diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/View/Helper/TinySrc.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/View/Helper/TinySrc.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,317 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_View
+ * @subpackage Helper
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+
+/** Zend_View_Helper_HtmlElement */
+require_once 'Zend/View/Helper/HtmlElement.php';
+
+/**
+ * Helper for generating urls and/or image tags for use with tinysrc.net
+ *
+ * tinysrc.net provides an API for generating scaled, browser device-specific 
+ * images. In essence, you pass the API the URL to an image on your own server,
+ * and tinysrc.net then provides the appropriate image based on the device that
+ * accesses it.
+ *
+ * Additionally, tinysrc.net allows you to specify additional configuration via 
+ * the API:
+ *
+ * - image size. You may define this as:
+ *   - explicit size
+ *   - subtractive size (size of screen minus specified number of pixels)
+ *   - percentage size (percentage of screen size))
+ * - image format. This will convert the image to the given format; allowed 
+ *   values are "png" or "jpeg". By default, gif images are converted to png.
+ *
+ * This helper allows you to specify all configuration options, as well as:
+ *
+ * - whether or not to generate the full image tag (or just the URL)
+ * - base url to images (which should include the protocol, server, and 
+ *   optionally port and base path)
+ *
+ * @see        http://tinysrc.net/
+ * @package    Zend_View
+ * @subpackage Helper
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_View_Helper_TinySrc extends Zend_View_Helper_HtmlElement
+{
+    const TINYSRC_BASE = 'http://i.tinysrc.mobi';
+
+    /**
+     * @var string Base URL for images
+     */
+    protected $_baseUrl;
+
+    /**
+     * @var bool Whether or not to create an image tag
+     */
+    protected $_createTagFlag = true;
+
+    /**
+     * @var string Default width and height
+     */
+    protected $_dimensions = '';
+
+    /**
+     * Default options
+     *
+     * Used when determining what options were passed, and needing to merge 
+     * them with default options.
+     * 
+     * @var array
+     */
+    protected $_defaultOptions = array(
+        'base_url'   => null,
+        'format'     => null,
+        'width'      => false,
+        'height'     => false,
+        'create_tag' => true,
+    );
+
+    /**
+     * @var string Default image format to use
+     */
+    protected $_format = '';
+
+    /**
+     * Generate a link or image tag pointing to tinysrc.net
+     * 
+     * @param mixed $image 
+     * @param array $options 
+     * @return void
+     */
+    public function tinySrc($image = null, array $options = array())
+    {
+        if (null === $image) {
+            return $this;
+        }
+
+        $defaultOptions = $this->_defaultOptions;
+        $defaultOptions['create_tag'] = $this->createTag();
+        $options = array_merge($defaultOptions, $options);
+
+        $url = '/' . $this->_mergeBaseUrl($options) . ltrim($image, '/');
+
+        $src = self::TINYSRC_BASE 
+             . $this->_mergeFormat($options) 
+             . $this->_mergeDimensions($options)
+             . $url;
+
+        if (!$options['create_tag']) {
+            return $src;
+        }
+
+        foreach (array_keys($this->_defaultOptions) as $key) {
+            switch ($key) {
+                case 'width':
+                case 'height':
+                    if (!is_int($options[$key]) || !is_numeric($options[$key]) || $options[$key] < 0) {
+                        unset($options[$key]);
+                    }
+                    break;
+                default:
+                    unset($options[$key]);
+                    break;
+            }
+        }
+
+        $options['src'] = $src;
+
+        $tag = '<img' . $this->_htmlAttribs($options) . $this->getClosingBracket();
+        return $tag;
+    }
+
+    /**
+     * Set base URL for images
+     * 
+     * @param  string $url 
+     * @return Zend_View_Helper_TinySrc
+     */
+    public function setBaseUrl($url)
+    {
+        $this->_baseUrl = rtrim($url, '/') . '/';
+        return $this;
+    }
+
+    /**
+     * Get base URL for images
+     *
+     * If none already set, uses the ServerUrl and BaseUrl view helpers to
+     * determine the base URL to images.
