Split utility functions into base (in utilsexc_base.cpp) and gui (src/osx/carbon...

[wxWidgets.git] / include / wx / buffer.h

diff --git a/include/wx/buffer.h b/include/wx/buffer.h
index cd4d760661e52952a753ed36c77ec530887b7ce9..32443237373ac92b4429d53f69cfe227f3dac051 100644 (file)
--- a/include/wx/buffer.h
+++ b/include/wx/buffer.h
@@ -12,14 +12,14 @@
 #ifndef _WX_BUFFER_H
 #define _WX_BUFFER_H
 
 #ifndef _WX_BUFFER_H
 #define _WX_BUFFER_H
 

-#include "wx/wxchar.h"
+#include "wx/chartype.h"
+#include "wx/wxcrtbase.h"

 
 

+#ifndef __WXPALMOS5__

 #include <stdlib.h>             // malloc() and free()
 #include <stdlib.h>             // malloc() and free()

+#endif // ! __WXPALMOS5__

 
 

-inline char *wxStrDup(const char *s) { return wxStrdupA(s); }
-#if wxUSE_WCHAR_T
-    inline wchar_t *wxStrDup(const wchar_t *ws) { return wxStrdupW(ws); }
-#endif
+class WXDLLIMPEXP_FWD_BASE wxCStrData;

 
 // ----------------------------------------------------------------------------
 // Special classes for (wide) character strings: they use malloc/free instead
 
 // ----------------------------------------------------------------------------
 // Special classes for (wide) character strings: they use malloc/free instead


@@ -33,126 +33,239 @@ public:
     typedef T CharType;
 
     wxCharTypeBuffer(const CharType *str = NULL)
     typedef T CharType;
 
     wxCharTypeBuffer(const CharType *str = NULL)

-        : m_str(str ? wxStrDup(str) : NULL)

     {
     {

+        if ( str )
+            m_data = new Data(wxStrdup(str));
+        else
+            m_data = &NullData;

     }
 
     }
 

-    wxCharTypeBuffer(const wxCStrData& cstr)
+    wxCharTypeBuffer(size_t len)

     {
     {

-        FromCStrData(cstr);
+        m_data = new Data((CharType *)malloc((len + 1)*sizeof(CharType)));
+        m_data->m_str[len] = (CharType)0;

     }
 
     }
 

-    wxCharTypeBuffer(size_t len)
-        : m_str((CharType *)malloc((len + 1)*sizeof(CharType)))
+    static const wxCharTypeBuffer CreateNonOwned(const CharType *str)

     {
     {

-        m_str[len] = (CharType)0;
+        wxCharTypeBuffer buf;
+        if ( str )
+            buf.m_data = new Data(wx_const_cast(CharType*, str), Data::NonOwned);
+        return buf;

     }
 
     }
 

-    /* no need to check for NULL, free() does it */
-    ~wxCharTypeBuffer() { free(m_str); }
+    ~wxCharTypeBuffer()
+    {
+        DecRef();
+    }

 
 

-    /*
-        WARNING:
+    // NB: this method is only const for backward compatibility. It used to
+    //     be needed for auto_ptr-like semantics of the copy ctor, but now
+    //     that ref-counting is used, it's not really needed.
+    CharType *release() const
+    {
+        if ( m_data == &NullData )
+            return NULL;

 
 

-        the copy ctor and assignment operators change the passed in object
-        even although it is declared as "const", so:
+        wxASSERT_MSG( m_data->m_owned, _T("can't release non-owned buffer") );
+        wxASSERT_MSG( m_data->m_ref == 1, _T("can't release shared buffer") );

 
 

-        a) it shouldn't be really const
-        b) you shouldn't use it afterwards (or know that it was reset)
+        CharType *p = m_data->m_str;

 
 

-        This is very ugly but is unfortunately needed to make the normal use\
-        of wxCharTypeBuffer buffer objects possible and is very similar to what
-        std::auto_ptr<> does (as if it were an excuse...)
-    */
+        wxCharTypeBuffer *self = wx_const_cast(wxCharTypeBuffer*, this);
+        self->m_data->m_str = NULL;
+        self->DecRef();

 
 

-    /*
-       because of the remark above, release() is declared const even if it
-       isn't really const
-     */
-    CharType *release() const
-    {
-        CharType *p = m_str;
-        ((wxCharTypeBuffer *)this)->m_str = NULL;

         return p;
     }
 
     void reset()
     {
         return p;
     }
 
     void reset()
     {

-        free(m_str);
-        m_str = NULL;
+        DecRef();

