Mercurial > ~astiob > upreckon > hgweb
annotate 2.00/zipfile27.py @ 30:f17f19d9eb0a
hasattr -> try in the newly added 2.6 zipfile
| author | Oleg Oshmyan <chortos@inbox.lv> |
|---|---|
| date | Wed, 24 Nov 2010 23:42:06 +0000 |
| parents | a8cc383b787c |
| children |
| rev | line source |
|---|---|
| 21 | 1 """ |
| 2 Read and write ZIP files. | |
| 3 """ | |
| 4 # Improved by Chortos-2 in 2010 (added bzip2 support) | |
| 5 import struct, os, time, sys, shutil | |
| 6 import binascii, cStringIO, stat | |
| 7 import io | |
| 8 import re | |
| 9 | |
| 10 try: | |
| 11 import zlib # We may need its compression method | |
| 12 crc32 = zlib.crc32 | |
| 13 except ImportError: | |
| 14 zlib = None | |
| 15 crc32 = binascii.crc32 | |
| 16 | |
| 17 try: | |
| 18 import bz2 # We may need its compression method | |
| 19 except ImportError: | |
| 20 bz2 = None | |
| 21 | |
| 22 __all__ = ["BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "is_zipfile", | |
| 23 "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile", "ZIP_BZIP2" ] | |
| 24 | |
| 25 class BadZipfile(Exception): | |
| 26 pass | |
| 27 | |
| 28 | |
| 29 class LargeZipFile(Exception): | |
| 30 """ | |
| 31 Raised when writing a zipfile, the zipfile requires ZIP64 extensions | |
| 32 and those extensions are disabled. | |
| 33 """ | |
| 34 | |
| 35 error = BadZipfile # The exception raised by this module | |
| 36 | |
| 37 ZIP64_LIMIT = (1 << 31) - 1 | |
| 38 ZIP_FILECOUNT_LIMIT = 1 << 16 | |
| 39 ZIP_MAX_COMMENT = (1 << 16) - 1 | |
| 40 | |
| 41 # constants for Zip file compression methods | |
| 42 ZIP_STORED = 0 | |
| 43 ZIP_DEFLATED = 8 | |
| 44 ZIP_BZIP2 = 12 | |
| 45 # Other ZIP compression methods not supported | |
| 46 | |
| 47 # Below are some formats and associated data for reading/writing headers using | |
| 48 # the struct module. The names and structures of headers/records are those used | |
| 49 # in the PKWARE description of the ZIP file format: | |
| 50 # http://www.pkware.com/documents/casestudies/APPNOTE.TXT | |
| 51 # (URL valid as of January 2008) | |
| 52 | |
| 53 # The "end of central directory" structure, magic number, size, and indices | |
| 54 # (section V.I in the format document) | |
| 55 structEndArchive = "<4s4H2LH" | |
| 56 stringEndArchive = "PK\005\006" | |
| 57 sizeEndCentDir = struct.calcsize(structEndArchive) | |
| 58 | |
| 59 _ECD_SIGNATURE = 0 | |
| 60 _ECD_DISK_NUMBER = 1 | |
| 61 _ECD_DISK_START = 2 | |
| 62 _ECD_ENTRIES_THIS_DISK = 3 | |
| 63 _ECD_ENTRIES_TOTAL = 4 | |
| 64 _ECD_SIZE = 5 | |
| 65 _ECD_OFFSET = 6 | |
| 66 _ECD_COMMENT_SIZE = 7 | |
| 67 # These last two indices are not part of the structure as defined in the | |
| 68 # spec, but they are used internally by this module as a convenience | |
| 69 _ECD_COMMENT = 8 | |
| 70 _ECD_LOCATION = 9 | |
| 71 | |
| 72 # The "central directory" structure, magic number, size, and indices | |
| 73 # of entries in the structure (section V.F in the format document) | |
| 74 structCentralDir = "<4s4B4HL2L5H2L" | |
| 75 stringCentralDir = "PK\001\002" | |
| 76 sizeCentralDir = struct.calcsize(structCentralDir) | |
| 77 | |
| 78 # indexes of entries in the central directory structure | |
| 79 _CD_SIGNATURE = 0 | |
| 80 _CD_CREATE_VERSION = 1 | |
| 81 _CD_CREATE_SYSTEM = 2 | |
| 82 _CD_EXTRACT_VERSION = 3 | |
| 83 _CD_EXTRACT_SYSTEM = 4 | |
| 84 _CD_FLAG_BITS = 5 | |
| 85 _CD_COMPRESS_TYPE = 6 | |
| 86 _CD_TIME = 7 | |
| 87 _CD_DATE = 8 | |
| 88 _CD_CRC = 9 | |
| 89 _CD_COMPRESSED_SIZE = 10 | |
| 90 _CD_UNCOMPRESSED_SIZE = 11 | |
| 91 _CD_FILENAME_LENGTH = 12 | |
| 92 _CD_EXTRA_FIELD_LENGTH = 13 | |
| 93 _CD_COMMENT_LENGTH = 14 | |
| 94 _CD_DISK_NUMBER_START = 15 | |
| 95 _CD_INTERNAL_FILE_ATTRIBUTES = 16 | |
| 96 _CD_EXTERNAL_FILE_ATTRIBUTES = 17 | |
| 97 _CD_LOCAL_HEADER_OFFSET = 18 | |
| 98 | |
| 99 # The "local file header" structure, magic number, size, and indices | |
| 100 # (section V.A in the format document) | |
| 101 structFileHeader = "<4s2B4HL2L2H" | |
| 102 stringFileHeader = "PK\003\004" | |
| 103 sizeFileHeader = struct.calcsize(structFileHeader) | |
| 104 | |
| 105 _FH_SIGNATURE = 0 | |
| 106 _FH_EXTRACT_VERSION = 1 | |
| 107 _FH_EXTRACT_SYSTEM = 2 | |
| 108 _FH_GENERAL_PURPOSE_FLAG_BITS = 3 | |
| 109 _FH_COMPRESSION_METHOD = 4 | |
| 110 _FH_LAST_MOD_TIME = 5 | |
| 111 _FH_LAST_MOD_DATE = 6 | |
| 112 _FH_CRC = 7 | |
| 113 _FH_COMPRESSED_SIZE = 8 | |
| 114 _FH_UNCOMPRESSED_SIZE = 9 | |
| 115 _FH_FILENAME_LENGTH = 10 | |
| 116 _FH_EXTRA_FIELD_LENGTH = 11 | |
| 117 | |
| 118 # The "Zip64 end of central directory locator" structure, magic number, and size | |
| 119 structEndArchive64Locator = "<4sLQL" | |
| 120 stringEndArchive64Locator = "PK\x06\x07" | |
| 121 sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator) | |
| 122 | |
| 123 # The "Zip64 end of central directory" record, magic number, size, and indices | |
| 124 # (section V.G in the format document) | |
| 125 structEndArchive64 = "<4sQ2H2L4Q" | |
| 126 stringEndArchive64 = "PK\x06\x06" | |
| 127 sizeEndCentDir64 = struct.calcsize(structEndArchive64) | |
| 128 | |
| 129 _CD64_SIGNATURE = 0 | |
| 130 _CD64_DIRECTORY_RECSIZE = 1 | |
| 131 _CD64_CREATE_VERSION = 2 | |
| 132 _CD64_EXTRACT_VERSION = 3 | |
| 133 _CD64_DISK_NUMBER = 4 | |
| 134 _CD64_DISK_NUMBER_START = 5 | |
| 135 _CD64_NUMBER_ENTRIES_THIS_DISK = 6 | |
| 136 _CD64_NUMBER_ENTRIES_TOTAL = 7 | |
| 137 _CD64_DIRECTORY_SIZE = 8 | |
| 138 _CD64_OFFSET_START_CENTDIR = 9 | |
| 139 | |
| 140 def _check_zipfile(fp): | |
| 141 try: | |
| 142 if _EndRecData(fp): | |
| 143 return True # file has correct magic number | |
| 144 except IOError: | |
| 145 pass | |
| 146 return False | |
| 147 | |
| 148 def is_zipfile(filename): | |
| 149 """Quickly see if a file is a ZIP file by checking the magic number. | |
| 150 | |
| 151 The filename argument may be a file or file-like object too. | |
| 152 """ | |
| 153 result = False | |
| 154 try: | |
| 155 if hasattr(filename, "read"): | |
| 156 result = _check_zipfile(fp=filename) | |
| 157 else: | |
| 158 with open(filename, "rb") as fp: | |
| 159 result = _check_zipfile(fp) | |
| 160 except IOError: | |
| 161 pass | |
| 162 return result | |
| 163 | |
| 164 def _EndRecData64(fpin, offset, endrec): | |
| 165 """ | |
| 166 Read the ZIP64 end-of-archive records and use that to update endrec | |
| 167 """ | |
| 168 fpin.seek(offset - sizeEndCentDir64Locator, 2) | |
| 169 data = fpin.read(sizeEndCentDir64Locator) | |
| 170 sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data) | |
| 171 if sig != stringEndArchive64Locator: | |
| 172 return endrec | |
| 173 | |
| 174 if diskno != 0 or disks != 1: | |
| 175 raise BadZipfile("zipfiles that span multiple disks are not supported") | |
| 176 | |
| 177 # Assume no 'zip64 extensible data' | |
| 178 fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2) | |
| 179 data = fpin.read(sizeEndCentDir64) | |
| 180 sig, sz, create_version, read_version, disk_num, disk_dir, \ | |
| 181 dircount, dircount2, dirsize, diroffset = \ | |
| 182 struct.unpack(structEndArchive64, data) | |
| 183 if sig != stringEndArchive64: | |
| 184 return endrec | |
| 185 | |
| 186 # Update the original endrec using data from the ZIP64 record | |
| 187 endrec[_ECD_SIGNATURE] = sig | |
| 188 endrec[_ECD_DISK_NUMBER] = disk_num | |
