This solution is also flawed. Check with Batman_Kane.jpg
I recommend using org.apache.commons.codec.digest.DigestUtils#md5Hex
Relying on a commonly used library is a lot less bug prone.
On Mon, Dec 5, 2011 at 4:17 PM, Tommy Chheng <tommy.chh...@gmail.com> wrote:
> Thanks to the folks on the wikipedia api mailing list, the problem was
> that the leading zero was being eaten.
>
> This will fix it in ImageExtractor#getImageUrl:
>
> val result = (new BigInteger(1, messageDigest)).toString(16)
> val md5 = if (result.length % 2 != 0) "0" + result else result
>
> I would submit a patch but i'm unsure how to do so.
>
>
> On Sat, Dec 3, 2011 at 6:38 PM, Tommy Chheng <tommy.chh...@gmail.com> wrote:
>> I'm using ImageExtractor#getImageUrl in the extraction_framework to
>> get the url of an image.
>>
>> val md = MessageDigest.getInstance("MD5")
>> val messageDigest = md.digest(fileName.getBytes)
>> val md5 = (new BigInteger(1, messageDigest)).toString(16)
>>
>> val hash1 = md5.substring(0, 1)
>> val hash2 = md5.substring(0, 2);
>>
>> val urlPart = hash1 + "/" + hash2 + "/" + fileName
>>
>> Most of the time, the function works correctly but on a few cases, it
>> is incorrect:
>>
>> For "Stewie_Griffin.png", I get 2/26/Stewie_Griffin.png but the real
>> one is 0/02/Stewie_Griffin.png
>>
>> The source file info is here:
>> http://en.wikipedia.org/wiki/File:Stewie_Griffin.png
>> http://upload.wikimedia.org/wikipedia/en/0/02/Stewie_Griffin.png
>>
>> Any ideas why the hashing scheme doesn't work sometimes?
>>
>> --
>> @tommychheng
>> http://tommy.chheng.com
>
>
>
> --
> @tommychheng
> http://tommy.chheng.com
--
@tommychheng
http://tommy.chheng.com
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