Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.io.ByteArrayInputStream;

public class Main {
    /**
     * read length value from EMV tag bytestream
     * 
     * source: https://code.google.com/p/javaemvreader/
     * 
     * @param stream
     * @return
     */
    private static int readTagLength(ByteArrayInputStream stream) {
        // Find LENGTH bytes
        int length;
        int tmpLength = stream.read();

        if (tmpLength <= 127) { // 0111 1111
            // short length form
            length = tmpLength;
        } else if (tmpLength == 128) { // 1000 0000
            // length identifies indefinite form, will be set later
            length = tmpLength;
        } else {
            // long length form
            int numberOfLengthOctets = tmpLength & 127; // turn off 8th bit
            tmpLength = 0;
            for (int i = 0; i < numberOfLengthOctets; i++) {
                int nextLengthOctet = stream.read();
                tmpLength <<= 8;
                tmpLength |= nextLengthOctet;
            }
            length = tmpLength;
        }
        return length;
    }
}