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0af8a86be8
directory that are too short to be parsed instead of letting a struct.unpack error bubble up as this "bad data" appears in many real world zip files in the wild and is ignored by other zip tools.
1800 lines
66 KiB
Python
1800 lines
66 KiB
Python
"""
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Read and write ZIP files.
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XXX references to utf-8 need further investigation.
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"""
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import io
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import os
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import re
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import importlib.util
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import sys
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import time
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import stat
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import shutil
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import struct
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import binascii
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try:
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import zlib # We may need its compression method
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crc32 = zlib.crc32
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except ImportError:
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zlib = None
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crc32 = binascii.crc32
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try:
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import bz2 # We may need its compression method
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except ImportError:
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bz2 = None
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try:
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import lzma # We may need its compression method
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except ImportError:
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lzma = None
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__all__ = ["BadZipFile", "BadZipfile", "error",
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"ZIP_STORED", "ZIP_DEFLATED", "ZIP_BZIP2", "ZIP_LZMA",
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"is_zipfile", "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile"]
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class BadZipFile(Exception):
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pass
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class LargeZipFile(Exception):
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"""
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Raised when writing a zipfile, the zipfile requires ZIP64 extensions
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and those extensions are disabled.
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"""
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error = BadZipfile = BadZipFile # Pre-3.2 compatibility names
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ZIP64_LIMIT = (1 << 31) - 1
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ZIP_FILECOUNT_LIMIT = 1 << 16
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ZIP_MAX_COMMENT = (1 << 16) - 1
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# constants for Zip file compression methods
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ZIP_STORED = 0
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ZIP_DEFLATED = 8
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ZIP_BZIP2 = 12
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ZIP_LZMA = 14
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# Other ZIP compression methods not supported
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DEFAULT_VERSION = 20
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ZIP64_VERSION = 45
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BZIP2_VERSION = 46
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LZMA_VERSION = 63
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# we recognize (but not necessarily support) all features up to that version
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MAX_EXTRACT_VERSION = 63
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# Below are some formats and associated data for reading/writing headers using
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# the struct module. The names and structures of headers/records are those used
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# in the PKWARE description of the ZIP file format:
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# http://www.pkware.com/documents/casestudies/APPNOTE.TXT
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# (URL valid as of January 2008)
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# The "end of central directory" structure, magic number, size, and indices
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# (section V.I in the format document)
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structEndArchive = b"<4s4H2LH"
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stringEndArchive = b"PK\005\006"
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sizeEndCentDir = struct.calcsize(structEndArchive)
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_ECD_SIGNATURE = 0
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_ECD_DISK_NUMBER = 1
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_ECD_DISK_START = 2
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_ECD_ENTRIES_THIS_DISK = 3
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_ECD_ENTRIES_TOTAL = 4
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_ECD_SIZE = 5
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_ECD_OFFSET = 6
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_ECD_COMMENT_SIZE = 7
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# These last two indices are not part of the structure as defined in the
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# spec, but they are used internally by this module as a convenience
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_ECD_COMMENT = 8
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_ECD_LOCATION = 9
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# The "central directory" structure, magic number, size, and indices
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# of entries in the structure (section V.F in the format document)
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structCentralDir = "<4s4B4HL2L5H2L"
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stringCentralDir = b"PK\001\002"
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sizeCentralDir = struct.calcsize(structCentralDir)
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# indexes of entries in the central directory structure
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_CD_SIGNATURE = 0
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_CD_CREATE_VERSION = 1
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_CD_CREATE_SYSTEM = 2
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_CD_EXTRACT_VERSION = 3
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_CD_EXTRACT_SYSTEM = 4
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_CD_FLAG_BITS = 5
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_CD_COMPRESS_TYPE = 6
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_CD_TIME = 7
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_CD_DATE = 8
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_CD_CRC = 9
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_CD_COMPRESSED_SIZE = 10
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_CD_UNCOMPRESSED_SIZE = 11
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_CD_FILENAME_LENGTH = 12
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_CD_EXTRA_FIELD_LENGTH = 13
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_CD_COMMENT_LENGTH = 14
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_CD_DISK_NUMBER_START = 15
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_CD_INTERNAL_FILE_ATTRIBUTES = 16
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_CD_EXTERNAL_FILE_ATTRIBUTES = 17
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_CD_LOCAL_HEADER_OFFSET = 18
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# The "local file header" structure, magic number, size, and indices
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# (section V.A in the format document)
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structFileHeader = "<4s2B4HL2L2H"
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stringFileHeader = b"PK\003\004"
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sizeFileHeader = struct.calcsize(structFileHeader)
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_FH_SIGNATURE = 0
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_FH_EXTRACT_VERSION = 1
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_FH_EXTRACT_SYSTEM = 2
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_FH_GENERAL_PURPOSE_FLAG_BITS = 3
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_FH_COMPRESSION_METHOD = 4
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_FH_LAST_MOD_TIME = 5
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_FH_LAST_MOD_DATE = 6
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_FH_CRC = 7
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_FH_COMPRESSED_SIZE = 8
