Don't use SVG resource documents with an unrecognized MIME-type

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

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 14 matching lines @@
 */
 
 #include "core/fetch/CSSStyleSheetResource.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/ResourceClientWalker.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/fetch/StyleSheetResourceClient.h"
 #include "platform/SharedBuffer.h"
-#include "platform/network/HTTPParsers.h"
 #include "wtf/CurrentTime.h"
 
 namespace blink {
 
 PassRefPtrWillBeRawPtr<CSSStyleSheetResource> CSSStyleSheetResource::fetch(FetchRequest& request, ResourceFetcher* fetcher)
 {
     ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone);
     request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextStyle);
     return toCSSStyleSheetResource(fetcher->requestResource(request, CSSStyleSheetResourceFactory()));
 }
@@ skipping 52 matching lines @@
     if (!m_data || m_data->isEmpty() || !canUseSheet(mimeTypeCheck))
         return String();
 
     if (!m_decodedSheetText.isNull())
         return m_decodedSheetText;
 
     // Don't cache the decoded text, regenerating is cheap and it can use quite a bit of memory
     return decodedText();
 }
 
-const AtomicString CSSStyleSheetResource::mimeType() const
-{
-    return extractMIMETypeFromMediaType(response().httpHeaderField(HTTPNames::Content_Type)).lower();
-}
-
 void CSSStyleSheetResource::checkNotify()
 {
     // Decode the data to find out the encoding and keep the sheet text around during checkNotify()
     if (m_data)
         m_decodedSheetText = decodedText();
 
     ResourceClientWalker<StyleSheetResourceClient> w(m_clients);
     while (StyleSheetResourceClient* c = w.next())
         c->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this);
     // Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
@@ skipping 23 matching lines @@
 
     // This check exactly matches Firefox. Note that we grab the Content-Type
     // header directly because we want to see what the value is BEFORE content
     // sniffing. Firefox does this by setting a "type hint" on the channel.
     // This implementation should be observationally equivalent.
     //
     // This code defaults to allowing the stylesheet for non-HTTP protocols so
     // folks can use standards mode for local HTML documents.
     if (mimeTypeCheck == MIMETypeCheck::Lax)
         return true;
-    return mimeType().isEmpty() || equalIgnoringCase(mimeType(), "text/css") || equalIgnoringCase(mimeType(), "application/x-unknown-content-type");
+    AtomicString contentType = httpContentType();
+    return contentType.isEmpty() || equalIgnoringCase(contentType, "text/css") || equalIgnoringCase(contentType, "application/x-unknown-content-type");
 }
 
 PassRefPtrWillBeRawPtr<StyleSheetContents> CSSStyleSheetResource::restoreParsedStyleSheet(const CSSParserContext& context)
 {
     if (!m_parsedStyleSheetCache)
         return nullptr;
     if (m_parsedStyleSheetCache->hasFailedOrCanceledSubresources()) {
         m_parsedStyleSheetCache->removedFromMemoryCache();
         m_parsedStyleSheetCache.clear();
         return nullptr;
@@ skipping 17 matching lines @@
 
     if (m_parsedStyleSheetCache)
         m_parsedStyleSheetCache->removedFromMemoryCache();
     m_parsedStyleSheetCache = sheet;
     m_parsedStyleSheetCache->addedToMemoryCache();
 
     setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());
 }
 
 } // namespace blink