def decode_value(encoded, offset):
"""Decode the value passed in returning the decoded value and the number
of bytes read in addition to the starting offset.
:param str encoded: The binary encoded data to decode
:param int offset: The starting byte offset
:rtype: tuple
:raises: pika.exceptions.InvalidFieldTypeException
"""
# slice to get bytes in Python 3 and str in Python 2
kind = encoded[offset:offset + 1]
offset += 1
# Bool
if kind == b't':
value = struct.unpack_from('>B', encoded, offset)[0]
value = bool(value)
offset += 1
# Short-Short Int
elif kind == b'b':
value = struct.unpack_from('>B', encoded, offset)[0]
offset += 1
# Short-Short Unsigned Int
elif kind == b'B':
value = struct.unpack_from('>b', encoded, offset)[0]
offset += 1
# Short Int
elif kind == b'U':
value = struct.unpack_from('>h', encoded, offset)[0]
offset += 2
# Short Unsigned Int
elif kind == b'u':
value = struct.unpack_from('>H', encoded, offset)[0]
offset += 2
# Long Int
elif kind == b'I':
value = struct.unpack_from('>i', encoded, offset)[0]
offset += 4
# Long Unsigned Int
elif kind == b'i':
value = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
# Long-Long Int
elif kind == b'L':
value = long(struct.unpack_from('>q', encoded, offset)[0])
offset += 8
# Long-Long Unsigned Int
elif kind == b'l':
value = long(struct.unpack_from('>Q', encoded, offset)[0])
offset += 8
# Float
elif kind == b'f':
value = long(struct.unpack_from('>f', encoded, offset)[0])
offset += 4
# Double
elif kind == b'd':
value = long(struct.unpack_from('>d', encoded, offset)[0])
offset += 8
# Decimal
elif kind == b'D':
decimals = struct.unpack_from('B', encoded, offset)[0]
offset += 1
raw = struct.unpack_from('>i', encoded, offset)[0]
offset += 4
value = decimal.Decimal(raw) * (decimal.Decimal(10)**-decimals)
# Short String
elif kind == b's':
value, offset = decode_short_string(encoded, offset)
# Long String
elif kind == b'S':
length = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
value = encoded[offset:offset + length].decode('utf8')
offset += length
# Field Array
elif kind == b'A':
length = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
offset_end = offset + length
value = []
while offset < offset_end:
v, offset = decode_value(encoded, offset)
value.append(v)
# Timestamp
elif kind == b'T':
value = datetime.utcfromtimestamp(
struct.unpack_from('>Q', encoded, offset)[0])
offset += 8
# Field Table
elif kind == b'F':
(value, offset) = decode_table(encoded, offset)
# Null / Void
elif kind == b'V':
value = None
else:
raise exceptions.InvalidFieldTypeException(kind)
return value, offset
def decode_value(encoded, offset):
"""Decode the value passed in returning the decoded value and the number
of bytes read in addition to the starting offset.
:param str encoded: The binary encoded data to decode
:param int offset: The starting byte offset
:rtype: tuple
:raises: pika.exceptions.InvalidFieldTypeException
"""
kind = encoded[offset]
offset += 1
if kind == 'S':
length = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
value = encoded[offset:offset + length].decode('utf8')
try:
value = str(value)
except UnicodeEncodeError:
pass
offset += length
elif kind == 's':
length = struct.unpack_from('B', encoded, offset)[0]
offset += 1
value = encoded[offset:offset + length].decode('utf8')
try:
value = str(value)
except UnicodeEncodeError:
pass
offset += length
elif kind == 't':
value = struct.unpack_from('>B', encoded, offset)[0]
value = bool(value)
offset += 1
elif kind == 'I':
value = struct.unpack_from('>i', encoded, offset)[0]
offset += 4
elif kind == 'l':
value = long(struct.unpack_from('>q', encoded, offset)[0])
offset += 8
elif kind == 'D':
decimals = struct.unpack_from('B', encoded, offset)[0]
offset += 1
raw = struct.unpack_from('>i', encoded, offset)[0]
offset += 4
value = decimal.Decimal(raw) * (decimal.Decimal(10)**-decimals)
elif kind == 'T':
value = datetime.utcfromtimestamp(
struct.unpack_from('>Q', encoded, offset)[0])
offset += 8
elif kind == 'F':
(value, offset) = decode_table(encoded, offset)
elif kind == 'A':
length = struct.unpack_from('>I', encoded, offset)[0]
offset += 4
offset_end = offset + length
value = []
while offset < offset_end:
v, offset = decode_value(encoded, offset)
value.append(v)
elif kind == 'V':
value = None
else:
raise exceptions.InvalidFieldTypeException(kind)
return value, offset
