<?php
if ($_SERVER["SCRIPT_FILENAME"] == __FILE__) {
	@header('Location: /');
	exit;
}
/* ==============================================================
 *
 * --------------------------------------------------------------
 */
class Download_class {

	private $id = '';
	private $name = '';
	private $ext = '';
	private $father = '';
	private $partes = 0;
	private $ambito = '';
	private $acceso = '';
	private $mimetype = '';
	private $sizereal = 0;
	private $content_binary = '';
	private $errno = 0;
	private $error = '';
	private $mimetype_obj = null;
	private $forced_download = FALSE;
	private $tabla = '';

	// ----------------------------------------------------------
	public function __construct( $file_id, $forced=FALSE ) {
		$this->id = $file_id;
		$this->name = '';
		$this->ext = '';
		$this->father = 0;
		$this->partes = 0;
		$this->ambito = '';
		$this->acceso = '';
		$this->mimetype = '';
		$this->sizereal = 0;
		$this->content_binary = '';
		$this->errno = 0;
		$this->error = '';
		$this->mimetype_obj = new Mimetype_class();
		$this->forced_download = $forced;
		$this->tabla = '';
	}
	// ----------------------------------------------------------
	public function any_error() {
		return ($this->errno != 0);
	}
	// ----------------------------------------------------------
	public function get_errno() {
		return $this->errno;
	}
	// ----------------------------------------------------------
	public function get_error() {
		return $this->error;
	}
	// ----------------------------------------------------------
	private function set_error( $error, $errno = '0' ) {
		$this->errno = ($errno == 0 ? 1 : $errno);
		$this->error = $error;
	}
	// ----------------------------------------------------------
	private function clean_extension( $extension ) {
		return "." . trim(strtolower($extension));
	}
	// ----------------------------------------------------------
	public function download_prepare( ) {
		$this->sql_get_data();

		$this->sql_get_content();
		$result = $this->sql_download_log();

		if ($result == -1) {
			$this->set_error( kMSG_BAD_LOG, -1 );
		}

		if ($this->partes > 1) {
			ini_set('memory_limit', 1024*1024*MAX_SIZE_FILES);

			for ($i=2; $i<=$this->partes; $i++) {
				$this->sql_get_size($i);
			}
		}
	}
	// ----------------------------------------------------------
	public function download( ) {

		/*
		$forzar_descarga = FALSE;
		if (!$this->forced_download) {
			$extension = trim(strtolower($this->ext));
			$valid_ext = array('.pdf', '.txt', '.mp3', '.jpg', '.png', '.gif', '.swf', '.mpeg');
			if (in_array($extension, $valid_ext)) {
				$forzar_descarga = FALSE;
			}
		}
		*/

		// Fuerza los ficheros de tipo a vídeo a ser descargados
		/*
		$ext_videos = array('.swf', '.flv', '.3gp', '.3g2', '.avi', '.mp4', '.asf', '.mov', '.mpg');
		if ( in_array($this->ext, $ext_videos) ) {
			$this->forced_download = TRUE;
		}
		*/

		// Cabeceras
		header( 'Content-type: '.$this->mimetype );

		if ($this->forced_download) {
			header( 'Content-Disposition: attachment; filename="'.$this->name.'"' );
		} else {
			header( 'Content-Disposition: inline; filename="'.$this->name.'"' );
		}

		header( 'Content-Transfer-Encoding: binary' );
		header( 'Content-Length: '.$this->sizereal );

		// Datos del fichero
		echo $this->content_binary;
		if ($this->partes > 1) {
			for ($i=2; $i<=$this->partes; $i++) {
				echo $this->sql_get_parte($i);
			}
		}

	}
	// ----------------------------------------------------------
	// ==========================================================
	// SQL
	// ----------------------------------------------------------
	private function sql_get_data( ) {
		global $db;

