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c0fac96c29
(Contributed by Steven Taschuk) Replaces a bare except that caused all errors to be mis-reported as archive errors. Added a related NEWS item.
616 lines
26 KiB
Python
616 lines
26 KiB
Python
"Read and write ZIP files."
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import struct, os, time
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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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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"]
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class BadZipfile(Exception):
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pass
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error = BadZipfile # The exception raised by this module
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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 = "<4s4B4H3l5HLl"# 19 items, central directory, 46 bytes
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stringCentralDir = "PK\001\002" # magic number for central directory
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structFileHeader = "<4s2B4H3l2H" # 12 items, file header record, 30 bytes
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stringFileHeader = "PK\003\004" # magic number for file 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 _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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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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return endrec
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return # Error, return None
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class ZipInfo:
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"""Class with attributes describing each file in the ZIP archive."""
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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 != "/":
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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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self.create_system = 0 # 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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# file_offset Byte offset to the start of the file data
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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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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(self.extra))
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return header + self.filename + self.extra
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class ZipFile:
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""" Class with methods to open, read, write, close, list zip files.
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z = ZipFile(file, mode="r", compression=ZIP_STORED)
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file: Either the path to the file, or a file-like object.
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If it is a path, the file will be opened and closed by ZipFile.
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mode: The mode can be either read "r", write "w" or append "a".
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compression: ZIP_STORED (no compression) or ZIP_DEFLATED (requires zlib).
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"""
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fp = None # Set here since __del__ checks it
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def __init__(self, file, mode="r", compression=ZIP_STORED):
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"""Open the ZIP file with mode read "r", write "w" or append "a"."""
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if compression == ZIP_STORED:
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pass
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elif compression == ZIP_DEFLATED:
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if not zlib:
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raise RuntimeError,\
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"Compression requires the (missing) zlib module"
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else:
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raise RuntimeError, "That compression method is not supported"
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self.debug = 0 # Level of printing: 0 through 3
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self.NameToInfo = {} # Find file info given name
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self.filelist = [] # List of ZipInfo instances for archive
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self.compression = compression # Method of compression
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self.mode = key = mode[0]
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# Check if we were passed a file-like object
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if isinstance(file, basestring):
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self._filePassed = 0
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self.filename = file
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modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'}
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self.fp = open(file, modeDict[mode])
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else:
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self._filePassed = 1
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self.fp = file
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self.filename = getattr(file, 'name', None)
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if key == 'r':
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self._GetContents()
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elif key == 'w':
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pass
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elif key == 'a':
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try: # See if file is a zip file
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self._RealGetContents()
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# seek to start of directory and overwrite
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self.fp.seek(self.start_dir, 0)
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except BadZipfile: # file is not a zip file, just append
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self.fp.seek(0, 2)
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else:
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if not self._filePassed:
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self.fp.close()
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self.fp = None
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raise RuntimeError, 'Mode must be "r", "w" or "a"'
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def _GetContents(self):
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"""Read the directory, making sure we close the file if the format
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is bad."""
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try:
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self._RealGetContents()
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except BadZipfile:
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if not self._filePassed:
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self.fp.close()
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self.fp = None
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raise
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def _RealGetContents(self):
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"""Read in the table of contents for the ZIP file."""
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fp = self.fp
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endrec = _EndRecData(fp)
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if not endrec:
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raise BadZipfile, "File is not a zip file"
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if self.debug > 1:
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print endrec
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size_cd = endrec[5] # bytes in central directory
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offset_cd = endrec[6] # offset of central directory
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self.comment = endrec[8] # archive comment
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# endrec[9] is the offset of the "End of Central Dir" record
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x = endrec[9] - size_cd
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# "concat" is zero, unless zip was concatenated to another file
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concat = x - offset_cd
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if self.debug > 2:
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print "given, inferred, offset", offset_cd, x, concat
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# self.start_dir: Position of start of central directory
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self.start_dir = offset_cd + concat
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fp.seek(self.start_dir, 0)
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total = 0
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while total < size_cd:
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centdir = fp.read(46)
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total = total + 46
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if centdir[0:4] != stringCentralDir:
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raise BadZipfile, "Bad magic number for central directory"
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centdir = struct.unpack(structCentralDir, centdir)
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if self.debug > 2:
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print centdir
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filename = fp.read(centdir[_CD_FILENAME_LENGTH])
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# Create ZipInfo instance to store file information
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x = ZipInfo(filename)
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x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH])
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x.comment = fp.read(centdir[_CD_COMMENT_LENGTH])
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total = (total + centdir[_CD_FILENAME_LENGTH]
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+ centdir[_CD_EXTRA_FIELD_LENGTH]
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+ centdir[_CD_COMMENT_LENGTH])
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x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET] + concat
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# file_offset must be computed below...
