1 /////////////////////////////////////////////////////////////////////////////// 2 // Name: wx/convauto.h 3 // Purpose: wxConvAuto class declaration 4 // Author: Vadim Zeitlin 5 // Created: 2006-04-03 6 // RCS-ID: $Id: convauto.h 45893 2007-05-08 20:05:16Z VZ $ 7 // Copyright: (c) 2006 Vadim Zeitlin 8 // Licence: wxWindows licence 9 /////////////////////////////////////////////////////////////////////////////// 10 11 #ifndef _WX_CONVAUTO_H_ 12 #define _WX_CONVAUTO_H_ 13 14 #include "wx/strconv.h" 15 16 #if wxUSE_WCHAR_T 17 18 // ---------------------------------------------------------------------------- 19 // wxConvAuto: uses BOM to automatically detect input encoding 20 // ---------------------------------------------------------------------------- 21 22 class WXDLLIMPEXP_BASE wxConvAuto : public wxMBConv 23 { 24 public: 25 // default ctor, the real conversion will be created on demand wxConvAuto()26 wxConvAuto() { m_conv = NULL; /* the rest will be initialized later */ } 27 28 // copy ctor doesn't initialize anything neither as conversion can only be 29 // deduced on first use wxConvAuto(const wxConvAuto & WXUNUSED (other))30 wxConvAuto(const wxConvAuto& WXUNUSED(other)) : wxMBConv() { m_conv = NULL; } 31 ~wxConvAuto()32 virtual ~wxConvAuto() { if ( m_conv && m_ownsConv ) delete m_conv; } 33 34 // override the base class virtual function(s) to use our m_conv 35 virtual size_t ToWChar(wchar_t *dst, size_t dstLen, 36 const char *src, size_t srcLen = wxNO_LEN) const; 37 38 virtual size_t FromWChar(char *dst, size_t dstLen, 39 const wchar_t *src, size_t srcLen = wxNO_LEN) const; 40 GetMBNulLen()41 virtual size_t GetMBNulLen() const { return m_conv->GetMBNulLen(); } 42 Clone()43 virtual wxMBConv *Clone() const { return new wxConvAuto(*this); } 44 45 private: 46 // all currently recognized BOM values 47 enum BOMType 48 { 49 BOM_None, 50 BOM_UTF32BE, 51 BOM_UTF32LE, 52 BOM_UTF16BE, 53 BOM_UTF16LE, 54 BOM_UTF8 55 }; 56 57 // return the BOM type of this buffer 58 static BOMType DetectBOM(const char *src, size_t srcLen); 59 60 // initialize m_conv with the conversion to use by default (UTF-8) InitWithDefault()61 void InitWithDefault() 62 { 63 m_conv = &wxConvUTF8; 64 m_ownsConv = false; 65 } 66 67 // create the correct conversion object for the given BOM type 68 void InitFromBOM(BOMType bomType); 69 70 // create the correct conversion object for the BOM present in the 71 // beginning of the buffer; adjust the buffer to skip the BOM if found 72 void InitFromInput(const char **src, size_t *len); 73 74 // adjust src and len to skip over the BOM (identified by m_bomType) at the 75 // start of the buffer 76 void SkipBOM(const char **src, size_t *len) const; 77 78 79 // conversion object which we really use, NULL until the first call to 80 // either ToWChar() or FromWChar() 81 wxMBConv *m_conv; 82 83 // our BOM type 84 BOMType m_bomType; 85 86 // true if we allocated m_conv ourselves, false if we just use an existing 87 // global conversion 88 bool m_ownsConv; 89 90 // true if we already skipped BOM when converting (and not just calculating 91 // the size) 92 bool m_consumedBOM; 93 94 95 DECLARE_NO_ASSIGN_CLASS(wxConvAuto) 96 }; 97 98 #else // !wxUSE_WCHAR_T 99 100 // it doesn't matter how we define it in this case as it's unused anyhow, but 101 // do define it to allow the code using wxConvAuto() as default argument (this 102 // is done in many places) to compile 103 typedef wxMBConv wxConvAuto; 104 105 #endif // wxUSE_WCHAR_T/!wxUSE_WCHAR_T 106 107 #endif // _WX_CONVAUTO_H_ 108 109