处理文件加载. 文件下载等相关功能

处理文件加载. 文件下载等相关功能

class http {

/**
* http下载文件
*
* Reads a file and send a header to force download it.
* @copyright www.doophp.com
* @param string $file_str File name with absolute path to it
* @param bool $isLarge If True, the large file will be read chunk by chunk into the memory.
* @param string $rename Name to replace the file name that would be downloaded
*/
public static function download($file, $isLarge = false, $rename = NULL){

if(headers_sent())return false;

if(!$file) {
exit('Error 404:The file not found!');
}

if($rename==NULL){
if(strpos($file, '/')===false && strpos($file, '\\')===false)
$filename = $file;
else{
$filename = basename($file);
}
}else{
$filename = $rename;
}

header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header("Content-Disposition: attachment; filename=\"$filename\"");
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();

if($isLarge)
self::readfileChunked($file);
else
readfile($file);
}

/**
* Read a file and display its content chunk by chunk
*
* @param string $filename
* @param bool $retbytes
* @return mixed
*/
private function readfileChunked($filename, $retbytes = true, $chunkSize = 1024) {

$buffer = '';
$cnt =0;

$handle = fopen($filename, 'rb');
if ($handle === false) {
return false;
}
while (!feof($handle)) {
$buffer = fread($handle, $chunkSize);
echo $buffer;
ob_flush();
flush();
if ($retbytes) {
$cnt += strlen($buffer);
}
}
$status = fclose($handle);
if ($retbytes && $status) {
return $cnt; // return num. bytes delivered like readfile() does.
}

return $status;
}

/**
* HTTP状态信息数组
*
* @var array
*/
protected static $_httpStatus = array(

'100' => 'Continue',
'101' => 'Switching Protocols',

'200' => 'OK',
'201' => 'Created',
'202' => 'Accepted',
'203' => 'Non-Authoritative Information',
'204' => 'No Content',
'205' => 'Reset Content',
'206' => 'Partial Content',

'300' => 'Multiple Choices',
'301' => 'Moved Permanently',
'302' => 'Found',
'303' => 'See Other',
'304' => 'Not Modified',
'305' => 'Use Proxy',
'306' => '(Unused)',
'307' => 'Temporary Redirect',

'400' => 'Bad Request',
'401' => 'Unauthorized',
'402' => 'Payment Required',
'403' => 'Forbidden',
'404' => 'Not Found',
'405' => 'Method Not Allowed',
'406' => 'Not Acceptable',
'407' => 'Proxy Authentication Required',
'408' => 'Request Timeout',
'409' => 'Conflict',
'410' => 'Gone',
'411' => 'Length Required',
'412' => 'Precondition Failed',
'413' => 'Request Entity Too Large',
'414' => 'Request-URI Too Long',
'415' => 'Unsupported Media Type',
'416' => 'Requested Range Not Satisfiable',
'417' => 'Expectation Failed',

'500' => 'Internal Server Error',
'501' => 'Not Implemented',
'502' => 'Bad Gateway',
'503' => 'Service Unavailable',
'504' => 'Gateway Timeout',
'505' => 'HTTP Version Not Supported',
);

/**
* 设置HTTP状态信息
*
* @access public
* @param string $code HTTP 状态编码
* @param string $name HTTP 状态信息
* @return string
*/
public static function httpStatus($code, $text = null) {
//获取http协议
$protocol = isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1';
$text = is_null($text) ? self::$_httpStatus[$code] : $text;
$status = "$protocol $code $text";

header($status);
}
}

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