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 "core/html/parser/TextResourceDecoder.h"
34 #include "platform/SharedBuffer.h"
35 #include "platform/network/HTTPParsers.h"
36 #include "wtf/CurrentTime.h"
37 #include "wtf/Vector.h"
41 CSSStyleSheetResource::CSSStyleSheetResource(const ResourceRequest& resourceRequest, const String& charset)
42 : StyleSheetResource(resourceRequest, CSSStyleSheet)
43 , m_decoder(TextResourceDecoder::create("text/css", charset))
45 DEFINE_STATIC_LOCAL(const AtomicString, acceptCSS, ("text/css,*/*;q=0.1", AtomicString::ConstructFromLiteral));
47 // Prefer text/css but accept any type (dell.com serves a stylesheet
48 // as text/html; see <http://bugs.webkit.org/show_bug.cgi?id=11451>).
52 CSSStyleSheetResource::~CSSStyleSheetResource()
54 if (m_parsedStyleSheetCache)
55 m_parsedStyleSheetCache->removedFromMemoryCache();
58 void CSSStyleSheetResource::didAddClient(ResourceClient* c)
60 ASSERT(c->resourceClientType() == StyleSheetResourceClient::expectedType());
61 // Resource::didAddClient() must be before setCSSStyleSheet(),
62 // because setCSSStyleSheet() may cause scripts to be executed, which could destroy 'c' if it is an instance of HTMLLinkElement.
63 // see the comment of HTMLLinkElement::setCSSStyleSheet.
64 Resource::didAddClient(c);
67 static_cast<StyleSheetResourceClient*>(c)->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), m_decoder->encoding().name(), this);
70 void CSSStyleSheetResource::setEncoding(const String& chs)
72 m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
75 String CSSStyleSheetResource::encoding() const
77 return m_decoder->encoding().name();
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
91 String sheetText = m_decoder->decode(m_data->data(), m_data->size());
92 sheetText = sheetText + m_decoder->flush();
96 void CSSStyleSheetResource::checkNotify()
98 // Decode the data to find out the encoding and keep the sheet text around during checkNotify()
100 m_decodedSheetText = m_decoder->decode(m_data->data(), m_data->size());
101 m_decodedSheetText = m_decodedSheetText + m_decoder->flush();
104 ResourceClientWalker<StyleSheetResourceClient> w(m_clients);
105 while (StyleSheetResourceClient* c = w.next())
106 c->setCSSStyleSheet(m_resourceRequest.url(), m_response.url(), m_decoder->encoding().name(), this);
107 // Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
108 m_decodedSheetText = String();
111 bool CSSStyleSheetResource::isSafeToUnlock() const
113 return m_data->hasOneRef();
116 void CSSStyleSheetResource::destroyDecodedDataIfPossible()
118 if (!m_parsedStyleSheetCache)
121 m_parsedStyleSheetCache->removedFromMemoryCache();
122 m_parsedStyleSheetCache.clear();
127 bool CSSStyleSheetResource::canUseSheet(bool enforceMIMEType, bool* hasValidMIMEType) const
132 if (!enforceMIMEType && !hasValidMIMEType)
135 // This check exactly matches Firefox. Note that we grab the Content-Type
136 // header directly because we want to see what the value is BEFORE content
137 // sniffing. Firefox does this by setting a "type hint" on the channel.
138 // This implementation should be observationally equivalent.
140 // This code defaults to allowing the stylesheet for non-HTTP protocols so
141 // folks can use standards mode for local HTML documents.
142 const AtomicString& mimeType = extractMIMETypeFromMediaType(response().httpHeaderField("Content-Type"));
143 bool typeOK = mimeType.isEmpty() || equalIgnoringCase(mimeType, "text/css") || equalIgnoringCase(mimeType, "application/x-unknown-content-type");
144 if (hasValidMIMEType)
145 *hasValidMIMEType = typeOK;
146 if (!enforceMIMEType)
151 PassRefPtrWillBeRawPtr<StyleSheetContents> CSSStyleSheetResource::restoreParsedStyleSheet(const CSSParserContext& context)
153 if (!m_parsedStyleSheetCache)
155 if (m_parsedStyleSheetCache->hasFailedOrCanceledSubresources()) {
156 m_parsedStyleSheetCache->removedFromMemoryCache();
157 m_parsedStyleSheetCache.clear();
161 ASSERT(m_parsedStyleSheetCache->isCacheable());
162 ASSERT(m_parsedStyleSheetCache->isInMemoryCache());
164 // Contexts must be identical so we know we would get the same exact result if we parsed again.
165 if (m_parsedStyleSheetCache->parserContext() != context)
168 didAccessDecodedData();
170 return m_parsedStyleSheetCache;
173 void CSSStyleSheetResource::saveParsedStyleSheet(PassRefPtrWillBeRawPtr<StyleSheetContents> sheet)
175 ASSERT(sheet && sheet->isCacheable());
177 if (m_parsedStyleSheetCache)
178 m_parsedStyleSheetCache->removedFromMemoryCache();
179 m_parsedStyleSheetCache = sheet;
180 m_parsedStyleSheetCache->addedToMemoryCache();
182 setDecodedSize(m_parsedStyleSheetCache->estimatedSizeInBytes());