Mercurial > ~astiob > upreckon > hgweb
annotate zipfiles/zipfile31.py @ 157:5f9e6121161a
Second attempt to work around unwarranted ERROR_ACCESS_DENIED on Windows
Also fixed an indentation error in win32 apparently caused by a bug
in my text editor.
author | Oleg Oshmyan <chortos@inbox.lv> |
---|---|
date | Wed, 08 Jun 2011 20:53:26 +0100 (2011-06-08) |
parents | 45d4a9dc707b |
children | b993d9257400 |
rev | line source |
---|---|
21 | 1 """ |
2 Read and write ZIP files. | |
3 | |
4 XXX references to utf-8 need further investigation. | |
5 """ | |
6 # Improved by Chortos-2 in 2010 (added bzip2 support) | |
7 import struct, os, time, sys, shutil | |
8 import binascii, io, stat | |
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 = b"<4s4H2LH" | |
56 stringEndArchive = b"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 = b"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 = b"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 = b"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 = b"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 """ | |
32
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
168 try: |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
169 fpin.seek(offset - sizeEndCentDir64Locator, 2) |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
170 except IOError: |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
171 # If the seek fails, the file is not large enough to contain a ZIP64 |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
172 # end-of-archive record, so just return the end record we were given. |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
173 return endrec |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
174 |
21 | 175 data = fpin.read(sizeEndCentDir64Locator) |
176 sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data) | |
177 if sig != stringEndArchive64Locator: | |
178 return endrec | |
179 | |
180 if diskno != 0 or disks != 1: | |
181 raise BadZipfile("zipfiles that span multiple disks are not supported") | |
182 | |
183 # Assume no 'zip64 extensible data' | |
184 fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2) | |
185 data = fpin.read(sizeEndCentDir64) | |
186 sig, sz, create_version, read_version, disk_num, disk_dir, \ | |
187 dircount, dircount2, dirsize, diroffset = \ | |
188 struct.unpack(structEndArchive64, data) | |
189 if sig != stringEndArchive64: | |
190 return endrec | |
191 | |
192 # Update the original endrec using data from the ZIP64 record | |
193 endrec[_ECD_SIGNATURE] = sig | |
194 endrec[_ECD_DISK_NUMBER] = disk_num | |
195 endrec[_ECD_DISK_START] = disk_dir | |
196 endrec[_ECD_ENTRIES_THIS_DISK] = dircount | |
197 endrec[_ECD_ENTRIES_TOTAL] = dircount2 | |
198 endrec[_ECD_SIZE] = dirsize | |
199 endrec[_ECD_OFFSET] = diroffset | |
200 return endrec | |
201 | |
202 | |
203 def _EndRecData(fpin): | |
204 """Return data from the "End of Central Directory" record, or None. | |
205 | |
206 The data is a list of the nine items in the ZIP "End of central dir" | |
207 record followed by a tenth item, the file seek offset of this record.""" | |
208 | |
209 # Determine file size | |
210 fpin.seek(0, 2) | |
211 filesize = fpin.tell() | |
212 | |
213 # Check to see if this is ZIP file with no archive comment (the | |
214 # "end of central directory" structure should be the last item in the | |
215 # file if this is the case). | |
216 try: | |
217 fpin.seek(-sizeEndCentDir, 2) | |
218 except IOError: | |
219 return None | |
220 data = fpin.read() | |
221 if data[0:4] == stringEndArchive and data[-2:] == b"\000\000": | |
222 # the signature is correct and there's no comment, unpack structure | |
223 endrec = struct.unpack(structEndArchive, data) | |
224 endrec=list(endrec) | |
225 | |
226 # Append a blank comment and record start offset | |
227 endrec.append(b"") | |
228 endrec.append(filesize - sizeEndCentDir) | |
229 | |
230 # Try to read the "Zip64 end of central directory" structure | |
231 return _EndRecData64(fpin, -sizeEndCentDir, endrec) | |
232 | |
233 # Either this is not a ZIP file, or it is a ZIP file with an archive | |
234 # comment. Search the end of the file for the "end of central directory" | |
235 # record signature. The comment is the last item in the ZIP file and may be | |
236 # up to 64K long. It is assumed that the "end of central directory" magic | |
237 # number does not appear in the comment. | |
238 maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0) | |
239 fpin.seek(maxCommentStart, 0) | |
240 data = fpin.read() | |
241 start = data.rfind(stringEndArchive) | |
242 if start >= 0: | |
243 # found the magic number; attempt to unpack and interpret | |
244 recData = data[start:start+sizeEndCentDir] | |
245 endrec = list(struct.unpack(structEndArchive, recData)) | |
246 comment = data[start+sizeEndCentDir:] | |
247 # check that comment length is correct | |
248 if endrec[_ECD_COMMENT_SIZE] == len(comment): | |
249 # Append the archive comment and start offset | |
250 endrec.append(comment) | |
251 endrec.append(maxCommentStart + start) | |
252 | |
253 # Try to read the "Zip64 end of central directory" structure | |
254 return _EndRecData64(fpin, maxCommentStart + start - filesize, | |
255 endrec) | |
256 | |
257 # Unable to find a valid end of central directory structure | |
258 return | |
259 | |
260 | |
261 class ZipInfo (object): | |
262 """Class with attributes describing each file in the ZIP archive.""" | |
263 | |
264 __slots__ = ( | |
265 'orig_filename', | |
266 'filename', | |
267 'date_time', | |
268 'compress_type', | |
269 'comment', | |
270 'extra', | |
271 'create_system', | |
272 'create_version', | |
273 'extract_version', | |
274 'reserved', | |
275 'flag_bits', | |
276 'volume', | |
277 'internal_attr', | |
278 'external_attr', | |
279 'header_offset', | |
280 'CRC', | |
281 'compress_size', | |
282 'file_size', | |
283 '_raw_time', | |
284 ) | |
285 | |
286 def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)): | |
287 self.orig_filename = filename # Original file name in archive | |
288 | |
289 # Terminate the file name at the first null byte. Null bytes in file | |
290 # names are used as tricks by viruses in archives. | |
291 null_byte = filename.find(chr(0)) | |
292 if null_byte >= 0: | |
293 filename = filename[0:null_byte] | |
294 # This is used to ensure paths in generated ZIP files always use | |
295 # forward slashes as the directory separator, as required by the | |
296 # ZIP format specification. | |
297 if os.sep != "/" and os.sep in filename: | |
298 filename = filename.replace(os.sep, "/") | |
299 | |
