PHP解析Android APK包的XML文件

2013/03/27 15:50
阅读数 1.5K


2012.07.05更新: 某些系统apk文件的字符串表不是使用双字节,会导致解码越界. 修改了getStringTab()成员函数, 详细请看代码部分.

最近做的一个项目需要用PHP直接读取apk包中的信息,如:包名,入口地址,版本号等信息。这些信息都保存在apk包中的AndroidManifest.xml文件中。但是在编译apk包的过程中,所有XML文件都经过了压缩编码,直接读取xml文件内容是无法解析出需要的信息的。

Google搜索了一下没有找到这个功能的PHP实现,只有找到一个Java工具AXMLPrinter,可以还原经过压缩后的XML文件内容。于是就参考了这个Java工具的源码,按照这个压缩后的XML文件格式写了一个PHP的还原功能类。

类实现了直接读取apk包中指定的XML文件内容(使用PHP的zip功能函数直接解压apk包),无需手动解压apk获取文件。

类功能不多,所有供外部调用的方法都表明了公开,私有函数均是解码函数,不推荐直接调用。

使用例子:

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<?php
require('apk_parser.php');
$p=newApkParser();
$res=$p->open('android_app.apk');
echo$p->getXML();
?>

apk_parser.php源代码:

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<?php
/******************************************************
 * Android APK File Parser
 * Author: Katana
 * Version: v0.1
 * Web: http://www.win-ing.cn
 *
 * 功能:解析安卓apk包中的压缩XML文件,还原和读取XML内容
 *
 * 依赖功能:需要PHP的ZIP包函数支持。
 ******************************************************/
 
classApkParser{
//----------------------
// 公共函数,供外部调用
//----------------------
    publicfunctionopen($apk_file,$xml_file='AndroidManifest.xml'){
        $zip=newZipArchive;
        if($zip->open($apk_file) === TRUE) {
            $xml=$zip->getFromName($xml_file);
            $zip->close();
            if($xml){
                try{
                    return$this->parseString($xml);
                }catch(Exception$e){
                }
            }
        }
        returnfalse;
    }
 
    publicfunctionparseString($xml){
        $this->xml =$xml;
        $this->length =strlen($xml);
 
        $this->root =$this->parseBlock(self::AXML_FILE);
        returntrue;
    }
 
    publicfunctiongetXML($node=NULL,$lv=-1){
        if($lv== -1)$node=$this->root;
        if(!$node)return'';
 
        if($node['type'] == self::END_TAG)$lv--;
        $xml= ($node['line'] == 0 ||$node['line'] ==$this->line) ?'':"\n".str_repeat('  ',$lv);
        $xml.=$node['tag'];
        $this->line =$node['line'];
        foreach($node['child']as$c){
            $xml.=$this->getXML($c,$lv+1);
        }
        return$xml;
    }
 
    publicfunctiongetPackage(){
        return$this->getAttribute('manifest','package');
    }
 
    publicfunctiongetVersionName(){
        return$this->getAttribute('manifest','android:versionName');
    }
 
    publicfunctiongetVersionCode(){
        return$this->getAttribute('manifest','android:versionCode');
    }
 
    publicfunctiongetAppName(){
        return$this->getAttribute('manifest/application','android:name');
    }
 
    publicfunctiongetMainActivity(){
        for($id=0; true;$id++){
            $act=$this->getAttribute("manifest/application/activity[{$id}]/intent-filter/action",'android:name');
            if(!$act)break;
            if($act=='android.intent.action.MAIN')return$this->getActivity($id);
        }
        returnNULL;
    }
 
    publicfunctiongetActivity($idx=0){
        $idx=intval($idx);
        return$this->getAttribute("manifest/application/activity[{$idx}]",'android:name');
    }
 
    publicfunctiongetAttribute($path,$name){
        $r=$this->getElement($path);
        if(is_null($r))returnNULL;
 
        if(isset($r['attrs'])){
            foreach($r['attrs']as$a){
                if($a['ns_name'] ==$name)return$this->getAttributeValue($a);
            }
        }
        returnNULL;
    }
 
