/*
* Copyright (C) 2003, 2006, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CString_h
#define CString_h
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/WTFExport.h"
namespace WTF {
// CStringBuffer is the ref-counted storage class for the characters in a CString.
// The data is implicitly allocated 1 character longer than length(), as it is zero-terminated.
class WTF_EXPORT CStringBuffer : public RefCounted<CStringBuffer> {
public:
const char* data() { return mutableData(); }
size_t length() const { return m_length; }
private:
friend class CString;
friend class RefCounted<CStringBuffer>;
// CStringBuffers are allocated out of the WTF buffer partition.
void* operator new(size_t, void* ptr) { return ptr; };
void operator delete(void*);
static PassRefPtr<CStringBuffer> createUninitialized(size_t length);
CStringBuffer(size_t length) : m_length(length) { }
char* mutableData() { return reinterpret_cast<char*>(this + 1); }
const unsigned m_length;
};
// A container for a null-terminated char array supporting copy-on-write
// assignment. The contained char array may be null.
class WTF_EXPORT CString {
public:
CString() { }
CString(const char*);
CString(const char*, size_t length);
CString(CStringBuffer* buffer) : m_buffer(buffer) { }
static CString newUninitialized(size_t length, char*& characterBuffer);
const char* data() const
{
return m_buffer ? m_buffer->data() : 0;
}
char* mutableData();
size_t length() const
{
return m_buffer ? m_buffer->length() : 0;
}
bool isNull() const { return !m_buffer; }
bool isSafeToSendToAnotherThread() const;
CStringBuffer* buffer() const { return m_buffer.get(); }
private:
void copyBufferIfNeeded();
void init(const char*, size_t length);
RefPtr<CStringBuffer> m_buffer;
};
WTF_EXPORT bool operator==(const CString& a, const CString& b);
inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }
WTF_EXPORT bool operator==(const CString& a, const char* b);
inline bool operator!=(const CString& a, const char* b) { return !(a == b); }
} // namespace WTF
using WTF::CString;
#endif // CString_h