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      1 /*
      2     Copyright (C) 1998 Lars Knoll (knoll (at) mpi-hd.mpg.de)
      3     Copyright (C) 2001 Dirk Mueller (mueller (at) kde.org)
      4     Copyright (C) 2002 Waldo Bastian (bastian (at) kde.org)
      5     Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com)
      6     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
      7 
      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.
     12 
     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.
     17 
     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.
     22 
     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.
     25 */
     26 
     27 #include "config.h"
     28 #include "CachedScript.h"
     29 
     30 #include "CachedResourceClient.h"
     31 #include "CachedResourceClientWalker.h"
     32 #include "TextResourceDecoder.h"
     33 #include <wtf/Vector.h>
     34 
     35 namespace WebCore {
     36 
     37 CachedScript::CachedScript(const String& url, const String& charset)
     38     : CachedResource(url, Script)
     39     , m_decoder(TextResourceDecoder::create("application/javascript", charset))
     40     , m_decodedDataDeletionTimer(this, &CachedScript::decodedDataDeletionTimerFired)
     41 {
     42     // It's javascript we want.
     43     // But some websites think their scripts are <some wrong mimetype here>
     44     // and refuse to serve them if we only accept application/x-javascript.
     45     setAccept("*/*");
     46 }
     47 
     48 CachedScript::~CachedScript()
     49 {
     50 }
     51 
     52 void CachedScript::didAddClient(CachedResourceClient* c)
     53 {
     54     if (!m_loading)
     55         c->notifyFinished(this);
     56 }
     57 
     58 void CachedScript::allClientsRemoved()
     59 {
     60     m_decodedDataDeletionTimer.startOneShot(0);
     61 }
     62 
     63 void CachedScript::setEncoding(const String& chs)
     64 {
     65     m_decoder->setEncoding(chs, TextResourceDecoder::EncodingFromHTTPHeader);
     66 }
     67 
     68 String CachedScript::encoding() const
     69 {
     70     return m_decoder->encoding().name();
     71 }
     72 
     73 const String& CachedScript::script()
     74 {
     75     ASSERT(!isPurgeable());
     76 
     77     if (!m_script && m_data) {
     78         m_script = m_decoder->decode(m_data->data(), encodedSize());
     79         m_script += m_decoder->flush();
     80         setDecodedSize(m_script.length() * sizeof(UChar));
     81     }
     82 
     83     m_decodedDataDeletionTimer.startOneShot(0);
     84     return m_script;
     85 }
     86 
     87 void CachedScript::data(PassRefPtr<SharedBuffer> data, bool allDataReceived)
     88 {
     89     if (!allDataReceived)
     90         return;
     91 
     92     m_data = data;
     93     setEncodedSize(m_data.get() ? m_data->size() : 0);
     94     m_loading = false;
     95     checkNotify();
     96 }
     97 
     98 void CachedScript::checkNotify()
     99 {
    100     if (m_loading)
    101         return;
    102 
    103     CachedResourceClientWalker w(m_clients);
    104     while (CachedResourceClient* c = w.next())
    105         c->notifyFinished(this);
    106 }
    107 
    108 void CachedScript::error()
    109 {
    110     m_loading = false;
    111     m_errorOccurred = true;
    112     checkNotify();
    113 }
    114 
    115 void CachedScript::destroyDecodedData()
    116 {
    117     m_script = String();
    118     setDecodedSize(0);
    119     if (isSafeToMakePurgeable())
    120         makePurgeable(true);
    121 }
    122 
    123 void CachedScript::decodedDataDeletionTimerFired(Timer<CachedScript>*)
    124 {
    125     destroyDecodedData();
    126 }
    127 
    128 } // namespace WebCore
    129