)
            newline = match.group('newline')
            if newline is not None:
                if self.newlines is None:
                    self.newlines = []
                if newline not in self.newlines:
                    self.newlines.append(newline)
                self._offset += len(newline)
                return line + '\n'

chunk = match.group('chunk')
            if limit >= 0:
                chunk = chunk[: limit - len(line)]

self._offset += len(chunk)
            line += chunk

return line

def peek(self, n=1):
        """Returns buffered bytes without advancing the position."""
        if n > len(self._readbuffer) - self._offset:
            chunk = self.read(n)
            if len(chunk) > self._offset:
                self._readbuffer = chunk + self._readbuffer[self._offset:]
                self._offset = 0
            else:
                self._offset -= len(chunk)

# Return up to 512 bytes to reduce allocation overhead for tight loops.
        return self._readbuffer[self._offset: self._offset + 512]

def readable(self):
        return True

def read(self, n=-1):
        """Read and return up to n bytes.
        If the argument is omitted, None, or negative, data is read and returned until EOF is reached..
        """
        buf = ''
        if n is None:
            n = -1
        while True:
            if n < 0:
                data = self.read1(n)
            elif n > len(buf):
                data = self.read1(n - len(buf))
            else:
                return buf
            if len(data) == 0:
                return buf
            buf += data

def _update_crc(self, newdata, eof):
        # Update the CRC using the given data.
        if self._expected_crc is None:
            # No need to compute the CRC if we don't have a reference value
            return
        self._running_crc = crc32(newdata, self._running_crc) & 0xffffffff
        # Check the CRC if we're at the end of the file
        if eof and self._running_crc != self._expected_crc:
            raise BadZipfile("Bad CRC-32 for file %r" % self.name)

def read1(self, n):
        """Read up to n bytes with at most one read() system call."""

# Simplify algorithm (branching) by transforming negative n to large n.
        if n < 0 or n is None:
            n = self.MAX_N

# Bytes available in read buffer.
        len_readbuffer = len(self._readbuffer) - self._offset

# Read from file.
        if self._compress_left > 0 and n > len_readbuffer + len(self._unconsumed):
            nbytes = n - len_readbuffer - len(self._unconsumed)
            nbytes = max(nbytes, self.MIN_READ_SIZE)
            nbytes = min(nbytes, self._compress_left)

data = self._fileobj.read(nbytes)
            self._compress_left -= len(data)

if data and self._decrypter is not None:
                data = ''.join(map(self._decrypter, data))

if self._compress_type == ZIP_STORED:
                self._update_crc(data, eof=(self._compress_left==0))
                self._readbuffer = self._readbuffer[self._offset:] + data
                self._offset = 0
            else:
                # Prepare deflated bytes for decompression.
                self._unconsumed += data

# Handle unconsumed data.
        if (len(self._unconsumed) > 0 and n > len_readbuffer and
            self._compress_type == ZIP_DEFLATED):
            data = self._decompressor.decompress(
                self._unconsumed,
                max(n - len_readbuffer, self.MIN_READ_SIZE)
            )

self._unconsumed = self._decompressor.unconsumed_tail
            eof = len(self._unconsumed) == 0 and self._compress_left == 0
            if eof:
                data += self._decompressor.flush()

self._update_crc(data, eof=eof)
            self._readbuffer = self._readbuffer[self._offset:] + data
            self._offset = 0

# Read from buffer.
        data = self._readbuffer[self._offset: self._offset + n]
        self._offset += len(data)
        return data

def close(self):
        try :
            if self._close_fileobj:
                self._fileobj.close()
        finally:
            super(ZipExtFile, self).close()

class ZipFile(object):
    """ Class with methods to open, read, write, close, list zip files.

z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=False)

file: Either the path to the file, or a file-like object.
          If it is a path, the file will be opened and closed by ZipFile.
    mode: The mode can be either read "r", write "w" or append "a".
    compression: ZIP_STORED (no compression) or ZIP_DEFLATED (requires zlib).
    allowZip64: if True ZipFile will create files with ZIP64 extensions when
                needed, otherwise it will raise an exception when this would
                be necessary.

