<?php
//
// ZoneMinder web function library, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
//
require_once('Filter.php');
require_once('FilterTerm.php');

function noCacheHeaders() {
  header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');    // Date in the past
  header('Last-Modified: '.gmdate( 'D, d M Y H:i:s' ).' GMT'); // always modified
  header('Cache-Control: no-store, no-cache, must-revalidate');  // HTTP/1.1
  header('Cache-Control: post-check=0, pre-check=0', false);
  header('Pragma: no-cache');         // HTTP/1.0
}

function CSPHeaders($view, $nonce) {
  global $Servers;

  $additionalScriptSrc = implode(' ', array_map(function($S){return $S->Hostname();}, $Servers));
  switch ($view) {
    case 'login':
      if (defined('ZM_OPT_USE_GOOG_RECAPTCHA')
          && defined('ZM_OPT_GOOG_RECAPTCHA_SITEKEY')
          && defined('ZM_OPT_GOOG_RECAPTCHA_SECRETKEY')
          && ZM_OPT_USE_GOOG_RECAPTCHA && ZM_OPT_GOOG_RECAPTCHA_SITEKEY && ZM_OPT_GOOG_RECAPTCHA_SECRETKEY) {
        $additionalScriptSrc .= ' https://www.google.com';
      }
      // fall through
    default:
      // Enforce script-src on pages where inline scripts and event handlers have been fixed.
      header("Content-Security-Policy: object-src 'self'; worker-src 'self' blob:; script-src 'self' 'nonce-$nonce' $additionalScriptSrc".
        (ZM_CSP_REPORT_URI ? '; report-uri '.ZM_CSP_REPORT_URI : '' )
      );
      break;
  }
}

function CORSHeaders() {
  if (isset($_SERVER['HTTP_ORIGIN'])) {
# The following is left for future reference/use.
    $valid = false;
    global $Servers;
    if (sizeof($Servers) < 1) {
# Only need CORSHeaders in the event that there are multiple servers in use.
      # ICON: Might not be true. multi-port?
      if (ZM_MIN_STREAMING_PORT) {
        ZM\Debug('Setting default Access-Control-Allow-Origin from ' . $_SERVER['HTTP_ORIGIN']);
        header('Access-Control-Allow-Origin: ' . $_SERVER['HTTP_ORIGIN']);
        header('Access-Control-Allow-Credentials: true');
        header('Access-Control-Allow-Headers: x-requested-with,x-request');
      }
      return;
    }
    foreach ($Servers as $Server) {
      if (
        preg_match('/^(https?:\/\/)?'.preg_quote($Server->Hostname(),'/').'/i', $_SERVER['HTTP_ORIGIN'])
        or
        preg_match('/^(https?:\/\/)?'.preg_quote($Server->Name(),'/').'/i', $_SERVER['HTTP_ORIGIN'])
      ) {
        $valid = true;
        ZM\Debug('CORS Setting Access-Control-Allow-Origin from '.$_SERVER['HTTP_ORIGIN']);
        header('Access-Control-Allow-Origin: ' . $_SERVER['HTTP_ORIGIN']);
        header('Access-Control-Allow-Credentials: true');
        header('Access-Control-Allow-Headers: x-requested-with,x-request');

        break;
      }
    }
    if (!$valid) {
      ZM\Warning($_SERVER['HTTP_ORIGIN'] . ' is not found in servers list.');
    }
  } else {
    ZM\Debug('CORS: NO origin');
  }
}

function getMimeType($file) {
  if (function_exists('mime_content_type')) {
    return mime_content_type($file);
  } else if (function_exists('finfo_file')) {
    $finfo = finfo_open(FILEINFO_MIME);
    $mimeType = finfo_file($finfo, $file);
    finfo_close($finfo);
    return $mimeType;
  }
  return trim(exec('file -bi '.escapeshellarg($file).' 2>/dev/null'));
}

function outputVideoStream($id, $src, $width, $height, $format, $title='') {
  echo getVideoStreamHTML($id, $src, $width, $height, $format, $title);
}

function getVideoStreamHTML($id, $src, $width, $height, $format, $title='') {
  $html = '';
  $width = validInt($width);
  $height = validInt($height);
  $title = validHtmlStr($title);

  if ( file_exists($src) ) {
    $mimeType = getMimeType($src);
  } else {
    switch( $format ) {
      case 'asf' :
        $mimeType = 'video/x-ms-asf';
        break;
      case 'avi' :
      case 'wmv' :
        $mimeType = 'video/x-msvideo';
        break;
      case 'mov' :
        $mimeType = 'video/quicktime';
        break;
      case 'mpg' :
      case 'mpeg' :
        $mimeType = 'video/mpeg';
        break;
      case 'swf' :
        $mimeType = 'application/x-shockwave-flash';
        break;
      case '3gp' :
        $mimeType = 'video/3gpp';
        break;
      default :
        $mimeType = 'video/'.$format;
        break;
    }
  }
  if ( !$mimeType || ($mimeType == 'application/octet-stream') )
    $mimeType = 'video/'.$format;

  switch ($mimeType) {
    case 'video/mp4' :
      global $rates, $cspNonce;
      $playbackRates = implode(',',
        array_map(function($r){return $r/100;},
          array_filter(
            array_keys($rates),
            function($r){return $r >= 0 ? true : false;}
          )));
      
      return '<video id="videoobj" class="video-js"
            controls autoplay preload="auto">
          <source src="'. $src.'" type="video/mp4">
          Your browser does not support the video tag.
        </video>
        <script nonce="'.$cspNonce.'">
          document.addEventListener("DOMContentLoaded", function() {
            if (typeof videojs === "undefined") {
              console.error("videojs is not loaded");
              return;
            }
            var player = videojs("videoobj", {
              controls: true,
              autoplay: true,
              preload: "auto",
              fluid: true,
              responsive: true,
              playbackRates: [' . $playbackRates . ']
            });
            player.zoomrotate({
              zoom: 1,
              rotate: 0
            });
          });
        </script>';
    default:
    return '<embed'. ( isset($mimeType)?(' type="'.$mimeType.'"'):'' ). '
      src="'.$src.'"
      name="'.$title.'"
      width="'.$width.'"
      height="'.$height.'"
      autostart="1"
      autoplay="1"
      showcontrols="0"
      controller="0">
      </embed>';
  }
}

function outputImageStream( $id, $src, $width, $height, $title='' ) {
  echo getImageStreamHTML( $id, $src, $width, $height, $title );
}

// width and height MUST be valid and include the px
function getImageStreamHTML( $id, $src, $width, $height, $title='' ) {
  if (canStreamIframe()) {
      return '<iframe id="'.$id.'" src="'.$src.'" alt="'. validHtmlStr($title) .'" '.($width? ' width="'. validInt($width).'"' : '').($height?' height="'.validInt($height).'"' : '' ).'/>';
  } else {
    return getImageStill($id, $src, $width, $height, $title);
  }
}

function outputControlStream($src, $width, $height, $monitor, $scale, $target) {
?>
  <form name="ctrlForm" method="post" action="?" target="<?php echo $target ?>">
    <input type="hidden" name="view" value="blank"/>
    <input type="hidden" name="mid" value="<?php echo $monitor['Id'] ?>"/>
    <input type="hidden" name="action" value="control"/>
    <?php
    if ($monitor['CanMoveMap']) {
    ?>
      <input type="hidden" name="control" value="moveMap"/>
    <?php
    } else if ($monitor['CanMoveRel']) {
    ?>
      <input type="hidden" name="control" value="movePseudoMap"/>
    <?php
    } else if ($monitor['CanMoveCon']) {
    ?>
      <input type="hidden" name="control" value="moveConMap"/>
    <?php
    }
    ?>
    <input type="hidden" name="scale" value="<?php echo $scale ?>"/>
    <input type="image" src="<?php echo $src ?>" width="<?php echo $width ?>" height="<?php echo $height ?>">
  </form>
<?php
}

function outputImageStill($id, $src, $width, $height, $title='') {
  echo getImageStill($id, $src, $width, $height, $title='');
}
function getImageStill($id, $src, $width, $height, $title='') {
      return '<img id="'.$id.'" src="'.$src.'" alt="'. validHtmlStr($title) .'" style="'.
      (($width and ($width !='auto')) ?'width:'.$width.';' : '').
      (($height and ($height != 'auto'))?' height:'.$height.';':'').
      '" />';
}

function getWebSiteUrl($id, $src, $width, $height, $title='') {
  # Prevent unsightly warnings when php cannot verify the ssl certificate
  stream_context_set_default( [
    'ssl' => [
      'verify_peer' => false,
      'verify_peer_name' => false,
    ],
  ]);
  # The End User can turn off the following warning under Options -> Web
  if ( ZM_WEB_XFRAME_WARN ) {
    $header = get_headers($src, 1);
    # If the target website has set X-Frame-Options, check it for "sameorigin" and warn the end user
    if ( array_key_exists('X-Frame-Options', $header) ) {
      $header = $header['X-Frame-Options'];
      if ( stripos($header, 'sameorigin') === 0 )
        ZM\Warning('Web site '.$src.' has X-Frame-Options set to sameorigin. An X-Frame-Options browser plugin is required to display this site.');
    }
  }
  return '<object id="'.$id.'" data="'.$src.'" alt="'.$title.'" width="'.$width.'" height="'.$height.'"></object>';
}

function outputControlStill($src, $width, $height, $monitor, $scale, $target) {
  ?>
  <form name="ctrlForm" method="post" action="?" target="<?php echo $target ?>">
    <input type="hidden" name="view" value="blank"/>
    <input type="hidden" name="mid" value="<?php echo $monitor['Id'] ?>"/>
    <input type="hidden" name="action" value="control"/>
    <?php
    if ( $monitor['CanMoveMap'] ) {
    ?>
    <input type="hidden" name="control" value="moveMap"/>
    <?php
    } else if ( $monitor['CanMoveRel'] ) {
    ?>
    <input type="hidden" name="control" value="movePseudoMap"/>
    <?php
    } else if ( $monitor['CanMoveCon'] ) {
    ?>
    <input type="hidden" name="control" value="moveConMap"/>
    <?php
    }
    ?>
    <input type="hidden" name="scale" value="<?php echo $scale ?>"/>
    <input type="image" src="<?php echo $src ?>" width="<?php echo $width ?>" height="<?php echo $height ?>"/>
  </form>
  <?php
}

// Incoming args are shell-escaped. This function must escape any further arguments it cannot guarantee.
function getZmuCommand($args) {
  $zmuCommand = ZMU_PATH;

  if ( ZM_OPT_USE_AUTH ) {
    global $user;
    // Always include username, so that we can do lookups faster
    $zmuCommand .= ' -U '.escapeshellarg($user->Username());
    if ( ZM_AUTH_RELAY == 'hashed' ) {
      $zmuCommand .= ' -A '.generateAuthHash(false, true);
    } else if ( ZM_AUTH_RELAY == 'plain' ) {
      $zmuCommand .= ' -P '.escapeshellarg($_SESSION['password']);
    }
  }

