.adwind file decoder

/*
 .adwind -file decoder
 1st compile
    javac decoder.java
 2nd find the password/key, usually found in the file ID
 3rd run the decoder:
    java decoder password file [file2] [file3...]
*/

import java.io.*;
import java.util.zip.GZIPInputStream;


public class decoder {
    private static String pass;
    public static void main (String[] args) {
        if (args.length < 2) {
            System.out.println("Usage: java decoder pass file1 [file2]...");
            return ;
        }
        pass = args[0];
        try{
            for (int i = 1; i<args.length; i++){
                String filename = args[i];
                String extension = filename.substring(filename.lastIndexOf("."));
                filename = filename.substring(0, filename.lastIndexOf("."));
                byte[] data = loadClassData(args[i]);
                FileOutputStream fos = new FileOutputStream(new File(filename + ".decompiled" + extension));
                BufferedOutputStream bos = new BufferedOutputStream(fos);
                bos.write(data);
                bos.close();
                System.out.println("Wrote output to "+ filename +".decompiled" + extension + "; data length: " + data.length);
            }
        }catch (Exception ex) {
            System.out.print(ex);
        }
    }

    public static byte[] loadClassData(String name) throws Exception
    {
        byte tmp[];
        tmp = null;
        try {
            InputStream m;
            ByteArrayOutputStream b;
            m = decoder.class.getClassLoader().getResourceAsStream(name);
            b = new ByteArrayOutputStream();
            byte buf[] = new byte[1024];
            int i;
            while((i = m.read(buf)) > -1) {
                b.write(buf, 0, i);
            }
            b.close();
            byte c[] = b.toByteArray();
            System.out.println("Decoding file " + name);
            tmp = decode(pass, b.toByteArray());
            System.out.println("Trying to decompress...");
            return decompress(tmp);
        } catch (IOException ioEx) {
            return tmp;
        } catch (Exception ex) {
            ex.printStackTrace();
            throw ex;
        }

    }

    public static byte[] decompress(byte tmp[]) throws Exception
    {
        try{
            ByteArrayOutputStream out;
            ByteArrayInputStream in = new ByteArrayInputStream(tmp);
            GZIPInputStream inn = new GZIPInputStream(in);
            out = new ByteArrayOutputStream();
            byte buf[] = new byte[1024];
            int i;
            while((i = inn.read(buf)) > -1)
                out.write(buf, 0, i);
            out.close();
            return out.toByteArray();
        }catch(Exception ex){
            System.out.println("Failed to decompress, maybe the file wasn't an archive");
            throw ex;
        }
    }

    public static byte[] decode(String key, byte inp[])
    {
        int Sbox[] = new int[257];
        int Sbox2[] = new int[257];
        int i = 0;
        int j = 0;
        char k = '\0';
        int t = 0;
        int x = 0;
        char temp = '\0';
        for(i = 0; i < 256; i++)
            Sbox[i] = i;

        j = 0;
        for(i = 0; i < 256; i++) {
            if(j == key.length())
                j = 0;
            Sbox2[i] = key.charAt(j++);
        }
        j = 0;
        for(i = 0; i < 256; i++) {
            j = (j + Sbox[i] + Sbox2[i]) % 256;
            temp = (char)Sbox[i];
            Sbox[i] = Sbox[j];
            Sbox[j] = temp;
        }

        i = j = 0;
        for(x = 0; x < inp.length; x++) {
            i = (i + 1) % 256;
            j = (j + Sbox[i]) % 256;
            temp = (char)Sbox[i];
            Sbox[i] = Sbox[j];
            Sbox[j] = temp;
            t = (Sbox[i] + Sbox[j]) % 256;
            k = (char)Sbox[t];
            inp[x] = (byte)(inp[x] ^ k);
        }

        return inp;
    }

}