def _unpack(self, execute=EX_CONSTRUCT):
typ, n, obj = self._read_header(execute)
if execute == EX_READ_ARRAY_HEADER:
if typ != TYPE_ARRAY:
raise UnpackValueError("Expected array")
return n
if execute == EX_READ_MAP_HEADER:
if typ != TYPE_MAP:
raise UnpackValueError("Expected map")
return n
# TODO should we eliminate the recursion?
if typ == TYPE_ARRAY:
if execute == EX_SKIP:
for i in range(n):
# TODO check whether we need to call `list_hook`
self._unpack(EX_SKIP)
return
ret = newlist_hint(n)
for i in range(n):
ret.append(self._unpack(EX_CONSTRUCT))
if self._list_hook is not None:
ret = self._list_hook(ret)
# TODO is the interaction between `list_hook` and `use_list` ok?
return ret if self._use_list else tuple(ret)
if typ == TYPE_MAP:
if execute == EX_SKIP:
for i in range(n):
# TODO check whether we need to call hooks
self._unpack(EX_SKIP)
self._unpack(EX_SKIP)
return
if self._object_pairs_hook is not None:
ret = self._object_pairs_hook(
(self._unpack(EX_CONSTRUCT), self._unpack(EX_CONSTRUCT))
for _ in range(n))
else:
ret = {}
for _ in range(n):
key = self._unpack(EX_CONSTRUCT)
ret[key] = self._unpack(EX_CONSTRUCT)
if self._object_hook is not None:
ret = self._object_hook(ret)
return ret
if execute == EX_SKIP:
return
if typ == TYPE_RAW:
if self._encoding is not None:
obj = obj.decode(self._encoding, self._unicode_errors)
elif self._raw:
obj = bytes(obj)
else:
obj = obj.decode('utf_8')
return obj
if typ == TYPE_EXT:
return self._ext_hook(n, bytes(obj))
if typ == TYPE_BIN:
return bytes(obj)
assert typ == TYPE_IMMEDIATE
return obj
def unpackb(packed, **kwargs):
"""
Unpack an object from `packed`.
Raises `ExtraData` when `packed` contains extra bytes.
See :class:`Unpacker` for options.
"""
unpacker = Unpacker(None, **kwargs)
unpacker.feed(packed)
try:
ret = unpacker._unpack()
except OutOfData:
raise UnpackValueError("Data is not enough.")
if unpacker._got_extradata():
raise ExtraData(ret, unpacker._get_extradata())
return ret
def _read_header(self, execute=EX_CONSTRUCT):
typ = TYPE_IMMEDIATE
n = 0
obj = None
self._reserve(1)
b = self._buffer[self._buff_i]
self._buff_i += 1
if b & 0b10000000 == 0:
obj = b
elif b & 0b11100000 == 0b11100000:
obj = -1 - (b ^ 0xff)
elif b & 0b11100000 == 0b10100000:
n = b & 0b00011111
typ = TYPE_RAW
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b & 0b11110000 == 0b10010000:
n = b & 0b00001111
typ = TYPE_ARRAY
if n > self._max_array_len:
raise UnpackValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b & 0b11110000 == 0b10000000:
n = b & 0b00001111
typ = TYPE_MAP
if n > self._max_map_len:
raise UnpackValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
elif b == 0xc0:
obj = None
elif b == 0xc2:
obj = False
elif b == 0xc3:
obj = True
elif b == 0xc4:
typ = TYPE_BIN
self._reserve(1)
n = self._buffer[self._buff_i]
self._buff_i += 1
if n > self._max_bin_len:
raise UnpackValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._read(n)
elif b == 0xc5:
typ = TYPE_BIN
self._reserve(2)
n = struct.unpack_from(">H", self._buffer_view, self._buff_i)[0]
self._buff_i += 2
if n > self._max_bin_len:
raise UnpackValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._read(n)
elif b == 0xc6:
typ = TYPE_BIN
self._reserve(4)
n = struct.unpack_from(">I", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
if n > self._max_bin_len:
raise UnpackValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._read(n)
elif b == 0xc7: # ext 8
typ = TYPE_EXT
self._reserve(2)
L, n = struct.unpack_from('Bb', self._buffer_view, self._buff_i)
self._buff_i += 2
if L > self._max_ext_len:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._read(L)
elif b == 0xc8: # ext 16
typ = TYPE_EXT
self._reserve(3)
L, n = struct.unpack_from('>Hb', self._buffer_view, self._buff_i)
self._buff_i += 3
if L > self._max_ext_len:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._read(L)