  $zmuCommand .= $args;

  return $zmuCommand;
}

function getEventDefaultVideoPath($event) {
  $Event = new ZM\Event($event);
  return $Event->getStreamSrc(array('mode'=>'mpeg', 'format'=>'h264'));
}

function deletePath( $path ) {
  ZM\Debug('Deleting '.$path);
  if (is_link($path)) {
    if (!unlink($path)) ZM\Debug("Failed to unlink $path");
  } else if (is_dir($path)) {
    if (false === ($output = system('rm -rf "'.escapeshellcmd($path).'"'))) {
      ZM\Warning('Failed doing rm -rf "'.escapeshellcmd($path).'"');
    }
  } else if (file_exists($path)) {
    if (!unlink($path)) ZM\Debug("Failed to delete $path");
  } else {
    ZM\Warning("Path $path does not exist in deletePath()");
  }
}

function deleteEvent($event) {
  if (empty($event)) {
    ZM\Error('Empty event passed to deleteEvent.');
    return;
  }

  if (gettype($event) != 'array') {
# $event could be an eid, so turn it into an event hash
    $event = new ZM\Event($event);
  }

  if ($event->Archived()) {
    ZM\Info('Cannot delete Archived event.');
    return;
  } # end if Archived

  global $user;

  if ($user->Events() == 'Edit') {
    $event->delete();
  } # CAN EDIT
}

/**
 * $label must be already escaped. It can't be done here since it sometimes contains HTML tags.
 */
function makeLink($url, $label, $condition=1, $options='') {
  $string = '';
  if ($condition) {
    $string .= '<a href="'.$url.'"'.($options?(' '.$options):'').'>';
  }
  $string .= $label;
  if ($condition) {
    $string .= '</a>';
  }
  return $string;
}

//Make it slightly easier to create a link to help text modal
function makeHelpLink($ohndx) {
  return '&nbsp;(<a id="'.$ohndx.'" class="optionhelp">?</a>)';
}

function makeButton($url, $buttonValue, $condition=1, $options='') {
  $string = '<button type="button" data-on-click-this="'.$buttonValue.'"';
  $string .= ' data-url="' .$url. '"';
  if (!$condition) {
    $string .= ' disabled="disabled"';
  }
  $string .= ($options ? (' ' . $options) : '') . '/>'.translate($buttonValue).'</button>'.PHP_EOL;
  return $string;
}

function htmlSelect($name, $contents, $values, $behaviours=false) {
  $behaviourText = '';
  if ( !empty($behaviours) ) {
    if ( is_array($behaviours) ) {
      foreach ( $behaviours as $event=>$action ) {
        $behaviourText .= ' '.$event.'="'.$action.'"';
      }
    } else {
      $behaviourText = ' onchange="'.$behaviours.'"';
    }
  }

  return '<select name="'.$name.'" '.$behaviourText.'>'.PHP_EOL.htmlOptions($contents, $values).'</select>';
}

function htmlOptions($options, $values) {
  $options_html = '';
  $has_selected = false;
  foreach ( $options as $value=>$option ) {
    $disabled = 0;
    $text = '';
    if ( is_array($option) ) {

      if ( isset($option['Name']) )
        $text = $option['Name'];
      else if ( isset($option['text']) )
        $text = $option['text'];

      if ( isset($option['disabled']) ) {
        $disabled = $option['disabled'];
      }
    } else if ( is_object($option) ) {
      $text = $option->Name();
    } else {
      $text = $option;
    }
    $selected = false;
    if ($values !== null) {
      $selected = is_array($values) ? in_array($value, $values) : (!strcmp($value, $values));
      if ( !$has_selected ) 
        $has_selected = $selected;
    }

    $options_html .= '<option value="'.htmlspecialchars($value, ENT_COMPAT | ENT_HTML401, ini_get('default_charset'), false).'"'.
      ($selected?' selected="selected"':'').
      ($disabled?' disabled="disabled"':'').
      '>'.htmlspecialchars($text, ENT_COMPAT | ENT_HTML401, ini_get('default_charset'), false).'</option>'.PHP_EOL;
  } # end foreach options
  if ( $values and ((!is_array($values)) or count($values) ) and ! $has_selected ) {
    $backTrace = debug_backtrace();
    ZM\Warning('Specified value '.print_r($values, true).' not in contents: '.print_r($options, true). ' from ' . print_r($backTrace, true));
  }
  return $options_html;
} # end function htmlOptions

function truncText($text, $length, $deslash=1) {
  return preg_replace('/^(.{'.$length.',}?)\b.*$/', '\\1&hellip;', ($deslash?stripslashes($text):$text));
}

function buildSelect($name, $contents, $behaviours=false) {
  $value = '';
  if ( preg_match('/^\s*(\w+)\s*(\[.*\])?\s*$/', $name, $matches) && (count($matches) > 2) ) {
    $arr = $matches[1];
    if ( isset($GLOBALS[$arr]) )
      $value = $GLOBALS[$arr];
    elseif ( isset($_REQUEST[$arr]) )
      $value = $_REQUEST[$arr];
    if ( !preg_match_all('/\[\s*[\'"]?(\w+)["\']?\s*\]/', $matches[2], $matches) ) {
      ZM\Fatal("Can't parse selector '$name'");
    }
    for ( $i = 0; $i < count($matches[1]); $i++ ) {
      $idx = $matches[1][$i];
      $value = isset($value[$idx])?$value[$idx]:false;
    }
  } else {
    if ( isset($GLOBALS[$name]) )
      $value = $GLOBALS[$name];
    elseif ( isset($_REQUEST[$name]) )
      $value = $_REQUEST[$name];
  }
  ob_start();
  $behaviourText = '';
  if ( !empty($behaviours) ) {
    if ( is_array($behaviours) ) {
      foreach ( $behaviours as $event=>$action ) {
        $behaviourText .= ' '.$event.'="'.$action.'"';
      }
    } else {
      $behaviourText = ' data-on-change-this="'.$behaviours.'"';
    }
  }
  ?>
  <select name="<?php echo $name ?>" id="<?php echo $name ?>"<?php echo $behaviourText ?>>
  <?php
  foreach ( $contents as $contentValue => $contentText ) {
  ?>
    <option value="<?php echo $contentValue ?>"<?php if ( $value == $contentValue ) { ?> selected="selected"<?php } ?>><?php echo validHtmlStr($contentText) ?></option>
  <?php
  }
  ?>
  </select>
  <?php
  $html = ob_get_contents();
  ob_end_clean();

  return $html;
}

function getFormChanges($values, $newValues, $types=false, $columns=false) {
  $changes = array();
  if ( !$types )
    $types = array();

  foreach ( $newValues as $key=>$value ) {
    if ( $columns && !isset($columns[$key]) )
      continue;

    if ( !isset($types[$key]) )
      $types[$key] = false;

    switch ( $types[$key] ) {
      case 'set' :
          if ( is_array($newValues[$key]) ) {
            if ( (!isset($values[$key])) or ( join(',',$newValues[$key]) != $values[$key] ) ) {
              $changes[$key] = "`$key` = ".dbEscape(join(',',$newValues[$key]));
            }
          } else if ( (!isset($values[$key])) or $values[$key] ) {
            $changes[$key] = "`$key` = ''";
          }
          break;
      case 'image' :
          if ( is_array( $newValues[$key] ) ) {
            $imageData = getimagesize( $newValues[$key]['tmp_name'] );
            $changes[$key.'Width'] = $key.'Width = '.$imageData[0];
            $changes[$key.'Height'] = $key.'Height = '.$imageData[1];
            $changes[$key.'Type'] = $key.'Type = \''.$newValues[$key]['type'].'\'';
            $changes[$key.'Size'] = $key.'Size = '.$newValues[$key]['size'];
            ob_start();
            readfile( $newValues[$key]['tmp_name'] );
            $changes[$key] = $key." = ".dbEscape( ob_get_contents() );
            ob_end_clean();
          } else {
            $changes[$key] = "$key = ".dbEscape($value);
          }
          break;
      case 'document' :
          if ( is_array( $newValues[$key] ) ) {
            $imageData = getimagesize( $newValues[$key]['tmp_name'] );
            $changes[$key.'Type'] = $key.'Type = \''.$newValues[$key]['type'].'\'';
            $changes[$key.'Size'] = $key.'Size = '.$newValues[$key]['size'];
            ob_start();
            readfile( $newValues[$key]['tmp_name'] );
            $changes[$key] = $key.' = '.dbEscape( ob_get_contents() );
            ob_end_clean();
          } else {
            $changes[$key] = $key . ' = '.dbEscape($value);
          }
          break;
      case 'file' :
          $changes[$key.'Type'] = $key.'Type = '.dbEscape($newValues[$key]['type']);
          $changes[$key.'Size'] = $key.'Size = '.dbEscape($newValues[$key]['size']);
          ob_start();
          readfile( $newValues[$key]['tmp_name'] );
          $changes[$key] = $key.' = \''.dbEscape( ob_get_contents() ).'\'';
          ob_end_clean();
          break;
      case 'raw' :
          if ( (!isset($values[$key])) or ($values[$key] != $value) ) {
            $changes[$key] = $key . ' = '.dbEscape($value);
          }
          break;
      case 'toggle' :
        if ( (!isset($values[$key])) or $values[$key] != $value ) {
          if ( empty($value) ) {
            $changes[$key] = $key.' = 0';
          } else {
            $changes[$key] = $key.' = 1';
            //$changes[$key] = $key . ' = '.dbEscape(trim($value));
          }
        }
        break;
      case 'integer' :
        if ( (!isset($values[$key])) or $values[$key] != $value ) {
          $changes[$key] = $key . ' = '.intval($value);
        }
        break;
      default :
          if ( !isset($values[$key]) || ($values[$key] != $value) ) {
            if ( ! isset($value) || $value == '' ) {
              $changes[$key] = "`$key` = NULL";
            } else {
              $changes[$key] = "`$key` = ".dbEscape(trim($value));
            }
          }
          break;
    } // end switch
  } // end foreach newvalues

  foreach ( $values as $key=>$value ) {
    if ( !empty($columns[$key]) ) {
      if ( !empty($types[$key]) ) {
        if ( $types[$key] == 'toggle' ) {
          if ( !isset($newValues[$key]) && !empty($value) ) {
            $changes[$key] = "`$key` = 0";
          }
        } else if ( $types[$key] == 'set' ) {
          $changes[$key] = "`$key` = ''";
        }
      }
    }
  }
  return $changes;
}

function getBrowser(&$browser, &$version) {
  if ( isset($_SESSION['browser']) ) {
    $browser = $_SESSION['browser'];
    $version = $_SESSION['version'];
  } else {
    if (
      ( preg_match('/MSIE (.*?);/', $_SERVER['HTTP_USER_AGENT'], $logVersion))
      ||
      ( preg_match('/.*Trident.*rv:(.*?)(;|\))/', $_SERVER['HTTP_USER_AGENT'], $logVersion))
    ) {
      $version = $logVersion[1];
      $browser = 'ie';
    } else if ( preg_match('/Chrome\/([0-9]+)/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      // We only care about the major so don't count .
      $version = $logVersion[1];
      // Check for old version of Chrome with bug 5876
      if ( $version < 7 ) {
        $browser = 'oldchrome';
      } else {
        $browser = 'chrome';
      }
    } else if ( preg_match('/Safari\/([0-9.]+)/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'safari';
    } else if ( preg_match('/Opera[ \/]([0-9].[0-9]{1,2})/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'opera';
    } else if ( preg_match('/Konqueror\/([0-9.]+)/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'konqueror';
    } else if ( preg_match('/Mozilla\/([0-9].[0-9]{1,2})/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'mozilla';
    } else {
      $version = 0;
      $browser = 'unknown';
    }
    $_SESSION['browser'] = $browser;
    $_SESSION['version'] = $version;
  }
}

