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Wrap

Python Source | 2011-02-15 | 51.1 KB | 1,386 lines

""" Read and write ZIP files. """ import struct, os, time, sys, shutil import binascii, cStringIO 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 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 def is_zipfile(filename): """Quickly see if file is a ZIP file by checking the magic number.""" try: fpin = open(filename, "rb") endrec = _EndRecData(fpin) fpin.close() if endrec: return True # file has correct magic number except IOError: pass return False def _EndRecData64(fpin, offset, endrec): """ Read the ZIP64 end-of-archive records and use that to update endrec """ fpin.seek(offset - sizeEndCentDir64Locator, 2) data = fpin.read(sizeEndCentDir64Locator) 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) 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). fpin.seek(-sizeEndCentDir, 2) data = fpin.read() if data[0:4] == stringEndArchive and data[-2:] == "\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) if endrec[_ECD_OFFSET] == 0xffffffff: # the value for the "offset of the start of the central directory" # indicates that there is a "Zip64 end of central directory" # structure present, so go look for it return _EndRecData64(fpin, -sizeEndCentDir, endrec) return 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] endrec = list(struct.unpack(structEndArchive, recData)) comment = data[start+sizeEndCentDir:] # check that comment length is correct if endrec[_ECD_COMMENT_SIZE] == len(comment): # Append the archive comment and start offset endrec.append(comment) endrec.append(maxCommentStart + start) if endrec[_ECD_OFFSET] == 0xffffffff: # There is apparently a "Zip64 end of central directory" # structure present, so go look for it return _EndRecData64(fpin, start - filesize, endrec) return endrec # Unable to find a valid end of central directory structure return 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 # 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): """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 file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT: # File is larger than what fits into a 4 byte integer, # fall back to the ZIP64 extension fmt = '<HHQQ' extra = extra + struct.pack(fmt, 1, struct.calcsize(fmt)-4, file_size, compress_size) 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 extra: 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 class ZipExtFile: """File-like object for reading an archive member. Is returned by ZipFile.open(). """ def __init__(self, fileobj, zipinfo, decrypt=None): self.fileobj = fileobj self.decrypter = decrypt self.bytes_read = 0L self.rawbuffer = '' self.readbuffer = '' self.linebuffer = '' self.eof = False self.univ_newlines = False self.nlSeps = ("\n", ) self.lastdiscard = '' self.compress_type = zipinfo.compress_type self.compress_size = zipinfo.compress_size self.closed = False self.mode = "r" self.name = zipinfo.filename # read from compressed files in 64k blocks self.compreadsize = 64*1024 if self.compress_type == ZIP_DEFLATED: self.dc = zlib.decompressobj(-15) def set_univ_newlines(self, univ_newlines): self.univ_newlines = univ_newlines # pick line separator char(s) based on universal newlines flag self.nlSeps = ("\n", ) if self.univ_newlines: self.nlSeps = ("\r\n", "\r", "\n") def __iter__(self): return self def next(self): nextline = self.readline() if not nextline: raise StopIteration() return nextline def close(self): self.closed = True def _checkfornewline(self): nl, nllen = -1, -1 if self.linebuffer: # ugly check for cases where half of an \r\n pair was # read on the last pass, and the \r was discarded. In this # case we just throw away the \n at the start of the buffer. if (self.lastdiscard, self.linebuffer[0]) == ('\r','\n'): self.linebuffer = self.linebuffer[1:] for sep in self.nlSeps: nl = self.linebuffer.find(sep) if nl >= 0: nllen = len(sep) return nl, nllen return nl, nllen def readline(self, size = -1): """Read a line with approx. size. If size is negative, read a whole line. """ if size < 0: size = sys.maxint elif size == 0: return '' # check for a newline already in buffer nl, nllen = self._checkfornewline() if nl >= 0: # the next line was already in the buffer nl = min(nl, size) else: # no line break in buffer - try to read more size -= len(self.linebuffer) while nl < 0 and size > 0: buf = self.read(min(size, 100)) if not buf: break self.linebuffer += buf size -= len(buf) # check for a newline in buffer nl, nllen = self._checkfornewline() # we