elif b == 0xc9: # ext 32
typ = TYPE_EXT
self._reserve(5)
L, n = struct.unpack_from('>Ib', self._buffer_view, self._buff_i)
self._buff_i += 5
if L > self._max_ext_len:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._read(L)
elif b == 0xca:
self._reserve(4)
obj = struct.unpack_from(">f", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
elif b == 0xcb:
self._reserve(8)
obj = struct.unpack_from(">d", self._buffer_view, self._buff_i)[0]
self._buff_i += 8
elif b == 0xcc:
self._reserve(1)
obj = self._buffer[self._buff_i]
self._buff_i += 1
elif b == 0xcd:
self._reserve(2)
obj = struct.unpack_from(">H", self._buffer_view, self._buff_i)[0]
self._buff_i += 2
elif b == 0xce:
self._reserve(4)
obj = struct.unpack_from(">I", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
elif b == 0xcf:
self._reserve(8)
obj = struct.unpack_from(">Q", self._buffer_view, self._buff_i)[0]
self._buff_i += 8
elif b == 0xd0:
self._reserve(1)
obj = struct.unpack_from("b", self._buffer_view, self._buff_i)[0]
self._buff_i += 1
elif b == 0xd1:
self._reserve(2)
obj = struct.unpack_from(">h", self._buffer_view, self._buff_i)[0]
self._buff_i += 2
elif b == 0xd2:
self._reserve(4)
obj = struct.unpack_from(">i", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
elif b == 0xd3:
self._reserve(8)
obj = struct.unpack_from(">q", self._buffer_view, self._buff_i)[0]
self._buff_i += 8
elif b == 0xd4: # fixext 1
typ = TYPE_EXT
if self._max_ext_len < 1:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(1, self._max_ext_len))
self._reserve(2)
n, obj = struct.unpack_from("b1s", self._buffer_view, self._buff_i)
self._buff_i += 2
elif b == 0xd5: # fixext 2
typ = TYPE_EXT
if self._max_ext_len < 2:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(2, self._max_ext_len))
self._reserve(3)
n, obj = struct.unpack_from("b2s", self._buffer_view, self._buff_i)
self._buff_i += 3
elif b == 0xd6: # fixext 4
typ = TYPE_EXT
if self._max_ext_len < 4:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(4, self._max_ext_len))
self._reserve(5)
n, obj = struct.unpack_from("b4s", self._buffer_view, self._buff_i)
self._buff_i += 5
elif b == 0xd7: # fixext 8
typ = TYPE_EXT
if self._max_ext_len < 8:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(8, self._max_ext_len))
self._reserve(9)
n, obj = struct.unpack_from("b8s", self._buffer_view, self._buff_i)
self._buff_i += 9
elif b == 0xd8: # fixext 16
typ = TYPE_EXT
if self._max_ext_len < 16:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(16, self._max_ext_len))
self._reserve(17)
n, obj = struct.unpack_from("b16s", self._buffer_view,
self._buff_i)
self._buff_i += 17
elif b == 0xd9:
typ = TYPE_RAW
self._reserve(1)
n = self._buffer[self._buff_i]
self._buff_i += 1
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b == 0xda:
typ = TYPE_RAW
self._reserve(2)
n, = struct.unpack_from(">H", self._buffer_view, self._buff_i)
self._buff_i += 2
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b == 0xdb:
typ = TYPE_RAW
self._reserve(4)
n, = struct.unpack_from(">I", self._buffer_view, self._buff_i)
self._buff_i += 4
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b == 0xdc:
typ = TYPE_ARRAY
self._reserve(2)
n, = struct.unpack_from(">H", self._buffer_view, self._buff_i)
self._buff_i += 2
if n > self._max_array_len:
raise UnpackValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b == 0xdd:
typ = TYPE_ARRAY
self._reserve(4)
n, = struct.unpack_from(">I", self._buffer_view, self._buff_i)
self._buff_i += 4
if n > self._max_array_len:
raise UnpackValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b == 0xde:
self._reserve(2)
n, = struct.unpack_from(">H", self._buffer_view, self._buff_i)
self._buff_i += 2
if n > self._max_map_len:
raise UnpackValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
typ = TYPE_MAP
elif b == 0xdf:
self._reserve(4)
n, = struct.unpack_from(">I", self._buffer_view, self._buff_i)
