zoneminder/web/includes/functions.php

<?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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 

// Compatibility functions
if ( version_compare( phpversion(), "4.3.0", "<") ) {
  function ob_get_clean() {
    $buffer = ob_get_contents();
    ob_end_clean();
    return( $buffer );
  }
}

function userLogin( $username, $password="", $passwordHashed=false ) {
  global $user, $cookies;

  $sql = "select * from Users where Enabled = 1";
  $sql_values = NULL;
  if ( ZM_AUTH_TYPE == "builtin" ) {
    if ( $passwordHashed ) {
      $sql .= " AND Username=? AND Password=?";
    } else {
      $sql .= " AND Username=? AND Password=password(?)";
    }
    $sql_values = array( $username, $password );
  } else {
    $sql .= " AND Username = ?";
    $sql_values = array( $username );
  }
  $_SESSION['username'] = $username;
  if ( ZM_AUTH_RELAY == "plain" ) {
    // Need to save this in session
    $_SESSION['password'] = $password;
  }
  $_SESSION['remoteAddr'] = $_SERVER['REMOTE_ADDR']; // To help prevent session hijacking
  if ( $dbUser = dbFetchOne( $sql, NULL, $sql_values ) ) {
    Info( "Login successful for user \"$username\"" );
    $_SESSION['user'] = $user = $dbUser;
    if ( ZM_AUTH_TYPE == "builtin" ) {
      $_SESSION['passwordHash'] = $user['Password'];
    }
  } else {
    Warning( "Login denied for user \"$username\"" );
    unset( $user );
  }
  if ( $cookies )
    session_write_close();
}

function userLogout() {
  global $user;
  $username = $user['Username'];

  Info( "User \"$username\" logged out" );

  unset( $_SESSION['user'] );
  unset( $user );

  session_destroy();
}

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 CORSHeaders() {
  if ( isset( $_SERVER['HTTP_ORIGIN'] ) ) {

# The following is left for future reference/use.
    $valid = false;
    $servers = dbFetchAll( 'SELECT * FROM Servers' );
    if ( sizeof($servers) <= 1 ) {
# Only need CORSHeaders in the event that there are multiple servers in use.
      return;
    }
    foreach( dbFetchAll( 'SELECT * FROM Servers' ) as $row ) {
      $Server = new Server( $row );
      if ( $_SERVER['HTTP_ORIGIN'] == $Server->Url() ) {
        $valid = true;
        header("Access-Control-Allow-Origin: " . $Server->Url() );
        header("Access-Control-Allow-Headers: x-requested-with,x-request");
      }
    }
    if ( ! $valid ) {
      Warning( $_SERVER['HTTP_ORIGIN'] . " is not found in servers list." );
    }
  }
}

function getAuthUser( $auth ) {
  if ( ZM_OPT_USE_AUTH && ZM_AUTH_RELAY == 'hashed' && !empty($auth) ) {
    $remoteAddr = '';
    if ( ZM_AUTH_HASH_IPS ) {
      $remoteAddr = $_SERVER['REMOTE_ADDR'];
      if ( !$remoteAddr ) {
        Error( "Can't determine remote address for authentication, using empty string" );
        $remoteAddr = "";
      }
    }

    if ( $_SESSION['username'] ) {
      # Most of the time we will be logged in already and the session will have our username, so we can significantly speed up our hash testing by only looking at our user.
      # Only really important if you have a lot of users.
      $sql = "SELECT Username, Password FROM Users WHERE Enabled = 1 AND Username='".$_SESSION['username']."'";
    } else {
      $sql = 'SELECT Username, Password FROM Users WHERE Enabled = 1';
    }

    foreach ( dbFetchAll( $sql ) as $user ) {
      $now = time();
      for ( $i = 0; $i < ZM_AUTH_HASH_TTL; $i++, $now -= (3600) ) { // Try for last two hours
        $time = localtime( $now );
        $authKey = ZM_AUTH_HASH_SECRET.$user['Username'].$user['Password'].$remoteAddr.$time[2].$time[3].$time[4].$time[5];
        $authHash = md5( $authKey );

        if ( $auth == $authHash ) {
          return( $user );
        }
      } // end foreach hour
    } // end foreach user
  } // end if using auth hash
  Error( "Unable to authenticate user from auth hash '$auth'" );
  return( false );
}

function generateAuthHash( $useRemoteAddr ) {
  if ( ZM_OPT_USE_AUTH && ZM_AUTH_RELAY == "hashed" ) {
    # regenerate a hash at half the liftetime of a hash, an hour is 3600 so half is 1800
    if ( ( $_SESSION['AuthHashGeneratedAt'] < time() - ( ZM_AUTH_HASH_TTL * 1800 ) ) or ! isset($_SESSION['AuthHash']) ) {
# Don't both regenerating Auth Hash if an hour hasn't gone by yet
      $time = localtime();
      if ( $useRemoteAddr ) {
        $authKey = ZM_AUTH_HASH_SECRET.$_SESSION['username'].$_SESSION['passwordHash'].$_SESSION['remoteAddr'].$time[2].$time[3].$time[4].$time[5];
      } else {
        $authKey = ZM_AUTH_HASH_SECRET.$_SESSION['username'].$_SESSION['passwordHash'].$time[2].$time[3].$time[4].$time[5];
      }
      $auth = md5( $authKey );
      if ( session_status() == PHP_SESSION_NONE ) {
        Warning("Session is not active. AuthHash will not be cached.");
      }
      $_SESSION['AuthHash'] = $auth;
      $_SESSION['AuthHashGeneratedAt'] = time();
    } # end if AuthHash is not cached
    return $_SESSION['AuthHash'];
  } else {
    $auth = "";
  }
  return( $auth );
}

