download.php

This is the script which used on 10minutemail.com for temporary email.

    }    

    /**
     * Static send
     *
     * @see     HTTP_Download::HTTP_Download()
     * @see     HTTP_Download::send()
     * 
     * @static
     * @access  public
     * @return  mixed   Returns true on success or PEAR_Error on failure.
     * @param   array   $params     associative array of parameters
     * @param   bool    $guess      whether HTTP_Download::guessContentType()
     *                               should be called
     */
    function staticSend($params, $guess = false)
    {
        $d = &new HTTP_Download();
        $e = $d->setParams($params);
        if (PEAR::isError($e)) {
            return $e;
        }
        if ($guess) {
            $e = $d->guessContentType();
            if (PEAR::isError($e)) {
                return $e;
            }
        }
        return $d->send();
    }
    
    /**
     * Send a bunch of files or directories as an archive
     * 
     * Example:
     * <code>
     *  require_once 'HTTP/Download.php';
     *  HTTP_Download::sendArchive(
     *      'myArchive.tgz',
     *      '/var/ftp/pub/mike',
     *      HTTP_DOWNLOAD_TGZ,
     *      '',
     *      '/var/ftp/pub'
     *  );
     * </code>
     *
     * @see         Archive_Tar::createModify()
     * @deprecated  use HTTP_Download_Archive::send()
     * @static
     * @access  public
     * @return  mixed   Returns true on success or PEAR_Error on failure.
     * @param   string  $name       name the sent archive should have
     * @param   mixed   $files      files/directories
     * @param   string  $type       archive type
     * @param   string  $add_path   path that should be prepended to the files
     * @param   string  $strip_path path that should be stripped from the files
     */
    function sendArchive(   $name, 
                            $files, 
                            $type       = HTTP_DOWNLOAD_TGZ, 
                            $add_path   = '', 
                            $strip_path = '')
    {
        require_once 'HTTP/Download/Archive.php';
        return HTTP_Download_Archive::send($name, $files, $type, 
            $add_path, $strip_path);
    }
    // }}}
    
    // {{{ protected methods
    /** 
     * Generate ETag
     * 
     * @access  protected
     * @return  string
     */
    function generateETag()
    {
        if (!$this->etag) {
            if ($this->data) {
                $md5 = md5($this->data);
            } else {
                $fst = is_resource($this->handle) ? 
                    fstat($this->handle) : stat($this->file);
                $md5 = md5($fst['mtime'] .'='. $fst['ino'] .'='. $fst['size']);
            }
            $this->etag = '"' . $md5 . '-' . crc32($md5) . '"';
        }
        return $this->etag;
    }
    
    /** 
     * Send multiple chunks
     * 
     * @access  protected
     * @return  mixed   Returns true on success or PEAR_Error on failure.
     * @param   array   $chunks
     */
    function sendChunks($chunks)
    {
        if (count($chunks) == 1) {
            return $this->sendChunk(array_shift($chunks));
        }

        $bound = uniqid('HTTP_DOWNLOAD-', true);
        $cType = $this->headers['Content-Type'];
        $this->headers['Content-Type'] =
            'multipart/byteranges; boundary=' . $bound;
        $this->sendHeaders();
        foreach ($chunks as $chunk){
            if (PEAR::isError($e = $this->sendChunk($chunk, $cType, $bound))) {
                return $e;
            }
        }
        #echo "\r\n--$bound--\r\n";
        return true;
    }
    
    /**
     * Send chunk of data
     * 
     * @access  protected
     * @return  mixed   Returns true on success or PEAR_Error on failure.
     * @param   array   $chunk  start and end offset of the chunk to send
     * @param   string  $cType  actual content type
     * @param   string  $bound  boundary for multipart/byteranges
     */
    function sendChunk($chunk, $cType = null, $bound = null)
    {
        list($offset, $lastbyte) = $chunk;
        $length = ($lastbyte - $offset) + 1;
        
        if ($length < 1) {
            return PEAR::raiseError(
                "Error processing range request: $offset-$lastbyte/$length",
                HTTP_DOWNLOAD_E_INVALID_REQUEST
            );
        }
        
