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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef BlobResourceHandle_h
     32 #define BlobResourceHandle_h
     33 
     34 #if ENABLE(BLOB)
     35 
     36 #include "FileStreamClient.h"
     37 #include "PlatformString.h"
     38 #include "ResourceHandle.h"
     39 #include <wtf/PassRefPtr.h>
     40 #include <wtf/Vector.h>
     41 
     42 namespace WebCore {
     43 
     44 class AsyncFileStream;
     45 class BlobStorageData;
     46 class FileStream;
     47 class ResourceHandleClient;
     48 class ResourceRequest;
     49 struct BlobDataItem;
     50 
     51 class BlobResourceHandle : public FileStreamClient, public ResourceHandle  {
     52 public:
     53     static PassRefPtr<BlobResourceHandle> create(PassRefPtr<BlobStorageData> blobData, const ResourceRequest& request, ResourceHandleClient* client, bool async = true)
     54     {
     55         return adoptRef(new BlobResourceHandle(blobData, request, client, async));
     56     }
     57 
     58     static void loadResourceSynchronously(PassRefPtr<BlobStorageData> blobData, const ResourceRequest& request, ResourceError& error, ResourceResponse& response, Vector<char>& data);
     59 
     60     // FileStreamClient methods.
     61     virtual void didGetSize(long long);
     62     virtual void didOpen(bool);
     63     virtual void didRead(int);
     64 
     65     // ResourceHandle methods.
     66     virtual void cancel();
     67 
     68     void start();
     69     int readSync(char*, int);
     70 
     71 private:
     72     friend void delayedStartBlobResourceHandle(void*);
     73 
     74     BlobResourceHandle(PassRefPtr<BlobStorageData>, const ResourceRequest&, ResourceHandleClient*, bool async);
     75     virtual ~BlobResourceHandle();
     76 
     77     void doStart();
     78     void getSizeForNext();
     79     void seek();
     80     void consumeData(const char* data, int bytesRead);
     81     void failed(int errorCode);
     82 
     83     void readAsync();
     84     void readDataAsync(const BlobDataItem&);
     85     void readFileAsync(const BlobDataItem&);
     86 
     87     int readDataSync(const BlobDataItem&, char*, int);
     88     int readFileSync(const BlobDataItem&, char*, int);
     89 
     90     void notifyResponse();
     91     void notifyResponseOnSuccess();
     92     void notifyResponseOnError();
     93     void notifyReceiveData(const char*, int);
     94     void notifyFail(int errorCode);
     95     void notifyFinish();
     96 
     97     RefPtr<BlobStorageData> m_blobData;
     98     bool m_async;
     99     RefPtr<AsyncFileStream> m_asyncStream; // For asynchronous loading.
    100     RefPtr<FileStream> m_stream; // For synchronous loading.
    101     Vector<char> m_buffer;
    102     Vector<long long> m_itemLengthList;
    103     int m_errorCode;
    104     bool m_aborted;
    105     long long m_rangeOffset;
    106     long long m_rangeEnd;
    107     long long m_rangeSuffixLength;
    108     long long m_totalRemainingSize;
    109     long long m_currentItemReadSize;
    110     unsigned m_sizeItemCount;
    111     unsigned m_readItemCount;
    112     bool m_fileOpened;
    113 };
    114 
    115 } // namespace WebCore
    116 
    117 #endif // ENABLE(BLOB)
    118 
    119 #endif // BlobResourceHandle_h
    120