def _encode_data(entry, value, length):
if entry.format in (Field.BINARY, Field.HEX):
assert isinstance(value, Data)
result = value.copy()
elif entry.format == Field.TEXT:
assert isinstance(value, basestring)
try:
result = Data(value.encode(entry.encoding))
except UnicodeDecodeError:
raise BadEncodingError(entry, value)
elif entry.format == Field.INTEGER:
assert isinstance(value, (int, long))
if length is None:
raise FieldDataError(entry, "Unable to encode integer field " "without explicit length")
assert entry.encoding in [Field.BIG_ENDIAN, Field.LITTLE_ENDIAN]
if entry.encoding == Field.BIG_ENDIAN:
result = Data.from_int_big_endian(value, length)
else:
result = Data.from_int_little_endian(value, length)
elif entry.format == Field.FLOAT:
assert entry.encoding in [Field.BIG_ENDIAN, Field.LITTLE_ENDIAN]
assert isinstance(value, float)
if entry.encoding == Field.BIG_ENDIAN:
result = Data.from_float_big_endian(value, length)
else:
result = Data.from_float_little_endian(value, length)
else:
raise Exception("Unknown field format of '%s'!" % entry.format)
return result
def _encode_unknown_variable_length_integer(entry, value, params):
# Integers require a specific length of encoding. If one is
# not specified, we'll try several lengths until we find one
# that fits.
#
# We only consider lengths that are in the range specified by
# the entry length to avoid choosing an out of bounds length.
assert params is not None, "Asked to encode a variable length field " \
"without parameters. This shouldn't happen."
for length in get_valid_integer_lengths(entry, params):
try:
if entry.format != Field.INTEGER or entry.encoding == Field.BIG_ENDIAN:
result = Data.from_int_big_endian(value, length)
return result
else:
return Data.from_int_little_endian(value, length)
except IntegerTooLongError:
# The value didn't fit in this length... try the next
# one.
pass
else:
raise VariableIntegerTooLongError(entry, value)