function isMozilla() {
  getBrowser($browser, $version);

  return $browser == 'mozilla';
}

function isKonqueror() {
  getBrowser($browser, $version);

  return $browser == 'konqueror';
}

function isInternetExplorer() {
  getBrowser($browser, $version);

  return $browser == 'ie';
}

function isOldChrome() {
  getBrowser($browser, $version);

  return $browser == 'oldchrome';
}

function isChrome() {
  getBrowser($browser, $version);

  return $browser == 'chrome';
}

function isOpera() {
  getBrowser($browser, $version);

  return $browser == 'opera';
}

function isSafari() {
  getBrowser($browser, $version);

  return $browser == 'safari';
}

function isWindows() {
  return preg_match('/Win/', $_SERVER['HTTP_USER_AGENT']);
}

function canStreamIframe() {
  return isKonqueror();
}

function canStreamNative() {
  // Old versions of Chrome can display the stream, but then it blocks everything else (Chrome bug 5876)
  return ( ZM_WEB_CAN_STREAM == 'yes' || ( ZM_WEB_CAN_STREAM == 'auto' && (!isInternetExplorer() && !isOldChrome()) ) );
}

function canStream() {
  return canStreamNative();
}

function packageControl($command) {
  $string = ZM_PATH_BIN.'/zmpkg.pl '.escapeshellarg($command);
  $string .= ' 2>/dev/null >&- <&- >/dev/null';
  exec($string);
}

function daemonControl($command, $daemon=false, $args=false) {
  $string = escapeshellcmd(ZM_PATH_BIN).'/zmdc.pl '.$command;
  if ( $daemon ) {
    $string .= ' ' . $daemon;
    if ( $args ) {
      $string .= ' ' . $args;
    }
  }
  $string = escapeshellcmd($string);
  #$string .= ' 2>/dev/null >&- <&- >/dev/null';
  ZM\Debug('daemonControl '.$string);
  exec($string);
}

function zmcControl($monitor, $mode=false) {
  $Monitor = new ZM\Monitor($monitor);
  return $Monitor->zmcControl($mode);
}

function initDaemonStatus() {
  global $daemon_status;

  if ( !isset($daemon_status) ) {
    if ( daemonCheck() ) {
      $string = ZM_PATH_BIN.'/zmdc.pl status';
      $daemon_status = shell_exec($string);
    } else {
      $daemon_status = '';
    }
  }
}

function daemonStatus($daemon, $args=false) {
  global $daemon_status;

  initDaemonStatus();

  $string = $daemon;
  if ( $args ) {
		if ( is_array($args) ) {
			$string .= join(' ', $args);
		} else {
			$string .= ' ' . $args;
		}
	}
  return ( strpos($daemon_status, "'$string' running") !== false );
}

function zmcStatus($monitor) {
  if ( $monitor['Type'] == 'Local' ) {
    $zmcArgs = '-d '.$monitor['Device'];
  } else {
    $zmcArgs = '-m '.$monitor['Id'];
  }
  return daemonStatus('zmc', $zmcArgs);
}

function daemonCheck($daemon=false, $args=false) {
  $string = ZM_PATH_BIN.'/zmdc.pl check';
  if ( $daemon ) {
    $string .= ' ' . $daemon;
    if ( $args )
      $string .= ' '. $args;
  }
  $string = escapeshellcmd($string);
  $result = exec($string);
  return preg_match('/running/', $result);
}

function zmcCheck($monitor) {
  if ( $monitor['Type'] == 'Local' ) {
    $zmcArgs = '-d '.$monitor['Device'];
  } else {
    $zmcArgs = '-m '.$monitor['Id'];
  }
  return daemonCheck('zmc', $zmcArgs);
}

function getImageSrc($event, $frame, $scale=SCALE_BASE, $captureOnly=false, $overwrite=false) {
  $Event = new ZM\Event($event);
  return $Event->getImageSrc($frame, $scale, $captureOnly, $overwrite);
}

function viewImagePath($path, $querySep='&amp;') {
  return '?view=image'.$querySep.'path='.$path;
}

function createListThumbnail($event, $overwrite=false) {
  # Load the frame with the highest score to use as a thumbnail
  if ( !($frame = dbFetchOne('SELECT * FROM Frames WHERE EventId=? AND Score=? ORDER BY FrameId LIMIT 1', NULL, array($event['Id'], $event['MaxScore']) )) )
    return false;

  $frameId = $frame['FrameId'];

  if ( ZM_WEB_LIST_THUMB_WIDTH ) {
    $thumbWidth = ZM_WEB_LIST_THUMB_WIDTH;
    $scale = (SCALE_BASE*ZM_WEB_LIST_THUMB_WIDTH)/$event['Width'];
    $thumbHeight = reScale($event['Height'], $scale);
  } elseif ( ZM_WEB_LIST_THUMB_HEIGHT ) {
    $thumbHeight = ZM_WEB_LIST_THUMB_HEIGHT;
    $scale = (SCALE_BASE*ZM_WEB_LIST_THUMB_HEIGHT)/$event['Height'];
    $thumbWidth = reScale($event['Width'], $scale);
  } else {
    ZM\Fatal('No thumbnail width or height specified, please check in Options->Web');
  }

  $imageData = getImageSrc($event, $frame, $scale, false, $overwrite);
  if ( !$imageData ) {
    return false;
  }

  $thumbData = $frame;
  $thumbData['Path'] = $imageData['thumbPath'];
  $thumbData['Width'] = (int)$thumbWidth;
  $thumbData['Height'] = (int)$thumbHeight;

  return $thumbData;
}

# This takes more than one scale amount, so it runs through each and alters dimension.
# I can't imagine why you would want to do that.
function reScale($dimension, $dummy) {
  $new_dimension = $dimension;
  for ( $i = 1; $i < func_num_args(); $i++ ) {
    $scale = func_get_arg($i);
    if ( !empty($scale) && ($scale != '0') && ($scale != 'auto') && ($scale != 'fixed') && ($scale != SCALE_BASE) )
      $new_dimension = (int)(($new_dimension*$scale)/SCALE_BASE);
  }
  return $new_dimension;
}

function deScale($dimension, $dummy) {
  $new_dimension = $dimension;
  for ( $i = 1; $i < func_num_args(); $i++ ) {
    $scale = func_get_arg($i);
    if ( !empty($scale) && $scale != SCALE_BASE )
      $new_dimension = (int)(($new_dimension*SCALE_BASE)/$scale);
  }
  return $new_dimension;
}

function monitorLimitSql() {
  global $user;
  if ( count($user->unviewableMonitorIds()) )
    $midSql = ' AND MonitorId IN ('.join(',', $user->viewableMonitorIds()).')';
  else
    $midSql = '';
  return $midSql;
}

function parseSort($saveToSession=false, $querySep='&amp;') {
  global $sortQuery, $sortColumn, $sortOrder, $limitQuery; // Outputs
  if ( isset($_REQUEST['filter']['Query']['sort_field']) ) { //Handle both new and legacy filter passing
    $_REQUEST['sort_field'] = $_REQUEST['filter']['Query']['sort_field'];
  }
  if ( isset($_REQUEST['filter']['Query']['sort_asc']) ) {
    $_REQUEST['sort_asc'] = $_REQUEST['filter']['Query']['sort_asc'];
  }
  if ( isset($_REQUEST['filter']['Query']['limit']) ) {
    $_REQUEST['limit'] = $_REQUEST['filter']['Query']['limit'];
  }
  if ( empty($_REQUEST['sort_field']) ) {
    $_REQUEST['sort_field'] = ZM_WEB_EVENT_SORT_FIELD;
    $_REQUEST['sort_asc'] = (ZM_WEB_EVENT_SORT_ORDER == 'asc');
  }
  switch( $_REQUEST['sort_field'] ) {
    case 'Id' :
      $sortColumn = 'E.Id';
      break;
    case 'MonitorName' :
      $sortColumn = 'M.Name';
      break;
    case 'Name' :
      $sortColumn = 'E.Name';
      break;
    case 'Cause' :
      $sortColumn = 'E.Cause';
      break;
    case 'DateTime' :
      $sortColumn = 'E.StartDateTime';
      $_REQUEST['sort_field'] = 'StartDateTime';
      break;
    case 'DiskSpace' :
      $sortColumn = 'E.DiskSpace';
      break;
    case 'StartTime' :
      # legacy
      $_REQUEST['sort_field'] = 'StartDateTime';
      $sortColumn = 'E.StartDateTime';
      break;
    case 'StartDateTime' :
      $sortColumn = 'E.StartDateTime';
      break;
    case 'EndTime' :
      #legacy
      $_REQUEST['sort_field'] = 'EndDateTime';
      $sortColumn = 'E.EndDateTime';
      break;
    case 'EndDateTime' :
      $sortColumn = 'E.EndDateTime';
      break;
    case 'Length' :
      $sortColumn = 'E.Length';
      break;
    case 'Frames' :
      $sortColumn = 'E.Frames';
      break;
    case 'AlarmFrames' :
      $sortColumn = 'E.AlarmFrames';
      break;
    case 'TotScore' :
      $sortColumn = 'E.TotScore';
      break;
    case 'AvgScore' :
      $sortColumn = 'E.AvgScore';
      break;
    case 'MaxScore' :
      $sortColumn = 'E.MaxScore';
      break;
    case 'FramesFrameId' :
      $sortColumn = 'F.FrameId';
      break;
    case 'FramesType' :
      $sortColumn = 'F.Type';
      break;
    case 'FramesTimeStamp' :
      $sortColumn = 'F.TimeStamp';
      break;
    case 'FramesDelta' :
      $sortColumn = 'F.Delta';
      break;
    case 'FramesScore' :
      $sortColumn = 'F.Score';
      break;
    case 'Notes' :
      $sortColumn = 'E.Notes';
      break;
    default:
      ZM\Warning("Unsupported sort field ".$_REQUEST['sort_field']);
      $sortColumn = 'E.StartDateTime';
      break;
  }
  if ( !isset($_REQUEST['sort_asc']) )
    $_REQUEST['sort_asc'] = 0;
  $sortOrder = $_REQUEST['sort_asc'] ? 'asc' : 'desc';
  $sortQuery = $querySep.'sort_field='.validHtmlStr($_REQUEST['sort_field']).$querySep.'sort_asc='.validHtmlStr($_REQUEST['sort_asc']);
  if ( !isset($_REQUEST['limit']) )
    $_REQUEST['limit'] = '';
  if ( $saveToSession ) {
    $_SESSION['sort_field'] = validHtmlStr($_REQUEST['sort_field']);
    $_SESSION['sort_asc'] = validHtmlStr($_REQUEST['sort_asc']);
  }
  if ($_REQUEST['limit'] != '') {
    $limitQuery = '&limit='.validInt($_REQUEST['limit']);
  }
}

# Historically this function has just modified the passed in filter array.
# This would normally be $_REQUEST['filter'];  We don't like modifying 
# request parameters. For now we will keep this behaviour, but note that we 
# now return the resulting array and other code should by modified to use that.
#
# Please note that I will be removing the savetosession code as well.
function parseFilter(&$filter, $saveToSession=false, $querySep='&amp;') {