"""

fp = None                   # Set here since __del__ checks it

def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=False):
        """Open the ZIP file with mode read "r", write "w" or append "a"."""
        if mode not in ("r", "w", "a"):
            raise RuntimeError('ZipFile() requires mode "r", "w", or "a"')

if compression == ZIP_STORED:
            pass
        elif compression == ZIP_DEFLATED:
            if not zlib:
                raise RuntimeError,\
                      "Compression requires the (missing) zlib module"
        else:
            raise RuntimeError, "That compression method is not supported"

self._allowZip64 = allowZip64
        self._didModify = False
        self.debug = 0  # Level of printing: 0 through 3
        self.NameToInfo = {}    # Find file info given name
        self.filelist = []      # List of ZipInfo instances for archive
        self.compression = compression  # Method of compression
        self.mode = key = mode.replace('b', '')[0]
        self.pwd = None
        self._comment = ''

# Check if we were passed a file-like object
        if isinstance(file, basestring):
            self._filePassed = 0
            self.filename = file
            modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'}
            try:
                self.fp = open(file, modeDict[mode])
            except IOError:
                if mode == 'a':
                    mode = key = 'w'
                    self.fp = open(file, modeDict[mode])
                else:
                    raise
        else:
            self._filePassed = 1
            self.fp = file
            self.filename = getattr(file, 'name', None)

try:
            if key == 'r':
                self._RealGetContents()
            elif key == 'w':
                # set the modified flag so central directory gets written
                # even if no files are added to the archive
                self._didModify = True
            elif key == 'a':
                try:
                    # See if file is a zip file
                    self._RealGetContents()
                    # seek to start of directory and overwrite
                    self.fp.seek(self.start_dir, 0)
                except BadZipfile:
                    # file is not a zip file, just append
                    self.fp.seek(0, 2)

# set the modified flag so central directory gets written
                    # even if no files are added to the archive
                    self._didModify = True
            else:
                raise RuntimeError('Mode must be "r", "w" or "a"')
        except:
            fp = self.fp
            self.fp = None
            if not self._filePassed:
                fp.close()
            raise

def __enter__(self):
        return self

def __exit__(self, type, value, traceback):
        self.close()

def _RealGetContents(self):
        """Read in the table of contents for the ZIP file."""
        fp = self.fp
        try:
            endrec = _EndRecData(fp)
        except IOError:
            raise BadZipfile("File is not a zip file")
        if not endrec:
            raise BadZipfile, "File is not a zip file"
        if self.debug > 1:
            print endrec
        size_cd = endrec[_ECD_SIZE]             # bytes in central directory
        offset_cd = endrec[_ECD_OFFSET]         # offset of central directory
        self._comment = endrec[_ECD_COMMENT]    # archive comment

# "concat" is zero, unless zip was concatenated to another file
        concat = endrec[_ECD_LOCATION] - size_cd - offset_cd
        if endrec[_ECD_SIGNATURE] == stringEndArchive64:
            # If Zip64 extension structures are present, account for them
            concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator)

if self.debug > 2:
            inferred = concat + offset_cd
            print "given, inferred, offset", offset_cd, inferred, concat
        # self.start_dir:  Position of start of central directory
        self.start_dir = offset_cd + concat
        fp.seek(self.start_dir, 0)
        data = fp.read(size_cd)
        fp = cStringIO.StringIO(data)
        total = 0
        while total < size_cd:
            centdir = fp.read(sizeCentralDir)
            if len(centdir) != sizeCentralDir:
                raise BadZipfile("Truncated central directory")
            centdir = struct.unpack(structCentralDir, centdir)
            if centdir[_CD_SIGNATURE] != stringCentralDir:
                raise BadZipfile("Bad magic number for central directory")
            if self.debug > 2:
                print centdir
            filename = fp.read(centdir[_CD_FILENAME_LENGTH])
            # Create ZipInfo instance to store file information
            x = ZipInfo(filename)
            x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH])
            x.comment = fp.read(centdir[_CD_COMMENT_LENGTH])
            x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET]
            (x.create_version, x.create_system, x.extract_version, x.reserved,
                x.flag_bits, x.compress_type, t, d,
                x.CRC, x.compress_size, x.file_size) = centdir[1:12]
            x.volume, x.internal_attr, x.external_attr = centdir[15:18]
            # Convert date/time code to (year, month, day, hour, min, sec)
            x._raw_time = t
            x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F,
                                     t>>11, (t>>5)&0x3F, (t&0x1F) * 2 )