either ran out of bytes in the file, or # met the specified size limit without finding a newline, # so return current buffer if nl < 0: s = self.linebuffer self.linebuffer = '' return s buf = self.linebuffer[:nl] self.lastdiscard = self.linebuffer[nl:nl + nllen] self.linebuffer = self.linebuffer[nl + nllen:] # line is always returned with \n as newline char (except possibly # for a final incomplete line in the file, which is handled above). return buf + "\n" def readlines(self, sizehint = -1): """Return a list with all (following) lines. The sizehint parameter is ignored in this implementation. """ result = [] while True: line = self.readline() if not line: break result.append(line) return result def read(self, size = None): # act like file() obj and return empty string if size is 0 if size == 0: return '' # determine read size bytesToRead = self.compress_size - self.bytes_read # adjust read size for encrypted files since the first 12 bytes # are for the encryption/password information if self.decrypter is not None: bytesToRead -= 12 if size is not None and size >= 0: if self.compress_type == ZIP_STORED: lr = len(self.readbuffer) bytesToRead = min(bytesToRead, size - lr) elif self.compress_type == ZIP_DEFLATED: if len(self.readbuffer) > size: # the user has requested fewer bytes than we've already # pulled through the decompressor; don't read any more bytesToRead = 0 else: # user will use up the buffer, so read some more lr = len(self.rawbuffer) bytesToRead = min(bytesToRead, self.compreadsize - lr) # avoid reading past end of file contents if bytesToRead + self.bytes_read > self.compress_size: bytesToRead = self.compress_size - self.bytes_read # try to read from file (if necessary) if bytesToRead > 0: bytes = self.fileobj.read(bytesToRead) self.bytes_read += len(bytes) self.rawbuffer += bytes # handle contents of raw buffer if self.rawbuffer: newdata = self.rawbuffer self.rawbuffer = '' # decrypt new data if we were given an object to handle that if newdata and self.decrypter is not None: newdata = ''.join(map(self.decrypter, newdata)) # decompress newly read data if necessary if newdata and self.compress_type == ZIP_DEFLATED: newdata = self.dc.decompress(newdata) self.rawbuffer = self.dc.unconsumed_tail if self.eof and len(self.rawbuffer) == 0: # we're out of raw bytes (both from the file and # the local buffer); flush just to make sure the # decompressor is done newdata += self.dc.flush() # prevent decompressor from being used again self.dc = None self.readbuffer += newdata # return what the user asked for if size is None or len(self.readbuffer) <= size: bytes = self.readbuffer self.readbuffer = '' else: bytes = self.readbuffer[:size] self.readbuffer = self.readbuffer[size:] return bytes class ZipFile: """ 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) if key == 'r': self._GetContents() elif key == 'w': pass 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) else: if not self._filePassed: self.fp.close() self.fp = None raise RuntimeError, 'Mode must be "r", "w" or "a"' def _GetContents(self): """Read the directory, making sure we close the file if the format is bad.""" try: self._RealGetContents() except BadZipfile: if not self._filePassed: self.fp.close() self.fp = None raise def _RealGetContents(self): """Read in the table of contents for the ZIP file.""" fp = self.fp endrec = _EndRecData(fp) 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 centdir[0:4] != stringCentralDir: raise BadZipfile, "Bad magic number for central directory" centdir = struct.unpack(structCentralDir, centdir) 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. f = self.open(zinfo.filename, "r") 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 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 else: zef_file = open(self.filename, 'rb') # 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 fheader[0:4] != stringFileHeader: raise BadZipfile, "Bad magic number for file header" fheader = struct.unpack(structFileHeader, fheader) 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) # build and return a ZipExtFile if zd is None: zef = ZipExtFile(zef_file, zinfo) else: zef = ZipExtFile(zef_file, zinfo, zd) # set universal newlines on ZipExtFile if necessary if "U" in mode: zef.set_univ_newlines(True) return zef 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. if targetpath[-1:] == "/": targetpath = targetpath[:-1] # don't include leading "/" from file name if present if os.path.isabs(member.filename): targetpath = os.path.join(targetpath, member.filename[1:]) else: