big_unpacker

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  using System; using System.IO; using System.Linq; 
  using System.Collections; using System.Collections.Generic; 
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class Finder
{
  static int BlockSize;
  static string WritePath;
  static string bigname;
  static int counter = 0;
  static int offset = 0;
	static byte[] ByteArray;
	static byte[] array1d;
	static BinaryReader br;

	static void Main()	
	{
    var filesName = Directory.GetFiles(
    Directory.GetCurrentDirectory(), "*.big",  SearchOption.AllDirectories); 

    foreach ( string bigFname in filesName )
    {
      array1d = File.ReadAllBytes(bigFname); 
      bigname = bigFname;
      using (br = new BinaryReader(File.Open(bigFname, FileMode.Open)))
      {
        for ( offset = 0 ; offset < array1d.Length ; offset++ ) 
        {
          if (FindString("goefile\0", offset) && FindString("symlist\0", offset+16))
          {
            byte[] temp = array1d.Take(16).ToArray(); 
            br.BaseStream.Position = offset+24;
            BlockSize = br.ReadInt32(); 
            ByteArray = new byte[BlockSize]; 
            br.BaseStream.Position = offset+16;
            ByteArray = br.ReadBytes(BlockSize);

            IEnumerable<byte> rv = temp.Concat(ByteArray);

            WritePath = bigname.Replace(".big", "goefile") + (counter++); 
            File.WriteAllBytes( WritePath, rv.ToArray() ) ; 
          }

          FindAndSaveBlock("bpackage",   offset);
          FindAndSaveBlock("cellgrup",   offset);
          FindAndSaveBlock("effect\0\0", offset);
          FindAndSaveBlock("lipsync\0",  offset);
          FindAndSaveBlock("litedata",   offset);
          FindAndSaveBlock("model\0\0\0",offset);
          FindAndSaveBlock("planinfo",   offset);
          FindAndSaveBlock("region\0\0", offset);
          FindAndSaveBlock("sample\0\0", offset);
          FindAndSaveBlock("sound\0\0\0",offset);
          FindAndSaveBlock("strmfile",   offset);
          FindAndSaveBlock("texture\0",  offset);
          FindAndSaveBlock("tunedata",   offset);
          FindAndSaveBlock("animatio",   offset);
          FindAndSaveBlock("animreel",   offset);
        }
      }
    }
  }

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  static bool FindString(string str, int i)
  {
    if (array1d[i+0] == str[0] && array1d[i+1] == str[1] && array1d[i+2] == str[2] && array1d[i+3] == str[3] &&
        array1d[i+4] == str[4] && array1d[i+5] == str[5] && array1d[i+6] == str[6] && array1d[i+7] == str[7] )
    return true;
    return false;   
  }

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  static void FindAndSaveBlock(string str, int i)
  {
    if (FindString(str, offset) && FindString("symlist\0", offset+20))
    {
      br.BaseStream.Position = offset + 8;
      BlockSize = br.ReadInt32(); 
      ByteArray = new byte[BlockSize];
      br.BaseStream.Position = offset;
      ByteArray = br.ReadBytes(BlockSize); 
      WritePath = bigname.Replace(".big", str.Replace("\0", "")) + (counter++); 
      File.WriteAllBytes( WritePath, ByteArray ) ; 
    }
  }

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}