DecodingClass.java

package com.ant;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;


public class DecodingClass {

	//String header = "package com.android.m;\nimport android.content.Context;\npublic class M { \n";
	//String dec = "	public static String d(byte[] ebytes, byte[] obytes){\n        for (int i = 0; i < obytes.length; i++) {\n            ebytes[i] = (byte) (ebytes[i] ^ obytes[i]);\n        }\n    return new String(ebytes);\n    }\n\n";
	
	//String h2b = "	public static byte[] h2b(final String s) {\n		final byte[] b = new byte[s.length() / 2];\n		for (int i = 0; i < b.length; i++) {\n			final int index =  i * 2;\n			final int v = Integer.parseInt(s.substring(index, index + 2), 16);\n			b[i] = (byte) v;\n		}\n		return b;\n	}\n";
	FileOutputStream fout;

	public DecodingClass(String filename, String headerFile) {

		File classFile = new File(filename);
		classFile.getParentFile().mkdirs();

		try {
			FileInputStream fin = new FileInputStream(headerFile);
			String mIn = new String(inputStreamToBuffer(fin, 0));
			if(mIn.endsWith("\n}\n")){
				mIn=mIn.substring(0, mIn.length() -2);
			}
			if(mIn.endsWith("\n}\r\n")){
				mIn=mIn.substring(0, mIn.length() -3);
			}
			if(mIn.endsWith("\n}")){
				mIn=mIn.substring(0, mIn.length() -1);
			}
			
			fout = new FileOutputStream(classFile);
			fout.write(mIn.getBytes());

		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void append(String method, byte[] ebytes, byte[] kbytes) {

		try {
			String m1 = "    public static String " + method +"(String enc){\n";
			String m2 = "        return d(h2b(enc),h2b(\"KY" + Utils.byteArrayToHexString(kbytes) + "\" ));\n    }\n";
			fout.write(m1.getBytes());
			fout.write(m2.getBytes());

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

	public void close() {
		try {
			fout.write("}\n".getBytes());
			fout.close();

		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}
	
	public static final byte[] inputStreamToBuffer(final InputStream iStream, final int offset) {
		try {
			int i;

			final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1024);

			byte[] buffer = new byte[1024];

			if (offset > 0) {
				byte[] discard = new byte[offset];
				iStream.read(discard);
				discard = null;
			}

			while ((i = iStream.read(buffer)) != -1) {
				byteArrayOutputStream.write(buffer, 0, i);
			}

			iStream.close();

			return byteArrayOutputStream.toByteArray();
		} catch (final IOException e) {
			e.printStackTrace();

			return null;
		}
	}

}