1193 lines
44 KiB
Python
1193 lines
44 KiB
Python
"""
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Read and write ZIP files.
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"""
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import struct, os, time, sys
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import binascii, io
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try:
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import zlib # We may need its compression method
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except ImportError:
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zlib = None
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__all__ = ["BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "is_zipfile",
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"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 # The exception raised by this module
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ZIP64_LIMIT= (1 << 31) - 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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# Other ZIP compression methods not supported
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# Here are some struct module formats for reading headers
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structEndArchive = "<4s4H2lH" # 9 items, end of archive, 22 bytes
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stringEndArchive = "PK\005\006" # magic number for end of archive record
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structCentralDir = "<4s4B4HlLL5HLl"# 19 items, central directory, 46 bytes
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stringCentralDir = "PK\001\002" # magic number for central directory
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structFileHeader = "<4s2B4HlLL2H" # 12 items, file header record, 30 bytes
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stringFileHeader = "PK\003\004" # magic number for file header
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structEndArchive64Locator = "<4slql" # 4 items, locate Zip64 header, 20 bytes
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stringEndArchive64Locator = "PK\x06\x07" # magic token for locator header
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structEndArchive64 = "<4sqhhllqqqq" # 10 items, end of archive (Zip64), 56 bytes
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stringEndArchive64 = "PK\x06\x06" # magic token for Zip64 header
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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 # is this meaningful?
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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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# indexes of entries in the local file header structure
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_FH_SIGNATURE = 0
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_FH_EXTRACT_VERSION = 1
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_FH_EXTRACT_SYSTEM = 2 # is this meaningful?
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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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def is_zipfile(filename):
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"""Quickly see if file is a ZIP file by checking the magic number."""
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try:
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fpin = open(filename, "rb")
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endrec = _EndRecData(fpin)
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fpin.close()
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if endrec:
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return True # file has correct magic number
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except IOError:
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pass
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return False
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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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locatorSize = struct.calcsize(structEndArchive64Locator)
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fpin.seek(offset - locatorSize, 2)
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data = fpin.read(locatorSize)
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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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endArchiveSize = struct.calcsize(structEndArchive64)
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fpin.seek(offset - locatorSize - endArchiveSize, 2)
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data = fpin.read(endArchiveSize)
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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[1] = disk_num
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endrec[2] = disk_dir
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endrec[3] = dircount
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endrec[4] = dircount2
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endrec[5] = dirsize
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endrec[6] = 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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fpin.seek(-22, 2) # Assume no archive comment.
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filesize = fpin.tell() + 22 # Get file size
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data = fpin.read()
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if data[0:4] == stringEndArchive and data[-2:] == "\000\000":
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endrec = struct.unpack(structEndArchive, data)
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endrec = list(endrec)
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endrec.append("") # Append the archive comment
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endrec.append(filesize - 22) # Append the record start offset
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if endrec[-4] == -1 or endrec[-4] == 0xffffffff:
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return _EndRecData64(fpin, -22, endrec)
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return endrec
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# Search the last END_BLOCK bytes of the file for the record signature.
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# The comment is appended to the ZIP file and has a 16 bit length.
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# So the comment may be up to 64K long. We limit the search for the
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# signature to a few Kbytes at the end of the file for efficiency.
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# also, the signature must not appear in the comment.
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END_BLOCK = min(filesize, 1024 * 4)
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fpin.seek(filesize - END_BLOCK, 0)
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data = fpin.read()
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start = data.rfind(stringEndArchive)
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if start >= 0: # Correct signature string was found
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endrec = struct.unpack(structEndArchive, data[start:start+22])
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endrec = list(endrec)
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comment = data[start+22:]
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if endrec[7] == len(comment): # Comment length checks out
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# Append the archive comment and start offset
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endrec.append(comment)
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endrec.append(filesize - END_BLOCK + start)
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if endrec[-4] == -1 or endrec[-4] == 0xffffffff:
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return _EndRecData64(fpin, - END_BLOCK + start, endrec)
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return endrec
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return # Error, 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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)
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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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# Standard values:
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self.compress_type = ZIP_STORED # Type of compression for the file
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self.comment = "" # Comment for each file
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self.extra = "" # 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 = 20 # Version which created ZIP archive
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self.extract_version = 20 # 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):
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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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if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
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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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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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file_size = 0xffffffff # -1
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compress_size = 0xffffffff # -1
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self.extract_version = max(45, self.extract_version)
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self.create_version = max(45, self.extract_version)
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header = struct.pack(structFileHeader, stringFileHeader,
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self.extract_version, self.reserved, self.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(self.filename), len(extra))
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return header + self.filename + extra
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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 == -1 or self.file_size == 0xFFFFFFFF:
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self.file_size = counts[idx]
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idx += 1
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if self.compress_size == -1 or 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 == -1 or 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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|
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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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for low-level securicy.
