first commit

.htaccess

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+RewriteEngine on
+RewriteRule ^([0-9a-zA-Z]+)$ shorturl.php?p=$1 [L]

Base10Convert.php

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+<?php
+
+/** Base10Convert
+  * Copyright (C) 2010 Hyacinthe Cartiaux <[email protected]>
+  *
+  * This program is free software: you can redistribute it and/or modify
+  * it under the terms of the GNU Affero General Public License as
+  * published by the Free Software Foundation, either version 3 of the
+  * License, or (at your option) any later version.
+  *
+  * This program is distributed in the hope that it will be useful,
+  * but WITHOUT ANY WARRANTY; without even the implied warranty of
+  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  * GNU Affero General Public License for more details.
+
+  * You should have received a copy of the GNU Affero General Public License
+  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  */
+
+error_reporting(E_ALL);
+
+/**
+ * @brief This class converts a number in base 10 to base n.
+ **/
+class Base10Convert
+{
+
+  private $alphabet;
+  private $reversed_alphabet;
+  private $base;
+
+  /**
+   * @brief Defines base and alphabet used to encode numbers
+   *
+   * @param base Integer, base Defaults to 62.
+   * @param alphabet Array containing characters of the alphabet Defaults to URI unreserved characters (except -~._) in RFC 3985, section 2.3.
+   **/
+  public function __construct($base = "", $alphabet = array())
+  {
+
+    if ($base == "" && count($alphabet) == 0)
+    {
+      //RFC 3986 section 2.3 Unreserved Characters (January 2005)
+      $this->alphabet = array('0','1','2','3','4','5','6','7','8','9',
+			      'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
+			      'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'
+			      /* , '-','_','.','~' */
+			    );
+
+      $this->base = 62;
+    }
+    else if ($base == count($alphabet) && $base >= 2)
+    {
+      $this->alphabet = $alphabet;
+      $this->base     = $base;
+    }
+    else
+    {
+      throw new Exception("Bad parameters");
+    }
+
+    $this->reversed_alphabet = array_flip($this->alphabet);
+
+  }
+
+  /**
+   * @brief Encodes a number from base 10 to the given base
+   *
+   * @param integer Number to encode
+   * @return String containing the encoded number
+   **/
+  public function encode($integer)
+  {
+    if (!is_int($integer))
+      throw new Exception("Paremeter is not an integer");
+    if ($integer == 0)
+      return $this->alphabet[0];
+
+    $encoded_nbr = "";
+
+    while ($integer > 0)
+    {
+      $current_nbr = $integer % $this->base;
+      $integer = (int) ($integer / $this->base);
+      $encoded_nbr = $this->alphabet[$current_nbr] . $encoded_nbr;
+    }
+
+    return $encoded_nbr;
+  }
+
+  /**
+   * @brief Decodes a number from the given base the base 10
+   *
+   * @param encoded_nbr Encoded number 
+   * @return int
+   **/
+  public function decode($encoded_nbr)
+  {
+    $len = strlen($encoded_nbr);
+
+    $decoded_number = 0;
+
+    for ($i = 0 ; $i < $len ; $i++)
+    {
+      $char = substr($encoded_nbr, $i, 1);
+
+      $power = $len - ($i + 1);
+      if (isset($this->reversed_alphabet[$char]))
+      {
+        $decoded_number += $this->reversed_alphabet[$char] * pow($this->base, $power);
+      }
+      else
+      {
+        throw new Exception("Parameter contains a character not in the alphabet");
+      }
+    }
+
+    return $decoded_number;
+  }
+
+}
+
+/* Testing
+
+// $obj = new Base10Convert("2", array('0', '1'));
+
+$obj = new Base10Convert();
+
+$str = $obj->encode(16165);
+echo $str."\n";
+$int = $obj->decode($str);
+echo $int;
+
+*/
+
+?>

README

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+Simple Url Shortener
+Copyright (C) 2010 Hyacinthe Cartiaux <[email protected]>
+GNU AGPL v3
+====================
+
+Simple Url Shortener does only one thing : minimizing url.
+It is a small php script which uses sqlite. 
+It's aim is to be as simple as possible.
+
+===== Install ======
+
+You need : 
+* a HTTP server
+* support for PHP 5 and SQLite
+
+Just uncompress the tarball in a directory, the script will create 
+the database and be operational directly.
+
+== Configuration ==
+
+There is a few vars to edit in shorturl.php.
+$TITLE : name of the page
+$SITE : full path to the script. If you don't want to use url
+rewriting, add the name of the script and the query part, in example
+http://www.0wf.fr/shorturl.php?p=
+$DBFILE : name of the sqlite database file
+
+In order to use url rewriting, with Apache 2, create a .htaccess file
+with these lines :
+
+RewriteEngine on
+RewriteRule ^([0-9a-zA-Z]+)$ shorturl.php?p=$1 [L]
+
+You can rename the script shorturl.php to whatever you 
+want, but think about changing references to the old name in 
+your configuration.