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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 WebCString_h
     32 #define WebCString_h
     33 
     34 #include "WebCommon.h"
     35 #include "WebPrivatePtr.h"
     36 
     37 #if INSIDE_WEBKIT
     38 #include <wtf/Forward.h>
     39 #endif
     40 #if !INSIDE_WEBKIT || defined(UNIT_TEST)
     41 #include <string>
     42 #endif
     43 
     44 namespace WTF {
     45 class CString;
     46 class CStringBuffer;
     47 }
     48 
     49 namespace WebKit {
     50 
     51 class WebString;
     52 
     53 // A single-byte string container with unspecified encoding.  It is
     54 // inexpensive to copy a WebCString object.
     55 //
     56 // WARNING: It is not safe to pass a WebCString across threads!!!
     57 //
     58 class WebCString {
     59 public:
     60     ~WebCString() { reset(); }
     61 
     62     WebCString() { }
     63 
     64     WebCString(const char* data, size_t len)
     65     {
     66         assign(data, len);
     67     }
     68 
     69     WebCString(const WebCString& s) { assign(s); }
     70 
     71     WebCString& operator=(const WebCString& s)
     72     {
     73         assign(s);
     74         return *this;
     75     }
     76 
     77     // Returns 0 if both strings are equals, a value greater than zero if the
     78     // first character that does not match has a greater value in this string
     79     // than in |other|, or a value less than zero to indicate the opposite.
     80     BLINK_COMMON_EXPORT int compare(const WebCString& other) const;
     81 
     82     BLINK_COMMON_EXPORT void reset();
     83     BLINK_COMMON_EXPORT void assign(const WebCString&);
     84     BLINK_COMMON_EXPORT void assign(const char* data, size_t len);
     85 
     86     BLINK_COMMON_EXPORT size_t length() const;
     87     BLINK_COMMON_EXPORT const char* data() const;
     88 
     89     bool isEmpty() const { return !length(); }
     90     bool isNull() const { return m_private.isNull(); }
     91 
     92     BLINK_COMMON_EXPORT WebString utf16() const;
     93 
     94 #if INSIDE_WEBKIT
     95     BLINK_COMMON_EXPORT WebCString(const WTF::CString&);
     96     BLINK_COMMON_EXPORT WebCString& operator=(const WTF::CString&);
     97     BLINK_COMMON_EXPORT operator WTF::CString() const;
     98 #else
     99     WebCString(const std::string& s)
    100     {
    101         assign(s.data(), s.length());
    102     }
    103 
    104     WebCString& operator=(const std::string& s)
    105     {
    106         assign(s.data(), s.length());
    107         return *this;
    108     }
    109 #endif
    110 #if !INSIDE_WEBKIT || defined(UNIT_TEST)
    111     operator std::string() const
    112     {
    113         size_t len = length();
    114         return len ? std::string(data(), len) : std::string();
    115     }
    116 
    117     template <class UTF16String>
    118     static WebCString fromUTF16(const UTF16String& s)
    119     {
    120         return fromUTF16(s.data(), s.length());
    121     }
    122 #endif
    123 
    124 private:
    125     BLINK_COMMON_EXPORT void assign(WTF::CStringBuffer*);
    126     WebPrivatePtr<WTF::CStringBuffer> m_private;
    127 };
    128 
    129 inline bool operator<(const WebCString& a, const WebCString& b)
    130 {
    131     return a.compare(b) < 0;
    132 }
    133 
    134 } // namespace WebKit
    135 
    136 #endif
    137