targetpath = os.path.join(targetpath, member.filename) 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) source = self.open(member, pwd=pwd) target = file(targetpath, "wb") shutil.copyfileobj(source, target) source.close() target.close() return targetpath def _writecheck(self, zinfo): """Check for errors before writing a file to the archive.""" if zinfo.filename in self.NameToInfo: if self.debug: # Warning for duplicate names print "Duplicate name:", zinfo.filename 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 zinfo.file_size > ZIP64_LIMIT: if not self._allowZip64: raise LargeZipFile("Filesize would require ZIP64 extensions") if zinfo.header_offset > ZIP64_LIMIT: if not self._allowZip64: raise LargeZipFile("Zipfile size 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) 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:] zinfo = ZipInfo(arcname, date_time) zinfo.external_attr = (st[0] & 0xFFFF) << 16L # Unix attributes if 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 fp = open(filename, "rb") # Must overwrite CRC and sizes with correct data later zinfo.CRC = CRC = 0 zinfo.compress_size = compress_size = 0 zinfo.file_size = file_size = 0 self.fp.write(zinfo.FileHeader()) if zinfo.compress_type == ZIP_DEFLATED: cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15) else: cmpr = None 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) fp.close() 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 # Seek backwards and write CRC and file sizes position = self.fp.tell() # Preserve current position in file self.fp.seek(zinfo.header_offset + 14, 0) self.fp.write(struct.pack("<LLL", zinfo.CRC, zinfo.compress_size, zinfo.file_size)) self.fp.seek(position, 0) self.filelist.append(zinfo) self.NameToInfo[zinfo.filename] = zinfo def writestr(self, zinfo_or_arcname, bytes): """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 zinfo.external_attr = 0600 << 16 else: zinfo = zinfo_or_arcname if not self.fp: raise RuntimeError( "Attempt to write to ZIP archive that was already closed") 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 zinfo.header_offset = self.fp.tell() # Start of header bytes self.fp.write(zinfo.FileHeader()) self.fp.write(bytes) self.fp.flush() if zinfo.flag_bits & 0x08: # Write CRC and file sizes after the file data self.fp.write(struct.pack("<lLL", zinfo.CRC, zinfo.compress_size, zinfo.file_size)) 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 if self.mode in ("w", "a") and self._didModify: # write ending records count = 0 pos1 = self.fp.tell() for zinfo in self.filelist: # write central directory count = count + 1 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 = 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 centDirOffset = pos1 if pos1 > ZIP64_LIMIT: # Need to write the ZIP64 end-of-archive records zip64endrec = struct.pack( structEndArchive64, stringEndArchive64, 44, 45, 45, 0, 0, count, count, pos2 - pos1, pos1) self.fp.write(zip64endrec) zip64locrec = struct.pack( structEndArchive64Locator, stringEndArchive64Locator, 0, pos2, 1) self.fp.write(zip64locrec) centDirOffset = 0xFFFFFFFF # check for valid comment length if len(self.comment) >= ZIP_MAX_COMMENT: if self.debug > 0: msg = 'Archive comment is too long; truncating to %d bytes' \ % ZIP_MAX_COMMENT self.comment = self.comment[:ZIP_MAX_COMMENT] endrec = struct.pack(structEndArchive, stringEndArchive, 0, 0, count % ZIP_FILECOUNT_LIMIT, count % ZIP_FILECOUNT_LIMIT, pos2 - pos1, centDirOffset, len(self.comment)) self.fp.write(endrec) self.fp.write(self.comment) self.fp.flush() if not self._filePassed: self.fp.close() self.fp = None 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) zf = ZipFile(args[1], 'r') zf.printdir() zf.close() elif args[0] == '-t': if len(args) != 2: print USAGE sys.exit(1) zf = ZipFile(args[1], 'r') zf.testzip() print "Done testing" elif args[0] == '-e': if len(args) != 3: print USAGE sys.exit(1) zf = ZipFile(args[1], 'r') out = args[2] for path in zf.namelist(): if path.startswith('./'): tgt = os.path.join(out, path[2:]) else: tgt = os.path.join(out, path) tgtdir = os.path.dirname(tgt) if not os.path.exists(tgtdir): os.makedirs(tgtdir) fp = open(tgt, 'wb') fp.write(zf.read(path)) fp.close() zf.close() 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): for nm in os.listdir(path): addToZip(zf, os.path.join(path, nm), os.path.join(zippath, nm)) # else: ignore zf = ZipFile(args[1], 'w', allowZip64=True) for src in args[2:]: addToZip(zf, src, os.path.basename(src)) zf.close() if __name__ == "__main__": main()