function getStreamSrc( $args, $querySep='&amp;' ) {
  $streamSrc = ZM_BASE_URL.ZM_PATH_ZMS;

  if ( ZM_OPT_USE_AUTH ) {
    if ( ZM_AUTH_RELAY == "hashed" ) {
      $args[] = "auth=".generateAuthHash( ZM_AUTH_HASH_IPS );
    } elseif ( ZM_AUTH_RELAY == "plain" ) {
      $args[] = "user=".$_SESSION['username'];
      $args[] = "pass=".$_SESSION['password'];
    } elseif ( ZM_AUTH_RELAY == "none" ) {
      $args[] = "user=".$_SESSION['username'];
    }
  }
  if ( !in_array( "mode=single", $args ) && !empty($GLOBALS['connkey']) ) {   
    $args[] = "connkey=".$GLOBALS['connkey'];
  }       
  if ( ZM_RAND_STREAM ) {
    $args[] = "rand=".time();
  }

  if ( count($args) ) {
    $streamSrc .= "?".join( $querySep, $args );
  }

  return( $streamSrc );
}

function getMimeType( $file ) {
  if ( function_exists('mime_content_type') ) {
    return( mime_content_type( $file ) );
  } elseif ( 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;
  if ( ZM_WEB_USE_OBJECT_TAGS ) {
    switch( $mimeType ) {
      case "video/x-ms-asf" :
      case "video/x-msvideo" :
      case "video/mp4" :
        {
          if ( isWindows() ) {
            return '<object id="'.$id.'" width="'.$width.'" height="'.$height.'
              classid="CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95"
              codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=6,0,02,902"
              standby="Loading Microsoft Windows Media Player components..."
              type="'.$mimeType.'">
              <param name="FileName" value="'.$src.'"/>
              <param name="autoStart" value="1"/>
              <param name="showControls" value="0"/>
              <embed type="'.$mimeType.'"
              pluginspage="http://www.microsoft.com/Windows/MediaPlayer/"
              src="'.$src.'"
              name="'.$title.'"
              width="'.$width.'"
              height="'.$height.'"
              autostart="1"
              showcontrols="0">
              </embed>
              </object>';
          }
        }
      case "video/quicktime" :
        {
            return '<object id="'.$id.'" width="'.$width.'" height="'.$height.'"
            classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
            codebase="http://www.apple.com/qtactivex/qtplugin.cab"
            type="'.$mimeType.'">
            <param name="src" value="'.$src.'"/>
            <param name="autoplay" VALUE="true"/>
            <param name="controller" VALUE="false"/>
            <embed type="'.$mimeType.'"
            src="'.$src.'"
            pluginspage="http://www.apple.com/quicktime/download/"
            name="'.$title.'" width="'.$width.'" height="'.$height.'"
            autoplay="true"
            controller="true">
            </embed>
            </object>';
        }
      case "application/x-shockwave-flash" :
        {
            return '<object id="'.$id.'" width="'.$width.'" height="'.$height.'"
            classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
            codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"
            type="'.$mimeType.'">
            <param name="movie" value="'.$src.'"/>
            <param name="quality" value="high"/>
            <param name="bgcolor" value="#ffffff"/>
            <embed type="'.$mimeType.'"
            pluginspage="http://www.macromedia.com/go/getflashplayer"
            src="'.$src.'"
            name="'.$title.'"
            width="'.$width.'"
            height="'.$height.'"
            quality="high"
            bgcolor="#ffffff">
            </embed>
            </object>';
        }
    } # end switch
  } # end if use object tags
  return '<embed'. ( isset($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 getImageStream( $id, $src, $width, $height, $title );
}


function getImageStream( $id, $src, $width, $height, $title="" ) {
  if ( canStreamIframe() ) {
      return '<iframe id="'.$id.'" src="'.$src.'" alt="'. validHtmlStr($title) .'" width="'. validInt($width)." height=".validInt($height).'"/>';
  } else {
      return '<img id="'.$id.'" src="'.$src.'" alt="'. validHtmlStr($title) .'" width="'. validInt($width) .'" height="'. validInt( $height ).'"/>';
  }
}

function outputControlStream( $src, $width, $height, $monitor, $scale, $target ) {
?>
  <form name="ctrlForm" method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>" 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
    } elseif ( $monitor['CanMoveRel'] ) {
    ?>
    <input type="hidden" name="control" value="movePseudoMap">
    <?php
    } elseif ( $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 outputHelperStream( $id, $src, $width, $height, $title="" ) {
?>
  <applet id="<?php echo $id ?>" code="com.charliemouse.cambozola.Viewer"
  archive="<?php echo ZM_PATH_CAMBOZOLA ?>"
  align="middle"
  width="<?php echo $width ?>"
  height="<?php echo $height ?>"
  title="<?php echo $title ?>">
  <param name="accessories" value="none"/>
  <param name="url" value="<?php echo $src ?>"/>
  </applet>
<?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="'.$src.'" alt="'.$title.'" width="'.$width.'" height="'.$height.'"/>';
}