300 self.filename = filename # Normalized file name | |
301 self.date_time = date_time # year, month, day, hour, min, sec | |
302 # Standard values: | |
303 self.compress_type = ZIP_STORED # Type of compression for the file | |
304 self.comment = b"" # Comment for each file | |
305 self.extra = b"" # ZIP extra data | |
306 if sys.platform == 'win32': | |
307 self.create_system = 0 # System which created ZIP archive | |
308 else: | |
309 # Assume everything else is unix-y | |
310 self.create_system = 3 # System which created ZIP archive | |
311 self.create_version = 20 # Version which created ZIP archive | |
312 self.extract_version = 20 # Version needed to extract archive | |
313 self.reserved = 0 # Must be zero | |
314 self.flag_bits = 0 # ZIP flag bits | |
315 self.volume = 0 # Volume number of file header | |
316 self.internal_attr = 0 # Internal attributes | |
317 self.external_attr = 0 # External file attributes | |
318 # Other attributes are set by class ZipFile: | |
319 # header_offset Byte offset to the file header | |
320 # CRC CRC-32 of the uncompressed file | |
321 # compress_size Size of the compressed file | |
322 # file_size Size of the uncompressed file | |
323 | |
324 def FileHeader(self): | |
325 """Return the per-file header as a string.""" | |
326 dt = self.date_time | |
327 dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2] | |
328 dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2) | |
329 if self.flag_bits & 0x08: | |
330 # Set these to zero because we write them after the file data | |
331 CRC = compress_size = file_size = 0 | |
332 else: | |
333 CRC = self.CRC | |
334 compress_size = self.compress_size | |
335 file_size = self.file_size | |
336 | |
337 extra = self.extra | |
338 | |
339 if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT: | |
340 # File is larger than what fits into a 4 byte integer, | |
341 # fall back to the ZIP64 extension | |
342 fmt = '<HHQQ' | |
343 extra = extra + struct.pack(fmt, | |
344 1, struct.calcsize(fmt)-4, file_size, compress_size) | |
345 file_size = 0xffffffff | |
346 compress_size = 0xffffffff | |
347 self.extract_version = max(45, self.extract_version) | |
348 self.create_version = max(45, self.extract_version) | |
349 | |
350 filename, flag_bits = self._encodeFilenameFlags() | |
351 header = struct.pack(structFileHeader, stringFileHeader, | |
352 self.extract_version, self.reserved, flag_bits, | |
353 self.compress_type, dostime, dosdate, CRC, | |
354 compress_size, file_size, | |
355 len(filename), len(extra)) | |
356 return header + filename + extra | |
357 | |
358 def _encodeFilenameFlags(self): | |
359 try: | |
360 return self.filename.encode('ascii'), self.flag_bits | |
361 except UnicodeEncodeError: | |
362 return self.filename.encode('utf-8'), self.flag_bits | 0x800 | |
363 | |
364 def _decodeExtra(self): | |
365 # Try to decode the extra field. | |
366 extra = self.extra | |
367 unpack = struct.unpack | |
368 while extra: | |
369 tp, ln = unpack('<HH', extra[:4]) | |
370 if tp == 1: | |
371 if ln >= 24: | |
372 counts = unpack('<QQQ', extra[4:28]) | |
373 elif ln == 16: | |
374 counts = unpack('<QQ', extra[4:20]) | |
375 elif ln == 8: | |
376 counts = unpack('<Q', extra[4:12]) | |
377 elif ln == 0: | |
378 counts = () | |
379 else: | |
380 raise RuntimeError("Corrupt extra field %s"%(ln,)) | |
381 | |
382 idx = 0 | |
383 | |
384 # ZIP64 extension (large files and/or large archives) | |
385 if self.file_size in (0xffffffffffffffff, 0xffffffff): | |
386 self.file_size = counts[idx] | |
387 idx += 1 | |
388 | |
389 if self.compress_size == 0xFFFFFFFF: | |
390 self.compress_size = counts[idx] | |
391 idx += 1 | |
392 | |
393 if self.header_offset == 0xffffffff: | |
394 old = self.header_offset | |
395 self.header_offset = counts[idx] | |
396 idx+=1 | |
397 | |
398 extra = extra[ln+4:] | |
399 | |
400 | |
401 class _ZipDecrypter: | |
402 """Class to handle decryption of files stored within a ZIP archive. | |
403 | |
404 ZIP supports a password-based form of encryption. Even though known | |
405 plaintext attacks have been found against it, it is still useful | |
406 to be able to get data out of such a file. | |
407 | |
408 Usage: | |
409 zd = _ZipDecrypter(mypwd) | |
410 plain_char = zd(cypher_char) | |
411 plain_text = map(zd, cypher_text) | |
412 """ | |
413 | |
414 def _GenerateCRCTable(): | |
415 """Generate a CRC-32 table. | |
416 | |
417 ZIP encryption uses the CRC32 one-byte primitive for scrambling some | |
418 internal keys. We noticed that a direct implementation is faster than | |
419 relying on binascii.crc32(). | |
420 """ | |
421 poly = 0xedb88320 | |
422 table = [0] * 256 | |
423 for i in range(256): | |
424 crc = i | |
425 for j in range(8): | |
426 if crc & 1: | |
427 crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly | |
428 else: | |
429 crc = ((crc >> 1) & 0x7FFFFFFF) | |
430 table[i] = crc | |
431 return table | |
432 crctable = _GenerateCRCTable() | |
433 | |
434 def _crc32(self, ch, crc): | |
435 """Compute the CRC32 primitive on one byte.""" | |
436 return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ch) & 0xff] | |
437 | |
438 def __init__(self, pwd): | |
439 self.key0 = 305419896 | |
440 self.key1 = 591751049 | |
441 self.key2 = 878082192 | |
442 for p in pwd: | |
443 self._UpdateKeys(p) | |
444 | |
445 def _UpdateKeys(self, c): | |
446 self.key0 = self._crc32(c, self.key0) | |
447 self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295 | |
448 self.key1 = (self.key1 * 134775813 + 1) & 4294967295 | |
449 self.key2 = self._crc32((self.key1 >> 24) & 255, self.key2) | |
450 | |
451 def __call__(self, c): | |
452 """Decrypt a single character.""" | |
453 assert isinstance(c, int) | |
454 k = self.key2 | 2 | |
455 c = c ^ (((k * (k^1)) >> 8) & 255) | |
456 self._UpdateKeys(c) | |
457 return c | |
458 | |
459 class ZipExtFile: | |
460 """File-like object for reading an archive member. | |
461 Is returned by ZipFile.open(). | |
462 """ | |
463 | |
464 def __init__(self, fileobj, zipinfo, decrypt=None): | |
465 self.fileobj = fileobj | |
466 self.decrypter = decrypt | |
467 self.bytes_read = 0 | |
468 self.rawbuffer = b'' | |
469 self.readbuffer = b'' | |
470 self.linebuffer = b'' | |
471 self.eof = False | |
472 self.univ_newlines = False | |
473 self.nlSeps = (b"\n", ) | |
474 self.lastdiscard = b'' | |
475 | |
476 self.compress_type = zipinfo.compress_type | |
477 self.compress_size = zipinfo.compress_size | |
478 | |
479 self.closed = False | |
480 self.mode = "r" | |
481 self.name = zipinfo.filename | |
482 | |
483 # read from compressed files in 64k blocks | |
