ida分析readFile相关函数遇到问题

白云点缀的蓝

希望有大佬能分析代码的相关逻辑,
写一下注释,翻译一下就行,我可以自己写提取代码,感谢
输入假码获取相关关键信息


通过搜索关键字符串,定位到如下代码

再次点击播放出现如下信息

我们用相关加密软件加密其他视频,然后分析看看,是否为秘钥


再次定位到弹出错误的地方,然后出现如下信息



我们分析一下加密软件的播放算法





经过定位点击按钮的事件,我们在od中找到了加密call


加密软件默认加密秘钥为123456
可以看到在堆栈中有相关秘钥的信息,且与我们之前分析的加密好的文件中那串字符串一模一样,
由此推断,这串字符串就是加密后的秘钥


我们试试修改那串秘钥字符串为自己的秘钥字符串,然后生成播放密码进行测试









然后点击播放,可以看到,已经可以绕过原有的播放密码进行播放了



然后这样虽然能正常播放,但是每次播放都要修改秘钥,而且文件还特别多,很麻烦,想试试提取


我们知道,他要播放一个视频,他必须读取原有播放文件,然后进行解密,然后才能正常播放,
所以我们从ReadFile函数入手





下面的这次读取应该就是读取加密文件了,



我们再运行一次,然后跟踪读取出来的数据



我们打开16进制编辑工具,然后进行分析,可以看到,确实是读取了加密的文件数据



我们跟踪一下调用ReadFile返回后的地方


接下来我们用IDA分析,比较方便一点,用ida前,先计算一下偏移,因为调用ReadFile函数的是一个dll,
在静态分析dll,加载的地址都是10001000



计算出偏移后,我们打开ida,定位那个调用ReadFile函数进行读取加密文件的地方,





然后,我就卡在这了,因为我也没有相关做加密解密相关的经验,这代码一看,挺蒙的,
而且还没有注释,提示什么的都没有,所以只好求助一下大家




下面这个是这个函数的交叉引用,推断是读取数据后,存入堆内存,然后交叉引用进行解密操作

下面就是贴代码,
代码1:调用ReadFile的函数:

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unsigned int __cdecl _read_nolock(int FileHandle, LPVOID lpBuffer, DWORD nNumberOfBytesToRead) {   DWORD v3; // edx   unsigned int result; // eax   int *v5; // edi   int v6; // eax   int v7; // esi   char v8; // cl   CHAR *v9; // ebx   int v10; // eax   int v11; // ecx   int v12; // edx   int v13; // ecx   CHAR *v14; // eax   CHAR v15; // cl   bool v16; // zf   int v17; // ecx   CHAR v18; // cl   int v19; // ecx   CHAR v20; // cl   int v21; // ecx   int v22; // eax   char *v23; // eax   CHAR *v24; // ebx   CHAR v25; // al   _BYTE *v26; // eax   _BYTE *v27; // ebx   int v28; // ecx   int v29; // eax   char v30; // dl   _BYTE *v31; // ebx   int v32; // ebx   unsigned int v33; // eax   int v34; // edx   BOOL v35; // ecx   CHAR *v36; // ebx   int v37; // ecx   _BYTE *v38; // esi   __int16 v39; // [esp-Ch] [ebp-2Ch]   DWORD v40; // [esp+4h] [ebp-1Ch]   DWORD NumberOfBytesRead; // [esp+8h] [ebp-18h] BYREF   unsigned int v42; // [esp+Ch] [ebp-14h]   LPCCH lpMultiByteStr; // [esp+10h] [ebp-10h]   unsigned int v44; // [esp+14h] [ebp-Ch]   __int16 v45; // [esp+18h] [ebp-8h] BYREF   char v46; // [esp+1Eh] [ebp-2h]   char Buffer; // [esp+1Fh] [ebp-1h] BYREF   LPCCH nNumberOfBytesToReada; // [esp+30h] [ebp+10h]   LPCCH nNumberOfBytesToReadb; // [esp+30h] [ebp+10h]     v3 = nNumberOfBytesToRead;   v42 = -2;   v40 = nNumberOfBytesToRead;   if ( FileHandle == -2 )   {     *__doserrno() = 0;     *_errno() = 9;     return -1;   }   if ( FileHandle < 0 || FileHandle >= uNumber )   {     *__doserrno() = 0;     *_errno() = 9;     _invalid_parameter_noinfo();     return -1;   }   v5 = &dword_10DEADC0[FileHandle >> 5];   v6 = *v5;   v7 = (FileHandle & 0x1F) << 6;   v8 = *(_BYTE *)(*v5 + v7 + 4);   if ( (v8 & 1) == 0 )   {     *__doserrno() = 0;     *_errno() = 9; LABEL_19:     _invalid_parameter_noinfo();     return -1;   }   if ( nNumberOfBytesToRead > 0x7FFFFFFF )     goto LABEL_18;   v44 = 0;   if ( !nNumberOfBytesToRead || (v8 & 2) != 0 )     return 0;   if ( !lpBuffer )     goto LABEL_18;   v46 = (char)(2 * *(_BYTE *)(v6 + v7 + 36)) >> 1;   if ( v46 != 1 )   {     if ( v46 != 2 )     { LABEL_16:       v9 = (CHAR *)lpBuffer;       lpMultiByteStr = (LPCCH)lpBuffer;       goto LABEL_26;     }     if ( (nNumberOfBytesToRead & 1) == 0 )     {       nNumberOfBytesToRead &= 0xFFFFFFFE;       goto LABEL_16;     } LABEL_18:     *__doserrno() = 0;     *_errno() = 22;     goto LABEL_19;   }   if ( (nNumberOfBytesToRead & 1) != 0 )     goto LABEL_18;   nNumberOfBytesToRead = 4;   if ( v3 >> 1 >= 4 )     nNumberOfBytesToRead = v3 >> 1;   v9 = (CHAR *)_malloc_crt(nNumberOfBytesToRead);   lpMultiByteStr = v9;   if ( !v9 )   {     *_errno() = 12;     *__doserrno() = 8;     return -1;   }   v10 = _lseeki64_nolock(FileHandle, 0, 0, 1u);   v11 = *v5;   *(_DWORD *)(v7 + v11 + 40) = v10;   *(_DWORD *)(v7 + v11 + 44) = v12; LABEL_26:   v13 = v7 + *v5;   v14 = v9;   if ( (*(_BYTE *)(v13 + 4) & 0x48) != 0 )   {     v15 = *(_BYTE *)(v13 + 5);     if ( v15 != 10 )     {       if ( nNumberOfBytesToRead )       {         --nNumberOfBytesToRead;         v16 = v46 == 0;         *v9 = v15;         v17 = *v5;         v14 = v9 + 1;         v44 = 1;         *(_BYTE *)(v7 + v17 + 5) = 10;         if ( !v16 )         {           v18 = *(_BYTE *)(v7 + *v5 + 37);           if ( v18 != 10 )           {             if ( nNumberOfBytesToRead )             {               *v14 = v18;               v19 = *v5;               v14 = v9 + 2;               --nNumberOfBytesToRead;               v16 = v46 == 1;               v44 = 2;               *(_BYTE *)(v7 + v19 + 37) = 10;               if ( v16 )               {                 v20 = *(_BYTE *)(v7 + *v5 + 38);                 if ( v20 != 10 )                 {                   if ( nNumberOfBytesToRead )                   {                     *v14 = v20;                     v21 = *v5;                     v14 = v9 + 3;                     --nNumberOfBytesToRead;                     v44 = 3;                     *(_BYTE *)(v7 + v21 + 38) = 10;                   }                 }               }             }           }         }       }     }   }   if ( !ReadFile(*(HANDLE *)(v7 + *v5), v14, nNumberOfBytesToRead, &NumberOfBytesRead, 0)     || (NumberOfBytesRead & 0x80000000) != 0     || NumberOfBytesRead > nNumberOfBytesToRead )   {     v33 = GetLastError();     if ( v33 == 5 )     {       *_errno() = 9;       *__doserrno() = 5;       goto LABEL_93;     }     if ( v33 == 109 )     {       v42 = 0;       goto $error_return$29001;     }     goto LABEL_92;   }   v22 = *v5;   v44 += NumberOfBytesRead;   v23 = (char *)(v7 + v22 + 4);   if ( *v23 < 0 )   {     if ( v46 != 2 )     {       if ( NumberOfBytesRead && *v9 == 10 )         *v23 |= 4u;       else         *v23 &= 0xFBu;       v24 = (CHAR *)lpMultiByteStr;       nNumberOfBytesToReada = lpMultiByteStr;       v44 += (unsigned int)lpMultiByteStr;       if ( (unsigned int)lpMultiByteStr < v44 )       {         do         {           v25 = *nNumberOfBytesToReada;           if ( *nNumberOfBytesToReada == 26 )           {             v26 = (_BYTE *)(v7 + *v5 + 4);             if ( (*v26 & 0x40) != 0 )               *v24++ = *nNumberOfBytesToReada;             else               *v26 |= 2u;             break;           }           if ( v25 == 13 )           {             if ( (unsigned int)nNumberOfBytesToReada < v44 - 1 )             {               if ( nNumberOfBytesToReada[1] == 10 )               {                 nNumberOfBytesToReada += 2;                 goto LABEL_52;               }               ++nNumberOfBytesToReada; LABEL_63:               *v24 = 13; LABEL_64:               ++v24;               continue;             }             ++nNumberOfBytesToReada;             if ( !ReadFile(*(HANDLE *)(v7 + *v5), &Buffer, 1u, &NumberOfBytesRead, 0) && GetLastError()               || !NumberOfBytesRead )             {               goto LABEL_63;             }             if ( (*(_BYTE *)(v7 + *v5 + 4) & 0x48) != 0 )             {               if ( Buffer != 10 )               {                 *v24 = 13;                 *(_BYTE *)(v7 + *v5 + 5) = Buffer;                 goto LABEL_64;               } LABEL_52:               *v24 = 10;               goto LABEL_64;             }             if ( v24 == lpMultiByteStr && Buffer == 10 )               goto LABEL_52;             _lseeki64_nolock(FileHandle, -1, -1, 1u);             if ( Buffer != 10 )               goto LABEL_63;           }           else           {             *v24++ = v25;             ++nNumberOfBytesToReada;           }         }         while ( (unsigned int)nNumberOfBytesToReada < v44 );       }       v44 = v24 - lpMultiByteStr;       if ( v46 != 1 || v24 == lpMultiByteStr )         goto $error_return$29001;       v27 = v24 - 1;       LOBYTE(v28) = *v27;       if ( (char)*v27 < 0 )       {         v29 = 1;         v28 = (unsigned __int8)v28;         while ( !byte_10921C60[v28] && v29 <= 4 && v27 >= lpMultiByteStr )         {           v28 = (unsigned __int8)*--v27;           ++v29;         }         v30 = *v27;         if ( !byte_10921C60[(unsigned __int8)*v27] )         {           *_errno() = 42; LABEL_93:           v42 = -1;           goto $error_return$29001;         }         if ( byte_10921C60[(unsigned __int8)*v27] + 1 == v29 )         {           v27 += v29;         }         else if ( (*(_BYTE *)(*v5 + v7 + 4) & 0x48) != 0 )         {           v31 = v27 + 1;           *(_BYTE *)(*v5 + v7 + 5) = v30;           if ( v29 >= 2 )             *(_BYTE *)(v7 + *v5 + 37) = *v31++;           if ( v29 == 3 )             *(_BYTE *)(v7 + *v5 + 38) = *v31++;           v27 = &v31[-v29];         }         else         {           _lseeki64_nolock(FileHandle, -v29, -v29 >> 31, 1u);         }       }       else       {         ++v27;       }       v32 = v27 - lpMultiByteStr;       v44 = MultiByteToWideChar(0xFDE9u, 0, lpMultiByteStr, v32, (LPWSTR)lpBuffer, v40 >> 1);       if ( v44 )       {         v34 = *v5;         v35 = v44 != v32;         v44 *= 2;         *(_DWORD *)(v7 + v34 + 48) = v35;         goto $error_return$29001;       }       v33 = GetLastError(); LABEL_92:       _dosmaperr(v33);       goto LABEL_93;     }     if ( NumberOfBytesRead && *(_WORD *)v9 == 10 )       *v23 |= 4u;     else       *v23 &= 0xFBu;     v36 = (CHAR *)lpMultiByteStr;     nNumberOfBytesToReadb = lpMultiByteStr;     v44 += (unsigned int)lpMultiByteStr;     if ( (unsigned int)lpMultiByteStr >= v44 )     { LABEL_129:       v44 = v36 - lpMultiByteStr;       goto $error_return$29001;     }     while ( 1 )     {       v37 = *(unsigned __int16 *)nNumberOfBytesToReadb;       if ( v37 == 26 )       {         v38 = (_BYTE *)(v7 + *v5 + 4);         if ( (*v38 & 0x40) != 0 )         {           *(_WORD *)v36 = *(_WORD *)nNumberOfBytesToReadb;           v36 += 2;         }         else         {           *v38 |= 2u;         }         goto LABEL_129;       }       if ( v37 == 13 )       {         if ( (unsigned int)nNumberOfBytesToReadb < v44 - 2 )         {           if ( *((_WORD *)nNumberOfBytesToReadb + 1) == 10 )           {             nNumberOfBytesToReadb += 4;             goto LABEL_110;           }           nNumberOfBytesToReadb += 2; LABEL_121:           v39 = 13; LABEL_122:           *(_WORD *)v36 = v39;           goto LABEL_123;         }         nNumberOfBytesToReadb += 2;         if ( !ReadFile(*(HANDLE *)(v7 + *v5), &v45, 2u, &NumberOfBytesRead, 0) && GetLastError() || !NumberOfBytesRead )           goto LABEL_121;         if ( (*(_BYTE *)(v7 + *v5 + 4) & 0x48) != 0 )         {           if ( v45 != 10 )           {             *(_WORD *)v36 = 13;             *(_BYTE *)(v7 + *v5 + 5) = v45;             *(_BYTE *)(v7 + *v5 + 37) = HIBYTE(v45);             *(_BYTE *)(v7 + *v5 + 38) = 10; LABEL_123:             v36 += 2;             goto LABEL_124;           } LABEL_110:           v39 = 10;           goto LABEL_122;         }         if ( v36 == lpMultiByteStr && v45 == 10 )           goto LABEL_110;         _lseeki64_nolock(FileHandle, -2, -1, 1u);         if ( v45 != 10 )           goto LABEL_121;       }       else       {         *(_WORD *)v36 = v37;         v36 += 2;         nNumberOfBytesToReadb += 2;       } LABEL_124:       if ( (unsigned int)nNumberOfBytesToReadb >= v44 )         goto LABEL_129;     }   } $error_return$29001:   if ( lpMultiByteStr != lpBuffer )     free((void *)lpMultiByteStr);   result = v42;   if ( v42 == -2 )     result = v44;   return result; }