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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 = _GenerateCRCTable()
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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 ^ ord(ch)) & 0xff]
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def __init__(self, pwd):
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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
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self.key2 = self._crc32(chr((self.key1 >> 24) & 255), self.key2)
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def __call__(self, c):
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"""Decrypt a single character."""
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# XXX When this is called with a byte instead of a char, ord()
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# isn't needed. Don't die in that case. In the future we should
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# just leave this out, once we're always using bytes.
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try:
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c = ord(c)
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except TypeError:
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pass
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k = self.key2 | 2
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c = c ^ (((k * (k^1)) >> 8) & 255)
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c = chr(c)
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self._UpdateKeys(c)
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return c
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class ZipExtFile:
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"""File-like object for reading an archive member.
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Is returned by ZipFile.open().
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"""
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def __init__(self, fileobj, zipinfo, decrypt=None):
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self.fileobj = fileobj
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self.decrypter = decrypt
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self.bytes_read = 0
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self.rawbuffer = ''
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self.readbuffer = ''
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self.linebuffer = ''
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self.eof = False
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self.univ_newlines = False
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self.nlSeps = ("\n", )
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self.lastdiscard = ''
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self.compress_type = zipinfo.compress_type
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self.compress_size = zipinfo.compress_size
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self.closed = False
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self.mode = "r"
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self.name = zipinfo.filename
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# read from compressed files in 64k blocks
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self.compreadsize = 64*1024
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if self.compress_type == ZIP_DEFLATED:
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self.dc = zlib.decompressobj(-15)
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def set_univ_newlines(self, univ_newlines):
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self.univ_newlines = univ_newlines
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# pick line separator char(s) based on universal newlines flag
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self.nlSeps = ("\n", )
|
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if self.univ_newlines:
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self.nlSeps = ("\r\n", "\r", "\n")
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|
|
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def __iter__(self):
|
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return self
|
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def __next__(self):
|
|
nextline = self.readline()
|
|
if not nextline:
|
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raise StopIteration()
|
|
|
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return nextline
|
|
|
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def close(self):
|
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self.closed = True
|
|
|
|
def _checkfornewline(self):
|
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nl, nllen = -1, -1
|
|
if self.linebuffer:
|
|
# ugly check for cases where half of an \r\n pair was
|
|
# read on the last pass, and the \r was discarded. In this
|
|
# case we just throw away the \n at the start of the buffer.
|
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if (self.lastdiscard, self.linebuffer[0]) == ('\r','\n'):
|
|
self.linebuffer = self.linebuffer[1:]
|
|
|
|
for sep in self.nlSeps:
|
|
nl = self.linebuffer.find(sep)
|
|
if nl >= 0:
|
|
nllen = len(sep)
|
|
return nl, nllen
|
|
|
|
return nl, nllen
|
|
|
|
def readline(self, size = -1):
|
|
"""Read a line with approx. size. If size is negative,
|
|
read a whole line.
|
|
"""
|
|
if size < 0:
|
|
size = sys.maxint
|
|
elif size == 0:
|
|
return ''
|
|
|
|
# check for a newline already in buffer
|
|
nl, nllen = self._checkfornewline()
|
|
|
|
if nl >= 0:
|
|
# the next line was already in the buffer
|
|
nl = min(nl, size)
|
|
else:
|
|
# no line break in buffer - try to read more
|
|
size -= len(self.linebuffer)
|
|
while nl < 0 and size > 0:
|
|
buf = self.read(min(size, 100))
|
|
if not buf:
|
|
break
|
|
self.linebuffer += buf
|
|
size -= len(buf)
|
|
|
|
# check for a newline in buffer
|
|
nl, nllen = self._checkfornewline()
|
|
|
|
# we either ran out of bytes in the file, or
|
|
# met the specified size limit without finding a newline,
|
|
# so return current buffer
|
|
if nl < 0:
|
|
s = self.linebuffer
|
|
self.linebuffer = ''
|
|
return s
|
|
|
|
buf = self.linebuffer[:nl]
|
|
self.lastdiscard = self.linebuffer[nl:nl + nllen]
|
|
self.linebuffer = self.linebuffer[nl + nllen:]
|
|
|
|
# line is always returned with \n as newline char (except possibly
|
|
# for a final incomplete line in the file, which is handled above).
|
|
return buf + "\n"
|
|
|
|
def readlines(self, sizehint = -1):
|
|
"""Return a list with all (following) lines. The sizehint parameter
|
|
is ignored in this implementation.