function outputControlStill( $src, $width, $height, $monitor, $scale, $target ) {
?>
  <form name="ctrlForm" method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>" 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
    } elseif ( $monitor['CanMoveRel'] ) {
    ?>
    <input type="hidden" name="control" value="movePseudoMap">
    <?php
    } elseif ( $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 ) {
    if ( ZM_AUTH_RELAY == "hashed" ) {
      $zmuCommand .= " -A ".generateAuthHash( false );
    } elseif ( ZM_AUTH_RELAY == "plain" ) {
      $zmuCommand .= " -U " .escapeshellarg($_SESSION['username'])." -P ".escapeshellarg($_SESSION['password']);
    } elseif ( ZM_AUTH_RELAY == "none" ) {
      $zmuCommand .= " -U ".escapeshellarg($_SESSION['username']);
    }
  }

  $zmuCommand .= $args;

  return( $zmuCommand );
}

function visibleMonitor( $mid ) {
  global $user;

  return( empty($user['MonitorIds']) || in_array( $mid, explode( ',', $user['MonitorIds'] ) ) );
}

function canView( $area, $mid=false ) {
  global $user;

  return( ($user[$area] == 'View' || $user[$area] == 'Edit') && ( !$mid || visibleMonitor( $mid ) ) );
}

function canEdit( $area, $mid=false ) {
  global $user;

  return( $user[$area] == 'Edit' && ( !$mid || visibleMonitor( $mid ) ) );
}

function getEventPath( $event ) {
  if ( ZM_USE_DEEP_STORAGE )
    $eventPath = $event['MonitorId'].'/'.strftime( "%y/%m/%d/%H/%M/%S", strtotime($event['StartTime']) );
  else
    $eventPath = $event['MonitorId'].'/'.$event['Id'];
  return( $eventPath );
}


function deletePath( $path ) {
  if ( is_dir( $path ) ) {
    system( escapeshellcmd( "rm -rf ".$path ) );
  } else {
    unlink( $path );
  }
}

function deleteEvent( $event, $mid=false ) { 
  if ( empty($event) ) {
    Error( "Empty event passed to deleteEvent.");
    return;
  }

  if ( gettype($event) != 'array' ) {
# $event could be an eid, so turn it into an event hash
    $event = dbFetchOne( 'SELECT Id, MonitorId, StartTime FROM Events WHERE Id=?', NULL, array( $event ) );
  }

  global $user;

  if ( !$mid )
    $mid = $event['MonitorId'];

  if ( $user['Events'] == 'Edit' ) {

    dbQuery( 'DELETE FROM Events WHERE Id = ?', array($event['Id']) );
    if ( !ZM_OPT_FAST_DELETE ) {
      dbQuery( 'DELETE FROM Stats WHERE EventId = ?', array($event['Id']) );
      dbQuery( 'DELETE FROM Frames WHERE EventId = ?', array($event['Id']) );
      if ( ZM_USE_DEEP_STORAGE ) {

# Assumption: All events haev a start time
        $start_date = date_parse( $event['StartTime'] );
        $start_date['year'] = $start_date['year'] % 100;

# So this is  because ZM creates a link under teh day pointing to the time that the event happened. 
        $eventlink_path = sprintf('%s/%d/%02d/%02d/%02d/.%d', ZM_DIR_EVENTS, $mid, $start_date['year'], $start_date['month'], $start_date['day'], $event['Id'] );

        if ( $id_files = glob( $eventlink_path ) ) {
# I know we are using arrays here, but really there can only ever be 1 in the array
          $eventPath = preg_replace( '/\.'.$event['Id'].'$/', readlink($id_files[0]), $id_files[0] );
          deletePath( $eventPath );
          deletePath( $id_files[0] );
          $pathParts = explode(  '/', $eventPath );
          for ( $i = count($pathParts)-1; $i >= 2; $i-- ) {
            $deletePath = join( '/', array_slice( $pathParts, 0, $i ) );
            if ( !glob( $deletePath."/*" ) ) {
              deletePath( $deletePath );
            }
          }
        } else {
          Warning( "Found no event files under $eventlink_path" );
        } # end if found files
      } else {
        $eventPath = implode( '/', array( ZM_DIR_EVENTS, $mid, $event['Id'] ) );
        deletePath( $eventPath );
      } # USE_DEEP_STORAGE OR NOT
    } # ! ZM_OPT_FAST_DELETE
  } # CAN EDIT
}

function makeLink( $url, $label, $condition=1, $options="" ) {
  $string = "";
  if ( $condition ) {
    $string .= '<a href="'.$url.'"'.($options?(' '.$options):'').'>';
  }
  $string .= $label;
  if ( $condition ) {
    $string .= '</a>';
  }
  return( $string );
}

function makePopupLink( $url, $winName, $winSize, $label, $condition=1, $options="" ) {
  $string = "";
  if ( $condition ) {
    if ( is_array( $winSize ) )
      $popupParms = "'".$url."', '".$winName."', '".$winSize[0]."', ".$winSize[1].", ".$winSize[2];
    else
      $popupParms = "'".$url."', '".$winName."', '".$winSize."'";

