org.apache.plc4x.java.simulated.utils.StaticHelper Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.plc4x.java.simulated.utils;

import org.apache.plc4x.java.api.value.PlcValue;
import org.apache.plc4x.java.spi.generation.ParseException;
import org.apache.plc4x.java.spi.generation.ReadBuffer;
import org.apache.plc4x.java.spi.generation.WriteBuffer;

import java.nio.charset.Charset;

public class StaticHelper {

    public static String parsePascalString(ReadBuffer io, String encoding) {
        try {
            // This is the maximum number of bytes a string can be long.
            short stringLength = io.readUnsignedShort(8);
            // Read the full size of the string.
            String str = io.readString(stringLength * 8, encoding);
            // Cut off the parts that don't belong to it.
            // TODO: shouldn't the above comment indicate that some code should appear here
            return str;
        } catch (ParseException e) {
            return null;
        }
    }

    public static void serializePascalString(WriteBuffer io, PlcValue value, String encoding) throws ParseException {
        final byte[] bytes = value.getString().getBytes(Charset.forName(encoding));
        try {
            if (bytes.length < 256) {
                io.writeByte((byte) bytes.length);
                for (byte aByte : bytes) {
                    io.writeByte(aByte);
                }
            } else {
                throw new ParseException("Error writing string, string > 255 bytes");
            }
        } catch (ParseException e) {
            throw new ParseException("Error writing string", e);
        }
    }

}