lolka84

package ru.korshun.imgcrypto;


import java.io.*;


public class ImgCrypto {


    public static void main(String[] args) {


        ImgCrypto ic = new ImgCrypto();


            try {

                byte[] enc = ic.load();

                String e = ic.encode(enc);


                    try (OutputStream out = new FileOutputStream("D:\\java\\ImgCrypto\\img\\image.jpg")) {

                        out.write(ic.decode(e));

                    }


            } catch (IOException e) { }


}



public byte[] load() throws FileNotFoundException, IOException {


    InputStream in = new FileInputStream("D:\\java\\ImgCrypto\\img\\20130826_103942.jpg");

    ByteArrayOutputStream bout = new ByteArrayOutputStream();

    byte[] buffer = new byte[32 * 1024];


        while (true) {

            int r = in.read(buffer);

                if (r > 0) { bout.write(buffer, 0, r); }

                else { break; }

        }


    bout.close();


    return bout.toByteArray();

}


//——————————————————-


 public final String encode(byte[] d) {

        if (d == null) return null;

    byte data[] = new byte[d.length+2];

    System.arraycopy(d, 0, data, 0, d.length);

    byte dest[] = new byte[(data.length/3)*4];


        // 3-byte to 4-byte conversion

        for (int sidx = 0, didx=0; sidx < d.length; sidx += 3, didx += 4) {

            dest[didx]   = (byte) ((data[sidx] >>> 2) & 077);

            dest[didx+1] = (byte) ((data[sidx+1] >>> 4) & 017 | (data[sidx] << 4) & 077);

            dest[didx+2] = (byte) ((data[sidx+2] >>> 6) & 003 | (data[sidx+1] << 2) & 077);

            dest[didx+3] = (byte) (data[sidx+2] & 077);

        }


        for (int idx = 0; idx < dest.length; idx++) {

            if (dest[idx] < 26)         { dest[idx] = (byte)(dest[idx] + 'A'); }

            else if (dest[idx] < 52)    { dest[idx] = (byte)(dest[idx] + 'a' - 26); }

            else if (dest[idx] < 62)    { dest[idx] = (byte)(dest[idx] + '0' - 52); }

            else if (dest[idx] < 63)    { dest[idx] = (byte)'+'; }

            else                        { dest[idx] = (byte)'/'; }

        }


        for (int idx = dest.length-1; idx > (d.length*4)/3; idx--) { dest[idx] = (byte)'='; }


    return new String(dest);


  }


  public final String encode(String s) { return encode(s.getBytes()); }



  public final byte[] decode(String str) {

        if (str == null)  { return  null; }

      byte data[] = str.getBytes();

      return decode(data);

  }


  public final static byte[] decode(byte[] data) {

      int tail = data.length;

          while (data[tail-1] == '=') { tail--; }

      byte dest[] = new byte[tail - data.length/4];


          for (int idx = 0; idx <data.length; idx++) {

              if (data[idx] == '=')                             { data[idx] = 0; }

              else if (data[idx] == '/')                        { data[idx] = 63; }

              else if (data[idx] == '+')                        { data[idx] = 62; }

              else if (data[idx] >= '0'  &&  data[idx] <= '9')  { data[idx] = (byte)(data[idx] - ('0' - 52)); }

              else if (data[idx] >= 'a'  &&  data[idx] <= 'z')  { data[idx] = (byte)(data[idx] - ('a' - 26)); }

              else if (data[idx] >= 'A'  &&  data[idx] <= 'Z')  { data[idx] = (byte)(data[idx] - 'A'); }

          }


          int sidx, didx;

          for (sidx = 0, didx=0; didx < dest.length-2; sidx += 4, didx += 3) {

              dest[didx] =      (byte) (((data[sidx] << 2) & 255) | ((data[sidx+1] >>> 4) & 3));

              dest[didx+1] =    (byte) (((data[sidx+1] << 4) & 255) | ((data[sidx+2] >>> 2) & 017));

              dest[didx+2] =    (byte) (((data[sidx+2] << 6) & 255) | (data[sidx+3] & 077));

          }

          if (didx < dest.length) { dest[didx] =      (byte) (((data[sidx] << 2) & 255) | ((data[sidx+1] >>> 4) & 3)); }

          if (++didx < dest.length) { dest[didx] =    (byte) (((data[sidx+1] << 4) & 255) | ((data[sidx+2] >>> 2) & 017)); }


      return dest;


  }


}

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$("ul",this).stop(true,true).show(400);


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