        $range = $offset . '-' . $lastbyte . '/' . $this->size;
        
        if (isset($cType, $bound)) {
            echo    "\r\n--$bound\r\n",
                    "Content-Type: $cType\r\n",
                    "Content-Range: bytes $range\r\n\r\n";
        } else {
            if ($this->isRangeRequest()) {
                $this->headers['Content-Range'] = 'bytes '. $range;
            }
            $this->sendHeaders();
        }

        if ($this->data) {
            while (($length -= $this->bufferSize) > 0) {
                $this->flush(substr($this->data, $offset, $this->bufferSize));
                $this->throttleDelay and $this->sleep();
                $offset += $this->bufferSize;
            }
            if ($length) {
                $this->flush(substr($this->data, $offset, $this->bufferSize + $length));
            }
        } else {
            if (!is_resource($this->handle)) {
                $this->handle = fopen($this->file, 'rb');
            }
            fseek($this->handle, $offset);
            while (($length -= $this->bufferSize) > 0) {
                $this->flush(fread($this->handle, $this->bufferSize));
                $this->throttleDelay and $this->sleep();
            }
            if ($length) {
                $this->flush(fread($this->handle, $this->bufferSize + $length));
            }
        }
        return true;
    }
    
    /** 
     * Get chunks to send
     * 
     * @access  protected
     * @return  array
     */
    function getChunks()
    {
        $parts = array();
        foreach (explode(',', $this->getRanges()) as $chunk){
            list($o, $e) = explode('-', $chunk);
            if ($e >= $this->size || (empty($e) && $e !== 0 && $e !== '0')) {
                $e = $this->size - 1;
            }
            if (empty($o) && $o !== 0 && $o !== '0') {
                $o = $this->size - $e;
                $e = $this->size - 1;
            }
            $parts[] = array($o, $e);
        }
        return $parts;
    }
    
    /** 
     * Check if range is requested
     * 
     * @access  protected
     * @return  bool
     */
    function isRangeRequest()
    {
        if (!isset($_SERVER['HTTP_RANGE'])) {
            return false;
        }
        return $this->isValidRange();
    }
    
    /** 
     * Get range request
     * 
     * @access  protected
     * @return  array
     */
    function getRanges()
    {
        return preg_match('/^bytes=((\d*-\d*,? ?)+)$/', 
            @$_SERVER['HTTP_RANGE'], $matches) ? $matches[1] : array();
    }
    
    /** 
     * Check if entity is cached
     * 
     * @access  protected
     * @return  bool
     */
    function isCached()
    {
        return (
            (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
            $this->lastModified == strtotime(array_shift(explode(
                ';', $_SERVER['HTTP_IF_MODIFIED_SINCE'])))) ||
            (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
            $this->compareAsterisk('HTTP_IF_NONE_MATCH', $this->etag))
        );
    }
    
    /** 
     * Check if entity hasn't changed
     * 
     * @access  protected
     * @return  bool
     */
    function isValidRange()
    {
        if (isset($_SERVER['HTTP_IF_MATCH']) &&
            !$this->compareAsterisk('HTTP_IF_MATCH', $this->etag)) {
            return false;
        }
        if (isset($_SERVER['HTTP_IF_RANGE']) &&
                  $_SERVER['HTTP_IF_RANGE'] !== $this->etag &&
                  strtotime($_SERVER['HTTP_IF_RANGE']) !== $this->lastModified) {
            return false;
        }
        if (isset($_SERVER['HTTP_IF_UNMODIFIED_SINCE'])) {
            $lm = array_shift(explode(';', $_SERVER['HTTP_IF_UNMODIFIED_SINCE']));
            if (strtotime($lm) !== $this->lastModified) {
                return false;
            }
        }
        if (isset($_SERVER['HTTP_UNLESS_MODIFIED_SINCE'])) {
            $lm = array_shift(explode(';', $_SERVER['HTTP_UNLESS_MODIFIED_SINCE']));
            if (strtotime($lm) !== $this->lastModified) {
                return false;
            }
        }
        return true;
    }
    
    /** 
     * Compare against an asterisk or check for equality
     * 
     * @access  protected
     * @return  bool
     * @param   string  key for the $_SERVER array
     * @param   string  string to compare
     */
    function compareAsterisk($svar, $compare)
    {
        foreach (array_map('trim', explode(',', $_SERVER[$svar])) as $request) {
            if ($request === '*' || $request === $compare) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Send HTTP headers
     *
     * @access  protected
     * @return  void
     */
    function sendHeaders()
    {
        foreach ($this->headers as $header => $value) {
            $this->HTTP->setHeader($header, $value);
        }
        $this->HTTP->sendHeaders();
        /* NSAPI won't output anything if we did this */
        if (strncasecmp(PHP_SAPI, 'nsapi', 5)) {
            ob_flush();
            flush();
        }
    }
    
    /**
     * Flush
     * 
     * @access  protected
     * @return  void
     * @param   string  $data
     */
    function flush($data = '')
    {
        echo $data;
        ob_flush();
        flush();
    }
    
    /**
     * Sleep
     * 
     * @access  protected
     * @return  void
     */
    function sleep()
    {
        if (OS_WINDOWS) {
            com_message_pump($this->throttleDelay);
        } else {
            usleep($this->throttleDelay * 1000);
        }
    }
    // }}}
}
?>