  $Filter = ZM\Filter::parse($filter, $querySep);

  if (isset($filter['Id']))
    $filter['Id'] = validCardinal($filter['Id']);
  $filter['sql'] = $Filter->sql();
  $filter['querystring'] = $Filter->querystring('filter', $querySep);
  $filter['hidden_fields'] = $Filter->hidden_fields();
  $filter['pre_sql_conditions'] = $Filter->pre_sql_conditions();
  $filter['post_sql_conditions'] = $Filter->post_sql_conditions();

  if ( $filter['sql'] )
    $filter['sql'] = ' AND ( '.$filter['sql'].' )';

  #if ( 0 ) {
    #// ICON I feel like these should be here, but not yet
  #if ( isset($filter['Query']['sort_field']) ) {
    #$filter['sql'] .= ' ORDER BY ' . $filter['Query']['sort_field'] . (
      #( $filter['Query']['sort_asc'] ? ' ASC' : ' DESC' ) );
  #}
  #}
  return $filter;
} // end function parseFilter(&$filter, $saveToSession=false, $querySep='&amp;')

// Please note that the filter is passed in by copy, so you need to use the return value from this function.
//
function addFilterTerm($filter, $position, $term=false) {
  if ( $position < 0 )
    $position = 0;

  if ( !isset($filter['Query']['terms']) )
    $filter['Query']['terms'] = array();
  else if ( $position > count($filter['Query']['terms']) )
    $position = count($filter['Query']['terms']);

  if ( $term && $position == 0 )
    unset($term['cnj']);
  array_splice($filter['Query']['terms'], $position, 0, array($term ? $term : array()));

  return $filter;
}

function delFilterTerm($filter, $position) {
  if ( $position < 0 )
    $position = 0;
  else if ( $position >= count($filter['Query']['terms']) )
    $position = count($filter['Query']['terms']);
  array_splice($filter['Query']['terms'], $position, 1);

  return $filter;
}

function getPagination($pages, $page, $maxShortcuts, $query, $querySep='&amp;') {
  global $view;

  $pageText = '';
  if ( $pages > 1 ) {
    if ( $page ) {
      if ( $page < 0 )
        $page = 1;
      if ( $page > $pages )
        $page = $pages;

      if ( $page > 1 ) {
        if ( false && $page > 2 ) {
          $pageText .= '<a href="?view='.$view.$querySep.'page=1'.$query.'">&lt;&lt;</a>';
        }
        $pageText .= '<a href="?view='.$view.$querySep.'page='.($page-1).$query.'">&lt;</a>';

        $newPages = array();
        $pagesUsed = array();
        $lo_exp = max(2,log($page-1)/log($maxShortcuts));
        for ( $i = 0; $i < $maxShortcuts; $i++ ) {
          $newPage = round($page-pow($lo_exp,$i));
          if ( isset($pagesUsed[$newPage]) )
            continue;
          if ( $newPage <= 1 )
            break;
          $pagesUsed[$newPage] = true;
          array_unshift($newPages, $newPage);
        }
        if ( !isset($pagesUsed[1]) )
          array_unshift( $newPages, 1 );

        foreach ( $newPages as $newPage ) {
          $pageText .= '<a href="?view='.$view.$querySep.'page='.$newPage.$query.'">'.$newPage.'</a>&nbsp;';
        }
      } # end if page > 1

      $pageText .= '-&nbsp;'.$page.'&nbsp;-';
      if ( $page < $pages ) {
        $newPages = array();
        $pagesUsed = array();
        $hi_exp = max(2,log($pages-$page)/log($maxShortcuts));
        for ( $i = 0; $i < $maxShortcuts; $i++ ) {
          $newPage = round($page+pow($hi_exp,$i));
          if ( isset($pagesUsed[$newPage]) )
            continue;
          if ( $newPage > $pages )
            break;
          $pagesUsed[$newPage] = true;
          array_push($newPages, $newPage);
        }
        if ( !isset($pagesUsed[$pages]) )
          array_push($newPages, $pages);

        foreach ( $newPages as $newPage ) {
          $pageText .= '&nbsp;<a href="?view='.$view.$querySep.'page='.$newPage.$query.'">'.$newPage.'</a>';
        }
        $pageText .= '<a href="?view='.$view.$querySep.'page='.($page+1).$query.'">&gt;</a>';
        if ( false && $page < ($pages-1) ) {
          $pageText .= '<a href="?view='.$view.$querySep.'page='.$pages.$query.'">&gt;&gt;</a>';
        }
      } # end if $page < $pages
    }
  }
  return $pageText;
}

function sortHeader($field, $querySep='&amp;') {
  global $view;
  return implode($querySep, array(
    '?view='.$view,
    'page=1'.((isset($_REQUEST['filter']) and isset($_REQUEST['filter']['query'])) ? $_REQUEST['filter']['query'] : ''),
    'sort_field='.$field,
    'sort_asc='.( ( isset($_REQUEST['sort_field']) and ( $_REQUEST['sort_field'] == $field ) ) ? !validInt($_REQUEST['sort_asc']) : 0),
    'limit='.(isset($_REQUEST['limit']) ? validInt($_REQUEST['limit']) : ''),
    (isset($_REQUEST['eid']) ? 'eid='.validCardinal($_REQUEST['eid']) : '' ),
  ));
}

function sortTag($field) {
  if ( isset($_REQUEST['sort_field']) ) {
    if ( $_REQUEST['sort_field'] == $field )
      if ( $_REQUEST['sort_asc'] )
        return '(^)';
      else
        return '(v)';
  }
  return false;
}

function getLoad() {
  $load = sys_getloadavg();
  return $load[0];
}

function getDiskPercent($path = ZM_DIR_EVENTS) {
  $total = disk_total_space($path);
  if ( $total === false ) {
    ZM\Error('disk_total_space returned false. Verify the web account user has access to ' . $path);
    return 0;
  } elseif ( $total == 0 ) {
    ZM\Error('disk_total_space indicates the following path has a filesystem size of zero bytes ' . $path);
    return 100;
  }
  $free = disk_free_space($path);
  if ( $free === false ) {
    ZM\Error('disk_free_space returned false. Verify the web account user has access to ' . $path);
  }
  $space = round((($total - $free) / $total) * 100);
  return $space;
}

function getDiskBlocks($path = ZM_DIR_EVENTS) {
  $df = shell_exec('df '.escapeshellarg($path));
  $space = -1;
  if ( preg_match('/\s(\d+)\s+\d+\s+\d+%/ms', $df, $matches) )
    $space = $matches[1];
  return $space;
}

function systemStats() {
  $load = getLoad();
  $diskPercent = getDiskPercent();
  $pathMapPercent = getDiskPercent(ZM_PATH_MAP);
  $cpus = getcpus();

  $normalized_load = $load / $cpus;

  # Colorize the system load stat
  if ( $normalized_load <= 0.75 ) {
    $htmlLoad = $load;
  } else if ( $normalized_load <= 0.9 ) {
    $htmlLoad = '<span class="warning">'.$load.'</span>';
  } else if ( $normalized_load <= 1.1 ) {
    $htmlLoad = '<span class="error">'.$load.'</span>';
  } else {
    $htmlLoad = '<span class="critical">'.$load.'</span>';
  }

  # Colorize the disk space stat
  if ( $diskPercent < 98 ) {
    $htmlDiskPercent = $diskPercent.'%';
  } else if ( $diskPercent <= 99 ) {
    $htmlDiskPercent = '<span class="warning">'.$diskPercent.'%</span>';
  } else {
    $htmlDiskPercent = '<span class="error">'.$diskPercent.'%</span>';
  }

  # Colorize the PATH_MAP (usually /dev/shm) stat
  if ( $pathMapPercent < 90 ) {
    if ( disk_free_space(ZM_PATH_MAP) > 209715200 ) { # have to always have at least 200MiB free
      $htmlPathMapPercent = $pathMapPercent.'%';
    } else {
      $htmlPathMapPercent = '<span class="warning">'.$pathMapPercent.'%</span>';
    }
  } else if ( $pathMapPercent < 100 ) {
    $htmlPathMapPercent = '<span class="warning">'.$pathMapPercent.'%</span>';
  } else {
    $htmlPathMapPercent = '<span class="critical">'.$pathMapPercent.'%</span>';
  }

  $htmlString = translate('Load').': '.$htmlLoad.' - '.translate('Disk').': '.$htmlDiskPercent.' - '.ZM_PATH_MAP.': '.$htmlPathMapPercent;

  return $htmlString;
}

function getcpus() {
  if ( is_readable('/proc/cpuinfo') ) { # Works on Linux
    preg_match_all('/^processor/m', file_get_contents('/proc/cpuinfo'), $matches);
    $num_cpus = count($matches[0]);
  } else { # Works on BSD
    $matches = explode(':', shell_exec('sysctl hw.ncpu'));
    $num_cpus = trim($matches[1]);
  }

  return $num_cpus;
}

// Function to fix a problem whereby the built in PHP session handling
// features want to put the sid as a hidden field after the form or
// fieldset tag, neither of which will work with strict XHTML Basic.
function sidField() {
  if ( SID ) {
    list($sessname, $sessid) = explode('=', SID);
?>
    <input type="hidden" name="<?php echo $sessname ?>" value="<?php echo $sessid ?>"/>
<?php
  }
}

function verNum($version) {
  $vNum = '';
  $maxFields = 3;
  $vFields = explode('.', $version);
  array_splice($vFields, $maxFields);
  while ( count($vFields) < $maxFields ) {
    $vFields[] = 0;
  }
  foreach ( $vFields as $vField ) {
    $vField = sprintf('%02d', $vField);
    while ( strlen($vField) < 2 ) {
      $vField = '0'.$vField;
    }
    $vNum .= $vField;
  }
  return $vNum;
}

function fixSequences() {
  $sequence = 1;
  $sql = 'SELECT * FROM Monitors ORDER BY Sequence ASC, Id ASC';
  foreach (dbFetchAll($sql) as $monitor) {
    if ($monitor['Sequence'] != $sequence) {
      dbQuery('UPDATE Monitors SET Sequence=? WHERE Id=?', array($sequence, $monitor['Id']));
    }
    $sequence++;
  }
}

function firstSet() {
  foreach (func_get_args() as $arg) {
    if (!empty($arg))
      return $arg;
  }
}

function linesIntersect($line1, $line2) {
  global $debug;

  $min_x1 = min($line1[0]['x'], $line1[1]['x']);
  $max_x1 = max($line1[0]['x'], $line1[1]['x']);
  $min_x2 = min($line2[0]['x'], $line2[1]['x']);
  $max_x2 = max($line2[0]['x'], $line2[1]['x']);
  $min_y1 = min($line1[0]['y'], $line1[1]['y']);
  $max_y1 = max($line1[0]['y'], $line1[1]['y']);
  $min_y2 = min($line2[0]['y'], $line2[1]['y']);
  $max_y2 = max($line2[0]['y'], $line2[1]['y']);

  // Checking if bounding boxes intersect
  if ( $max_x1 < $min_x2 || $max_x2 < $min_x1 ||$max_y1 < $min_y2 || $max_y2 < $min_y1 ) {
    if ( $debug ) echo 'Not intersecting, out of bounds<br>';
    return false;
  }