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_FH_UNCOMPRESSED_SIZE = 9
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_FH_FILENAME_LENGTH = 10
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_FH_EXTRA_FIELD_LENGTH = 11
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# The "Zip64 end of central directory locator" structure, magic number, and size
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structEndArchive64Locator = "<4sLQL"
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stringEndArchive64Locator = b"PK\x06\x07"
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sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator)
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# The "Zip64 end of central directory" record, magic number, size, and indices
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# (section V.G in the format document)
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structEndArchive64 = "<4sQ2H2L4Q"
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stringEndArchive64 = b"PK\x06\x06"
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sizeEndCentDir64 = struct.calcsize(structEndArchive64)
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_CD64_SIGNATURE = 0
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_CD64_DIRECTORY_RECSIZE = 1
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_CD64_CREATE_VERSION = 2
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_CD64_EXTRACT_VERSION = 3
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_CD64_DISK_NUMBER = 4
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_CD64_DISK_NUMBER_START = 5
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_CD64_NUMBER_ENTRIES_THIS_DISK = 6
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_CD64_NUMBER_ENTRIES_TOTAL = 7
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_CD64_DIRECTORY_SIZE = 8
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_CD64_OFFSET_START_CENTDIR = 9
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def _check_zipfile(fp):
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try:
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if _EndRecData(fp):
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return True # file has correct magic number
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except OSError:
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pass
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return False
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def is_zipfile(filename):
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"""Quickly see if a file is a ZIP file by checking the magic number.
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The filename argument may be a file or file-like object too.
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"""
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result = False
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try:
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if hasattr(filename, "read"):
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result = _check_zipfile(fp=filename)
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else:
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with open(filename, "rb") as fp:
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result = _check_zipfile(fp)
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except OSError:
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pass
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return result
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def _EndRecData64(fpin, offset, endrec):
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"""
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Read the ZIP64 end-of-archive records and use that to update endrec
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"""
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try:
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fpin.seek(offset - sizeEndCentDir64Locator, 2)
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except OSError:
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# If the seek fails, the file is not large enough to contain a ZIP64
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# end-of-archive record, so just return the end record we were given.
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return endrec
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data = fpin.read(sizeEndCentDir64Locator)
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if len(data) != sizeEndCentDir64Locator:
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return endrec
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sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data)
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if sig != stringEndArchive64Locator:
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return endrec
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if diskno != 0 or disks != 1:
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raise BadZipFile("zipfiles that span multiple disks are not supported")
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# Assume no 'zip64 extensible data'
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fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2)
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data = fpin.read(sizeEndCentDir64)
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if len(data) != sizeEndCentDir64:
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return endrec
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sig, sz, create_version, read_version, disk_num, disk_dir, \
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dircount, dircount2, dirsize, diroffset = \
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struct.unpack(structEndArchive64, data)
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if sig != stringEndArchive64:
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return endrec
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# Update the original endrec using data from the ZIP64 record
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endrec[_ECD_SIGNATURE] = sig
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endrec[_ECD_DISK_NUMBER] = disk_num
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endrec[_ECD_DISK_START] = disk_dir
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endrec[_ECD_ENTRIES_THIS_DISK] = dircount
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endrec[_ECD_ENTRIES_TOTAL] = dircount2
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endrec[_ECD_SIZE] = dirsize
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endrec[_ECD_OFFSET] = diroffset
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return endrec
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def _EndRecData(fpin):
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"""Return data from the "End of Central Directory" record, or None.
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The data is a list of the nine items in the ZIP "End of central dir"
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record followed by a tenth item, the file seek offset of this record."""
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# Determine file size
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fpin.seek(0, 2)
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filesize = fpin.tell()
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# Check to see if this is ZIP file with no archive comment (the
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# "end of central directory" structure should be the last item in the
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# file if this is the case).
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try:
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fpin.seek(-sizeEndCentDir, 2)
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except OSError:
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return None
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data = fpin.read()
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if (len(data) == sizeEndCentDir and
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data[0:4] == stringEndArchive and
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data[-2:] == b"\000\000"):
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# the signature is correct and there's no comment, unpack structure
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endrec = struct.unpack(structEndArchive, data)
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endrec=list(endrec)
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# Append a blank comment and record start offset
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endrec.append(b"")
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endrec.append(filesize - sizeEndCentDir)
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# Try to read the "Zip64 end of central directory" structure
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return _EndRecData64(fpin, -sizeEndCentDir, endrec)
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# Either this is not a ZIP file, or it is a ZIP file with an archive
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# comment. Search the end of the file for the "end of central directory"
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# record signature. The comment is the last item in the ZIP file and may be
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# up to 64K long. It is assumed that the "end of central directory" magic
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# number does not appear in the comment.