| 189 endrec[_ECD_DISK_START] = disk_dir | |
| 190 endrec[_ECD_ENTRIES_THIS_DISK] = dircount | |
| 191 endrec[_ECD_ENTRIES_TOTAL] = dircount2 | |
| 192 endrec[_ECD_SIZE] = dirsize | |
| 193 endrec[_ECD_OFFSET] = diroffset | |
| 194 return endrec | |
| 195 | |
| 196 | |
| 197 def _EndRecData(fpin): | |
| 198 """Return data from the "End of Central Directory" record, or None. | |
| 199 | |
| 200 The data is a list of the nine items in the ZIP "End of central dir" | |
| 201 record followed by a tenth item, the file seek offset of this record.""" | |
| 202 | |
| 203 # Determine file size | |
| 204 fpin.seek(0, 2) | |
| 205 filesize = fpin.tell() | |
| 206 | |
| 207 # Check to see if this is ZIP file with no archive comment (the | |
| 208 # "end of central directory" structure should be the last item in the | |
| 209 # file if this is the case). | |
| 210 try: | |
| 211 fpin.seek(-sizeEndCentDir, 2) | |
| 212 except IOError: | |
| 213 return None | |
| 214 data = fpin.read() | |
| 215 if data[0:4] == stringEndArchive and data[-2:] == "\000\000": | |
| 216 # the signature is correct and there's no comment, unpack structure | |
| 217 endrec = struct.unpack(structEndArchive, data) | |
| 218 endrec=list(endrec) | |
| 219 | |
| 220 # Append a blank comment and record start offset | |
| 221 endrec.append("") | |
| 222 endrec.append(filesize - sizeEndCentDir) | |
| 223 | |
| 224 # Try to read the "Zip64 end of central directory" structure | |
| 225 return _EndRecData64(fpin, -sizeEndCentDir, endrec) | |
| 226 | |
| 227 # Either this is not a ZIP file, or it is a ZIP file with an archive | |
| 228 # comment. Search the end of the file for the "end of central directory" | |
| 229 # record signature. The comment is the last item in the ZIP file and may be | |
| 230 # up to 64K long. It is assumed that the "end of central directory" magic | |
| 231 # number does not appear in the comment. | |
| 232 maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0) | |
| 233 fpin.seek(maxCommentStart, 0) | |
| 234 data = fpin.read() | |
| 235 start = data.rfind(stringEndArchive) | |
| 236 if start >= 0: | |
| 237 # found the magic number; attempt to unpack and interpret | |
| 238 recData = data[start:start+sizeEndCentDir] | |
| 239 endrec = list(struct.unpack(structEndArchive, recData)) | |
| 240 comment = data[start+sizeEndCentDir:] | |
| 241 # check that comment length is correct | |
| 242 if endrec[_ECD_COMMENT_SIZE] == len(comment): | |
| 243 # Append the archive comment and start offset | |
| 244 endrec.append(comment) | |
| 245 endrec.append(maxCommentStart + start) | |
| 246 | |
| 247 # Try to read the "Zip64 end of central directory" structure | |
| 248 return _EndRecData64(fpin, maxCommentStart + start - filesize, | |
| 249 endrec) | |
| 250 | |
| 251 # Unable to find a valid end of central directory structure | |
| 252 return | |
| 253 | |
| 254 | |
| 255 class ZipInfo (object): | |
| 256 """Class with attributes describing each file in the ZIP archive.""" | |
| 257 | |
| 258 __slots__ = ( | |
| 259 'orig_filename', | |
| 260 'filename', | |
| 261 'date_time', | |
| 262 'compress_type', | |
| 263 'comment', | |
| 264 'extra', | |
| 265 'create_system', | |
| 266 'create_version', | |
| 267 'extract_version', | |
| 268 'reserved', | |
| 269 'flag_bits', | |
| 270 'volume', | |
| 271 'internal_attr', | |
| 272 'external_attr', | |
| 273 'header_offset', | |
| 274 'CRC', | |
| 275 'compress_size', | |
| 276 'file_size', | |
| 277 '_raw_time', | |
| 278 ) | |
| 279 | |
| 280 def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)): | |
| 281 self.orig_filename = filename # Original file name in archive | |
| 282 | |
| 283 # Terminate the file name at the first null byte. Null bytes in file | |
| 284 # names are used as tricks by viruses in archives. | |
| 285 null_byte = filename.find(chr(0)) | |
| 286 if null_byte >= 0: | |
| 287 filename = filename[0:null_byte] | |
| 288 # This is used to ensure paths in generated ZIP files always use | |
| 289 # forward slashes as the directory separator, as required by the | |
| 290 # ZIP format specification. | |
| 291 if os.sep != "/" and os.sep in filename: | |
| 292 filename = filename.replace(os.sep, "/") | |
| 293 | |
| 294 self.filename = filename # Normalized file name | |
| 295 self.date_time = date_time # year, month, day, hour, min, sec | |
| 296 # Standard values: | |
| 297 self.compress_type = ZIP_STORED # Type of compression for the file | |
| 298 self.comment = "" # Comment for each file | |
| 299 self.extra = "" # ZIP extra data | |
| 300 if sys.platform == 'win32': | |
| 301 self.create_system = 0 # System which created ZIP archive | |
| 302 else: | |
| 303 # Assume everything else is unix-y | |
| 304 self.create_system = 3 # System which created ZIP archive | |
| 305 self.create_version = 20 # Version which created ZIP archive | |
| 306 self.extract_version = 20 # Version needed to extract archive | |
| 307 self.reserved = 0 # Must be zero | |
| 308 self.flag_bits = 0 # ZIP flag bits | |
| 309 self.volume = 0 # Volume number of file header | |
| 310 self.internal_attr = 0 # Internal attributes | |
| 311 self.external_attr = 0 # External file attributes | |
| 312 # Other attributes are set by class ZipFile: | |
| 313 # header_offset Byte offset to the file header | |
| 314 # CRC CRC-32 of the uncompressed file | |
| 315 # compress_size Size of the compressed file | |
| 316 # file_size Size of the uncompressed file | |
| 317 | |
| 318 def FileHeader(self): | |
| 319 """Return the per-file header as a string.""" | |
| 320 dt = self.date_time | |
| 321 dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2] | |
| 322 dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2) | |
| 323 if self.flag_bits & 0x08: | |
| 324 # Set these to zero because we write them after the file data | |
| 325 CRC = compress_size = file_size = 0 | |
| 326 else: | |
| 327 CRC = self.CRC | |
| 328 compress_size = self.compress_size | |
| 329 file_size = self.file_size | |
| 330 | |
| 331 extra = self.extra | |
| 332 | |
| 333 if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT: | |
| 334 # File is larger than what fits into a 4 byte integer, | |
| 335 # fall back to the ZIP64 extension | |
| 336 fmt = '<HHQQ' | |
| 337 extra = extra + struct.pack(fmt, | |
| 338 1, struct.calcsize(fmt)-4, file_size, compress_size) | |
| 339 file_size = 0xffffffff | |
| 340 compress_size = 0xffffffff | |
| 341 self.extract_version = max(45, self.extract_version) | |
| 342 self.create_version = max(45, self.extract_version) | |
| 343 | |
| 344 filename, flag_bits = self._encodeFilenameFlags() | |
| 345 header = struct.pack(structFileHeader, stringFileHeader, | |
| 346 self.extract_version, self.reserved, flag_bits, | |
| 347 self.compress_type, dostime, dosdate, CRC, | |
| 348 compress_size, file_size, | |
| 349 len(filename), len(extra)) | |
| 350 return header + filename + extra | |
| 351 | |
| 352 def _encodeFilenameFlags(self): | |
| 353 if isinstance(self.filename, unicode): | |
| 354 try: | |
| 355 return self.filename.encode('ascii'), self.flag_bits | |
| 356 except UnicodeEncodeError: | |
| 357 return self.filename.encode('utf-8'), self.flag_bits | 0x800 | |
| 358 else: | |
| 359 return self.filename, self.flag_bits | |
| 360 | |
| 361 def _decodeFilename(self): | |