    $string .= '<a href="'.$url.'" onclick="createPopup( '.$popupParms.' ); return( false );"'.($options?(' '.$options):'').'>';
  }
  $string .= $label;
  if ( $condition ) {
    $string .= '</a>';
  }
  return( $string );
}

function makePopupButton( $url, $winName, $winSize, $buttonValue, $condition=1, $options="" ) {
  if ( is_array( $winSize ) )
    $popupParms = "'".$url."', '".$winName."', '".$winSize[0]."', ".$winSize[1].", ".$winSize[2];
  else
    $popupParms = "'".$url."', '".$winName."', '".$winSize."'";
  $string = '<input type="button" value="'.$buttonValue.'" onclick="createPopup( '.$popupParms.' ); return( false );"'.($condition?'':' disabled="disabled"').($options?(' '.$options):'').'/>';
  return( $string );
}

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], $matches ) ) {
      Fatal( "Can't parse selector '$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 {
      $behaviourText = ' onchange="'.$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 ( $columns && !$columns[$key] )
      continue;

    if ( !isset($types[$key]) )
      $types[$key] = false;
    switch( $types[$key] ) {
      case 'set' :
        {
          if ( is_array( $newValues[$key] ) ) {
            if ( join(',',$newValues[$key]) != $values[$key] ) {
              $changes[$key] = "$key = ".dbEscape(join(',',$newValues[$key]));
            }
          } elseif ( $values[$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 ( $values[$key] != $value ) {
            $changes[$key] = "$key = ".dbEscape($value);
          }
          break;
        }
      default :
        {
          if ( !isset($values[$key]) || ($values[$key] != $value) ) {
            $changes[$key] = "$key = ".dbEscape(trim($value));
          }
          break;
        }
    }
  }
  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';
    } elseif ( preg_match( '/Chrome\/([0-9.]+)/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      // Check for old version of Chrome with bug 5876
      if ( $version < 7 ) {
        $browser = 'oldchrome';
      } else {
        $browser = 'chrome';
      }
    } elseif ( preg_match( '/Safari\/([0-9.]+)/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'safari';
    } elseif ( preg_match( '/Opera[ \/]([0-9].[0-9]{1,2})/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'opera';
    } elseif ( preg_match( '/Konqueror\/([0-9.]+)/', $_SERVER['HTTP_USER_AGENT'], $logVersion) ) {
      $version = $logVersion[1];
      $browser = 'konqueror';
    } elseif ( 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 canStreamApplet() {
  if ( (ZM_OPT_CAMBOZOLA && !file_exists( ZM_PATH_WEB.'/'.ZM_PATH_CAMBOZOLA )) ) {
    Warning ( "ZM_OPT_CAMBOZOLA is enabled, but the system cannot find ".ZM_PATH_WEB."/".ZM_PATH_CAMBOZOLA );
  }

  return( (ZM_OPT_CAMBOZOLA && file_exists( ZM_PATH_WEB.'/'.ZM_PATH_CAMBOZOLA )) );
}

function canStream() {
  return( canStreamNative() | canStreamApplet() );
}

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 = ZM_PATH_BIN."/zmdc.pl $command";
  if ( $daemon ) {
    $string .= " $daemon";
    if ( $args ) {
      $string .= " $args";
    }
  }
  $string .= " 2>/dev/null >&- <&- >/dev/null";
  exec( $string );
}

function zmcControl( $monitor, $mode=false ) {
  if ( (!defined('ZM_SERVER_ID')) or ( ZM_SERVER_ID==$monitor['ServerId'] ) ) {
    $row = NULL;
    if ( $monitor['Type'] == "Local" ) {
      $row = dbFetchOne( "select count(if(Function!='None',1,NULL)) as ActiveCount from Monitors where Device = ?", NULL, array($monitor['Device']) );
      $zmcArgs = "-d ".$monitor['Device'];
    } else {
      $row = dbFetchOne( "select count(if(Function!='None',1,NULL)) as ActiveCount from Monitors where Id = ?", NULL, array($monitor['Id']) );
      $zmcArgs = "-m ".$monitor['Id'];
    }
    $activeCount = $row['ActiveCount'];

    if ( !$activeCount || $mode == "stop" ) {
      daemonControl( "stop", "zmc", $zmcArgs );
    } else {
      if ( $mode == "restart" ) {
        daemonControl( "stop", "zmc", $zmcArgs );
      }
      daemonControl( "start", "zmc", $zmcArgs );
    }
  }
}