self._buff_i += 4
if n > self._max_map_len:
raise UnpackValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
typ = TYPE_MAP
else:
raise UnpackValueError("Unknown header: 0x%x" % b)
return typ, n, obj
def _read_header(self, execute=EX_CONSTRUCT):
typ = TYPE_IMMEDIATE
n = 0
obj = None
self._reserve(1)
b = self._buffer[self._buff_i]
self._buff_i += 1
if b & 0b10000000 == 0:
obj = b
elif b & 0b11100000 == 0b11100000:
obj = -1 - (b ^ 0xFF)
elif b & 0b11100000 == 0b10100000:
n = b & 0b00011111
typ = TYPE_RAW
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b & 0b11110000 == 0b10010000:
n = b & 0b00001111
typ = TYPE_ARRAY
if n > self._max_array_len:
raise UnpackValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b & 0b11110000 == 0b10000000:
n = b & 0b00001111
typ = TYPE_MAP
if n > self._max_map_len:
raise UnpackValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
elif b == 0xC0:
obj = None
elif b == 0xC2:
obj = False
elif b == 0xC3:
obj = True
elif b == 0xC4:
typ = TYPE_BIN
self._reserve(1)
n = self._buffer[self._buff_i]
self._buff_i += 1
if n > self._max_bin_len:
raise UnpackValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._read(n)
elif b == 0xC5:
typ = TYPE_BIN
self._reserve(2)
n = struct.unpack_from(">H", self._buffer_view, self._buff_i)[0]
self._buff_i += 2
if n > self._max_bin_len:
raise UnpackValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._read(n)
elif b == 0xC6:
typ = TYPE_BIN
self._reserve(4)
n = struct.unpack_from(">I", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
if n > self._max_bin_len:
raise UnpackValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._read(n)
elif b == 0xC7: # ext 8
typ = TYPE_EXT
self._reserve(2)
L, n = struct.unpack_from("Bb", self._buffer_view, self._buff_i)
self._buff_i += 2
if L > self._max_ext_len:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._read(L)
elif b == 0xC8: # ext 16
typ = TYPE_EXT
self._reserve(3)
L, n = struct.unpack_from(">Hb", self._buffer_view, self._buff_i)
self._buff_i += 3
if L > self._max_ext_len:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._read(L)
elif b == 0xC9: # ext 32
typ = TYPE_EXT
self._reserve(5)
L, n = struct.unpack_from(">Ib", self._buffer_view, self._buff_i)
self._buff_i += 5
if L > self._max_ext_len:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._read(L)
elif b == 0xCA:
self._reserve(4)
obj = struct.unpack_from(">f", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
elif b == 0xCB:
self._reserve(8)
obj = struct.unpack_from(">d", self._buffer_view, self._buff_i)[0]
self._buff_i += 8
elif b == 0xCC:
self._reserve(1)
obj = self._buffer[self._buff_i]
self._buff_i += 1
elif b == 0xCD:
self._reserve(2)
obj = struct.unpack_from(">H", self._buffer_view, self._buff_i)[0]
self._buff_i += 2
elif b == 0xCE:
self._reserve(4)
obj = struct.unpack_from(">I", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
elif b == 0xCF:
self._reserve(8)
obj = struct.unpack_from(">Q", self._buffer_view, self._buff_i)[0]
self._buff_i += 8
elif b == 0xD0:
self._reserve(1)
obj = struct.unpack_from("b", self._buffer_view, self._buff_i)[0]
self._buff_i += 1
elif b == 0xD1:
self._reserve(2)
obj = struct.unpack_from(">h", self._buffer_view, self._buff_i)[0]
self._buff_i += 2
elif b == 0xD2:
self._reserve(4)
obj = struct.unpack_from(">i", self._buffer_view, self._buff_i)[0]
self._buff_i += 4
elif b == 0xD3:
self._reserve(8)
obj = struct.unpack_from(">q", self._buffer_view, self._buff_i)[0]
self._buff_i += 8
elif b == 0xD4: # fixext 1
typ = TYPE_EXT
if self._max_ext_len < 1:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(1, self._max_ext_len))
self._reserve(2)
n, obj = struct.unpack_from("b1s", self._buffer_view, self._buff_i)
self._buff_i += 2
elif b == 0xD5: # fixext 2
typ = TYPE_EXT
if self._max_ext_len < 2:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(2, self._max_ext_len))