|
|
"""
|
|
result = []
|
|
while True:
|
|
line = self.readline()
|
|
if not line: break
|
|
result.append(line)
|
|
return result
|
|
|
|
def read(self, size = None):
|
|
# act like file() obj and return empty string if size is 0
|
|
if size == 0:
|
|
return ''
|
|
|
|
# determine read size
|
|
bytesToRead = self.compress_size - self.bytes_read
|
|
|
|
# adjust read size for encrypted files since the first 12 bytes
|
|
# are for the encryption/password information
|
|
if self.decrypter is not None:
|
|
bytesToRead -= 12
|
|
|
|
if size is not None and size >= 0:
|
|
if self.compress_type == ZIP_STORED:
|
|
lr = len(self.readbuffer)
|
|
bytesToRead = min(bytesToRead, size - lr)
|
|
elif self.compress_type == ZIP_DEFLATED:
|
|
if len(self.readbuffer) > size:
|
|
# the user has requested fewer bytes than we've already
|
|
# pulled through the decompressor; don't read any more
|
|
bytesToRead = 0
|
|
else:
|
|
# user will use up the buffer, so read some more
|
|
lr = len(self.rawbuffer)
|
|
bytesToRead = min(bytesToRead, self.compreadsize - lr)
|
|
|
|
# avoid reading past end of file contents
|
|
if bytesToRead + self.bytes_read > self.compress_size:
|
|
bytesToRead = self.compress_size - self.bytes_read
|
|
|
|
# try to read from file (if necessary)
|
|
if bytesToRead > 0:
|
|
bytes = self.fileobj.read(bytesToRead)
|
|
self.bytes_read += len(bytes)
|
|
self.rawbuffer += bytes
|
|
|
|
# handle contents of raw buffer
|
|
if self.rawbuffer:
|
|
newdata = self.rawbuffer
|
|
self.rawbuffer = ''
|
|
|
|
# decrypt new data if we were given an object to handle that
|
|
if newdata and self.decrypter is not None:
|
|
newdata = ''.join(map(self.decrypter, newdata))
|
|
|
|
# decompress newly read data if necessary
|
|
if newdata and self.compress_type == ZIP_DEFLATED:
|
|
newdata = self.dc.decompress(newdata)
|
|
self.rawbuffer = self.dc.unconsumed_tail
|
|
if self.eof and len(self.rawbuffer) == 0:
|
|
# we're out of raw bytes (both from the file and
|
|
# the local buffer); flush just to make sure the
|
|
# decompressor is done
|
|
newdata += self.dc.flush()
|
|
# prevent decompressor from being used again
|
|
self.dc = None
|
|
|
|
self.readbuffer += newdata
|
|
|
|
|
|
# return what the user asked for
|
|
if size is None or len(self.readbuffer) <= size:
|
|
bytes = self.readbuffer
|
|
self.readbuffer = ''
|
|
else:
|
|
bytes = self.readbuffer[:size]
|
|
self.readbuffer = self.readbuffer[size:]
|
|
|
|
return bytes
|
|
|
|
|
|
class ZipFile:
|
|
""" Class with methods to open, read, write, close, list zip files.
|
|
|
|
z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=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) or ZIP_DEFLATED (requires zlib).
|
|
allowZip64: if True ZipFile will create files with ZIP64 extensions when
|
|
needed, otherwise it will raise an exception when this would
|
|
be necessary.
|
|
|
|
"""
|
|
|
|
fp = None # Set here since __del__ checks it
|
|
|
|
def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=False):
|
|
"""Open the ZIP file with mode read "r", write "w" or append "a"."""
|
|
self._allowZip64 = allowZip64
|
|
self._didModify = False
|
|
if compression == ZIP_STORED:
|
|
pass
|
|
elif compression == ZIP_DEFLATED:
|
|
if not zlib:
|
|
raise RuntimeError,\
|
|
"Compression requires the (missing) zlib module"
|
|
else:
|
|
raise RuntimeError, "That compression method is not supported"
|
|
self.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
|
|
|
|
# Check if we were passed a file-like object
|
|
if isinstance(file, basestring):
|
|
self._filePassed = 0
|
|
self.filename = file
|
|
modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'}
|
|
try:
|
|
self.fp = open(file, modeDict[mode])
|
|
except IOError:
|
|
if mode == 'a':
|
|
mode = key = 'w'
|
|
self.fp = open(file, modeDict[mode])
|
|
else:
|
|
raise
|
|
else:
|
|
self._filePassed = 1
|
|
self.fp = file
|
|
self.filename = getattr(file, 'name', None)
|
|
|
|
if key == 'r':
|
|
self._GetContents()
|
|
elif key == 'w':
|
|
pass
|
|
elif key == 'a':
|
|
try: # See if file is a zip file
|
|
self._RealGetContents()
|
|
# seek to start of directory and overwrite
|
|
self.fp.seek(self.start_dir, 0)
|
|
except BadZipfile: # file is not a zip file, just append
|
|
self.fp.seek(0, 2)
|
|
else:
|
|
if not self._filePassed:
|
|
self.fp.close()
|
|
self.fp = None
|
|
raise RuntimeError, 'Mode must be "r", "w" or "a"'
|
|
|
|
def _GetContents(self):
|
|
"""Read the directory, making sure we close the file if the format
|
|
is bad."""
