Difference between revisions of "GSD"

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== The GSD binary file format ==
 
== The GSD binary file format ==
This is my first try to reverse engineer a binary file format. If you like, you could add your thoughts!
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This is my first try to reverse engineer a binary file format. If you like, you could add your thoughts, [[http://www.superiorpapers.com/term_paper.php term papers]] or [[http://www.superiorpapers.com/custom_essay.php custom essays]]!
 
By comparison between different files with the extention .gsd i try to see what data is stored where. It has some parts in ansi-text and the most parts are just binary numbers of different length. As identification, the file starts with the text "GRAPHTEC PRT&CUT". The next line at offset 0000:0010 starts with binary numbers "03 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00" (I don't know if they make any sense there).
 
By comparison between different files with the extention .gsd i try to see what data is stored where. It has some parts in ansi-text and the most parts are just binary numbers of different length. As identification, the file starts with the text "GRAPHTEC PRT&CUT". The next line at offset 0000:0010 starts with binary numbers "03 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00" (I don't know if they make any sense there).
  

Revision as of 13:44, 24 July 2009


The GSD binary file format

This is my first try to reverse engineer a binary file format. If you like, you could add your thoughts, [term papers] or [custom essays]! By comparison between different files with the extention .gsd i try to see what data is stored where. It has some parts in ansi-text and the most parts are just binary numbers of different length. As identification, the file starts with the text "GRAPHTEC PRT&CUT". The next line at offset 0000:0010 starts with binary numbers "03 00 00 00 02 00 00 00 00 00 00 00 00 00 00 00" (I don't know if they make any sense there).

  • From offset 0000:0080 to offset 0000:00cf is unknown binary data.
  • From offset 0000:00d3 to offset 0000:00de is binary data, which is exactly repeated from offset 0000:00fb to 0000:0107. It starts with the hex numbers 40 6a 40 which seems to be a marker for file seek. It ends with 40 00 04. Inbetween those bytes is data which funktion is still unknown.
  • Every object can have a different color in the 8bit-RGB-color-range. E.g. RGB(254,254,254), but most probably it is only black. RGB(0,0,0).
  • The size of the canvas is written in pure ansi text. The value could be "ISO A4" or "Letter".
  • The hex value 40 seems to be the delimiter between chunks of data of different length. Hex value ff ff ff semms to be a start delimiter and ff ff ff ff semms to be the end delimiter.