com.digitalpetri.enip.cip.epath.DataSegment Maven / Gradle / Ivy
package com.digitalpetri.enip.cip.epath;
import io.netty.buffer.ByteBuf;
import java.nio.charset.Charset;
public abstract class DataSegment extends EPathSegment {
public static final int SEGMENT_TYPE = 0x80;
protected abstract ByteBuf encode(ByteBuf buffer);
public static ByteBuf encode(DataSegment segment, boolean padded, ByteBuf buffer) {
return segment.encode(buffer);
}
public static final class AnsiDataSegment extends DataSegment {
public static final int SUBTYPE = 0x11;
private static final Charset ASCII = Charset.forName("US-ASCII");
private final String data;
public AnsiDataSegment(String data) {
this.data = data;
}
@Override
protected ByteBuf encode(ByteBuf buffer) {
String data = this.data.length() <= 255 ?
this.data : this.data.substring(0, 255);
buffer.writeByte(SEGMENT_TYPE | SUBTYPE);
buffer.writeByte(data.length());
buffer.writeBytes(data.getBytes(ASCII));
if (data.length() % 2 != 0) buffer.writeByte(0);
return buffer;
}
}
public static final class SimpleDataSegment extends DataSegment {
private final short[] data;
public SimpleDataSegment(short[] data) {
this.data = data;
}
@Override
protected ByteBuf encode(ByteBuf buffer) {
buffer.writeByte(SEGMENT_TYPE);
buffer.writeByte(data.length);
for (short d : data) {
buffer.writeShort(d);
}
return buffer;
}
}
}