function zmaControl( $monitor, $mode=false ) {
  if ( !is_array( $monitor ) ) {
    $monitor = dbFetchOne( "select C.*, M.* from Monitors as M left join Controls as C on (M.ControlId = C.Id ) where M.Id=?", NULL, array($monitor) );
  }
  if ( (!defined('ZM_SERVER_ID')) or ( ZM_SERVER_ID==$monitor['ServerId'] ) ) {
    if ( !$monitor || $monitor['Function'] == 'None' || $monitor['Function'] == 'Monitor' || $mode == "stop" ) {
      if ( ZM_OPT_CONTROL ) {
        daemonControl( "stop", "zmtrack.pl", "-m ".$monitor['Id'] );
      }
      daemonControl( "stop", "zma", "-m ".$monitor['Id'] );
      if ( ZM_OPT_FRAME_SERVER ) {
        daemonControl( "stop", "zmf", "-m ".$monitor['Id'] );
      }
    } else {
      if ( $mode == "restart" ) {
        if ( ZM_OPT_CONTROL ) {
          daemonControl( "stop", "zmtrack.pl", "-m ".$monitor['Id'] );
        }
        daemonControl( "stop", "zma", "-m ".$monitor['Id'] );
        if ( ZM_OPT_FRAME_SERVER ) {
          daemonControl( "stop", "zmf", "-m ".$monitor['Id'] );
        }
      }
      if ( ZM_OPT_FRAME_SERVER ) {
        daemonControl( "start", "zmf", "-m ".$monitor['Id'] );
      }
      daemonControl( "start", "zma", "-m ".$monitor['Id'] );
      if ( ZM_OPT_CONTROL && $monitor['Controllable'] && $monitor['TrackMotion'] && ( $monitor['Function'] == 'Modect' || $monitor['Function'] == 'Mocord' ) ) {
        daemonControl( "start", "zmtrack.pl", "-m ".$monitor['Id'] );
      }
      if ( $mode == "reload" ) {
        daemonControl( "reload", "zma", "-m ".$monitor['Id'] );
      }
    }
  } // end if we are on the recording server
}

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 )
    $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 zmaStatus( $monitor ) {
  if ( is_array( $monitor ) ) {
    $monitor = $monitor['Id'];
  }
  return( daemonStatus( "zma", "-m $monitor" ) );
}

function daemonCheck( $daemon=false, $args=false ) {
  $string = ZM_PATH_BIN."/zmdc.pl check";
  if ( $daemon ) {
    $string .= " $daemon";
    if ( $args )
      $string .= " $args";
  }
  $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 zmaCheck( $monitor ) {
  if ( is_array( $monitor ) ) {
    $monitor = $monitor['Id'];
  }
  return( daemonCheck( "zma", "-m $monitor" ) );
}

function getImageSrc( $event, $frame, $scale=SCALE_BASE, $captureOnly=false, $overwrite=false ) {
  $eventPath = getEventPath( $event );

  if ( !is_array($frame) )
    $frame = array( 'FrameId'=>$frame, 'Type'=>'' );

  //echo "S:$scale, CO:$captureOnly<br>";
  $captImage = sprintf( "%0".ZM_EVENT_IMAGE_DIGITS."d-capture.jpg", $frame['FrameId'] );
  $captPath = $eventPath.'/'.$captImage;
  $thumbCaptPath = ZM_DIR_IMAGES.'/'.$event['Id'].'-'.$captImage;
  //echo "CI:$captImage, CP:$captPath, TCP:$thumbCaptPath<br>";

  $analImage = sprintf( "%0".ZM_EVENT_IMAGE_DIGITS."d-analyse.jpg", $frame['FrameId'] );
  $analPath = $eventPath.'/'.$analImage;
  $analFile =  ZM_DIR_EVENTS."/".$analPath;
  $thumbAnalPath = ZM_DIR_IMAGES.'/'.$event['Id'].'-'.$analImage;
  //echo "AI:$analImage, AP:$analPath, TAP:$thumbAnalPath<br>";

  $alarmFrame = $frame['Type']=='Alarm';

  $hasAnalImage = $alarmFrame && file_exists( $analFile ) && filesize( $analFile );
  $isAnalImage = $hasAnalImage && !$captureOnly;

  if ( !ZM_WEB_SCALE_THUMBS || $scale >= SCALE_BASE || !function_exists( 'imagecreatefromjpeg' ) ) {
    $imagePath = $thumbPath = $isAnalImage?$analPath:$captPath;
    $imageFile = ZM_DIR_EVENTS."/".$imagePath;
    $thumbFile = ZM_DIR_EVENTS."/".$thumbPath;
  } else {
    if ( version_compare( phpversion(), "4.3.10", ">=") )
      $fraction = sprintf( "%.3F", $scale/SCALE_BASE );
    else
      $fraction = sprintf( "%.3f", $scale/SCALE_BASE );
    $scale = (int)round( $scale );

    $thumbCaptPath = preg_replace( "/\.jpg$/", "-$scale.jpg", $thumbCaptPath );
    $thumbAnalPath = preg_replace( "/\.jpg$/", "-$scale.jpg", $thumbAnalPath );

    if ( $isAnalImage ) {
      $imagePath = $analPath;
      $thumbPath = $thumbAnalPath;
    } else {
      $imagePath = $captPath;
      $thumbPath = $thumbCaptPath;
    }

    $imageFile = ZM_DIR_EVENTS."/".$imagePath;
    //$thumbFile = ZM_DIR_EVENTS."/".$thumbPath;
    $thumbFile = $thumbPath;
    if ( $overwrite || !file_exists( $thumbFile ) || !filesize( $thumbFile ) ) {
      // Get new dimensions
      list( $imageWidth, $imageHeight ) = getimagesize( $imageFile );
      $thumbWidth = $imageWidth * $fraction;
      $thumbHeight = $imageHeight * $fraction;

      // Resample
      $thumbImage = imagecreatetruecolor( $thumbWidth, $thumbHeight );
      $image = imagecreatefromjpeg( $imageFile );
      imagecopyresampled( $thumbImage, $image, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $imageWidth, $imageHeight );

      if ( !imagejpeg( $thumbImage, $thumbFile ) )
        Error( "Can't create thumbnail '$thumbPath'" );
    }
  }