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(x.create_version, x.create_system, x.extract_version, x.reserved,
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x.flag_bits, x.compress_type, t, d,
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x.CRC, x.compress_size, x.file_size) = centdir[1:12]
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x.volume, x.internal_attr, x.external_attr = centdir[15:18]
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# Convert date/time code to (year, month, day, hour, min, sec)
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x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F,
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t>>11, (t>>5)&0x3F, (t&0x1F) * 2 )
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self.filelist.append(x)
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self.NameToInfo[x.filename] = x
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if self.debug > 2:
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print "total", total
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for data in self.filelist:
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fp.seek(data.header_offset, 0)
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fheader = fp.read(30)
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if fheader[0:4] != stringFileHeader:
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raise BadZipfile, "Bad magic number for file header"
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fheader = struct.unpack(structFileHeader, fheader)
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# file_offset is computed here, since the extra field for
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# the central directory and for the local file header
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# refer to different fields, and they can have different
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# lengths
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data.file_offset = (data.header_offset + 30
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+ fheader[_FH_FILENAME_LENGTH]
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+ fheader[_FH_EXTRA_FIELD_LENGTH])
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fname = fp.read(fheader[_FH_FILENAME_LENGTH])
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if fname != data.orig_filename:
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raise RuntimeError, \
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'File name in directory "%s" and header "%s" differ.' % (
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data.orig_filename, fname)
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def namelist(self):
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"""Return a list of file names in the archive."""
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l = []
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for data in self.filelist:
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l.append(data.filename)
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return l
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def infolist(self):
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"""Return a list of class ZipInfo instances for files in the
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archive."""
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return self.filelist
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def printdir(self):
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"""Print a table of contents for the zip file."""
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print "%-46s %19s %12s" % ("File Name", "Modified ", "Size")
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for zinfo in self.filelist:
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date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time
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print "%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size)
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def testzip(self):
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"""Read all the files and check the CRC."""
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for zinfo in self.filelist:
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try:
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self.read(zinfo.filename) # Check CRC-32
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except BadZipfile:
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return zinfo.filename
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def getinfo(self, name):
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"""Return the instance of ZipInfo given 'name'."""
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return self.NameToInfo[name]
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def read(self, name):
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"""Return file bytes (as a string) for name."""
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if self.mode not in ("r", "a"):
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raise RuntimeError, 'read() requires mode "r" or "a"'
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if not self.fp:
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raise RuntimeError, \
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"Attempt to read ZIP archive that was already closed"
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zinfo = self.getinfo(name)
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filepos = self.fp.tell()
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self.fp.seek(zinfo.file_offset, 0)
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bytes = self.fp.read(zinfo.compress_size)
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self.fp.seek(filepos, 0)
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if zinfo.compress_type == ZIP_STORED:
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pass
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elif zinfo.compress_type == ZIP_DEFLATED:
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if not zlib:
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raise RuntimeError, \
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"De-compression requires the (missing) zlib module"
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# zlib compress/decompress code by Jeremy Hylton of CNRI
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dc = zlib.decompressobj(-15)
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bytes = dc.decompress(bytes)
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# need to feed in unused pad byte so that zlib won't choke
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ex = dc.decompress('Z') + dc.flush()
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if ex:
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bytes = bytes + ex
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else:
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raise BadZipfile, \
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"Unsupported compression method %d for file %s" % \
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(zinfo.compress_type, name)
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crc = binascii.crc32(bytes)
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if crc != zinfo.CRC:
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raise BadZipfile, "Bad CRC-32 for file %s" % name
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return bytes
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def _writecheck(self, zinfo):
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"""Check for errors before writing a file to the archive."""
