Painkiller PAK

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Choose archive extension:

PAK

• Format Type : Archive
  
• Endian Order : Little Endian
  

Format Specifications

byte {1}     - Determines if archive files are Zlib compressed. 0 - uncompressed, not zero - compressed
uint32 {4}   - position of file list described below

Not written yet

Encryption

Filenames are encrypted

EncryptedStringCharacter (n) = OriginalStringCharacter(n) XOR (shift left (string size) + 
1 + FileNumber + Code(string size) + n*2) 

(Where n starts at character position 0)

The Code(string size) you can get from the following algorithm:

Formula: (Size % 5)+2

String Size 0 -> Code = -2
String Size 1 -> Code = -1
String Size 2 -> Code = 0
String Size 3 -> Code = 1
String Size 4 -> Code = 2
String Size 5 -> Code = -2
String Size 6 -> Code = -1
String Size 7 -> Code = 0
.
.
.
And so forth

C++ function to decrypt file names:

/*
Two-way algorithm. Encoding a string two times will leave it decoded.
*/
void EncodeFilename(char *EntryName, BYTE NameLength, char FileIndex)
{
	BYTE n = 0;

	while ( n < NameLength )
	EntryName[n++] ^= FileIndex + NameLength % 5 + 2 * (n + NameLength);
}

MultiEx BMS

• A plugin processes these archives

Notes and Comments

None

Supported by Programs

• MultiEx Commander