f (!empty($uidarr)) {
        $uids = array();
        $update = array();
        foreach ($uidarr as $_uid => $n) {
            $uids[] = $_uid;
            $update[$_uid] = array('articles-' => $n);
            'mysql' != $conf['cache']['type'] and cache_delete('user-' . $_uid);
            
        }

        

        user_big_update(array('uid' => $uids), $update);
    }

    

    !empty($operate_create) && function_exists('operate_big_insert') and operate_big_insert($operate_create);

    

    return TRUE;
}

// 大数据量容易超时 删除用户时使用，删除主题 回复 栏目统计 附件 全站统计
function well_thread_delete_all_by_uid($uid)
{
    

    // 用户主题数
    $user = user_read_cache($uid);

    

    set_time_limit(0);

    // 删除所有回复
    if ($user['comments']) {
        $postist = comment_pid_find_by_uid($uid, 1, $user['comments'], FALSE);

        $pidarr = array();
        foreach ($postist as $val) {
            $pidarr[] = $val['pid'];
        }
        unset($postist);

        !empty($pidarr) and comment_delete_by_pids($pidarr);
    }

    

    if ($user['articles']) {
        // 如果主题、附件和回复数量太大会超时
        $tidlist = thread_tid_find_by_uid($uid, 1, $user['articles'], FALSE, 'tid', array('tid'));

        $tidarr = array();
        foreach ($tidlist as $val) {
            $tidarr[] = $val['tid'];
        }
        unset($tidlist);

        !empty($tidarr) and well_thread_delete_all($tidarr);
    }

    

    return TRUE;
}

// 搜索标题
function well_thread_find_by_keyword($keyword, $d = NULL)
{
    if (empty($keyword)) return NULL;

    

    $db = $_SERVER['db'];
    $d = $d ? $d : $db;
    if (!$d) return FALSE;

    

    $threadlist = db_sql_find("SELECT * FROM `{$d->tablepre}website_thread` WHERE subject LIKE '%$keyword%' LIMIT 60;", 'tid', $d);

    

    if ($threadlist) {
        $threadlist = arrlist_multisort($threadlist, 'tid', FALSE);

        
        foreach ($threadlist as &$thread) {
            well_thread_format($thread);
            // 关键词标色
            //$thread['subject'] = comment_highlight_keyword($thread['subject'], $keyword);
        }
    }

    

    return $threadlist;
}

// 查找 最后评论 lastpid
function well_thread_find_lastpid($tid)
{
    $arr = comment_pid_read(array('tid' => $tid), array('pid' => -1), array('pid'));
    $lastpid = empty($arr) ? 0 : $arr['pid'];
    return $lastpid;
}

// 更新最后的 uid
function well_thread_update_last($tid)
{
    if (empty($tid)) return FALSE;

    $lastpid = well_thread_find_lastpid($tid);
    if (empty($lastpid)) return FALSE;

    $lastpost = comment_read($lastpid);
    if (empty($lastpost)) return FALSE;

    $r = well_thread_update($tid, array('lastuid' => $lastpost['uid']));

    return $r;
}

function well_thread_maxid()
{
    
    $n = db_maxid('website_thread', 'tid');
    
    return $n;
}

// 主题状态 0:通过 1~9 审核:1待审核 10~19:10退稿 11逻辑删除
function well_thread_format(&$thread)
{
    global $gid, $uid, $forumlist;
    $conf = _SERVER('conf');
    if (empty($thread)) return;
    

    $thread['create_date_fmt'] = humandate($thread['create_date']);
    $thread['last_date_fmt'] = humandate($thread['last_date']);
    $thread['create_date_fmt_ymd'] = date('Y-m-d', $thread['create_date']);
    $thread['last_date_fmt_ymd'] = date('Y-m-d', $thread['last_date']);

    $user = user_read_cache($thread['uid']);

    $onlinelist = online_user_list_cache();
    $user['online_status'] = isset($onlinelist[$user['uid']]) ? 1 : 0;
    $thread['username'] = $user['username'];
    $thread['user_avatar_url'] = array_value($user, 'avatar_url');
    $thread['user'] = user_safe_info($user);
    unset($user);
    
