Meta+Tests: Add a fuzzer and a test for the ILBM decoder

Meta/Lagom/Fuzzers/FuzzILBMLoader.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2023, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibGfx/ImageFormats/ILBMLoader.h>
+#include <stdio.h>
+
+extern "C" int LLVMFuzzerTestOneInput(uint8_t const* data, size_t size)
+{
+    auto decoder_or_error = Gfx::ILBMImageDecoderPlugin::create({ data, size });
+    if (decoder_or_error.is_error())
+        return 0;
+    auto decoder = decoder_or_error.release_value();
+    (void)decoder->frame(0);
+    return 0;
+}

Meta/Lagom/Fuzzers/fuzzers.cmake

@@ -16,6 +16,7 @@ set(FUZZER_TARGETS
     HttpRequest
     ICCProfile
     ICOLoader
+    ILBMLoader
     IMAPParser
     JPEGLoader
     Js
@@ -86,6 +87,7 @@ set(FUZZER_DEPENDENCIES_HebrewDecoder LibTextCodec)
 set(FUZZER_DEPENDENCIES_HttpRequest LibHTTP)
 set(FUZZER_DEPENDENCIES_ICCProfile LibGfx)
 set(FUZZER_DEPENDENCIES_ICOLoader LibGfx)
+set(FUZZER_DEPENDENCIES_ILBMLoader LibGfx)
 set(FUZZER_DEPENDENCIES_IMAPParser LibIMAP)
 set(FUZZER_DEPENDENCIES_JPEGLoader LibGfx)
 set(FUZZER_DEPENDENCIES_Js LibJS)

Tests/LibGfx/TestImageDecoder.cpp

@@ -10,6 +10,7 @@
 #include <LibGfx/ImageFormats/BMPLoader.h>
 #include <LibGfx/ImageFormats/GIFLoader.h>
 #include <LibGfx/ImageFormats/ICOLoader.h>
+#include <LibGfx/ImageFormats/ILBMLoader.h>
 #include <LibGfx/ImageFormats/ImageDecoder.h>
 #include <LibGfx/ImageFormats/JPEGLoader.h>
 #include <LibGfx/ImageFormats/JPEGXLLoader.h>
@@ -88,6 +89,15 @@ TEST_CASE(test_bmp_embedded_in_ico)
     expect_single_frame(*plugin_decoder);
 }
 
+TEST_CASE(test_ilbm)
+{
+    auto file = MUST(Core::MappedFile::map(TEST_INPUT("ilbm/gradient.iff"sv)));
+    EXPECT(Gfx::ILBMImageDecoderPlugin::sniff(file->bytes()));
+    auto plugin_decoder = MUST(Gfx::ILBMImageDecoderPlugin::create(file->bytes()));
+
+    expect_single_frame_of_size(*plugin_decoder, { 320, 200 });
+}
+
 TEST_CASE(test_jpeg_sof0_one_scan)
 {
     auto file = MUST(Core::MappedFile::map(TEST_INPUT("jpg/rgb24.jpg"sv)));

Userland/Utilities/test-fuzz.cpp

@@ -30,6 +30,7 @@
     T(HttpRequest)           \
     T(ICCProfile)            \
     T(ICOLoader)             \
+    T(ILBMLoader)            \
     T(IMAPParser)            \
     T(JPEGLoader)            \
     T(Js)                    \