quickie tool to exercise chrome filter fuzz files

This is a quick Skia transcription of the Chromium tool at
src/skia/tools/filter_fuzz_stub.cc
to read and decode filters captured as .fil files.

R=joshualitt@google.com,mtklein@google.com,reed@google.com,robertphillips@google.com
BUG=487213

Review URL: https://codereview.chromium.org/1126423005

1 files changed, 82 insertions, 0 deletions

diff --git a/tools/chrome_fuzz.cpp b/tools/chrome_fuzz.cpp
new file mode 100644
index 0000000000..94d276fb9b
--- /dev/null
+++ b/tools/chrome_fuzz.cpp
@@ -0,0 +1,82 @@
+// Copyright 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 "SkCanvas.h"
+#include "SkFlattenableSerialization.h"
+#include "SkImageFilter.h"
+#include "SkOSFile.h"
+#include "SkString.h"
+
+static const int kBitmapSize = 24;
+
+static bool read_test_case(const char* filename, SkString* testdata) {
+  SkFILE* file = sk_fopen(filename, kRead_SkFILE_Flag);
+  if (!file) {
+    SkDebugf("couldn't open file %s\n", filename);
+    return false;
+  }
+  size_t len = sk_fgetsize(file);
+  if (!len) {
+    SkDebugf("couldn't read file %s\n", filename);
+    return false;
+  }
+  testdata->resize(len);
+  (void) sk_fread(testdata->writable_str(), len, file);
+  return true;
+}
+
+static void run_test_case(const SkString& testdata, const 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(
+        testdata.c_str(), testdata.size(), SkImageFilter::GetFlattenableType());
+
+  // Adding some info, but the test passed if we got here without any trouble
+  if (flattenable != NULL) {
+    SkDebugf("Valid stream detected.\n");
+    // 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(kBitmapSize), SkIntToScalar(kBitmapSize)));
+
+    // 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);
+
+    SkDebugf("Filter DAG rendered successfully.\n");
+    canvas->restore();
+  } else {
+    SkDebugf("Invalid stream detected.\n");
+  }
+}
+
+static bool read_and_run_test_case(const char* filename, const SkBitmap& bitmap,
+                        SkCanvas* canvas) {
+  SkString testdata;
+  SkDebugf("Test case: %s\n", filename);
+  // read_test_case will print a useful error message if it fails.
+  if (!read_test_case(filename, &testdata))
+    return false;
+  run_test_case(testdata, bitmap, canvas);
+  return true;
+}
+
+int main(int argc, char** argv) {
+  int ret = 0;
+  SkBitmap bitmap;
+  bitmap.allocN32Pixels(kBitmapSize, kBitmapSize);
+  SkCanvas canvas(bitmap);
+  canvas.clear(0x00000000);
+  for (int i = 1; i < argc; i++)
+    if (!read_and_run_test_case(argv[i], bitmap, &canvas))
+      ret = 2;
+  // Cluster-Fuzz likes "#EOF" as the last line of output to help distinguish
+  // successful runs from crashes.
+  SkDebugf("#EOF\n");
+  return ret;
+}
+