| 362 if self.flag_bits & 0x800: | |
| 363 return self.filename.decode('utf-8') | |
| 364 else: | |
| 365 return self.filename | |
| 366 | |
| 367 def _decodeExtra(self): | |
| 368 # Try to decode the extra field. | |
| 369 extra = self.extra | |
| 370 unpack = struct.unpack | |
| 371 while extra: | |
| 372 tp, ln = unpack('<HH', extra[:4]) | |
| 373 if tp == 1: | |
| 374 if ln >= 24: | |
| 375 counts = unpack('<QQQ', extra[4:28]) | |
| 376 elif ln == 16: | |
| 377 counts = unpack('<QQ', extra[4:20]) | |
| 378 elif ln == 8: | |
| 379 counts = unpack('<Q', extra[4:12]) | |
| 380 elif ln == 0: | |
| 381 counts = () | |
| 382 else: | |
| 383 raise RuntimeError, "Corrupt extra field %s"%(ln,) | |
| 384 | |
| 385 idx = 0 | |
| 386 | |
| 387 # ZIP64 extension (large files and/or large archives) | |
| 388 if self.file_size in (0xffffffffffffffffL, 0xffffffffL): | |
| 389 self.file_size = counts[idx] | |
| 390 idx += 1 | |
| 391 | |
| 392 if self.compress_size == 0xFFFFFFFFL: | |
| 393 self.compress_size = counts[idx] | |
| 394 idx += 1 | |
| 395 | |
| 396 if self.header_offset == 0xffffffffL: | |
| 397 old = self.header_offset | |
| 398 self.header_offset = counts[idx] | |
| 399 idx+=1 | |
| 400 | |
| 401 extra = extra[ln+4:] | |
| 402 | |
| 403 | |
| 404 class _ZipDecrypter: | |
| 405 """Class to handle decryption of files stored within a ZIP archive. | |
| 406 | |
| 407 ZIP supports a password-based form of encryption. Even though known | |
| 408 plaintext attacks have been found against it, it is still useful | |
| 409 to be able to get data out of such a file. | |
| 410 | |
| 411 Usage: | |
| 412 zd = _ZipDecrypter(mypwd) | |
| 413 plain_char = zd(cypher_char) | |
| 414 plain_text = map(zd, cypher_text) | |
| 415 """ | |
| 416 | |
| 417 def _GenerateCRCTable(): | |
| 418 """Generate a CRC-32 table. | |
| 419 | |
| 420 ZIP encryption uses the CRC32 one-byte primitive for scrambling some | |
| 421 internal keys. We noticed that a direct implementation is faster than | |
| 422 relying on binascii.crc32(). | |
| 423 """ | |
| 424 poly = 0xedb88320 | |
| 425 table = [0] * 256 | |
| 426 for i in range(256): | |
| 427 crc = i | |
| 428 for j in range(8): | |
| 429 if crc & 1: | |
| 430 crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly | |
| 431 else: | |
| 432 crc = ((crc >> 1) & 0x7FFFFFFF) | |
| 433 table[i] = crc | |
| 434 return table | |
| 435 crctable = _GenerateCRCTable() | |
| 436 | |
| 437 def _crc32(self, ch, crc): | |
| 438 """Compute the CRC32 primitive on one byte.""" | |
| 439 return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ord(ch)) & 0xff] | |
| 440 | |
| 441 def __init__(self, pwd): | |
| 442 self.key0 = 305419896 | |
| 443 self.key1 = 591751049 | |
| 444 self.key2 = 878082192 | |
| 445 for p in pwd: | |
| 446 self._UpdateKeys(p) | |
| 447 | |
| 448 def _UpdateKeys(self, c): | |
| 449 self.key0 = self._crc32(c, self.key0) | |
| 450 self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295 | |
| 451 self.key1 = (self.key1 * 134775813 + 1) & 4294967295 | |
| 452 self.key2 = self._crc32(chr((self.key1 >> 24) & 255), self.key2) | |
| 453 | |
| 454 def __call__(self, c): | |
| 455 """Decrypt a single character.""" | |
| 456 c = ord(c) | |
| 457 k = self.key2 | 2 | |
| 458 c = c ^ (((k * (k^1)) >> 8) & 255) | |
| 459 c = chr(c) | |
| 460 self._UpdateKeys(c) | |
| 461 return c | |
| 462 | |
| 463 class ZipExtFile(io.BufferedIOBase): | |
| 464 """File-like object for reading an archive member. | |
| 465 Is returned by ZipFile.open(). | |
| 466 """ | |
| 467 | |
| 468 # Max size supported by decompressor. | |
| 469 MAX_N = 1 << 31 - 1 | |
| 470 | |
| 471 # Read from compressed files in 4k blocks. | |
| 472 MIN_READ_SIZE = 4096 | |
| 473 | |
| 474 # Search for universal newlines or line chunks. | |
| 475 PATTERN = re.compile(r'^(?P<chunk>[^\r\n]+)|(?P<newline>\n|\r\n?)') | |
| 476 | |
| 477 def __init__(self, fileobj, mode, zipinfo, decrypter=None): | |
| 478 self._fileobj = fileobj | |
| 479 self._decrypter = decrypter | |
| 480 | |
| 481 self._compress_type = zipinfo.compress_type | |
| 482 self._compress_size = zipinfo.compress_size | |
| 483 self._compress_left = zipinfo.compress_size | |
| 484 | |
| 485 if self._compress_type == ZIP_DEFLATED: | |
| 486 self._decompressor = zlib.decompressobj(-15) | |
| 487 elif self._compress_type == ZIP_BZIP2: | |
| 488 self._decompressor = bz2.BZ2Decompressor() | |
| 489 self.MIN_READ_SIZE = 900000 | |
| 490 self._unconsumed = '' | |
| 491 | |
| 492 self._readbuffer = '' | |
| 493 self._offset = 0 | |
| 494 | |
| 495 self._universal = 'U' in mode | |
| 496 self.newlines = None | |
| 497 | |
| 498 # Adjust read size for encrypted files since the first 12 bytes | |
| 499 # are for the encryption/password information. | |
| 500 if self._decrypter is not None: | |
| 501 self._compress_left -= 12 | |
| 502 | |
| 503 self.mode = mode | |
| 504 self.name = zipinfo.filename | |
| 505 | |
|
29
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
506 if hasattr(zipinfo, 'CRC'): |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
507 self._expected_crc = zipinfo.CRC |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
508 self._running_crc = crc32(b'') & 0xffffffff |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
509 else: |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
510 self._expected_crc = None |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
511 |
| 21 | 512 def readline(self, limit=-1): |
| 513 """Read and return a line from the stream. | |
| 514 | |
| 515 If limit is specified, at most limit bytes will be read. | |
| 516 """ | |
| 517 | |
| 518 if not self._universal and limit < 0: | |
| 519 # Shortcut common case - newline found in buffer. | |
| 520 i = self._readbuffer.find('\n', self._offset) + 1 | |
| 521 if i > 0: | |
| 522 line = self._readbuffer[self._offset: i] | |
| 523 self._offset = i | |
| 524 return line | |
| 525 | |
| 526 if not self._universal: | |
| 527 return io.BufferedIOBase.readline(self, limit) | |
| 528 | |
| 529 line = '' | |
| 530 while limit < 0 or len(line) < limit: | |
| 531 readahead = self.peek(2) | |
| 532 if readahead == '': | |
| 533 return line | |
| 534 | |
| 535 # | |
| 536 # Search for universal newlines or line chunks. | |
| 537 # | |
| 538 # The pattern returns either a line chunk or a newline, but not | |
| 539 # both. Combined with peek(2), we are assured that the sequence | |
| 540 # '\r\n' is always retrieved completely and never split into | |
| 541 # separate newlines - '\r', '\n' due to coincidental readaheads. | |
| 542 # | |
| 543 match = self.PATTERN.search(readahead) | |
| 544 newline = match.group('newline') | |
| 545 if newline is not None: | |
| 546 if self.newlines is None: | |
| 547 self.newlines = [] | |
| 548 if newline not in self.newlines: | |
| 549 self.newlines.append(newline) | |
| 550 self._offset += len(newline) | |
| 551 return line + '\n' | |
| 552 | |
| 553 chunk = match.group('chunk') | |
| 554 if limit >= 0: | |
| 555 chunk = chunk[: limit - len(line)] | |
| 556 | |
| 557 self._offset += len(chunk) | |
| 558 line += chunk | |
| 559 | |
| 560 return line | |
| 561 | |
| 562 def peek(self, n=1): | |
| 563 """Returns buffered bytes without advancing the position.""" | |