  $imageData = array(
      'eventPath' => $eventPath,
      'imagePath' => $imagePath,
      'thumbPath' => $thumbPath,
      'imageFile' => $imageFile,
      'thumbFile' => $thumbFile,
      'imageClass' => $alarmFrame?"alarm":"normal",
      'isAnalImage' => $isAnalImage,
      'hasAnalImage' => $hasAnalImage,
      );

  //echo "IP:$imagePath<br>";
  //echo "TP:$thumbPath<br>";
  return( $imageData );
}

function viewImagePath( $path, $querySep='&amp;' ) {
  if ( strncmp( $path, ZM_DIR_IMAGES, strlen(ZM_DIR_IMAGES) ) == 0 ) {
    // Thumbnails
    return( $path );
  } elseif ( strpos( ZM_DIR_EVENTS, '/' ) === 0 ) {
    return( '?view=image'.$querySep.'path='.$path );
  }
  return( ZM_DIR_EVENTS.'/'.$path );
}

function createListThumbnail( $event, $overwrite=false ) {
  if ( !($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 {
    Fatal( "No thumbnail width or height specified, please check in Options->Web" );
  }

  $imageData = getImageSrc( $event, $frame, $scale, false, $overwrite );
  $thumbData = $frame;
  $thumbData['Path'] = $imageData['thumbPath'];
  $thumbData['Width'] = (int)$thumbWidth;
  $thumbData['Height'] = (int)$thumbHeight;

  return( $thumbData );
}

function createVideo( $event, $format, $rate, $scale, $overwrite=false ) {
  $command = ZM_PATH_BIN."/zmvideo.pl -e ".$event['Id']." -f ".$format." -r ".sprintf( "%.2F", ($rate/RATE_BASE) );
  if ( preg_match( '/\d+x\d+/', $scale ) )
    $command .= " -S ".$scale;
  else
    if ( version_compare( phpversion(), "4.3.10", ">=") )
      $command .= " -s ".sprintf( "%.2F", ($scale/SCALE_BASE) );
    else
      $command .= " -s ".sprintf( "%.2f", ($scale/SCALE_BASE) );
  if ( $overwrite )
    $command .= " -o";
  $result = exec( escapeshellcmd( $command ), $output, $status );
  return( $status?"":rtrim($result) );
}

function executeFilter( $filter ) {
  $command = ZM_PATH_BIN."/zmfilter.pl --filter ".escapeshellarg($filter);
  $result = exec( $command, $output, $status );
  dbQuery( "delete from Filters where Name like '_TempFilter%'" );
  return( $status );
}

# 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 != 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 $user;
  if ( !empty($user['MonitorIds']) )
    $midSql = " and MonitorId in (".join( ",", preg_split( '/["\'\s]*,["\'\s]*/', $user['MonitorIds'] ) ).")";
  else
    $midSql = '';
  return( $midSql );
}

function parseSort( $saveToSession=false, $querySep='&amp;' ) {
  global $sortQuery, $sortColumn, $sortOrder; // Outputs

  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' :
      $_REQUEST['sort_field'] = 'StartTime';
    case 'StartTime' :
      $sortColumn = "E.StartTime";
      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;
    default:
      $sortColumn = "E.StartTime";
      break;
  }
  $sortOrder = $_REQUEST['sort_asc']?"asc":"desc";
  if ( !$_REQUEST['sort_asc'] )
    $_REQUEST['sort_asc'] = 0;
  $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']);
  }
}

function parseFilter( &$filter, $saveToSession=false, $querySep='&amp;' ) {
  $filter['query'] = ''; 
  $filter['sql'] = '';
  $filter['fields'] = '';