    $forum = array_value($forumlist, $thread['fid']);
    $thread['forum_name'] = array_value($forum, 'name');
    $thread['forum_url'] = array_value($forum, 'url');

    if ($thread['last_date'] == $thread['create_date']) {
        $thread['last_date_fmt'] = '';
        $thread['lastuid'] = 0;
        $thread['lastusername'] = '';
    } else {
        $lastuser = $thread['lastuid'] ? user_read_cache($thread['lastuid']) : array();
        $thread['lastusername'] = $thread['lastuid'] ? $lastuser['username'] : lang('guest');
        $thread['lastuser'] = $thread['lastuid'] ? user_safe_info($lastuser) : array();
        
        unset($lastuser);
    }

    $thread['url'] = url('read-' . $thread['tid'], '', FALSE);
    
if ($conf['url_rewrite_on'] > 1) {
    !empty($forum['well_alias']) and $thread['url'] = url(urlencode($forum['well_alias'])."-$thread[create_date]a$thread[tid]", '', FALSE);
    
} else { 
    $thread['url'] = url("read-$thread[create_date]a$thread[tid]", '', FALSE);
}

    $thread['user_url'] = url('user-' . $thread['uid']);

    $thread['sticky_class'] = '';
    if ($thread['sticky'] > 0) {
        if (1 == $thread['sticky']) {
            $thread['sticky_class'] = 'success';
        } elseif (2 == $thread['sticky']) {
            $thread['sticky_class'] = 'warning';
        } elseif (3 == $thread['sticky']) {
            $thread['sticky_class'] = 'danger';
        }
    }

    $nopic = view_path() . 'img/nopic.png';

    if ($thread['icon']) {

        $attach_dir_save_rule = array_value($conf, 'attach_dir_save_rule', 'Ym');
        $day = date($attach_dir_save_rule, $thread['icon']);

        $thread_format_icon_default = 1;

        

        if (1 == $thread_format_icon_default) {
            // 本地文件绝对路径
            $destfile = $conf['upload_path'] . 'thumbnail/' . $day . '/' . $thread['uid'] . '_' . $thread['tid'] . '_' . $thread['icon'] . '.jpeg';

            // 本地
            $thread['icon_fmt'] = is_file($destfile) ? file_path($thread['attach_on']) . 'thumbnail/' . $day . '/' . $thread['uid'] . '_' . $thread['tid'] . '_' . $thread['icon'] . '.jpeg' : $nopic;

            if (1 == $conf['attach_on'] && 1 == $thread['attach_on']) {

                // 云储存
                $thread['icon_fmt'] = file_path($thread['attach_on']) . 'thumbnail/' . $day . '/' . $thread['uid'] . '_' . $thread['tid'] . '_' . $thread['icon'] . '.jpeg';

            } elseif (2 == $conf['attach_on'] && 2 == $thread['attach_on']) {
                // 图床 未上传成功 本地图片在的话使用本地，不在则默认
                $thread['icon_fmt'] = $thread['image_url'] ? $thread['image_url'] : $thread['icon_fmt'];
            }
        }

    } else {
        $thread['icon_fmt'] = $nopic;
    }

    

    // 回复页面
    $thread['pages'] = ceil($thread['posts'] / $conf['comment_pagesize']);

    $thread['tag_fmt'] = $thread['tag'] ? xn_json_decode($thread['tag']) : '';
    
    // 权限判断
    $thread['allowupdate'] = ($uid == $thread['uid']) || forum_access_mod($thread['fid'], $gid, 'allowupdate');
    $thread['allowdelete'] = (group_access($gid, 'allowuserdelete') and $uid == $thread['uid']) || forum_access_mod($thread['fid'], $gid, 'allowdelete');
    $thread['allowtop'] = forum_access_mod($thread['fid'], $gid, 'allowtop');

    

    $thread = well_thread_safe_info($thread);
}

function well_thread_format_last_date(&$thread)
{
    
    if ($thread['last_date'] != $thread['create_date']) {
        $thread['last_date_fmt'] = humandate($thread['last_date']);
    } else {
        $thread['create_date_fmt'] = humandate($thread['create_date']);
    }
    
