def extract(self, offset, out=None):
'''Extracts the tar item starting at offset to out'''
if not 'r' == self.mode:
raise ValueError, 'Cannot extract in append mode'
assert offset % BLOCKSIZE == 0, 'Bad offset (%d)' % offset
if out is None:
return _pylibtar.pytar_extract_tobuf(self.tar, offset)
else:
if isinstance(out, basestring):
fdout = open(out, 'w+b').fileno()
elif hasattr(out, 'fileno'):
fdout = out.fileno()
else:
fdout = out
_pylibtar.pytar_extract(self.tar, offset, fdout)
if hasattr(out, 'flush'):
out.flush()
return out
def extract_iter(self, offset):
'''Extracts the tar item starting at offset and returns an iterable'''
if not 'r' == self.mode:
raise ValueError, 'Cannot extract in append mode'
assert offset % BLOCKSIZE == 0, 'Bad offset (%d)' % offset
info = _pylibtar.pytar_info(self.tar, offset)
if info['size'] <= self.CHUNKSIZE:
yield _pylibtar.pytar_extract_tobuf(self.tar, offset)
else:
import tempfile
tempfd, tempfn = tempfile.mkstemp()
_pylibtar.pytar_extract(self.tar, offset, tempfd)
os.close(tempfd)
fh = open(tempfn, 'rb')
os.unlink(tempfn)
while 1:
chunk = fh.read(self.CHUNKSIZE)
if not chunk: break
yield chunk
import _pylibtar
TESTTAR = '/tmp/_pylibtar-test.tar'
print 'opening %s for append' % TESTTAR
tar = _pylibtar.pytar_open(TESTTAR, 'a')
print 'tar:', tar
print 'append:', _pylibtar.pytar_append_file(tar, __file__,
os.path.basename(__file__))
print 'close:', _pylibtar.pytar_close(tar)
print 'ITER'
tar = _pylibtar.pytar_open(TESTTAR, 'r')
print 'tar:', tar, 'ITER_RESET'
print _pylibtar.pytar_iter_reset(tar)
info = None
while 1:
try:
print 'ITER_NEXT', os.lseek(_pylibtar.tar_fd(tar), 0, 1)
info = _pylibtar.pytar_iter_next(tar)
except StopIteration:
break
print 'INFO: %r' % info
if not info: break
if info:
import sys
print 'EXTRACTING %s' % info
_pylibtar.pytar_extract(tar, info['offset'], sys.stdout.fileno())
print 'close:', _pylibtar.pytar_close(tar)