x._decodeExtra()
            x.header_offset = x.header_offset + concat
            x.filename = x._decodeFilename()
            self.filelist.append(x)
            self.NameToInfo[x.filename] = x

# update total bytes read from central directory
            total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH]
                     + centdir[_CD_EXTRA_FIELD_LENGTH]
                     + centdir[_CD_COMMENT_LENGTH])

if self.debug > 2:
                print "total", total

def namelist(self):
        """Return a list of file names in the archive."""
        l = []
        for data in self.filelist:
            l.append(data.filename)
        return l

def infolist(self):
        """Return a list of class ZipInfo instances for files in the
        archive."""
        return self.filelist

def printdir(self):
        """Print a table of contents for the zip file."""
        print "%-46s %19s %12s" % ("File Name", "Modified    ", "Size")
        for zinfo in self.filelist:
            date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6]
            print "%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size)

def testzip(self):
        """Read all the files and check the CRC."""
        chunk_size = 2 ** 20
        for zinfo in self.filelist:
            try:
                # Read by chunks, to avoid an OverflowError or a
                # MemoryError with very large embedded files.
                with self.open(zinfo.filename, "r") as f:
                    while f.read(chunk_size):     # Check CRC-32
                        pass
            except BadZipfile:
                return zinfo.filename

def getinfo(self, name):
        """Return the instance of ZipInfo given 'name'."""
        info = self.NameToInfo.get(name)
        if info is None:
            raise KeyError(
                'There is no item named %r in the archive' % name)

return info

def setpassword(self, pwd):
        """Set default password for encrypted files."""
        self.pwd = pwd

@property
    def comment(self):
        """The comment text associated with the ZIP file."""
        return self._comment

@comment.setter
    def comment(self, comment):
        # check for valid comment length
        if len(comment) > ZIP_MAX_COMMENT:
            import warnings
            warnings.warn('Archive comment is too long; truncating to %d bytes'
                          % ZIP_MAX_COMMENT, stacklevel=2)
            comment = comment[:ZIP_MAX_COMMENT]
        self._comment = comment
        self._didModify = True

def read(self, name, pwd=None):
        """Return file bytes (as a string) for name."""
        return self.open(name, "r", pwd).read()

def open(self, name, mode="r", pwd=None):
        """Return file-like object for 'name'."""
        if mode not in ("r", "U", "rU"):
            raise RuntimeError, 'open() requires mode "r", "U", or "rU"'
        if not self.fp:
            raise RuntimeError, \
                  "Attempt to read ZIP archive that was already closed"

# Only open a new file for instances where we were not
        # given a file object in the constructor
        if self._filePassed:
            zef_file = self.fp
            should_close = False
        else:
            zef_file = open(self.filename, 'rb')
            should_close = True

try:
            # Make sure we have an info object
            if isinstance(name, ZipInfo):
                # 'name' is already an info object
                zinfo = name
            else:
                # Get info object for name
                zinfo = self.getinfo(name)

zef_file.seek(zinfo.header_offset, 0)

# Skip the file header:
            fheader = zef_file.read(sizeFileHeader)
            if len(fheader) != sizeFileHeader:
                raise BadZipfile("Truncated file header")
            fheader = struct.unpack(structFileHeader, fheader)
            if fheader[_FH_SIGNATURE] != stringFileHeader:
                raise BadZipfile("Bad magic number for file header")

fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
            if fheader[_FH_EXTRA_FIELD_LENGTH]:
                zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])

if fname != zinfo.orig_filename:
                raise BadZipfile, \
                        'File name in directory "%s" and header "%s" differ.' % (
                            zinfo.orig_filename, fname)