| 564 if n > len(self._readbuffer) - self._offset: | |
| 565 chunk = self.read(n) | |
| 566 self._offset -= len(chunk) | |
| 567 | |
| 568 # Return up to 512 bytes to reduce allocation overhead for tight loops. | |
| 569 return self._readbuffer[self._offset: self._offset + 512] | |
| 570 | |
| 571 def readable(self): | |
| 572 return True | |
| 573 | |
| 574 def read(self, n=-1): | |
| 575 """Read and return up to n bytes. | |
| 576 If the argument is omitted, None, or negative, data is read and returned until EOF is reached.. | |
| 577 """ | |
| 578 buf = '' | |
|
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579 if n is None: |
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580 n = -1 |
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581 while True: |
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582 if n < 0: |
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583 data = self.read1(n) |
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584 elif n > len(buf): |
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585 data = self.read1(n - len(buf)) |
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586 else: |
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587 return buf |
| 21 | 588 if len(data) == 0: |
| 589 return buf | |
| 590 buf += data | |
| 591 | |
|
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592 def _update_crc(self, newdata, eof): |
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593 # Update the CRC using the given data. |
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594 if self._expected_crc is None: |
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595 # No need to compute the CRC if we don't have a reference value |
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596 return |
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597 self._running_crc = crc32(newdata, self._running_crc) & 0xffffffff |
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598 # Check the CRC if we're at the end of the file |
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599 if eof and self._running_crc != self._expected_crc: |
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600 raise BadZipfile("Bad CRC-32 for file %r" % self.name) |
| 21 | 601 |
| 602 def read1(self, n): | |
| 603 """Read up to n bytes with at most one read() system call.""" | |
| 604 | |
| 605 # Simplify algorithm (branching) by transforming negative n to large n. | |
| 606 if n < 0 or n is None: | |
| 607 n = self.MAX_N | |
| 608 | |
| 609 # Bytes available in read buffer. | |
| 610 len_readbuffer = len(self._readbuffer) - self._offset | |
| 611 | |
| 612 # Read from file. | |
| 613 if self._compress_left > 0 and n > len_readbuffer + len(self._unconsumed): | |
| 614 nbytes = n - len_readbuffer - len(self._unconsumed) | |
| 615 nbytes = max(nbytes, self.MIN_READ_SIZE) | |
| 616 nbytes = min(nbytes, self._compress_left) | |
| 617 | |
| 618 data = self._fileobj.read(nbytes) | |
| 619 self._compress_left -= len(data) | |
| 620 | |
| 621 if data and self._decrypter is not None: | |
| 622 data = ''.join(map(self._decrypter, data)) | |
| 623 | |
| 624 if self._compress_type == ZIP_STORED: | |
|
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625 self._update_crc(data, eof=(self._compress_left==0)) |
| 21 | 626 self._readbuffer = self._readbuffer[self._offset:] + data |
| 627 self._offset = 0 | |
| 628 else: | |
| 629 # Prepare deflated bytes for decompression. | |
| 630 self._unconsumed += data | |
| 631 | |
| 632 # Handle unconsumed data. | |
| 633 if (len(self._unconsumed) > 0 and n > len_readbuffer and | |
| 634 self._compress_type == ZIP_DEFLATED): | |
| 635 data = self._decompressor.decompress( | |
| 636 self._unconsumed, | |
| 637 max(n - len_readbuffer, self.MIN_READ_SIZE) | |
| 638 ) | |
| 639 | |
| 640 self._unconsumed = self._decompressor.unconsumed_tail | |
|
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641 eof = len(self._unconsumed) == 0 and self._compress_left == 0 |
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642 if eof: |
| 21 | 643 data += self._decompressor.flush() |
| 644 | |
|
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645 self._update_crc(data, eof=eof) |
| 21 | 646 self._readbuffer = self._readbuffer[self._offset:] + data |
| 647 self._offset = 0 | |
| 648 elif (len(self._unconsumed) > 0 and n > len_readbuffer and | |
| 649 self._compress_type == ZIP_BZIP2): | |
| 650 data = self._decompressor.decompress(self._unconsumed) | |
| 651 | |
| 652 self._unconsumed = '' | |
| 653 self._readbuffer = self._readbuffer[self._offset:] + data | |
| 654 self._offset = 0 | |
| 655 | |
| 656 # Read from buffer. | |
| 657 data = self._readbuffer[self._offset: self._offset + n] | |
| 658 self._offset += len(data) | |
| 659 return data | |
| 660 | |
| 661 | |
| 662 | |
| 663 class ZipFile: | |
| 664 """ Class with methods to open, read, write, close, list zip files. | |
| 665 | |
| 666 z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=False) | |
| 667 | |
| 668 file: Either the path to the file, or a file-like object. | |
| 669 If it is a path, the file will be opened and closed by ZipFile. | |
| 670 mode: The mode can be either read "r", write "w" or append "a". | |
| 671 compression: ZIP_STORED (no compression), ZIP_DEFLATED (requires zlib), | |
| 672 or ZIP_BZIP2 (requires bz2). | |
| 673 allowZip64: if True ZipFile will create files with ZIP64 extensions when | |
| 674 needed, otherwise it will raise an exception when this would | |
| 675 be necessary. | |
| 676 | |
| 677 """ | |
| 678 | |
| 679 fp = None # Set here since __del__ checks it | |
| 680 | |
| 681 def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=False): | |
| 682 """Open the ZIP file with mode read "r", write "w" or append "a".""" | |
| 683 if mode not in ("r", "w", "a"): | |
| 684 raise RuntimeError('ZipFile() requires mode "r", "w", or "a"') | |
| 685 | |
| 686 if compression == ZIP_STORED: | |
| 687 pass | |
| 688 elif compression == ZIP_DEFLATED: | |
| 689 if not zlib: | |
| 690 raise RuntimeError,\ | |
| 691 "Compression requires the (missing) zlib module" | |
| 692 elif compression == ZIP_BZIP2: | |
| 693 if not bz2: | |
| 694 raise RuntimeError,\ | |
| 695 "Compression requires the (missing) bz2 module" | |
| 696 else: | |
| 697 raise RuntimeError, "That compression method is not supported" | |
| 698 | |
| 699 self._allowZip64 = allowZip64 | |
| 700 self._didModify = False | |
| 701 self.debug = 0 # Level of printing: 0 through 3 | |
| 702 self.NameToInfo = {} # Find file info given name | |
| 703 self.filelist = [] # List of ZipInfo instances for archive | |
| 704 self.compression = compression # Method of compression | |
| 705 self.mode = key = mode.replace('b', '')[0] | |
| 706 self.pwd = None | |
| 707 self.comment = '' | |
| 708 | |
| 709 # Check if we were passed a file-like object | |
| 710 if isinstance(file, basestring): | |
| 711 self._filePassed = 0 | |
| 712 self.filename = file | |
| 713 modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'} | |
| 714 try: | |
| 715 self.fp = open(file, modeDict[mode]) | |
| 716 except IOError: | |
| 717 if mode == 'a': | |
| 718 mode = key = 'w' | |
| 719 self.fp = open(file, modeDict[mode]) | |
| 720 else: | |
| 721 raise | |
| 722 else: | |
