"""

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: