<?php
namespace app\components;
class ZipFile {
    var $datasec = array ();
    var $ctrl_dir = array ();
    var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
    var $old_offset = 0;

    function unix2_dostime($unixtime = 0){
        $timearray = ($unixtime == 0) ? getdate () : getdate($unixtime);
        if ($timearray ['year'] < 1980){
            $timearray ['year'] = 1980;
            $timearray ['mon'] = 1;
            $timearray ['mday'] = 1;
            $timearray ['hours'] = 0;
            $timearray ['minutes'] = 0;
            $timearray ['seconds'] = 0;
        }
        return (($timearray ['year'] - 1980) << 25) | ($timearray ['mon'] << 21) | ($timearray ['mday'] << 16) | ($timearray ['hours'] << 11) | ($timearray ['minutes'] << 5) | ($timearray ['seconds'] >> 1);
    }
    function add_file($data, $name, $time = 0){
        $name = str_replace('\\', '/', $name);

        $dtime = dechex($this->unix2_dostime($time));
        $hexdtime = '\x' . $dtime [6] . $dtime [7] . '\x' . $dtime [4] . $dtime [5] . '\x' . $dtime [2] . $dtime [3] . '\x' . $dtime [0] . $dtime [1];
        eval('$hexdtime = "' . $hexdtime . '";');

        $fr = "\x50\x4b\x03\x04";
        $fr .= "\x14\x00";
        $fr .= "\x00\x00";
        $fr .= "\x08\x00";
        $fr .= $hexdtime;

        $unc_len = strlen($data);
        $crc = crc32($data);
        $zdata = gzcompress($data);
        $zdata = substr(substr($zdata, 0, strlen($zdata)- 4), 2);
        $c_len = strlen($zdata);
        $fr .= pack('V', $crc);
        $fr .= pack('V', $c_len);
        $fr .= pack('V', $unc_len);
        $fr .= pack('v', strlen($name));
        $fr .= pack('v', 0);
        $fr .= $name;

        $fr .= $zdata;
        $fr .= pack('V', $crc);
        $fr .= pack('V', $c_len);
        $fr .= pack('V', $unc_len);

        $this->datasec [] = $fr;

        $cdrec = "\x50\x4b\x01\x02";
        $cdrec .= "\x00\x00";
        $cdrec .= "\x14\x00";
        $cdrec .= "\x00\x00";
        $cdrec .= "\x08\x00";
        $cdrec .= $hexdtime;
        $cdrec .= pack('V', $crc);
        $cdrec .= pack('V', $c_len);
        $cdrec .= pack('V', $unc_len);
        $cdrec .= pack('v', strlen($name));
        $cdrec .= pack('v', 0);
        $cdrec .= pack('v', 0);
        $cdrec .= pack('v', 0);
        $cdrec .= pack('v', 0);
        $cdrec .= pack('V', 32);

        $cdrec .= pack('V', $this->old_offset);
        $this->old_offset += strlen($fr);

        $cdrec .= $name;

        $this->ctrl_dir[] = $cdrec;
    }
    function add_path($path, $l = 0){
        $d = @opendir($path);
        $l = $l > 0 ? $l : strlen($path) + 1;
        while($v = @readdir($d)){
            if($v == '.' || $v == '..'){
                continue;
            }
            $v = $path . '/' . $v;
            if(is_dir($v)){
                $this->add_path($v, $l);
            } else {
                $this->add_file(file_get_contents($v), substr($v, $l));
            }
        }
    }
    function file(){
        $data = implode('', $this->datasec);
        $ctrldir = implode('', $this->ctrl_dir);
        return $data . $ctrldir . $this->eof_ctrl_dir . pack('v', sizeof($this->ctrl_dir)) . pack('v', sizeof($this->ctrl_dir)) . pack('V', strlen($ctrldir)) . pack('V', strlen($data)) . "\x00\x00";
    }

    function add_files($files){
        foreach($files as $file){
            if (is_file($file)){
                $data = implode("", file($file));
                $this->add_file($data, $file);
            }
        }
    }
    function output($file){
        $fp = fopen($file, "w");
        fwrite($fp, $this->file ());
        fclose($fp);
    }

    /**
     * @param $zipName string 文件名称
     * @param $tmpDir string 保存ZIP目录
     * @param $picAllArr array 内容
     * @return string|void
     */
    function downloadZipImg($zipName,$tmpDir,$picAllArr)
    {
        $zipNameUrl = $tmpDir . $zipName; // 文件路径
        // 生成文件
        $zip = new \ZipArchive();
        if ($zip->open($zipNameUrl, \ZipArchive::OVERWRITE) !== true) {
            //OVERWRITE 参数会覆写压缩包的文件 文件必须已经存在
            if ($zip->open($zipNameUrl,\ZipArchive::CREATE) !== true) {
                // 文件不存在则生成一个新的文件 用CREATE打开文件会追加内容至zip
                return  '下载失败，文件夹不存在';
            }
        }

        foreach ($picAllArr as $index => $file) {
            //抓取图片内容
            $fileContent = file_get_contents($file['path']);
            //添加图片
            $zip->addFromString($file['name'], $fileContent);
        }
        // 关闭
        $zip->close();

        //没有文件
        if (!file_exists($zipNameUrl)) {
            return '下载失败，图片不存在或无法下载';
        }

        header("Cache-Control: public");
        header("Content-Description: File Transfer");
        header('Content-disposition: attachment; filename=' . $zipName); //文件名
        header("Content-Type: application/zip"); //zip格式的
        header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件
        header('Content-Length: ' . filesize($zipNameUrl)); //告诉浏览器，文件大小

        // 下面2步必须要
        ob_clean();
        flush();

        @readfile($zipNameUrl);
        unlink($zipNameUrl); // 删除文件
        exit;
    }
}