mirror of
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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 extra:
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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)
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self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295
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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()
|