Now all modules are in core modules folder

modules/filefield/views/filefield.views.inc

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+<?php
+/**
+ * @file
+ * Provide views data for filefield.module.
+ */
+
+/**
+ * @defgroup views_filefield_module filefield.module handlers
+ *
+ * Includes the handler for the FileField data column.
+ * @{
+ */
+
+
+/**
+ * Implementation of hook_views_data()
+ */
+function filefield_views_data() {
+  $data = array();
+
+  // Extend the files table with an icon field.
+  $data['files']['icon'] = array(
+    'title' => t('Icon'),
+    'help' => t('An icon corresponding to the file MIME type.'),
+    'real field' => 'filemime',
+    'field' => array(
+      'handler' => 'filefield_handler_field_icon',
+      'click sortable' => FALSE,
+     ),
+  );
+
+  return $data;
+}
+
+/**
+ * Implementation of hook_views_handlers().
+ */
+function filefield_views_handlers() {
+  return array(
+    'info' => array(
+      'path' => drupal_get_path('module', 'filefield') . '/views',
+    ),
+    'handlers' => array(
+      // field handlers
+      'filefield_handler_field_data' => array(
+        'parent' => 'views_handler_field_node',
+      ),
+      'filefield_handler_field_icon' => array(
+        'parent' => 'views_handler_field',
+      ),
+    ),
+  );
+}
+
+/**
+ * @}
+ */

modules/filefield/views/filefield.views_convert.inc

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+<?php
+
+/**
+ * @file
+ * Field conversion for fields handled by this module.
+ */
+
+/**
+ * Implementation of hook_views_convert().
+ */
+function filefield_views_convert($display, $type, &$view, $field, $id = NULL) {
+  static $filefield_fields;
+  static $filefield_filters;
+  static $filefield_arguments;
+  if (!isset($filefield_fields)) {
+    $filefield_fields = $filefield_filters = $filefield_arguments = array();
+    foreach (content_fields() as $content_field) {
+      if ($content_field['module'] == 'filefield') {
+        $result = module_invoke('filefield', 'field_settings', 'views data', $content_field);
+        if (!empty($result)) {
+          foreach ($result as $table => $fields) {
+            unset($fields['table']);
+            foreach ($fields as $filefield_field => $definition) {
+              switch ($filefield_field) {
+                case $content_field['field_name'] .'_fid':
+                  $filefield_fields[$filefield_field] = array(
+                    'table' => $table,
+                    'field' => $filefield_field,
+                  );
+                  $filefield_arguments['content: '. $content_field['field_name']] = &$filefield_fields[$filefield_field];
+                  break;
+                case $content_field['field_name'] .'_list':
+                  $filefield_filters[$content_field['field_name'] .'_fid_not null'] = array(
+                    'table' => $table,
+                    'field' => $filefield_field,
+                  );
+                  break;
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+  switch ($type) {
+    case 'field':
+      if (isset($filefield_fields[$field['field']])) {
+        $multiple = array();
+        switch ($field['handler']) {
+          case 'content_views_field_handler_ungroup':
+            $view->set_item_option($display, 'field', $id, 'multiple', array('group' => FALSE));
+            break;
+          case 'content_views_field_handler_last':
+            $multiple['multiple_reversed'] = TRUE;
+          case 'content_views_field_handler_first':
+            $multiple['multiple_number'] = 1;
+            $view->set_item_option($display, 'field', $id, 'multiple', $multiple);
+            break;
+        }
+        $view->set_item_option($display, 'field', $id, 'format', $field['options']);
+      }
+      break;
+    case 'filter':
+      if (isset($filefield_filters[$field['field']])) {
+        $filter = $filefield_filters[$field['field']];
+        $item = $view->get_item($display, 'filter', $id);
+        $item['value'] = $field['value'];
+        $item['table'] = $filter['table'];
+        $item['field'] = $filter['field'];
+        $view->set_item($display, 'filter', $id, $item);
+      }
+      break;
+    case 'argument':
+      if (isset($filefield_arguments[$field['type']])) {
+        $argument = $filefield_arguments[$field['type']];
+        $options = $field['argoptions'];
+        $view->add_item($display, 'argument', $argument['table'], $argument['field'], $options, $field['id']);
+      }
+      break;
+  }
+}

modules/filefield/views/filefield_handler_field_data.inc

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+<?php
+
+/**
+ * @file
+ * filefield_handler_field_data.inc
+ *
+ * Provides a handler for displaying values within the serialized data column.
+ */
+class filefield_handler_field_data extends views_handler_field_node {
+
+  function option_definition() {
+    $options = parent::option_definition();
+    $options['data_key'] = array('default' => 'description');
+    return $options;
+  }
+
+  function options_form(&$form, &$form_state) {
+    parent::options_form($form, $form_state);
+
+    $options = array();
+    $info = filefield_data_info();
+    foreach ($info as $key => $data) {
+      $options[$key] = $data['title'] . ' (' . $data['module'] .')';
+    }
+
+    $form['data_key'] = array(
+      '#title' => t('Data key'),
+      '#type' => 'radios',
+      '#options' => $options,
+      '#required' => TRUE,
+      '#default_value' => $this->options['data_key'],
+      '#description' => t('The data column may contain only a few or none any of these data options. The name of the module that provides the data is shown in parentheses.'),
+      '#weight' => 4,
+    );
+  }
+
+  function admin_summary() {
+    // Display the data to be displayed.
+    $info = filefield_data_info();
+    return isset($info[$this->options['data_key']]['title']) ? $info[$this->options['data_key']]['title'] : $this->options['data_key'];
+  }
+
+  function render($values) {
+    $values = drupal_clone($values); // Prevent affecting the original.
+    $data = unserialize($values->{$this->field_alias});
+    $values->{$this->field_alias} = filefield_data_value($this->options['data_key'], $data[$this->options['data_key']]);
+
+    // Copied from views_handler_field_node(). We just remove the call to
+    // sanitize_value() from the original call, becaue our value has already
+    // been cleaned by filefield_data_value().
+    return $this->render_link($values->{$this->field_alias}, $values);
+  }
+
+}

modules/filefield/views/filefield_handler_field_icon.inc

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+<?php
+/**
+ * @file
+ * Returns a file icon based on its MIME type.
+ */
+
+class filefield_handler_field_icon extends views_handler_field {
+  function construct() {
+    parent::construct();
+    $this->additional_fields['fid'] = 'fid';
+    $this->additional_fields['filename'] = 'filename';
+    $this->additional_fields['filesize'] = 'filesize';
+  }
+
+  function render($values) {
+    $pseudo_file = array(
+      'fid' => $values->{$this->aliases['fid']},
+      'filemime' => $values->{$this->field_alias},
+      'filename' => $values->{$this->aliases['filename']},
+      'filesize' => $values->{$this->aliases['filesize']},
+    );
+    return theme('filefield_icon', $pseudo_file);
+  }
+}