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maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0)
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fpin.seek(maxCommentStart, 0)
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data = fpin.read()
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start = data.rfind(stringEndArchive)
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if start >= 0:
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# found the magic number; attempt to unpack and interpret
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recData = data[start:start+sizeEndCentDir]
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if len(recData) != sizeEndCentDir:
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# Zip file is corrupted.
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return None
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endrec = list(struct.unpack(structEndArchive, recData))
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commentSize = endrec[_ECD_COMMENT_SIZE] #as claimed by the zip file
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comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize]
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endrec.append(comment)
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endrec.append(maxCommentStart + start)
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# Try to read the "Zip64 end of central directory" structure
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return _EndRecData64(fpin, maxCommentStart + start - filesize,
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endrec)
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# Unable to find a valid end of central directory structure
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return None
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class ZipInfo (object):
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"""Class with attributes describing each file in the ZIP archive."""
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__slots__ = (
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'orig_filename',
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'filename',
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'date_time',
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'compress_type',
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'comment',
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'extra',
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'create_system',
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'create_version',
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'extract_version',
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'reserved',
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'flag_bits',
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'volume',
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'internal_attr',
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'external_attr',
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'header_offset',
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'CRC',
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'compress_size',
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'file_size',
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'_raw_time',
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)
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def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
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self.orig_filename = filename # Original file name in archive
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# Terminate the file name at the first null byte. Null bytes in file
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# names are used as tricks by viruses in archives.
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null_byte = filename.find(chr(0))
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if null_byte >= 0:
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filename = filename[0:null_byte]
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# This is used to ensure paths in generated ZIP files always use
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# forward slashes as the directory separator, as required by the
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# ZIP format specification.
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if os.sep != "/" and os.sep in filename:
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filename = filename.replace(os.sep, "/")
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self.filename = filename # Normalized file name
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self.date_time = date_time # year, month, day, hour, min, sec
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if date_time[0] < 1980:
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raise ValueError('ZIP does not support timestamps before 1980')
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# Standard values:
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self.compress_type = ZIP_STORED # Type of compression for the file
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self.comment = b"" # Comment for each file
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self.extra = b"" # ZIP extra data
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if sys.platform == 'win32':
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self.create_system = 0 # System which created ZIP archive
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else:
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# Assume everything else is unix-y
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self.create_system = 3 # System which created ZIP archive
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self.create_version = DEFAULT_VERSION # Version which created ZIP archive
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self.extract_version = DEFAULT_VERSION # Version needed to extract archive
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self.reserved = 0 # Must be zero
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self.flag_bits = 0 # ZIP flag bits
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self.volume = 0 # Volume number of file header
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self.internal_attr = 0 # Internal attributes
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self.external_attr = 0 # External file attributes
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# Other attributes are set by class ZipFile:
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# header_offset Byte offset to the file header
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# CRC CRC-32 of the uncompressed file
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# compress_size Size of the compressed file
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# file_size Size of the uncompressed file
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def FileHeader(self, zip64=None):
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"""Return the per-file header as a string."""
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dt = self.date_time
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dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
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dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
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if self.flag_bits & 0x08:
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# Set these to zero because we write them after the file data
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CRC = compress_size = file_size = 0
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else:
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CRC = self.CRC
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compress_size = self.compress_size
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file_size = self.file_size
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extra = self.extra
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min_version = 0
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if zip64 is None:
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zip64 = file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT
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if zip64:
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fmt = '<HHQQ'
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extra = extra + struct.pack(fmt,
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1, struct.calcsize(fmt)-4, file_size, compress_size)
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if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
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if not zip64:
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raise LargeZipFile("Filesize would require ZIP64 extensions")
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# File is larger than what fits into a 4 byte integer,
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# fall back to the ZIP64 extension
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file_size = 0xffffffff
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compress_size = 0xffffffff
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min_version = ZIP64_VERSION
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if self.compress_type == ZIP_BZIP2:
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min_version = max(BZIP2_VERSION, min_version)
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elif self.compress_type == ZIP_LZMA:
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min_version = max(LZMA_VERSION, min_version)
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self.extract_version = max(min_version, self.extract_version)
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self.create_version = max(min_version, self.create_version)
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filename, flag_bits = self._encodeFilenameFlags()
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header = struct.pack(structFileHeader, stringFileHeader,
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self.extract_version, self.reserved, flag_bits,
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self.compress_type, dostime, dosdate, CRC,
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compress_size, file_size,
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len(filename), len(extra))
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return header + filename + extra
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def _encodeFilenameFlags(self):
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try:
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return self.filename.encode('ascii'), self.flag_bits
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except UnicodeEncodeError:
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return self.filename.encode('utf-8'), self.flag_bits | 0x800
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def _decodeExtra(self):
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# Try to decode the extra field.
