Sample Java class to test the keystore support

TestKeyStore.java

/**
 * Sample Java class to test the keystore support
 */

package net.fabiocigliano.test.keystore;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.nio.ByteBuffer;

/**
 * @author fabiocigliano
 *
 */
public final class TestKeyStore {
	
	private final static int LENGTH = 20;
	private final static int ncol = 4;
	
	public static byte cast(int num) {
		return (byte) ( num & 0xFF );
	}
	
	public static void writeTestKeystore(File filename) throws FileNotFoundException, IOException {
		FileOutputStream out = new FileOutputStream(filename);
		for(int i=0; i<LENGTH; i++) {
			out.write( cast(i) );
		}
		out.flush();
		out.close();
	}
	
	public static void dumpBytes(InputStream is, int length) throws IOException {
		int buf;
		int cont = 0;
		ByteBuffer buffer = ByteBuffer.allocate( length );
		while(
//			(buf=is.read()) != -1 &&
			cont<length
			) {
			buf=is.read();
			buffer.put( (byte) buf );
//			cast(buf) );
			cont++;
		}
//		System.out.println("reached EOF - End of Stream "+buf);
		dumpBytes(buffer.array(), length);
	}
	
	private static void dumpBytes(byte[] array, int limit) {
		StringBuilder b;
		String temp;
		for(int i=0; i<array.length && i<limit; ) {
			b = new StringBuilder();
			int tmpi = 0;
			for(int j=0; j<ncol && i+j<array.length; j++) {
				b.append( String.format("%1$#" + 12 + "s", array[i+j] ) );  
				b.append(" ");
	    		tmpi = (int) ( (tmpi<<8) | (array[i+j] & 0xff) );
			}
	    	temp = "0000000000000"+Integer.toHexString( new Integer(tmpi) );
	    	temp = "0x"+temp.substring(temp.length()-8);
	    	b.append( String.format("%1$#" + 20 + "s", temp ) );
			i = i + ncol;
			System.out.println(b.toString());
		}
	}
	
	private static void dumpInteger(InputStream is, int length) throws IOException {
		InputStreamReader isr = new InputStreamReader(is);
		char[] buf = new char[8];
		int i=0;
		while( isr.read(buf)>0 && i < length ) {
			String temp = new String(buf);
			BigInteger big = new BigInteger(temp, 16);
			String s = Integer.toString( big.intValue() );
			System.out.print( String.format("%1$#" + 51 + "s", s ) );
			System.out.print(" ");
			System.out.println( String.format("%1$#" + 20 + "s", "0x"+temp ) );
			i++;
		}
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {
		
		String filename;
		
		filename = "cacert.org.bks";
		
		File f = new File("/tmp",filename);
		if( !f.exists() ) {
			writeTestKeystore(f);
		}
		
		System.out.println("File di input:");
		System.out.println("size: "+f.length());
		FileInputStream fis = new FileInputStream(f);
		dumpBytes(fis, LENGTH);
		
		System.out.println("File codificato:");
		KeyStoreEncoder encoder = new KeyStoreEncoder(f);
		System.out.println("size: "+encoder.size());
		dumpInteger(encoder, LENGTH/4);
		
		FileOutputStream out1 = new FileOutputStream("/tmp/cert_enc.txt");
		encoder.reset();
		encoder.writeStream(out1);
		out1.close();
		
		System.out.println("File decodificato:");
		encoder.reset();
		KeyStoreDecoder decoder = new KeyStoreDecoder(encoder);
		System.out.println("size: "+decoder.size());
		dumpBytes(decoder, LENGTH);
		
		FileOutputStream out = new FileOutputStream("/tmp/cert_decr.bks");
		decoder.reset();
		decoder.writeStream(out);
		out.close();
	}

}