| 723 self._filePassed = 1 | |
| 724 self.fp = file | |
| 725 self.filename = getattr(file, 'name', None) | |
| 726 | |
| 727 if key == 'r': | |
| 728 self._GetContents() | |
| 729 elif key == 'w': | |
| 730 pass | |
| 731 elif key == 'a': | |
| 732 try: # See if file is a zip file | |
| 733 self._RealGetContents() | |
| 734 # seek to start of directory and overwrite | |
| 735 self.fp.seek(self.start_dir, 0) | |
| 736 except BadZipfile: # file is not a zip file, just append | |
| 737 self.fp.seek(0, 2) | |
| 738 else: | |
| 739 if not self._filePassed: | |
| 740 self.fp.close() | |
| 741 self.fp = None | |
| 742 raise RuntimeError, 'Mode must be "r", "w" or "a"' | |
| 743 | |
| 744 def __enter__(self): | |
| 745 return self | |
| 746 | |
| 747 def __exit__(self, type, value, traceback): | |
| 748 self.close() | |
| 749 | |
| 750 def _GetContents(self): | |
| 751 """Read the directory, making sure we close the file if the format | |
| 752 is bad.""" | |
| 753 try: | |
| 754 self._RealGetContents() | |
| 755 except BadZipfile: | |
| 756 if not self._filePassed: | |
| 757 self.fp.close() | |
| 758 self.fp = None | |
| 759 raise | |
| 760 | |
| 761 def _RealGetContents(self): | |
| 762 """Read in the table of contents for the ZIP file.""" | |
| 763 fp = self.fp | |
| 764 endrec = _EndRecData(fp) | |
| 765 if not endrec: | |
| 766 raise BadZipfile, "File is not a zip file" | |
| 767 if self.debug > 1: | |
| 768 print endrec | |
| 769 size_cd = endrec[_ECD_SIZE] # bytes in central directory | |
| 770 offset_cd = endrec[_ECD_OFFSET] # offset of central directory | |
| 771 self.comment = endrec[_ECD_COMMENT] # archive comment | |
| 772 | |
| 773 # "concat" is zero, unless zip was concatenated to another file | |
| 774 concat = endrec[_ECD_LOCATION] - size_cd - offset_cd | |
| 775 if endrec[_ECD_SIGNATURE] == stringEndArchive64: | |
| 776 # If Zip64 extension structures are present, account for them | |
| 777 concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator) | |
| 778 | |
| 779 if self.debug > 2: | |
| 780 inferred = concat + offset_cd | |
| 781 print "given, inferred, offset", offset_cd, inferred, concat | |
| 782 # self.start_dir: Position of start of central directory | |
| 783 self.start_dir = offset_cd + concat | |
| 784 fp.seek(self.start_dir, 0) | |
| 785 data = fp.read(size_cd) | |
| 786 fp = cStringIO.StringIO(data) | |
| 787 total = 0 | |
| 788 while total < size_cd: | |
| 789 centdir = fp.read(sizeCentralDir) | |
| 790 if centdir[0:4] != stringCentralDir: | |
| 791 raise BadZipfile, "Bad magic number for central directory" | |
| 792 centdir = struct.unpack(structCentralDir, centdir) | |
| 793 if self.debug > 2: | |
| 794 print centdir | |
| 795 filename = fp.read(centdir[_CD_FILENAME_LENGTH]) | |
| 796 # Create ZipInfo instance to store file information | |
| 797 x = ZipInfo(filename) | |
| 798 x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH]) | |
| 799 x.comment = fp.read(centdir[_CD_COMMENT_LENGTH]) | |
| 800 x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET] | |
| 801 (x.create_version, x.create_system, x.extract_version, x.reserved, | |
| 802 x.flag_bits, x.compress_type, t, d, | |
| 803 x.CRC, x.compress_size, x.file_size) = centdir[1:12] | |
| 804 x.volume, x.internal_attr, x.external_attr = centdir[15:18] | |
| 805 # Convert date/time code to (year, month, day, hour, min, sec) | |
| 806 x._raw_time = t | |
| 807 x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F, | |
| 808 t>>11, (t>>5)&0x3F, (t&0x1F) * 2 ) | |
| 809 | |
| 810 x._decodeExtra() | |
| 811 x.header_offset = x.header_offset + concat | |
| 812 x.filename = x._decodeFilename() | |
| 813 self.filelist.append(x) | |
| 814 self.NameToInfo[x.filename] = x | |
| 815 | |
| 816 # update total bytes read from central directory | |
| 817 total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH] | |
| 818 + centdir[_CD_EXTRA_FIELD_LENGTH] | |
| 819 + centdir[_CD_COMMENT_LENGTH]) | |
| 820 | |
| 821 if self.debug > 2: | |
| 822 print "total", total | |
| 823 | |
| 824 | |
| 825 def namelist(self): | |
| 826 """Return a list of file names in the archive.""" | |
| 827 l = [] | |
| 828 for data in self.filelist: | |
| 829 l.append(data.filename) | |
| 830 return l | |
| 831 | |
| 832 def infolist(self): | |
| 833 """Return a list of class ZipInfo instances for files in the | |
| 834 archive.""" | |
| 835 return self.filelist | |
| 836 | |
| 837 def printdir(self): | |
| 838 """Print a table of contents for the zip file.""" | |
| 839 print "%-46s %19s %12s" % ("File Name", "Modified ", "Size") | |
| 840 for zinfo in self.filelist: | |
| 841 date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6] | |
| 842 print "%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size) | |
| 843 | |
| 844 def testzip(self): | |
| 845 """Read all the files and check the CRC.""" | |
| 846 chunk_size = 2 ** 20 | |
| 847 for zinfo in self.filelist: | |
| 848 try: | |
| 849 # Read by chunks, to avoid an OverflowError or a | |
| 850 # MemoryError with very large embedded files. | |
| 851 f = self.open(zinfo.filename, "r") | |
| 852 while f.read(chunk_size): # Check CRC-32 | |
| 853 pass | |
| 854 except BadZipfile: | |
| 855 return zinfo.filename | |
| 856 | |
| 857 def getinfo(self, name): | |
| 858 """Return the instance of ZipInfo given 'name'.""" | |
| 859 info = self.NameToInfo.get(name) | |
| 860 if info is None: | |
| 861 raise KeyError( | |
| 862 'There is no item named %r in the archive' % name) | |
| 863 | |
| 864 return info | |
| 865 | |
| 866 def setpassword(self, pwd): | |
| 867 """Set default password for encrypted files.""" | |
| 868 self.pwd = pwd | |
| 869 | |
| 870 def read(self, name, pwd=None): | |
| 871 """Return file bytes (as a string) for name.""" | |
| 872 return self.open(name, "r", pwd).read() | |
| 873 | |
| 874 def open(self, name, mode="r", pwd=None): | |
| 875 """Return file-like object for 'name'.""" | |
| 876 if mode not in ("r", "U", "rU"): | |
| 877 raise RuntimeError, 'open() requires mode "r", "U", or "rU"' | |
| 878 if not self.fp: | |
| 879 raise RuntimeError, \ | |
| 880 "Attempt to read ZIP archive that was already closed" | |
| 881 | |
| 882 # Only open a new file for instances where we were not | |
| 883 # given a file object in the constructor | |
| 884 if self._filePassed: | |
| 885 zef_file = self.fp | |
| 886 else: | |
| 887 zef_file = open(self.filename, 'rb') | |
| 888 | |
| 889 # Make sure we have an info object | |
| 890 if isinstance(name, ZipInfo): | |
| 891 # 'name' is already an info object | |
| 892 zinfo = name | |
| 893 else: | |
| 894 # Get info object for name | |
| 895 zinfo = self.getinfo(name) | |
| 896 | |
| 897 zef_file.seek(zinfo.header_offset, 0) | |
| 898 | |
| 899 # Skip the file header: | |
| 900 fheader = zef_file.read(sizeFileHeader) | |
| 901 if fheader[0:4] != stringFileHeader: | |
| 902 raise BadZipfile, "Bad magic number for file header" | |
| 903 | |
| 904 fheader = struct.unpack(structFileHeader, fheader) | |
| 905 fname = zef_file.read(fheader[_FH_FILENAME_LENGTH]) | |
| 906 if fheader[_FH_EXTRA_FIELD_LENGTH]: | |
| 907 zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH]) | |
| 908 | |
| 909 if fname != zinfo.orig_filename: | |
| 910 raise BadZipfile, \ | |
| 911 'File name in directory "%s" and header "%s" differ.' % ( | |
