CString.h 3.4 KB

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  1. /*
  2. * Copyright (C) 2003, 2006, 2008, 2009, 2010, 2012 Apple 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
  6. * are met:
  7. * 1. Redistributions of source code must retain the above copyright
  8. * notice, this list of conditions and the following disclaimer.
  9. * 2. Redistributions in binary form must reproduce the above copyright
  10. * notice, this list of conditions and the following disclaimer in the
  11. * documentation and/or other materials provided with the distribution.
  12. *
  13. * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14. * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16. * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17. * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18. * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19. * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20. * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21. * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24. */
  25. #ifndef CString_h
  26. #define CString_h
  27. #include <wtf/PassRefPtr.h>
  28. #include <wtf/RefCounted.h>
  29. #include <wtf/Vector.h>
  30. namespace WTF {
  31. // CStringBuffer is the ref-counted storage class for the characters in a CString.
  32. // The data is implicitly allocated 1 character longer than length(), as it is zero-terminated.
  33. class CStringBuffer : public RefCounted<CStringBuffer> {
  34. public:
  35. const char* data() { return m_data; }
  36. size_t length() const { return m_length; }
  37. private:
  38. friend class CString;
  39. static PassRefPtr<CStringBuffer> createUninitialized(size_t length);
  40. CStringBuffer(size_t length) : m_length(length) { }
  41. char* mutableData() { return m_data; }
  42. const size_t m_length;
  43. char m_data[1];
  44. };
  45. // A container for a null-terminated char array supporting copy-on-write
  46. // assignment. The contained char array may be null.
  47. class CString {
  48. public:
  49. CString() { }
  50. WTF_EXPORT_PRIVATE CString(const char*);
  51. WTF_EXPORT_PRIVATE CString(const char*, size_t length);
  52. CString(CStringBuffer* buffer) : m_buffer(buffer) { }
  53. WTF_EXPORT_PRIVATE static CString newUninitialized(size_t length, char*& characterBuffer);
  54. const char* data() const
  55. {
  56. return m_buffer ? m_buffer->data() : 0;
  57. }
  58. WTF_EXPORT_PRIVATE char* mutableData();
  59. size_t length() const
  60. {
  61. return m_buffer ? m_buffer->length() : 0;
  62. }
  63. bool isNull() const { return !m_buffer; }
  64. bool isSafeToSendToAnotherThread() const;
  65. CStringBuffer* buffer() const { return m_buffer.get(); }
  66. private:
  67. void copyBufferIfNeeded();
  68. void init(const char*, size_t length);
  69. RefPtr<CStringBuffer> m_buffer;
  70. };
  71. WTF_EXPORT_PRIVATE bool operator==(const CString& a, const CString& b);
  72. inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }
  73. WTF_EXPORT_PRIVATE bool operator==(const CString& a, const char* b);
  74. inline bool operator!=(const CString& a, const char* b) { return !(a == b); }
  75. } // namespace WTF
  76. using WTF::CString;
  77. #endif // CString_h