Add download library

Qii/Library/Download.php

@@ -0,0 +1,98 @@
+<?php
+namespace Qii\Library;
+
+ignore_user_abort(true);
+class Download
+{
+	const VERSION = 1.0;
+	public function __construct()
+	{
+		
+	}
+	/**
+	 * 以字符串的形式下载文件
+	 *
+	 * @param String $fileName 保存的文件名
+	 * @param String $string 下载的内容
+	 */
+	public function downloadByString($fileName, $string)
+	{
+		header('Cache-Control: max-age=2592000');
+		header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
+		header('Cache-Control: no-store, no-cache, must-revalidate');
+		header('Cache-Control: pre-check=0, post-check=0, max-age=0');
+		header("Content-type: application/octet-stream");
+		header("Accept-Length: ".  sizeof($string));
+		$fileName = iconv("UTF-8", "GB2312//TRANSLIT", $fileName);
+		header("Content-Disposition: attachment; filename=". $fileName);
+		echo $string;
+	}
+	/**
+	 * 指定文件路径下载指定文件
+	 *
+	 * @param String $filePath 文件路径
+	 * @param String $fileName 文件名
+	 * @param String $mime 文件类型
+	 * @param String $view 下载/打开文件
+	 */
+	public function download($filePath, $fileName = '', $mime = '', $view = 'download')
+	{
+		//设定不限制时间
+		ignore_user_abort(false);
+		set_time_limit(0);
+		if(file_exists($filePath))
+		{
+			if($fileName == '')
+			{
+				$fileName = basename($filePath);
+			}
+			$file = fopen($filePath, "r"); // 打开文件
+			// 输入文件标签
+			header('Cache-Control: max-age=2592000');
+			header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
+			header('Cache-Control: no-store, no-cache, must-revalidate');
+			header('Cache-Control: pre-check=0, post-check=0, max-age=0');
+			if($mime != '' && $mime != 'unlink')
+			{
+				header("Content-type: {$mime}");
+			}
+			else
+			{
+				header("Content-type: application/octet-stream");
+			}
+			header('Content-Encoding: none');
+			header('Content-Transfer-Encoding: binary');
+			header("Accept-Ranges: bytes");
+			header("Accept-Length: ".  filesize($filePath));
+			$fileName = iconv("UTF-8", "GB2312//TRANSLIT", $fileName);
+			if($view == 'download')
+			{
+				header("Content-Disposition: attachment; filename=". $fileName);
+			}
+			else
+			{
+				header('Content-Disposition: inline;filename="'.$fileName.'"');
+			}
+			//输出固定长度的文件避免文件过大导致无法下载
+			$chunk = 16384;
+			$speed = 1000;
+			//#$speed = 0;
+			$sleep = $speed ? floor(( $chunk / ($speed*1024))*1000000) : 0;
+			do
+			{
+				$buf = fread($file, $chunk);
+				$sent += strlen($buf);
+				echo $buf;
+				ob_flush();
+				flush();
+				usleep($sleep);
+				if(strlen($buf) ==0)
+				{
+					break;
+				}
+			}while(true);
+			fclose($file);
+			exit();
+		}
+	}
+}