  if ( isset($filter['terms']) && count($filter['terms']) ) {
    for ( $i = 0; $i < count($filter['terms']); $i++ ) {
      if ( isset($filter['terms'][$i]['cnj']) ) {
        $filter['query'] .= $querySep."filter[terms][$i][cnj]=".urlencode($filter['terms'][$i]['cnj']);
        $filter['sql'] .= " ".$filter['terms'][$i]['cnj']." ";
        $filter['fields'] .= "<input type=\"hidden\" name=\"filter[terms][$i][cnj]\" value=\"".htmlspecialchars($filter['terms'][$i]['cnj'])."\"/>\n";
      }
      if ( isset($filter['terms'][$i]['obr']) ) {
        $filter['query'] .= $querySep."filter[terms][$i][obr]=".urlencode($filter['terms'][$i]['obr']);
        $filter['sql'] .= " ".str_repeat( "(", $filter['terms'][$i]['obr'] )." ";
        $filter['fields'] .= "<input type=\"hidden\" name=\"filter[terms][$i][obr]\" value=\"".htmlspecialchars($filter['terms'][$i]['obr'])."\"/>\n";
      }
      if ( isset($filter['terms'][$i]['attr']) ) {
        $filter['query'] .= $querySep."filter[terms][$i][attr]=".urlencode($filter['terms'][$i]['attr']);
        $filter['fields'] .= "<input type=\"hidden\" name=\"filter[terms][$i][attr]\" value=\"".htmlspecialchars($filter['terms'][$i]['attr'])."\"/>\n";
        switch ( $filter['terms'][$i]['attr'] ) {
          case 'MonitorName':
            $filter['sql'] .= 'M.'.preg_replace( '/^Monitor/', '', $filter['terms'][$i]['attr'] );
            break;
          case 'DateTime':
            $filter['sql'] .= "E.StartTime";
            break;
          case 'Date':
            $filter['sql'] .= "to_days( E.StartTime )";
            break;
          case 'Time':
            $filter['sql'] .= "extract( hour_second from E.StartTime )";
            break;
          case 'Weekday':
            $filter['sql'] .= "weekday( E.StartTime )";
            break;
          case 'Id':
          case 'Name':
          case 'MonitorId':
          case 'Length':
          case 'Frames':
          case 'AlarmFrames':
          case 'TotScore':
          case 'AvgScore':
          case 'MaxScore':
          case 'Cause':
          case 'Notes':
          case 'Archived':
            $filter['sql'] .= 'E.'.$filter['terms'][$i]['attr'];
            break;
          case 'DiskPercent':
            $filter['sql'] .= getDiskPercent();
            break;
          case 'DiskBlocks':
            $filter['sql'] .= getDiskBlocks();
            break;
          case 'SystemLoad':
            $filter['sql'] .= getLoad();
            break;
        }
        $valueList = array();
        foreach ( preg_split( '/["\'\s]*?,["\'\s]*?/', preg_replace( '/^["\']+?(.+)["\']+?$/', '$1', $filter['terms'][$i]['val'] ) ) as $value ) {
          switch ( $filter['terms'][$i]['attr'] ) {
            case 'MonitorName':
            case 'Name':
            case 'Cause':
            case 'Notes':
              $value = dbEscape($value);
              break;
            case 'DateTime':
              $value = "'".strftime( STRF_FMT_DATETIME_DB, strtotime( $value ) )."'";
              break;
            case 'Date':
              $value = "to_days( '".strftime( STRF_FMT_DATETIME_DB, strtotime( $value ) )."' )";
              break;
            case 'Time':
              $value = "extract( hour_second from '".strftime( STRF_FMT_DATETIME_DB, strtotime( $value ) )."' )";
              break;
            default :
              $value = dbEscape($value);
              break;
          }
          $valueList[] = $value;
        }

        switch ( $filter['terms'][$i]['op'] ) {
          case '=' :
          case '!=' :
          case '>=' :
          case '>' :
          case '<' :
          case '<=' :
            $filter['sql'] .= " ".$filter['terms'][$i]['op']." $value";
            break;
          case '=~' :
            $filter['sql'] .= " regexp ".$value;
            break;
          case '!~' :
            $filter['sql'] .= " not regexp ".$value;
            break;
          case '=[]' :
            $filter['sql'] .= " in (".join( ",", $valueList ).")";
            break;
          case '![]' :
            $filter['sql'] .= " not in (".join( ",", $valueList ).")";
            break;
        }

        $filter['query'] .= $querySep."filter[terms][$i][op]=".urlencode($filter['terms'][$i]['op']);
        $filter['fields'] .= "<input type=\"hidden\" name=\"filter[terms][$i][op]\" value=\"".htmlspecialchars($filter['terms'][$i]['op'])."\"/>\n";
        $filter['query'] .= $querySep."filter[terms][$i][val]=".urlencode($filter['terms'][$i]['val']);
        $filter['fields'] .= "<input type=\"hidden\" name=\"filter[terms][$i][val]\" value=\"".htmlspecialchars($filter['terms'][$i]['val'])."\"/>\n";
      }
      if ( isset($filter['terms'][$i]['cbr']) ) {
        $filter['query'] .= $querySep."filter[terms][$i][cbr]=".urlencode($filter['terms'][$i]['cbr']);
        $filter['sql'] .= " ".str_repeat( ")", $filter['terms'][$i]['cbr'] )." ";
        $filter['fields'] .= "<input type=\"hidden\" name=\"filter[terms][$i][cbr]\" value=\"".htmlspecialchars($filter['terms'][$i]['cbr'])."\"/>\n";
      }
    }
    if ( $filter['sql'] )
      $filter['sql'] = " and ( ".$filter['sql']." )";
    if ( $saveToSession ) {
      $_SESSION['filter'] = $filter;
    }
  }
}

function addFilterTerm( $filter, $position, $term=false ) {
  if ( $position < 0 )
    $position = 0;
  elseif( $position > count($filter['terms']) )
    $position = count($filter['terms']);
  if ( $term && $position == 0 )
    unset( $term['cnj'] );
  array_splice( $filter['terms'], $position, 0, array( $term?$term:array() ) );

  return( $filter );
}

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

      }
      $pageText .= '-&nbsp;'.$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>';
        }
      }
    }
  }
  return( $pageText );
}

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

function sortTag( $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() {
  $total = disk_total_space(ZM_DIR_EVENTS);
  if ( ! $total ) {
    Error("disk_total_space returned false for " . ZM_DIR_EVENTS );
    return 0;
  }
  $free = disk_free_space(ZM_DIR_EVENTS);
  if ( ! $free ) {
    Error("disk_free_space returned false for " . ZM_DIR_EVENTS );
  }
  $space = round(($total - $free) / $total * 100);
  return( $space );
}