# check for encrypted flag & handle password
            is_encrypted = zinfo.flag_bits & 0x1
            zd = None
            if is_encrypted:
                if not pwd:
                    pwd = self.pwd
                if not pwd:
                    raise RuntimeError, "File %s is encrypted, " \
                        "password required for extraction" % name

zd = _ZipDecrypter(pwd)
                # The first 12 bytes in the cypher stream is an encryption header
                #  used to strengthen the algorithm. The first 11 bytes are
                #  completely random, while the 12th contains the MSB of the CRC,
                #  or the MSB of the file time depending on the header type
                #  and is used to check the correctness of the password.
                bytes = zef_file.read(12)
                h = map(zd, bytes[0:12])
                if zinfo.flag_bits & 0x8:
                    # compare against the file type from extended local headers
                    check_byte = (zinfo._raw_time >> 8) & 0xff
                else:
                    # compare against the CRC otherwise
                    check_byte = (zinfo.CRC >> 24) & 0xff
                if ord(h[11]) != check_byte:
                    raise RuntimeError("Bad password for file", name)

return ZipExtFile(zef_file, mode, zinfo, zd,
                    close_fileobj=should_close)
        except:
            if should_close:
                zef_file.close()
            raise

def extract(self, member, path=None, pwd=None):
        """Extract a member from the archive to the current working directory,
           using its full name. Its file information is extracted as accurately
           as possible. `member' may be a filename or a ZipInfo object. You can
           specify a different directory using `path'.
        """
        if not isinstance(member, ZipInfo):
            member = self.getinfo(member)

if path is None:
            path = os.getcwd()

return self._extract_member(member, path, pwd)

def extractall(self, path=None, members=None, pwd=None):
        """Extract all members from the archive to the current working
           directory. `path' specifies a different directory to extract to.
           `members' is optional and must be a subset of the list returned
           by namelist().
        """
        if members is None:
            members = self.namelist()

for zipinfo in members:
            self.extract(zipinfo, path, pwd)

def _extract_member(self, member, targetpath, pwd):
        """Extract the ZipInfo object 'member' to a physical
           file on the path targetpath.
        """
        # build the destination pathname, replacing
        # forward slashes to platform specific separators.
        arcname = member.filename.replace('/', os.path.sep)

if os.path.altsep:
            arcname = arcname.replace(os.path.altsep, os.path.sep)
        # interpret absolute pathname as relative, remove drive letter or
        # UNC path, redundant separators, "." and ".." components.
        arcname = os.path.splitdrive(arcname)[1]
        arcname = os.path.sep.join(x for x in arcname.split(os.path.sep)
                    if x not in ('', os.path.curdir, os.path.pardir))
        if os.path.sep == '\\':
            # filter illegal characters on Windows
            illegal = ':<>|"?*'
            if isinstance(arcname, unicode):
                table = {ord(c): ord('_') for c in illegal}
            else:
                table = string.maketrans(illegal, '_' * len(illegal))
            arcname = arcname.translate(table)
            # remove trailing dots
            arcname = (x.rstrip('.') for x in arcname.split(os.path.sep))
            arcname = os.path.sep.join(x for x in arcname if x)

targetpath = os.path.join(targetpath, arcname)
        targetpath = os.path.normpath(targetpath)

# Create all upper directories if necessary.
        upperdirs = os.path.dirname(targetpath)
        if upperdirs and not os.path.exists(upperdirs):
            os.makedirs(upperdirs)

if member.filename[-1] == '/':
            if not os.path.isdir(targetpath):
                os.mkdir(targetpath)
            return targetpath

with self.open(member, pwd=pwd) as source, \
             file(targetpath, "wb") as target:
            shutil.copyfileobj(source, target)

