Re: binary data and filterchain framework [was encrypting/decrypting]

[Alexey N. Solofnenko]

Yes, using special charsets seems like a hacking :-) .

- Alexey.

Antoine Levy-Lambert wrote:

Hello Alexey,

If I understand well, you suggest that instead of trying to write a file 
containing bytes which might not exist in the current encoding, that I actually 
write a sequence of translated hexa looking like this :

F6A310...

This solves the issue.

Regards,

Antoine
-------- Original-Nachricht --------
Datum: Tue, 20 Jun 2006 09:39:23 -0700
Von: "Alexey N. Solofnenko" <[EMAIL PROTECTED]>
An: Ant Users List <user@ant.apache.org>
Betreff: Re: binary data and filterchain framework [was encrypting/decrypting]

That is why I put a note to use hexadecimal conversion for encrypted strings.

  public static String asHex(byte buf[]) {
    if (buf==null)
      return null;
    StringBuffer strbuf=new StringBuffer(buf.length*2);
    for (int i=0, l=buf.length; i<l; i++) {
      int b=buf[i]&0xFF;
      if (b<0x10)
        strbuf.append('0');
      strbuf.append(Long.toString(b, 16));
    }
    return strbuf.toString();
  }

  public static byte[] fromHex(String str) {
    if (str==null)
      return null;
    final int strLen=str.length();
    byte[] buf=new byte[strLen/2];
    for (int i=0, j=0; i<strLen; i+=2, j++) {
      buf[j]= (byte)Integer.parseInt(str.substring(i, i+2), 16);
    }
    return buf;
  }


- Alexey.

Antoine Levy-Lambert wrote:

Hey,

I found something useful.

The problem in the round trip binary data ===> string ===> binary data
is that in standard western character sets, there are a lot of slots

which are marked "undefined". I had for instance a problem with 0x81 (decimal
129) which was transformed into 0x3f (question mark).

I found out that the Arabic Character Set Cp1256 has all slots used, so

can be used as a vehicle to do round trips with binary data using the

filterchain framework.

Regards,

Antoine

[1] http://www.microsoft.com/typography/unicode/1250.htm this char set

has empty slots

[2] http://www.microsoft.com/typography/unicode/1256.htm this char set

has no empty slots.

-------- Original-Nachricht --------
Datum: Tue, 20 Jun 2006 09:13:49 -0400
Von: Antoine Levy-Lambert <[EMAIL PROTECTED]>
An: Ant Users List <user@ant.apache.org>
Betreff: Re: Ant tasks to encrypt or decrypt passwords from property

files

Hello Alexey,

I have written something based on your code.
Actually, I wrote an ant task to create the key first.
I wanted to create filters (pluggable into filterchains) to encrypt and
decrypt, but I do not get that to work.
I might do an ant task to encrypt and a sort of loadproperties clone
which would take an encrypted file.
When I use filterchains and loadproperties, the decrypting does not
work, some of the bytes read by loadproperties (or the filterchain
framework) are not the same as the original.
Unfortunately, I am not litterate enough with streams, bytes, binary
operators and the like to know how to fix this. A shame, the solution
with filters would be elegant.

Regards,

Antoine

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