| /* |
| 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 |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public License |
| along with this library; see the file COPYING.LIB. If not, write to |
| the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. |
| |
| This class provides all functionality needed for loading images, style sheets and html |
| pages from the web. It has a memory cache for these objects. |
| */ |
| |
| #include "core/fetch/CSSStyleSheetResource.h" |
| |
| #include "core/css/StyleSheetContents.h" |
| #include "core/fetch/FetchRequest.h" |
| #include "core/fetch/MemoryCache.h" |
| #include "core/fetch/ResourceClientOrObserverWalker.h" |
| #include "core/fetch/ResourceFetcher.h" |
| #include "core/fetch/StyleSheetResourceClient.h" |
| #include "platform/SharedBuffer.h" |
| #include "wtf/CurrentTime.h" |
| |
| namespace blink { |
| |
| CSSStyleSheetResource* CSSStyleSheetResource::fetch(FetchRequest& request, ResourceFetcher* fetcher) |
| { |
| ASSERT(request.resourceRequest().frameType() == WebURLRequest::FrameTypeNone); |
| request.mutableResourceRequest().setRequestContext(WebURLRequest::RequestContextStyle); |
| return toCSSStyleSheetResource(fetcher->requestResource(request, CSSStyleSheetResourceFactory())); |
| } |
| |
| CSSStyleSheetResource* CSSStyleSheetResource::createForTest(const ResourceRequest& request, const String& charset) |
| { |
| return new CSSStyleSheetResource(request, ResourceLoaderOptions(), charset); |
| } |
| |
| CSSStyleSheetResource::CSSStyleSheetResource(const ResourceRequest& resourceRequest, const ResourceLoaderOptions& options, const String& charset) |
| : StyleSheetResource(resourceRequest, CSSStyleSheet, options, "text/css", charset) |
| { |
| } |
| |
| CSSStyleSheetResource::~CSSStyleSheetResource() |
| { |
| } |
| |
| void CSSStyleSheetResource::setParsedStyleSheetCache(StyleSheetContents* newSheet) |
| { |
| if (m_parsedStyleSheetCache) |
| m_parsedStyleSheetCache->clearReferencedFromResource(); |
| m_parsedStyleSheetCache = newSheet; |
| if (m_parsedStyleSheetCache) |
| m_parsedStyleSheetCache->setReferencedFromResource(this); |
| } |
| |
| DEFINE_TRACE(CSSStyleSheetResource) |
| { |
| visitor->trace(m_parsedStyleSheetCache); |
| StyleSheetResource::trace(visitor); |
| } |
| |
| void CSSStyleSheetResource::didAddClient(ResourceClient* c) |
| { |
| ASSERT(StyleSheetResourceClient::isExpectedType(c)); |
| // Resource::didAddClient() must be before setCSSStyleSheet(), |
| // because setCSSStyleSheet() may cause scripts to be executed, which could destroy 'c' if it is an instance of HTMLLinkElement. |
| // see the comment of HTMLLinkElement::setCSSStyleSheet. |
| Resource::didAddClient(c); |
| |
| if (!isLoading()) |
| static_cast<StyleSheetResourceClient*>(c)->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this); |
| } |
| |
| const String CSSStyleSheetResource::sheetText(MIMETypeCheck mimeTypeCheck) const |
| { |
| ASSERT(!isPurgeable()); |
| |
| 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(); |
| } |
| |
| 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. |
| m_decodedSheetText = String(); |
| } |
| |
| bool CSSStyleSheetResource::isSafeToUnlock() const |
| { |
| return m_data->hasOneRef(); |
| } |
| |
| void CSSStyleSheetResource::destroyDecodedDataIfPossible() |
| { |
| if (!m_parsedStyleSheetCache) |
| return; |
| |
| setParsedStyleSheetCache(nullptr); |
| setDecodedSize(0); |
| } |
| |
| bool CSSStyleSheetResource::canUseSheet(MIMETypeCheck mimeTypeCheck) const |
| { |
| if (errorOccurred()) |
| return false; |
| |
| // 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; |
| AtomicString contentType = httpContentType(); |
| return contentType.isEmpty() || equalIgnoringCase(contentType, "text/css") || equalIgnoringCase(contentType, "application/x-unknown-content-type"); |
| } |
| |
| StyleSheetContents* CSSStyleSheetResource::restoreParsedStyleSheet(const CSSParserContext& context) |
| { |
| if (!m_parsedStyleSheetCache) |
| return nullptr; |
| if (m_parsedStyleSheetCache->hasFailedOrCanceledSubresources()) { |
| setParsedStyleSheetCache(nullptr); |
| return nullptr; |
| } |
| |
| ASSERT(m_parsedStyleSheetCache->isCacheableForResource()); |
| ASSERT(m_parsedStyleSheetCache->isReferencedFromResource()); |
| |
| // Contexts must be identical so we know we would get the same exact result if we parsed again. |
| if (m_parsedStyleSheetCache->parserContext() != context) |
| return nullptr; |
| |
| didAccessDecodedData(); |
| |
| return m_parsedStyleSheetCache; |
| } |
| |
| void CSSStyleSheetResource::saveParsedStyleSheet(StyleSheetContents* sheet) |
| { |
| ASSERT(sheet && sheet->isCacheableForResource()); |
| |
| if (!memoryCache()->contains(this)) { |
| // This stylesheet resource did conflict with another resource and was |
| // not added to the cache. |
| setParsedStyleSheetCache(nullptr); |
| return; |
| } |
| setParsedStyleSheetCache(sheet); |
| setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes()); |
| } |
| |
| } // namespace blink |