return targetpath

def _writecheck(self, zinfo):
        """Check for errors before writing a file to the archive."""
        if zinfo.filename in self.NameToInfo:
            import warnings
            warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3)
        if self.mode not in ("w", "a"):
            raise RuntimeError, 'write() requires mode "w" or "a"'
        if not self.fp:
            raise RuntimeError, \
                  "Attempt to write ZIP archive that was already closed"
        if zinfo.compress_type == ZIP_DEFLATED and not zlib:
            raise RuntimeError, \
                  "Compression requires the (missing) zlib module"
        if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED):
            raise RuntimeError, \
                  "That compression method is not supported"
        if not self._allowZip64:
            requires_zip64 = None
            if len(self.filelist) >= ZIP_FILECOUNT_LIMIT:
                requires_zip64 = "Files count"
            elif zinfo.file_size > ZIP64_LIMIT:
                requires_zip64 = "Filesize"
            elif zinfo.header_offset > ZIP64_LIMIT:
                requires_zip64 = "Zipfile size"
            if requires_zip64:
                raise LargeZipFile(requires_zip64 +
                                   " would require ZIP64 extensions")

def write(self, filename, arcname=None, compress_type=None):
        """Put the bytes from filename into the archive under the name
        arcname."""
        if not self.fp:
            raise RuntimeError(
                  "Attempt to write to ZIP archive that was already closed")

st = os.stat(filename)
        isdir = stat.S_ISDIR(st.st_mode)
        mtime = time.localtime(st.st_mtime)
        date_time = mtime[0:6]
        # Create ZipInfo instance to store file information
        if arcname is None:
            arcname = filename
        arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
        while arcname[0] in (os.sep, os.altsep):
            arcname = arcname[1:]
        if isdir:
            arcname += '/'
        zinfo = ZipInfo(arcname, date_time)
        zinfo.external_attr = (st[0] & 0xFFFF) << 16L      # Unix attributes
        if isdir:
            zinfo.compress_type = ZIP_STORED
        elif compress_type is None:
            zinfo.compress_type = self.compression
        else:
            zinfo.compress_type = compress_type

zinfo.file_size = st.st_size
        zinfo.flag_bits = 0x00
        zinfo.header_offset = self.fp.tell()    # Start of header bytes

self._writecheck(zinfo)
        self._didModify = True

if isdir:
            zinfo.file_size = 0
            zinfo.compress_size = 0
            zinfo.CRC = 0
            zinfo.external_attr |= 0x10  # MS-DOS directory flag
            self.filelist.append(zinfo)
            self.NameToInfo[zinfo.filename] = zinfo
            self.fp.write(zinfo.FileHeader(False))
            return

with open(filename, "rb") as fp:
            # Must overwrite CRC and sizes with correct data later
            zinfo.CRC = CRC = 0
            zinfo.compress_size = compress_size = 0
            # Compressed size can be larger than uncompressed size
            zip64 = self._allowZip64 and \
                    zinfo.file_size * 1.05 > ZIP64_LIMIT
            self.fp.write(zinfo.FileHeader(zip64))
            if zinfo.compress_type == ZIP_DEFLATED:
                cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
                     zlib.DEFLATED, -15)
            else:
                cmpr = None
            file_size = 0
            while 1:
                buf = fp.read(1024 * 8)
                if not buf:
                    break
                file_size = file_size + len(buf)
                CRC = crc32(buf, CRC) & 0xffffffff
                if cmpr:
                    buf = cmpr.compress(buf)
                    compress_size = compress_size + len(buf)
                self.fp.write(buf)
        if cmpr:
            buf = cmpr.flush()
            compress_size = compress_size + len(buf)
            self.fp.write(buf)
            zinfo.compress_size = compress_size
        else:
            zinfo.compress_size = file_size
        zinfo.CRC = CRC
        zinfo.file_size = file_size
        if not zip64 and self._allowZip64:
            if file_size > ZIP64_LIMIT:
                raise RuntimeError('File size has increased during compressing')
            if compress_size > ZIP64_LIMIT:
                raise RuntimeError('Compressed size larger than uncompressed size')
        # Seek backwards and write file header (which will now include
        # correct CRC and file sizes)
        position = self.fp.tell()       # Preserve current position in file
        self.fp.seek(zinfo.header_offset, 0)
        self.fp.write(zinfo.FileHeader(zip64))
        self.fp.seek(position, 0)
        self.filelist.append(zinfo)
        self.NameToInfo[zinfo.filename] = zinfo