}

// 对 $threadlist 权限过滤
function well_thread_list_access_filter(&$threadlist, $gid)
{
    global $forumlist;

    if (empty($threadlist)) return NULL;

    

    foreach ($threadlist as $tid => $thread) {
        if (empty($forumlist[$thread['fid']]['accesson'])) continue;
        if ($thread['sticky'] > 0) continue;
        if (!forum_access_user($thread['fid'], $gid, 'allowread')) {
            unset($threadlist[$tid]);
        }
    }

    
}

function well_thread_safe_info($thread)
{
    

    unset($thread['userip'], $thread['user']['threads'], $thread['user']['posts'], $thread['user']['credits'], $thread['user']['golds'], $thread['user']['money']);

    empty($thread['user']) || $thread['user'] = user_safe_info($thread['user']);

    

    return $thread;
}

// 过滤安全数据
function well_thread_filter(&$val)
{
    
    unset($val['userip'], $val['fid'], $val['flagid'], $val['type'], $val['user'], $val['create_date']);
    
}

//------------------------ 其他方法 ------------------------
// 集合主题tid，统一拉取，避免多次查询thread表
function thread_unified_pull($arr)
{
    global $gid, $fid;

    

    $stickylist = array_value($arr, 'stickylist', array());
    $tidlist = array_value($arr, 'tidlist', array());
    //$fid = array_value($arr, 'fid');

    

    // 合并过滤空数组
    //$tidlist = array_filter($stickylist + $tidlist);
    $tidarrlist = $tidlist = $stickylist + $tidlist;

    

    // 版块自定义
    list($flaglist, $flagtids) = flag_thread_by_fid($fid);
    empty($flagtids) || $tidarrlist += $flagtids;
    unset($flagtids);

    
    // 在这之前合并所有二维数组 tid值为键/array('tid值' => tid值)
    $tidarr = empty($tidarrlist) ? array() : arrlist_values($tidarrlist, 'tid');
    // 在这之前使用array_merge()前合并所有一维数组 tid/array(1,2,3)
    

    if (empty($tidarr)) return NULL;
    $tidarr = array_unique($tidarr);

    // 主题相关统一遍历后再归类
    $arrlist = well_thread_find($tidarr, count($tidarr));

    // 过滤没有权限访问的主题 / filter no permission thread
    well_thread_list_access_filter($arrlist, $gid);

    $threadlist = array();
    foreach ($arrlist as $_tid => &$_thread) {

        $_thread = well_thread_safe_info($_thread);

        // 归类列表数据
        isset($tidlist[$_thread['tid']]) and $threadlist[$_tid] = $_thread;

        

        // flag thread
        if (!empty($flaglist)) {
            foreach ($flaglist as $key => $val) {
                if (isset($val['tids']) && in_array($_thread['tid'], $val['tids'])) {
                    $flaglist[$key]['list'][array_search($_thread['tid'], $val['tids'])] = $_thread;
                    ksort($flaglist[$key]['list']);
                    
                }
            }
        }

        
    }

    
    // 按之前tidlist排序
    $threadlist = array2_sort_key($threadlist, $tidlist, 'tid');
    unset($arrlist, $tidlist);

    

    $arr = array('threadlist' => $threadlist, 'flaglist' => $flaglist);

    

    return $arr;
}

// read.php 详情页其他主题调用，集合tid统一拉取数据，最后归类
function thread_other_pull($thread)
{
    global $forumlist, $gid;

    

    $fid = array_value($thread, 'fid');
    $forum = array_value($forumlist, $fid);

    if (empty($forum)) return NULL;
    //$tid = array_value($thread, 'tid');
    //$tag_fmt = array_value($thread, 'tag_fmt');

    

    $arrlist = array();
    $tidlist = array();

    

    // 版块自定义
    list($flaglist, $flagtids) = flag_thread_by_fid($fid);
    empty($flagtids) || $tidlist += $flagtids;
    unset($flagtids);

    
    // 在这之前合并所有二维数组 tid值为键/array('tid值' => tid值)
    $tidarr = empty($tidlist) ? array() : arrlist_values($tidlist, 'tid');
    // 在这之前使用array_merge()前合并所有一维数组 tid/array(1,2,3)
    

    if (empty($tidarr)) return NULL;
    $tidarr = array_unique($tidarr);