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extra = self.extra
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unpack = struct.unpack
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while len(extra) >= 4:
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tp, ln = unpack('<HH', extra[:4])
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if tp == 1:
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if ln >= 24:
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counts = unpack('<QQQ', extra[4:28])
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elif ln == 16:
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counts = unpack('<QQ', extra[4:20])
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elif ln == 8:
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counts = unpack('<Q', extra[4:12])
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elif ln == 0:
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counts = ()
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else:
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raise RuntimeError("Corrupt extra field %s"%(ln,))
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idx = 0
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# ZIP64 extension (large files and/or large archives)
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if self.file_size in (0xffffffffffffffff, 0xffffffff):
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self.file_size = counts[idx]
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idx += 1
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if self.compress_size == 0xFFFFFFFF:
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self.compress_size = counts[idx]
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idx += 1
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if self.header_offset == 0xffffffff:
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old = self.header_offset
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self.header_offset = counts[idx]
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idx+=1
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extra = extra[ln+4:]
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class _ZipDecrypter:
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"""Class to handle decryption of files stored within a ZIP archive.
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ZIP supports a password-based form of encryption. Even though known
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plaintext attacks have been found against it, it is still useful
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to be able to get data out of such a file.
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Usage:
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zd = _ZipDecrypter(mypwd)
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plain_char = zd(cypher_char)
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plain_text = map(zd, cypher_text)
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"""
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def _GenerateCRCTable():
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"""Generate a CRC-32 table.
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ZIP encryption uses the CRC32 one-byte primitive for scrambling some
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internal keys. We noticed that a direct implementation is faster than
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relying on binascii.crc32().
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"""
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poly = 0xedb88320
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table = [0] * 256
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for i in range(256):
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crc = i
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for j in range(8):
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if crc & 1:
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crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly
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else:
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crc = ((crc >> 1) & 0x7FFFFFFF)
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table[i] = crc
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return table
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crctable = None
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def _crc32(self, ch, crc):
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"""Compute the CRC32 primitive on one byte."""
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return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ch) & 0xff]
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def __init__(self, pwd):
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if _ZipDecrypter.crctable is None:
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_ZipDecrypter.crctable = _ZipDecrypter._GenerateCRCTable()
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self.key0 = 305419896
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self.key1 = 591751049
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self.key2 = 878082192
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for p in pwd:
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self._UpdateKeys(p)
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def _UpdateKeys(self, c):
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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 LZMACompressor:
|
|
|
|
def __init__(self):
|
|
self._comp = None
|
|
|
|
def _init(self):
|
|
props = lzma._encode_filter_properties({'id': lzma.FILTER_LZMA1})
|
|
self._comp = lzma.LZMACompressor(lzma.FORMAT_RAW, filters=[
|
|
lzma._decode_filter_properties(lzma.FILTER_LZMA1, props)
|
|
])
|
|
return struct.pack('<BBH', 9, 4, len(props)) + props
|
