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Alpheus AFP Parser is a library and parser for the IBM Advanced Function Presentation (AFP) document/print stream format. Alpheus covers all AFP specifications: MO:DCA, BCOCA, CMOCA, FOCA, GOCA, IOCA, and PTOCA. It is a complete implementation. Every Structured Field, Repeating Group, and Triplet is fully implemented as Java class. Alpheus AFP Parser was written from scratch and has no external dependencies. Copyright 2015,2016 Rudolf Fiala Alpheus AFP Parser is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

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/*
Copyright 2015 Rudolf Fiala

This file is part of Alpheus AFP Parser.

Alpheus AFP Parser is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Alpheus AFP Parser is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Alpheus AFP Parser.  If not, see 
*/
package com.mgz.afp.modca;

import com.mgz.afp.base.IRepeatingGroup;
import com.mgz.afp.base.StructuredFieldBaseRepeatingGroups;
import com.mgz.afp.exceptions.AFPParserException;
import com.mgz.afp.parser.AFPParserConfiguration;
import com.mgz.util.Constants;
import com.mgz.util.UtilBinaryDecoding;
import com.mgz.util.UtilCharacterEncoding;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * MO:DCA, page 295.
 
 The Map Page Segment structured field identifies page segments that
 * are required to present a page on a physical medium.
 */
public class MPS_MapPageSegment extends StructuredFieldBaseRepeatingGroups {
  short lengthOfRepeatingGroup;
  byte[] reserved1_3 = new byte[3];

  @Override
  public void decodeAFP(byte[] sfData, int offset, int length, AFPParserConfiguration config) throws AFPParserException {
    lengthOfRepeatingGroup = UtilBinaryDecoding.parseShort(sfData, offset, 1);
    reserved1_3 = new byte[3];
    System.arraycopy(sfData, offset + 1, reserved1_3, 0, reserved1_3.length);

    int actualLength = getActualLength(sfData, offset, length);
    if (actualLength > 4) {
      int pos = 4;
      while (pos < actualLength) {
        MPS_RepeatingGroup rg = new MPS_RepeatingGroup();
        rg.decodeAFP(sfData, offset + pos, actualLength - pos, config);
        addRepeatingGroup(rg);
        pos += lengthOfRepeatingGroup;
      }
    } else {
      repeatingGroups = null;
    }
  }


  @Override
  public void writeAFP(OutputStream os, AFPParserConfiguration config) throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    baos.write(lengthOfRepeatingGroup);
    baos.write(reserved1_3);
    if (repeatingGroups != null) {
      for (IRepeatingGroup rg : repeatingGroups) {
        rg.writeAFP(baos, config);
      }
    }

    writeFullStructuredField(os, baos.toByteArray());
  }

  public short getLengthOfRepeatingGroup() {
    return lengthOfRepeatingGroup;
  }

  public void setLengthOfRepeatingGroup(short lengthOfRepeatingGroup) {
    this.lengthOfRepeatingGroup = lengthOfRepeatingGroup;
  }

  public byte[] getReserved1_3() {
    return reserved1_3;
  }

  public void setReserved1_3(byte[] reserved1_3) {
    this.reserved1_3 = reserved1_3;
  }

  public static class MPS_RepeatingGroup implements IRepeatingGroup {
    byte[] reserved0_3 = new byte[4];
    String nameOfPageSegment;

    @Override
    public void decodeAFP(byte[] sfData, int offset, int length, AFPParserConfiguration config) throws AFPParserException {
      checkDataLength(sfData, offset, length, 12);
      reserved0_3 = new byte[4];
      System.arraycopy(sfData, offset, reserved0_3, 0, reserved0_3.length);
      nameOfPageSegment = new String(sfData, offset + 4, 8, config.getAfpCharSet());
    }


    @Override
    public void writeAFP(OutputStream os, AFPParserConfiguration config) throws IOException {
      os.write(reserved0_3);
      os.write(UtilCharacterEncoding.stringToByteArray(nameOfPageSegment, config.getAfpCharSet(), 8, Constants.EBCDIC_ID_FILLER));
    }
  }
}