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164 lines
6.1 KiB
Python
164 lines
6.1 KiB
Python
# ***** BEGIN LICENSE BLOCK *****
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
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#
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# The contents of this file are subject to the Mozilla Public License Version
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# 1.1 (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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# http://www.mozilla.org/MPL/
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# for the specific language governing rights and limitations under the
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# License.
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#
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# The Original Code is Mozilla build system.
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#
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# The Initial Developer of the Original Code is
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# Mozilla Foundation.
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# Portions created by the Initial Developer are Copyright (C) 2007
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# the Initial Developer. All Rights Reserved.
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#
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# Contributor(s):
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# Axel Hecht <axel@pike.org>
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#
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# Alternatively, the contents of this file may be used under the terms of
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# either the GNU General Public License Version 2 or later (the "GPL"), or
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# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# in which case the provisions of the GPL or the LGPL are applicable instead
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# of those above. If you wish to allow use of your version of this file only
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# under the terms of either the GPL or the LGPL, and not to allow others to
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# use your version of this file under the terms of the MPL, indicate your
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# decision by deleting the provisions above and replace them with the notice
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# and other provisions required by the GPL or the LGPL. If you do not delete
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# the provisions above, a recipient may use your version of this file under
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# the terms of any one of the MPL, the GPL or the LGPL.
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#
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# ***** END LICENSE BLOCK *****
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import zipfile
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import time
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import binascii, struct
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import zlib
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from utils import lockFile
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class ZipFile(zipfile.ZipFile):
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""" Class with methods to open, read, write, close, list zip files.
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Subclassing zipfile.ZipFile to allow for overwriting of existing
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entries, though only for writestr, not for write.
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"""
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def __init__(self, file, mode="r", compression=zipfile.ZIP_STORED,
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lock = False):
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if lock:
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assert isinstance(file, basestring)
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self.lockfile = lockFile(file + '.lck')
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else:
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self.lockfile = None
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zipfile.ZipFile.__init__(self, file, mode, compression)
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self._remove = []
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self.end = self.fp.tell()
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self.debug = 0
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def writestr(self, zinfo_or_arcname, bytes):
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"""Write contents into the archive.
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The contents is the argument 'bytes', 'zinfo_or_arcname' is either
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a ZipInfo instance or the name of the file in the archive.
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This method is overloaded to allow overwriting existing entries.
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"""
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if not isinstance(zinfo_or_arcname, zipfile.ZipInfo):
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zinfo = zipfile.ZipInfo(filename=zinfo_or_arcname,
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date_time=time.localtime(time.time()))
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zinfo.compress_type = self.compression
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# Add some standard UNIX file access permissions (-rw-r--r--).
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zinfo.external_attr = (0x81a4 & 0xFFFF) << 16L
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else:
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zinfo = zinfo_or_arcname
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# Now to the point why we overwrote this in the first place,
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# remember the entry numbers if we already had this entry.
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# Optimizations:
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# If the entry to overwrite is the last one, just reuse that.
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# If we store uncompressed and the new content has the same size
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# as the old, reuse the existing entry.
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doSeek = False # store if we need to seek to the eof after overwriting
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if self.NameToInfo.has_key(zinfo.filename):
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# Find the last ZipInfo with our name.
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# Last, because that's catching multiple overwrites
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i = len(self.filelist)
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while i > 0:
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i -= 1
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if self.filelist[i].filename == zinfo.filename:
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break
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zi = self.filelist[i]
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if ((zinfo.compress_type == zipfile.ZIP_STORED
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and zi.compress_size == len(bytes))
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or (i + 1) == len(self.filelist)):
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# make sure we're allowed to write, otherwise done by writestr below
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self._writecheck(zi)
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# overwrite existing entry
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self.fp.seek(zi.header_offset)
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if (i + 1) == len(self.filelist):
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# this is the last item in the file, just truncate
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self.fp.truncate()
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else:
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# we need to move to the end of the file afterwards again
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doSeek = True
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# unhook the current zipinfo, the writestr of our superclass
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# will add a new one
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self.filelist.pop(i)
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self.NameToInfo.pop(zinfo.filename)
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else:
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# Couldn't optimize, sadly, just remember the old entry for removal
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self._remove.append(self.filelist.pop(i))
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zipfile.ZipFile.writestr(self, zinfo, bytes)
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self.filelist.sort(lambda l, r: cmp(l.header_offset, r.header_offset))
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if doSeek:
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self.fp.seek(self.end)
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self.end = self.fp.tell()
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def close(self):
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"""Close the file, and for mode "w" and "a" write the ending
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records.
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Overwritten to compact overwritten entries.
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"""
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if not self._remove:
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# we don't have anything special to do, let's just call base
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r = zipfile.ZipFile.close(self)
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self.lockfile = None
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return r
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if self.fp.mode != 'r+b':
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# adjust file mode if we originally just wrote, now we rewrite
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self.fp.close()
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self.fp = open(self.filename, 'r+b')
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all = map(lambda zi: (zi, True), self.filelist) + \
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map(lambda zi: (zi, False), self._remove)
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all.sort(lambda l, r: cmp(l[0].header_offset, r[0].header_offset))
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# empty _remove for multiple closes
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self._remove = []
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lengths = [all[i+1][0].header_offset - all[i][0].header_offset
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for i in xrange(len(all)-1)]
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lengths.append(self.end - all[-1][0].header_offset)
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to_pos = 0
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for (zi, keep), length in zip(all, lengths):
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if not keep:
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continue
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oldoff = zi.header_offset
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# python <= 2.4 has file_offset
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if hasattr(zi, 'file_offset'):
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zi.file_offset = zi.file_offset + to_pos - oldoff
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zi.header_offset = to_pos
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self.fp.seek(oldoff)
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content = self.fp.read(length)
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self.fp.seek(to_pos)
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self.fp.write(content)
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to_pos += length
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self.fp.truncate()
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zipfile.ZipFile.close(self)
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self.lockfile = None
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