def iter_tar(f):
while True:
header = f.read(512)
if not header:
break
typ = header[156:157]
name = tarfile.nts(header[0:100], ENCODING, 'surrogateescape')
prefix = tarfile.nts(header[345:500], ENCODING, 'surrogateescape')
if prefix and typ not in tarfile.GNU_TYPES:
name = f'{prefix}/{name}'
if not name:
continue
size = tarfile.nti(header[124:136])
if size:
contents = tarfile.nts(f.read(size), ENCODING, 'surrogateescape')
else:
contents = None
if name != '././@PaxHeader':
yield name, contents
mod = f.tell() % 512
if mod:
f.seek(512 - mod, 1)
def test_char_fields(self):
self.assertEqual(tarfile.stn("foo", 8, "ascii", "strict"),
b"foo\0\0\0\0\0")
self.assertEqual(tarfile.stn("foobar", 3, "ascii", "strict"), b"foo")
self.assertEqual(tarfile.nts(b"foo\0\0\0\0\0", "ascii", "strict"),
"foo")
self.assertEqual(tarfile.nts(b"foo\0bar\0", "ascii", "strict"), "foo")
def frombuf(cls, buf):
"""Construct a TarInfo object from a 512 byte string buffer.
"""
tarinfo = cls()
tarinfo.name = nts(buf[0:100])
tarinfo.mode = int(buf[100:108], 8)
tarinfo.uid = int(buf[108:116],8)
tarinfo.gid = int(buf[116:124],8)
# There are two possible codings for the size field we
# have to discriminate, see comment in tobuf() below.
if buf[124] != chr(0200):
tarinfo.size = long(buf[124:136], 8)
else:
tarinfo.size = 0L
for i in range(11):
tarinfo.size <<= 8
tarinfo.size += ord(buf[125 + i])
tarinfo.mtime = long(buf[136:148], 8)
tarinfo.chksum = int(buf[148:156], 8)
tarinfo.type = buf[156:157]
tarinfo.linkname = nts(buf[157:257])
tarinfo.uname = nts(buf[265:297])
tarinfo.gname = nts(buf[297:329])
try:
tarinfo.devmajor = int(buf[329:337], 8)
tarinfo.devminor = int(buf[337:345], 8)
except ValueError:
tarinfo.devmajor = tarinfo.devmajor = 0
tarinfo.prefix = buf[345:500]
# The prefix field is used for filenames > 100 in
# the POSIX standard.
# name = prefix + '/' + name
if tarinfo.type != GNUTYPE_SPARSE:
tarinfo.name = normpath(os.path.join(nts(tarinfo.prefix), tarinfo.name))
# Some old tar programs represent a directory as a regular
# file with a trailing slash.
if tarinfo.isreg() and tarinfo.name.endswith("/"):
tarinfo.type = DIRTYPE
# Directory names should have a '/' at the end.
if tarinfo.isdir():
tarinfo.name += "/"
return tarinfo
def frombuf(cls, buf):
"""Construct a TarInfo object from a 512 byte string buffer.
"""
tarinfo = cls()
tarinfo.name = nts(buf[0:100])
tarinfo.mode = int(buf[100:108], 8)
tarinfo.uid = int(buf[108:116], 8)
tarinfo.gid = int(buf[116:124], 8)
# There are two possible codings for the size field we
# have to discriminate, see comment in tobuf() below.
if buf[124] != chr(0200):
tarinfo.size = long(buf[124:136], 8)
def update_event(self, inp=-1):
self.set_output_val(0, tarfile.nts(self.input(0), self.input(1), self.input(2)))
def test_char_fields(self):
self.assertEqual(tarfile.stn("foo", 8, "ascii", "strict"), b"foo\0\0\0\0\0")
self.assertEqual(tarfile.stn("foobar", 3, "ascii", "strict"), b"foo")
self.assertEqual(tarfile.nts(b"foo\0\0\0\0\0", "ascii", "strict"), "foo")
self.assertEqual(tarfile.nts(b"foo\0bar\0", "ascii", "strict"), "foo")
tarinfo.gid = int(buf[116:124], 8)
# There are two possible codings for the size field we
# have to discriminate, see comment in tobuf() below.
if buf[124] != chr(0200):
tarinfo.size = long(buf[124:136], 8)
else:
tarinfo.size = 0L
for i in range(11):
tarinfo.size <<= 8
tarinfo.size += ord(buf[125 + i])
tarinfo.mtime = long(buf[136:148], 8)
tarinfo.chksum = int(buf[148:156], 8)
tarinfo.type = buf[156:157]
tarinfo.linkname = nts(buf[157:257])
tarinfo.uname = nts(buf[265:297])
tarinfo.gname = nts(buf[297:329])
try:
tarinfo.devmajor = int(buf[329:337], 8)
tarinfo.devminor = int(buf[337:345], 8)
except ValueError:
tarinfo.devmajor = tarinfo.devmajor = 0
tarinfo.prefix = buf[345:500]
# The prefix field is used for filenames > 100 in
# the POSIX standard.
# name = prefix + '/' + name
if tarinfo.type != GNUTYPE_SPARSE:
tarinfo.name = normpath(
os.path.join(nts(tarinfo.prefix), tarinfo.name))