IPAK Files: Difference between revisions

Revision as of 19:30, 20 December 2014

IPAK's, implemented in Black Ops 2, are basically an archive of compressed image data.

Structure

Thanks to kokole for the structure. struct IPakHeader {

 unsigned int magic;
 unsigned int version;
 unsigned int size;
 unsigned int sectionCount;

};

struct IPakSection {

 unsigned int type; //enum 0x1 = info, 0x2 = data
 unsigned int offset;
 unsigned int size;
 unsigned int itemCount;

};

struct IPakIndexEntry {

 unsigned __int64 key;
 unsigned int offset;
 unsigned int size;

};

struct IPakDataChunkHeader {

 unsigned int countAndOffset; // 24 bits = offset, 8 bits = count
 unsigned int commands[31]; //(depending on endian) blockSize = (info & 0xFFFF); , compressedFlag = info >> 24;

};

Decompression Methods

The compression method is just the basic LZO1X compression.

PC:

http://pastebin.com/vd9t2U2B

PS3:

1.00 t6mp_ps3f.self - 0x6AEA78

XBOX:

tu9 default_mp.xex - 0x828E5090
tu13 default_mp.xex - 0x828E6308

@@ Line 5: / Line 5: @@
 == Structure ==
 Thanks to kokole for the structure.
- struct ipak_header_t
+struct IPakHeader
- {
+{
- 	char identifier[4]; // "IPAK"
+  unsigned int magic;
- 	unsigned int version; //0x50000
+  unsigned int version;
- 	unsigned int fileSize;
+  unsigned int size;
- 	unsigned int sectionCount;
+  unsigned int sectionCount;
- };
+};
- struct section_t
+struct IPakSection
- {
+{
- 	unsigned int sectionIndex; //enum 0x1 = info, 0x2 = data
+  unsigned int type; //enum 0x1 = info, 0x2 = data
- 	unsigned int sectionStart;
+  unsigned int offset;
- 	unsigned int sectionLength;
+  unsigned int size;
- 	unsigned int numOfEntries; // each entry is a compressed iwi file in section 2 and entry info in section 1
+  unsigned int itemCount;
- };
+};
- struct entry_info_t
+struct IPakIndexEntry
- {
+{
- 	u32 hash; // checksum, type?
+  unsigned __int64 key;
- 	u32 id;
+  unsigned int offset;
- 	u32 entryStart; // location of compressed iwi file
+  unsigned int size;
- 	u32 entryLength;
+};
- }; // 16 bytes
- struct entry_t
+struct IPakDataChunkHeader
- {
+{
- 	entry_header_t header;
+  unsigned int countAndOffset; // 24 bits = offset, 8 bits = count
- 	block_info_t blocks[31]; //they can be null, actual number of blocks is header->blockCount;
+  unsigned int commands[31]; //(depending on endian) blockSize = (info & 0xFFFF); , compressedFlag = info >> 24;
- };
+};
- struct entry_header_t
- {
- 	int sizeOfPreviousBlocks : 24; // size of previously decompressed blocks, 0 if it's the first array of blocks for this file
- 	int blockCount : 8;
- };
- struct block_info_t
- {			//enum 0x0 = plaintext, 0x1 = encrypted
- 	unsigned int info; //(depending on endian) blockSize = (info & 0xFFFF); , compressedFlag = info >> 24;
- }; // 4 bytes
 == Decompression Methods ==