2 Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
3 Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
4 Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
5 Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
6 Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
8 This library is free software; you can redistribute it and/or
9 modify it under the terms of the GNU Library General Public
10 License as published by the Free Software Foundation; either
11 version 2 of the License, or (at your option) any later version.
13 This library is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Library General Public License for more details.
18 You should have received a copy of the GNU Library General Public License
19 along with this library; see the file COPYING.LIB. If not, write to
20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA.
23 This class provides all functionality needed for loading images, style sheets and html
24 pages from the web. It has a memory cache for these objects.
28 #include "core/fetch/CSSStyleSheetResource.h"
30 #include "core/css/StyleSheetContents.h"
31 #include "core/fetch/ResourceClientWalker.h"
32 #include "core/fetch/StyleSheetResourceClient.h"
33 #include "platform/SharedBuffer.h"
34 #include "platform/network/HTTPParsers.h"
35 #include "wtf/CurrentTime.h"
39 CSSStyleSheetResource::CSSStyleSheetResource(const ResourceRequest& resourceRequest, const String& charset)
40 : StyleSheetResource(resourceRequest, CSSStyleSheet, "text/css", charset)
42 DEFINE_STATIC_LOCAL(const AtomicString, acceptCSS, ("text/css,*/*;q=0.1", AtomicString::ConstructFromLiteral));
44 // Prefer text/css but accept any type (dell.com serves a stylesheet
45 // as text/html; see <http://bugs.webkit.org/show_bug.cgi?id=11451>).
49 CSSStyleSheetResource::~CSSStyleSheetResource()
51 // Make sure dispose() was cllaed before destruction.
52 ASSERT(!m_parsedStyleSheetCache);
55 void CSSStyleSheetResource::dispose()
57 if (m_parsedStyleSheetCache)
58 m_parsedStyleSheetCache->removedFromMemoryCache();
59 m_parsedStyleSheetCache.clear();
62 void CSSStyleSheetResource::trace(Visitor* visitor)
64 visitor->trace(m_parsedStyleSheetCache);
65 StyleSheetResource::trace(visitor);
68 void CSSStyleSheetResource::didAddClient(ResourceClient* c)
70 ASSERT(c->resourceClientType() == StyleSheetResourceClient::expectedType());
71 // Resource::didAddClient() must be before setCSSStyleSheet(),
72 // because setCSSStyleSheet() may cause scripts to be executed, which could destroy 'c' if it is an instance of HTMLLinkElement.
73 // see the comment of HTMLLinkElement::setCSSStyleSheet.
74 Resource::didAddClient(c);
77 static_cast<StyleSheetResourceClient*>(c)->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this);
80 const String CSSStyleSheetResource::sheetText(bool enforceMIMEType, bool* hasValidMIMEType) const
82 ASSERT(!isPurgeable());
84 if (!m_data || m_data->isEmpty() || !canUseSheet(enforceMIMEType, hasValidMIMEType))
87 if (!m_decodedSheetText.isNull())
88 return m_decodedSheetText;
90 // Don't cache the decoded text, regenerating is cheap and it can use quite a bit of memory
94 void CSSStyleSheetResource::checkNotify()
96 // Decode the data to find out the encoding and keep the sheet text around during checkNotify()
98 m_decodedSheetText = decodedText();
100 ResourceClientWalker<StyleSheetResourceClient> w(m_clients);
101 while (StyleSheetResourceClient* c = w.next())
102 c->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), encoding(), this);
103 // Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
104 m_decodedSheetText = String();
107 bool CSSStyleSheetResource::isSafeToUnlock() const
109 return m_data->hasOneRef();
112 void CSSStyleSheetResource::destroyDecodedDataIfPossible()
114 if (!m_parsedStyleSheetCache)
117 m_parsedStyleSheetCache->removedFromMemoryCache();
118 m_parsedStyleSheetCache.clear();
123 bool CSSStyleSheetResource::canUseSheet(bool enforceMIMEType, bool* hasValidMIMEType) const
128 if (!enforceMIMEType && !hasValidMIMEType)
131 // This check exactly matches Firefox. Note that we grab the Content-Type
132 // header directly because we want to see what the value is BEFORE content
133 // sniffing. Firefox does this by setting a "type hint" on the channel.
134 // This implementation should be observationally equivalent.
136 // This code defaults to allowing the stylesheet for non-HTTP protocols so
137 // folks can use standards mode for local HTML documents.
138 const AtomicString& mimeType = extractMIMETypeFromMediaType(response().httpHeaderField("Content-Type"));
139 bool typeOK = mimeType.isEmpty() || equalIgnoringCase(mimeType, "text/css") || equalIgnoringCase(mimeType, "application/x-unknown-content-type");
140 if (hasValidMIMEType)
141 *hasValidMIMEType = typeOK;
142 if (!enforceMIMEType)
147 PassRefPtrWillBeRawPtr<StyleSheetContents> CSSStyleSheetResource::restoreParsedStyleSheet(const CSSParserContext& context)
149 if (!m_parsedStyleSheetCache)
151 if (m_parsedStyleSheetCache->hasFailedOrCanceledSubresources()) {
152 m_parsedStyleSheetCache->removedFromMemoryCache();
153 m_parsedStyleSheetCache.clear();
157 ASSERT(m_parsedStyleSheetCache->isCacheable());
158 ASSERT(m_parsedStyleSheetCache->isInMemoryCache());
160 // Contexts must be identical so we know we would get the same exact result if we parsed again.
161 if (m_parsedStyleSheetCache->parserContext() != context)
164 didAccessDecodedData();
166 return m_parsedStyleSheetCache;
169 void CSSStyleSheetResource::saveParsedStyleSheet(PassRefPtrWillBeRawPtr<StyleSheetContents> sheet)
171 ASSERT(sheet && sheet->isCacheable());
173 if (m_parsedStyleSheetCache)
174 m_parsedStyleSheetCache->removedFromMemoryCache();
175 m_parsedStyleSheetCache = sheet;
176 m_parsedStyleSheetCache->addedToMemoryCache();
178 setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());