//----------------------
// 类型常量定义
//----------------------
    constAXML_FILE             = 0x00080003;
    constSTRING_BLOCK          = 0x001C0001;
    constRESOURCEIDS           = 0x00080180;
    constSTART_NAMESPACE       = 0x00100100;
    constEND_NAMESPACE         = 0x00100101;
    constSTART_TAG             = 0x00100102;
    constEND_TAG               = 0x00100103;
    constTEXT                  = 0x00100104;
 
    constTYPE_NULL             =0;
    constTYPE_REFERENCE        =1;
    constTYPE_ATTRIBUTE        =2;
    constTYPE_STRING           =3;
    constTYPE_FLOAT            =4;
    constTYPE_DIMENSION        =5;
    constTYPE_FRACTION         =6;
    constTYPE_INT_DEC          =16;
    constTYPE_INT_HEX          =17;
    constTYPE_INT_BOOLEAN      =18;
    constTYPE_INT_COLOR_ARGB8  =28;
    constTYPE_INT_COLOR_RGB8   =29;
    constTYPE_INT_COLOR_ARGB4  =30;
    constTYPE_INT_COLOR_RGB4   =31;
 
    constUNIT_MASK             = 15;
    privatestatic$RADIX_MULTS=array(0.00390625, 3.051758E-005, 1.192093E-007, 4.656613E-010);
    privatestatic$DIMENSION_UNITS=array("px","dip","sp","pt","in","mm","","");
    privatestatic$FRACTION_UNITS =array("%","%p","","","","","","");
 
    private$xml='';
    private$length= 0;
    private$stringCount= 0;
    private$styleCount = 0;
    private$stringTab=array();
    private$styleTab =array();
    private$resourceIDs=array();
    private$ns=array();
    private$cur_ns= NULL;
    private$root= NULL;
    private$line= 0;
 
//----------------------
// 内部私有函数
//----------------------
    privatefunctiongetElement($path){
        if(!$this->root)returnNULL;
        $ps=explode('/',$path);
        $r =$this->root;
        foreach($psas$v){
            if(preg_match('/([^\[]+)\[([0-9]+)\]$/',$v,$ms)){
                $v=$ms[1];
                $off=$ms[2];
            }else{
                $off= 0;
            }
            foreach($r['child']as$c){
                if($c['type'] == self::START_TAG &&$c['ns_name'] ==$v){
                    if($off== 0){
                        $r=$c;continue2;
                    }else{
                        $off--;
                    }
                }
            }
            // 没有找到节点
            returnNULL;
        }
        return$r;
    }
 
    privatefunctionparseBlock($need= 0){
        $o= 0;
        $type=$this->get32($o);
        if($need&&$type!=$need)thrownewException('Block Type Error', 1);
        $size=$this->get32($o);
        if($size< 8 ||$size>$this->length)thrownewException('Block Size Error', 2);
        $left=$this->length -$size;
 
        $props= false;
        switch($type){
            caseself::AXML_FILE:
                $props=array(
                    'line'=> 0,
                    'tag'=>'<?xml version="1.0" encoding="utf-8"?>'
                );
            break;
            caseself::STRING_BLOCK:
                $this->stringCount =$this->get32($o);
                $this->styleCount  =$this->get32($o);
                $o+= 4;
                $strOffset=$this->get32($o);
                $styOffset=$this->get32($o);
                $strListOffset=$this->get32array($o,$this->stringCount);
                $styListOffset=$this->get32array($o,$this->styleCount);
                $this->stringTab =$this->stringCount > 0 ?$this->getStringTab($strOffset,$strListOffset) :array();
                $this->styleTab  =$this->styleCount > 0 ?$this->getStringTab($styOffset,$styListOffset) :array();
                $o=$size;
            break;
            caseself::RESOURCEIDS:
                $count=$size/ 4 - 2;
                $this->resourceIDs =$this->get32array($o,$count);
            break;
            caseself::START_NAMESPACE:
                $o+= 8;
                $prefix=$this->get32($o);
                $uri=$this->get32($o);
 