def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
        """Write a file into the archive.  The contents is the string
        'bytes'.  'zinfo_or_arcname' is either a ZipInfo instance or
        the name of the file in the archive."""
        if not isinstance(zinfo_or_arcname, ZipInfo):
            zinfo = ZipInfo(filename=zinfo_or_arcname,
                            date_time=time.localtime(time.time())[:6])

zinfo.compress_type = self.compression
            if zinfo.filename[-1] == '/':
                zinfo.external_attr = 0o40775 << 16   # drwxrwxr-x
                zinfo.external_attr |= 0x10           # MS-DOS directory flag
            else:
                zinfo.external_attr = 0o600 << 16     # ?rw-------
        else:
            zinfo = zinfo_or_arcname

if not self.fp:
            raise RuntimeError(
                  "Attempt to write to ZIP archive that was already closed")

if compress_type is not None:
            zinfo.compress_type = compress_type

zinfo.file_size = len(bytes)            # Uncompressed size
        zinfo.header_offset = self.fp.tell()    # Start of header bytes
        self._writecheck(zinfo)
        self._didModify = True
        zinfo.CRC = crc32(bytes) & 0xffffffff       # CRC-32 checksum
        if zinfo.compress_type == ZIP_DEFLATED:
            co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
                 zlib.DEFLATED, -15)
            bytes = co.compress(bytes) + co.flush()
            zinfo.compress_size = len(bytes)    # Compressed size
        else:
            zinfo.compress_size = zinfo.file_size
        zip64 = zinfo.file_size > ZIP64_LIMIT or \
                zinfo.compress_size > ZIP64_LIMIT
        if zip64 and not self._allowZip64:
            raise LargeZipFile("Filesize would require ZIP64 extensions")
        self.fp.write(zinfo.FileHeader(zip64))
        self.fp.write(bytes)
        if zinfo.flag_bits & 0x08:
            # Write CRC and file sizes after the file data
            fmt = '<LLQQ' if zip64 else '<LLLL'
            self.fp.write(struct.pack(fmt, _DD_SIGNATURE, zinfo.CRC,
                  zinfo.compress_size, zinfo.file_size))
        self.fp.flush()
        self.filelist.append(zinfo)
        self.NameToInfo[zinfo.filename] = zinfo

def __del__(self):
        """Call the "close()" method in case the user forgot."""
        self.close()

def close(self):
        """Close the file, and for mode "w" and "a" write the ending
        records."""
        if self.fp is None:
            return

try:
            if self.mode in ("w", "a") and self._didModify: # write ending records
                pos1 = self.fp.tell()
                for zinfo in self.filelist:         # write central directory
                    dt = zinfo.date_time
                    dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
                    dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
                    extra = []
                    if zinfo.file_size > ZIP64_LIMIT \
                            or zinfo.compress_size > ZIP64_LIMIT:
                        extra.append(zinfo.file_size)
                        extra.append(zinfo.compress_size)
                        file_size = 0xffffffff
                        compress_size = 0xffffffff
                    else:
                        file_size = zinfo.file_size
                        compress_size = zinfo.compress_size

if zinfo.header_offset > ZIP64_LIMIT:
                        extra.append(zinfo.header_offset)
                        header_offset = 0xffffffffL
                    else:
                        header_offset = zinfo.header_offset

extra_data = zinfo.extra
                    if extra:
                        # Append a ZIP64 field to the extra's
                        extra_data = _strip_extra(extra_data, (1,))
                        extra_data = struct.pack(
                                '<HH' + 'Q'*len(extra),
                                1, 8*len(extra), *extra) + extra_data

extract_version = max(45, zinfo.extract_version)
                        create_version = max(45, zinfo.create_version)
                    else:
                        extract_version = zinfo.extract_version
                        create_version = zinfo.create_version

