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From "Alexey N. Solofnenko" <A.Solofne...@mdl.com>
Subject Re: binary data and filterchain framework [was encrypting/decrypting]
Date Tue, 20 Jun 2006 17:48:13 GMT
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" <A.Solofnenko@mdl.com>
> 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 <antoine@gmx.de>
>>> 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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>>>   
>>>       
>
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