from zipfile import ZIP_STORED, ZIP_DEFLATED from rpython.rlib.streamio import open_file_as_stream from rpython.rlib.rstruct.runpack import runpack from rpython.rlib.rarithmetic import r_uint, intmask from rpython.rtyper.tool.rffi_platform import CompilationError import os try: from rpython.rlib import rzlib except CompilationError: rzlib = None crc_32_tab = [ 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d ] crc_32_tab = map(r_uint, crc_32_tab) def crc32(s, crc=r_uint(0)): crc = ~crc & r_uint(0xffffffffL) for c in s: crc = crc_32_tab[(crc ^ r_uint(ord(c))) & 0xffL] ^ (crc >> 8) #/* Note: (crc >> 8) MUST zero fill on left return crc ^ r_uint(0xffffffffL) # parts copied from zipfile library implementation class BadZipfile(Exception): pass # Here are some struct module formats for reading headers structEndArchive = "<4s4H2lH" # 9 items, end of archive, 22 bytes stringEndArchive = "PK\005\006" # magic number for end of archive record structCentralDir = "<4s4B4HlLL5HLl"# 19 items, central directory, 46 bytes stringCentralDir = "PK\001\002" # magic number for central directory structFileHeader = "<4s2B4HlLL2H" # 12 items, file header record, 30 bytes stringFileHeader = "PK\003\004" # magic number for file header # indexes of entries in the central directory structure _CD_SIGNATURE = 0 _CD_CREATE_VERSION = 1 _CD_CREATE_SYSTEM = 2 _CD_EXTRACT_VERSION = 3 _CD_EXTRACT_SYSTEM = 4 # is this meaningful? _CD_FLAG_BITS = 5 _CD_COMPRESS_TYPE = 6 _CD_TIME = 7 _CD_DATE = 8 _CD_CRC = 9 _CD_COMPRESSED_SIZE = 10 _CD_UNCOMPRESSED_SIZE = 11 _CD_FILENAME_LENGTH = 12 _CD_EXTRA_FIELD_LENGTH = 13 _CD_COMMENT_LENGTH = 14 _CD_DISK_NUMBER_START = 15 _CD_INTERNAL_FILE_ATTRIBUTES = 16 _CD_EXTERNAL_FILE_ATTRIBUTES = 17 _CD_LOCAL_HEADER_OFFSET = 18 # indexes of entries in the local file header structure _FH_SIGNATURE = 0 _FH_EXTRACT_VERSION = 1 _FH_EXTRACT_SYSTEM = 2 # is this meaningful? _FH_GENERAL_PURPOSE_FLAG_BITS = 3 _FH_COMPRESSION_METHOD = 4 _FH_LAST_MOD_TIME = 5 _FH_LAST_MOD_DATE = 6 _FH_CRC = 7 _FH_COMPRESSED_SIZE = 8 _FH_UNCOMPRESSED_SIZE = 9 _FH_FILENAME_LENGTH = 10 _FH_EXTRA_FIELD_LENGTH = 11 class EndRecStruct(object): def __init__(self, stuff, comment, filesize): self.stuff = stuff self.comment = comment self.filesize = filesize def _EndRecData(fpin): """Return data from the "End of Central Directory" record, or None. The data is a list of the nine items in the ZIP "End of central dir" record followed by a tenth item, the file seek offset of this record.""" fpin.seek(-22, 2) # Assume no archive comment. filesize = fpin.tell() + 22 # Get file size data = fpin.readall() start = len(data)-2 if start <= 0: return # Error, return None if data[0:4] == stringEndArchive and data[start:] == "\000\000": endrec = runpack(structEndArchive, data) return EndRecStruct(endrec, "", filesize - 22) # Search the last END_BLOCK bytes of the file for the record signature. # The comment is appended to the ZIP file and has a 16 bit length. # So the comment may be up to 64K long. We limit the search for the # signature to a few Kbytes at the end of the file for efficiency. # also, the signature must not appear in the comment. END_BLOCK = min(filesize, 1024 * 4) fpin.seek(filesize - END_BLOCK, 0) data = fpin.readall() start = data.rfind(stringEndArchive) if start >= 0: # Correct signature string was found endrec = runpack(structEndArchive, data[start:start+22]) comment = data[start+22:] if endrec[7] == len(comment): # Comment length checks out # Append the archive comment and start offset return EndRecStruct(endrec, comment, filesize - END_BLOCK + start) return # Error, return None class RZipInfo(object): def __init__(self, filename, date_time=(1980,1,1,0,0,0)): self.orig_filename = filename null_byte = filename.find(chr(0)) if null_byte >= 0: filename = filename[0:null_byte] # This is used to ensure paths in generated ZIP files always use # forward slashes as the directory separator, as required by the # ZIP format specification. if os.sep != "/": filename = filename.replace(os.sep, "/") self.filename = filename # Normalized