MDT (Gotcha Force): Difference between revisions

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This article is about Gotcha Force MDT file format and ongoing researchs on it.

This section is currently being written.

More research is needed and some paragraphs may be wrong.

MDT files are same than pzz but packing only uncompressed files.

MDT header (0x800 bytes):

4 bytes - uint32 file count (big endian)
4 bytes - uint32 array: file size divided by 0x800 and upper rounded for each file

All .mdt contains 2 files:

000 dat file with texts used in the game
001 TPL including an alphanumeric alphabet used by the dat file

dat file:

header:

4 bytes - paragraph_offsets_blocks_list
4 bytes - symbols_count # number of symbols contained in the tpl
2 bytes - offsets in the file relative to after the header (array)? same count than symbols

paragraph_offsets_blocks_list:

4 bytes - uint32 absolute offsets - array of paragraph_offsets_block terminated by -1 (FF FF FF FF)

paragraph_offsets_block 0: # first paragraph_offsets_block describing all paragraph offsets in the data block 0

4 bytes - int32 array of absolute offsets which point to pragraphs in the data block terminated by -1 (FF FF FF FF). The first offset is the data block offset.

data_block 0:

2 bytes - signed int16 list <- paragraph_offsets_block 0 describe where each paragraph begin.

paragraph_offsets_block 1: ... data_block 1: ...

data_block contains int16 indexes relative to the tpl symbol list. First symbol in the tpl has number 0 then horizontaly symbol 1, 2 ... So data block(s) contains texts.

FFFE: space
1000: new line
1001: end of the phrase
80yy: start appliying a color to following letters
80FF: stop appliying a color
8002: use the player name

Virtual World RE has developed the python script pzztool.py to manipulate MDT files and their internal files allowing to unpack / pack mdt files.

@@ Line 21: / Line 21: @@
 '''header''':
-* 4 bytes - text_offsets_block_list
+* 4 bytes - paragraph_offsets_blocks_list
 * 4 bytes - symbols_count # number of symbols contained in the tpl
 * 2 bytes - offsets in the file relative to after the header (array)? same count than symbols
-'''text_offsets_block_list''':
+'''paragraph_offsets_blocks_list''':
-* 4 bytes - uint32 absolute offsets - array of the text_offsets_block terminated by -1 (FF FF FF FF)
+* 4 bytes - uint32 absolute offsets - array of paragraph_offsets_block terminated by -1 (FF FF FF FF)
-'''paragraph_offset_block 0''': # first text_offsets_block describing all texts offsets in the data block 0
+'''paragraph_offsets_block 0''': # first paragraph_offsets_block describing all paragraph offsets in the data block 0
-* 4 bytes - int32 array of absolute offsets - texts in the data block terminated by -1 (FF FF FF FF). The first offset is the data block offset
+* 4 bytes - int32 array of absolute offsets which point to pragraphs in the data block terminated by -1 (FF FF FF FF). The first offset is the data block offset.
 '''data_block 0''':
-* 2 bytes - signed int16 list <- text_offsets_block 0 describe where each text begin
+* 2 bytes - signed int16 list <- paragraph_offsets_block 0 describe where each paragraph begin.
-text_offsets_block 1: ...
+paragraph_offsets_block 1: ...
 data_block 1: ...
 data_block contains int16 indexes relative to the tpl symbol list. First symbol in the tpl has number 0 then horizontaly symbol 1, 2 ... So data block(s) contains texts.
 * FFFE: space
+* 1000: new line
 * 1001: end of the phrase
+* 80yy: start appliying a color to following letters
+* 80FF: stop appliying a color
+* 8002: use the player name
 Virtual World RE has developed the python script [https://github.com/Virtual-World-RE/NeoGF/tree/main/pzztool pzztool.py] to manipulate MDT files and their internal files allowing to unpack / pack mdt files.