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Eggy Go, posted Sat Jul 02, 2022 11:44 pm (72392)

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Hi,

This is the first time I post here, so I'm really sorry if there's anything wrong!!

I'm playing eggy go recently.
The music of this game is really good and the font&model is cool.
I try to use Netease Games Tool to unpack the NPK file in the APK of the game, but unfortunately, it failed.
Anyone! Please help me!!!!

and In game file updates seem to be downloading files to

/storage/emulated/0/android/data/com netease. party/files/NeoX/Documents/

it is not NPK file seems: if you want,you can check it.

rabatini, posted Sun Jul 03, 2022 12:26 am (72410)

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Eggy Go wrote:

I'm playing eggy go recently.
The music of this game is really good and the font&model is cool.
I try to use Netease Games Tool to unpack the NPK file in the APK of the game, but unfortunately, it failed.
Anyone! Please help me!!!!

GAMEAPK DL:https://adl.netease.com/d/g/party/c/gw

and In game file updates seem to be downloading files to

/storage/emulated/0/android/data/com netease. party/files/NeoX/Documents/

it is not NPK file seems: if you want,you can check it.

Its not allowed post full game links here.

Eggy Go, posted Sun Jul 03, 2022 1:39 am (72414)

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rabatini wrote:

Eggy Go wrote:

I'm playing eggy go recently.
The music of this game is really good and the font&model is cool.
I try to use Netease Games Tool to unpack the NPK file in the APK of the game, but unfortunately, it failed.
Anyone! Please help me!!!!

and In game file updates seem to be downloading files to

/storage/emulated/0/android/data/com netease. party/files/NeoX/Documents/

it is not NPK file seems: if you want,you can check it.

Its not allowed post full game links here.

SORRY FOR IT!!!!!
I have re edited my post and deleted the link.
Is this correct?

3IMiner, posted Fri Jul 08, 2022 8:22 am (72525)

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I don't know if it's right. It's supposed to help you.
Compressed resource format of a game
Two structures are involved :

Code:

struct st_NpkHeader
{
   int _magic;//                   [_offset   0]
   int _count;//                   [_offset   4]   size(count * 28)   
   int _unknonw2;
   int _unknonw3;
   int _bUseTrunkCompressType;
   int _offset;
};

Code:

struct st_NpkTrunk
{
    int _trunkHash;
    int _dataOffset;
    int _compressSize;
    int _realSize;
    int _unknown1;
    int _unknonw2;
    int _compressType;
};

Full code:

Code:

// UnNpk.cpp : Define the entry point for the console application.
//
 
#include "./liblz4/lz4.h"
#include "./zlib/zlib.h"
#include "stdafx.h"
#include 
#include 
#include 
struct st_NpkHeader
{
   int _magic;//                   [_offset   0]
   int _count;//                   [_offset   4]   size(count * 28)   
   int _unknonw2;
   int _unknonw3;
   int _bUseTrunkCompressType;
   int _offset;
};
 
struct st_NpkTrunk
{
   int _trunkHash;
   int _dataOffset;
   int _compressSize;
   int _realSize;
   int _unknown1;
   int _unknonw2;
   int _compressType;
};
std::string GetNpkFileName(char *pData, unsigned int maxLen)
{
   std::string name;
   for (int i = 0; i < maxLen;   i)
   {
      if ((pData[i] >= 'a' && pData[i] <= 'z') 
         || (pData[i] >= 'A' && pData[i] <= 'Z') )
      {
         name  = pData[i];
      }
   }
   return name;
}
 
int _tmain(int argc, _TCHAR* argv[])
{
   if (argc < 2)
   {
      printf("%s npkFile\n", argv[0]);
      return 0;
   }
   FILE *fp = fopen(argv[1], "rb");
   if (!fp)
   {
      return 0;
   }
   unsigned int nFileLen = 0;
   fseek(fp,0,SEEK_END); //Navigate to the end of the file
   nFileLen = ftell(fp); //file length 
 
   fseek(fp,0,SEEK_SET);
 
   st_NpkHeader npkHeader;
   fread(&npkHeader, sizeof(npkHeader), 1, fp);
   if (npkHeader._magic != 0x4b50584e)
   {
      printf("not npk file\n");
      return 0;
   }
   fseek(fp,0,SEEK_SET);
 
   st_NpkTrunk* pNpkTrunkList = new st_NpkTrunk[npkHeader._count];
   std::string strDir = "./Dump";
   if (_access(strDir.c_str(), 0) != 0)
   {
      _mkdir(strDir.c_str());
   }
   fseek(fp, npkHeader._offset,SEEK_SET);
   int nRSize = fread(pNpkTrunkList, sizeof(st_NpkTrunk), npkHeader._count, fp);
   for (int i = 0; i < nRSize;   i)
   {
      fseek(fp, pNpkTrunkList[i]._dataOffset, SEEK_SET);
      char *pSrc = new char[pNpkTrunkList[i]._compressSize];      
      fread(pSrc, pNpkTrunkList[i]._compressSize, 1, fp);
      char *pDst = new char[pNpkTrunkList[i]._realSize];
      if (pNpkTrunkList[i]._compressType == 2)
      {
         LZ4_decompress_safe(pSrc, pDst, pNpkTrunkList[i]._compressSize, pNpkTrunkList[i]._realSize);
      }
      else if (pNpkTrunkList[i]._compressType == 1)
      {
         int realSize = pNpkTrunkList[i]._realSize;
         int nRet = uncompress((Bytef *)pDst, (uLongf*)&realSize, (Bytef *)pSrc, pNpkTrunkList[i]._compressSize);
      }
      else
      {
         memcpy(pDst, pSrc, pNpkTrunkList[i]._realSize);
      }      
      char fileName[126];      
      std::string format = GetNpkFileName(pDst, 5);   
      sprintf_s<126>(fileName, "%s/%x.%s", strDir.c_str(), pNpkTrunkList[i]._trunkHash, format.c_str());
      FILE *fp2 = fopen(fileName, "wb");
      fwrite(pDst, pNpkTrunkList[i]._realSize, 1, fp2);
      fclose(fp2);
 
      delete[] pSrc;
      delete[] pDst;
   }
   return 0;
}
 

I wish you success in decryption:)