下面是交叉引用相关函数:

[C] 纯文本查看 复制代码

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int __usercall _tsopen_nolock@<eax>(int *a1@<eax>, int a2, LPCWSTR lpFileName, int a4, int a5, int a6) {   unsigned int v7; // eax   int v9; // eax   _BYTE *v10; // eax   unsigned int v11; // eax   DWORD v12; // eax   _BYTE *v13; // eax   unsigned int v14; // esi   char v15; // cl   _BYTE *v16; // eax   int v17; // edi   int v18; // eax   DWORD v19; // eax   DWORD v20; // eax   int v21; // edi   __int64 v22; // rax   int v23; // eax   int v24; // edx   unsigned int v25; // eax   __int64 v26; // rax   int v27; // eax   int v28; // edx   int v29; // eax   int v30; // ebx   int v31; // eax   _BYTE *v32; // eax   _BYTE *v33; // eax   bool v34; // zf   _BYTE *v35; // eax   HANDLE v36; // eax   unsigned int v37; // eax   _BYTE *v38; // eax   DWORD v39; // [esp-Ch] [ebp-48h]   int v40; // [esp-8h] [ebp-44h]   struct _SECURITY_ATTRIBUTES SecurityAttributes; // [esp+8h] [ebp-34h] BYREF   int Buffer; // [esp+14h] [ebp-28h] BYREF   int v43; // [esp+18h] [ebp-24h] BYREF   HANDLE hFile; // [esp+1Ch] [ebp-20h]   int Buf; // [esp+20h] [ebp-1Ch] BYREF   DWORD dwCreationDisposition; // [esp+24h] [ebp-18h]   DWORD dwShareMode; // [esp+28h] [ebp-14h]   DWORD dwFlagsAndAttributes; // [esp+2Ch] [ebp-10h]   DWORD dwDesiredAccess; // [esp+30h] [ebp-Ch]   int v50; // [esp+34h] [ebp-8h]   char v51; // [esp+39h] [ebp-3h]   char v52; // [esp+3Ah] [ebp-2h]   char v53; // [esp+3Bh] [ebp-1h]     v43 = 0;   v52 = 0;   v50 = 0;   SecurityAttributes.nLength = 12;   SecurityAttributes.lpSecurityDescriptor = 0;   if ( (a4 & 0x80u) == 0 )   {     SecurityAttributes.bInheritHandle = 1;     v53 = 0;   }   else   {     SecurityAttributes.bInheritHandle = 0;     v53 = 16;   }   if ( sub_106CE235(&v43) )     _invoke_watson(0, 0, 0, 0, 0);   if ( (a4 & 0x8000) == 0 && ((a4 & 0x74000) != 0 || v43 != 0x8000) )     v53 |= 0x80u;   if ( (a4 & 3) != 0 )   {     if ( (a4 & 3) != 1 )     {       if ( (a4 & 3) != 2 )         goto LABEL_40;       goto LABEL_13;     }     if ( (a4 & 8) != 0 && (a4 & 0x70000) != 0 )     { LABEL_13:       dwDesiredAccess = -1073741824;       goto LABEL_18;     }     dwDesiredAccess = 0x40000000;   }   else   {     dwDesiredAccess = 0x80000000;   } LABEL_18:   switch ( a5 )   {     case 16:       dwShareMode = 0;       break;     case 32:       dwShareMode = 1;       break;     case 48:       dwShareMode = 2;       break;     case 64:       dwShareMode = 3;       break;     case 128:       dwShareMode = dwDesiredAccess == 0x80000000;       break;     default:       goto LABEL_40;   }   v7 = a4 & 0x700;   if ( v7 > 0x400 )   {     if ( v7 != 1280 )     {       if ( v7 == 1536 )         goto LABEL_41;       if ( v7 != 1792 )         goto LABEL_40;     }     dwCreationDisposition = 1;     goto LABEL_43;   }   if ( (a4 & 0x700) == 1024 || (a4 & 0x700) == 0 )   {     dwCreationDisposition = 3;     goto LABEL_43;   }   if ( v7 == 256 )   {     dwCreationDisposition = 4;     goto LABEL_43;   }   if ( v7 == 512 )   { LABEL_41:     dwCreationDisposition = 5;     goto LABEL_43;   }   if ( v7 != 768 )   { LABEL_40:     *__doserrno() = 0;     *a1 = -1;     *_errno() = 22;     _invalid_parameter_noinfo();     return 22;   }   dwCreationDisposition = 2; LABEL_43:   dwFlagsAndAttributes = 128;   if ( (a4 & 0x100) != 0 && (a6 & ~(_BYTE)dword_10D4CDFC & 0x80u) == 0 )     dwFlagsAndAttributes = 1;   if ( (a4 & 0x40) != 0 )   {     dwFlagsAndAttributes |= 0x4000000u;     dwDesiredAccess |= 0x10000u;     dwShareMode |= 4u;   }   if ( (a4 & 0x1000) != 0 )     dwFlagsAndAttributes |= 0x100u;   if ( (a4 & 0x20) != 0 )   {     dwFlagsAndAttributes |= 0x8000000u;   }   else if ( (a4 & 0x10) != 0 )   {     dwFlagsAndAttributes |= (unsigned int)&_ImageBase;   }   v9 = _alloc_osfhnd();   *a1 = v9;   if ( v9 == -1 )   {     *__doserrno() = 0;     *a1 = -1;     *_errno() = 24;     return *_errno();   }   v39 = dwFlagsAndAttributes;   *(_DWORD *)a2 = 1;   hFile = CreateFileW(lpFileName, dwDesiredAccess, dwShareMode, &SecurityAttributes, dwCreationDisposition, v39, 0);   if ( hFile != (HANDLE)-1     || (dwDesiredAccess & 0xC0000000) == -1073741824     && (a4 & 1) != 0     && (dwDesiredAccess &= 0x7FFFFFFFu,         hFile = CreateFileW(                   lpFileName,                   dwDesiredAccess,                   dwShareMode,                   &SecurityAttributes,                   dwCreationDisposition,                   dwFlagsAndAttributes,                   0),         hFile != (HANDLE)-1) )   {     v12 = GetFileType(hFile);     switch ( v12 )     {       case 0u:         v13 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 4);         *v13 &= 0xFEu;         v14 = GetLastError();         _dosmaperr(v14);         CloseHandle(hFile);         if ( !v14 )           *_errno() = 13;         return *_errno();       case 2u:         v53 |= 0x40u;         break;       case 3u:         v53 |= 8u;         break;     }     _set_osfhnd(*a1, hFile);     v15 = v53 | 1;     *(_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 4) = v53 | 1;     v16 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 36);     *v16 &= 0x80u;     v51 = v15 & 0x48;     v53 = v15;     if ( (v15 & 0x48) == 0 )     {       if ( v15 >= 0 )         goto LABEL_131;       if ( (a4 & 2) != 0 )       {         v17 = _lseek_nolock(*a1, -1, 2u);         if ( v17 == -1 )         {           if ( *__doserrno() != 131 )           { LABEL_74:             _close_nolock(*a1);             return *_errno();           }         }         else         {           Buffer = 0;           if ( !