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      1 /*
      2  * Copyright (C) 2010 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef WebData_h
     27 #define WebData_h
     28 
     29 #include "APIObject.h"
     30 #include <wtf/Forward.h>
     31 #include <wtf/Vector.h>
     32 
     33 namespace WebKit {
     34 
     35 // WebData - A data buffer type suitable for vending to an API.
     36 
     37 class WebData : public APIObject {
     38 public:
     39     static const Type APIType = TypeData;
     40 
     41     typedef void (*FreeDataFunction)(unsigned char*, const void* context);
     42 
     43     static PassRefPtr<WebData> createWithoutCopying(const unsigned char* bytes, size_t size, FreeDataFunction freeDataFunction, const void* context)
     44     {
     45         return adoptRef(new WebData(bytes, size, freeDataFunction, context));
     46     }
     47 
     48     static PassRefPtr<WebData> create(const unsigned char* bytes, size_t size)
     49     {
     50         unsigned char *copiedBytes = 0;
     51 
     52         if (size) {
     53             copiedBytes = static_cast<unsigned char*>(fastMalloc(size));
     54             memcpy(copiedBytes, bytes, size);
     55         }
     56 
     57         return createWithoutCopying(copiedBytes, size, fastFreeBytes, 0);
     58     }
     59 
     60     static PassRefPtr<WebData> create(const Vector<unsigned char>& buffer)
     61     {
     62         return create(buffer.data(), buffer.size());
     63     }
     64 
     65     ~WebData()
     66     {
     67         m_freeDataFunction(const_cast<unsigned char*>(m_bytes), m_context);
     68     }
     69 
     70     const unsigned char* bytes() const { return m_bytes; }
     71     size_t size() const { return m_size; }
     72 
     73 private:
     74     WebData(const unsigned char* bytes, size_t size, FreeDataFunction freeDataFunction, const void* context)
     75         : m_bytes(bytes)
     76         , m_size(size)
     77         , m_freeDataFunction(freeDataFunction)
     78         , m_context(context)
     79     {
     80     }
     81 
     82     static void fastFreeBytes(unsigned char* bytes, const void*)
     83     {
     84         if (bytes)
     85             fastFree(static_cast<void*>(bytes));
     86     }
     87 
     88     virtual Type type() const { return APIType; }
     89 
     90     const unsigned char* m_bytes;
     91     size_t m_size;
     92 
     93     FreeDataFunction m_freeDataFunction;
     94     const void* m_context;
     95 };
     96 
     97 } // namespace WebKit
     98 
     99 #endif // WebData_h
    100