--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/loader/CachedCSSStyleSheet.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,150 @@
+/*
+    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 "config.h"
+#include "CachedCSSStyleSheet.h"
+
+#include "CachedResourceClient.h"
+#include "CachedResourceClientWalker.h"
+#include "HTTPParsers.h"
+#include "TextResourceDecoder.h"
+#include "SharedBuffer.h"
+#include "loader.h"
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+CachedCSSStyleSheet::CachedCSSStyleSheet(const String& url, const String& charset)
+    : CachedResource(url, CSSStyleSheet)
+    , m_decoder(TextResourceDecoder::create("text/css", charset))
+{
+    // Prefer text/css but accept any type (dell.com serves a stylesheet
+    // as text/html; see <http://bugs.webkit.org/show_bug.cgi?id=11451>).
+    setAccept("text/css,*/*;q=0.1");
+}
+
+CachedCSSStyleSheet::~CachedCSSStyleSheet()
+{
+}
+
+void CachedCSSStyleSheet::didAddClient(CachedResourceClient *c)
+{
+    if (!isLoading())
+        c->setCSSStyleSheet(m_url, m_response.url(), m_decoder->encoding().name(), this);
+}
+
+void CachedCSSStyleSheet::allClientsRemoved()
+{
+    if (isSafeToMakePurgeable())
+        makePurgeable(true);
+}
+
+void CachedCSSStyleSheet::setEncoding(const String& chs)
+{
+    m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
+}
+
+String CachedCSSStyleSheet::encoding() const
+{
+    return m_decoder->encoding().name();
+}
+    
+const String CachedCSSStyleSheet::sheetText(bool enforceMIMEType, bool* hasValidMIMEType) const 
+{ 
+    ASSERT(!isPurgeable());
+
+    if (!m_data || m_data->isEmpty() || !canUseSheet(enforceMIMEType, hasValidMIMEType))
+        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
+    String sheetText = m_decoder->decode(m_data->data(), m_data->size());
+    sheetText += m_decoder->flush();
+    return sheetText;
+}
+
+void CachedCSSStyleSheet::data(PassRefPtr<SharedBuffer> data, bool allDataReceived)
+{
+    if (!allDataReceived)
+        return;
+
+    m_data = data;
+    setEncodedSize(m_data.get() ? m_data->size() : 0);
+    // Decode the data to find out the encoding and keep the sheet text around during checkNotify()
+    if (m_data) {
+        m_decodedSheetText = m_decoder->decode(m_data->data(), m_data->size());
+        m_decodedSheetText += m_decoder->flush();
+    }
+    setLoading(false);
+    checkNotify();
+    // Clear the decoded text as it is unlikely to be needed immediately again and is cheap to regenerate.
+    m_decodedSheetText = String();
+}
+
+void CachedCSSStyleSheet::checkNotify()
+{
+    if (isLoading())
+        return;
+
+    CachedResourceClientWalker w(m_clients);
+    while (CachedResourceClient *c = w.next())
+        c->setCSSStyleSheet(m_url, m_response.url(), m_decoder->encoding().name(), this);
+}
+
+void CachedCSSStyleSheet::error()
+{
+    setLoading(false);
+    setErrorOccurred(true);
+    checkNotify();
+}
+
+bool CachedCSSStyleSheet::canUseSheet(bool enforceMIMEType, bool* hasValidMIMEType) const
+{
+    if (errorOccurred())
+        return false;
+        
+    if (!enforceMIMEType && !hasValidMIMEType)
+        return true;
+
+    // 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.
+    String mimeType = extractMIMETypeFromMediaType(response().httpHeaderField("Content-Type"));
+    bool typeOK = mimeType.isEmpty() || equalIgnoringCase(mimeType, "text/css") || equalIgnoringCase(mimeType, "application/x-unknown-content-type");
+    if (hasValidMIMEType)
+        *hasValidMIMEType = typeOK;
+    if (!enforceMIMEType)
+        return true;
+    return typeOK;
+}
+ 
+}