		$q_data_SELECT = "NOMBRE, EXTENSION, PADRE, PARTES, AMBITO, ACCESO"
			. " FROM BIBLIOTECA_ELEMENTOS"
			. " WHERE CLAVE = '%s' LIMIT 1";
		$query = sprintf( $q_data_SELECT, $this->id );
		$result = $db->query_select( $query );
		$row = $result->fetch_assoc();
		$this->name = $row["NOMBRE"];
		$this->ext = $this->clean_extension( $row["EXTENSION"] );
		$this->father = $row["PADRE"];
		$this->partes = $row["PARTES"];
		$this->ambito = $row["AMBITO"];
		$this->acceso = $row["ACCESO"];
		$result->close();

		$this->mimetype = $this->mimetype_obj->get_mimetype( $this->ext );
	}
	// ----------------------------------------------------------
	private function sql_get_table_sufix( ) {
		global $db;

		$q_SELECT = "SUFIJO"
			. " FROM BIBLIOTECA_ELEMENTOS"
			. " WHERE CLAVE = '%s'"
			. " AND TIPO='D' LIMIT 1";
		$query = sprintf( $q_SELECT, $this->id );
		$result = $db->query_select( $query );
		$row = $result->fetch_assoc();
		$tablasufijo = 'FICHEROS_' . $row["SUFIJO"];
		$result->close();
		return $tablasufijo;
	}

		// ----------------------------------------------------------
	private function sql_get_content( ) {
		global $db;

		$tablasufijo = $this->sql_get_table_sufix();

		$q_SELECT = "FICHERO, TAMANOREAL"
			. " FROM " . $tablasufijo
			. " WHERE CLAVE = '%s'"
			. " AND PARTE = 1"
			. " AND VERSION = '0' LIMIT 1";
		$query = sprintf( $q_SELECT, $this->id );
		$result = $db->query_select( $query );
		$row = $result->fetch_assoc();
		$this->sizereal = $row["TAMANOREAL"];
		$this->content_binary = $row["FICHERO"];
		$result->close();
	}
	// ----------------------------------------------------------
	private function sql_get_size( $num ) {
		global $db;

		$tablasufijo = $this->sql_get_table_sufix();

		$q_SELECT = "TAMANO"
			. " FROM " . $tablasufijo
			. " WHERE PARTE = '%s'"
			. " AND CLAVE = '%s'"
			. " AND VERSION = '0' LIMIT 1";
		$query = sprintf( $q_SELECT, $num, $this->id );
		$result = $db->query_select( $query );
		$row = $result->fetch_assoc();
		$this->sizereal += $row["TAMANO"];
		$result->close();
	}
	private function sql_get_parte( $num ) {
		global $db;

		$tablasufijo = $this->sql_get_table_sufix();

		$q_SELECT = "FICHERO"
			. " FROM " . $tablasufijo
			. " WHERE PARTE = '%s'"
			. " AND CLAVE = '%s'"
			. " AND VERSION = '0' LIMIT 1";
		$query = sprintf( $q_SELECT, $num, $this->id );
		$result = $db->query_select( $query );
		$row = $result->fetch_assoc();
		return $row["FICHERO"];
		$result->close();
	}
	// ----------------------------------------------------------
	private function sql_download_log( ) {
		global $db, $user;

		$user_id = $user->get_id();
		$user_group = $user->get_group();

		$q_INSERT = "INTO BIBLIOTECA_HISTORIAL ("
			. "CLAVE,USUARIO,FECHA,ACCION,DOCUMENTO,CARPETA,DESTINO,"
			. "ORDENADOR,MENSAJE,AMBITO,ACCESO,TIPO,TAMANO,CREADOR,"
			. "RUTA,DETALLE,CONTROL" . ") VALUES ("
			. "'".$this->id."',"
			. "'".$user_id."',"
			. "NOW(),"
			. " ".kLOG_OPEN.","
			. "'".$this->name."',"
			. "'".$this->father."',"
			. "'',"
			. "'".$user->get_ip()."',"
			. "'',"
			. "'".$this->ambito."',"
			. "'".$this->acceso."',"
			. "'D',"
			. "'".$this->sizereal."',"
			. "'".$user_id."',"
			. "'',"
			. "'',"
			. "0)";
		$query = $q_INSERT;

		if ( debug_on() ) {
			$user->set_session_value('Q_DOWNLOAD_LOG', $query);
		}

		return $db->query_insert($query);
	}
// --------------------------------------------------------------
}
?>