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

// 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*$area))));
  printf( "X:%cx, Y:$cy<br>" );
  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 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";
    foreach( dbFetchAll( $sql ) as $monitor ) {
      $mITN_monitors[$monitor['Id']] = $monitor;
    }
  }
  $names = array();
  foreach ( preg_split( '/\s*,\s*/', $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 ( $socket < 0 ) {
      Fatal( "socket_create() failed: ".socket_strerror($socket) );
    }
    $sock_file = ZM_PATH_SOCKS.'/zmx10.sock';
    if ( @socket_connect( $socket, $sock_file ) ) {
      $command = "status";
      if ( !socket_write( $socket, $command ) ) {
        Fatal( "Can't write to control socket: ".socket_strerror(socket_last_error($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 ( $socket < 0 ) {
    Fatal( "socket_create() failed: ".socket_strerror($socket) );
  }
  $sock_file = ZM_PATH_SOCKS.'/zmx10.sock';
  if ( @socket_connect( $socket, $sock_file ) ) {
    $command = "$status;$key";
    if ( !socket_write( $socket, $command ) ) {
      Fatal( "Can't write to control socket: ".socket_strerror(socket_last_error($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(
      Logger::FATAL => array( ZM_LOG_ALERT_FAT_COUNT, ZM_LOG_ALARM_FAT_COUNT ),
      Logger::ERROR => array( ZM_LOG_ALERT_ERR_COUNT, ZM_LOG_ALARM_ERR_COUNT ),
      Logger::WARNING => array( ZM_LOG_ALERT_WAR_COUNT, ZM_LOG_ALARM_WAR_COUNT ),
      );

  $sql = "select Level, count(Level) as LevelCount from Logs where Level < ".Logger::INFO." and TimeKey > unix_timestamp(now() - interval ".ZM_LOG_CHECK_PERIOD." second) group by Level order by Level asc";
  $counts = dbFetchAll( $sql );

  foreach ( $counts as $count ) {
    if ( $count['Level'] <= Logger::PANIC )
      $count['Level'] = Logger::FATAL;
    if ( !($levelCount = $levelCounts[$count['Level']]) ) {
      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 :
        Fatal( "Unable to decode JSON string '$value', maximum stack depth exceeded" );
      case JSON_ERROR_CTRL_CHAR :
        Fatal( "Unable to decode JSON string '$value', unexpected control character found" );
      case JSON_ERROR_STATE_MISMATCH :
        Fatal( "Unable to decode JSON string '$value', invalid or malformed JSON" );
      case JSON_ERROR_SYNTAX :
        Fatal( "Unable to decode JSON string '$value', syntax error" );
      default :
        Fatal( "Unable to decode JSON string '$value', unexpected error ".json_last_error() );
      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 ) {
  Error( $message );
  if ( function_exists( 'ajaxCleanup' ) )
    ajaxCleanup();
  if ( $code == HTTP_STATUS_OK ) {
    $response = array( 'result'=>'Error', 'message'=>$message );
    header( "Content-type: text/plain" );
    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, $result );
  elseif ( !empty($result) )
    $response['message'] = $result;
  header( "Content-type: text/plain" );
  exit( jsonEncode( $response ) );
}

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

function detaintPath( $path ) {
  // Remove any absolute paths, or relative ones that want to go up
  $path = preg_replace( '/\.(?:\.+[\\/][\\/]*)+/', '', $path );
  $path = preg_replace( '/^[\\/]+/', '', $path );
  return( $path );
}

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

// For general strings
function validStr( $input ) {
  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 ) {
  return( strip_tags( addslashes( $input ) ) );
}

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

function getStreamHTML( $monitor, $scale=100 ) {
//FIXME, the width and height of the image need to be scaled.
    if ( ZM_WEB_STREAM_METHOD == 'mpeg' && ZM_MPEG_LIVE_FORMAT ) {
        $streamSrc = $monitor->getStreamSrc( array( "mode=mpeg", "scale=".$scale, "bitrate=".ZM_WEB_VIDEO_BITRATE, "maxfps=".ZM_WEB_VIDEO_MAXFPS, "format=".ZM_MPEG_LIVE_FORMAT ) );
        return getVideoStream( "liveStream", $streamSrc, reScale( $monitor->Width(), $scale ), reScale( $monitor->Height(), $scale ), ZM_MPEG_LIVE_FORMAT, $monitor->Name() );
    } else if ( canStream() ) {
        $streamSrc = $monitor->getStreamSrc( array( 'mode=jpeg', 'scale='.$scale, 'maxfps='.ZM_WEB_VIDEO_MAXFPS, 'buffer='.$monitor->StreamReplayBuffer() ) );
        if ( canStreamNative() ) {
            return getImageStream( "liveStream", $streamSrc, reScale( $monitor->Width(), $scale ), reScale( $monitor->Height(), $scale ), $monitor->Name() );
        } elseif ( canStreamApplet() ) {
            return getHelperStream( "liveStream", $streamSrc, reScale( $monitor->Width(), $scale ), reScale( $monitor->Height(), $scale ), $monitor->Name() );
        }
    } else {
        $streamSrc = $monitor->getStreamSrc( array( 'mode=single', "scale=".$scale ) );
        Info( "The system has fallen back to single jpeg mode for streaming. Consider enabling Cambozola or upgrading the client browser.");
        return getImageStill( "liveStream", $streamSrc, reScale( $monitor->Width(), $scale ), reScale( $monitor->Height(), $scale ), $monitor->Name() );
    }
} // end function getStreamHTML

?>