self._reserve(3)
n, obj = struct.unpack_from("b2s", self._buffer_view, self._buff_i)
self._buff_i += 3
elif b == 0xD6: # fixext 4
typ = TYPE_EXT
if self._max_ext_len < 4:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(4, self._max_ext_len))
self._reserve(5)
n, obj = struct.unpack_from("b4s", self._buffer_view, self._buff_i)
self._buff_i += 5
elif b == 0xD7: # fixext 8
typ = TYPE_EXT
if self._max_ext_len < 8:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(8, self._max_ext_len))
self._reserve(9)
n, obj = struct.unpack_from("b8s", self._buffer_view, self._buff_i)
self._buff_i += 9
elif b == 0xD8: # fixext 16
typ = TYPE_EXT
if self._max_ext_len < 16:
raise UnpackValueError("%s exceeds max_ext_len(%s)" %
(16, self._max_ext_len))
self._reserve(17)
n, obj = struct.unpack_from("b16s", self._buffer_view,
self._buff_i)
self._buff_i += 17
elif b == 0xD9:
typ = TYPE_RAW
self._reserve(1)
n = self._buffer[self._buff_i]
self._buff_i += 1
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b == 0xDA:
typ = TYPE_RAW
self._reserve(2)
n, = struct.unpack_from(">H", self._buffer_view, self._buff_i)
self._buff_i += 2
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b == 0xDB:
typ = TYPE_RAW
self._reserve(4)
n, = struct.unpack_from(">I", self._buffer_view, self._buff_i)
self._buff_i += 4
if n > self._max_str_len:
raise UnpackValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._read(n)
elif b == 0xDC:
typ = TYPE_ARRAY
self._reserve(2)
n, = struct.unpack_from(">H", self._buffer_view, self._buff_i)
self._buff_i += 2
if n > self._max_array_len:
raise UnpackValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b == 0xDD:
typ = TYPE_ARRAY
self._reserve(4)
n, = struct.unpack_from(">I", self._buffer_view, self._buff_i)
self._buff_i += 4
if n > self._max_array_len:
raise UnpackValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b == 0xDE:
self._reserve(2)
n, = struct.unpack_from(">H", self._buffer_view, self._buff_i)
self._buff_i += 2
if n > self._max_map_len:
raise UnpackValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
typ = TYPE_MAP
elif b == 0xDF:
self._reserve(4)
n, = struct.unpack_from(">I", self._buffer_view, self._buff_i)
self._buff_i += 4
if n > self._max_map_len:
raise UnpackValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
typ = TYPE_MAP
else:
raise UnpackValueError("Unknown header: 0x%x" % b)
return typ, n, obj
def _read_header(self, execute=EX_CONSTRUCT, write_bytes=None):
typ = TYPE_IMMEDIATE
n = 0
obj = None
c = self._fb_read(1, write_bytes)
b = ord(c)
if b & 0b10000000 == 0:
obj = b
elif b & 0b11100000 == 0b11100000:
obj = struct.unpack("b", c)[0]
elif b & 0b11100000 == 0b10100000:
n = b & 0b00011111
obj = self._fb_read(n, write_bytes)
typ = TYPE_RAW
if n > self._max_str_len:
raise ValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
elif b & 0b11110000 == 0b10010000:
n = b & 0b00001111
typ = TYPE_ARRAY
if n > self._max_array_len:
raise ValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
elif b & 0b11110000 == 0b10000000:
n = b & 0b00001111
typ = TYPE_MAP
if n > self._max_map_len:
raise ValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
elif b == 0xc0:
obj = None
elif b == 0xc2:
obj = False
elif b == 0xc3:
obj = True
elif b == 0xc4:
typ = TYPE_BIN
n = struct.unpack("B", self._fb_read(1, write_bytes))[0]
if n > self._max_bin_len:
raise ValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._fb_read(n, write_bytes)
elif b == 0xc5:
typ = TYPE_BIN
n = struct.unpack(">H", self._fb_read(2, write_bytes))[0]
if n > self._max_bin_len:
raise ValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._fb_read(n, write_bytes)
elif b == 0xc6:
typ = TYPE_BIN
n = struct.unpack(">I", self._fb_read(4, write_bytes))[0]
if n > self._max_bin_len:
raise ValueError("%s exceeds max_bin_len(%s)" %
(n, self._max_bin_len))
obj = self._fb_read(n, write_bytes)
