View source for Magic The Gathering CAT

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== CAT == 

* ''' Format Type ''':    Archive <br> 
* ''' [http://en.wikipedia.org/wiki/Endianness Endian Order] ''': Little Endian <br> 


=== Format Specifications === 

{{GRAFPageFormat|1=
{{BlockDescription| // Archive Header }}
: uint32 {4} &nbsp; - Number Of Files
: {{BlockDescription| // for each file}}
:: uint32 {4} &nbsp; - File Hash
:: uint32 {4} &nbsp; - File Offset
:: uint32 {4} &nbsp; - File Length

byte {X} &nbsp;&nbsp;&nbsp; - File Data}}

=== Notes and Comments ===

* The files in the directory are NOT in the same order as the files in the archive. ie. file 1 in the directory may actually be file 3827 in the archive, etc. Actually, all records sorted in ascending order of File Hash value.

* Hash routine in C++ code for Magic: The Gathering:
<pre>unsigned int mtg_hash(char *s){
unsigned int hash;
unsigned int part[2];
unsigned int k;
  hash = (s[0] ^ s[1]) << 24;
  part[0] = 0;
  part[1] = 0;
  k = 3;
  while(s[0]){
    part[k&1] = part[k&1] + (tolower(s[0])*k);
    k++;
    s++;
  }
  hash = ((part[0] * part[1]) & 0xffffff) | hash;
  return(hash);
}</pre>
Note that names inside CAT from MtG can be brute forced by template:

yyyyz.wvl

where:

yyyy - number from 0000 till 9999

z - one of the character from list: 'abcdeftx'

This last character (z) may or may not exists, so first you should try all names from '0000.wvl' till '9999.wvl' and only if none of them match try '0000a.wvl' - '9999a.wvl', '0000b.wvl' - '9999b.wvl' and so on.

=== MultiEx BMS Script === 

<pre>ImpType Standard ;
Get FN Long 0 ;
For T = 1 To FN ;
Get FID Long 0 ;
SavePos FOO 0 ;
Get FO Long 0 ;
SavePos FSO 0 ;
Get FS Long 0 ;
Log "" FO FS FOO FSO ;
Next T ;
</pre>

Extended version:

<pre># QucikBMS script for unpacking .CAT files
ImpType Standard
Get FileCount Long
For I = 1 To FileCount
  Get FileHash Long
  Get FileOffs Long
  Get FileSize Long
  SavePos TOC
  String FileName p= "%08X" FileHash
# read signature
  GoTo FileOffs
  Get FileHash Long
# .PCX files (Gunship!)
  If FileHash = 0x0801050A Then
    String FileName += ".PCX"
  EndIf
# .WVL files (Magic: The Gathering)
  If FileHash = 0x00000100 Then
    String FileName += ".WVL"
  EndIf
  Log FileName FileOffs FileSize
  GoTo TOC
Next I</pre>

=== Compatible Programs === 

* [[Game Extractor|Game Extractor]]
* [[MultiEx_Commander|MultiEx Commander]]
* [http://www.ctpax-x.ru/?goto=files&show=109 Magic: The Gathering image decoding tools] (with Delphi source codes)

=== Other Games === 

These games also use this file format<br>
* Gunship!
* Magic: The Gathering