a115942ed6
Instead of a single ASSERT macro, this switches to two new methods: - signalBug(): tell afl-fuzz there's a bug caused by its inputs (by crashing) - signalBoring(): tell afl-fuzz these inputs are not worth testing (by exiting gracefully) I'm not seeing any effect on fuzz/s when I just always log verbosely. signalBug() now triggers SIGSEGV rather than SIGABRT. This should make it work with catchsegv more easily. BUG=skia: GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1585353002 Review URL: https://codereview.chromium.org/1585353002
50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
/*
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* Copyright 2016 Google Inc.
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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 "Fuzz.h"
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#include <stdlib.h>
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// This really is just an example Fuzz*.cpp file.
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// It tests that two different ways of calculating the Paeth predictor function are equivalent.
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static uint8_t paeth_std(uint8_t a, uint8_t b, uint8_t c) {
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int p = a+b-c;
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int pa = abs(p-a),
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pb = abs(p-b),
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pc = abs(p-c);
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if (pb < pa) { pa = pb; a = b; }
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if (pc < pa) { a = c; }
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return a;
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}
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static uint8_t paeth_alt(uint8_t a, uint8_t b, uint8_t c) {
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int min = SkTMin(a,b),
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max = SkTMax(a,b);
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int delta = (max-min)/3;
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if (c <= min+delta) return max;
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if (c >= max-delta) return min;
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return c;
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}
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DEF_FUZZ(Paeth, fuzz) {
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auto a = fuzz->nextB(),
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b = fuzz->nextB(),
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c = fuzz->nextB();
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SkDebugf("Paeth(%d,%d,%d)\n", a,b,c);
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if (a == b && b == c) {
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fuzz->signalBoring(); // Not really boring, just demoing signalBoring().
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}
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if (paeth_alt(a,b,c) != paeth_std(a,b,c)) {
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fuzz->signalBug();
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}
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}
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