try:
                        filename, flag_bits = zinfo._encodeFilenameFlags()
                        centdir = struct.pack(structCentralDir,
                        stringCentralDir, create_version,
                        zinfo.create_system, extract_version, zinfo.reserved,
                        flag_bits, zinfo.compress_type, dostime, dosdate,
                        zinfo.CRC, compress_size, file_size,
                        len(filename), len(extra_data), len(zinfo.comment),
                        0, zinfo.internal_attr, zinfo.external_attr,
                        header_offset)
                    except DeprecationWarning:
                        print >>sys.stderr, (structCentralDir,
                        stringCentralDir, create_version,
                        zinfo.create_system, extract_version, zinfo.reserved,
                        zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
                        zinfo.CRC, compress_size, file_size,
                        len(zinfo.filename), len(extra_data), len(zinfo.comment),
                        0, zinfo.internal_attr, zinfo.external_attr,
                        header_offset)
                        raise
                    self.fp.write(centdir)
                    self.fp.write(filename)
                    self.fp.write(extra_data)
                    self.fp.write(zinfo.comment)

pos2 = self.fp.tell()
                # Write end-of-zip-archive record
                centDirCount = len(self.filelist)
                centDirSize = pos2 - pos1
                centDirOffset = pos1
                requires_zip64 = None
                if centDirCount > ZIP_FILECOUNT_LIMIT:
                    requires_zip64 = "Files count"
                elif centDirOffset > ZIP64_LIMIT:
                    requires_zip64 = "Central directory offset"
                elif centDirSize > ZIP64_LIMIT:
                    requires_zip64 = "Central directory size"
                if requires_zip64:
                    # Need to write the ZIP64 end-of-archive records
                    if not self._allowZip64:
                        raise LargeZipFile(requires_zip64 +
                                           " would require ZIP64 extensions")
                    zip64endrec = struct.pack(
                            structEndArchive64, stringEndArchive64,
                            44, 45, 45, 0, 0, centDirCount, centDirCount,
                            centDirSize, centDirOffset)
                    self.fp.write(zip64endrec)

zip64locrec = struct.pack(
                            structEndArchive64Locator,
                            stringEndArchive64Locator, 0, pos2, 1)
                    self.fp.write(zip64locrec)
                    centDirCount = min(centDirCount, 0xFFFF)
                    centDirSize = min(centDirSize, 0xFFFFFFFF)
                    centDirOffset = min(centDirOffset, 0xFFFFFFFF)

endrec = struct.pack(structEndArchive, stringEndArchive,
                                    0, 0, centDirCount, centDirCount,
                                    centDirSize, centDirOffset, len(self._comment))
                self.fp.write(endrec)
                self.fp.write(self._comment)
                self.fp.flush()
        finally:
            fp = self.fp
            self.fp = None
            if not self._filePassed:
                fp.close()

class PyZipFile(ZipFile):
    """Class to create ZIP archives with Python library files and packages."""

def writepy(self, pathname, basename = ""):
        """Add all files from "pathname" to the ZIP archive.

If pathname is a package directory, search the directory and
        all package subdirectories recursively for all *.py and enter
        the modules into the archive.  If pathname is a plain
        directory, listdir *.py and enter all modules.  Else, pathname
        must be a Python *.py file and the module will be put into the
        archive.  Added modules are always module.pyo or module.pyc.
        This method will compile the module.py into module.pyc if
        necessary.
        """
        dir, name = os.path.split(pathname)
        if os.path.isdir(pathname):
            initname = os.path.join(pathname, "__init__.py")
            if os.path.isfile(initname):
                # This is a package directory, add it
                if basename:
                    basename = "%s/%s" % (basename, name)
                else:
                    basename = name
                if self.debug:
                    print "Adding package in", pathname, "as", basename
                fname, arcname = self._get_codename(initname[0:-3], basename)
                if self.debug:
                    print "Adding", arcname
                self.write(fname, arcname)
                dirlist = os.listdir(pathname)
                dirlist.remove("__init__.py")
                # Add all *.py files and package subdirectories
                for filename in dirlist:
                    path = os.path.join(pathname, filename)
                    root, ext = os.path.splitext(filename)
                    if os.path.isdir(path):
                        if os.path.isfile(os.path.join(path, "__init__.py")):
                            # This is a package directory, add it
                            self.writepy(path, basename)  # Recursive call
                    elif ext == ".py":
                        fname, arcname = self._get_codename(path[0:-3],
                                         basename)
                        if self.debug:
                            print "Adding", arcname
                        self.write(fname, arcname)
            else:
                # This is NOT a package directory, add its files at top level
                if self.debug:
                    print "Adding files from directory", pathname
                for filename in os.listdir(pathname):
                    path = os.path.join(pathname, filename)
                    root, ext = os.path.splitext(filename)
                    if ext == ".py":
                        fname, arcname = self._get_codename(path[0:-3],
                                         basename)
                        if self.debug:
                            print "Adding", arcname
                        self.write(fname, arcname)
        else:
            if pathname[-3:] != ".py":
                raise RuntimeError, \
                      'Files added with writepy() must end with ".py"'
            fname, arcname = self._get_codename(pathname[0:-3], basename)
            if self.debug:
                print "Adding file", arcname
            self.write(fname, arcname)

