<?php
// Content-disposition: attachmentにするとファイルダウンロードのダイアログが開く(IE6)
// Cache-Controlをpublicにすることによりダウンロードに失敗することを予防できる
// http://support.microsoft.com/default.aspx?scid=kb;ja;436605
// 「Content-Disposition: attachemnt と Cache-Control: no-cache によるダウンロードの問題」も参照

/*
	$disposition: "" or "inline" or "attachment"
*/
function lib_download_file( $fname, $dl_name = "", $mime = "application/octet-stream", $disposition = "attachment" )
{
	if ( ! $dl_name ) {
		$dl_name = $fname;
	}
	$ret = false;

	if ( is_file( $fname ) ) {
		$fsize = filesize( $fname );
		if ( $fsize > 0 && $fp = fopen( $fname, "rb" ) ) {	// "rb" for Windows
			$head = array();
			$head[] = "Cache-Control: public";
			$head[] = "Pragma: public";
			$head[] = "Accept-Ranges: bytes";	// bytes, none
			$head[] = "Content-Length: $fsize";
			if ( $disposition ) {
				$head[] = "Content-disposition: $disposition; filename=$dl_name";
			}
			$head[] = "Connection: close";	// これをつけると応答コードにKeepAliveのパラメータがなくなる
			$head[] = "Content-type: $mime; name=$dl_name";
				while ( list( $idx, $v ) = each( $head ) ) {
				header( $v );
			}
			$out_size = 0;
			while ( !feof( $fp ) ) {
				$contents = fread( $fp, 8192 );
				echo $contents;
			}
			fclose( $fp );
		}
	} else {
		$ret = false;
	}
	return $ret;
}
$phps = array(
	"dispip",
	"createqr",
	"id2md5",
	"create_password",
	"src",
	"rand_order",
);
$zips = array(
	"qrcode",
);
$php = @$_REQUEST[ "n" ];
$zip = @$_REQUEST[ "z" ];
if ( in_array( $php, $phps ) ) {
	$fname = $php.".php";
	$mime = "text/plain";
} else {
	if ( in_array( $zip, $zips ) ) {
		$fname = $zip.".zip";
		$mime = "application/zip";
	} else {
		echo "input fname";
		exit;
	}
}
lib_download_file( $fname, $fname, $mime );
?>