484 self.compreadsize = 64*1024 | |
485 if self.compress_type == ZIP_DEFLATED: | |
486 self.dc = zlib.decompressobj(-15) | |
487 elif self.compress_type == ZIP_BZIP2: | |
488 self.dc = bz2.BZ2Decompressor() | |
489 self.compreadsize = 900000 | |
490 | |
29
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
491 if hasattr(zipinfo, 'CRC'): |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
492 self._expected_crc = zipinfo.CRC |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
493 self._running_crc = crc32(b'') & 0xffffffff |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
494 else: |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
495 self._expected_crc = None |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
496 |
21 | 497 def set_univ_newlines(self, univ_newlines): |
498 self.univ_newlines = univ_newlines | |
499 | |
500 # pick line separator char(s) based on universal newlines flag | |
501 self.nlSeps = (b"\n", ) | |
502 if self.univ_newlines: | |
503 self.nlSeps = (b"\r\n", b"\r", b"\n") | |
504 | |
505 def __iter__(self): | |
506 return self | |
507 | |
508 def __next__(self): | |
509 nextline = self.readline() | |
510 if not nextline: | |
511 raise StopIteration() | |
512 | |
513 return nextline | |
514 | |
515 def close(self): | |
516 self.closed = True | |
517 | |
518 def _checkfornewline(self): | |
519 nl, nllen = -1, -1 | |
520 if self.linebuffer: | |
521 # ugly check for cases where half of an \r\n pair was | |
522 # read on the last pass, and the \r was discarded. In this | |
523 # case we just throw away the \n at the start of the buffer. | |
524 if (self.lastdiscard, self.linebuffer[:1]) == (b'\r', b'\n'): | |
525 self.linebuffer = self.linebuffer[1:] | |
526 | |
527 for sep in self.nlSeps: | |
528 nl = self.linebuffer.find(sep) | |
529 if nl >= 0: | |
530 nllen = len(sep) | |
531 return nl, nllen | |
532 | |
533 return nl, nllen | |
534 | |
535 def readline(self, size = -1): | |
536 """Read a line with approx. size. If size is negative, | |
537 read a whole line. | |
538 """ | |
539 if size < 0: | |
540 size = sys.maxsize | |
541 elif size == 0: | |
542 return b'' | |
543 | |
544 # check for a newline already in buffer | |
545 nl, nllen = self._checkfornewline() | |
546 | |
547 if nl >= 0: | |
548 # the next line was already in the buffer | |
549 nl = min(nl, size) | |
550 else: | |
551 # no line break in buffer - try to read more | |
552 size -= len(self.linebuffer) | |
553 while nl < 0 and size > 0: | |
554 buf = self.read(min(size, 100)) | |
555 if not buf: | |
556 break | |
557 self.linebuffer += buf | |
558 size -= len(buf) | |
559 | |
560 # check for a newline in buffer | |
561 nl, nllen = self._checkfornewline() | |
562 | |
563 # we either ran out of bytes in the file, or | |
564 # met the specified size limit without finding a newline, | |
565 # so return current buffer | |
566 if nl < 0: | |
567 s = self.linebuffer | |
568 self.linebuffer = b'' | |
569 return s | |
570 | |
571 buf = self.linebuffer[:nl] | |
572 self.lastdiscard = self.linebuffer[nl:nl + nllen] | |
573 self.linebuffer = self.linebuffer[nl + nllen:] | |
574 | |
575 # line is always returned with \n as newline char (except possibly | |
576 # for a final incomplete line in the file, which is handled above). | |
577 return buf + b"\n" | |
578 | |
579 def readlines(self, sizehint = -1): | |
580 """Return a list with all (following) lines. The sizehint parameter | |
581 is ignored in this implementation. | |
582 """ | |
583 result = [] | |
584 while True: | |
585 line = self.readline() | |
586 if not line: break | |
587 result.append(line) | |
588 return result | |
589 | |
29
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
590 def _update_crc(self, newdata, eof): |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
591 # Update the CRC using the given data. |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
592 if self._expected_crc is None: |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
593 # No need to compute the CRC if we don't have a reference value |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
594 return |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
595 self._running_crc = crc32(newdata, self._running_crc) & 0xffffffff |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
596 # Check the CRC if we're at the end of the file |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
597 if eof and self._running_crc != self._expected_crc: |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
598 raise BadZipfile("Bad CRC-32 for file %r" % self.name) |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
599 |
21 | 600 def read(self, size = None): |
601 # act like file obj and return empty string if size is 0 | |
602 if size == 0: | |
603 return b'' | |
604 | |
605 # determine read size | |
606 bytesToRead = self.compress_size - self.bytes_read | |
607 | |
608 # adjust read size for encrypted files since the first 12 bytes | |
609 # are for the encryption/password information | |
610 if self.decrypter is not None: | |
611 bytesToRead -= 12 | |
612 | |
613 if size is not None and size >= 0: | |
614 if self.compress_type == ZIP_STORED: | |
615 lr = len(self.readbuffer) | |
616 bytesToRead = min(bytesToRead, size - lr) | |
617 else: | |
618 if len(self.readbuffer) > size: | |
619 # the user has requested fewer bytes than we've already | |
620 # pulled through the decompressor; don't read any more | |
621 bytesToRead = 0 | |
622 else: | |
623 # user will use up the buffer, so read some more | |
624 lr = len(self.rawbuffer) | |
625 bytesToRead = min(bytesToRead, self.compreadsize - lr) | |
626 | |
627 # avoid reading past end of file contents | |
628 if bytesToRead + self.bytes_read > self.compress_size: | |
629 bytesToRead = self.compress_size - self.bytes_read | |
630 | |
631 # try to read from file (if necessary) | |
632 if bytesToRead > 0: | |
633 data = self.fileobj.read(bytesToRead) | |
634 self.bytes_read += len(data) | |
635 try: | |
636 self.rawbuffer += data | |
637 except: | |
638 print(repr(self.fileobj), repr(self.rawbuffer), | |
639 repr(data)) | |
640 raise | |
641 | |
642 # handle contents of raw buffer | |
643 if self.rawbuffer: | |
644 newdata = self.rawbuffer | |
645 self.rawbuffer = b'' | |
646 | |
647 # decrypt new data if we were given an object to handle that | |
648 if newdata and self.decrypter is not None: | |
649 newdata = bytes(map(self.decrypter, newdata)) | |
650 | |
651 # decompress newly read data if necessary | |
652 if newdata and self.compress_type != ZIP_STORED: | |
653 newdata = self.dc.decompress(newdata) | |