_read_nolock(*a1, &Buffer, 1u) && (_WORD)Buffer == 26 && _chsize_nolock(*a1, v17, v17 >> 31) == -1             || _lseek_nolock(*a1, 0, 0) == -1 )           {             goto LABEL_74;           }         }       }     }     if ( v53 >= 0 )     { LABEL_131:       v32 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 36);       *v32 ^= (v52 ^ *v32) & 0x7F;       v33 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 36);       v34 = v51 == 0;       *v33 = *v33 & 0x7F | (BYTE2(a4) << 7);       if ( v34 && (a4 & 8) != 0 )       {         v35 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 4);         *v35 |= 0x20u;       }       if ( (dwDesiredAccess & 0xC0000000) != -1073741824 || (a4 & 1) == 0 )         return v50;       CloseHandle(hFile);       v36 = CreateFileW(               lpFileName,               dwDesiredAccess & 0x7FFFFFFF,               dwShareMode,               &SecurityAttributes,               3u,               dwFlagsAndAttributes,               0);       if ( v36 != (HANDLE)-1 )       {         *(_DWORD *)(((*a1 & 0x1F) << 6) + dword_10DEADC0[*a1 >> 5]) = v36;         return v50;       }       v37 = GetLastError();       _dosmaperr(v37);       v38 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 4);       *v38 &= 0xFEu;       _free_osfhnd(*a1);       return *_errno();     }     if ( (a4 & 0x74000) == 0 )     {       if ( (v43 & 0x74000) != 0 )         a4 |= v43 & 0x74000;       else         a4 |= 0x4000u;     }     v18 = a4 & 0x74000;     if ( (a4 & 0x74000) == 0x4000 )     {       v52 = 0;       goto LABEL_95;     }     if ( v18 == 0x10000 || v18 == 81920 )     {       if ( (a4 & 0x301) != 769 )         goto LABEL_95;     }     else if ( v18 != 0x20000 && v18 != 147456 )     {       if ( v18 == 0x40000 || v18 == 278528 )         v52 = 1; LABEL_95:       if ( (a4 & 0x70000) == 0 )         goto LABEL_131;       Buf = 0;       if ( (v53 & 0x40) != 0 )         goto LABEL_131;       v19 = dwDesiredAccess & 0xC0000000;       if ( (dwDesiredAccess & 0xC0000000) == 0x40000000 )       {         v20 = dwCreationDisposition;         if ( !dwCreationDisposition )           goto LABEL_131;         if ( dwCreationDisposition <= 2 )           goto LABEL_104;         if ( dwCreationDisposition > 4 )           goto LABEL_103;         LODWORD(v26) = _lseeki64_nolock(*a1, 0, 0, 2u);         if ( v26 )         {           v27 = _lseeki64_nolock(*a1, 0, 0, 0);           v29 = v28 & v27;           goto LABEL_119;         }       }       else       {         if ( v19 == 0x80000000 )           goto LABEL_109;         if ( v19 != -1073741824 )           goto LABEL_131;         v20 = dwCreationDisposition;         if ( !dwCreationDisposition )           goto LABEL_131;         if ( dwCreationDisposition > 2 )         {           if ( dwCreationDisposition > 4 )           { LABEL_103:             if ( v20 != 5 )               goto LABEL_131;             goto LABEL_104;           }           LODWORD(v22) = _lseeki64_nolock(*a1, 0, 0, 2u);           if ( v22 )           {             v23 = _lseeki64_nolock(*a1, 0, 0, 0);             if ( (v24 & v23) == -1 )               goto LABEL_74; LABEL_109:             v25 = _read_nolock(*a1, &Buf, 3u);             if ( v25 == -1 )               goto LABEL_74;             if ( v25 != 2 )             {               if ( v25 != 3 )               { LABEL_126:                 v29 = _lseek_nolock(*a1, 0, 0); LABEL_119:                 if ( v29 == -1 )                   goto LABEL_74;                 goto LABEL_131;               }               if ( Buf == 12565487 )               {                 v52 = 1;                 goto LABEL_131;               }             }             if ( (unsigned __int16)Buf == 65534 )             {               _close_nolock(*a1);               *_errno() = 22;               return 22;             }             if ( (unsigned __int16)Buf == 65279 )             {               if ( _lseek_nolock(*a1, 2, 0) == -1 )                 goto LABEL_74;               v52 = 2;               goto LABEL_131;             }             goto LABEL_126;           }         }       } LABEL_104:       v21 = 0;       if ( v52 == 1 )       {         Buf = 12565487;         v40 = 3; LABEL_128:         v30 = v40;         while ( 1 )         {           v31 = _write(*a1, (char *)&Buf + v21, v30 - v21);           if ( v31 == -1 )             goto LABEL_74;           v21 += v31;           if ( v30 <= v21 )             goto LABEL_131;         }       }       if ( v52 == 2 )       {         Buf = 65279;         v40 = 2;         goto LABEL_128;       }       goto LABEL_131;     }     v52 = 2;     goto LABEL_95;   }   v10 = (_BYTE *)(dword_10DEADC0[*a1 >> 5] + ((*a1 & 0x1F) << 6) + 4);   *v10 &= 0xFEu;   v11 = GetLastError();   _dosmaperr(v11);   return *_errno(); }