| 912 zinfo.orig_filename, fname) | |
| 913 | |
| 914 # check for encrypted flag & handle password | |
| 915 is_encrypted = zinfo.flag_bits & 0x1 | |
| 916 zd = None | |
| 917 if is_encrypted: | |
| 918 if not pwd: | |
| 919 pwd = self.pwd | |
| 920 if not pwd: | |
| 921 raise RuntimeError, "File %s is encrypted, " \ | |
| 922 "password required for extraction" % name | |
| 923 | |
| 924 zd = _ZipDecrypter(pwd) | |
| 925 # The first 12 bytes in the cypher stream is an encryption header | |
| 926 # used to strengthen the algorithm. The first 11 bytes are | |
| 927 # completely random, while the 12th contains the MSB of the CRC, | |
| 928 # or the MSB of the file time depending on the header type | |
| 929 # and is used to check the correctness of the password. | |
| 930 bytes = zef_file.read(12) | |
| 931 h = map(zd, bytes[0:12]) | |
| 932 if zinfo.flag_bits & 0x8: | |
| 933 # compare against the file type from extended local headers | |
| 934 check_byte = (zinfo._raw_time >> 8) & 0xff | |
| 935 else: | |
| 936 # compare against the CRC otherwise | |
| 937 check_byte = (zinfo.CRC >> 24) & 0xff | |
| 938 if ord(h[11]) != check_byte: | |
| 939 raise RuntimeError("Bad password for file", name) | |
| 940 | |
| 941 return ZipExtFile(zef_file, mode, zinfo, zd) | |
| 942 | |
| 943 def extract(self, member, path=None, pwd=None): | |
| 944 """Extract a member from the archive to the current working directory, | |
| 945 using its full name. Its file information is extracted as accurately | |
| 946 as possible. `member' may be a filename or a ZipInfo object. You can | |
| 947 specify a different directory using `path'. | |
| 948 """ | |
| 949 if not isinstance(member, ZipInfo): | |
| 950 member = self.getinfo(member) | |
| 951 | |
| 952 if path is None: | |
| 953 path = os.getcwd() | |
| 954 | |
| 955 return self._extract_member(member, path, pwd) | |
| 956 | |
| 957 def extractall(self, path=None, members=None, pwd=None): | |
| 958 """Extract all members from the archive to the current working | |
| 959 directory. `path' specifies a different directory to extract to. | |
| 960 `members' is optional and must be a subset of the list returned | |
| 961 by namelist(). | |
| 962 """ | |
| 963 if members is None: | |
| 964 members = self.namelist() | |
| 965 | |
| 966 for zipinfo in members: | |
| 967 self.extract(zipinfo, path, pwd) | |
| 968 | |
| 969 def _extract_member(self, member, targetpath, pwd): | |
| 970 """Extract the ZipInfo object 'member' to a physical | |
| 971 file on the path targetpath. | |
| 972 """ | |
| 973 # build the destination pathname, replacing | |
| 974 # forward slashes to platform specific separators. | |
| 975 # Strip trailing path separator, unless it represents the root. | |
| 976 if (targetpath[-1:] in (os.path.sep, os.path.altsep) | |
| 977 and len(os.path.splitdrive(targetpath)[1]) > 1): | |
| 978 targetpath = targetpath[:-1] | |
| 979 | |
| 980 # don't include leading "/" from file name if present | |
| 981 if member.filename[0] == '/': | |
| 982 targetpath = os.path.join(targetpath, member.filename[1:]) | |
| 983 else: | |
| 984 targetpath = os.path.join(targetpath, member.filename) | |
| 985 | |
| 986 targetpath = os.path.normpath(targetpath) | |
| 987 | |
| 988 # Create all upper directories if necessary. | |
| 989 upperdirs = os.path.dirname(targetpath) | |
| 990 if upperdirs and not os.path.exists(upperdirs): | |
| 991 os.makedirs(upperdirs) | |
| 992 | |
| 993 if member.filename[-1] == '/': | |
| 994 if not os.path.isdir(targetpath): | |
| 995 os.mkdir(targetpath) | |
| 996 return targetpath | |
| 997 | |
| 998 source = self.open(member, pwd=pwd) | |
| 999 target = file(targetpath, "wb") | |
| 1000 shutil.copyfileobj(source, target) | |
| 1001 source.close() | |
| 1002 target.close() | |
| 1003 | |
| 1004 return targetpath | |
| 1005 | |
| 1006 def _writecheck(self, zinfo): | |
| 1007 """Check for errors before writing a file to the archive.""" | |
| 1008 if zinfo.filename in self.NameToInfo: | |
| 1009 if self.debug: # Warning for duplicate names | |
| 1010 print "Duplicate name:", zinfo.filename | |
| 1011 if self.mode not in ("w", "a"): | |
| 1012 raise RuntimeError, 'write() requires mode "w" or "a"' | |
| 1013 if not self.fp: | |
| 1014 raise RuntimeError, \ | |
| 1015 "Attempt to write ZIP archive that was already closed" | |
| 1016 if zinfo.compress_type == ZIP_DEFLATED and not zlib: | |
| 1017 raise RuntimeError, \ | |
| 1018 "Compression requires the (missing) zlib module" | |
| 1019 if zinfo.compress_type == ZIP_BZIP2 and not bz2: | |
| 1020 raise RuntimeError, \ | |
| 1021 "Compression requires the (missing) bz2 module" | |
| 1022 if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED, ZIP_BZIP2): | |
| 1023 raise RuntimeError, \ | |
| 1024 "That compression method is not supported" | |
| 1025 if zinfo.file_size > ZIP64_LIMIT: | |
| 1026 if not self._allowZip64: | |
| 1027 raise LargeZipFile("Filesize would require ZIP64 extensions") | |
| 1028 if zinfo.header_offset > ZIP64_LIMIT: | |
| 1029 if not self._allowZip64: | |
| 1030 raise LargeZipFile("Zipfile size would require ZIP64 extensions") | |
| 1031 | |
| 1032 def write(self, filename, arcname=None, compress_type=None): | |
| 1033 """Put the bytes from filename into the archive under the name | |
| 1034 arcname.""" | |
| 1035 if not self.fp: | |
| 1036 raise RuntimeError( | |
| 1037 "Attempt to write to ZIP archive that was already closed") | |
| 1038 | |
| 1039 st = os.stat(filename) | |
| 1040 isdir = stat.S_ISDIR(st.st_mode) | |
| 1041 mtime = time.localtime(st.st_mtime) | |
| 1042 date_time = mtime[0:6] | |
| 1043 # Create ZipInfo instance to store file information | |
| 1044 if arcname is None: | |
| 1045 arcname = filename | |
| 1046 arcname = os.path.normpath(os.path.splitdrive(arcname)[1]) | |
| 1047 while arcname[0] in (os.sep, os.altsep): | |
| 1048 arcname = arcname[1:] | |
| 1049 if isdir: | |
| 1050 arcname += '/' | |
| 1051 zinfo = ZipInfo(arcname, date_time) | |
| 1052 zinfo.external_attr = (st[0] & 0xFFFF) << 16L # Unix attributes | |
| 1053 if compress_type is None: | |
| 1054 zinfo.compress_type = self.compression | |
| 1055 else: | |
| 1056 zinfo.compress_type = compress_type | |
| 1057 | |
| 1058 zinfo.file_size = st.st_size | |
| 1059 zinfo.flag_bits = 0x00 | |
| 1060 zinfo.header_offset = self.fp.tell() # Start of header bytes | |
| 1061 | |
| 1062 self._writecheck(zinfo) | |
| 1063 self._didModify = True | |
| 1064 | |
| 1065 if isdir: | |
| 1066 zinfo.file_size = 0 | |
| 1067 zinfo.compress_size = 0 | |
| 1068 zinfo.CRC = 0 | |
| 1069 self.filelist.append(zinfo) | |
| 1070 self.NameToInfo[zinfo.filename] = zinfo | |
| 1071 self.fp.write(zinfo.FileHeader()) | |
| 1072 return | |
| 1073 | |
| 1074 with open(filename, "rb") as fp: | |
| 1075 # Must overwrite CRC and sizes with correct data later | |
| 1076 zinfo.CRC = CRC = 0 | |
| 1077 zinfo.compress_size = compress_size = 0 | |
| 1078 zinfo.file_size = file_size = 0 | |
| 1079 self.fp.write(zinfo.FileHeader()) | |
| 1080 if zinfo.compress_type == ZIP_DEFLATED: | |
| 1081 cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, | |
| 1082 zlib.DEFLATED, -15) | |
| 1083 elif zinfo.compress_type == ZIP_BZIP2: | |
| 1084 cmpr = bz2.BZ2Compressor() | |
| 1085 else: | |