654 self.rawbuffer = self.dc.unconsumed_tail if self.compress_type == ZIP_DEFLATED else '' | |
655 if self.eof and len(self.rawbuffer) == 0: | |
656 # we're out of raw bytes (both from the file and | |
657 # the local buffer); flush just to make sure the | |
658 # decompressor is done | |
28 | 659 try: |
21 | 660 newdata += self.dc.flush() |
28 | 661 except AttributeError: |
662 pass | |
21 | 663 # prevent decompressor from being used again |
664 self.dc = None | |
665 | |
29
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
666 self._update_crc(newdata, eof=( |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
667 self.compress_size == self.bytes_read and |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
668 len(self.rawbuffer) == 0)) |
21 | 669 self.readbuffer += newdata |
670 | |
671 # return what the user asked for | |
672 if size is None or len(self.readbuffer) <= size: | |
673 data = self.readbuffer | |
674 self.readbuffer = b'' | |
675 else: | |
676 data = self.readbuffer[:size] | |
677 self.readbuffer = self.readbuffer[size:] | |
678 | |
679 return data | |
680 | |
681 | |
682 class ZipFile: | |
683 """ Class with methods to open, read, write, close, list zip files. | |
684 | |
685 z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=False) | |
686 | |
687 file: Either the path to the file, or a file-like object. | |
688 If it is a path, the file will be opened and closed by ZipFile. | |
689 mode: The mode can be either read "r", write "w" or append "a". | |
690 compression: ZIP_STORED (no compression), ZIP_DEFLATED (requires zlib), | |
691 or ZIP_BZIP2 (requires bz2). | |
692 allowZip64: if True ZipFile will create files with ZIP64 extensions when | |
693 needed, otherwise it will raise an exception when this would | |
694 be necessary. | |
695 | |
696 """ | |
697 | |
698 fp = None # Set here since __del__ checks it | |
699 | |
700 def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=False): | |
701 """Open the ZIP file with mode read "r", write "w" or append "a".""" | |
702 if mode not in ("r", "w", "a"): | |
703 raise RuntimeError('ZipFile() requires mode "r", "w", or "a"') | |
704 | |
705 if compression == ZIP_STORED: | |
706 pass | |
707 elif compression == ZIP_DEFLATED: | |
708 if not zlib: | |
709 raise RuntimeError( | |
710 "Compression requires the (missing) zlib module") | |
711 elif compression == ZIP_BZIP2: | |
712 if not bz2: | |
713 raise RuntimeError( | |
714 "Compression requires the (missing) bz2 module") | |
715 else: | |
716 raise RuntimeError("That compression method is not supported") | |
717 | |
718 self._allowZip64 = allowZip64 | |
719 self._didModify = False | |
720 self.debug = 0 # Level of printing: 0 through 3 | |
721 self.NameToInfo = {} # Find file info given name | |
722 self.filelist = [] # List of ZipInfo instances for archive | |
723 self.compression = compression # Method of compression | |
724 self.mode = key = mode.replace('b', '')[0] | |
725 self.pwd = None | |
726 self.comment = b'' | |
727 | |
728 # Check if we were passed a file-like object | |
729 if isinstance(file, str): | |
730 # No, it's a filename | |
731 self._filePassed = 0 | |
732 self.filename = file | |
733 modeDict = {'r' : 'rb', 'w': 'wb', 'a' : 'r+b'} | |
734 try: | |
735 self.fp = io.open(file, modeDict[mode]) | |
736 except IOError: | |
737 if mode == 'a': | |
738 mode = key = 'w' | |
739 self.fp = io.open(file, modeDict[mode]) | |
740 else: | |
741 raise | |
742 else: | |
743 self._filePassed = 1 | |
744 self.fp = file | |
745 self.filename = getattr(file, 'name', None) | |
746 | |
747 if key == 'r': | |
748 self._GetContents() | |
749 elif key == 'w': | |
32
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
750 # set the modified flag so central directory gets written |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
751 # even if no files are added to the archive |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
752 self._didModify = True |
21 | 753 elif key == 'a': |
32
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
754 try: |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
755 # See if file is a zip file |
21 | 756 self._RealGetContents() |
757 # seek to start of directory and overwrite | |
758 self.fp.seek(self.start_dir, 0) | |
32
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
759 except BadZipfile: |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
760 # file is not a zip file, just append |
21 | 761 self.fp.seek(0, 2) |
32
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
762 |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
763 # set the modified flag so central directory gets written |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
764 # even if no files are added to the archive |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
765 self._didModify = True |
21 | 766 else: |
767 if not self._filePassed: | |
768 self.fp.close() | |
769 self.fp = None | |
770 raise RuntimeError('Mode must be "r", "w" or "a"') | |
771 | |
772 def _GetContents(self): | |
773 """Read the directory, making sure we close the file if the format | |
774 is bad.""" | |
775 try: | |
776 self._RealGetContents() | |
777 except BadZipfile: | |
778 if not self._filePassed: | |
779 self.fp.close() | |
780 self.fp = None | |
781 raise | |
782 | |
783 def _RealGetContents(self): | |
784 """Read in the table of contents for the ZIP file.""" | |
785 fp = self.fp | |
32
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
786 try: |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
787 endrec = _EndRecData(fp) |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
788 except IOError: |
3000bb94addb
Updated zipfile to 2.7.1 and 3.1.3 final releases.
Oleg Oshmyan <chortos@inbox.lv>
parents:
29
diff
changeset
|
789 raise BadZipfile("File is not a zip file") |
21 | 790 if not endrec: |
791 raise BadZipfile("File is not a zip file") | |
792 if self.debug > 1: | |
793 print(endrec) | |
794 size_cd = endrec[_ECD_SIZE] # bytes in central directory | |
795 offset_cd = endrec[_ECD_OFFSET] # offset of central directory | |
796 self.comment = endrec[_ECD_COMMENT] # archive comment | |
797 | |
798 # "concat" is zero, unless zip was concatenated to another file | |
799 concat = endrec[_ECD_LOCATION] - size_cd - offset_cd | |
800 if endrec[_ECD_SIGNATURE] == stringEndArchive64: | |
801 # If Zip64 extension structures are present, account for them | |
802 concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator) | |
803 | |
804 if self.debug > 2: | |
805 inferred = concat + offset_cd | |
