493f89e577
We had several defines around the code base that were not very descriptive. Additionally, we had a patch of extra runtime restrictions living in oss-fuzz that were applied when fuzzing over there for some fuzzers. This has all be consolidated and controlled via the defines documented in site/dev/testing/fuzz.md As such, we can remove one of the patches that is in oss-fuzz, taking us closer to being able to fuzz in the CI/CQ. PS 1 renames existing fuzz defines to the new schema. PS 2-3 backports skia.diff from oss-fuzz and changes those definitions to have the _GREATLY modifier. PS 5+ further condenses the defines so that there is one define for gating the runtime checks. Change-Id: Ia4ad96f30c1e9620a2123b510e97c6f501a2e257 Docs-Preview: https://skia.org/?cl=316443 Bug: skia:10713 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/316443 Commit-Queue: Kevin Lubick <kjlubick@google.com> Reviewed-by: Mike Klein <mtklein@google.com>
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
/*
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* Copyright 2018 Google, LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "include/codec/SkCodec.h"
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#include "include/core/SkBitmap.h"
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#include "include/core/SkData.h"
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bool FuzzIncrementalImageDecode(sk_sp<SkData> bytes) {
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auto codec = SkCodec::MakeFromData(bytes);
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if (!codec) {
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return false;
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}
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SkBitmap bm;
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if (!bm.tryAllocPixels(codec->getInfo())) {
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// May fail in memory-constrained fuzzing environments
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return false;
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}
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auto result = codec->startIncrementalDecode(bm.info(), bm.getPixels(), bm.rowBytes());
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if (result != SkCodec::kSuccess) {
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return false;
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}
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// Deliberately uninitialized to verify that incrementalDecode initializes it when it
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// returns kIncompleteInput or kErrorInInput.
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int rowsDecoded;
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result = codec->incrementalDecode(&rowsDecoded);
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switch (result) {
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case SkCodec::kIncompleteInput:
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case SkCodec::kErrorInInput:
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if (rowsDecoded < bm.height()) {
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void* dst = SkTAddOffset<void>(bm.getPixels(), rowsDecoded * bm.rowBytes());
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sk_bzero(dst, (bm.height() - rowsDecoded) * bm.rowBytes());
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}
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return true; // decoded a partial image
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case SkCodec::kSuccess:
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return true;
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default:
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return false;
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}
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}
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#if defined(SK_BUILD_FOR_LIBFUZZER)
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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if (size > 10240) {
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return 0;
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}
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auto bytes = SkData::MakeWithoutCopy(data, size);
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FuzzIncrementalImageDecode(bytes);
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return 0;
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}
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#endif
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