+     * 
+     * @return string
+     */
+    public function getBaseUrl()
+    {
+        if (null === $this->_baseUrl) {
+            $this->setBaseUrl($this->view->serverUrl($this->view->baseUrl()));
+        }
+        return $this->_baseUrl;
+    }
+
+    /**
+     * Set default image format
+     *
+     * If set, this will set the default format to use on all images.
+     * 
+     * @param  null|string $format 
+     * @return Zend_View_Helper_TinySrc
+     * @throws Zend_View_Exception
+     */
+    public function setDefaultFormat($format = null)
+    {
+        if (null === $format) {
+            $this->_format = '';
+            return $this;
+        }
+
+        $format = strtolower($format);
+        if (!in_array($format, array('png', 'jpeg'))) {
+            require_once 'Zend/View/Exception.php';
+            throw new Zend_View_Exception('Invalid format; must be one of "jpeg" or "png"');
+        }
+        $this->_format = "/$format";
+        return $this;
+    }
+
+    /**
+     * Set default dimensions
+     *
+     * If null is specified for width, default dimensions will be cleared. If 
+     * only width is specified, only width will be used. If either dimension
+     * fails validation, an exception is raised.
+     * 
+     * @param  null|int|string $width 
+     * @param  null|int|string $height 
+     * @return Zend_View_Helper_TinySrc
+     * @throws Zend_View_Exception
+     */
+    public function setDefaultDimensions($width = null, $height = null)
+    {
+        if (null === $width) {
+            $this->_dimensions = '';
+            return $this;
+        }
+
+        if (!$this->_validateDimension($width)) {
+            require_once 'Zend/View/Exception.php';
+            throw new Zend_View_Exception('Invalid dimension; must be an integer, optionally preceded by "-" or "x"');
+        }
+
+        $this->_dimensions = "/$width";
+        if (null === $height) {
+            return $this;
+        }
+
+        if (!$this->_validateDimension($height)) {
+            require_once 'Zend/View/Exception.php';
+            throw new Zend_View_Exception('Invalid dimension; must be an integer, optionally preceded by "-" or "x"');
+        }
+        $this->_dimensions .= "/$height";
+        return $this;
+    }
+
+    /**
+     * Set state of "create tag" flag
+     * 
+     * @param  bool $flag 
+     * @return Zend_View_Helper_TinySrc
+     */
+    public function setCreateTag($flag)
+    {
+        $this->_createTagFlag = (bool) $flag;
+        return $this;
+    }
+
+    /**
+     * Should the helper create an image tag?
+     * 
+     * @return bool
+     */
+    public function createTag()
+    {
+        return $this->_createTagFlag;
+    }
+
+    /**
+     * Validate a dimension
+     *
+     * Dimensions may be integers, optionally preceded by '-' or 'x'.
+     * 
+     * @param  string $dim 
+     * @return bool
+     */
+    protected function _validateDimension($dim)
+    {
+        if (!is_scalar($dim) || is_bool($dim)) {
+            return false;
+        }
+        return preg_match('/^(-|x)?\d+$/', (string) $dim);
+    }
+
+    /**
+     * Determine whether to use default base URL, or base URL from options
+     * 
+     * @param  array $options 
+     * @return string
+     */
+    protected function _mergeBaseUrl(array $options)
+    {
+        if (null === $options['base_url']) {
+            return $this->getBaseUrl();
+        }
+        return rtrim($options['base_url'], '/') . '/';
+    }
+
+    /**
+     * Determine whether to use default format or format provided in options.
+     * 
+     * @param  array $options 
+     * @return string
+     */
+    protected function _mergeFormat(array $options) 
+    {
+        if (in_array($options['format'], array('png', 'jpeg'))) {
+            return '/' . $options['format'];
+        }
+        return $this->_format;
+    }
+
+    /**
+     * Determine whether to use default dimensions, or those passed in options.
+     * 
+     * @param  array $options 
+     * @return string
+     */
+    protected function _mergeDimensions(array $options)
+    {
+        if (!$this->_validateDimension($options['width'])) {
+            return $this->_dimensions;
+        }
+        $dimensions = '/' . $options['width'];
+        if (!$this->_validateDimension($options['height'])) {
+            return $dimensions;
+        }
+        $dimensions .= '/' . $options['height'];
+        return $dimensions;
+    }
+}