806 print("given, inferred, offset", offset_cd, inferred, concat) | |
807 # self.start_dir: Position of start of central directory | |
808 self.start_dir = offset_cd + concat | |
809 fp.seek(self.start_dir, 0) | |
810 data = fp.read(size_cd) | |
811 fp = io.BytesIO(data) | |
812 total = 0 | |
813 while total < size_cd: | |
814 centdir = fp.read(sizeCentralDir) | |
815 if centdir[0:4] != stringCentralDir: | |
816 raise BadZipfile("Bad magic number for central directory") | |
817 centdir = struct.unpack(structCentralDir, centdir) | |
818 if self.debug > 2: | |
819 print(centdir) | |
820 filename = fp.read(centdir[_CD_FILENAME_LENGTH]) | |
821 flags = centdir[5] | |
822 if flags & 0x800: | |
823 # UTF-8 file names extension | |
824 filename = filename.decode('utf-8') | |
825 else: | |
826 # Historical ZIP filename encoding | |
827 filename = filename.decode('cp437') | |
828 # Create ZipInfo instance to store file information | |
829 x = ZipInfo(filename) | |
830 x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH]) | |
831 x.comment = fp.read(centdir[_CD_COMMENT_LENGTH]) | |
832 x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET] | |
833 (x.create_version, x.create_system, x.extract_version, x.reserved, | |
834 x.flag_bits, x.compress_type, t, d, | |
835 x.CRC, x.compress_size, x.file_size) = centdir[1:12] | |
836 x.volume, x.internal_attr, x.external_attr = centdir[15:18] | |
837 # Convert date/time code to (year, month, day, hour, min, sec) | |
838 x._raw_time = t | |
839 x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F, | |
840 t>>11, (t>>5)&0x3F, (t&0x1F) * 2 ) | |
841 | |
842 x._decodeExtra() | |
843 x.header_offset = x.header_offset + concat | |
844 self.filelist.append(x) | |
845 self.NameToInfo[x.filename] = x | |
846 | |
847 # update total bytes read from central directory | |
848 total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH] | |
849 + centdir[_CD_EXTRA_FIELD_LENGTH] | |
850 + centdir[_CD_COMMENT_LENGTH]) | |
851 | |
852 if self.debug > 2: | |
853 print("total", total) | |
854 | |
855 | |
856 def namelist(self): | |
857 """Return a list of file names in the archive.""" | |
858 l = [] | |
859 for data in self.filelist: | |
860 l.append(data.filename) | |
861 return l | |
862 | |
863 def infolist(self): | |
864 """Return a list of class ZipInfo instances for files in the | |
865 archive.""" | |
866 return self.filelist | |
867 | |
868 def printdir(self, file=None): | |
869 """Print a table of contents for the zip file.""" | |
870 print("%-46s %19s %12s" % ("File Name", "Modified ", "Size"), | |
871 file=file) | |
872 for zinfo in self.filelist: | |
873 date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6] | |
874 print("%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size), | |
875 file=file) | |
876 | |
877 def testzip(self): | |
878 """Read all the files and check the CRC.""" | |
879 chunk_size = 2 ** 20 | |
880 for zinfo in self.filelist: | |
881 try: | |
882 # Read by chunks, to avoid an OverflowError or a | |
883 # MemoryError with very large embedded files. | |
884 f = self.open(zinfo.filename, "r") | |
885 while f.read(chunk_size): # Check CRC-32 | |
886 pass | |
887 except BadZipfile: | |
888 return zinfo.filename | |
889 | |
890 def getinfo(self, name): | |
891 """Return the instance of ZipInfo given 'name'.""" | |
892 info = self.NameToInfo.get(name) | |
893 if info is None: | |
894 raise KeyError( | |
895 'There is no item named %r in the archive' % name) | |
896 | |
897 return info | |
898 | |
899 def setpassword(self, pwd): | |
900 """Set default password for encrypted files.""" | |
901 assert isinstance(pwd, bytes) | |
902 self.pwd = pwd | |
903 | |
904 def read(self, name, pwd=None): | |
905 """Return file bytes (as a string) for name.""" | |
906 return self.open(name, "r", pwd).read() | |
907 | |
908 def open(self, name, mode="r", pwd=None): | |
909 """Return file-like object for 'name'.""" | |
910 if mode not in ("r", "U", "rU"): | |
911 raise RuntimeError('open() requires mode "r", "U", or "rU"') | |
912 if not self.fp: | |
913 raise RuntimeError( | |
914 "Attempt to read ZIP archive that was already closed") | |
915 | |
916 # Only open a new file for instances where we were not | |
917 # given a file object in the constructor | |
918 if self._filePassed: | |
919 zef_file = self.fp | |
920 else: | |
921 zef_file = io.open(self.filename, 'rb') | |
922 | |
923 # Make sure we have an info object | |
924 if isinstance(name, ZipInfo): | |
925 # 'name' is already an info object | |
926 zinfo = name | |
927 else: | |
928 # Get info object for name | |
929 zinfo = self.getinfo(name) | |
930 | |
931 zef_file.seek(zinfo.header_offset, 0) | |
932 | |
933 # Skip the file header: | |
934 fheader = zef_file.read(sizeFileHeader) | |
935 if fheader[0:4] != stringFileHeader: | |
936 raise BadZipfile("Bad magic number for file header") | |
937 | |
938 fheader = struct.unpack(structFileHeader, fheader) | |
939 fname = zef_file.read(fheader[_FH_FILENAME_LENGTH]) | |
940 if fheader[_FH_EXTRA_FIELD_LENGTH]: | |
941 zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH]) | |
942 | |
943 if fname != zinfo.orig_filename.encode("utf-8"): | |
944 raise BadZipfile( | |
945 'File name in directory %r and header %r differ.' | |
946 % (zinfo.orig_filename, fname)) | |
947 | |
948 # check for encrypted flag & handle password | |
949 is_encrypted = zinfo.flag_bits & 0x1 | |
950 zd = None | |
951 if is_encrypted: | |
952 if not pwd: | |
953 pwd = self.pwd | |
954 if not pwd: | |
955 raise RuntimeError("File %s is encrypted, " | |
956 "password required for extraction" % name) | |
957 | |
958 zd = _ZipDecrypter(pwd) | |
959 # The first 12 bytes in the cypher stream is an encryption header | |
960 # used to strengthen the algorithm. The first 11 bytes are | |
961 # completely random, while the 12th contains the MSB of the CRC, | |
962 # or the MSB of the file time depending on the header type | |
963 # and is used to check the correctness of the password. | |
964 bytes = zef_file.read(12) | |
965 h = list(map(zd, bytes[0:12])) | |
966 if zinfo.flag_bits & 0x8: | |
967 # compare against the file type from extended local headers | |
968 check_byte = (zinfo._raw_time >> 8) & 0xff | |
969 else: | |
970 # compare against the CRC otherwise | |
971 check_byte = (zinfo.CRC >> 24) & 0xff | |
972 if h[11] != check_byte: | |
973 raise RuntimeError("Bad password for file", name) | |
974 | |
975 # build and return a ZipExtFile | |
976 if zd is None: | |
977 zef = ZipExtFile(zef_file, zinfo) | |
978 else: | |
979 zef = ZipExtFile(zef_file, zinfo, zd) | |
980 | |