def _get_codename(self, pathname, basename):
        """Return (filename, archivename) for the path.

Given a module name path, return the correct file path and
        archive name, compiling if necessary.  For example, given
        /python/lib/string, return (/python/lib/string.pyc, string).
        """
        file_py  = pathname + ".py"
        file_pyc = pathname + ".pyc"
        file_pyo = pathname + ".pyo"
        if os.path.isfile(file_pyo) and \
                            os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime:
            fname = file_pyo    # Use .pyo file
        elif not os.path.isfile(file_pyc) or \
             os.stat(file_pyc).st_mtime < os.stat(file_py).st_mtime:
            import py_compile
            if self.debug:
                print "Compiling", file_py
            try:
                py_compile.compile(file_py, file_pyc, None, True)
            except py_compile.PyCompileError,err:
                print err.msg
            fname = file_pyc
        else:
            fname = file_pyc
        archivename = os.path.split(fname)[1]
        if basename:
            archivename = "%s/%s" % (basename, archivename)
        return (fname, archivename)

def main(args = None):
    import textwrap
    USAGE=textwrap.dedent("""\
        Usage:
            zipfile.py -l zipfile.zip        # Show listing of a zipfile
            zipfile.py -t zipfile.zip        # Test if a zipfile is valid
            zipfile.py -e zipfile.zip target # Extract zipfile into target dir
            zipfile.py -c zipfile.zip src ... # Create zipfile from sources
        """)
    if args is None:
        args = sys.argv[1:]

if not args or args[0] not in ('-l', '-c', '-e', '-t'):
        print USAGE
        sys.exit(1)

if args[0] == '-l':
        if len(args) != 2:
            print USAGE
            sys.exit(1)
        with ZipFile(args[1], 'r') as zf:
            zf.printdir()

elif args[0] == '-t':
        if len(args) != 2:
            print USAGE
            sys.exit(1)
        with ZipFile(args[1], 'r') as zf:
            badfile = zf.testzip()
        if badfile:
            print("The following enclosed file is corrupted: {!r}".format(badfile))
        print "Done testing"

elif args[0] == '-e':
        if len(args) != 3:
            print USAGE
            sys.exit(1)

with ZipFile(args[1], 'r') as zf:
            zf.extractall(args[2])

elif args[0] == '-c':
        if len(args) < 3:
            print USAGE
            sys.exit(1)

def addToZip(zf, path, zippath):
            if os.path.isfile(path):
                zf.write(path, zippath, ZIP_DEFLATED)
            elif os.path.isdir(path):
                if zippath:
                    zf.write(path, zippath)
                for nm in os.listdir(path):
                    addToZip(zf,
                            os.path.join(path, nm), os.path.join(zippath, nm))
            # else: ignore

with ZipFile(args[1], 'w', allowZip64=True) as zf:
            for path in args[2:]:
                zippath = os.path.basename(path)
                if not zippath:
                    zippath = os.path.basename(os.path.dirname(path))
                if zippath in ('', os.curdir, os.pardir):
                    zippath = ''
                addToZip(zf, path, zippath)

if __name__ == "__main__":
    main()

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