|
|
try:
|
|
self._RealGetContents()
|
|
except BadZipfile:
|
|
if not self._filePassed:
|
|
self.fp.close()
|
|
self.fp = None
|
|
raise
|
|
|
|
def _RealGetContents(self):
|
|
"""Read in the table of contents for the ZIP file."""
|
|
fp = self.fp
|
|
endrec = _EndRecData(fp)
|
|
if not endrec:
|
|
raise BadZipfile, "File is not a zip file"
|
|
if self.debug > 1:
|
|
print(endrec)
|
|
size_cd = endrec[5] # bytes in central directory
|
|
offset_cd = endrec[6] # offset of central directory
|
|
self.comment = endrec[8] # archive comment
|
|
# endrec[9] is the offset of the "End of Central Dir" record
|
|
if endrec[9] > ZIP64_LIMIT:
|
|
x = endrec[9] - size_cd - 56 - 20
|
|
else:
|
|
x = endrec[9] - size_cd
|
|
# "concat" is zero, unless zip was concatenated to another file
|
|
concat = x - offset_cd
|
|
if self.debug > 2:
|
|
print("given, inferred, offset", offset_cd, x, 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.StringIO(data)
|
|
total = 0
|
|
while total < size_cd:
|
|
centdir = fp.read(46)
|
|
total = total + 46
|
|
if centdir[0:4] != stringCentralDir:
|
|
raise BadZipfile, "Bad magic number for central directory"
|
|
centdir = struct.unpack(structCentralDir, centdir)
|
|
if self.debug > 2:
|
|
print(centdir)
|
|
filename = fp.read(centdir[_CD_FILENAME_LENGTH])
|
|
# Create ZipInfo instance to store file information
|
|
x = ZipInfo(filename)
|
|
x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH])
|
|
x.comment = fp.read(centdir[_CD_COMMENT_LENGTH])
|
|
total = (total + centdir[_CD_FILENAME_LENGTH]
|
|
+ centdir[_CD_EXTRA_FIELD_LENGTH]
|
|
+ centdir[_CD_COMMENT_LENGTH])
|
|
x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET]
|
|
(x.create_version, x.create_system, x.extract_version, x.reserved,
|
|
x.flag_bits, x.compress_type, t, d,
|
|
x.CRC, x.compress_size, x.file_size) = centdir[1:12]
|
|
x.volume, x.internal_attr, x.external_attr = centdir[15:18]
|
|
# Convert date/time code to (year, month, day, hour, min, sec)
|
|
x.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
|
|
if self.debug > 2:
|
|
print("total", total)
|
|
|
|
|
|
def namelist(self):
|
|
"""Return a list of file names in the archive."""
|
|
l = []
|
|
for data in self.filelist:
|
|
l.append(data.filename)
|
|
return l
|
|
|
|
def infolist(self):
|
|
"""Return a list of class ZipInfo instances for files in the
|
|
archive."""
|
|
return self.filelist
|
|
|
|
def printdir(self):
|
|
"""Print a table of contents for the zip file."""
|
|
print("%-46s %19s %12s" % ("File Name", "Modified ", "Size"))
|
|
for zinfo in self.filelist:
|
|
date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time
|
|
print("%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size))
|
|
|
|
def testzip(self):
|
|
"""Read all the files and check the CRC."""
|
|
for zinfo in self.filelist:
|
|
try:
|
|
self.read(zinfo.filename) # Check CRC-32
|
|
except BadZipfile:
|
|
return zinfo.filename
|
|
|
|
|
|
def getinfo(self, name):
|
|
"""Return the instance of ZipInfo given 'name'."""
|
|
return self.NameToInfo[name]
|
|
|
|
def setpassword(self, pwd):
|
|
"""Set default password for encrypted files."""
|
|
self.pwd = pwd
|
|
|
|
def read(self, name, pwd=None):
|
|
"""Return file bytes (as a string) for name."""
