diff options
Diffstat (limited to 'paramiko/ber.py')
| -rw-r--r-- | paramiko/ber.py | 44 |
1 files changed, 24 insertions, 20 deletions
diff --git a/paramiko/ber.py b/paramiko/ber.py index 3941581..0515230 100644 --- a/paramiko/ber.py +++ b/paramiko/ber.py @@ -15,9 +15,10 @@ # You should have received a copy of the GNU Lesser General Public License # along with Paramiko; if not, write to the Free Software Foundation, Inc., # 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. +from paramiko.common import max_byte, zero_byte +from paramiko.py3compat import b, byte_ord, byte_chr, long - -import util +import paramiko.util as util class BERException (Exception): @@ -29,13 +30,16 @@ class BER(object): Robey's tiny little attempt at a BER decoder. """ - def __init__(self, content=''): - self.content = content + def __init__(self, content=bytes()): + self.content = b(content) self.idx = 0 - def __str__(self): + def asbytes(self): return self.content + def __str__(self): + return self.asbytes() + def __repr__(self): return 'BER(\'' + repr(self.content) + '\')' @@ -45,13 +49,13 @@ class BER(object): def decode_next(self): if self.idx >= len(self.content): return None - ident = ord(self.content[self.idx]) + ident = byte_ord(self.content[self.idx]) self.idx += 1 if (ident & 31) == 31: # identifier > 30 ident = 0 while self.idx < len(self.content): - t = ord(self.content[self.idx]) + t = byte_ord(self.content[self.idx]) self.idx += 1 ident = (ident << 7) | (t & 0x7f) if not (t & 0x80): @@ -59,7 +63,7 @@ class BER(object): if self.idx >= len(self.content): return None # now fetch length - size = ord(self.content[self.idx]) + size = byte_ord(self.content[self.idx]) self.idx += 1 if size & 0x80: # more complimicated... @@ -67,12 +71,12 @@ class BER(object): t = size & 0x7f if self.idx + t > len(self.content): return None - size = util.inflate_long(self.content[self.idx : self.idx + t], True) + size = util.inflate_long(self.content[self.idx: self.idx + t], True) self.idx += t if self.idx + size > len(self.content): # can't fit return None - data = self.content[self.idx : self.idx + size] + data = self.content[self.idx: self.idx + size] self.idx += size # now switch on id if ident == 0x30: @@ -87,9 +91,9 @@ class BER(object): def decode_sequence(data): out = [] - b = BER(data) + ber = BER(data) while True: - x = b.decode_next() + x = ber.decode_next() if x is None: break out.append(x) @@ -98,20 +102,20 @@ class BER(object): def encode_tlv(self, ident, val): # no need to support ident > 31 here - self.content += chr(ident) + self.content += byte_chr(ident) if len(val) > 0x7f: lenstr = util.deflate_long(len(val)) - self.content += chr(0x80 + len(lenstr)) + lenstr + self.content += byte_chr(0x80 + len(lenstr)) + lenstr else: - self.content += chr(len(val)) + self.content += byte_chr(len(val)) self.content += val def encode(self, x): if type(x) is bool: if x: - self.encode_tlv(1, '\xff') + self.encode_tlv(1, max_byte) else: - self.encode_tlv(1, '\x00') + self.encode_tlv(1, zero_byte) elif (type(x) is int) or (type(x) is long): self.encode_tlv(2, util.deflate_long(x)) elif type(x) is str: @@ -122,8 +126,8 @@ class BER(object): raise BERException('Unknown type for encoding: %s' % repr(type(x))) def encode_sequence(data): - b = BER() + ber = BER() for item in data: - b.encode(item) - return str(b) + ber.encode(item) + return ber.asbytes() encode_sequence = staticmethod(encode_sequence) |