Android Open Source - TVRDecoder Decoder

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From Project

Back to project page TVRDecoder.

License

The source code is released under:

Apache License

Java Source Code

package se.blunden.tvrdecoder;
/* w ww.  j  a v  a 2 s.co  m*/
import java.util.ArrayList;

public class Decoder {
  
  private String[] tvr;
  private String[] tsi;
  
  public Decoder() {
    tvr = new String[40];
    tsi = new String[16];
    
    populateArrays();
  }
  
  public ArrayList<String> decodeTVR(String input_tvr) {
    
    String decoded;
    ArrayList<String> output = new ArrayList<String>(10); //decide on a good initial size
    for(int i = 0; i < input_tvr.length(); i++) {
      decoded = parseTVRDigit(i, String.valueOf(input_tvr.charAt(i)));
      if(!decoded.equals("")) {
        output.add(decoded);
      }
    }
      return output;
  }
  
  public ArrayList<String> decodeTSI(String input_tsi) {
    
    String decoded;
    ArrayList<String> output = new ArrayList<String>(10); //decide on a good initial size
    for(int i = 0; i < input_tsi.length(); i++) {
      decoded = parseTSIDigit(i, String.valueOf(input_tsi.charAt(i)));
      if(!decoded.equals("")) {
        output.add(decoded);
      }
    }
      return output;
  }
  
  private String parseTVRDigit(int i, String digit) {
    //convert hex to binary
    digit = Integer.toBinaryString(Integer.parseInt(digit, 16));
    
    int rb = 0;
    String ret = "";
    for(int b = digit.length() - 1; b >= 0; b--) {
      if(digit.charAt(b) == '1') {
        ret = tvr[i * 4 + 3 - rb];
      }
      rb++;
    }
    return ret;
  }
  
  private String parseTSIDigit(int i, String digit) {
    //convert hex to binary
    digit = Integer.toBinaryString(Integer.parseInt(digit, 16));
    
    int rb = 0;
    String ret = "";
    for(int b = digit.length() - 1; b >= 0; b--) {
      if(digit.charAt(b) == '1') {
        ret = tsi[i * 4 + 3 - rb];
      }
      rb++;
    }
    return ret;
  }
  
  //data from the EMV specification
  private void populateArrays() {
    
    //Terminal Verification Results
    tvr[0] = "Offline data authentication was not performed";
    tvr[1] = "SDA failed";
    tvr[2] = "ICC data missing";
    tvr[3] = "Card appears in terminal exception file";
    tvr[4] = "DDA failed";
    tvr[5] = "CDA failed";
    tvr[6] = "Reserved for future use";
    tvr[7] = "Reserved for future use";
    tvr[8] = "ICC and terminal have different application versions";
    tvr[9] = "Expired application";
    tvr[10] = "Application not yet effective";
    tvr[11] = "Requested service not allowed for card product";
    tvr[12] = "New card";
    tvr[13] = "Reserved for future use";
    tvr[14] = "Reserved for future use";
    tvr[15] = "Reserved for future use";
    tvr[16] = "Cardholder verification was not successful";
    tvr[17] = "Unrecognised CVM";
    tvr[18] = "PIN Try Limit exceeded";
    tvr[19] = "PIN entry required and PIN pad not present or not working";
    tvr[20] = "PIN entry required, PIN pad present but PIN was not entered";
    tvr[21] = "Online PIN entered";
    tvr[22] = "Reserved for future use";
    tvr[23] = "Reserved for future use";
    tvr[24] = "Transaction exceeds floor limit";
    tvr[25] = "Lower consecutive offline limit exceeded";
    tvr[26] = "Upper consecutive offline limit exceeded";
    tvr[27] = "Transaction selected randomly for online processing";
    tvr[28] = "Merchant forced transaction online";
    tvr[29] = "Reserved for future use";
    tvr[30] = "Reserved for future use";
    tvr[31] = "Reserved for future use";
    tvr[32] = "Default TDOL used";
    tvr[33] = "Issuer authentification failed";
    tvr[34] = "Script processing failed before final GENERATE AC";
    tvr[35] = "Script processing failed after final GENERATE AC";
    tvr[36] = "Reserved for future use";
    tvr[37] = "Reserved for future use";
    tvr[38] = "Reserved for future use";
    tvr[39] = "Reserved for future use";
    
    //Transaction Status Information
    tsi[0] = "Offline data authentication was performed";
    tsi[1] = "Cardholder verification was performed";
    tsi[2] = "Card risk managment was performed";
    tsi[3] = "Issuer authentication was performed";
    tsi[4] = "Terminal risk management was performed";
    tsi[5] = "Script processing was performed";
    tsi[6] = "Reserved for future use";
    tsi[7] = "Reserved for future use";
    tsi[8] = "Reserved for future use";
    tsi[9] = "Reserved for future use";
    tsi[10] = "Reserved for future use";
    tsi[11] = "Reserved for future use";
    tsi[12] = "Reserved for future use";
    tsi[13] = "Reserved for future use";
    tsi[14] = "Reserved for future use";
    tsi[15] = "Reserved for future use";
  }
}

Java Source Code List

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