elif b == 0xc7: # ext 8
typ = TYPE_EXT
L, n = struct.unpack('Bb', self._fb_read(2, write_bytes))
if L > self._max_ext_len:
raise ValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._fb_read(L, write_bytes)
elif b == 0xc8: # ext 16
typ = TYPE_EXT
L, n = struct.unpack('>Hb', self._fb_read(3, write_bytes))
if L > self._max_ext_len:
raise ValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._fb_read(L, write_bytes)
elif b == 0xc9: # ext 32
typ = TYPE_EXT
L, n = struct.unpack('>Ib', self._fb_read(5, write_bytes))
if L > self._max_ext_len:
raise ValueError("%s exceeds max_ext_len(%s)" %
(L, self._max_ext_len))
obj = self._fb_read(L, write_bytes)
elif b == 0xca:
obj = struct.unpack(">f", self._fb_read(4, write_bytes))[0]
elif b == 0xcb:
obj = struct.unpack(">d", self._fb_read(8, write_bytes))[0]
elif b == 0xcc:
obj = struct.unpack("B", self._fb_read(1, write_bytes))[0]
elif b == 0xcd:
obj = struct.unpack(">H", self._fb_read(2, write_bytes))[0]
elif b == 0xce:
obj = struct.unpack(">I", self._fb_read(4, write_bytes))[0]
elif b == 0xcf:
obj = struct.unpack(">Q", self._fb_read(8, write_bytes))[0]
elif b == 0xd0:
obj = struct.unpack("b", self._fb_read(1, write_bytes))[0]
elif b == 0xd1:
obj = struct.unpack(">h", self._fb_read(2, write_bytes))[0]
elif b == 0xd2:
obj = struct.unpack(">i", self._fb_read(4, write_bytes))[0]
elif b == 0xd3:
obj = struct.unpack(">q", self._fb_read(8, write_bytes))[0]
elif b == 0xd4: # fixext 1
typ = TYPE_EXT
if self._max_ext_len < 1:
raise ValueError("%s exceeds max_ext_len(%s)" %
(1, self._max_ext_len))
n, obj = struct.unpack('b1s', self._fb_read(2, write_bytes))
elif b == 0xd5: # fixext 2
typ = TYPE_EXT
if self._max_ext_len < 2:
raise ValueError("%s exceeds max_ext_len(%s)" %
(2, self._max_ext_len))
n, obj = struct.unpack('b2s', self._fb_read(3, write_bytes))
elif b == 0xd6: # fixext 4
typ = TYPE_EXT
if self._max_ext_len < 4:
raise ValueError("%s exceeds max_ext_len(%s)" %
(4, self._max_ext_len))
n, obj = struct.unpack('b4s', self._fb_read(5, write_bytes))
elif b == 0xd7: # fixext 8
typ = TYPE_EXT
if self._max_ext_len < 8:
raise ValueError("%s exceeds max_ext_len(%s)" %
(8, self._max_ext_len))
n, obj = struct.unpack('b8s', self._fb_read(9, write_bytes))
elif b == 0xd8: # fixext 16
typ = TYPE_EXT
if self._max_ext_len < 16:
raise ValueError("%s exceeds max_ext_len(%s)" %
(16, self._max_ext_len))
n, obj = struct.unpack('b16s', self._fb_read(17, write_bytes))
elif b == 0xd9:
typ = TYPE_RAW
n = struct.unpack("B", self._fb_read(1, write_bytes))[0]
if n > self._max_str_len:
raise ValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._fb_read(n, write_bytes)
elif b == 0xda:
typ = TYPE_RAW
n = struct.unpack(">H", self._fb_read(2, write_bytes))[0]
if n > self._max_str_len:
raise ValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._fb_read(n, write_bytes)
elif b == 0xdb:
typ = TYPE_RAW
n = struct.unpack(">I", self._fb_read(4, write_bytes))[0]
if n > self._max_str_len:
raise ValueError("%s exceeds max_str_len(%s)", n,
self._max_str_len)
obj = self._fb_read(n, write_bytes)
elif b == 0xdc:
n = struct.unpack(">H", self._fb_read(2, write_bytes))[0]
if n > self._max_array_len:
raise ValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
typ = TYPE_ARRAY
elif b == 0xdd:
n = struct.unpack(">I", self._fb_read(4, write_bytes))[0]
if n > self._max_array_len:
raise ValueError("%s exceeds max_array_len(%s)", n,
self._max_array_len)
typ = TYPE_ARRAY
elif b == 0xde:
n = struct.unpack(">H", self._fb_read(2, write_bytes))[0]
if n > self._max_map_len:
raise ValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
typ = TYPE_MAP
elif b == 0xdf:
n = struct.unpack(">I", self._fb_read(4, write_bytes))[0]
if n > self._max_map_len:
raise ValueError("%s exceeds max_map_len(%s)", n,
self._max_map_len)
typ = TYPE_MAP
else:
raise UnpackValueError("Unknown header: 0x%x" % b)
return typ, n, obj