981 # set universal newlines on ZipExtFile if necessary | |
982 if "U" in mode: | |
983 zef.set_univ_newlines(True) | |
984 return zef | |
985 | |
986 def extract(self, member, path=None, pwd=None): | |
987 """Extract a member from the archive to the current working directory, | |
988 using its full name. Its file information is extracted as accurately | |
989 as possible. `member' may be a filename or a ZipInfo object. You can | |
990 specify a different directory using `path'. | |
991 """ | |
992 if not isinstance(member, ZipInfo): | |
993 member = self.getinfo(member) | |
994 | |
995 if path is None: | |
996 path = os.getcwd() | |
997 | |
998 return self._extract_member(member, path, pwd) | |
999 | |
1000 def extractall(self, path=None, members=None, pwd=None): | |
1001 """Extract all members from the archive to the current working | |
1002 directory. `path' specifies a different directory to extract to. | |
1003 `members' is optional and must be a subset of the list returned | |
1004 by namelist(). | |
1005 """ | |
1006 if members is None: | |
1007 members = self.namelist() | |
1008 | |
1009 for zipinfo in members: | |
1010 self.extract(zipinfo, path, pwd) | |
1011 | |
1012 def _extract_member(self, member, targetpath, pwd): | |
1013 """Extract the ZipInfo object 'member' to a physical | |
1014 file on the path targetpath. | |
1015 """ | |
1016 # build the destination pathname, replacing | |
1017 # forward slashes to platform specific separators. | |
1018 # Strip trailing path separator, unless it represents the root. | |
1019 if (targetpath[-1:] in (os.path.sep, os.path.altsep) | |
1020 and len(os.path.splitdrive(targetpath)[1]) > 1): | |
1021 targetpath = targetpath[:-1] | |
1022 | |
1023 # don't include leading "/" from file name if present | |
1024 if member.filename[0] == '/': | |
1025 targetpath = os.path.join(targetpath, member.filename[1:]) | |
1026 else: | |
1027 targetpath = os.path.join(targetpath, member.filename) | |
1028 | |
1029 targetpath = os.path.normpath(targetpath) | |
1030 | |
1031 # Create all upper directories if necessary. | |
1032 upperdirs = os.path.dirname(targetpath) | |
1033 if upperdirs and not os.path.exists(upperdirs): | |
1034 os.makedirs(upperdirs) | |
1035 | |
1036 if member.filename[-1] == '/': | |
1037 if not os.path.isdir(targetpath): | |
1038 os.mkdir(targetpath) | |
1039 return targetpath | |
1040 | |
1041 source = self.open(member, pwd=pwd) | |
1042 target = open(targetpath, "wb") | |
1043 shutil.copyfileobj(source, target) | |
1044 source.close() | |
1045 target.close() | |
1046 | |
1047 return targetpath | |
1048 | |
1049 def _writecheck(self, zinfo): | |
1050 """Check for errors before writing a file to the archive.""" | |
1051 if zinfo.filename in self.NameToInfo: | |
1052 if self.debug: # Warning for duplicate names | |
1053 print("Duplicate name:", zinfo.filename) | |
1054 if self.mode not in ("w", "a"): | |
1055 raise RuntimeError('write() requires mode "w" or "a"') | |
1056 if not self.fp: | |
1057 raise RuntimeError( | |
1058 "Attempt to write ZIP archive that was already closed") | |
1059 if zinfo.compress_type == ZIP_DEFLATED and not zlib: | |
1060 raise RuntimeError( | |
1061 "Compression requires the (missing) zlib module") | |
1062 if zinfo.compress_type == ZIP_BZIP2 and not bz2: | |
1063 raise RuntimeError( | |
1064 "Compression requires the (missing) bz2 module") | |
1065 if zinfo.compress_type not in (ZIP_STORED, ZIP_DEFLATED, ZIP_BZIP2): | |
1066 raise RuntimeError("That compression method is not supported") | |
1067 if zinfo.file_size > ZIP64_LIMIT: | |
1068 if not self._allowZip64: | |
1069 raise LargeZipFile("Filesize would require ZIP64 extensions") | |
1070 if zinfo.header_offset > ZIP64_LIMIT: | |
1071 if not self._allowZip64: | |
1072 raise LargeZipFile( | |
1073 "Zipfile size would require ZIP64 extensions") | |
1074 | |
1075 def write(self, filename, arcname=None, compress_type=None): | |
1076 """Put the bytes from filename into the archive under the name | |
1077 arcname.""" | |
1078 if not self.fp: | |
1079 raise RuntimeError( | |
1080 "Attempt to write to ZIP archive that was already closed") | |
1081 | |
1082 st = os.stat(filename) | |
1083 isdir = stat.S_ISDIR(st.st_mode) | |
1084 mtime = time.localtime(st.st_mtime) | |
1085 date_time = mtime[0:6] | |
1086 # Create ZipInfo instance to store file information | |
1087 if arcname is None: | |
1088 arcname = filename | |
1089 arcname = os.path.normpath(os.path.splitdrive(arcname)[1]) | |
1090 while arcname[0] in (os.sep, os.altsep): | |
1091 arcname = arcname[1:] | |
1092 if isdir: | |
1093 arcname += '/' | |
1094 zinfo = ZipInfo(arcname, date_time) | |
1095 zinfo.external_attr = (st[0] & 0xFFFF) << 16 # Unix attributes | |
1096 if compress_type is None: | |
1097 zinfo.compress_type = self.compression | |
1098 else: | |
1099 zinfo.compress_type = compress_type | |
1100 | |
1101 zinfo.file_size = st.st_size | |
1102 zinfo.flag_bits = 0x00 | |
1103 zinfo.header_offset = self.fp.tell() # Start of header bytes | |
1104 | |
1105 self._writecheck(zinfo) | |
1106 self._didModify = True | |
1107 | |
1108 if isdir: | |
1109 zinfo.file_size = 0 | |
1110 zinfo.compress_size = 0 | |
1111 zinfo.CRC = 0 | |
1112 self.filelist.append(zinfo) | |
1113 self.NameToInfo[zinfo.filename] = zinfo | |
1114 self.fp.write(zinfo.FileHeader()) | |
1115 return | |
1116 | |
1117 with open(filename, "rb") as fp: | |
1118 # Must overwrite CRC and sizes with correct data later | |
1119 zinfo.CRC = CRC = 0 | |
1120 zinfo.compress_size = compress_size = 0 | |
1121 zinfo.file_size = file_size = 0 | |
1122 self.fp.write(zinfo.FileHeader()) | |
1123 if zinfo.compress_type == ZIP_DEFLATED: | |
1124 cmpr = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, | |
1125 zlib.DEFLATED, -15) | |
1126 elif zinfo.compress_type == ZIP_BZIP2: | |
1127 cmpr = bz2.BZ2Compressor() | |
1128 else: | |
1129 cmpr = None | |
1130 while 1: | |
1131 buf = fp.read(1024 * 8) | |
1132 if not buf: | |
1133 break | |
1134 file_size = file_size + len(buf) | |
1135 CRC = crc32(buf, CRC) & 0xffffffff | |
1136 if cmpr: | |
1137 buf = cmpr.compress(buf) | |
1138 compress_size = compress_size + len(buf) | |
1139 self.fp.write(buf) | |
1140 if cmpr: | |
1141 buf = cmpr.flush() | |
1142 compress_size = compress_size + len(buf) | |
1143 self.fp.write(buf) | |
1144 zinfo.compress_size = compress_size | |
1145 else: | |
1146 zinfo.compress_size = file_size | |
1147 zinfo.CRC = CRC | |
1148 zinfo.file_size = file_size | |
1149 # Seek backwards and write CRC and file sizes | |
1150 position = self.fp.tell() # Preserve current position in file | |