file name self.date_time = date_time # year, month, day, hour, min, sec # Standard values: self.compress_type = ZIP_STORED # Type of compression for the file self.comment = "" # Comment for each file self.extra = "" # ZIP extra data self.create_system = 0 # System which created ZIP archive self.create_version = 20 # Version which created ZIP archive self.extract_version = 20 # Version needed to extract archive self.reserved = 0 # Must be zero self.flag_bits = 0 # ZIP flag bits self.volume = 0 # Volume number of file header self.internal_attr = 0 # Internal attributes self.external_attr = 0 # External file attributes # Other attributes are set by class ZipFile: # header_offset Byte offset to the file header # file_offset Byte offset to the start of the file data # CRC CRC-32 of the uncompressed file # compress_size Size of the compressed file # file_size Size of the uncompressed file class RZipFile(object): def __init__(self, zipname, mode='r', compression=ZIP_STORED): if mode != 'r': raise TypeError("Read only support by now") self.compression = compression self.filename = zipname self.filelist = [] self.NameToInfo = {} if 'b' not in mode: mode += 'b' self.mode = mode fp = self.get_fp() try: self._GetContents(fp) finally: fp.close() def get_fp(self): return open_file_as_stream(self.filename, self.mode, 1024) def _GetContents(self, fp): endrec = _EndRecData(fp) if not endrec: raise BadZipfile("File is not a zip file") size_cd = endrec.stuff[5] # bytes in central directory offset_cd = endrec.stuff[6] # offset of central directory self.comment = endrec.comment x = endrec.filesize - size_cd concat = x - offset_cd self.start_dir = offset_cd + concat fp.seek(self.start_dir, 0) 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 = runpack(structCentralDir, centdir) filename = fp.read(centdir[_CD_FILENAME_LENGTH]) # Create ZipInfo instance to store file information x = RZipInfo(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] + concat # file_offset must be computed below... (x.create_version, x.create_system, x.extract_version, x.reserved, x.flag_bits, x.compress_type, t, d, crc, x.compress_size, x.file_size) = centdir[1:12] x.CRC = r_uint(crc) & r_uint(0xffffffff) x.dostime = t x.dosdate = d 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 ) self.filelist.append(x) self.NameToInfo[x.filename] = x for data in self.filelist: fp.seek(data.header_offset, 0) fheader = fp.read(30) if fheader[0:4] != stringFileHeader: raise BadZipfile("Bad magic number for file header") fheader = runpack(structFileHeader, fheader) # file_offset is computed here, since the extra field for # the central directory and for the local file header # refer to different fields, and they can have different # lengths data.file_offset = (data.header_offset + 30 + fheader[_FH_FILENAME_LENGTH] + fheader[_FH_EXTRA_FIELD_LENGTH]) fname = fp.read(fheader[_FH_FILENAME_LENGTH]) if fname != data.orig_filename: raise BadZipfile('File name in directory "%s" and ' 'header "%s" differ.' % (data.orig_filename, fname)) fp.seek(self.start_dir, 0) def getinfo(self, filename): """Return the instance of ZipInfo given 'filename'.""" return self.NameToInfo[filename] def read(self, filename): zinfo = self.getinfo(filename) fp = self.get_fp() try: filepos = fp.tell() fp.seek(zinfo.file_offset, 0) bytes = fp.read(intmask(zinfo.compress_size)) fp.seek(filepos, 0) if zinfo.compress_type == ZIP_STORED: pass elif zinfo.compress_type == ZIP_DEFLATED and rzlib is not None: stream = rzlib.inflateInit(wbits=-15) try: bytes, _, _ = rzlib.decompress(stream, bytes) # need to feed in unused pad byte so that zlib won't choke ex, _, _ = rzlib.decompress(stream, 'Z') if ex: bytes = bytes + ex finally: rzlib.inflateEnd(stream) elif zinfo.compress_type == ZIP_DEFLATED: raise BadZipfile("Cannot decompress file, zlib not installed") else: raise BadZipfile("Unsupported compression method %d for " "file %s" % (zinfo.compress_type, filename)) crc = crc32(bytes) if crc != zinfo.CRC: raise BadZipfile("Bad CRC-32 for file %s" % filename) return bytes finally: fp.close()