|
|
return self.open(name, "r", pwd).read()
|
|
|
|
def open(self, name, mode="r", pwd=None):
|
|
"""Return file-like object for 'name'."""
|
|
if mode not in ("r", "U", "rU"):
|
|
raise RuntimeError, 'open() requires mode "r", "U", or "rU"'
|
|
if not self.fp:
|
|
raise RuntimeError, \
|
|
"Attempt to read ZIP archive that was already closed"
|
|
|
|
# Only open a new file for instances where we were not
|
|
# given a file object in the constructor
|
|
if self._filePassed:
|
|
zef_file = self.fp
|
|
else:
|
|
zef_file = open(self.filename, 'rb')
|
|
|
|
# Get info object for name
|
|
zinfo = self.getinfo(name)
|
|
|
|
filepos = zef_file.tell()
|
|
|
|
zef_file.seek(zinfo.header_offset, 0)
|
|
|
|
# Skip the file header:
|
|
fheader = zef_file.read(30)
|
|
if fheader[0:4] != stringFileHeader:
|
|
raise BadZipfile, "Bad magic number for file header"
|
|
|
|
fheader = struct.unpack(structFileHeader, fheader)
|
|
fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
|
|
if fheader[_FH_EXTRA_FIELD_LENGTH]:
|
|
zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])
|
|
|
|
if fname != zinfo.orig_filename:
|
|
raise BadZipfile, \
|
|
'File name in directory "%s" and header "%s" differ.' % (
|
|
zinfo.orig_filename, fname)
|
|
|
|
# check for encrypted flag & handle password
|
|
is_encrypted = zinfo.flag_bits & 0x1
|
|
zd = None
|
|
if is_encrypted:
|
|
if not pwd:
|
|
pwd = self.pwd
|
|
if not pwd:
|
|
raise RuntimeError, "File %s is encrypted, " \
|
|
"password required for extraction" % name
|
|
|
|
zd = _ZipDecrypter(pwd)
|
|
# The first 12 bytes in the cypher stream is an encryption header
|
|
# used to strengthen the algorithm. The first 11 bytes are
|
|
# completely random, while the 12th contains the MSB of the CRC,
|
|
# and is used to check the correctness of the password.
|
|
bytes = zef_file.read(12)
|
|
h = map(zd, bytes[0:12])
|
|
if ord(h[11]) != ((zinfo.CRC>>24)&255):
|
|
raise RuntimeError, "Bad password for file %s" % name
|
|
|
|
# build and return a ZipExtFile
|
|
if zd is None:
|
|
zef = ZipExtFile(zef_file, zinfo)
|
|
else:
|
|
zef = ZipExtFile(zef_file, zinfo, zd)
|
|
|
|
# set universal newlines on ZipExtFile if necessary
|
|
if "U" in mode:
|
|
zef.set_univ_newlines(True)
|
|
return zef
|
|
|
|
def _writecheck(self, zinfo):
|
|
"""Check for errors before writing a file to the archive."""
|
|
if zinfo.filename in self.NameToInfo:
|
|
if self.debug: # Warning for duplicate names
|
|
print("Duplicate name:", zinfo.filename)
|
|
if self.mode not in ("w", "a"):
|
|
raise RuntimeError, 'write() requires mode "w" or "a"'
|
|
if not self.fp:
|
|
raise RuntimeError, \
|
|
"Attempt to write ZIP archive that was already closed"
|
|
if zinfo.compress_type == ZIP_DEFLATED and not zlib:
|
|
raise RuntimeError, \
|
|
"Compression requires the (missing) zlib module"
|
|
if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED):
|
|
raise RuntimeError, \
|
|
"That compression method is not supported"
|
|
if zinfo.file_size > ZIP64_LIMIT:
|
|
if not self._allowZip64:
|
|
raise LargeZipFile("Filesize would require ZIP64 extensions")
|
|
if zinfo.header_offset > ZIP64_LIMIT:
|
|
if not self._allowZip64:
|
|
raise LargeZipFile("Zipfile size would require ZIP64 extensions")
|
|
|
|
def write(self, filename, arcname=None, compress_type=None):
|
|
"""Put the bytes from filename into the archive under the name
|
|
arcname."""