    // 主题相关统一遍历后再归类
    $threadlist = well_thread_find($tidarr, count($tidarr));

    // 过滤没有权限访问的主题 / filter no permission thread
    well_thread_list_access_filter($threadlist, $gid);

    foreach ($threadlist as &$_thread) {

        $_thread = well_thread_safe_info($_thread);

        

        // flag thread
        if (!empty($flaglist)) {
            foreach ($flaglist as $key => $val) {
                if (isset($val['tids']) && in_array($_thread['tid'], $val['tids'])) {

                    $flaglist[$key]['list'][array_search($_thread['tid'], $val['tids'])] = $_thread;

                    ksort($flaglist[$key]['list']);

                    
                }
            }
        }

        
    }

    
    unset($threadlist);

    if (!empty($flaglist)) {
        foreach ($flaglist as &$val) {
            $i = 0;
            if (!isset($val['list'])) continue;
            foreach ($val['list'] as &$v) {
                ++$i;
                $v['i'] = $i;
            }
        }
        $arrlist['flaglist'] = $flaglist;
        unset($flaglist);
    }

    

    return $arrlist;
}

//--------------------------cache--------------------------
// 已格式化 从缓存中读取，避免重复从数据库取数据
function well_thread_read_cache($tid)
{
    global $conf;
    
    $key = 'website_thread_' . $tid;
    static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存，跨进程需要再加一层缓存：redis/memcached/xcache/apc
    if (isset($cache[$key])) return $cache[$key];
    if ('mysql' == $conf['cache']['type']) {
        $r = well_thread_read($tid);
    } else {
        $r = cache_get($key);
        if (NULL === $r) {
            $r = well_thread_read($tid);
            $r and cache_set($key, $r, 1800);
        }
    }
    $cache[$key] = $r ? $r : NULL;
    