| 1086 cmpr = None | |
| 1087 while 1: | |
| 1088 buf = fp.read(1024 * 8) | |
| 1089 if not buf: | |
| 1090 break | |
| 1091 file_size = file_size + len(buf) | |
| 1092 CRC = crc32(buf, CRC) & 0xffffffff | |
| 1093 if cmpr: | |
| 1094 buf = cmpr.compress(buf) | |
| 1095 compress_size = compress_size + len(buf) | |
| 1096 self.fp.write(buf) | |
| 1097 if cmpr: | |
| 1098 buf = cmpr.flush() | |
| 1099 compress_size = compress_size + len(buf) | |
| 1100 self.fp.write(buf) | |
| 1101 zinfo.compress_size = compress_size | |
| 1102 else: | |
| 1103 zinfo.compress_size = file_size | |
| 1104 zinfo.CRC = CRC | |
| 1105 zinfo.file_size = file_size | |
| 1106 # Seek backwards and write CRC and file sizes | |
| 1107 position = self.fp.tell() # Preserve current position in file | |
| 1108 self.fp.seek(zinfo.header_offset + 14, 0) | |
| 1109 self.fp.write(struct.pack("<LLL", zinfo.CRC, zinfo.compress_size, | |
| 1110 zinfo.file_size)) | |
| 1111 self.fp.seek(position, 0) | |
| 1112 self.filelist.append(zinfo) | |
| 1113 self.NameToInfo[zinfo.filename] = zinfo | |
| 1114 | |
| 1115 def writestr(self, zinfo_or_arcname, bytes, compress_type=None): | |
| 1116 """Write a file into the archive. The contents is the string | |
| 1117 'bytes'. 'zinfo_or_arcname' is either a ZipInfo instance or | |
| 1118 the name of the file in the archive.""" | |
| 1119 if not isinstance(zinfo_or_arcname, ZipInfo): | |
| 1120 zinfo = ZipInfo(filename=zinfo_or_arcname, | |
| 1121 date_time=time.localtime(time.time())[:6]) | |
| 1122 | |
| 1123 zinfo.compress_type = self.compression | |
| 1124 zinfo.external_attr = 0600 << 16 | |
| 1125 else: | |
| 1126 zinfo = zinfo_or_arcname | |
| 1127 | |
| 1128 if not self.fp: | |
| 1129 raise RuntimeError( | |
| 1130 "Attempt to write to ZIP archive that was already closed") | |
| 1131 | |
| 1132 if compress_type is not None: | |
| 1133 zinfo.compress_type = compress_type | |
| 1134 | |
| 1135 zinfo.file_size = len(bytes) # Uncompressed size | |
| 1136 zinfo.header_offset = self.fp.tell() # Start of header bytes | |
| 1137 self._writecheck(zinfo) | |
| 1138 self._didModify = True | |
| 1139 zinfo.CRC = crc32(bytes) & 0xffffffff # CRC-32 checksum | |
| 1140 if zinfo.compress_type == ZIP_DEFLATED: | |
| 1141 co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, | |
| 1142 zlib.DEFLATED, -15) | |
| 1143 bytes = co.compress(bytes) + co.flush() | |
| 1144 zinfo.compress_size = len(bytes) # Compressed size | |
| 1145 elif zinfo.compress_type == ZIP_BZIP2: | |
| 1146 co = bz2.BZ2Compressor() | |
| 1147 bytes = co.compress(bytes) + co.flush() | |
| 1148 zinfo.compress_size = len(bytes) # Compressed size | |
| 1149 else: | |
| 1150 zinfo.compress_size = zinfo.file_size | |
| 1151 zinfo.header_offset = self.fp.tell() # Start of header bytes | |
| 1152 self.fp.write(zinfo.FileHeader()) | |
| 1153 self.fp.write(bytes) | |
| 1154 self.fp.flush() | |
| 1155 if zinfo.flag_bits & 0x08: | |
| 1156 # Write CRC and file sizes after the file data | |
| 1157 self.fp.write(struct.pack("<LLL", zinfo.CRC, zinfo.compress_size, | |
| 1158 zinfo.file_size)) | |
| 1159 self.filelist.append(zinfo) | |
| 1160 self.NameToInfo[zinfo.filename] = zinfo | |
| 1161 | |
| 1162 def __del__(self): | |
| 1163 """Call the "close()" method in case the user forgot.""" | |
| 1164 self.close() | |
| 1165 | |
| 1166 def close(self): | |
| 1167 """Close the file, and for mode "w" and "a" write the ending | |
| 1168 records.""" | |
| 1169 if self.fp is None: | |
| 1170 return | |
| 1171 | |
| 1172 if self.mode in ("w", "a") and self._didModify: # write ending records | |
| 1173 count = 0 | |
| 1174 pos1 = self.fp.tell() | |
| 1175 for zinfo in self.filelist: # write central directory | |
| 1176 count = count + 1 | |
| 1177 dt = zinfo.date_time | |
| 1178 dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2] | |
| 1179 dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2) | |
| 1180 extra = [] | |
| 1181 if zinfo.file_size > ZIP64_LIMIT \ | |
| 1182 or zinfo.compress_size > ZIP64_LIMIT: | |
| 1183 extra.append(zinfo.file_size) | |
| 1184 extra.append(zinfo.compress_size) | |
| 1185 file_size = 0xffffffff | |
| 1186 compress_size = 0xffffffff | |
| 1187 else: | |
| 1188 file_size = zinfo.file_size | |
| 1189 compress_size = zinfo.compress_size | |
| 1190 | |
| 1191 if zinfo.header_offset > ZIP64_LIMIT: | |
| 1192 extra.append(zinfo.header_offset) | |
| 1193 header_offset = 0xffffffffL | |
| 1194 else: | |
| 1195 header_offset = zinfo.header_offset | |
| 1196 | |
| 1197 extra_data = zinfo.extra | |
| 1198 if extra: | |
| 1199 # Append a ZIP64 field to the extra's | |
| 1200 extra_data = struct.pack( | |
| 1201 '<HH' + 'Q'*len(extra), | |
| 1202 1, 8*len(extra), *extra) + extra_data | |
| 1203 | |
| 1204 extract_version = max(45, zinfo.extract_version) | |
| 1205 create_version = max(45, zinfo.create_version) | |
| 1206 else: | |
| 1207 extract_version = zinfo.extract_version | |
| 1208 create_version = zinfo.create_version | |
| 1209 | |
| 1210 try: | |
| 1211 filename, flag_bits = zinfo._encodeFilenameFlags() | |
| 1212 centdir = struct.pack(structCentralDir, | |
| 1213 stringCentralDir, create_version, | |
| 1214 zinfo.create_system, extract_version, zinfo.reserved, | |
| 1215 flag_bits, zinfo.compress_type, dostime, dosdate, | |
| 1216 zinfo.CRC, compress_size, file_size, | |
| 1217 len(filename), len(extra_data), len(zinfo.comment), | |
| 1218 0, zinfo.internal_attr, zinfo.external_attr, | |
| 1219 header_offset) | |
| 1220 except DeprecationWarning: | |
| 1221 print >>sys.stderr, (structCentralDir, | |
| 1222 stringCentralDir, create_version, | |
| 1223 zinfo.create_system, extract_version, zinfo.reserved, | |
| 1224 zinfo.flag_bits, zinfo.compress_type, dostime, dosdate, | |
| 1225 zinfo.CRC, compress_size, file_size, | |
| 1226 len(zinfo.filename), len(extra_data), len(zinfo.comment), | |
| 1227 0, zinfo.internal_attr, zinfo.external_attr, | |
| 1228 header_offset) | |
| 1229 raise | |
| 1230 self.fp.write(centdir) | |
| 1231 self.fp.write(filename) | |
| 1232 self.fp.write(extra_data) | |
| 1233 self.fp.write(zinfo.comment) | |
| 1234 | |
| 1235 pos2 = self.fp.tell() | |
| 1236 # Write end-of-zip-archive record | |
| 1237 centDirCount = count | |
| 1238 centDirSize = pos2 - pos1 | |
| 1239 centDirOffset = pos1 | |
| 1240 if (centDirCount >= ZIP_FILECOUNT_LIMIT or | |
| 1241 centDirOffset > ZIP64_LIMIT or | |
| 1242 centDirSize > ZIP64_LIMIT): | |
| 1243 # Need to write the ZIP64 end-of-archive records | |
| 1244 zip64endrec = struct.pack( | |
| 1245 structEndArchive64, stringEndArchive64, | |
| 1246 44, 45, 45, 0, 0, centDirCount, centDirCount, | |
| 1247 centDirSize, centDirOffset) | |
| 1248 self.fp.write(zip64endrec) | |
| 1249 | |
| 1250 zip64locrec = struct.pack( | |
| 1251 structEndArchive64Locator, | |
| 1252 stringEndArchive64Locator, 0, pos2, 1) | |
| 1253 self.fp.write(zip64locrec) | |
| 1254 centDirCount = min(centDirCount, 0xFFFF) | |
| 1255 centDirSize = min(centDirSize, 0xFFFFFFFF) | |
| 1256 centDirOffset = min(centDirOffset, 0xFFFFFFFF) | |
| 1257 | |
| 1258 # check for valid comment length | |
| 1259 if len(self.comment) >= ZIP_MAX_COMMENT: | |
| 1260 if self.debug > 0: | |
| 1261 msg = 'Archive comment is too long; truncating to %d bytes' \ | |
| 1262 % ZIP_MAX_COMMENT | |