|
|
|
def compress(self, data):
|
|
if self._comp is None:
|
|
return self._init() + self._comp.compress(data)
|
|
return self._comp.compress(data)
|
|
|
|
def flush(self):
|
|
if self._comp is None:
|
|
return self._init() + self._comp.flush()
|
|
return self._comp.flush()
|
|
|
|
|
|
class LZMADecompressor:
|
|
|
|
def __init__(self):
|
|
self._decomp = None
|
|
self._unconsumed = b''
|
|
self.eof = False
|
|
|
|
def decompress(self, data):
|
|
if self._decomp is None:
|
|
self._unconsumed += data
|
|
if len(self._unconsumed) <= 4:
|
|
return b''
|
|
psize, = struct.unpack('<H', self._unconsumed[2:4])
|
|
if len(self._unconsumed) <= 4 + psize:
|
|
return b''
|
|
|
|
self._decomp = lzma.LZMADecompressor(lzma.FORMAT_RAW, filters=[
|
|
lzma._decode_filter_properties(lzma.FILTER_LZMA1,
|
|
self._unconsumed[4:4 + psize])
|
|
])
|
|
data = self._unconsumed[4 + psize:]
|
|
del self._unconsumed
|
|
|
|
result = self._decomp.decompress(data)
|
|
self.eof = self._decomp.eof
|
|
return result
|
|
|
|
|
|
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',
|
|
}
|
|
|
|
def _check_compression(compression):
|
|
if compression == ZIP_STORED:
|
|
pass
|
|
elif compression == ZIP_DEFLATED:
|
|
if not zlib:
|
|
raise RuntimeError(
|
|
"Compression requires the (missing) zlib module")
|
|
elif compression == ZIP_BZIP2:
|
|
if not bz2:
|
|
raise RuntimeError(
|
|
"Compression requires the (missing) bz2 module")
|
|
elif compression == ZIP_LZMA:
|
|
if not lzma:
|
|
raise RuntimeError(
|
|
"Compression requires the (missing) lzma module")
|
|
else:
|
|
raise RuntimeError("That compression method is not supported")
|
|
|
|
|
|
def _get_compressor(compress_type):
|
|
if compress_type == ZIP_DEFLATED:
|
|
return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
|
|
zlib.DEFLATED, -15)
|
|
elif compress_type == ZIP_BZIP2:
|
|
return bz2.BZ2Compressor()
|
|
elif compress_type == ZIP_LZMA:
|
|
return LZMACompressor()
|
|
else:
|
|
return None
|
|
|
|
|
|
def _get_decompressor(compress_type):
|
|
if compress_type == ZIP_STORED:
|
|
return None
|
|
elif compress_type == ZIP_DEFLATED:
|
|
return zlib.decompressobj(-15)
|
|
elif compress_type == ZIP_BZIP2:
|
|
return bz2.BZ2Decompressor()
|
|
elif compress_type == ZIP_LZMA:
|
|
return LZMADecompressor()
|
|
else:
|
|
descr = compressor_names.get(compress_type)
|
|
if descr:
|
|
raise NotImplementedError("compression type %d (%s)" % (compress_type, descr))
|
|
else:
|
|
raise NotImplementedError("compression type %d" % (compress_type,))
|
|
|
|
|
|
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<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_left = zipinfo.compress_size
|
|
self._left = zipinfo.file_size
|
|
|
|
self._decompressor = _get_decompressor(self._compress_type)
|
|
|
|
self._eof = False
|
|
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)
|
|
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..
|
|
"""
|
|
if n is None or n < 0:
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
while not self._eof:
|
|
buf += self._read1(self.MAX_N)
|
|
return buf
|
|
|
|
end = n + self._offset
|
|
if end < len(self._readbuffer):
|
|
buf = self._readbuffer[self._offset:end]
|
|
self._offset = end
|
|
return buf
|
|
|
|
n = end - len(self._readbuffer)
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
while n > 0 and not self._eof:
|
|
data = self._read1(n)
|
|
if n < len(data):
|
|
self._readbuffer = data
|
|
self._offset = n
|
|
buf += data[:n]
|
|
break
|
|
buf += data
|
|
n -= len(data)
|
|
return buf
|
|
|
|
def _update_crc(self, newdata):
|
|
# 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 self._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."""
|
|
|
|
if n is None or n < 0:
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
while not self._eof:
|
|
data = self._read1(self.MAX_N)
|
|
if data:
|
|
buf += data
|
|
break
|
|
return buf
|
|
|
|
end = n + self._offset
|
|
if end < len(self._readbuffer):
|
|
buf = self._readbuffer[self._offset:end]
|
|
self._offset = end
|
|
return buf
|
|
|
|
n = end - len(self._readbuffer)
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
if n > 0:
|
|
while not self._eof:
|
|
data = self._read1(n)
|
|
if n < len(data):
|
|
self._readbuffer = data
|
|
self._offset = n
|
|
buf += data[:n]
|
|
break
|
|
if data:
|
|
buf += data
|
|
break
|
|
return buf
|
|
|
|
def _read1(self, n):
|
|
# Read up to n compressed bytes with at most one read() system call,
|
|
# decrypt and decompress them.
|
|
if self._eof or n <= 0:
|
|
return b''
|
|
|
|
# Read from file.
|
|
if self._compress_type == ZIP_DEFLATED:
|
|
## Handle unconsumed data.
|
|
data = self._decompressor.unconsumed_tail
|
|
if n > len(data):
|
|
data += self._read2(n - len(data))
|
|
else:
|
|
data = self._read2(n)
|
|
|
|
if self._compress_type == ZIP_STORED:
|
|
self._eof = self._compress_left <= 0
|
|
elif self._compress_type == ZIP_DEFLATED:
|
|
n = max(n, self.MIN_READ_SIZE)
|
|
data = self._decompressor.decompress(data, n)
|
|
self._eof = (self._decompressor.eof or
|
|
self._compress_left <= 0 and
|
|
not self._decompressor.unconsumed_tail)
|
|
if self._eof:
|
|
data += self._decompressor.flush()
|
|
else:
|
|
data = self._decompressor.decompress(data)
|
|
self._eof = self._decompressor.eof or self._compress_left <= 0
|
|
|
|
data = data[:self._left]
|
|
self._left -= len(data)
|
|
if self._left <= 0:
|
|
self._eof = True
|
|
self._update_crc(data)
|
|
return data
|
|
|
|
def _read2(self, n):
|
|
if self._compress_left <= 0:
|
|
return b''
|
|
|
|
n = max(n, self.MIN_READ_SIZE)
|
|
n = min(n, self._compress_left)
|
|
|
|
data = self._fileobj.read(n)
|
|
self._compress_left -= len(data)
|
|
if not data:
|
|
raise EOFError
|
|
|
|
if self._decrypter is not None:
|
|
data = bytes(map(self._decrypter, 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=True)
|
|
|
|
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), ZIP_DEFLATED (requires zlib),
|
|
ZIP_BZIP2 (requires bz2) or ZIP_LZMA (requires lzma).
