cpython: 2e3346fc880f Lib/zipfile.py (original) (raw)

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""" Read and write ZIP files. XXX references to utf-8 need further investigation. """ import io import os import re import imp import sys import time import stat import shutil import struct import binascii try: import zlib # We may need its compression method crc32 = zlib.crc32 except ImportError: zlib = None crc32 = binascii.crc32 all = ["BadZipFile", "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 = BadZipFile # Pre-3.2 compatibility names 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[](#l53)

(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 = b"<4s4H2LH" stringEndArchive = b"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 = b"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 = b"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 = b"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 = b"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 _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) 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, [](#l189) dircount, dircount2, dirsize, diroffset = [](#l190) 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 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(b"") 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] 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) # 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 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 = b"" # Comment for each file self.extra = b"" # 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): try: return self.filename.encode('ascii'), self.flag_bits except UnicodeEncodeError: return self.filename.encode('utf-8'), self.flag_bits | 0x800 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 (0xffffffffffffffff, 0xffffffff): self.file_size = counts[idx] idx += 1 if self.compress_size == 0xFFFFFFFF: self.compress_size = counts[idx] idx += 1 if self.header_offset == 0xffffffff: 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 ^ 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((self.key1 >> 24) & 255, self.key2) def call(self, c): """Decrypt a single character.""" assert isinstance(c, int) k = self.key2 | 2 c = c ^ (((k * (k^1)) >> 8) & 255) self._UpdateKeys(c) return c 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(br'^(?P[^\r\n]+)|(?P\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) self._unconsumed = b'' self._readbuffer = b'' 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(b'\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 = b'' while limit < 0 or len(line) < limit: readahead = self.peek(2) if readahead == b'': 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 + b'\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) 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 = b'' 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 = bytes(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().close() 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 = b'' # Check if we were passed a file-like object if isinstance(file, str): # No, it's a filename self._filePassed = 0 self.filename = file modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'} try: self.fp = io.open(file, modeDict[mode]) except IOError: if mode == 'a': mode = key = 'w' self.fp = io.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': # 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: if not self._filePassed: self.fp.close() self.fp = None raise RuntimeError('Mode must be "r", "w" or "a"') def enter(self): return self def exit(self, type, value, traceback): self.close() 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 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 = io.BytesIO(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]) flags = centdir[5] if flags & 0x800: # UTF-8 file names extension filename = filename.decode('utf-8') else: # Historical ZIP filename encoding filename = filename.decode('cp437') # 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 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, file=None): """Print a table of contents for the zip file.""" print("%-46s %19s %12s" % ("File Name", "Modified ", "Size"), file=file) 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), file=file) 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.""" if pwd and not isinstance(pwd, bytes): raise TypeError("pwd: expected bytes, got %s" % type(pwd)) if pwd: self.pwd = pwd else: self.pwd = None def read(self, name, pwd=None): """Return file bytes (as a string) for name.""" with self.open(name, "r", pwd) as fp: return fp.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 pwd and not isinstance(pwd, bytes): raise TypeError("pwd: expected bytes, got %s" % type(pwd)) 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 = io.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 try: zinfo = self.getinfo(name) except KeyError: if not self._filePassed: zef_file.close() raise 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 zinfo.flag_bits & 0x800: # UTF-8 filename fname_str = fname.decode("utf-8") else: fname_str = fname.decode("cp437") if fname_str != zinfo.orig_filename: if not self._filePassed: zef_file.close() raise BadZipFile( 'File name in directory %r and header %r 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: if not self._filePassed: zef_file.close() 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. header = zef_file.read(12) h = list(map(zd, header[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 h[11] != check_byte: if not self._filePassed: zef_file.close() raise RuntimeError("Bad password for file", name) return ZipExtFile(zef_file, mode, zinfo, zd, close_fileobj=not self._filePassed) 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[](#l983) 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.