/usr/lib/thunderbird-devel/config/MozZipFile.py is in thunderbird-dev 1:52.8.0-1~deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | # This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
import os
import time
import zipfile
from mozbuild.util import lock_file
class ZipFile(zipfile.ZipFile):
""" Class with methods to open, read, write, close, list zip files.
Subclassing zipfile.ZipFile to allow for overwriting of existing
entries, though only for writestr, not for write.
"""
def __init__(self, file, mode="r", compression=zipfile.ZIP_STORED,
lock = False):
if lock:
assert isinstance(file, basestring)
self.lockfile = lock_file(file + '.lck')
else:
self.lockfile = None
if mode == 'a' and lock:
# appending to a file which doesn't exist fails, but we can't check
# existence util we hold the lock
if (not os.path.isfile(file)) or os.path.getsize(file) == 0:
mode = 'w'
zipfile.ZipFile.__init__(self, file, mode, compression)
self._remove = []
self.end = self.fp.tell()
self.debug = 0
def writestr(self, zinfo_or_arcname, bytes):
"""Write contents into the archive.
The contents is the argument 'bytes', 'zinfo_or_arcname' is either
a ZipInfo instance or the name of the file in the archive.
This method is overloaded to allow overwriting existing entries.
"""
if not isinstance(zinfo_or_arcname, zipfile.ZipInfo):
zinfo = zipfile.ZipInfo(filename=zinfo_or_arcname,
date_time=time.localtime(time.time()))
zinfo.compress_type = self.compression
# Add some standard UNIX file access permissions (-rw-r--r--).
zinfo.external_attr = (0x81a4 & 0xFFFF) << 16L
else:
zinfo = zinfo_or_arcname
# Now to the point why we overwrote this in the first place,
# remember the entry numbers if we already had this entry.
# Optimizations:
# If the entry to overwrite is the last one, just reuse that.
# If we store uncompressed and the new content has the same size
# as the old, reuse the existing entry.
doSeek = False # store if we need to seek to the eof after overwriting
if self.NameToInfo.has_key(zinfo.filename):
# Find the last ZipInfo with our name.
# Last, because that's catching multiple overwrites
i = len(self.filelist)
while i > 0:
i -= 1
if self.filelist[i].filename == zinfo.filename:
break
zi = self.filelist[i]
if ((zinfo.compress_type == zipfile.ZIP_STORED
and zi.compress_size == len(bytes))
or (i + 1) == len(self.filelist)):
# make sure we're allowed to write, otherwise done by writestr below
self._writecheck(zi)
# overwrite existing entry
self.fp.seek(zi.header_offset)
if (i + 1) == len(self.filelist):
# this is the last item in the file, just truncate
self.fp.truncate()
else:
# we need to move to the end of the file afterwards again
doSeek = True
# unhook the current zipinfo, the writestr of our superclass
# will add a new one
self.filelist.pop(i)
self.NameToInfo.pop(zinfo.filename)
else:
# Couldn't optimize, sadly, just remember the old entry for removal
self._remove.append(self.filelist.pop(i))
zipfile.ZipFile.writestr(self, zinfo, bytes)
self.filelist.sort(lambda l, r: cmp(l.header_offset, r.header_offset))
if doSeek:
self.fp.seek(self.end)
self.end = self.fp.tell()
def close(self):
"""Close the file, and for mode "w" and "a" write the ending
records.
Overwritten to compact overwritten entries.
"""
if not self._remove:
# we don't have anything special to do, let's just call base
r = zipfile.ZipFile.close(self)
self.lockfile = None
return r
if self.fp.mode != 'r+b':
# adjust file mode if we originally just wrote, now we rewrite
self.fp.close()
self.fp = open(self.filename, 'r+b')
all = map(lambda zi: (zi, True), self.filelist) + \
map(lambda zi: (zi, False), self._remove)
all.sort(lambda l, r: cmp(l[0].header_offset, r[0].header_offset))
# empty _remove for multiple closes
self._remove = []
lengths = [all[i+1][0].header_offset - all[i][0].header_offset
for i in xrange(len(all)-1)]
lengths.append(self.end - all[-1][0].header_offset)
to_pos = 0
for (zi, keep), length in zip(all, lengths):
if not keep:
continue
oldoff = zi.header_offset
# python <= 2.4 has file_offset
if hasattr(zi, 'file_offset'):
zi.file_offset = zi.file_offset + to_pos - oldoff
zi.header_offset = to_pos
self.fp.seek(oldoff)
content = self.fp.read(length)
self.fp.seek(to_pos)
self.fp.write(content)
to_pos += length
self.fp.truncate()
zipfile.ZipFile.close(self)
self.lockfile = None
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