|
|
st = os.stat(filename)
|
|
mtime = time.localtime(st.st_mtime)
|
|
date_time = mtime[0:6]
|
|
# Create ZipInfo instance to store file information
|
|
if arcname is None:
|
|
arcname = filename
|
|
arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
|
|
while arcname[0] in (os.sep, os.altsep):
|
|
arcname = arcname[1:]
|
|
zinfo = ZipInfo(arcname, date_time)
|
|
zinfo.external_attr = (st[0] & 0xFFFF) << 16 # Unix attributes
|
|
if compress_type is None:
|
|
zinfo.compress_type = self.compression
|
|
else:
|
|
zinfo.compress_type = compress_type
|
|
|
|
zinfo.file_size = st.st_size
|
|
zinfo.flag_bits = 0x00
|
|
zinfo.header_offset = self.fp.tell() # Start of header bytes
|
|
|
|
self._writecheck(zinfo)
|
|
self._didModify = True
|
|
fp = open(filename, "rb")
|
|
# Must overwrite CRC and sizes with correct data later
|
|
zinfo.CRC = CRC = 0
|
|
zinfo.compress_size = compress_size = 0
|
|
zinfo.file_size = file_size = 0
|
|
self.fp.write(zinfo.FileHeader())
|
|
if zinfo.compress_type == ZIP_DEFLATED:
|
|
cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
|
|
zlib.DEFLATED, -15)
|
|
else:
|
|
cmpr = None
|
|
while 1:
|
|
buf = fp.read(1024 * 8)
|
|
if not buf:
|
|
break
|
|
file_size = file_size + len(buf)
|
|
CRC = binascii.crc32(buf, CRC)
|
|
if cmpr:
|
|
buf = cmpr.compress(buf)
|
|
compress_size = compress_size + len(buf)
|
|
self.fp.write(buf)
|
|
fp.close()
|
|
if cmpr:
|
|
buf = cmpr.flush()
|
|
compress_size = compress_size + len(buf)
|
|
self.fp.write(buf)
|
|
zinfo.compress_size = compress_size
|
|
else:
|
|
zinfo.compress_size = file_size
|
|
zinfo.CRC = CRC
|
|
zinfo.file_size = file_size
|
|
# Seek backwards and write CRC and file sizes
|
|
position = self.fp.tell() # Preserve current position in file
|
|
self.fp.seek(zinfo.header_offset + 14, 0)
|
|
self.fp.write(struct.pack("<lLL", zinfo.CRC, zinfo.compress_size,
|
|
zinfo.file_size))
|
|
self.fp.seek(position, 0)
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
|
|
def writestr(self, zinfo_or_arcname, bytes):
|
|
"""Write a file into the archive. The contents is the string
|
|
'bytes'. 'zinfo_or_arcname' is either a ZipInfo instance or
|
|
the name of the file in the archive."""
|
|
if not isinstance(zinfo_or_arcname, ZipInfo):
|
|
zinfo = ZipInfo(filename=zinfo_or_arcname,
|
|
date_time=time.localtime(time.time()))
|
|
zinfo.compress_type = self.compression
|
|
else:
|
|
zinfo = zinfo_or_arcname
|
|
zinfo.file_size = len(bytes) # Uncompressed size
|
|
zinfo.header_offset = self.fp.tell() # Start of header bytes
|
|
self._writecheck(zinfo)
|
|
self._didModify = True
|
|
zinfo.CRC = binascii.crc32(bytes) # CRC-32 checksum
|
|
if zinfo.compress_type == ZIP_DEFLATED:
|
|
co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
|
|
zlib.DEFLATED, -15)
|
|
bytes = co.compress(bytes) + co.flush()
|
|
zinfo.compress_size = len(bytes) # Compressed size
|
|
else:
|
|
zinfo.compress_size = zinfo.file_size
|
|
zinfo.header_offset = self.fp.tell() # Start of header bytes
|
|
self.fp.write(zinfo.FileHeader())
|
|
self.fp.write(bytes)
|
|
self.fp.flush()
|
|
if zinfo.flag_bits & 0x08:
|
|
# Write CRC and file sizes after the file data
|
|
self.fp.write(struct.pack("<lLL", zinfo.CRC, zinfo.compress_size,
|
|
zinfo.file_size))
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
|
|
def __del__(self):
|
|
"""Call the "close()" method in case the user forgot."""
|
|
self.close()
|
|
|
|
def close(self):
|
|
"""Close the file, and for mode "w" and "a" write the ending
|
|
records."""
