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Magnet Link

, 5 Jan 2010 CPOL
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This PHP function return the urn (Uniform Resource Name) formed from the content hash of a particular torrent file. The urn refering to the Base32 encoded hash of the file.function base32_encode ($hash){$outString = '';$compBits = '';$BASE32_TABLE = array( ...
This PHP function return the urn (Uniform Resource Name) formed from the content hash of a particular torrent file. The urn refering to the Base32 encoded hash of the file.

function base32_encode ($hash)
{
$outString = '';
$compBits = '';
$BASE32_TABLE = array(
                         '00000' => 0x61,
                         '00001' => 0x62,
                         '00010' => 0x63,
                         '00011' => 0x64,
                         '00100' => 0x65,
                         '00101' => 0x66,
                         '00110' => 0x67,
                         '00111' => 0x68,
                         '01000' => 0x69,
                         '01001' => 0x6a,
                         '01010' => 0x6b,
                         '01011' => 0x6c,
                         '01100' => 0x6d,
                         '01101' => 0x6e,
                         '01110' => 0x6f,
                         '01111' => 0x70,
                         '10000' => 0x71,
                         '10001' => 0x72,
                         '10010' => 0x73,
                         '10011' => 0x74,
                         '10100' => 0x75,
                         '10101' => 0x76,
                         '10110' => 0x77,
                         '10111' => 0x78,
                         '11000' => 0x79,
                         '11001' => 0x7a,
                         '11010' => 0x32,
                         '11011' => 0x33,
                         '11100' => 0x34,
                         '11101' => 0x35,
                         '11110' => 0x36,
                         '11111' => 0x37,
                         );
 
   /* Turn the compressed string into a string that represents the bits as 0 and 1. */
   for ($i = 0; $i < strlen($hash); $i++) {
       $compBits .= str_pad(decbin(ord(substr($hash,$i,1))), 8, '0', STR_PAD_LEFT);
   }
 
   /* Pad the value with enough 0's to make it a multiple of 5 */
   if((strlen($compBits) % 5) != 0) {
       $compBits = str_pad($compBits, strlen($compBits)+(5-(strlen($compBits)%5)), '0', STR_PAD_RIGHT);
   }
 
   /* Create an array by chunking it every 5 chars */
   $fiveBitsArray = split("\n",rtrim(chunk_split($compBits, 5, "\n")));
 
   /* Look-up each chunk and add it to $outstring */
   foreach($fiveBitsArray as $fiveBitsString) {
       $outString .= chr($BASE32_TABLE[$fiveBitsString]);
   }
 
   return $outString;
 
}

Parametres:

dn - Filename

xl - Size in bytes

xt - urn containing file hash

as - Web link to the file online

xs - P2P link

kt - Key words for search

mt - link to the metafile that contains a list of magneto

xt is the most important part of magnet links.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Comments and Discussions

 
GeneralArray Pin
zafar j15-May-10 21:55
memberzafar j15-May-10 21:55 
GeneralMy vote of 2 Pin
Tusar ranjan Patra21-Apr-10 0:37
memberTusar ranjan Patra21-Apr-10 0:37 

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