1151 self.fp.seek(zinfo.header_offset + 14, 0) | |
1152 self.fp.write(struct.pack("<LLL", zinfo.CRC, zinfo.compress_size, | |
1153 zinfo.file_size)) | |
1154 self.fp.seek(position, 0) | |
1155 self.filelist.append(zinfo) | |
1156 self.NameToInfo[zinfo.filename] = zinfo | |
1157 | |
1158 def writestr(self, zinfo_or_arcname, data): | |
1159 """Write a file into the archive. The contents is 'data', which | |
1160 may be either a 'str' or a 'bytes' instance; if it is a 'str', | |
1161 it is encoded as UTF-8 first. | |
1162 'zinfo_or_arcname' is either a ZipInfo instance or | |
1163 the name of the file in the archive.""" | |
1164 if isinstance(data, str): | |
1165 data = data.encode("utf-8") | |
1166 if not isinstance(zinfo_or_arcname, ZipInfo): | |
1167 zinfo = ZipInfo(filename=zinfo_or_arcname, | |
1168 date_time=time.localtime(time.time())[:6]) | |
1169 zinfo.compress_type = self.compression | |
1170 zinfo.external_attr = 0o600 << 16 | |
1171 else: | |
1172 zinfo = zinfo_or_arcname | |
1173 | |
1174 if not self.fp: | |
1175 raise RuntimeError( | |
1176 "Attempt to write to ZIP archive that was already closed") | |
1177 | |
1178 zinfo.file_size = len(data) # Uncompressed size | |
1179 zinfo.header_offset = self.fp.tell() # Start of header data | |
1180 self._writecheck(zinfo) | |
1181 self._didModify = True | |
1182 zinfo.CRC = crc32(data) & 0xffffffff # CRC-32 checksum | |
1183 if zinfo.compress_type == ZIP_DEFLATED: | |
1184 co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, | |
1185 zlib.DEFLATED, -15) | |
1186 data = co.compress(data) + co.flush() | |
1187 zinfo.compress_size = len(data) # Compressed size | |
1188 elif zinfo.compress_type == ZIP_BZIP2: | |
1189 co = bz2.BZ2Compressor() | |
1190 data = co.compress(data) + co.flush() | |
1191 zinfo.compress_size = len(data) # Compressed size | |
1192 else: | |
1193 zinfo.compress_size = zinfo.file_size | |
1194 zinfo.header_offset = self.fp.tell() # Start of header data | |
1195 self.fp.write(zinfo.FileHeader()) | |
1196 self.fp.write(data) | |
1197 self.fp.flush() | |
1198 if zinfo.flag_bits & 0x08: | |
1199 # Write CRC and file sizes after the file data | |
1200 self.fp.write(struct.pack("<LLL", zinfo.CRC, zinfo.compress_size, | |
1201 zinfo.file_size)) | |
1202 self.filelist.append(zinfo) | |
1203 self.NameToInfo[zinfo.filename] = zinfo | |
1204 | |
1205 def __del__(self): | |
1206 """Call the "close()" method in case the user forgot.""" | |
1207 self.close() | |
1208 | |
1209 def close(self): | |
1210 """Close the file, and for mode "w" and "a" write the ending | |
1211 records.""" | |
1212 if self.fp is None: | |
1213 return | |
1214 | |
1215 if self.mode in ("w", "a") and self._didModify: # write ending records | |
1216 count = 0 | |
1217 pos1 = self.fp.tell() | |
1218 for zinfo in self.filelist: # write central directory | |
1219 count = count + 1 | |
1220 dt = zinfo.date_time | |
1221 dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2] | |
1222 dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2) | |
1223 extra = [] | |
1224 if zinfo.file_size > ZIP64_LIMIT \ | |
1225 or zinfo.compress_size > ZIP64_LIMIT: | |
1226 extra.append(zinfo.file_size) | |
1227 extra.append(zinfo.compress_size) | |
1228 file_size = 0xffffffff | |
1229 compress_size = 0xffffffff | |
1230 else: | |
1231 file_size = zinfo.file_size | |
1232 compress_size = zinfo.compress_size | |
1233 | |
1234 if zinfo.header_offset > ZIP64_LIMIT: | |
1235 extra.append(zinfo.header_offset) | |
1236 header_offset = 0xffffffff | |
1237 else: | |
1238 header_offset = zinfo.header_offset | |
1239 | |
1240 extra_data = zinfo.extra | |
1241 if extra: | |
1242 # Append a ZIP64 field to the extra's | |
1243 extra_data = struct.pack( | |
1244 '<HH' + 'Q'*len(extra), | |
1245 1, 8*len(extra), *extra) + extra_data | |
1246 | |
1247 extract_version = max(45, zinfo.extract_version) | |
1248 create_version = max(45, zinfo.create_version) | |
1249 else: | |
1250 extract_version = zinfo.extract_version | |
1251 create_version = zinfo.create_version | |
1252 | |
1253 try: | |
1254 filename, flag_bits = zinfo._encodeFilenameFlags() | |
1255 centdir = struct.pack(structCentralDir, | |
1256 stringCentralDir, create_version, | |
1257 zinfo.create_system, extract_version, zinfo.reserved, | |
1258 flag_bits, zinfo.compress_type, dostime, dosdate, | |
1259 zinfo.CRC, compress_size, file_size, | |
1260 len(filename), len(extra_data), len(zinfo.comment), | |
1261 0, zinfo.internal_attr, zinfo.external_attr, | |
1262 header_offset) | |
1263 except DeprecationWarning: | |
1264 print((structCentralDir, stringCentralDir, create_version, | |
1265 zinfo.create_system, extract_version, zinfo.reserved, | |
1266 zinfo.flag_bits, zinfo.compress_type, dostime, dosdate, | |
1267 zinfo.CRC, compress_size, file_size, | |
1268 len(zinfo.filename), len(extra_data), len(zinfo.comment), | |
1269 0, zinfo.internal_attr, zinfo.external_attr, | |
1270 header_offset), file=sys.stderr) | |
1271 raise | |
1272 self.fp.write(centdir) | |
1273 self.fp.write(filename) | |
1274 self.fp.write(extra_data) | |
1275 self.fp.write(zinfo.comment) | |
1276 | |
1277 pos2 = self.fp.tell() | |
1278 # Write end-of-zip-archive record | |
1279 centDirCount = count | |
1280 centDirSize = pos2 - pos1 | |
1281 centDirOffset = pos1 | |
1282 if (centDirCount >= ZIP_FILECOUNT_LIMIT or | |
1283 centDirOffset > ZIP64_LIMIT or | |
1284 centDirSize > ZIP64_LIMIT): | |
1285 # Need to write the ZIP64 end-of-archive records | |
1286 zip64endrec = struct.pack( | |
1287 structEndArchive64, stringEndArchive64, | |
1288 44, 45, 45, 0, 0, centDirCount, centDirCount, | |
1289 centDirSize, centDirOffset) | |
1290 self.fp.write(zip64endrec) | |
1291 | |
1292 zip64locrec = struct.pack( | |
1293 structEndArchive64Locator, | |
1294 stringEndArchive64Locator, 0, pos2, 1) | |
1295 self.fp.write(zip64locrec) | |
1296 centDirCount = min(centDirCount, 0xFFFF) | |
1297 centDirSize = min(centDirSize, 0xFFFFFFFF) | |
1298 centDirOffset = min(centDirOffset, 0xFFFFFFFF) | |
1299 | |
1300 # check for valid comment length | |
1301 if len(self.comment) >= ZIP_MAX_COMMENT: | |
1302 if self.debug > 0: | |
1303 msg = 'Archive comment is too long; truncating to %d bytes' \ | |
1304 % ZIP_MAX_COMMENT | |
1305 self.comment = self.comment[:ZIP_MAX_COMMENT] | |
1306 | |
1307 endrec = struct.pack(structEndArchive, stringEndArchive, | |
1308 0, 0, centDirCount, centDirCount, | |
1309 centDirSize, centDirOffset, len(self.comment)) | |
1310 self.fp.write(endrec) | |
1311 self.fp.write(self.comment) | |
1312 self.fp.flush() | |
1313 | |
1314 if not self._filePassed: | |
