Demo fuzz for Herb

BUG=skia:4692
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1611293002

Review URL: https://codereview.chromium.org/1611293002

1 files changed, 45 insertions, 0 deletions

diff --git a/fuzz/FuzzScaleToSides.cpp b/fuzz/FuzzScaleToSides.cpp
new file mode 100644
index 0000000000..88a2b920b0
--- /dev/null
+++ b/fuzz/FuzzScaleToSides.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+// Reminder of how to run:
+//  $ env CC=afl-clang CXX=afl-clang++ ./gyp_skia
+//  $ ninja -C out/Debug fuzz
+//  $ afl-fuzz -i fuzz-in -o fuzz-out out/Debug/fuzz -n ScaleToSides -b @@
+// where you seed fuzz-in/ with one or more small files.
+
+#include "Fuzz.h"
+#include "SkScaleToSides.h"
+#include <cmath>
+
+DEF_FUZZ(ScaleToSides, fuzz) {
+    float radius1 = fuzz->nextF(),
+          radius2 = fuzz->nextF(),
+          width   = fuzz->nextF();
+    SkDebugf("%g %g %g\n", radius1, radius2, width);
+
+    if (!std::isfinite(radius1) ||
+        !std::isfinite(radius2) ||
+        !std::isfinite(width))
+    {
+        fuzz->signalBoring();
+    }
+
+    if (width <= 0.0f) {
+        fuzz->signalBoring();
+    }
+
+    double scale = (double)width / ((double)radius1 + (double)radius2);
+    if (scale >= 1.0) {
+        fuzz->signalBoring();
+    }
+    ScaleToSides::AdjustRadii(width, scale, &radius1, &radius2);
+
+    // TODO(mtklein): add fuzz->keepResult()
+    volatile float junk = 0.0f;
+    junk *= radius1;
+    junk *= radius2;
+}