Fox Standard Test Pattern

Abstract

The Fox Standard Test Pattern was developed to provide a distinct pattern for debugging. It has characterful technical and visual properties, combined with a small size of 64 bytes, that is still compressible.

Definition

1. The marker FOX followed by a 0x0A linebreak.
2. The pattern 0123 followed by a 0x20 space.
3. The character U repeated 47 times followed by a 0x20 space.
4. The count 47 followed by an ! exclamation mark, then a 0x0A linebreak.
5. The marker XOF marking the end of file.

Annex I: Example as regular expression

FOX\n0123 U{47} 47!\nXOF

Annex II: Example in ASCII text format

FOX
0123 UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU 47!
XOF

Annex III: Example in canonical hex format

00000000  46 4f 58 0a 30 31 32 33  20 55 55 55 55 55 55 55  |FOX.0123 UUUUUUU|
00000010  55 55 55 55 55 55 55 55  55 55 55 55 55 55 55 55  |UUUUUUUUUUUUUUUU|
00000020  55 55 55 55 55 55 55 55  55 55 55 55 55 55 55 55  |UUUUUUUUUUUUUUUU|
00000030  55 55 55 55 55 55 55 55  20 34 37 21 0a 58 4f 46  |UUUUUUUU 47!.XOF|