下面这个应该不是:
不过也是交叉引用了那个ReadFile的函数

[C] 纯文本查看 复制代码

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int __cdecl _read(int FileHandle, void *DstBuf, unsigned int MaxCharCount) {   int *v4; // edi   int v5; // esi   int v6; // [esp+14h] [ebp-1Ch]     if ( FileHandle == -2 )   {     *__doserrno() = 0;     *_errno() = 9;     return -1;   }   if ( FileHandle < 0     || FileHandle >= uNumber     || (v4 = &dword_10DEADC0[FileHandle >> 5], v5 = (FileHandle & 0x1F) << 6, (*(_BYTE *)(*v4 + v5 + 4) & 1) == 0) )   {     *__doserrno() = 0;     *_errno() = 9; LABEL_7:     _invalid_parameter_noinfo();     return -1;   }   if ( MaxCharCount > 0x7FFFFFFF )   {     *__doserrno() = 0;     *_errno() = 22;     goto LABEL_7;   }   __lock_fhandle(FileHandle);   if ( (*(_BYTE *)(*v4 + v5 + 4) & 1) != 0 )   {     v6 = _read_nolock(FileHandle, DstBuf, MaxCharCount);   }   else   {     *_errno() = 9;     *__doserrno() = 0;     v6 = -1;   }   _unlock_fhandle(FileHandle);   return v6; }

hpp0hpp

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