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LibGfx: Add the start of a JBIG2 loader

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JBIG2 is infamous for two things:

1. It's used in xerox scanners were it falsifies scanned numbers:

https://www.dkriesel.com/en/blog/2013/0802_xerox-workcentres_are_switching_written_numbers_when_scanning

2. It was allegedly used in an iOS zero day, in a very cool way:

https://googleprojectzero.blogspot.com/2021/12/a-deep-dive-into-nso-zero-click.html

Needless to say, we need support for it in Serenity. (...because it's
used in PDF files.)

This adds all the scaffolding, but no actual implementation yet.

It's enough for `file` to print the mime type of .jb2 files, but `image`
can't do anything with the files yet.
This commit is contained in:
Nico Weber 2024-03-03 09:21:30 -05:00 • committed by Andreas Kling
parent d7ad134ae5
commit 58838db445
12 changed files with 86 additions and 22 deletions
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1
Userland/Libraries/LibCore/MimeData.cpp
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@ -124,6 +124,7 @@ static Array const s_registered_mime_type = {
MimeType { .name = "image/webp"sv, .common_extensions = { ".webp"sv }, .description = "WebP image data"sv, .magic_bytes = Vector<u8> { 'W', 'E', 'B', 'P' }, .offset = 8 },
MimeType { .name = "image/x-icon"sv, .common_extensions = { ".ico"sv }, .description = "ICO image data"sv },
MimeType { .name = "image/x-ilbm"sv, .common_extensions = { ".iff"sv, ".lbm"sv }, .description = "Interleaved bitmap image data"sv, .magic_bytes = Vector<u8> { 0x46, 0x4F, 0x52, 0x4F } },
MimeType { .name = "image/x-jbig2"sv, .common_extensions = { ".jbig2"sv, ".jb2"sv }, .description = "JBIG2 image data"sv, .magic_bytes = Vector<u8> { 0x97, 0x4A, 0x42, 0x32, 0x0D, 0x0A, 0x1A, 0x0A } },
MimeType { .name = "image/x-portable-arbitrarymap"sv, .common_extensions = { ".pam"sv }, .description = "PAM image data"sv, .magic_bytes = Vector<u8> { 0x50, 0x37, 0x0A } },
MimeType { .name = "image/x-portable-bitmap"sv, .common_extensions = { ".pbm"sv }, .description = "PBM image data"sv, .magic_bytes = Vector<u8> { 0x50, 0x31, 0x0A } },
MimeType { .name = "image/x-portable-graymap"sv, .common_extensions = { ".pgm"sv }, .description = "PGM image data"sv, .magic_bytes = Vector<u8> { 0x50, 0x32, 0x0A } },