<?php
/**
 * Prints {@link http://magnet-uri.sf.net MAGNET} links for
 * specified files.  Uses
 * {@link http://bitzi.com/bitcollider/ bitcollider} if
 * installed, standalone functions if not.
 *
 * Demonstrates use of Bitcollider class and functions
 * available in bitcollider.php.
 */
include('bitcollider.php');

$USE_BITCOLLIDER = true;

function usage() {
  echo("Usage: php magnetlink.php [file ...]\n");
}

if ($argc < 2) {
  usage();
}

function bitcollide($file) {
  $b = new Bitcollider();
  if (!$b->analyze_file($file)) {
    return false;
  }
  $magnetlink = $b->get_magnetlink();
  echo("$magnetlink\n");
  return true;
}

function bitfallback($file) {
  $sha1_hex = sha1_file($file);
  $sha1_base32 = hex_to_base32($sha1_hex);
  $magnetlink = magnetlink($sha1_base32,$file,'','','');
  echo("$magnetlink\n");
}

foreach (array_slice($argv,1) as $arg) {
  if (!is_readable($arg)) {
    echo("Cannot read: ".$arg."\n");
    continue;
  }
  if ($USE_BITCOLLIDER) {
    if (!bitcollide($arg)) {
      $USE_BITCOLLIDER = false;
      bitfallback($arg);
    }
  } else {
    bitfallback($arg);
  }
}
?>