mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-30 00:01:50 +00:00
138 lines
4.9 KiB
Python
138 lines
4.9 KiB
Python
# 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
|