def _create_header(info, format_, encoding, errors):
"""Return a header block. info is a dictionary with file
information, format must be one of the *_FORMAT constants.
"""
parts = [
tarfile.stn(info.get("name", ""), 100, encoding, errors),
tarfile.itn(info.get("mode", 0), 8, format_),
tarfile.itn(info.get("uid", 0), 8, format_),
tarfile.itn(info.get("gid", 0), 8, format_),
tarfile.itn(info.get("size", 0), 12, format_),
tarfile.itn(info.get("mtime", 0), 12, format_),
b" " * 8, # checksum field
info.get("type", tarfile.REGTYPE),
tarfile.stn(info.get("linkname", ""), 100, encoding, errors),
info.get("magic", tarfile.POSIX_MAGIC),
tarfile.stn(info.get("uname", ""), 32, encoding, errors),
tarfile.stn(info.get("gname", ""), 32, encoding, errors),
tarfile.itn(info.get("devmajor", 0), 8, format_),
tarfile.itn(info.get("devminor", 0), 8, format_),
tarfile.stn(info.get("prefix", ""), 155, encoding, errors)
]
buf = struct.pack("%ds" % tarfile.BLOCKSIZE, b"".join(parts))
chksum = tarfile.calc_chksums(buf[-tarfile.BLOCKSIZE:])[0]
buf = buf[:-364] + bytes("%06o\0" % chksum, "ascii") + buf[-357:]
return buf
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 create_ext_sparse_headers(self):
for ext_hdr in range(4, len(self.sparsemap), 21):
sparse_parts = [
self.sparse_header_chunk(i).decode(tarfile.ENCODING,
'surrogateescape')
for i in range(ext_hdr, ext_hdr + 21)
]
sparse_parts.append('\1' if ext_hdr +
21 < len(self.sparsemap) else '\0')
yield tarfile.stn(''.join(sparse_parts), 512, tarfile.ENCODING,
'surrogateescape')
def get_gnu_header(self):
'''Part placed in 'prefix' field of posix header'''
parts = [
tarfile.itn(self.mtime, 12, tarfile.GNU_FORMAT), # atime
tarfile.itn(self.mtime, 12, tarfile.GNU_FORMAT), # ctime
tarfile.itn(0, 12, tarfile.GNU_FORMAT), # offset
tarfile.stn('', 4, tarfile.ENCODING,
'surrogateescape'), #longnames
b'\0', # unused_pad2
]
parts += [self.sparse_header_chunk(i) for i in range(4)]
parts += [
b'\1' if len(self.sparsemap) > 4 else b'\0', # isextended
tarfile.itn(self.realsize, 12, tarfile.GNU_FORMAT), # realsize
]
return b''.join(parts)
print ("\n==========================\n")
import zlib, base64
text = b'STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW '
code = base64.b64encode(zlib.compress(text,9))
print (code)
import zlib, base64
s='eNoLDnF09lbwD3MNcvPxD1cIHhxcAE9UKaU='
data = zlib.decompress(base64.b64decode(s))
print (data)
print ("\n==========================\n")
import tarfile
text = b'STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW STACK OVERFLOW '
code = tarfile.stn(text)
print (code)
def update_event(self, inp=-1):
self.set_output_val(0, tarfile.stn(self.input(0), self.input(1), self.input(2), self.input(3)))
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")