Puma Street Soccer PPM
(→Format details) |
m (→Format details) |
||
| Line 14: | Line 14: | ||
P.S.S. PPM is structurally the same as Netpbm PPM, except that the signature is "<code>PX</code>" instead of "<code>P6</code>". | P.S.S. PPM is structurally the same as Netpbm PPM, except that the signature is "<code>PX</code>" instead of "<code>P6</code>". | ||
| − | The images are lightly | + | The images are lightly encrypted with a repeating 255-byte ''xor'' key. The key can be found in some files that have a sufficient number of consecutive black pixels (such as the end of {{DiscMasterLink|view/22881/PC%20Action%20Issue%2080%20(Estate%201999).ISO/puma%20street%20soccer/data1.cab/Program_Executable_Files/data/texture_3d/Creol/_Thand_s.ppm|this file}}), or generated. The first key byte is 0xb5. To derive the next byte, right-shift the current byte by 1 bit, then if the bit that was shifted off was 1, xor with 0xb8. |
== Identification == | == Identification == | ||
Revision as of 14:48, 23 November 2025
Puma Street Soccer is a video game developed by Pixelstorm. It has an associated .PPM texture graphics format.
P.S.S. PPM is a variant of Netpbm binary PPM (P6) format.
It's not certain that this format is specific to Puma Street Soccer, but no other use has been found.
Format details
P.S.S. PPM is structurally the same as Netpbm PPM, except that the signature is "PX" instead of "P6".
The images are lightly encrypted with a repeating 255-byte xor key. The key can be found in some files that have a sufficient number of consecutive black pixels (such as the end of this file), or generated. The first key byte is 0xb5. To derive the next byte, right-shift the current byte by 1 bit, then if the bit that was shifted off was 1, xor with 0xb8.
Identification
Files start with ASCII "PX", followed by a newline (0x0a).
In practice, the second line always seems to be a comment line. The following examples have been observed:
# Created by Paint Shop Pro # Created by Paint Shop Pro 5 # Created by Jasc BatchMaster # Created by Jasc Image Robot
It seems likely that these comments are misleading.
Sample files
- Puma Street Soccer 1.1 demo for Windows 95: PC Action Issue 80 → Puma Street Soccer/DATA1.CAB → Program_Executable_Files/data/texture_3d/...
- DiscMaster search