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if zinfo.filename in self.NameToInfo:
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if self.debug: # Warning for duplicate names
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print "Duplicate name:", zinfo.filename
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if self.mode not in ("w", "a"):
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raise RuntimeError, 'write() requires mode "w" or "a"'
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if not self.fp:
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raise RuntimeError, \
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"Attempt to write ZIP archive that was already closed"
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if zinfo.compress_type == ZIP_DEFLATED and not zlib:
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raise RuntimeError, \
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"Compression requires the (missing) zlib module"
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if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED):
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raise RuntimeError, \
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"That compression method is not supported"
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def write(self, filename, arcname=None, compress_type=None):
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"""Put the bytes from filename into the archive under the name
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arcname."""
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st = os.stat(filename)
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mtime = time.localtime(st.st_mtime)
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date_time = mtime[0:6]
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# Create ZipInfo instance to store file information
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if arcname is None:
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zinfo = ZipInfo(filename, date_time)
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else:
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zinfo = ZipInfo(arcname, date_time)
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zinfo.external_attr = st[0] << 16L # Unix attributes
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if compress_type is None:
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zinfo.compress_type = self.compression
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else:
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zinfo.compress_type = compress_type
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self._writecheck(zinfo)
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fp = open(filename, "rb")
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zinfo.flag_bits = 0x00
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zinfo.header_offset = self.fp.tell() # Start of header bytes
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# Must overwrite CRC and sizes with correct data later
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zinfo.CRC = CRC = 0
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zinfo.compress_size = compress_size = 0
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zinfo.file_size = file_size = 0
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self.fp.write(zinfo.FileHeader())
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zinfo.file_offset = self.fp.tell() # Start of file bytes
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if zinfo.compress_type == ZIP_DEFLATED:
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cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
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zlib.DEFLATED, -15)
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else:
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cmpr = None
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while 1:
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buf = fp.read(1024 * 8)
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if not buf:
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break
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file_size = file_size + len(buf)
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CRC = binascii.crc32(buf, CRC)
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if cmpr:
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buf = cmpr.compress(buf)
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compress_size = compress_size + len(buf)
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self.fp.write(buf)
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fp.close()
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if cmpr:
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buf = cmpr.flush()
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compress_size = compress_size + len(buf)
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self.fp.write(buf)
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zinfo.compress_size = compress_size
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else:
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zinfo.compress_size = file_size
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zinfo.CRC = CRC
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zinfo.file_size = file_size
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# Seek backwards and write CRC and file sizes
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position = self.fp.tell() # Preserve current position in file
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self.fp.seek(zinfo.header_offset + 14, 0)
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self.fp.write(struct.pack("<lll", zinfo.CRC, zinfo.compress_size,
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zinfo.file_size))
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self.fp.seek(position, 0)
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self.filelist.append(zinfo)
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self.NameToInfo[zinfo.filename] = zinfo
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def writestr(self, zinfo_or_arcname, bytes):
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"""Write a file into the archive. The contents is the string
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'bytes'. 'zinfo_or_arcname' is either a ZipInfo instance or
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the name of the file in the archive."""
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if not isinstance(zinfo_or_arcname, ZipInfo):
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zinfo = ZipInfo(filename=zinfo_or_arcname,
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date_time=time.localtime(time.time()))
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zinfo.compress_type = self.compression
|
|
else:
|
|
zinfo = zinfo_or_arcname
|
|
self._writecheck(zinfo)
|
|
zinfo.file_size = len(bytes) # Uncompressed size
|
|
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())
|
|
zinfo.file_offset = self.fp.tell() # Start of file bytes
|
|
self.fp.write(bytes)
|
|
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"): # 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)
|
|
centdir = struct.pack(structCentralDir,
|
|
stringCentralDir, zinfo.create_version,
|
|
zinfo.create_system, zinfo.extract_version, zinfo.reserved,
|
|
zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
|
|
zinfo.CRC, zinfo.compress_size, zinfo.file_size,
|
|
len(zinfo.filename), len(zinfo.extra), len(zinfo.comment),
|
|
0, zinfo.internal_attr, zinfo.external_attr,
|
|
zinfo.header_offset)
|
|
self.fp.write(centdir)
|
|
self.fp.write(zinfo.filename)
|
|
self.fp.write(zinfo.extra)
|
|
self.fp.write(zinfo.comment)
|
|
pos2 = self.fp.tell()
|
|
# Write end-of-zip-archive record
|
|
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,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)
|