  $dx1 = $line1[1]['x'] - $line1[0]['x'];
  $dy1 = $line1[1]['y'] - $line1[0]['y'];
  $dx2 = $line2[1]['x'] - $line2[0]['x'];
  $dy2 = $line2[1]['y'] - $line2[0]['y'];

  if ( $dx1 ) {
    $m1 = $dy1/$dx1;
    $b1 = $line1[0]['y'] - ($m1 * $line1[0]['x']);
  } else {
    $b1 = $line1[0]['y'];
  }
  if ( $dx2 ) {
    $m2 = $dy2/$dx2;
    $b2 = $line2[0]['y'] - ($m2 * $line2[0]['x']);
  } else {
    $b2 = $line2[0]['y'];
  }

  if ( $dx1 && $dx2 ) { // Both not vertical
    if ( $m1 != $m2 ) { // Not parallel or colinear
      $x = ( $b2 - $b1 ) / ( $m1 - $m2 );

      if ( $x >= $min_x1 && $x <= $max_x1 && $x >= $min_x2 && $x <= $max_x2 ) {
        if ( $debug ) echo "Intersecting, at x $x<br>";
        return true;
      } else {
        if ( $debug ) echo "Not intersecting, out of range at x $x<br>";
        return false;
      }
    } elseif ( $b1 == $b2 ) {
      // Colinear, must overlap due to box check, intersect?
      if ( $debug ) echo 'Intersecting, colinear<br>';
      return true;
    } else {
      // Parallel
      if ( $debug ) echo 'Not intersecting, parallel<br>';
      return false;
    }
  } elseif ( !$dx1 ) { // Line 1 is vertical
    $y = ( $m2 * $line1[0]['x'] ) * $b2;
    if ( $y >= $min_y1 && $y <= $max_y1 ) {
      if ( $debug ) echo "Intersecting, at y $y<br>";
      return true;
    } else {
      if ( $debug ) echo "Not intersecting, out of range at y $y<br>";
      return false;
    }
  } elseif ( !$dx2 ) { // Line 2 is vertical
    $y = ( $m1 * $line2[0]['x'] ) * $b1;
    if ( $y >= $min_y2 && $y <= $max_y2 ) {
      if ( $debug ) echo "Intersecting, at y $y<br>";
      return true;
    } else {
      if ( $debug ) echo "Not intersecting, out of range at y $y<br>";
      return false;
    }
  } else { // Both lines are vertical
    if ( $line1[0]['x'] == $line2[0]['x'] ) {
      // Colinear, must overlap due to box check, intersect?
      if ( $debug ) echo 'Intersecting, vertical, colinear<br>';
      return true;
    } else {
      // Parallel
      if ( $debug ) echo 'Not intersecting, vertical, parallel<br>';
      return false;
    }
  }
  if ( $debug ) echo 'Whoops, unexpected scenario<br>';
  return false;
}

function isSelfIntersecting($points) {
  global $debug;

  $n_coords = count($points);
  $edges = array();
  for ( $j = 0, $i = $n_coords-1; $j < $n_coords; $i = $j++ ) {
    $edges[] = array( $points[$i], $points[$j] );
  }

  for ( $i = 0; $i <= ($n_coords-2); $i++ ) {
    for ( $j = $i+2; $j < $n_coords+min(0,$i-1); $j++ ) {
      if ( $debug ) echo "Checking $i and $j<br>";
      if ( linesIntersect($edges[$i], $edges[$j]) ) {
        if ( $debug ) echo "Lines $i and $j intersect<br>";
        return true;
      }
    }
  }
  return false;
}

function getPolyCentre($points, $area=0) {
  $cx = 0.0;
  $cy = 0.0;
  if ( !$area )
    $area = getPolyArea($points);
  for ( $i = 0, $j = count($points)-1; $i < count($points); $j = $i++ ) {
    $ct = ($points[$i]['x'] * $points[$j]['y']) - ($points[$j]['x'] * $points[$i]['y']);
    $cx += ($points[$i]['x'] + $points[$j]['x']) * $ct;
    $cy += ($points[$i]['y'] + $points[$j]['y']) * $ct;
  }
  $cx = intval(round(abs($cx/(6.0*$area))));
  $cy = intval(round(abs($cy/(6.0*$area))));
  return array('x'=>$cx, 'y'=>$cy);
}

function _CompareXY($a, $b) {
  if ( $a['min_y'] == $b['min_y'] )
    return intval($a['min_x'] - $b['min_x']);
  else
    return intval($a['min_y'] - $b['min_y']);
}

function _CompareX($a, $b) {
  return intval($a['min_x'] - $b['min_x']);
}

function getPolyArea($points) {
  global $debug;

  $n_coords = count($points);
  $global_edges = array();
  for ( $j = 0, $i = $n_coords-1; $j < $n_coords; $i = $j++ ) {
    $x1 = $points[$i]['x'];
    $x2 = $points[$j]['x'];
    $y1 = $points[$i]['y'];
    $y2 = $points[$j]['y'];

    //printf( "x1:%d,y1:%d x2:%d,y2:%d\n", x1, y1, x2, y2 );
    if ( $y1 == $y2 )
      continue;

    $dx = $x2 - $x1;
    $dy = $y2 - $y1;

    $global_edges[] = array(
        'min_y' => $y1<$y2?$y1:$y2,
        'max_y' => ($y1<$y2?$y2:$y1)+1,
        'min_x' => $y1<$y2?$x1:$x2,
        '_1_m' => $dx/$dy,
        );
  }

  usort($global_edges, '_CompareXY');

  if ( $debug ) {
    for ( $i = 0; $i < count($global_edges); $i++ ) {
      printf('%d: min_y: %d, max_y:%d, min_x:%.2f, 1/m:%.2f<br>',
        $i,
        $global_edges[$i]['min_y'],
        $global_edges[$i]['max_y'],
        $global_edges[$i]['min_x'],
        $global_edges[$i]['_1_m']);
    }
  }

  $area = 0.0;
  $active_edges = array();
  $y = $global_edges[0]['min_y'];
  do {
    for ( $i = 0; $i < count($global_edges); $i++ ) {
      if ( $global_edges[$i]['min_y'] == $y ) {
        if ( $debug ) printf('Moving global edge<br>');
        $active_edges[] = $global_edges[$i];
        array_splice($global_edges, $i, 1);
        $i--;
      } else {
        break;
      }
    }
    usort($active_edges, '_CompareX');
    if ( $debug ) {
      for ( $i = 0; $i < count($active_edges); $i++ ) {
        printf('%d - %d: min_y: %d, max_y:%d, min_x:%.2f, 1/m:%.2f<br>',
          $y, $i,
          $active_edges[$i]['min_y'],
          $active_edges[$i]['max_y'],
          $active_edges[$i]['min_x'],
          $active_edges[$i]['_1_m']);
      }
    }
    $last_x = 0;
    $row_area = 0;
    $parity = false;
    for ( $i = 0; $i < count($active_edges); $i++ ) {
      $x = intval(round($active_edges[$i]['min_x']));
      if ( $parity ) {
        $row_area += ($x - $last_x)+1;
        $area += $row_area;
      }
      if ( $active_edges[$i]['max_y'] != $y )
        $parity = !$parity;
      $last_x = $x;
    }
    if ( $debug ) printf('%d: Area:%d<br>', $y, $row_area);
    $y++;
    for ( $i = 0; $i < count($active_edges); $i++ ) {
      if ( $y >= $active_edges[$i]['max_y'] ) { // Or >= as per sheets
        if ( $debug ) printf('Deleting active_edge<br>');
        array_splice($active_edges, $i, 1);
        $i--;
      } else {
        $active_edges[$i]['min_x'] += $active_edges[$i]['_1_m'];
      }
    }
  } while ( count($global_edges) || count($active_edges) );
  if ( $debug ) printf('Area:%d<br>', $area);
  return $area;
}

function getPolyAreaOld($points) {
  $area = 0.0;
  $edge = 0.0;
  for ( $i = 0, $j = count($points)-1; $i < count($points); $j = $i++ ) {
    $x_diff = ($points[$i]['x'] - $points[$j]['x']);
    $y_diff = ($points[$i]['y'] - $points[$j]['y']);
    $y_sum = ($points[$i]['y'] + $points[$j]['y']);
    $trap_edge = sqrt(pow(abs($x_diff)+1,2) + pow(abs($y_diff)+1,2) );
    $edge += $trap_edge;
    $trap_area = ($x_diff * $y_sum );
    $area += $trap_area;
    printf('%d->%d, %d-%d=%.2f, %d+%d=%.2f(%.2f), %.2f, %.2f<br>',
      $i, $j,
      $points[$i]['x'], $points[$j]['x'],
      $x_diff,
      $points[$i]['y'], $points[$j]['y'],
      $y_sum, $y_diff, $trap_area, $trap_edge);
  }
  $edge = intval(round(abs($edge)));
  $area = intval(round((abs($area)+$edge)/2));
  echo "E:$edge<br>";
  echo "A:$area<br>";
  return $area;
}

function mapCoords($a) {
  return $a['x'].','.$a['y'];
}

function pointsToCoords($points) {
  return join(' ', array_map('mapCoords', $points));
}

function coordsToPoints($coords) {
  $points = array();
  if ( preg_match_all('/(\d+,\d+)+/', $coords, $matches) ) {
    for ( $i = 0; $i < count($matches[1]); $i++ ) {
      if ( preg_match('/(\d+),(\d+)/', $matches[1][$i], $cmatches) ) {
        $points[] = array('x'=>$cmatches[1], 'y'=>$cmatches[2]);
      } else {
        echo('Bogus coordinates ('.$matches[$i].')');
        return false;
      }
    }
  } else {
    echo('Bogus coordinate string '.$coords);
    return false;
  }
  return $points;
}

function limitPoints(&$points, $min_x, $min_y, $max_x, $max_y) {
  foreach ( $points as &$point ) {
    if ( $point['x'] < $min_x ) {
      ZM\Debug('Limiting point x'.$point['x'].' to min_x '.$min_x);
      $point['x'] = $min_x;
    } else if ( $point['x'] > $max_x ) {
      ZM\Debug('Limiting point x'.$point['x'].' to max_x '.$max_x);
      $point['x'] = $max_x;
    }
    if ( $point['y'] < $min_y ) {
      ZM\Debug('Limiting point y'.$point['y'].' to min_y '.$min_y);
      $point['y'] = $min_y;
    } else if ( $point['y'] > $max_y ) {
      ZM\Debug('Limiting point y'.$point['y'].' to max_y '.$max_y);
      $point['y'] = $max_y;
    }
  } // end foreach point
} // end function limitPoints( $points, $min_x, $min_y, $max_x, $max_y )

function scalePoints(&$points, $scale) {
  foreach ( $points as &$point ) {
    $point['x'] = reScale($point['x'], $scale);
    $point['y'] = reScale($point['y'], $scale);
  }
}

function getLanguages() {
  $langs = array();
  foreach ( glob('lang/*_*.php') as $file ) {
    preg_match('/([^\/]+_.+)\.php/', $file, $matches);
    $langs[$matches[1]] = $matches[1];
  }
  return $langs;
}

function trimString($string, $length) {
  return preg_replace('/^(.{'.$length.',}?)\b.*$/', '\\1&hellip;', $string);
}

