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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 
     36 #if WEBKIT_IMPLEMENTATION
     37 namespace WebCore { class SharedBuffer; }
     38 namespace WTF { template <typename T> class PassRefPtr; }
     39 #endif
     40 
     41 namespace WebKit {
     42 
     43 class WebDataPrivate;
     44 
     45 // A container for raw bytes.  It is inexpensive to copy a WebData object.
     46 //
     47 // WARNING: It is not safe to pass a WebData across threads!!!
     48 //
     49 class WebData {
     50 public:
     51     ~WebData() { reset(); }
     52 
     53     WebData() : m_private(0) { }
     54 
     55     WebData(const char* data, size_t size) : m_private(0)
     56     {
     57         assign(data, size);
     58     }
     59 
     60     template <int N>
     61     WebData(const char (&data)[N]) : m_private(0)
     62     {
     63         assign(data, N - 1);
     64     }
     65 
     66     WebData(const WebData& d) : m_private(0) { assign(d); }
     67 
     68     WebData& operator=(const WebData& d)
     69     {
     70         assign(d);
     71         return *this;
     72     }
     73 
     74     WEBKIT_API void reset();
     75     WEBKIT_API void assign(const WebData&);
     76     WEBKIT_API void assign(const char* data, size_t size);
     77 
     78     WEBKIT_API size_t size() const;
     79     WEBKIT_API const char* data() const;
     80 
     81     bool isEmpty() const { return !size(); }
     82     bool isNull() const { return !m_private; }
     83 
     84 #if WEBKIT_IMPLEMENTATION
     85     WebData(const WTF::PassRefPtr<WebCore::SharedBuffer>&);
     86     WebData& operator=(const WTF::PassRefPtr<WebCore::SharedBuffer>&);
     87     operator WTF::PassRefPtr<WebCore::SharedBuffer>() const;
     88 #else
     89     template <class C>
     90     WebData(const C& c) : m_private(0)
     91     {
     92         assign(c.data(), c.size());
     93     }
     94 
     95     template <class C>
     96     WebData& operator=(const C& c)
     97     {
     98         assign(c.data(), c.size());
     99         return *this;
    100     }
    101 #endif
    102 
    103 private:
    104     void assign(WebDataPrivate*);
    105     WebDataPrivate* m_private;
    106 };
    107 
    108 } // namespace WebKit
    109 
    110 #endif
    111