    return $cache[$key];
}




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<a href="/biancheng">编程之家</a><a href="/biancheng/1770943287a2681944.html" title="首页">轻松掌握ZIP压缩包的奥秘：理论知识与实际操作完美结合！</a></div></div></div><div class="fzithome-com main container-w cl"><div class="fzithome-com mainl"><div class="fzithome-com art-post"><div class="fzithome-com title"><h1>轻松掌握ZIP压缩包的奥秘：理论知识与实际操作完美结合！</h1><div class="fzithome-com info"><span><a href="/biancheng"><i class="iconfont icon-crossborder-fill"></i>编程之家</a></span><span><i class="iconfont icon-browse"></i>25</span><span><i class="iconfont icon-message-fill"></i>0</span><span>
                        更新时间：2026-04-10 02:34:54</span></div></div><div class="fzithome-com art-content"><article class="single-post"><div class="fzithome-com entry"><div class="markdown_views prism-tomorrow-night-eighties" id="content_views"><svg style="display: none;" xmlns=""><path d="M5,0 0,2.5 5,5z" id="raphael-marker-block" stroke-linecap="round" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"></path></svg><h2>
  【前言】
 </h2><blockquote><p>
   Android的安装包.apk实际上就是个
   的压缩包，所以在了解apk签名之前，有必要先来探索一下zip格式压缩包的结构
  </p></blockquote><h2>
  一、Zip格式结构图总览
 </h2><p></p><h2>
  二、Zip文件结构详解
 </h2><p>
  zip格式压缩包主要由三大部分组成：
  <code>
   数据区
  </code>
  、
  <code>
   中央目录记录区（也有叫核心目录记录）
  </code>
  、
  <code>
   中央目录记录尾部区
  </code></p><h3>
  1、数据区
 </h3><p>
  数据区是由一系列
  <code>
   本地文件记录
  </code>
  组成，本地文件记录主要是记录了
  <code>
   压缩前后文件的元数据
  </code>
  以及
  <code>
   存放压缩后的文件
  </code>
  ，组成部分也分为三大部分：
  <code>
   本地文件头
  </code>
  、
  <code>
   文件数据
  </code>
  、
  <code>
   文件描述
  </code><br/><strong>
   1.1、本地文件头
  </strong><br/><br/>
  本地文件头主要是记录了
  <code>
   压缩文件的元数据
  </code>
  ：
  <br/>
  1）0~3：4个字节，用来存放本地文件头标识：
  <code>
   0x04034b50
  </code>
  ，用于解压时候，读取判断文件头的开始
  <br/>
  2）4~5：2个字节，记录解压缩文件所需的最低支持的ZIP规范版本，apk压缩版本默认是
  <code>
   20
  </code>
  , 即
  <code>
   Deflate
  </code>
  压缩方式
 </p><blockquote><p>
   当前最低功能版本定义如下：（
   <code>
    压缩包记录的解压版本都是需要版本*10，比如：2.0 * 10 = 20
   </code>
   ）
   <br/>
   1.0 - 默认值
   <br/>
   1.1 - 文件是卷标
   <br/>
   2.0 - 文件是一个文件夹（目录）
   <br/>
   2.0 - 使用 Deflate 压缩来压缩文件
   <br/>
   2.0 - 使用传统的 PKWARE 加密对文件进行加密
   <br/>
   2.1 - 使用 Deflate64™ 压缩文件
   <br/>
   2.5 - 使用 PKWARE DCL Implode 压缩文件
   <br/>
   2.7 - 文件是补丁数据集
   <br/>
   4.5 - 文件使用 ZIP64 格式扩展
   <br/>
   4.6 - 使用 BZIP2 压缩文件压缩
   <br/>
   5.0 - 文件使用 DES 加密
   <br/>
   5.0 - 文件使用 3DES 加密
   <br/>
   5.0 - 使用原始 RC2 加密对文件进行加密
   <br/>
   5.0 - 使用 RC4 加密对文件进行加密
   <br/>
   5.1 - 文件使用 AES 加密进行加密
   <br/>
   5.1 - 使用更正的 RC2 加密对文件进行加密
   <br/>
   5.2 - 使用更正的 RC2-64 加密对文件进行加密
   <br/>
   6.1 - 使用非 OAEP 密钥包装对文件进行加密
   <br/>
   6.2 - 中央目录加密
  </p></blockquote><p>
  3）6~7：2个字节，记录通用标志位，
  <code>
   第0位为1
  </code>
  时（即二进制：00000000 00000001），表示
  <code>
   文件被加密
  </code>
  ，解压时候需要解密；
  <code>
   第3位为1
  </code>
  时候（即二进制：00000000 00000100），表示
  <code>
   有数据描述部分
  </code>
  ，
  <s>
   那么本地文件头中的
   <code>
    CRC-32
   </code>
   、
   <code>
    压缩大小
   </code>
   和
   <code>
    未压缩大小
   </code>
   字段都被设置为0
  </s>
  （虽然zip规范是这么定义，但是发现有些压缩包即使声明有数据描述部分，但是本地文件头的
  <code>
   CRC-32
  </code>
  、
  <code>
   压缩大小
  </code>
  和
  <code>
   未压缩大小
  </code>
  依然还是设置为真实值） ， 正确的值被放在紧跟在压缩数据之后的数据描述部分，
  <code>
   apk的通用标志位默认传0即可，也有传2048、2056
  </code>
  ，目前第15位是PKWARE保留位，没啥意义，更多通用标志位含义可见
  <br/>
