SoulMaster NPK file structure

Here you can find template for 010 Editor, which describes the structure of NPK files from SoulMaster.

Note: Use it with decrypted NPK.

Code:

---

//--------------------------------------
//--- 010 Editor v3.0.6 Binary Template
//
// File: npk
// Author: Genz
// Revision: 2010-08-10
// Purpose: unpack npk
//--------------------------------------

struct FileRec                      // variable structure size for decrypted npk
{
    uint FileOffset;                // File offsets in NPK
    uint PackedFileSize;
    uint UnpackedFileSize;
    uint Flags <format=binary>;    // not important
    time_t CreateTime;
    uint Zero;                      // Always zero
    uint StrSize;                  // Size of file name
    char FileName[StrSize];
   
    //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
    local uint64 Offset = FTell();
    FSeek(FileOffset);
    ubyte FileData[PackedFileSize];
    FSeek(Offset);
};

struct NpkHeader                    // NPK
{
    char Signature[4];              // NPK!
    uint HeaderSize;                // always 24
    uint FileCount;
    uint OffsetToNames <format=hex>;
    uint FirstFileOffset;          // = HeaderSize
    time_t FileCreationTime;
};

NpkHeader Header;
FSeek(Header.OffsetToNames);
FileRec File[Header.FileCount] <optimize=false>;

---

Can you explain a little more on how to use this?

HowTo:

1. Decrypt .npk
2. Open decrypted .npk in 010 Editor
3. Apply the template
4. You will get full .npk structure

This template will be useful for understanding file structure.

Today we will post decryptor + unpacker, and then encryption algorithm that used in SoulMaster