| 1263 self.comment = self.comment[:ZIP_MAX_COMMENT] | |
| 1264 | |
| 1265 endrec = struct.pack(structEndArchive, stringEndArchive, | |
| 1266 0, 0, centDirCount, centDirCount, | |
| 1267 centDirSize, centDirOffset, len(self.comment)) | |
| 1268 self.fp.write(endrec) | |
| 1269 self.fp.write(self.comment) | |
| 1270 self.fp.flush() | |
| 1271 | |
| 1272 if not self._filePassed: | |
| 1273 self.fp.close() | |
| 1274 self.fp = None | |
| 1275 | |
| 1276 | |
| 1277 class PyZipFile(ZipFile): | |
| 1278 """Class to create ZIP archives with Python library files and packages.""" | |
| 1279 | |
| 1280 def writepy(self, pathname, basename = ""): | |
| 1281 """Add all files from "pathname" to the ZIP archive. | |
| 1282 | |
| 1283 If pathname is a package directory, search the directory and | |
| 1284 all package subdirectories recursively for all *.py and enter | |
| 1285 the modules into the archive. If pathname is a plain | |
| 1286 directory, listdir *.py and enter all modules. Else, pathname | |
| 1287 must be a Python *.py file and the module will be put into the | |
| 1288 archive. Added modules are always module.pyo or module.pyc. | |
| 1289 This method will compile the module.py into module.pyc if | |
| 1290 necessary. | |
| 1291 """ | |
| 1292 dir, name = os.path.split(pathname) | |
| 1293 if os.path.isdir(pathname): | |
| 1294 initname = os.path.join(pathname, "__init__.py") | |
| 1295 if os.path.isfile(initname): | |
| 1296 # This is a package directory, add it | |
| 1297 if basename: | |
| 1298 basename = "%s/%s" % (basename, name) | |
| 1299 else: | |
| 1300 basename = name | |
| 1301 if self.debug: | |
| 1302 print "Adding package in", pathname, "as", basename | |
| 1303 fname, arcname = self._get_codename(initname[0:-3], basename) | |
| 1304 if self.debug: | |
| 1305 print "Adding", arcname | |
| 1306 self.write(fname, arcname) | |
| 1307 dirlist = os.listdir(pathname) | |
| 1308 dirlist.remove("__init__.py") | |
| 1309 # Add all *.py files and package subdirectories | |
| 1310 for filename in dirlist: | |
| 1311 path = os.path.join(pathname, filename) | |
| 1312 root, ext = os.path.splitext(filename) | |
| 1313 if os.path.isdir(path): | |
| 1314 if os.path.isfile(os.path.join(path, "__init__.py")): | |
| 1315 # This is a package directory, add it | |
| 1316 self.writepy(path, basename) # Recursive call | |
| 1317 elif ext == ".py": | |
| 1318 fname, arcname = self._get_codename(path[0:-3], | |
| 1319 basename) | |
| 1320 if self.debug: | |
| 1321 print "Adding", arcname | |
| 1322 self.write(fname, arcname) | |
| 1323 else: | |
| 1324 # This is NOT a package directory, add its files at top level | |
| 1325 if self.debug: | |
| 1326 print "Adding files from directory", pathname | |
| 1327 for filename in os.listdir(pathname): | |
| 1328 path = os.path.join(pathname, filename) | |
| 1329 root, ext = os.path.splitext(filename) | |
| 1330 if ext == ".py": | |
| 1331 fname, arcname = self._get_codename(path[0:-3], | |
| 1332 basename) | |
| 1333 if self.debug: | |
| 1334 print "Adding", arcname | |
| 1335 self.write(fname, arcname) | |
| 1336 else: | |
| 1337 if pathname[-3:] != ".py": | |
| 1338 raise RuntimeError, \ | |
| 1339 'Files added with writepy() must end with ".py"' | |
| 1340 fname, arcname = self._get_codename(pathname[0:-3], basename) | |
| 1341 if self.debug: | |
| 1342 print "Adding file", arcname | |
| 1343 self.write(fname, arcname) | |
| 1344 | |
| 1345 def _get_codename(self, pathname, basename): | |
| 1346 """Return (filename, archivename) for the path. | |
| 1347 | |
| 1348 Given a module name path, return the correct file path and | |
| 1349 archive name, compiling if necessary. For example, given | |
| 1350 /python/lib/string, return (/python/lib/string.pyc, string). | |
| 1351 """ | |
| 1352 file_py = pathname + ".py" | |
| 1353 file_pyc = pathname + ".pyc" | |
| 1354 file_pyo = pathname + ".pyo" | |
| 1355 if os.path.isfile(file_pyo) and \ | |
| 1356 os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime: | |
| 1357 fname = file_pyo # Use .pyo file | |
| 1358 elif not os.path.isfile(file_pyc) or \ | |
| 1359 os.stat(file_pyc).st_mtime < os.stat(file_py).st_mtime: | |
| 1360 import py_compile | |
| 1361 if self.debug: | |
| 1362 print "Compiling", file_py | |
| 1363 try: | |
| 1364 py_compile.compile(file_py, file_pyc, None, True) | |
| 1365 except py_compile.PyCompileError,err: | |
| 1366 print err.msg | |
| 1367 fname = file_pyc | |
| 1368 else: | |
| 1369 fname = file_pyc | |
| 1370 archivename = os.path.split(fname)[1] | |
| 1371 if basename: | |
| 1372 archivename = "%s/%s" % (basename, archivename) | |
| 1373 return (fname, archivename) | |
| 1374 | |
| 1375 | |
| 1376 def main(args = None): | |
| 1377 import textwrap | |
| 1378 USAGE=textwrap.dedent("""\ | |
| 1379 Usage: | |
| 1380 zipfile.py -l zipfile.zip # Show listing of a zipfile | |
| 1381 zipfile.py -t zipfile.zip # Test if a zipfile is valid | |
| 1382 zipfile.py -e zipfile.zip target # Extract zipfile into target dir | |
| 1383 zipfile.py -c zipfile.zip src ... # Create zipfile from sources | |
| 1384 """) | |
| 1385 if args is None: | |
| 1386 args = sys.argv[1:] | |
| 1387 | |
| 1388 if not args or args[0] not in ('-l', '-c', '-e', '-t'): | |
| 1389 print USAGE | |
| 1390 sys.exit(1) | |
| 1391 | |
| 1392 if args[0] == '-l': | |
| 1393 if len(args) != 2: | |
| 1394 print USAGE | |
| 1395 sys.exit(1) | |
| 1396 zf = ZipFile(args[1], 'r') | |
| 1397 zf.printdir() | |
| 1398 zf.close() | |
| 1399 | |
| 1400 elif args[0] == '-t': | |
| 1401 if len(args) != 2: | |
| 1402 print USAGE | |
| 1403 sys.exit(1) | |
| 1404 zf = ZipFile(args[1], 'r') | |
|
29
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
1405 badfile = zf.testzip() |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
1406 if badfile: |
|
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
21
diff
changeset
|
1407 print("The following enclosed file is corrupted: {!r}".format(badfile)) |
| 21 | 1408 print "Done testing" |
| 1409 | |
| 1410 elif args[0] == '-e': | |
| 1411 if len(args) != 3: | |
| 1412 print USAGE | |
| 1413 sys.exit(1) | |
| 1414 | |
| 1415 zf = ZipFile(args[1], 'r') | |
| 1416 out = args[2] | |
| 1417 for path in zf.namelist(): | |
| 1418 if path.startswith('./'): | |
| 1419 tgt = os.path.join(out, path[2:]) | |
| 1420 else: | |
| 1421 tgt = os.path.join(out, path) | |
| 1422 | |
| 1423 tgtdir = os.path.dirname(tgt) | |
| 1424 if not os.path.exists(tgtdir): | |
| 1425 os.makedirs(tgtdir) | |
| 1426 with open(tgt, 'wb') as fp: | |
| 1427 fp.write(zf.read(path)) | |
| 1428 zf.close() | |
| 1429 | |
| 1430 elif args[0] == '-c': | |
| 1431 if len(args) < 3: | |
| 1432 print USAGE | |
| 1433 sys.exit(1) | |
| 1434 | |
| 1435 def addToZip(zf, path, zippath): | |
| 1436 if os.path.isfile(path): | |
| 1437 zf.write(path, zippath, ZIP_DEFLATED) | |
| 1438 elif os.path.isdir(path): | |
| 1439 for nm in os.listdir(path): | |
| 1440 addToZip(zf, | |
| 1441 os.path.join(path, nm), os.path.join(zippath, nm)) | |
| 1442 # else: ignore | |
| 1443 | |
| 1444 zf = ZipFile(args[1], 'w', allowZip64=True) | |
| 1445 for src in args[2:]: | |
| 1446 addToZip(zf, src, os.path.basename(src)) | |
| 1447 | |
| 1448 zf.close() | |
| 1449 | |
| 1450 if __name__ == "__main__": | |
| 1451 main() |