Processing file loading, file downloading, and other related functions

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Class http {

/**
* Download an object through http
*
* 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 wocould 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 status information array
*
* @ Var array
*/
Protected static $ _ httpStatus = array (

'20140901' => 'contine ',
'20140901' => 'switching Protocols ',

'20140901' => 'OK ',
'000000' => 'created ',
'20140901' => 'accepted ',
'000000' => 'non-Authoritative information ',
'000000' => 'no content ',
'000000' => 'reset content ',
'000000' => 'partial content ',

'000000' => 'Multiple Choices ',
'20140901' => 'moved Permanently ',
'20140901' => 'found ',
'000000' => 'see Other ',
'20140901' => 'not modified ',
'20140901' => 'use proxy ',
'000000' => '(Unused )',
'20140901' => 'temporary redirect ',

'20140901' => 'bad request ',
'20140901' => 'authorized ',
'000000' => 'payment required ',
'000000' => 'forbidden ',
'20140901' => 'not Found ',
'20140901' => 'method Not allowed ',
'20140901' => 'not accesstable ',
'20140901' => 'proxy Authentication required ',
'20140901' => 'request timeout ',
'20140901' => 'canonicalization ',
'000000' => 'gione ',
'20140901' => 'length required ',
'20140901' => 'precondition failed ',
'000000' => 'request Entity Too Large ',
'20140901' => 'request-URI Too long ',
'20140901' => 'unororted Media type ',
'20140901' => 'requested Range Not satisfiable ',
'20140901' => 'pectation failed ',

'000000' => 'internal Server error ',
'20140901' => 'not implemented ',
'20140901' => 'bad gateway ',
'20140901' => 'service unavailable ',
'20140901' => 'Gateway timeout ',
'20140901' => 'HTTP Version Not Supported ted ',
);

/**
* Set HTTP status information
*
* @ Access public
* @ Param string $ code HTTP status code
* @ Param string $ name HTTP status information
* @ Return string
*/
Public static function httpStatus ($ code, $ text = null ){
// Obtain the http protocol
$ Protocol = isset ($ _ SERVER ['server _ Protocol'])? $ _ SERVER ['server _ Protocol']: 'http/123 ';
$ Text = is_null ($ text )? Self: $ _ httpStatus [$ code]: $ text;
$ Status = "$ protocol $ code $ text ";

Header ($ status );
}
}

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