Adding new fuzzer deserialization test code

skia/tools/filter_fuzz_stub/filter_fuzz_stub.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "third_party/skia/include/core/SkBitmapDevice.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkFlattenableSerialization.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
+
+namespace {
+
+static const int BitmapSize = 24;
+
+bool ReadTestCase(const char* filename, std::string* ipc_filter_message) {
+  base::FilePath filepath = base::FilePath::FromUTF8Unsafe(filename);
+
+  if (!base::ReadFileToString(filepath, ipc_filter_message)) {
+    LOG(ERROR) << filename << ": couldn't read file.";
+    return false;
+  }
+
+  return true;
+}
+
+void RunTestCase(std::string& ipc_filter_message, SkBitmap& bitmap,
+                 SkCanvas* canvas) {
+  // This call shouldn't crash or cause ASAN to flag any memory issues
+  // If nothing bad happens within this call, everything is fine
+  SkFlattenable* flattenable = SkValidatingDeserializeFlattenable(
+        ipc_filter_message.c_str(), ipc_filter_message.size(),
+        SkImageFilter::GetFlattenableType());
+
+  // Adding some info, but the test passed if we got here without any trouble
+  if (flattenable != NULL) {
+    LOG(INFO) << "Valid stream detected.";
+    // Let's see if using the filters can cause any trouble...
+    SkPaint paint;
+    paint.setImageFilter(static_cast<SkImageFilter*>(flattenable))->unref();
+    canvas->save();
+    canvas->clipRect(SkRect::MakeXYWH(
+        0, 0, SkIntToScalar(BitmapSize), SkIntToScalar(BitmapSize)));
+
+    // This call shouldn't crash or cause ASAN to flag any memory issues
+    // If nothing bad happens within this call, everything is fine
+    canvas->drawBitmap(bitmap, 0, 0, &paint);
+
+    LOG(INFO) << "Filter DAG rendered successfully";
+    canvas->restore();
+  } else {
+    LOG(INFO) << "Invalid stream detected.";
+  }
+}
+
+bool ReadAndRunTestCase(const char* filename, SkBitmap& bitmap,
+                        SkCanvas* canvas) {
+  std::string ipc_filter_message;
+
+  LOG(INFO) << "Test case: " << filename;
+
+  // ReadTestCase will print a useful error message if it fails.
+  if (!ReadTestCase(filename, &ipc_filter_message))
+    return false;
+
+  RunTestCase(ipc_filter_message, bitmap, canvas);
+
+  return true;
+}
+
+}
+
+int main(int argc, char** argv) {
+  int ret = 0;
+
+  SkBitmap bitmap;
+  bitmap.setConfig(SkBitmap::kARGB_8888_Config, BitmapSize, BitmapSize);
+  bitmap.allocPixels();
+  SkBitmapDevice device(bitmap);
+  SkCanvas canvas(&device);
+  canvas.clear(0x00000000);
+
+  for (int i = 1; i < argc; i++)
+    if (!ReadAndRunTestCase(argv[i], bitmap, &canvas))
+      ret = 2;
+
+  // Cluster-Fuzz likes "#EOF" as the last line of output to help distinguish
+  // successful runs from crashes.
+  printf("#EOF\n");
+
+  return ret;
+}
+