1 These are miscellaneous tests of my own division.

2 _

3 hello_world

4 The quick brown fox jumps over the lazy doggerel.txt

5 well ? then _ . __ how about this ?

6 Once upon a time there was a file name sanitiser; it was a good file name sanitiser, and never exposed security vulnerabilities to the World. “It’s a dangerous place,” its grand. “If a wolf should come out of the forest, then what would you do?”

7 (Some Peter and the Wolf snuck in there.)

8 .hidden

9 C:\WINDOWS\system32\driver\etc\hosts

10 %WINDIR%\system32\driver\etc\hosts

11 Kinda funny how Windows has a /etc/hosts.

12 .

13 ..

14 ...

15 ....

16 /././././././

17 . .. . . . .. ..

18 I’m basically just typing random stuff here.

19 OK, time for some more serious stuff.

20 _

21 For Unicode paths, some file systems limit paths to roughly 255 UTF-8 code units, others to roughly 255 UTF-16 code units. UTF-8 is the tighter of these restrictions in all circumstances: UTF-16 uses one code unit until U+F. Now then: one-byte characters:

22 # One-byte characters:

23 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345

24 12345678901234567890.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz

25 123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678.abcdefghijklmnopqrstuvwxyz

26 # Two-byte characters:

27 áɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠ.

28 áɓç.°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³

29 áɓçđéƒɠ.°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³

30 áɓçđéƒɠɦïķá.°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³°¹²³

31 áɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓçđéƒɠɦïķáɓç.°¹²³

32 # Three-byte characters:

33 ‐‑‒–—―‖‗‘’‚‛“”„‟†‡•‣․‥…‧‐‑‒–—―‖‗‘’‚‛“”„‟†‡•‣․‥…‧‐‑‒–—―‖‗‘’‚‛“”„‟†‡•‣․‥…‧‐‑‒–—―‖‗‘’‚‛“

34 ‐‑‒–—.₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉₀₁₂₃₄₅₆₇₈₉

35 ‐‑‒–—―‖‗‘’‚‛“”„‟†‡•‣․‥…‧‐‑‒–—―‖‗‘’‚‛“”„‟†‡•‣․‥…‧‐‑‒–—―‖‗‘’‚‛“”„‟†‡•‣․‥…‧‐‑.₁₂₃₄₅₆₇₈₉₀

36 # Four-byte characters:

37 𐀀𐀁𐀂𐀃𐀄𐀅𐀆𐀇𐀈𐀉𐀊𐀋𐀍𐀎𐀏𐀐𐀑𐀒𐀓𐀔𐀕𐀖𐀗𐀘𐀙𐀚𐀛𐀜𐀝𐀞𐀟𐀠𐀡𐀢𐀣𐀤𐀥𐀦𐀨𐀩𐀪𐀫𐀬𐀭𐀮𐀯𐀰𐀱𐀲𐀳𐀴𐀵𐀶𐀷𐀸𐀹𐀺𐀼𐀽𐀿𐁀𐁁𐁂.

38 𐀀𐀁𐀂𐀃𐀄𐀅𐀆.𐂀𐂁𐂂𐂃𐂄𐂅𐂆𐂇𐂈𐂉𐂊𐂋𐂌𐂍𐂀𐂁𐂂𐂃𐂄𐂅𐂆𐂇𐂈𐂉𐂊𐂋𐂌𐂍𐂀𐂁𐂂𐂃𐂄𐂅𐂆𐂇𐂈𐂉𐂊𐂋𐂌𐂍𐂀𐂁𐂂𐂃𐂄𐂅𐂆𐂇𐂈𐂉𐂊𐂋𐂌𐂍

39 𐀀𐀁𐀂𐀃𐀄𐀅𐀆𐀇𐀈𐀉𐀊𐀋𐀍𐀎𐀏𐀐𐀑𐀒𐀓𐀔𐀕𐀖𐀗𐀘𐀙𐀚𐀛𐀜𐀝𐀞𐀟𐀠𐀡𐀢𐀣𐀤𐀥𐀦𐀨𐀩𐀪𐀫𐀬𐀭𐀮𐀯𐀰𐀱𐀲.𐂀𐂁𐂂𐂃𐂄𐂅𐂆𐂇𐂈𐂉𐂊𐂋𐂌𐂍

40 _

41 abcdef.ghij

42 abcde.fghij

43 AUX.abcdef

44 lpT7.abcdef

45 cOm6.abcdef

46 CON

47 aux.h

48 Lpt1.exe

49 xyz

50 nül

51 COM1.jpg.png

52 _

53 Some sanitisers try stripping out ZWSP (​), which can be used as a fingerprinting vector and has no particularly legitimate purpose in a file name; I’m not, because removing it doesn’t solve the fingerprinting risk, as you can use ZWNJ and ZWJ (.)