                if(empty($this->cur_ns)){
                    $this->cur_ns =array();
                    $this->ns[] = &$this->cur_ns;
                }
                $this->cur_ns[$uri] =$prefix;
            break;
            caseself::END_NAMESPACE:
                $o+= 8;
                $prefix=$this->get32($o);
                $uri=$this->get32($o);
 
                if(empty($this->cur_ns))break;
                unset($this->cur_ns[$uri]);
            break;
            caseself::START_TAG:
                $line=$this->get32($o);
 
                $o+= 4;
                $attrs=array();
                $props=array(
                    'line'=>$line,
                    'ns'=>$this->getNameSpace($this->get32($o)),
                    'name'=>$this->getString($this->get32($o)),
                    'flag'=>$this->get32($o),
                    'count'=>$this->get16($o),
                    'id'=>$this->get16($o)-1,
                    'class'=>$this->get16($o)-1,
                    'style'=>$this->get16($o)-1,
                    'attrs'=> &$attrs
                );
                $props['ns_name'] =$props['ns'].$props['name'];
                for($i=0;$i<$props['count'];$i++){
                    $a=array(
                        'ns'=>$this->getNameSpace($this->get32($o)),
                        'name'=>$this->getString($this->get32($o)),
                        'val_str'=>$this->get32($o),
                        'val_type'=>$this->get32($o),
                        'val_data'=>$this->get32($o)
                    );
                    $a['ns_name'] =$a['ns'].$a['name'];
                    $a['val_type'] >>= 24;
                    $attrs[] =$a;
                }
                // 处理TAG字符串
                $tag="<{$props['ns_name']}";
                foreach($this->cur_nsas$uri=>$prefix){
                    $uri=$this->getString($uri);
                    $prefix=$this->getString($prefix);
                    $tag.=" xmlns:{$prefix}=\"{$uri}\"";
                }
                foreach($props['attrs']as$a){
                    $tag.=" {$a['ns_name']}=\"".
                            $this->getAttributeValue($a).
                            '"';
                }
                $tag.='>';
                $props['tag'] =$tag;
 
                unset($this->cur_ns);
                $this->cur_ns =array();
                $this->ns[] = &$this->cur_ns;
                $left= -1;
            break;
            caseself::END_TAG:
                $line=$this->get32($o);
                $o+= 4;
                $props=array(
                    'line'=>$line,
                    'ns'=>$this->getNameSpace($this->get32($o)),
                    'name'=>$this->getString($this->get32($o))
                );
                $props['ns_name'] =$props['ns'].$props['name'];
                $props['tag'] ="</{$props['ns_name']}>";
                if(count($this->ns) > 1){
                    array_pop($this->ns);
                    unset($this->cur_ns);
                    $this->cur_ns =array_pop($this->ns);
                    $this->ns[] = &$this->cur_ns;
                }
            break;
            caseself::TEXT:
                $o+= 8;
                $props=array(
                    'tag'=>$this->getString($this->get32($o))
                );
                $o+= 8;
            break;
            default:
                thrownewException('Block Type Error', 3);
            break;
        }
 
        $this->skip($o);
        $child=array();
        while($this->length >$left){
            $c=$this->parseBlock();
            if($props&&$c)$child[] =$c;
            if($left== -1 &&$c['type'] == self::END_TAG){
                $left=$this->length;
                break;
            }
        }
        if($this->length !=$left)thrownewException('Block Overflow Error', 4);
        if($props){
            $props['type'] =$type;
            $props['size'] =$size;
            $props['child'] =$child;
            return$props;
        }else{
            returnfalse;
        }
    }
 