|
|
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
|
|
_windows_illegal_name_trans_table = None
|
|
|
|
def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=True):
|
|
"""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"')
|
|
|
|
_check_compression(compression)
|
|
|
|
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 OSError:
|
|
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)
|
|
|
|
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 OSError:
|
|
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 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])
|
|
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]
|
|
if x.extract_version > MAX_EXTRACT_VERSION:
|
|
raise NotImplementedError("zip file version %.1f" %
|
|
(x.extract_version / 10))
|
|
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."""
|
|
return [data.filename for data in self.filelist]
|
|
|
|
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.
|
|
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."""
|
|
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
|
|
|
|
@property
|
|
def comment(self):
|
|
"""The comment text associated with the ZIP file."""
|
|
return self._comment
|
|
|
|
@comment.setter
|
|
def comment(self, comment):
|
|
if not isinstance(comment, bytes):
|
|
raise TypeError("comment: expected bytes, got %s" % type(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."""
|
|
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 'U' in mode:
|
|
import warnings
|
|
warnings.warn("'U' mode is deprecated",
|
|
DeprecationWarning, 2)
|
|
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')
|
|
|
|
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 zinfo.flag_bits & 0x20:
|
|
# Zip 2.7: compressed patched data
|
|
raise NotImplementedError("compressed patched data (flag bit 5)")
|
|
|
|
if zinfo.flag_bits & 0x40:
|
|
# strong encryption
|
|
raise NotImplementedError("strong encryption (flag bit 6)")
|
|
|
|
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:
|
|
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:
|
|
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:
|
|
raise RuntimeError("Bad password for file", name)
|
|
|
|
return ZipExtFile(zef_file, mode, zinfo, zd,
|
|
close_fileobj=not self._filePassed)
|
|
except:
|
|
if not self._filePassed:
|
|
zef_file.close()
|
|
raise
|
|
|
|
def extract(self, member, path=None, pwd=None):
|
|
"""Extract a member from the archive to the current working directory,
|
|
using its full name. Its file information is extracted as accurately
|
|
as possible. `member' may be a filename or a ZipInfo object. You can
|
|
specify a different directory using `path'.
|
|
"""
|
|
if not isinstance(member, ZipInfo):
|
|
member = self.getinfo(member)
|
|
|
|
if path is None:
|
|
path = os.getcwd()
|
|
|
|
return self._extract_member(member, path, pwd)
|
|
|
|
def extractall(self, path=None, members=None, pwd=None):
|
|
"""Extract all members from the archive to the current working
|
|
directory. `path' specifies a different directory to extract to.
|
|
`members' is optional and must be a subset of the list returned
|
|
by namelist().
|
|
"""
|
|
if members is None:
|
|
members = self.namelist()
|
|
|
|
for zipinfo in members:
|
|
self.extract(zipinfo, path, pwd)
|
|
|
|
@classmethod
|
|
def _sanitize_windows_name(cls, arcname, pathsep):
|
|
"""Replace bad characters and remove trailing dots from parts."""
|
|
table = cls._windows_illegal_name_trans_table
|
|
if not table:
|
|
illegal = ':<>|"?*'
|
|
table = str.maketrans(illegal, '_' * len(illegal))
|
|
cls._windows_illegal_name_trans_table = table
|
|
arcname = arcname.translate(table)
|
|
# remove trailing dots
|
|
arcname = (x.rstrip('.') for x in arcname.split(pathsep))
|
|
# rejoin, removing empty parts.
|
|
arcname = pathsep.join(x for x in arcname if x)
|
|
return arcname
|
|
|
|
def _extract_member(self, member, targetpath, pwd):
|
|
"""Extract the ZipInfo object 'member' to a physical
|
|
file on the path targetpath.
|
|
"""
|
|
# build the destination pathname, replacing
|
|
# forward slashes to platform specific separators.
|
|
arcname = member.filename.replace('/', os.path.sep)
|
|
|
|
if os.path.altsep:
|
|
arcname = arcname.replace(os.path.altsep, os.path.sep)