function monitorIdsToNames($ids) {
  global $mITN_monitors;
  if ( !$mITN_monitors ) {
    $sql = 'SELECT Id, Name FROM Monitors WHERE `Deleted`=false';
    foreach ( dbFetchAll($sql) as $monitor ) {
      $mITN_monitors[$monitor['Id']] = $monitor;
    }
  }
  $names = array();
  if ( ! is_array($ids) ) {
    $ids = preg_split('/\s*,\s*/', $ids);
  }
  foreach ( $ids as $id ) {
    if ( visibleMonitor($id) ) {
      if ( isset($mITN_monitors[$id]) ) {
        $names[] = $mITN_monitors[$id]['Name'];
      }
    }
  }
  $name_string = join(', ', $names);
  return $name_string;
}

function initX10Status() {
  global $x10_status;

  if ( !isset($x10_status) ) {
    $socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
    if ( $socket < 0 ) {
      ZM\Fatal('socket_create() failed: '.socket_strerror($socket));
    }
    $sock_file = ZM_PATH_SOCKS.'/zmx10.sock';
    if ( @socket_connect($socket, $sock_file) ) {
      $command = 'status';
      if ( !socket_write($socket, $command) ) {
        ZM\Fatal('Can\'t write to control socket: '.socket_strerror(socket_last_error($socket)));
      }
      socket_shutdown($socket, 1);
      $x10Output = '';
      while ( $x10Response = socket_read($socket, 256) ) {
        $x10Output .= $x10Response;
      }
      socket_close($socket);
    } else {
      // Can't connect so use script
      $command = ZM_PATH_BIN.'/zmx10.pl --command status';
      //$command .= " 2>/dev/null >&- <&- >/dev/null";

      $x10Output = exec(escapeshellcmd($command));
    }
    foreach ( explode("\n", $x10Output) as $x10Response ) {
      if ( preg_match('/^(\d+)\s+(.+)$/', $x10Response, $matches) ) {
        $x10_status[$matches[1]] = $matches[2];
      }
    }
  }
}

function getDeviceStatusX10($key) {
  global $x10_status;

  initX10Status();

  if ( empty($x10_status[$key]) || !($status = $x10_status[$key]) )
    $status = 'unknown';
  return $status;
}

function setDeviceStatusX10($key, $status) {
  $socket = socket_create(AF_UNIX, SOCK_STREAM, 0);
  if ( $socket < 0 ) {
    ZM\Fatal('socket_create() failed: '.socket_strerror($socket));
  }
  $sock_file = ZM_PATH_SOCKS.'/zmx10.sock';
  if ( @socket_connect($socket, $sock_file) ) {
    $command = "$status;$key";
    if ( !socket_write($socket, $command) ) {
      ZM\Fatal('Can\'t write to control socket: '.socket_strerror(socket_last_error($socket)));
    }
    socket_shutdown($socket, 1);
    $x10Response = socket_read($socket, 256);
    socket_close($socket);
  } else {
    // Can't connect so use script
    $command = ZM_PATH_BIN.'/zmx10.pl --command '.escapeshellarg($status);
    $command .= ' --unit-code '.escapeshellarg( $key );
    //$command .= " 2>/dev/null >&- <&- >/dev/null";
    $x10Response = exec($command);
  }
  if ( preg_match('/^'.$key.'\s+(.*)/', $x10Response, $matches) )
    $status = $matches[1];
  else
    $status = 'unknown';
  return $status;
}

function logState() {
  $state = 'ok';

  $levelCounts = array(
      ZM\Logger::FATAL => array( ZM_LOG_ALERT_FAT_COUNT, ZM_LOG_ALARM_FAT_COUNT ),
      ZM\Logger::ERROR => array( ZM_LOG_ALERT_ERR_COUNT, ZM_LOG_ALARM_ERR_COUNT ),
      ZM\Logger::WARNING => array( ZM_LOG_ALERT_WAR_COUNT, ZM_LOG_ALARM_WAR_COUNT ),
      );

  # This is an expensive request, as it has to hit every row of the Logs Table
  $sql = 'SELECT Level, COUNT(Level) AS LevelCount FROM Logs WHERE Level < '.ZM\Logger::INFO.' AND TimeKey > unix_timestamp(now() - interval '.ZM_LOG_CHECK_PERIOD.' second) GROUP BY Level ORDER BY Level ASC';
  $counts = dbFetchAll($sql);
  if ( $counts ) {
    foreach ( $counts as $count ) {
      if ( $count['Level'] <= ZM\Logger::PANIC )
        $count['Level'] = ZM\Logger::FATAL;
      if ( !($levelCount = $levelCounts[$count['Level']]) ) {
        ZM\Error('Unexpected Log level '.$count['Level']);
        next;
      }
      if ( $levelCount[1] && $count['LevelCount'] >= $levelCount[1] ) {
        $state = 'alarm';
        break;
      } elseif ( $levelCount[0] && $count['LevelCount'] >= $levelCount[0] ) {
        $state = 'alert';
      }
    }
  }
  return $state;
}

function isVector(&$array) {
  $next_key = 0;
  foreach ( array_keys($array) as $key ) {
    if ( !is_int($key) )
      return false;
    if ( $key != $next_key++ )
      return false;
  }
  return true;
}

function checkJsonError($value) {
  if ( function_exists('json_last_error') ) {
    $value = var_export($value, true);
    switch ( json_last_error() ) {
      case JSON_ERROR_DEPTH :
        ZM\Error("Unable to decode JSON string '$value', maximum stack depth exceeded");
        $backTrace = debug_backtrace();
        ZM\Debug($message.' from '.print_r($backTrace, true));
        break;
      case JSON_ERROR_CTRL_CHAR :
        ZM\Error("Unable to decode JSON string '$value', unexpected control character found");
        $backTrace = debug_backtrace();
        ZM\Debug($message.' from '.print_r($backTrace, true));
        break;
      case JSON_ERROR_STATE_MISMATCH :
        ZM\Error("Unable to decode JSON string '$value', invalid or malformed JSON");
        $backTrace = debug_backtrace();
        ZM\Debug($message.' from '.print_r($backTrace, true));
        break;
      case JSON_ERROR_SYNTAX :
        ZM\Error("Unable to decode JSON string '$value', syntax error");
        $backTrace = debug_backtrace();
        ZM\Debug($message.' from '.print_r($backTrace, true));
        break;
      default :
        ZM\Error("Unable to decode JSON string '$value', unexpected error ".json_last_error());
        $backTrace = debug_backtrace();
        ZM\Debug($message.' from '.print_r($backTrace, true));
        break;
      case JSON_ERROR_NONE:
        break;
    }
  }
}

function jsonEncode(&$value) {
  if ( function_exists('json_encode') ) {
    $string = json_encode( $value );
    checkJsonError($value);
    return $string;
  }

  switch ( gettype($value) ) {
    case 'double':
    case 'integer':
      return $value;
    case 'boolean':
      return $value ? 'true' : 'false';
    case 'string':
      return '"'.preg_replace("/\r?\n/", '\\n', addcslashes($value,'"\\/')).'"';
    case 'NULL':
      return 'null';
    case 'object':
      return '"Object '.addcslashes(get_class($value),'"\\/').'"';
    case 'array':
      if ( isVector( $value ) )
        return '['.join(',', array_map('jsonEncode', $value)).']';
      else {
        $result = '{';
        foreach ($value as $subkey => $subvalue ) {
          if ( $result != '{' )
            $result .= ',';
          $result .= '"'.$subkey.'":'.jsonEncode($subvalue);
        }
        return $result.'}';
      }
    default:
      return '"'.addcslashes(gettype($value),'"\\/').'"';
  }
}

function jsonDecode($value) {
  if ( function_exists('json_decode') ) {
    $object = json_decode($value, true);
    checkJsonError($value);
    return $object;
  }

  $comment = false;
  $unescape = false;
  $out = '$result=';
  for ( $i = 0; $i < strlen($value); $i++ ) {
    if ( !$comment ) {
      if ( ($value[$i] == '{') || ($value[$i] == '[') ) {
        $out .= ' array(';
      } else if ( ($value[$i] == '}') || ($value[$i] == ']') ) {
        $out .= ')';
      } else if ( $value[$i] == ':' ) {
        $out .= '=>';
      } else {
        $out .= $value[$i];
      }
    } else if ( !$unescape ) {
      if ( $value[$i] == '\\' )
        $unescape = true;
      else
        $out .= $value[$i];
    } else {
      if ( $value[$i] != '/' )
        $out .= '\\';
      $out .= $value[$i];
      $unescape = false;
    }
    if ( $value[$i] == '"' ) {
      $comment = !$comment;
    }
  }
  eval($out.';');
  return $result;
}

define('HTTP_STATUS_OK', 200);
define('HTTP_STATUS_BAD_REQUEST', 400);
define('HTTP_STATUS_FORBIDDEN', 403);

function ajaxError($message, $code=HTTP_STATUS_OK) {
  $backTrace = debug_backtrace();
  ZM\Debug($message.' from '.print_r($backTrace, true));
  if ( function_exists('ajaxCleanup') )
    ajaxCleanup();
  if ( $code == HTTP_STATUS_OK ) {
    $response = array('result'=>'Error', 'message'=>$message);
    header('Content-type: application/json');
    exit(jsonEncode($response));
  }
  header("HTTP/1.0 $code $message");
  exit();
}

function ajaxResponse($result=false) {
  if ( function_exists('ajaxCleanup') )
    ajaxCleanup();
  $response = array('result'=>'Ok');
  if ( is_array($result) ) {
    $response = array_merge($response, $result);
  } else if ( !empty($result) ) {
    $response['message'] = $result;
  }
  header('Content-type: application/json');
  exit(jsonEncode($response));
}

function generateConnKey() {
  return rand(1, 999999);
}

function detaintPathAllowAbsolute($path) {
  // Strip out :// because php:// is a way to inject code apparently
  $path = str_replace('://', '', $path);
  // Remove any absolute paths, or relative ones that want to go up
  do {
    $path = str_replace('../', '', $path, $count);
  } while($count);
  return $path;
}

function detaintPath($path) {

  // Strip out :// because php:// is a way to inject code apparently
  $path = str_replace('://', '', $path);
  // Remove any absolute paths, or relative ones that want to go up
  do {
    $path = str_replace('../', '', $path, $count);
  } while($count);
  $path = ltrim($path, '/');
  return $path;
}

function cache_bust($file) {
  # Use the last modified timestamp to create a link that gets a different filename
  # To defeat caching.  Should probably use md5 hash
  $parts = pathinfo($file);
  global $css;
  $dirname = str_replace('/', '_', $parts['dirname']);
  $cacheFile = $dirname.'_'.$parts['filename'].'-'.$css.'-'.filemtime($file).'.'.$parts['extension'];
  if (
    @symlink(ZM_PATH_WEB.'/'.$file, ZM_DIR_CACHE.'/'.$cacheFile)
    or
    file_exists(ZM_DIR_CACHE.'/'.$cacheFile)
  ) {
    return 'cache/'.$cacheFile;
  } else {
    ZM\Warning('Failed linking '.$file.' to '.$cacheFile);
  }
  return $file;
}

function getSkinFile($file) {
  global $skinBase;
  $skinFile = false;
  foreach ( $skinBase as $skin ) {
    $tempSkinFile = detaintPath('skins/'.$skin.'/'.$file);
    if ( file_exists($tempSkinFile) )
      $skinFile = $tempSkinFile;
  }
  return $skinFile;
}

function getSkinIncludes($file, $includeBase=false, $asOverride=false) {
  global $skinBase;
  $skinFile = false;
  foreach ( $skinBase as $skin ) {
    $tempSkinFile = detaintPath('skins/'.$skin.'/'.$file);
    if ( file_exists($tempSkinFile) )
      $skinFile = $tempSkinFile;
  }
  $includeFiles = array();
  if ( $asOverride ) {
    if ( $skinFile )
      $includeFiles[] = $skinFile;
    else if ( $includeBase )
      $includeFiles[] = $file;
  } else {
    if ( $includeBase )
      $includeFiles[] = $file;
    if ( $skinFile )
      $includeFiles[] = $skinFile;
  }
  return $includeFiles;
}

function requestVar($name, $default='') {
  return isset($_REQUEST[$name]) ? validHtmlStr($_REQUEST[$name]) : $default;
}