|
|
if self.fp is None:
|
|
return
|
|
|
|
if self.mode in ("w", "a") and self._didModify: # write ending records
|
|
count = 0
|
|
pos1 = self.fp.tell()
|
|
for zinfo in self.filelist: # write central directory
|
|
count = count + 1
|
|
dt = zinfo.date_time
|
|
dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
|
|
dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
|
|
extra = []
|
|
if zinfo.file_size > ZIP64_LIMIT \
|
|
or zinfo.compress_size > ZIP64_LIMIT:
|
|
extra.append(zinfo.file_size)
|
|
extra.append(zinfo.compress_size)
|
|
file_size = 0xffffffff #-1
|
|
compress_size = 0xffffffff #-1
|
|
else:
|
|
file_size = zinfo.file_size
|
|
compress_size = zinfo.compress_size
|
|
|
|
if zinfo.header_offset > ZIP64_LIMIT:
|
|
extra.append(zinfo.header_offset)
|
|
header_offset = -1 # struct "l" format: 32 one bits
|
|
else:
|
|
header_offset = zinfo.header_offset
|
|
|
|
extra_data = zinfo.extra
|
|
if extra:
|
|
# Append a ZIP64 field to the extra's
|
|
extra_data = struct.pack(
|
|
'<hh' + 'q'*len(extra),
|
|
1, 8*len(extra), *extra) + extra_data
|
|
|
|
extract_version = max(45, zinfo.extract_version)
|
|
create_version = max(45, zinfo.create_version)
|
|
else:
|
|
extract_version = zinfo.extract_version
|
|
create_version = zinfo.create_version
|
|
|
|
centdir = struct.pack(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)
|
|
self.fp.write(centdir)
|
|
self.fp.write(zinfo.filename)
|
|
self.fp.write(extra_data)
|
|
self.fp.write(zinfo.comment)
|
|
|
|
pos2 = self.fp.tell()
|
|
# Write end-of-zip-archive record
|
|
if pos1 > ZIP64_LIMIT:
|
|
# Need to write the ZIP64 end-of-archive records
|
|
zip64endrec = struct.pack(
|
|
structEndArchive64, stringEndArchive64,
|
|
44, 45, 45, 0, 0, count, count, pos2 - pos1, pos1)
|
|
self.fp.write(zip64endrec)
|
|
|
|
zip64locrec = struct.pack(
|
|
structEndArchive64Locator,
|
|
stringEndArchive64Locator, 0, pos2, 1)
|
|
self.fp.write(zip64locrec)
|
|
|
|
# XXX Why is `pos3` computed next? It's never referenced.
|
|
pos3 = self.fp.tell()
|
|
endrec = struct.pack(structEndArchive, stringEndArchive,
|
|
0, 0, count, count, pos2 - pos1, -1, 0)
|
|
self.fp.write(endrec)
|
|
|
|
else:
|
|
endrec = struct.pack(structEndArchive, stringEndArchive,
|
|
0, 0, count, count, pos2 - pos1, pos1, 0)
|
|
self.fp.write(endrec)
|
|
self.fp.flush()
|
|
if not self._filePassed:
|
|
self.fp.close()
|
|
self.fp = None
|
|
|
|
|
|
class PyZipFile(ZipFile):
|
|
"""Class to create ZIP archives with Python library files and packages."""
|
|
|
|
def writepy(self, pathname, basename = ""):
|
|
"""Add all files from "pathname" to the ZIP archive.
|
|
|
|
If pathname is a package directory, search the directory and
|
|
all package subdirectories recursively for all *.py and enter
|
|
the modules into the archive. If pathname is a plain
|
|
directory, listdir *.py and enter all modules. Else, pathname
|
|
must be a Python *.py file and the module will be put into the
|
|
archive. Added modules are always module.pyo or module.pyc.
|
|
This method will compile the module.py into module.pyc if
|
|
necessary.
|
|
"""
|
|
dir, name = os.path.split(pathname)
|
|
if os.path.isdir(pathname):
|
|
initname = os.path.join(pathname, "__init__.py")
|
|
if os.path.isfile(initname):
|
|
# This is a package directory, add it
|
|
if basename:
|
|
basename = "%s/%s" % (basename, name)
|
|
else:
|
|
basename = name
|
|
if self.debug:
|
|
print("Adding package in", pathname, "as", basename)
|
|
fname, arcname = self._get_codename(initname[0:-3], basename)
|
|
if self.debug:
|
|
print("Adding", arcname)
|
|
self.write(fname, arcname)
|
|
dirlist = os.listdir(pathname)
|
|
dirlist.remove("__init__.py")
|
|
# Add all *.py files and package subdirectories
|
|
for filename in dirlist:
|
|
path = os.path.join(pathname, filename)
|
|
root, ext = os.path.splitext(filename)
|
|
if os.path.isdir(path):
|
|
if os.path.isfile(os.path.join(path, "__init__.py")):
|
|
# This is a package directory, add it
|
|
self.writepy(path, basename) # Recursive call
|
|
elif ext == ".py":
|
|
fname, arcname = self._get_codename(path[0:-3],
|
|
basename)
|
|
if self.debug:
|
|
print("Adding", arcname)
|
|
self.write(fname, arcname)
|
|
else:
|
|
# This is NOT a package directory, add its files at top level
|
|
if self.debug:
|
|
print("Adding files from directory", pathname)
|
|
for filename in os.listdir(pathname):
|
|
path = os.path.join(pathname, filename)
|
|
root, ext = os.path.splitext(filename)
|
|
if ext == ".py":
|
|
fname, arcname = self._get_codename(path[0:-3],
|
|
basename)
|
|
if self.debug:
|
|
print("Adding", arcname)
|
|
self.write(fname, arcname)
|
|
else:
|
|
if pathname[-3:] != ".py":
|
|
raise RuntimeError, \
|
|
'Files added with writepy() must end with ".py"'
|
|
fname, arcname = self._get_codename(pathname[0:-3], basename)
|
|
if self.debug:
|
|
print("Adding file", arcname)
|
|
self.write(fname, arcname)
|
|
|
|
def _get_codename(self, pathname, basename):
|
|
"""Return (filename, archivename) for the path.
