Encoding::Converter#==

static VALUE
econv_equal(VALUE self, VALUE other)
{
    rb_econv_t *ec1 = check_econv(self);
    rb_econv_t *ec2;
    int i;

    if (!rb_typeddata_is_kind_of(other, &econv_data_type)) {
        return Qnil;
    }
    ec2 = DATA_PTR(other);
    if (!ec2) return Qfalse;
    if (ec1->source_encoding_name != ec2->source_encoding_name &&
        strcmp(ec1->source_encoding_name, ec2->source_encoding_name))
        return Qfalse;
    if (ec1->destination_encoding_name != ec2->destination_encoding_name &&
        strcmp(ec1->destination_encoding_name, ec2->destination_encoding_name))
        return Qfalse;
    if (ec1->flags != ec2->flags) return Qfalse;
    if (ec1->replacement_enc != ec2->replacement_enc &&
        strcmp(ec1->replacement_enc, ec2->replacement_enc))
        return Qfalse;
    if (ec1->replacement_len != ec2->replacement_len) return Qfalse;
    if (ec1->replacement_str != ec2->replacement_str &&
        memcmp(ec1->replacement_str, ec2->replacement_str, ec2->replacement_len))
        return Qfalse;

    if (ec1->num_trans != ec2->num_trans) return Qfalse;
    for (i = 0; i < ec1->num_trans; i++) {
        if (ec1->elems[i].tc->transcoder != ec2->elems[i].tc->transcoder)
            return Qfalse;
    }
    return Qtrue;
}