[](#l996) 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. # Strip trailing path separator, unless it represents the root. if (targetpath[-1:] in (os.path.sep, os.path.altsep) and len(os.path.splitdrive(targetpath)[1]) > 1): targetpath = targetpath[:-1] # don't include leading "/" from file name if present if member.filename[0] == '/': 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) if member.filename[-1] == '/': if not os.path.isdir(targetpath): os.mkdir(targetpath) return targetpath source = self.open(member, pwd=pwd) target = open(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) 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) << 16 # 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 if isdir: zinfo.file_size = 0 zinfo.compress_size = 0 zinfo.CRC = 0 self.filelist.append(zinfo) self.NameToInfo[zinfo.filename] = zinfo self.fp.write(zinfo.FileHeader()) 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 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) 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, data, compress_type=None): """Write a file into the archive. The contents is 'data', which may be either a 'str' or a 'bytes' instance; if it is a 'str', it is encoded as UTF-8 first. 'zinfo_or_arcname' is either a ZipInfo instance or the name of the file in the archive.""" if isinstance(data, str): data = data.encode("utf-8") 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 = 0o600 << 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(data) # Uncompressed size zinfo.header_offset = self.fp.tell() # Start of header data if compress_type is not None: zinfo.compress_type = compress_type self._writecheck(zinfo) self._didModify = True zinfo.CRC = crc32(data) & 0xffffffff # CRC-32 checksum if zinfo.compress_type == ZIP_DEFLATED: co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15) data = co.compress(data) + co.flush() zinfo.compress_size = len(data) # Compressed size else: zinfo.compress_size = zinfo.file_size zinfo.header_offset = self.fp.tell() # Start of header data self.fp.write(zinfo.FileHeader()) self.fp.write(data) 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 [](#l1212) 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 = 0xffffffff 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((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), file=sys.stderr) 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 = count centDirSize = pos2 - pos1 centDirOffset = pos1 if (centDirCount >= ZIP_FILECOUNT_LIMIT or centDirOffset > ZIP64_LIMIT or centDirSize > ZIP64_LIMIT): # Need to write the ZIP64 end-of-archive records 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) # 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' [](#l1291) % ZIP_MAX_COMMENT self.comment = self.comment[:ZIP_MAX_COMMENT] 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() 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 init(self, file, mode="r", compression=ZIP_STORED, allowZip64=False, optimize=-1): ZipFile.init(self, file, mode=mode, compression=compression, allowZip64=allowZip64) self._optimize = optimize 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). """ def _compile(file, optimize=-1): import py_compile if self.debug: print("Compiling", file) try: py_compile.compile(file, doraise=True, optimize=optimize) except py_compile.PyCompileError as error: print(err.msg) return False return True file_py = pathname + ".py" file_pyc = pathname + ".pyc" file_pyo = pathname + ".pyo" pycache_pyc = imp.cache_from_source(file_py, True) pycache_pyo = imp.cache_from_source(file_py, False) if self._optimize == -1: # legacy mode: use whatever file is present if (os.path.isfile(file_pyo) and os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime): # Use .pyo file. arcname = fname = file_pyo elif (os.path.isfile(file_pyc) and os.stat(file_pyc).st_mtime >= os.stat(file_py).st_mtime): # Use .pyc file. arcname = fname = file_pyc elif (os.path.isfile(pycache_pyc) and os.stat(pycache_pyc).st_mtime >= os.stat(file_py).st_mtime): # Use the pycache/.pyc file, but write it to the legacy pyc # file name in the archive. fname = pycache_pyc arcname = file_pyc elif (os.path.isfile(pycache_pyo) and os.stat(pycache_pyo).st_mtime >= os.stat(file_py).st_mtime): # Use the pycache/.pyo file, but write it to the legacy pyo # file name in the archive. fname = pycache_pyo arcname = file_pyo else: # Compile py into PEP 3147 pyc file. if _compile(file_py): fname = (pycache_pyc if debug else pycache_pyo) arcname = (file_pyc if debug else file_pyo) else: fname = arcname = file_py else: # new mode: use given optimization level if self._optimize == 0: fname = pycache_pyc arcname = file_pyc else: fname = pycache_pyo arcname = file_pyo if not (os.path.isfile(fname) and os.stat(fname).st_mtime >= os.stat(file_py).st_mtime): if not _compile(file_py, optimize=self._optimize): fname = arcname = file_py archivename = os.path.split(arcname)[1] if basename: archivename = "%s/%s" % (basename, archivename) return (fname, archivename) def main(args = None): import textwrap USAGE=textwrap.dedent("""[](#l1453) 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') 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) 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) with open(tgt, 'wb') as fp: fp.write(zf.read(path)) 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()