Make multipart/x-mixed-replace parser more robust

third_party/WebKit/Source/core/fetch/ImageResourceTest.cpp

 /*
  * Copyright (c) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 105 matching lines @@
     ASSERT_FALSE(cachedImage->resourceBuffer());
     ASSERT_FALSE(cachedImage->hasImage());
     ASSERT_EQ(client.imageChangedCount(), 0);
     ASSERT_FALSE(client.notifyFinishedCalled());
     EXPECT_EQ("image/svg+xml", cachedImage->response().mimeType());
 
     const char secondPart[] = "<svg xmlns='http://www.w3.org/2000/svg' width='1' height='1'><rect width='1' height='1' fill='green'/></svg>\n";
     // The first bytes arrive. The data buffer is created, but no image is created.
     cachedImage->appendData(secondPart, strlen(secondPart));
     ASSERT_TRUE(cachedImage->resourceBuffer());
-    ASSERT_EQ(cachedImage->resourceBuffer()->size(), strlen(secondPart));
     ASSERT_FALSE(cachedImage->hasImage());
     ASSERT_EQ(client.imageChangedCount(), 0);
     ASSERT_FALSE(client.notifyFinishedCalled());
 
+    const char thirdPart[] = "--boundary";
+    cachedImage->appendData(thirdPart, strlen(thirdPart));
+    ASSERT_TRUE(cachedImage->resourceBuffer());
+    ASSERT_EQ(cachedImage->resourceBuffer()->size(), strlen(secondPart) - 1);
+
     // This part finishes. The image is created, callbacks are sent, and the data buffer is cleared.
     cachedImage->finish();
     ASSERT_FALSE(cachedImage->resourceBuffer());
     ASSERT_FALSE(cachedImage->errorOccurred());
     ASSERT_TRUE(cachedImage->hasImage());
     ASSERT_FALSE(cachedImage->getImage()->isNull());
     ASSERT_EQ(cachedImage->getImage()->width(), 1);
     ASSERT_EQ(cachedImage->getImage()->height(), 1);
     ASSERT_EQ(client.imageChangedCount(), 1);
     ASSERT_TRUE(client.notifyFinishedCalled());
@@ skipping 117 matching lines @@
     cachedImage->appendData(reinterpret_cast<const char*>(jpeg.data()), jpeg.size());
     cachedImage->finish();
     ASSERT_FALSE(cachedImage->errorOccurred());
     ASSERT_TRUE(cachedImage->hasImage());
     ASSERT_FALSE(cachedImage->getImage()->isNull());
     ASSERT_TRUE(client.notifyFinishedCalled());
     ASSERT_TRUE(cachedImage->getImage()->isBitmapImage());
 }
 
 } // namespace blink