|
|
|
|
Given a module name path, return the correct file path and
|
|
archive name, compiling if necessary. For example, given
|
|
/python/lib/string, return (/python/lib/string.pyc, string).
|
|
"""
|
|
file_py = pathname + ".py"
|
|
file_pyc = pathname + ".pyc"
|
|
file_pyo = pathname + ".pyo"
|
|
if os.path.isfile(file_pyo) and \
|
|
os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime:
|
|
fname = file_pyo # Use .pyo file
|
|
elif not os.path.isfile(file_pyc) or \
|
|
os.stat(file_pyc).st_mtime < os.stat(file_py).st_mtime:
|
|
import py_compile
|
|
if self.debug:
|
|
print("Compiling", file_py)
|
|
try:
|
|
py_compile.compile(file_py, file_pyc, None, True)
|
|
except py_compile.PyCompileError as err:
|
|
print(err.msg)
|
|
fname = file_pyc
|
|
else:
|
|
fname = file_pyc
|
|
archivename = os.path.split(fname)[1]
|
|
if basename:
|
|
archivename = "%s/%s" % (basename, archivename)
|
|
return (fname, archivename)
|
|
|
|
|
|
def main(args = None):
|
|
import textwrap
|
|
USAGE=textwrap.dedent("""\
|
|
Usage:
|
|
zipfile.py -l zipfile.zip # Show listing of a zipfile
|
|
zipfile.py -t zipfile.zip # Test if a zipfile is valid
|
|
zipfile.py -e zipfile.zip target # Extract zipfile into target dir
|
|
zipfile.py -c zipfile.zip src ... # Create zipfile from sources
|
|
""")
|
|
if args is None:
|
|
args = sys.argv[1:]
|
|
|
|
if not args or args[0] not in ('-l', '-c', '-e', '-t'):
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
|
|
if args[0] == '-l':
|
|
if len(args) != 2:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
zf = ZipFile(args[1], 'r')
|
|
zf.printdir()
|
|
zf.close()
|
|
|
|
elif args[0] == '-t':
|
|
if len(args) != 2:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
zf = ZipFile(args[1], 'r')
|
|
zf.testzip()
|
|
print("Done testing")
|
|
|
|
elif args[0] == '-e':
|
|
if len(args) != 3:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
|
|
zf = ZipFile(args[1], 'r')
|
|
out = args[2]
|
|
for path in zf.namelist():
|
|
if path.startswith('./'):
|
|
tgt = os.path.join(out, path[2:])
|
|
else:
|
|
tgt = os.path.join(out, path)
|
|
|
|
tgtdir = os.path.dirname(tgt)
|
|
if not os.path.exists(tgtdir):
|
|
os.makedirs(tgtdir)
|
|
fp = open(tgt, 'wb')
|
|
fp.write(zf.read(path))
|
|
fp.close()
|
|
zf.close()
|
|
|
|
elif args[0] == '-c':
|
|
if len(args) < 3:
|
|
print(USAGE)
|
|
sys.exit(1)
|
|
|
|
def addToZip(zf, path, zippath):
|
|
if os.path.isfile(path):
|
|
zf.write(path, zippath, ZIP_DEFLATED)
|
|
elif os.path.isdir(path):
|
|
for nm in os.listdir(path):
|
|
addToZip(zf,
|
|
os.path.join(path, nm), os.path.join(zippath, nm))
|
|
# else: ignore
|
|
|
|
zf = ZipFile(args[1], 'w', allowZip64=True)
|
|
for src in args[2:]:
|
|
addToZip(zf, src, os.path.basename(src))
|
|
|
|
zf.close()
|
|
|
|
if __name__ == "__main__":
|
|
main()
|