Пример #1
0
def encode_value_length(value_length, writer):
    """Enocde the length of a value as a
    var_width length. This will be the smallest of
    a byte, short or int which can hold the length.

    Arguments:
        value_length: the length in buytes of the value object
        writer: the writer object to write the length to

    """
    assert value_length >= 0 and value_length <= utils.MAX_INT

    if value_length <= utils.MAX_BYTE:
        writer.write(codecs.enc_byte(value_length))
    elif value_length <= utils.MAX_SHORT:
        writer.write(codecs.enc_short(value_length))
    else:
        writer.write(codecs.enc_int(value_length))
Пример #2
0
def encode_value_length(value_length, writer):
    """Enocde the length of a value as a
    var_width length. This will be the smallest of
    a byte, short or int which can hold the length.

    Arguments:
        value_length: the length in buytes of the value object
        writer: the writer object to write the length to

    """
    assert value_length >= 0 and value_length <= utils.MAX_INT

    if value_length <= utils.MAX_BYTE:
        writer.write(codecs.enc_byte(value_length))
    elif value_length <= utils.MAX_SHORT:
        writer.write(codecs.enc_short(value_length))
    else:
        writer.write(codecs.enc_int(value_length))
Пример #3
0
    def encode(self, writer, taxonomy=None):
        """Encode a Field.

        This encodes Field Prefix, Type, Ordinal, Name, Data

        """
        variable_width = 0
        if self.type_.is_variable_sized:
            if self.is_type(types.FUDGEMSG_TYPE_ID):
                # sub-message, need to be taxonomy aware
                value_length = self.type_.calc_size(self.value, taxonomy)
            else:
                value_length = self.type_.calc_size(self.value)
            variable_width = bytes_for_value_length(value_length)

        ordinal = self.ordinal
        name = self.name
        if taxonomy and self.name:
            tax_ord = taxonomy.get_ordinal(self.name)
            if tax_ord:
                ordinal = tax_ord
                name = None

        prefix_byte = prefix.encode_prefix(not self.type_.is_variable_sized, \
                variable_width, ordinal is not None, name is not None)

        # And write it out
        writer.write(chr(prefix_byte))
        writer.write(codecs.enc_byte(self.type_.type_id))
        if ordinal is not None:
            writer.write(codecs.enc_short(ordinal))
        if name:
            assert len(name) <= utils.MAX_BYTE
            writer.write(codecs.enc_name(name))

        if self.type_.is_variable_sized:
            encode_value_length(value_length, writer)

        if self.is_type(types.FUDGEMSG_TYPE_ID):
            self.value.encode(writer, taxonomy)
        else:
            writer.write(self.type_.encoder(self.value))
Пример #4
0
    def encode(self, writer, taxonomy=None):
        """Encode a Field.

        This encodes Field Prefix, Type, Ordinal, Name, Data

        """
        variable_width = 0
        if self.type_.is_variable_sized:
            if self.is_type(types.FUDGEMSG_TYPE_ID):
                # sub-message, need to be taxonomy aware
                value_length = self.type_.calc_size(self.value, taxonomy)
            else:
                value_length = self.type_.calc_size(self.value)
            variable_width = bytes_for_value_length(value_length)

        ordinal = self.ordinal
        name = self.name
        if taxonomy and self.name:
            tax_ord = taxonomy.get_ordinal(self.name)
            if tax_ord:
                ordinal = tax_ord
                name = None

        prefix_byte = prefix.encode_prefix(not self.type_.is_variable_sized, \
                variable_width, ordinal is not None, name is not None)

        # And write it out
        writer.write(chr(prefix_byte))
        writer.write(codecs.enc_byte(self.type_.type_id))
        if ordinal is not None:
            writer.write(codecs.enc_short(ordinal))
        if name:
            assert len(name) <= utils.MAX_BYTE
            writer.write(codecs.enc_name(name))

        if self.type_.is_variable_sized:
            encode_value_length(value_length, writer)

        if self.is_type(types.FUDGEMSG_TYPE_ID):
            self.value.encode(writer, taxonomy)
        else:
            writer.write(self.type_.encoder(self.value))