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https://github.com/RGBCube/serenity
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58838db445
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.
26 lines
662 B
C++
26 lines
662 B
C++
/*
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* Copyright (c) 2024, Nico Weber <thakis@chromium.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/ImageFormats/JBIG2Loader.h>
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// Spec: ITU-T_T_88__08_2018.pdf in the zip file here:
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// https://www.itu.int/rec/T-REC-T.88-201808-I
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namespace Gfx {
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bool JBIG2ImageDecoderPlugin::sniff(ReadonlyBytes data)
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{
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// JBIG2 spec, Annex D, D.4.1 ID string
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u8 id_string[] = { 0x97, 0x4A, 0x42, 0x32, 0x0D, 0x0A, 0x1A, 0x0A };
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return data.starts_with(id_string);
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}
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ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> JBIG2ImageDecoderPlugin::create(ReadonlyBytes)
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{
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return Error::from_string_view("FIXME: Draw the rest of the owl"sv);
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}
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}
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