com.bytezone.dm3270.replyfield.UsableArea Maven / Gradle / Ivy

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This is a trimmed down version of https://github.com/dmolony/dm3270 to be used as TN3270 client library
There is a newer version: 0.9.1
package com.bytezone.dm3270.replyfield;

import com.bytezone.dm3270.display.ScreenDimensions;
import com.bytezone.dm3270.utilities.Dm3270Utility;

public class UsableArea extends QueryReplyField {

  private static String[] measurementUnits = {"Inches", "Millimetres"};
  private static String[] addressingModes =
      {"Reserved", "12/14 bit", "Reserved", "12/14/16 bit", "Unmapped"};
  private byte flags1;
  private byte flags2;
  private int addressingMode;
  private int width;
  private int height;
  private byte unitsOfMeasurement;
  private int xUnits;
  private int yUnits;
  private int xNumerator;
  private int xDenominator;
  private int yNumerator;
  private int yDenominator;
  private int bufferSize;

  public UsableArea(int rows, int columns) {
    super(USABLE_AREA_REPLY);

    // leave a gap for the screen size fields
    byte[] rest = {0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, (byte) 0xD3, 0x03,
        0x20, 0x00, (byte) 0x9E, 0x02, 0x58, 0x07, 0x0C, 0x07, (byte) 0x80};

    int ptr = createReply(rest.length);

    for (byte b : rest) {
      reply[ptr++] = b;
    }

    // copy the screen dimensions into the reply (skipping 4 header bytes)
    Dm3270Utility.packUnsignedShort(columns, reply, 6);
    Dm3270Utility.packUnsignedShort(rows, reply, 8);
    Dm3270Utility.packUnsignedShort(1920, reply, 21);

    checkDataLength(ptr);
  }

  public UsableArea(byte[] buffer) {
    super(buffer);

    assert data[1] == USABLE_AREA_REPLY;

    flags1 = data[2];
    flags2 = data[3];
    width = Dm3270Utility.unsignedShort(data, 4);
    height = Dm3270Utility.unsignedShort(data, 6);
    unitsOfMeasurement = data[8];
    xNumerator = Dm3270Utility.unsignedShort(data, 9);
    xDenominator = Dm3270Utility.unsignedShort(data, 11);
    yNumerator = Dm3270Utility.unsignedShort(data, 13);
    yDenominator = Dm3270Utility.unsignedShort(data, 15);
    xUnits = data[17] & 0xFF;
    yUnits = data[18] & 0xFF;

    if (data.length >= 20) {
      bufferSize = Dm3270Utility.unsignedShort(data, 19);
    }

    addressingMode = flags1 & 0x0F;
    if (addressingMode == 15) {
      addressingMode = 4;
    }
  }

  public ScreenDimensions getScreenDimensions() {
    return new ScreenDimensions(height, width);
  }

  @Override
  public String toString() {
    StringBuilder text = new StringBuilder(super.toString());

    text.append(String.format("%n  flags1     : %02X", flags1));
    text.append(String.format("%n  ad mode    : %s", addressingModes[addressingMode]));
    text.append(String.format("%n  flags2     : %02X", flags2));
    text.append(String.format("%n  width      : %d", width));
    text.append(String.format("%n  height     : %d", height));
    text.append(String.format("%n  units      : %d - %s", unitsOfMeasurement,
        measurementUnits[unitsOfMeasurement]));
    text.append(String.format("%n  x ratio    : %d / %d", xNumerator, xDenominator));
    text.append(String.format("%n  y ratio    : %d / %d", yNumerator, yDenominator));
    text.append(String.format("%n  x units    : %d", xUnits));
    text.append(String.format("%n  y units    : %d", yUnits));
    if (bufferSize > 0) {
      text.append(String.format("%n  buffer     : %d", bufferSize));
    }

    return text.toString();
  }

}