gramps/gramps2/src/TarFile.py

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Python
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2002-10-20 19:55:16 +05:30
#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2000 Donald N. Allingham
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import gzip
import cStringIO
import string
import os
_BLKSIZE=512
nul = '\0'
class TarFile:
def __init__(self,name):
self.name = name
self.f = gzip.open(name,"wb")
self.pos = 0
def add_file(self,filename,mtime,iobuf):
iobuf.seek(0,2)
length = iobuf.tell()
iobuf.seek(0)
buf = filename
buf = buf + '\0'*(100-len(filename))
buf = buf + "0100664" + nul
buf = buf + "0000764" + nul
buf = buf + "0000764" + nul
buf = buf + "%011o" % length + nul
buf = buf + "%011o" % mtime + nul
buf = buf + "%s"
buf = buf + "0" + '\0'*100 + 'ustar \0'
buf = buf + '\0'*32
buf = buf + '\0'*32
buf = buf + '\0'*183
chksum = 0
blank = " "
temp = buf % (blank)
for c in temp:
chksum = chksum + ord(c)
sum = "%06o " % chksum
sum = sum + nul
buf = buf % sum
self.pos = self.pos + len(buf)
self.f.write(buf)
buf = iobuf.read(length)
self.f.write(buf)
self.pos = self.pos + length
rem = _BLKSIZE - (self.pos % _BLKSIZE)
if rem != 0:
self.f.write('\0' * rem)
self.pos = self.pos + rem
def close(self):
rem = (_BLKSIZE*20) - (self.pos % (_BLKSIZE*20))
if rem != 0:
self.f.write('\0' * rem)
self.f.close()
class ReadTarFile:
def __init__(self,name,wd):
self.name = name
self.wd = wd
self.f = gzip.open(name,"rb")
self.pos = 0
def extract_files(self):
map = {}
while 1:
buf = self.f.read(100)
if buf == '':
return
index = 0
for b in buf:
if b != '\0':
index = index + 1
else:
if index == 0:
return map
continue
filename = buf[0:index]
if filename == None:
return map
self.f.read(24) # modes
l = string.replace(self.f.read(12),chr(0),' ')
length = string.atoi(l,8)
self.f.read(12)
self.f.read(6)
self.f.read(111)
self.f.read(64)
self.f.read(183)
foo = cStringIO.StringIO()
map[filename] = foo
foo.write(self.f.read(length))
foo.reset()
self.f.read(_BLKSIZE-(length%_BLKSIZE))
def extract(self):
while 1:
buf = self.f.read(100)
if buf == '':
return
index = 0
for b in buf:
if b != '\0':
index = index + 1
else:
if index == 0:
return
continue
filename = buf[0:index]
self.f.read(24) # modes
l = self.f.read(12)
# length = int(l,8)
length_string = "";
for char in l:
if ord(char) != 0:
length_string = length_string + char
length = string.atoi(length_string,8)
self.f.read(12)
self.f.read(6)
self.f.read(111)
self.f.read(64)
self.f.read(183)
foo = open(self.wd + os.sep + filename,"wb")
foo.write(self.f.read(length))
foo.close()
self.f.read(_BLKSIZE-(length%_BLKSIZE))
def close(self):
self.f.close()
if __name__ == "__main__":
a = ReadTarFile("out.gpkg",".")
a.extract()
a.close()