|
|
# interpret absolute pathname as relative, remove drive letter or
|
|
# UNC path, redundant separators, "." and ".." components.
|
|
arcname = os.path.splitdrive(arcname)[1]
|
|
invalid_path_parts = ('', os.path.curdir, os.path.pardir)
|
|
arcname = os.path.sep.join(x for x in arcname.split(os.path.sep)
|
|
if x not in invalid_path_parts)
|
|
if os.path.sep == '\\':
|
|
# filter illegal characters on Windows
|
|
arcname = self._sanitize_windows_name(arcname, os.path.sep)
|
|
|
|
targetpath = os.path.join(targetpath, arcname)
|
|
targetpath = os.path.normpath(targetpath)
|
|
|
|
# Create all upper directories if necessary.
|
|
upperdirs = os.path.dirname(targetpath)
|
|
if upperdirs and not os.path.exists(upperdirs):
|
|
os.makedirs(upperdirs)
|
|
|
|
if member.filename[-1] == '/':
|
|
if not os.path.isdir(targetpath):
|
|
os.mkdir(targetpath)
|
|
return targetpath
|
|
|
|
with self.open(member, pwd=pwd) as source, \
|
|
open(targetpath, "wb") as target:
|
|
shutil.copyfileobj(source, target)
|
|
|
|
return targetpath
|
|
|
|
def _writecheck(self, zinfo):
|
|
"""Check for errors before writing a file to the archive."""
|
|
if zinfo.filename in self.NameToInfo:
|
|
import warnings
|
|
warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3)
|
|
if self.mode not in ("w", "a"):
|
|
raise RuntimeError('write() requires mode "w" or "a"')
|
|
if not self.fp:
|
|
raise RuntimeError(
|
|
"Attempt to write ZIP archive that was already closed")
|
|
_check_compression(zinfo.compress_type)
|
|
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
|
|
if zinfo.compress_type == ZIP_LZMA:
|
|
# Compressed data includes an end-of-stream (EOS) marker
|
|
zinfo.flag_bits |= 0x02
|
|
|
|
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(False))
|
|
return
|
|
|
|
cmpr = _get_compressor(zinfo.compress_type)
|
|
with open(filename, "rb") as fp:
|
|
# Must overwrite CRC and sizes with correct data later
|
|
zinfo.CRC = CRC = 0
|
|
zinfo.compress_size = compress_size = 0
|
|
# Compressed size can be larger than uncompressed size
|
|
zip64 = self._allowZip64 and \
|
|
zinfo.file_size * 1.05 > ZIP64_LIMIT
|
|
self.fp.write(zinfo.FileHeader(zip64))
|
|
file_size = 0
|
|
while 1:
|
|
buf = fp.read(1024 * 8)
|
|
if not buf:
|
|
break
|
|
file_size = file_size + len(buf)
|
|
CRC = crc32(buf, CRC) & 0xffffffff
|
|
if cmpr:
|
|
buf = cmpr.compress(buf)
|
|
compress_size = compress_size + len(buf)
|
|
self.fp.write(buf)
|
|
if cmpr:
|
|
buf = cmpr.flush()
|
|
compress_size = compress_size + len(buf)
|
|
self.fp.write(buf)
|
|
zinfo.compress_size = compress_size
|
|
else:
|
|
zinfo.compress_size = file_size
|
|
zinfo.CRC = CRC
|
|
zinfo.file_size = file_size
|
|
if not zip64 and self._allowZip64:
|
|
if file_size > ZIP64_LIMIT:
|
|
raise RuntimeError('File size has increased during compressing')
|
|
if compress_size > ZIP64_LIMIT:
|
|
raise RuntimeError('Compressed size larger than uncompressed size')
|
|
# Seek backwards and write file header (which will now include
|
|
# correct CRC and file sizes)
|
|
position = self.fp.tell() # Preserve current position in file
|
|
self.fp.seek(zinfo.header_offset, 0)
|
|
self.fp.write(zinfo.FileHeader(zip64))
|
|
self.fp.seek(position, 0)
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
|
|
def writestr(self, zinfo_or_arcname, 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
|
|
if zinfo.compress_type == ZIP_LZMA:
|
|
# Compressed data includes an end-of-stream (EOS) marker
|
|
zinfo.flag_bits |= 0x02
|
|
|
|
self._writecheck(zinfo)
|
|
self._didModify = True
|
|
zinfo.CRC = crc32(data) & 0xffffffff # CRC-32 checksum
|
|
co = _get_compressor(zinfo.compress_type)
|
|
if co:
|
|
data = co.compress(data) + co.flush()
|
|
zinfo.compress_size = len(data) # Compressed size
|
|
else:
|
|
zinfo.compress_size = zinfo.file_size
|
|
zip64 = zinfo.file_size > ZIP64_LIMIT or \
|
|
zinfo.compress_size > ZIP64_LIMIT
|
|
if zip64 and not self._allowZip64:
|
|
raise LargeZipFile("Filesize would require ZIP64 extensions")
|
|
self.fp.write(zinfo.FileHeader(zip64))
|
|
self.fp.write(data)
|
|
if zinfo.flag_bits & 0x08:
|
|
# Write CRC and file sizes after the file data
|
|
fmt = '<LQQ' if zip64 else '<LLL'
|
|
self.fp.write(struct.pack(fmt, zinfo.CRC, zinfo.compress_size,
|
|
zinfo.file_size))
|
|
self.fp.flush()
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
|
|
def __del__(self):
|
|
"""Call the "close()" method in case the user forgot."""
