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      1 /*
      2  * Copyright (C) 2009 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 WebData_h
     32 #define WebData_h
     33 
     34 #include "WebCommon.h"
     35 #include "WebPrivatePtr.h"
     36 
     37 namespace WebCore { class SharedBuffer; }
     38 
     39 namespace blink {
     40 
     41 class WebDataPrivate;
     42 
     43 // A container for raw bytes.  It is inexpensive to copy a WebData object.
     44 //
     45 // WARNING: It is not safe to pass a WebData across threads!!!
     46 //
     47 class BLINK_PLATFORM_EXPORT WebData {
     48 public:
     49     ~WebData() { reset(); }
     50 
     51     WebData() { }
     52 
     53     WebData(const char* data, size_t size)
     54     {
     55         assign(data, size);
     56     }
     57 
     58     template <int N>
     59     WebData(const char (&data)[N])
     60     {
     61         assign(data, N - 1);
     62     }
     63 
     64     WebData(const WebData& d) { assign(d); }
     65 
     66     WebData& operator=(const WebData& d)
     67     {
     68         assign(d);
     69         return *this;
     70     }
     71 
     72     void reset();
     73     void assign(const WebData&);
     74     void assign(const char* data, size_t size);
     75 
     76     size_t size() const;
     77     const char* data() const;
     78 
     79     bool isEmpty() const { return !size(); }
     80     bool isNull() const { return m_private.isNull(); }
     81 
     82 #if INSIDE_BLINK
     83     WebData(const PassRefPtr<WebCore::SharedBuffer>&);
     84     WebData& operator=(const PassRefPtr<WebCore::SharedBuffer>&);
     85     operator PassRefPtr<WebCore::SharedBuffer>() const;
     86 #else
     87     template <class C>
     88     WebData(const C& c)
     89     {
     90         assign(c.data(), c.size());
     91     }
     92 
     93     template <class C>
     94     WebData& operator=(const C& c)
     95     {
     96         assign(c.data(), c.size());
     97         return *this;
     98     }
     99 #endif
    100 
    101 private:
    102     WebPrivatePtr<WebCore::SharedBuffer> m_private;
    103 };
    104 
    105 } // namespace blink
    106 
    107 #endif
    108