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emir, posted Tue Nov 25, 2014 8:04 pm (1983)

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MRCS Online



A similar to Loong CPK file , help to unpack

Client URL: http://download.ccjoy.com/shuguang/Clie ... 140804.exe


MRCS Online newer CPK file, may be something different to Loong OL CPK file format

CPKHeader encryption

sample file: http://www.mongofiles.com/file/76687/map.zip


The original Loong CPK format

Code:

CPK file formats:
// --------------------------------------------------------------------------------
// CPK file header (struct tagCPKHeader)
// --------------------------------------------------------------------------------
// Table item 0 (struct tagCPKTable)
// --------------------------------------------------------------------------------
// Table item 1
// --------------------------------------------------------------------------------
// Table item 2
// --------------------------------------------------------------------------------
// Table item 3
// --------------------------------------------------------------------------------
// ...
// --------------------------------------------------------------------------------
// ...
// --------------------------------------------------------------------------------
// the first file content (compression or not compressed)
// a simple file name (not including directory)
// Additional information - ExtraInfo
// --------------------------------------------------------------------------------
// the second file content (compression or not compressed)
// a simple file name (not including directory)
// Additional information - ExtraInfo
// --------------------------------------------------------------------------------
// for possible period of free space
// --------------------------------------------------------------------------------
// the third file content (compressed or not compressed)
// a simple file name (not including directory)
// Additional information - ExtraInfo
// --------------------------------------------------------------------------------
// ...
// --------------------------------------------------------------------------------

// CPK file header structure
Struct tagCPKHeader
{
   DWORD dwLable;      // file type logo (0x1a545352)
   DWORD dwVersion;   // version number
   DWORD dwTableStart;   // file table starting byte
   DWORD dwBlockStart;   // The starting address of data block
   DWORD dwMaxTableNum;   // maximum number of files stored
   DWORD dwFileNum;   // the current file number
   DWORD dwReserved [32].   // to keep
};
// CPK file table structure
Struct tagCPKTable
{
   DWORD dwCRC;      // CRC collation
   DWORD dwFlag;      // logo
   DWORD dwFatherCRC;   // the parent directory of CRC
   DWORD dwStartPos;   // start location
   DWORD dwPackedSize;   // compressed length
   DWORD dwOriginSize;   // the original file size
   DWORD dwExtraInfoSize;   // Size of additional information
};
// tagCPKTable dwFlag symbol of description:
// 0000, 0000-0000, 0000-0000, 0000-0000, 0001 (0 x0001) this file is valid
// 0000, 0000-0000, 0000-0000, 0000-0000, 0011 (0 x0002) this is a directory and effective
// 0000, 0000-0000, 0000-0000, 0000-0000, 0000 (0 x8000) CRC
// high 16 as filter number
// in addition to the file ontology, filename file additional information
Struct tagFileExtraInfo
{
   FILETIME CreateTime;      // set up time
   FILETIME LastAccessTime;   // the last access time
   FILETIME LastWriteTime;      // the last modified time
   FILETIME AddToPackageTime;   // join package time
   FILETIME DelFromPackageTime;   // remove time from the list of packages
   DWORD dwReserved [4].      // to keep
};

emir, posted Wed Nov 26, 2014 1:58 am (1987)

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Data compression method is:

LZO and LZSS compression

CPK Core Reference source code in c :
http://www.mongofiles.com/file/76689/CPKCore.zip

aluigi and Ekey, Please help.......