|
|
self.close()
|
|
|
|
def close(self):
|
|
"""Close the file, and for mode "w" and "a" write the ending
|
|
records."""
|
|
if self.fp is None:
|
|
return
|
|
|
|
try:
|
|
if self.mode in ("w", "a") and self._didModify: # write ending records
|
|
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 = 0xffffffff
|
|
else:
|
|
header_offset = zinfo.header_offset
|
|
|
|
extra_data = zinfo.extra
|
|
min_version = 0
|
|
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
|
|
|
|
min_version = ZIP64_VERSION
|
|
|
|
if zinfo.compress_type == ZIP_BZIP2:
|
|
min_version = max(BZIP2_VERSION, min_version)
|
|
elif zinfo.compress_type == ZIP_LZMA:
|
|
min_version = max(LZMA_VERSION, min_version)
|
|
|
|
extract_version = max(min_version, zinfo.extract_version)
|
|
create_version = max(min_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)
|
|
|
|
endrec = struct.pack(structEndArchive, stringEndArchive,
|
|
0, 0, centDirCount, centDirCount,
|
|
centDirSize, centDirOffset, len(self._comment))
|
|
self.fp.write(endrec)
|
|
self.fp.write(self._comment)
|
|
self.fp.flush()
|
|
finally:
|
|
fp = self.fp
|
|
self.fp = None
|
|
if not self._filePassed:
|
|
fp.close()
|
|
|
|
|
|
class PyZipFile(ZipFile):
|
|
"""Class to create ZIP archives with Python library files and packages."""
|
|
|
|
def __init__(self, file, mode="r", compression=ZIP_STORED,
|
|
allowZip64=True, optimize=-1):
|
|
ZipFile.__init__(self, file, mode=mode, compression=compression,
|
|
allowZip64=allowZip64)
|
|
self._optimize = optimize
|
|
|
|
def writepy(self, pathname, basename="", filterfunc=None):
|
|
"""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.
|
|
If filterfunc(pathname) is given, it is called with every argument.
|
|
When it is False, the file or directory is skipped.
|
|
"""
|
|
if filterfunc and not filterfunc(pathname):
|
|
if self.debug:
|
|
label = 'path' if os.path.isdir(pathname) else 'file'
|
|
print('%s "%s" skipped by filterfunc' % (label, pathname))
|
|
return
|
|
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,
|
|
filterfunc=filterfunc) # Recursive call
|
|
elif ext == ".py":
|
|
if filterfunc and not filterfunc(path):
|
|
if self.debug:
|
|
print('file "%s" skipped by filterfunc' % path)
|
|
continue
|
|
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":
|
|
if filterfunc and not filterfunc(path):
|
|
if self.debug:
|
|
print('file "%s" skipped by filterfunc' % path)
|
|
continue
|
|
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 err:
|
|
print(err.msg)
|
|
return False
|
|
return True
|
|
|
|
file_py = pathname + ".py"
|
|
file_pyc = pathname + ".pyc"
|
|
file_pyo = pathname + ".pyo"
|
|
pycache_pyc = importlib.util.cache_from_source(file_py, True)
|
|
pycache_pyo = importlib.util.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("""\
|
|
Usage:
|
|
zipfile.py -l zipfile.zip # Show listing of a zipfile
|
|
zipfile.py -t zipfile.zip # Test if a zipfile is valid
|
|
zipfile.py -e zipfile.zip target # Extract zipfile into target dir
|
|
zipfile.py -c zipfile.zip src ... # Create zipfile from sources
|
|
""")
|
|
if args is None:
|
|
args = sys.argv[1:]
|
|
|
|
if not args or args[0] not in ('-l', '-c', '-e', '-t'):
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
|
|
if args[0] == '-l':
|
|
if len(args) != 2:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
with ZipFile(args[1], 'r') as zf:
|
|
zf.printdir()
|
|
|
|
elif args[0] == '-t':
|
|
if len(args) != 2:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
with ZipFile(args[1], 'r') as zf:
|
|
badfile = zf.testzip()
|
|
if badfile:
|
|
print("The following enclosed file is corrupted: {!r}".format(badfile))
|
|
print("Done testing")
|
|
|
|
elif args[0] == '-e':
|
|
if len(args) != 3:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
|
|
with ZipFile(args[1], 'r') as zf:
|
|
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))
|
|
|
|
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
|
|
|
|
with ZipFile(args[1], 'w') as zf:
|
|
for src in args[2:]:
|
|
addToZip(zf, src, os.path.basename(src))
|
|
|
|
if __name__ == "__main__":
|
|
main()
|