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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 namespace WTF { template <typename T> class RefPtr; }
     40 #endif
     41 
     42 namespace WebKit {
     43 
     44 class WebDataPrivate;
     45 
     46 // A container for raw bytes.  It is inexpensive to copy a WebData object.
     47 //
     48 // WARNING: It is not safe to pass a WebData across threads!!!
     49 //
     50 class WebData {
     51 public:
     52     ~WebData() { reset(); }
     53 
     54     WebData() : m_private(0) { }
     55 
     56     WebData(const char* data, size_t size) : m_private(0)
     57     {
     58         assign(data, size);
     59     }
     60 
     61     template <int N>
     62     WebData(const char (&data)[N]) : m_private(0)
     63     {
     64         assign(data, N - 1);
     65     }
     66 
     67     WebData(const WebData& d) : m_private(0) { assign(d); }
     68 
     69     WebData& operator=(const WebData& d)
     70     {
     71         assign(d);
     72         return *this;
     73     }
     74 
     75     WEBKIT_EXPORT void reset();
     76     WEBKIT_EXPORT void assign(const WebData&);
     77     WEBKIT_EXPORT void assign(const char* data, size_t size);
     78 
     79     WEBKIT_EXPORT size_t size() const;
     80     WEBKIT_EXPORT const char* data() const;
     81 
     82     bool isEmpty() const { return !size(); }
     83     bool isNull() const { return !m_private; }
     84 
     85 #if WEBKIT_IMPLEMENTATION
     86     WebData(const WTF::PassRefPtr<WebCore::SharedBuffer>&);
     87     WebData& operator=(const WTF::PassRefPtr<WebCore::SharedBuffer>&);
     88     operator WTF::PassRefPtr<WebCore::SharedBuffer>() const;
     89     operator WTF::RefPtr<WebCore::SharedBuffer>() const;
     90 #else
     91     template <class C>
     92     WebData(const C& c) : m_private(0)
     93     {
     94         assign(c.data(), c.size());
     95     }
     96 
     97     template <class C>
     98     WebData& operator=(const C& c)
     99     {
    100         assign(c.data(), c.size());
    101         return *this;
    102     }
    103 #endif
    104 
    105 private:
    106     void assign(WebDataPrivate*);
    107     WebDataPrivate* m_private;
    108 };
    109 
    110 } // namespace WebKit
    111 
    112 #endif
    113