PAK File Format
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Revision as of 17:28, 11 June 2017 by Imathrowback (Talk | contribs)
PAK File
PAK files are archives of data used by RIFT. The manifest file contains references to PAK files and entries within the manifest contain offsets within those PAK files. This allows a client to download individual files directly out of the PAK using HTTP range headers.
File format
Little endian.
Consists of a file header followed by an entry block and finally data.
Header
| Bytes/Offset | Content | Comment |
|---|---|---|
| 4 bytes | Integer | File version |
| 4 bytes | Integer | File size in bytes |
| 4 bytes | Integer | Size of the header in bytes |
| 4 bytes | integer | Size of the entry block in bytes. Each entry is 60 bytes in size. |
Entry block
| Bytes/Offset | Content | Comment |
|---|---|---|
| 4 bytes | Integer | Unknown |
| 4 bytes | Integer | Unknown |
| 4 bytes | Integer | Unknown |
| 4 bytes | bytes | Filename hash- FNV1 |
| 4 bytes | Integer | Unknown |
| 4 bytes | Integer | Compressed size of the entry in bytes |
| 4 bytes | Integer | Uncompressed size of the entry in bytes |
| 4 bytes | Integer | Unknown |
| 4 bytes | Integer | Offset from the start of the file in bytes the data for this entry is at |
| 24 bytes | Unknown - possibly reserved for SHA hash? |
Data
The data is either compressed or uncompressed, you can determine if it is compressed by comparing the compressed and uncompressed size of the entry, if they are equal the data is uncompressed.
If compressed, LZMA2 is generally used.
