ppm/FILEFORMATS at master · vhelin/ppm · GitHub

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 project-file:
 *************

 bytes

   4      header, currently "PPMR".
   x      x-1 bytes of tile-file name, 0 terminated.
   y      y-1 bytes of map-file name, 0 terminated.
   z      z-1 bytes of metatile library-file name, 0 terminated.


 tile-file:
 **********

 bytes

   4      header, currently "PPM0".
 8*4*3    eight palettes of four colors, each consisting of R, G and B.
 32*32    tile palette data.
256*256   tile data in chunky pixel format.


 map-file:
 *********

 bytes

   4      header, currently "MEL0".
   4      map x.
   4      map y.
 x*y*2    tile id.
  x*y     tile property bytes.


 metatile-file:
 **************

 bytes

   4      header, currently "PPMM".
   4      amount of metatiles.
  ...
   4      t1, t2, t3 and t4.
   4      p1, p2, p3 and p4.
  ...