  4）8~9：2个字节，记录压缩包所用到的压缩方式，
  <code>
   apk默认Deflate压缩
  </code>
  ，传
  <code>
   8
  </code>
  即可, 要是传
  <code>
   0
  </code>
  ，则是不压缩，各种压缩方式对应数值如下：
 </p><blockquote><p>
   0 - The file is stored (no compression)
   <br/>
   1 - The file is Shrunk
   <br/>
   2 - The file is Reduced with compression factor 1
   <br/>
   3 - The file is Reduced with compression factor 2
   <br/>
   4 - The file is Reduced with compression factor 3
   <br/>
   5 - The file is Reduced with compression factor 4
   <br/>
   6 - The file is Imploded
   <br/>
   7 - Reserved for Tokenizing compression algorithm
   <br/>
   8 - The file is Deflated
   <br/>
   9 - Enhanced Deflating using Deflate64™
   <br/>
   10 - PKWARE Data Compression Library Imploding
   <br/>
   11 - Reserved by PKWARE
   <br/>
   12 - File is compressed using BZIP2 algorithm
  </p></blockquote><p>
  5）10~11：2个字节，记录
  <code>
   文件最后修改时间
  </code>
  ，是MS-DOS格式编码的时间
  <br/><br/>
  6）12~13：2个字节，记录
  <code>
   文件最后修改日期
  </code>
  ，是MS-DOS格式编码的日期
  <br/>
  7）14~17：4个字节，记录
  <code>
   文件未压缩时的CRC-32校验码
  </code><br/>
  8）18~21：4个字节，记录
  <code>
   文件压缩后的大小
  </code><br/>
  9）22~25：4个字节，记录
  <code>
   文件未压缩的大小
  </code><br/>
  10）26~27：2个字节，记录
  <code>
   文件名的长度
  </code>
  (假设文件名长度为n)
  <br/>
  11）28~29：2个字节，记录
  <code>
   扩展区的长度
  </code>
  (假设扩展区长度为m)
  <br/>
  12）30~30+n: n个字节，记录
  <code>
   文件名
  </code><br/>
  13）30+n~30+n+m: m个字节，记录
  <code>
   扩展数据
  </code><br/><strong>
   1.2、文件数据
  </strong><br/>
  文件数据紧跟在本地文件头之后，一般是
  <code>
   压缩后的文件数据
  </code>
  或
  <code>
   压缩方式选择不压缩时候，用来存储未压缩文件数据
  </code>
  。
  <br/><strong>
   1.3、文件描述
  </strong><br/>
  文件描述符仅在通用位标志的
  <code>
   第 3 位被设置为1时
  </code>
  才存在。 它是字节对齐的，紧跟在文件数据的最后一个字节之后。当且仅当无法在 .ZIP 文件中查找时才使用此描述符，例如：当输出 的.ZIP 文件是标准输出或不可查找设备时使用文件描述，换句话说，正常情况下都不需要使用
  <br/><br/>
  数据描述符标识不一定有，因为一开始规范是没有的，后面才加上去的
 </p><h3>
  2、中央目录记录区（也称核心目录记录区 ）
 </h3><p>
  中央目录记录区是有一系列
  <code>
   中央目录记录
  </code>
  所组成，
  <code>
   一条中央目录记录
  </code>
  对应数据区中的
  <code>
   一个压缩文件记录
  </code>
  ，中央目录记录由以下部分构成：
  <br/>
  1）0~3：4个字节，记录核心目录文件头标识：
  <code>
   0x02014b50
  </code>
  ，用于解压时候，查找判断是否是中央目录的开始位置
  <br/>
  2）4~5：2个字节，
  <code>
   记录压缩所用的版本
  </code>
  ，同数据区本地文件头的解压所需版本，
  <code>
   apk设置20
  </code><br/>
  3）6~7：2个字节，
  <code>
   记录解压所需的最小版本
  </code>
  ，同数据区本地文件头的解压所需版本，
  <code>
   apk设置20
  </code><br/>
  4) 8~9：2个字节，
  <code>
   通用位标记
  </code>
  ，同数据区本地文件头的通用位标记
  <br/>
  5）
  <code>
   压缩方法
  </code>
  、
  <code>
   文件最后修改时间
  </code>
  、
  <code>
   文
  </code></p></div></div></article></div><div class="fzithome-com info"><div><span>本文发布于:2026-02-13，感谢您对本站的认可！</span></div><div><span>本文链接:</span><a href="https://www.fzithome.com/biancheng/1770943287a2681944.html" title="轻松掌握ZIP压缩包的奥秘：理论知识与实际操作完美结合！">https://www.fzithome.com/biancheng/1770943287a2681944.html</a></div><div><span>版权声明:本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系，我们将在24小时内删除。</span></div></div><span class="tag"><i class="iconfont icon-discount" style="font-size:12px;font-weight:bold;opacity:.7;">本文标签：</i><a href="/tag/825.html" target="_blank">记录</a><a href="/tag/68421.html" target="_blank">本地文件</a><a href="/tag/233276.html" target="_blank">个字节</a></span></div><div class="fzithome-com post_comments" id="comments"><div id="comt-respond" class="commentpost"><h4>发布评论
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