// For numbers etc in javascript or tags etc
function validInt($input) {
  return preg_replace('/[^\-\d]/', '', $input);
}

function validCardinal($input) {
  return preg_replace('/\D/', '', $input);
}

function validNum( $input ) {
  return preg_replace('/[^\d.-]/', '', $input);
}

// For general strings
function validStr($input) {
  if (is_null($input)) return '';
  return strip_tags($input);
}

// For strings in javascript or tags etc, expected to be in quotes so further quotes escaped rather than converted
function validJsStr($input) {
  if (is_null($input)) return '';
  return strip_tags(addslashes($input));
}

// For general text in pages outside of tags or quotes so quotes converted to entities
function validHtmlStr($input) {
  if (is_null($input)) return '';
  return htmlspecialchars($input, ENT_QUOTES);
}

/* options['width'] is the desired view width not necessarily the image width requested.
 * It can be % in which case we us it to set the scale
 * It can be px in which case we can use it to calculate the scale
 * Same width height.  If both are set we should calculate the smaller resulting scale
 */
function getStreamHTML($monitor, $options = array()) {
  return $monitor->getStreamHTML($options);
} // end function getStreamHTML

function getStreamMode( ) {
  $streamMode = '';
  if ( (ZM_WEB_STREAM_METHOD == 'mpeg') && ZM_MPEG_LIVE_FORMAT ) {
    $streamMode = 'mpeg';
  } elseif ( canStream() ) {
    $streamMode = 'jpeg';
  } else {
    $streamMode = 'single';
    ZM\Info('The system has fallen back to single jpeg mode for streaming. Consider enabling Cambozola or upgrading the client browser.');
  }
  return $streamMode;
} // end function getStreamMode

function folder_size($dir) {
  $size = 0;
  foreach (glob(rtrim($dir, '/').'/*', GLOB_NOSORT) as $each) {
    $size += is_file($each) ? filesize($each) : folder_size($each);
  }
  return $size;
} // end function folder_size

function human_filesize($size, $precision = 2) {
  if ($size === null) {
    return 'null';
  }
  $units = array('B ','kB','MB','GB','TB','PB','EB','ZB','YB');
  $step = 1024;
  $i = 0;
  while (($size / $step) > 0.9) {
    $size = $size / $step;
    $i++;
  }
  # The idea is that we can right align this and have the digits columns line up nicely.
  return sprintf('%.'.$precision.'f', round($size, $precision)).$units[$i];
}

function csrf_startup() {
  csrf_conf('rewrite-js', 'includes/csrf/csrf-magic.js');
}

function check_timezone() {
  $now = new DateTime();

  $sys_tzoffset = trim(shell_exec('date "+%z"'));
  $php_tzoffset = trim($now->format('O'));
  $mysql_tzoffset = trim(dbFetchOne(
    'SELECT TIME_FORMAT(TIMEDIFF(NOW(), UTC_TIMESTAMP),\'%H%i\');',
    'TIME_FORMAT(TIMEDIFF(NOW(), UTC_TIMESTAMP),\'%H%i\')'
  ));

  #Debug("System timezone offset determine to be: $sys_tzoffset,\x20
                 #PHP timezone offset determine to be: $php_tzoffset,\x20
                 #Mysql timezone offset determine to be: $mysql_tzoffset
               #");

  if ( $sys_tzoffset != $php_tzoffset )
    ZM\Error("ZoneMinder is not configured properly: php's date.timezone $php_tzoffset does not match the system timezone $sys_tzoffset! Please check Options->System->Timezone.");

  if ( $sys_tzoffset != $mysql_tzoffset )
    ZM\Error('ZoneMinder is not configured properly: mysql\'s timezone does not match the system timezone! Event lists will display incorrect times.');

  if (!ini_get('date.timezone') || !date_default_timezone_set(ini_get('date.timezone')))
    ZM\Error('ZoneMinder is not configured properly: php\'s date.timezone is not set to a valid timezone. Please check Options->System->Timezone');

}

function unparse_url($parsed_url, $substitutions = array() ) {
  $fields = array('scheme','host','port','user','pass','path','query','fragment');

  foreach ( $fields as $field ) {
    if ( isset( $substitutions[$field] ) ) {
      $parsed_url[$field] = $substitutions[$field];
    }
  }
  $scheme   = isset($parsed_url['scheme']) ? $parsed_url['scheme'] . '://' : '';
  $host     = isset($parsed_url['host']) ? $parsed_url['host'] : '';
  $port     = isset($parsed_url['port']) ? ':' . $parsed_url['port'] : '';
  $user     = isset($parsed_url['user']) ? $parsed_url['user'] : '';
  $pass     = isset($parsed_url['pass']) ? ':' . $parsed_url['pass']  : '';
  $pass     = ($user || $pass) ? $pass.'@' : '';
  $path     = isset($parsed_url['path']) ? $parsed_url['path'] : '';
  $query    = isset($parsed_url['query']) ? '?' . $parsed_url['query'] : '';
  $fragment = isset($parsed_url['fragment']) ? '#' . $parsed_url['fragment'] : '';
  return $scheme.$user.$pass.$host.$port.$path.$query.$fragment;
}

// PP - POST request handler for PHP which does not need extensions
// credit: http://wezfurlong.org/blog/2006/nov/http-post-from-php-without-curl/

function do_request($method, $url, $data=array(), $optional_headers = null) {
  global $php_errormsg;

  $params = array('http' => array(
        'method' => $method,
        'content' => $data
        ));
  if ( $optional_headers !== null ) {
    $params['http']['header'] = $optional_headers;
  }
  $ctx = stream_context_create($params);
  $fp = @fopen($url, 'rb', false, $ctx);
  if ( !$fp ) {
    throw new Exception("Problem with $url, $php_errormsg");
  }
  $response = @stream_get_contents($fp);
  if ( $response === false ) {
    throw new Exception("Problem reading data from $url, $php_errormsg");
  }
  return $response;
}

function do_post_request($url, $data, $optional_headers = null) {
  $params = array('http' => array(
        'method' => 'POST',
        'content' => $data
        ));
  if ( $optional_headers !== null ) {
    $params['http']['header'] = $optional_headers;
  }
  $ctx = stream_context_create($params);
  $fp = @fopen($url, 'rb', false, $ctx);
  if ( !$fp ) {
    throw new Exception('Problem with '.$url.', '
      .print_r(error_get_last(),true));
  }
  $response = @stream_get_contents($fp);
  if ( $response === false ) {
    throw new Exception('Problem reading data from '.$url.', data: '.print_r($params,true)
      .print_r(error_get_last(),true));
  }
  return $response;
}

// The following works around php not being built with semaphore functions.
if ( !function_exists('sem_get') ) {
  function sem_get($key) {
    return fopen(__FILE__ . '.sem.' . $key, 'w+');
  }
  function sem_acquire($sem_id) {
    return flock($sem_id, LOCK_EX);
  }
  function sem_release($sem_id) {
    return flock($sem_id, LOCK_UN);
  }
}

if ( !function_exists('ftok') ) {
  function ftok($filename = '', $proj = '') {
    if ( empty($filename) || !file_exists($filename) ) {
      return -1;
    } else {
      $filename = $filename . (string) $proj;
      for($key = array(); sizeof($key) < strlen($filename); $key[] = ord(substr($filename, sizeof($key), 1)));
      return dechex(array_sum($key));
    }
  }
}

function getAffectedIds( $name ) {
  $names = $name.'s';
  $ids = array();
	if ( isset($_REQUEST[$names]) ) {
		if ( is_array($_REQUEST[$names]) ) {
			$ids = $_REQUEST[$names];
		} else {
			$ids = array($_REQUEST[$names]);
		}
	} else if ( isset($_REQUEST[$name]) ) {
		if ( is_array($_REQUEST[$name]) ) {
			$ids = $_REQUEST[$name];
		} else {
			$ids = array($_REQUEST[$name]);
		}
	}
	return $ids;
}

function format_duration($time, $separator=':') {
  return sprintf('%02d%s%02d%s%02d', floor($time/3600), $separator, ($time/60)%60, $separator, $time%60);
}

function array_recursive_diff($aArray1, $aArray2) {
  $aReturn = array();
  if ( ! (is_array($aArray1) and is_array($aArray2) ) ) {
    $backTrace = debug_backtrace();
    ZM\Warning('Bad arrays passed 1:' . print_r($aArray1,true) . PHP_EOL.'2: '.print_r($aArray2,true).PHP_EOL.' from: '.print_r($backTrace,true));
    return;
  }

  foreach ( $aArray1 as $mKey => $mValue ) {
    if ( array_key_exists($mKey, $aArray2) ) {
      if ( is_array($mValue) ) {
        if ( is_array($aArray2[$mKey]) ) {
          $aRecursiveDiff = array_recursive_diff($mValue, $aArray2[$mKey]);
          if ( count($aRecursiveDiff) ) {
            $aReturn[$mKey] = $aRecursiveDiff;
          }
        } else {
          $aReturn[$mKey] = $mValue;
        }
      } else {
        if ( $mValue != $aArray2[$mKey] ) {
          $aReturn[$mKey] = $mValue;
        }
      }
    } else {
      $aReturn[$mKey] = $mValue;
    }
  }
  # Now check for keys in array2 that are not in array1
  foreach ($aArray2 as $mKey => $mValue) {
    if ( array_key_exists($mKey, $aArray1) ) {
      # Already checked it... I think.
      #if ( is_array($mValue) ) {
        #$aRecursiveDiff = array_recursive_diff($mValue, $aArray2[$mKey]);
        #if ( count($aRecursiveDiff) ) {
          #$aReturn[$mKey] = $aRecursiveDiff;
        #}
      #} else {
        #if ( $mValue != $aArray2[$mKey] ) {
          #$aReturn[$mKey] = $mValue;
        #}
      #}
    } else {
      $aReturn[$mKey] = $mValue;
    }
  }

  return $aReturn;
}

function html_input($name, $type='text', $value='', $options=array()) {
  $html = '<input ';
  $attributes = [];
  $options = array_merge($options, ['name'=>$name, 'value'=>$value, 'type'=>$type]);

  foreach (array_keys($options) as $k) {
    $attributes[] = $k.'="'.$options[$k].'"';
  }
  $html .= join(' ', $attributes);
  $html .= '/>';
  return $html;
}

function html_radio($name, $values, $selected=null, $options=array(), $attrs=array()) {