1315 self.fp.close() | |
1316 self.fp = None | |
1317 | |
1318 | |
1319 class PyZipFile(ZipFile): | |
1320 """Class to create ZIP archives with Python library files and packages.""" | |
1321 | |
1322 def writepy(self, pathname, basename=""): | |
1323 """Add all files from "pathname" to the ZIP archive. | |
1324 | |
1325 If pathname is a package directory, search the directory and | |
1326 all package subdirectories recursively for all *.py and enter | |
1327 the modules into the archive. If pathname is a plain | |
1328 directory, listdir *.py and enter all modules. Else, pathname | |
1329 must be a Python *.py file and the module will be put into the | |
1330 archive. Added modules are always module.pyo or module.pyc. | |
1331 This method will compile the module.py into module.pyc if | |
1332 necessary. | |
1333 """ | |
1334 dir, name = os.path.split(pathname) | |
1335 if os.path.isdir(pathname): | |
1336 initname = os.path.join(pathname, "__init__.py") | |
1337 if os.path.isfile(initname): | |
1338 # This is a package directory, add it | |
1339 if basename: | |
1340 basename = "%s/%s" % (basename, name) | |
1341 else: | |
1342 basename = name | |
1343 if self.debug: | |
1344 print("Adding package in", pathname, "as", basename) | |
1345 fname, arcname = self._get_codename(initname[0:-3], basename) | |
1346 if self.debug: | |
1347 print("Adding", arcname) | |
1348 self.write(fname, arcname) | |
1349 dirlist = os.listdir(pathname) | |
1350 dirlist.remove("__init__.py") | |
1351 # Add all *.py files and package subdirectories | |
1352 for filename in dirlist: | |
1353 path = os.path.join(pathname, filename) | |
1354 root, ext = os.path.splitext(filename) | |
1355 if os.path.isdir(path): | |
1356 if os.path.isfile(os.path.join(path, "__init__.py")): | |
1357 # This is a package directory, add it | |
1358 self.writepy(path, basename) # Recursive call | |
1359 elif ext == ".py": | |
1360 fname, arcname = self._get_codename(path[0:-3], | |
1361 basename) | |
1362 if self.debug: | |
1363 print("Adding", arcname) | |
1364 self.write(fname, arcname) | |
1365 else: | |
1366 # This is NOT a package directory, add its files at top level | |
1367 if self.debug: | |
1368 print("Adding files from directory", pathname) | |
1369 for filename in os.listdir(pathname): | |
1370 path = os.path.join(pathname, filename) | |
1371 root, ext = os.path.splitext(filename) | |
1372 if ext == ".py": | |
1373 fname, arcname = self._get_codename(path[0:-3], | |
1374 basename) | |
1375 if self.debug: | |
1376 print("Adding", arcname) | |
1377 self.write(fname, arcname) | |
1378 else: | |
1379 if pathname[-3:] != ".py": | |
1380 raise RuntimeError( | |
1381 'Files added with writepy() must end with ".py"') | |
1382 fname, arcname = self._get_codename(pathname[0:-3], basename) | |
1383 if self.debug: | |
1384 print("Adding file", arcname) | |
1385 self.write(fname, arcname) | |
1386 | |
1387 def _get_codename(self, pathname, basename): | |
1388 """Return (filename, archivename) for the path. | |
1389 | |
1390 Given a module name path, return the correct file path and | |
1391 archive name, compiling if necessary. For example, given | |
1392 /python/lib/string, return (/python/lib/string.pyc, string). | |
1393 """ | |
1394 file_py = pathname + ".py" | |
1395 file_pyc = pathname + ".pyc" | |
1396 file_pyo = pathname + ".pyo" | |
1397 if os.path.isfile(file_pyo) and \ | |
1398 os.stat(file_pyo).st_mtime >= os.stat(file_py).st_mtime: | |
1399 fname = file_pyo # Use .pyo file | |
1400 elif not os.path.isfile(file_pyc) or \ | |
1401 os.stat(file_pyc).st_mtime < os.stat(file_py).st_mtime: | |
1402 import py_compile | |
1403 if self.debug: | |
1404 print("Compiling", file_py) | |
1405 try: | |
1406 py_compile.compile(file_py, file_pyc, None, True) | |
1407 except py_compile.PyCompileError as err: | |
1408 print(err.msg) | |
1409 fname = file_pyc | |
1410 else: | |
1411 fname = file_pyc | |
1412 archivename = os.path.split(fname)[1] | |
1413 if basename: | |
1414 archivename = "%s/%s" % (basename, archivename) | |
1415 return (fname, archivename) | |
1416 | |
1417 | |
1418 def main(args = None): | |
1419 import textwrap | |
1420 USAGE=textwrap.dedent("""\ | |
1421 Usage: | |
1422 zipfile.py -l zipfile.zip # Show listing of a zipfile | |
1423 zipfile.py -t zipfile.zip # Test if a zipfile is valid | |
1424 zipfile.py -e zipfile.zip target # Extract zipfile into target dir | |
1425 zipfile.py -c zipfile.zip src ... # Create zipfile from sources | |
1426 """) | |
1427 if args is None: | |
1428 args = sys.argv[1:] | |
1429 | |
1430 if not args or args[0] not in ('-l', '-c', '-e', '-t'): | |
1431 print(USAGE) | |
1432 sys.exit(1) | |
1433 | |
1434 if args[0] == '-l': | |
1435 if len(args) != 2: | |
1436 print(USAGE) | |
1437 sys.exit(1) | |
1438 zf = ZipFile(args[1], 'r') | |
1439 zf.printdir() | |
1440 zf.close() | |
1441 | |
1442 elif args[0] == '-t': | |
1443 if len(args) != 2: | |
1444 print(USAGE) | |
1445 sys.exit(1) | |
1446 zf = ZipFile(args[1], 'r') | |
29
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
1447 badfile = zf.testzip() |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
1448 if badfile: |
a8cc383b787c
Clean up zipfiles and diff them to stock ones
Oleg Oshmyan <chortos@inbox.lv>
parents:
28
diff
changeset
|
1449 print("The following enclosed file is corrupted: {!r}".format(badfile)) |
21 | 1450 print("Done testing") |
1451 | |
1452 elif args[0] == '-e': | |
1453 if len(args) != 3: | |
1454 print(USAGE) | |
1455 sys.exit(1) | |
1456 | |
1457 zf = ZipFile(args[1], 'r') | |
1458 out = args[2] | |
1459 for path in zf.namelist(): | |
1460 if path.startswith('./'): | |
1461 tgt = os.path.join(out, path[2:]) | |
1462 else: | |
1463 tgt = os.path.join(out, path) | |
1464 | |
1465 tgtdir = os.path.dirname(tgt) | |
1466 if not os.path.exists(tgtdir): | |
1467 os.makedirs(tgtdir) | |
1468 with open(tgt, 'wb') as fp: | |
1469 fp.write(zf.read(path)) | |
1470 zf.close() | |
1471 | |
1472 elif args[0] == '-c': | |
1473 if len(args) < 3: | |
1474 print(USAGE) | |
1475 sys.exit(1) | |
1476 | |
1477 def addToZip(zf, path, zippath): | |
1478 if os.path.isfile(path): | |
1479 zf.write(path, zippath, ZIP_DEFLATED) | |
1480 elif os.path.isdir(path): | |
1481 for nm in os.listdir(path): | |
1482 addToZip(zf, | |
1483 os.path.join(path, nm), os.path.join(zippath, nm)) | |
1484 # else: ignore | |
1485 | |
1486 zf = ZipFile(args[1], 'w', allowZip64=True) | |
1487 for src in args[2:]: | |
1488 addToZip(zf, src, os.path.basename(src)) | |
1489 | |
1490 zf.close() | |
1491 | |
1492 if __name__ == "__main__": | |
1493 main() |