Add pattern for JXL

[dxan29a]

Add a pattern for the JPEG XL file.
Reference:

• https://www.iso.org/standard/85253.html
• https://www.iso.org/standard/85253.html

[Mrmaxmeier]

Can you move this logic to Box or Header? 🙂

if (lbox == 1) {
  size = xlbox - 16;
} else {
  size = lbox - 8;
}

[dxan29a]

Hi @Mrmaxmeier, thanks for the advice! I was thinking that this way could explicitly show the field name in each different box instead of a general field name for each box. I believe it should be implemented in an elegant code style, but this is what I came up with. What do you think?

[WerWolv]

Thanks a lot for the pattern! There seems to be some issue still when running the pattern on test file though. I don't know enough about the format really though. Here's the log from the CI

Executing pattern jxl.hexpat using test file jxl.hexpat.jxl
    [ERROR] [ Stack Trace ]
    [ERROR] <Source Code>:119:36 at address 0x0008
    [ERROR] 119 |         u8 remaining_bytes[lbox - 8];
                                         ^
    [ERROR] <Source Code>:120:5 at address 0x0008
    [ERROR] 120 |     }
          ^
    [ERROR] <Source Code>:115:8 at address 0x0008
    [ERROR] 115 | struct UnknownBox<auto lbox,
              ^^^^^^^^^^
    [ERROR] <Source Code>:136:45 at address 0x0008
    [ERROR] 136 |                    UnknownBox<header.lbox,
                          ^^^^^^^^^^
    [ERROR] <Source Code>:137:5 at address 0x0008
    [ERROR] 137 |     }
          ^
    [ERROR] <Source Code>:123:8 at address 0x0000
    [ERROR] 123 | struct Box {
             ^^^
    [ERROR] <Source Code>:140:1 at address 0x0000
    [ERROR] 140 | Box boxes[while(!std::mem::eof(
       ^^^
    [ERROR] Error happened with cursor at address 0xFF0A0054
    [ERROR] 

    [ERROR] runtime error: Array expanded past end of the data.
  -->   in <Source Code>:119:36
119 |         u8 remaining_bytes[lbox - 8];
                                         ^
Error when executing pattern!
119:36  runtime error: Array expanded past end of the data.
  -->   in <Source Code>:119:36
119 |         u8 remaining_bytes[lbox - 8];
                                         ^