  $html = '';
  if ( isset($options['default']) and ( $selected == null ) ) {
    $selected = $options['default'];
  } # end if

  foreach ( $values as $value => $label ) {
    if ( isset($options['container']) ) {
      $html .= $options['container'][0];
    }
    $attributes = array_map(
          function($attr, $value){return $attr.'="'.$value.'"';},
          array_keys($attrs),
          array_values($attrs)
        );
    $attributes_string = implode(' ', $attributes);

    $html .= sprintf('
      <div class="form-check%7$s">
        <label class="form-check-label radio%7$s" for="%1$s%6$s%2$s">
        <input class="form-check-input" type="radio" name="%1$s" value="%2$s" id="%1$s%6$s%2$s" %4$s%5$s />
        %3$s</label></div>
        ', $name, $value, $label, ($value==$selected?' checked="checked"':''),
        $attributes_string,
        (isset($options['id']) ? $options['id'] : ''),
        ( ( (!isset($options['inline'])) or $options['inline'] ) ? '-inline' : '')
      );
    if ( isset($options['container']) ) {
      $html .= $options['container'][1];
    }
  } # end foreach value
  return $html;
} # end sub html_radio


function random_colour() {
  return '#'.
    str_pad( dechex( mt_rand(0, 255) ), 2, '0', STR_PAD_LEFT).
    str_pad( dechex( mt_rand(0, 255) ), 2, '0', STR_PAD_LEFT).
    str_pad( dechex( mt_rand(0, 255) ), 2, '0', STR_PAD_LEFT);
}

function zm_random_bytes($length = 32) {
  if ( !isset($length) || intval($length) <= 8 ) {
    $length = 32;
  }
  if ( function_exists('random_bytes') ) {
    return random_bytes($length);
  }
  if ( function_exists('mcrypt_create_iv') ) {
    return mcrypt_create_iv($length, MCRYPT_DEV_URANDOM);
  }
  if ( function_exists('openssl_random_pseudo_bytes') ) {
    return openssl_random_pseudo_bytes($length);
  }
  ZM\Error('No random_bytes function found.');
}

function i18n() {
  $string = explode('_', ZM_LANG_DEFAULT, 2);
  $string[1] = strtoupper($string[1]);

  return implode('-', $string);
}

function get_networks() {
  $interfaces = array();

  if (defined('ZM_PATH_IP') and ZM_PATH_IP and file_exists(ZM_PATH_IP)) {
	  exec(ZM_PATH_IP.' link', $output, $status);
	  if ( $status ) {
	    $html_output = implode('<br/>', $output);
	    ZM\Error("Unable to list network interfaces, status is '$status'. Output was:<br/><br/>$html_output");
	  } else {
	    foreach ( $output as $line ) {
	      if ( preg_match('/^\d+: ([[:alnum:]]+):/', $line, $matches ) ) {
          if ( $matches[1] != 'lo' ) {
            $interfaces[$matches[1]] = $matches[1];
          } else {
            ZM\Debug("No match for $line");
          }
        }
	    }
	  }
	  $routes = array();
	  exec(ZM_PATH_IP.' route', $output, $status);
	  if ($status) {
	    $html_output = implode('<br/>', $output);
	    ZM\Error("Unable to list network interfaces, status is '$status'. Output was:<br/><br/>$html_output");
	  } else {
	    foreach ($output as $line) {
	      if ( preg_match('/^default via [.[:digit:]]+ dev ([[:alnum:]]+)/', $line, $matches) ) {
          $interfaces['default'] = $matches[1];
	      } else if ( preg_match('/^([.[:digit:]]+\/[[:digit:]]+) dev ([[:alnum:]]+)/', $line, $matches) ) {
          $interfaces[$matches[2]] .= ' ' . $matches[1];
          ZM\Debug("Matched $line: $matches[2] .= $matches[1]");
        } else {
          ZM\Debug("Didn't match $line");
        }
      } # end foreach line of output
	  }
  } else if (defined('ZM_PATH_IFCONFIG') and ZM_PATH_IFCONFIG and file_exists(ZM_PATH_IFCONFIG)) {
	  exec(ZM_PATH_IFCONFIG, $output, $status);
	  if ($status) {
	    $html_output = implode("\n", $output);
	    ZM\Error("Unable to list network interfaces, status is '$status'. Output was:$html_output");
	  } else {
		  preg_match("/^([eth|enp][A-z0-9]*)\s+Link\s+encap:([A-z]*)\s+HWaddr\s+([A-z0-9:]*).*".
			"inet addr:([0-9.]+).*Bcast:([0-9.]+).*Mask:([0-9.]+).*".
			"MTU:([0-9.]+).*Metric:([0-9.]+).*".
			"RX packets:([0-9.]+).*errors:([0-9.]+).*dropped:([0-9.]+).*overruns:([0-9.]+).*frame:([0-9.]+).*".
			"TX packets:([0-9.]+).*errors:([0-9.]+).*dropped:([0-9.]+).*overruns:([0-9.]+).*carrier:([0-9.]+).*".
			"RX bytes:([0-9.]+).*\((.*)\).*TX bytes:([0-9.]+).*\((.*)\)".
			"/ims", implode("\n", $output), $regex);

		  ZM\Debug(print_r( $regex,true));
	  }
  }
  return $interfaces;
}

# Returns an array of subnets like 192.168.1.0/24 for a given interface.
# Will ignore mdns networks.

function get_subnets($interface) {
  $subnets = array();
  if (defined('ZM_PATH_IP') and ZM_PATH_IP and file_exists(ZM_PATH_IP)) {
    exec(ZM_PATH_IP.' route', $output, $status);
    if ( $status ) {
      $html_output = implode('<br/>', $output); 
      ZM\Error("Unable to list network interfaces, status is '$status'. Output was:<br/><br/>$html_output");
    } else {
      foreach ($output as $line) {
        if (preg_match('/^([.[:digit:]]+\/[[:digit:]]+) dev ([[:alnum:]]+)/', $line, $matches)) {
          if ($matches[1] == '169.254.0.0/16') {
            # Ignore mdns
          } else if ($matches[2] == $interface) {
            $subnets[] = $matches[1];
          } else {
            ZM\Debug("Wrong interface $matches[1] != $interface");
          }
        } else {
          ZM\Debug("Didn't match $line");
        }
      } # end foreach line of output
    }
  }
  return $subnets;
} # end function get_subnets($interface)

function extract_auth_values_from_url($url) {
  $protocolPrefixPos = strpos($url, '://');
  if ($protocolPrefixPos === false)
    return array();

  $authSeparatorPos = strpos($url, '@', $protocolPrefixPos+3);
  if ($authSeparatorPos === false)
    return array();

  $fieldsSeparatorPos = strpos($url, ':', $protocolPrefixPos+3);
  if ($fieldsSeparatorPos === false || $authSeparatorPos < $fieldsSeparatorPos)
    return array();

  $username = substr( $url, $protocolPrefixPos+3, $fieldsSeparatorPos-($protocolPrefixPos+3) );
  $password = substr( $url, $fieldsSeparatorPos+1, $authSeparatorPos-$fieldsSeparatorPos-1 );

  // URL decode the credentials since they may contain encoded special characters
  // from ONVIF probe or manual URL entry
  $username = urldecode($username);
  $password = urldecode($password);

  return array( $username, $password );
}

function output_file($path, $chunkSize=1024) {
  if (connection_status() != 0)
    return false;
  $parts = pathinfo($path);
  $file = $parts['basename'];

  $contentType = getMimeType($path);

  header('Cache-Control: public');
  header('Content-Transfer-Encoding: binary');
  header("Content-Type: $contentType");

  $contentDisposition = 'inline';
  if (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) {
    $file = preg_replace('/\./', '%2e', $file, substr_count($file, '.') - 1);
  }
  header("Content-Disposition: $contentDisposition;filename=\"$file\"");

  header('Accept-Ranges: bytes');
  $range = 0;
  $size = filesize($path);

  if (isset($_SERVER['HTTP_RANGE'])) {
    list($a, $range) = explode('=', $_SERVER['HTTP_RANGE']);
    str_replace($range, '-', $range);
    $range = (int)$range; #fseek etc require integers not strings
    $size2 = $size - 1;
    $new_length = $size - $range;
    header('HTTP/1.1 206 Partial Content');
    header("Content-Length: $new_length");
    header("Content-Range: bytes $range$size2/$size");
  } else {
    $size2 = $size - 1;
    header("Content-Range: bytes 0-$size2/$size");
    header('Content-Length: ' . $size);
  }

  if ($size == 0) {
    Error('Zero byte file! Aborting download');
  }
  @ini_set('magic_quotes_runtime', 0);
  $fp = fopen($path, 'rb');

  fseek($fp, $range);

  while (!feof($fp) and (connection_status() == 0)) {
    set_time_limit(0);
    print(@fread($fp, 1024*$chunkSize));
    flush();
    ob_flush();
  }
  fclose($fp);

  return ((connection_status() == 0) and !connection_aborted());
} # end function output_file

function array_to_hash_by_key($key, $array) {
  $results = array();
  foreach ($array as $a) { 
    if (is_array($a)) {
      $results[$a[$key]] = $a;
    } else {
      $results[$a->$key()] = $a;
    }
  }
  return $results;
}

function check_datetime($x) {
  return (date('Y-m-d H:i:s', strtotime($x)) == $x);
}

function getHomeView() {
  global $user;
  global $skin;
  if ($user and is_object($user) and $user->HomeView()) {
    $view = detaintPath($user->HomeView());
    if (preg_match('/^(\w+)([\w&=]*)$/', $view, $matches)) {
      $path = dirname(__FILE__, 2).'/skins/'.$skin.'/views/'.$matches[1].'.php';
      if (file_exists($path)) {
        return $view;
      } else {
        ZM\Warning('Invalid view '.$user->HomeView().' in HomeView for user '.$user->Username().' does not exist at '.$path);
      }
    } else {
      ZM\Warning('Invalid view '.$user->HomeView().' in HomeView for user '.$user->Username().' does not match regexp');
    }
  }
  if (defined('ZM_WEB_HOMEVIEW') and ZM_WEB_HOMEVIEW) {
    $view = detaintPath(ZM_WEB_HOMEVIEW);
    if (preg_match('/^(\w+)([\w&=]*)$/', $view, $matches)) {
      $path = dirname(__FILE__, 2).'/skins/'.$skin.'/views/'.$matches[1].'.php';
      if (file_exists($path)) {
        return $view;
      } else {
        ZM\Warning('Invalid view '.ZM_WEB_HOMEVIEW.' in ZM_WEB_HOMEVIEW does not exist at '.$path);
      }
    } else {
      ZM\Warning('Invalid view '.ZM_WEB_HOMEVIEW.' in ZM_WEB_HOMEVIEW does not match regexp');
    }
  }
  return 'console';
}

function systemd_isactive($service) {
  $output = shell_exec("systemctl is-active $service");
  return (trim($output) == 'active');
}

function to_string($thing) {
  if (empty($thing)) return '';
  if (is_array($thing)) return implode(', ', $thing);
  return strval($thing);
}
?>