    privatefunctiongetAttributeValue($a){
        $type= &$a['val_type'];
        $data= &$a['val_data'];
        switch($type){
            caseself::TYPE_STRING:
                return$this->getString($a['val_str']);
            caseself::TYPE_ATTRIBUTE:
                returnsprintf('?%s%08X', self::_getPackage($data),$data);
            caseself::TYPE_REFERENCE:
                returnsprintf('@%s%08X', self::_getPackage($data),$data);
            caseself::TYPE_INT_HEX:
                returnsprintf('0x%08X',$data);
            caseself::TYPE_INT_BOOLEAN:
                return($data!= 0 ?'true':'false');
            caseself::TYPE_INT_COLOR_ARGB8:
            caseself::TYPE_INT_COLOR_RGB8:
            caseself::TYPE_INT_COLOR_ARGB4:
            caseself::TYPE_INT_COLOR_RGB4:
                returnsprintf('#%08X',$data);
            caseself::TYPE_DIMENSION:
                return$this->_complexToFloat($data).self::$DIMENSION_UNITS[$data& self::UNIT_MASK];
            caseself::TYPE_FRACTION:
                return$this->_complexToFloat($data).self::$FRACTION_UNITS[$data& self::UNIT_MASK];
            caseself::TYPE_FLOAT:
                return$this->_int2float($data);
        }
        if($type>=self::TYPE_INT_DEC &&$type< self::TYPE_INT_COLOR_ARGB8){
            return(string)$data;
        }
        returnsprintf('<0x%X, type 0x%02X>',$data,$type);
    }
 
    privatefunction_complexToFloat($data){
        return(float)($data& 0xFFFFFF00) * self::$RADIX_MULTS[($data>>4) & 3];
    }
    privatefunction_int2float($v) {
        $x= ($v& ((1 << 23) - 1)) + (1 << 23) * ($v>> 31 | 1);
        $exp= ($v>> 23 & 0xFF) - 127;
        return$x* pow(2,$exp- 23);
    }
    privatestaticfunction_getPackage($data){
        return($data>> 24 == 1) ?'android:':'';
    }
 
    privatefunctiongetStringTab($base,$list){
        $tab=array();
        foreach($listas$off){
            $off+=$base;
            $len=$this->get16($off);
            $mask= ($len>> 0x8) & 0xFF;
            $len=$len& 0xFF;
            if($len==$mask){
                if($off+$len>$this->length)thrownewException('String Table Overflow', 11);
                $tab[] =substr($this->xml,$off,$len);
            }else{
                if($off+$len* 2 >$this->length)thrownewException('String Table Overflow', 11);
                $str=substr($this->xml,$off,$len* 2);
                $tab[] = mb_convert_encoding($str,'UTF-8','UCS-2LE');
            }
        }
        return$tab;
    }
    privatefunctiongetString($id){
        if($id> -1 &&$id<$this->stringCount){
            return$this->stringTab[$id];
        }else{
            return'';
        }
    }
    privatefunctiongetNameSpace($uri){
        for($i=count($this->ns);$i> 0; ){
            $ns=$this->ns[--$i];
            if(isset($ns[$uri])){
                $ns=$this->getString($ns[$uri]);
                if(!empty($ns))$ns.=':';
                return$ns;
            }
        }
        return'';
    }
    privatefunctionget32(&$off){
        $int= unpack('V',substr($this->xml,$off, 4));
        $off+= 4;
        returnarray_shift($int);
    }
    privatefunctionget32array(&$off,$size){
        if($size<= 0)returnNULL;
        $arr= unpack('V*',substr($this->xml,$off, 4 *$size));
        if(count($arr) !=$size)thrownewException('Array Size Error', 10);
        $off+= 4 *$size;
        return$arr;
    }
    privatefunctionget16(&$off){
        $int= unpack('v',substr($this->xml,$off, 2));
        $off+= 2;
        returnarray_shift($int);
    }
    privatefunctionskip($size){
        $this->xml =substr($this->xml,$size);
        $this->length -=$size;
    }
}
?>
此条目由  绒毛 发表在  AndroidPHP 分类目录,并贴了  apkPHPxml 标签。将 固定链接加入收藏夹。

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