From e565450d0ba81a9869be79664126fd8517dc1632 Mon Sep 17 00:00:00 2001
From: kjlubick <kjlubick@google.com>
Date: Tue, 19 Jul 2016 16:50:03 -0700
Subject: Port FuzzPathop from chromium

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2148023002

Review-Url: https://codereview.chromium.org/2148023002
---
 fuzz/FuzzPathop.cpp | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 fuzz/FuzzPathop.cpp

(limited to 'fuzz/FuzzPathop.cpp')

diff --git a/fuzz/FuzzPathop.cpp b/fuzz/FuzzPathop.cpp
new file mode 100644
index 0000000000..fecf3ca914
--- /dev/null
+++ b/fuzz/FuzzPathop.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "Fuzz.h"
+#include "SkPath.h"
+#include "SkPathOps.h"
+
+const int kLastOp = SkPathOp::kReverseDifference_SkPathOp;
+
+void BuildPath(Fuzz* fuzz,
+               SkPath* path,
+               int last_verb) {
+  uint8_t operation;
+  SkScalar a, b, c, d, e, f;
+  while (fuzz->next<uint8_t>(&operation)) {
+
+    switch (operation % (last_verb + 1)) {
+      case SkPath::Verb::kMove_Verb:
+        if (!fuzz->next<SkScalar>(&a) || !fuzz->next<SkScalar>(&b))
+          return;
+        path->moveTo(a, b);
+        break;
+
+      case SkPath::Verb::kLine_Verb:
+        if (!fuzz->next<SkScalar>(&a) || !fuzz->next<SkScalar>(&b))
+          return;
+        path->lineTo(a, b);
+        break;
+
+      case SkPath::Verb::kQuad_Verb:
+        if (!fuzz->next<SkScalar>(&a) ||
+            !fuzz->next<SkScalar>(&b) ||
+            !fuzz->next<SkScalar>(&c) ||
+            !fuzz->next<SkScalar>(&d))
+          return;
+        path->quadTo(a, b, c, d);
+        break;
+
+      case SkPath::Verb::kConic_Verb:
+        if (!fuzz->next<SkScalar>(&a) ||
+            !fuzz->next<SkScalar>(&b) ||
+            !fuzz->next<SkScalar>(&c) ||
+            !fuzz->next<SkScalar>(&d) ||
+            !fuzz->next<SkScalar>(&e))
+          return;
+        path->conicTo(a, b, c, d, e);
+        break;
+
+      case SkPath::Verb::kCubic_Verb:
+        if (!fuzz->next<SkScalar>(&a) ||
+            !fuzz->next<SkScalar>(&b) ||
+            !fuzz->next<SkScalar>(&c) ||
+            !fuzz->next<SkScalar>(&d) ||
+            !fuzz->next<SkScalar>(&e) ||
+            !fuzz->next<SkScalar>(&f))
+          return;
+        path->cubicTo(a, b, c, d, e, f);
+        break;
+
+      case SkPath::Verb::kClose_Verb:
+        path->close();
+        break;
+
+      case SkPath::Verb::kDone_Verb:
+        // In this case, simply exit.
+        return;
+    }
+  }
+}
+
+DEF_FUZZ(Pathop, fuzz) {
+    SkOpBuilder builder;
+    while (fuzz->remaining() >= sizeof(uint8_t)) {
+        SkPath path;
+        uint8_t op = fuzz->nextB();
+
+        BuildPath(fuzz, &path, SkPath::Verb::kDone_Verb);
+        builder.add(path, static_cast<SkPathOp>(op % (kLastOp + 1)));
+    }
+
+    SkPath result;
+    builder.resolve(&result);
+}
-- 
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