     }
 
     wxCharTypeBuffer(const wxCharTypeBuffer& src)
     }
 
     wxCharTypeBuffer(const wxCharTypeBuffer& src)

-        : m_str(src.release())

     {
     {

+        m_data = src.m_data;
+        IncRef();

     }
 
     wxCharTypeBuffer& operator=(const CharType *str)
     {
     }
 
     wxCharTypeBuffer& operator=(const CharType *str)
     {

-        free(m_str);
-        m_str = str ? wxStrDup(str) : NULL;
+        DecRef();
+
+        if ( str )
+            m_data = new Data(wxStrdup(str));

         return *this;
     }
 
     wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src)
     {
         return *this;
     }
 
     wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src)
     {

-        free(m_str);
-        m_str = src.release();
+        if ( &src == this )
+            return *this;
+
+        DecRef();
+        m_data = src.m_data;
+        IncRef();

 
         return *this;
     }
 
     bool extend(size_t len)
     {
 
         return *this;
     }
 
     bool extend(size_t len)
     {

-        CharType *
-            str = (CharType *)realloc(m_str, (len + 1)*sizeof(CharType));
+        wxASSERT_MSG( m_data->m_owned, _T("cannot extend non-owned buffer") );
+        wxASSERT_MSG( m_data->m_ref == 1, _T("can't extend shared buffer") );
+
+        CharType *str =
+            (CharType *)realloc(data(), (len + 1) * sizeof(CharType));

         if ( !str )
             return false;
 
         if ( !str )
             return false;
 

-        m_str = str;
+        if ( m_data == &NullData )
+        {
+            m_data = new Data(str);
+        }
+        else
+        {
+            m_data->m_str = str;
+            m_data->m_owned = true;
+        }

 
         return true;
     }
 
 
         return true;
     }
 

-    CharType *data() { return m_str; }
-    const CharType *data() const { return m_str; }
-    operator const CharType *() const { return m_str; }
-    CharType operator[](size_t n) const { return m_str[n]; }
+    CharType *data() { return m_data->m_str; }
+    const CharType *data() const { return  m_data->m_str; }
+    operator const CharType *() const { return data(); }
+    CharType operator[](size_t n) const { return data()[n]; }

 
 private:
 
 private:

-    void FromCStrData(const wxCStrData& cstr);
+    // reference-counted data
+    struct Data
+    {
+        enum Kind
+        {
+            Owned,
+            NonOwned
+        };
+
+        Data(CharType *str, Kind kind = Owned)
+            : m_str(str), m_ref(1), m_owned(kind == Owned) {}
+
+        ~Data()
+        {
+            if ( m_owned )
+                free(m_str);
+        }
+
+        CharType *m_str;
+
+        // "short" to have sizeof(Data)=8 on 32bit archs
+        unsigned short m_ref;
+
+        bool m_owned;
+    };
+
+    // placeholder for NULL string, to simplify this code
+    // NB: this is defined in string.cpp, not (non-existent) buffer.cpp
+#ifdef __MINGW32__
+    // MinGW requires explicit WXDLLIMPEXP_DATA_BASE to avoid compilation
+    // errors
+    static WXDLLIMPEXP_DATA_BASE(Data) NullData;
+#else
+    // but Visual C++ doesn't like it
+    static Data NullData;
+#endif
+
+    void IncRef()
+    {
+        if ( m_data == &NullData ) // exception, not ref-counted
+            return;
+        m_data->m_ref++;
+    }
+
+    void DecRef()
+    {
+        if ( m_data == &NullData ) // exception, not ref-counted
+            return;
+        if ( --m_data->m_ref == 0 )
+            delete m_data;
+        m_data = &NullData;
+    }

 
 private:
 
 private:

-    CharType *m_str;
+    Data *m_data;

 };
 
 };
 

+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<char> )
+

 class WXDLLIMPEXP_BASE wxCharBuffer : public wxCharTypeBuffer<char>
 {
 public:
 class WXDLLIMPEXP_BASE wxCharBuffer : public wxCharTypeBuffer<char>
 {
 public:

-    wxCharBuffer(const CharType *str = NULL) : wxCharTypeBuffer<char>(str) {}
-    wxCharBuffer(const wxCStrData& cstr) : wxCharTypeBuffer<char>(cstr) {}
-    wxCharBuffer(size_t len) : wxCharTypeBuffer<char>(len) {}
+    typedef wxCharTypeBuffer<char> wxCharTypeBufferBase;
+
+    wxCharBuffer(const wxCharTypeBufferBase& buf)
+        : wxCharTypeBufferBase(buf) {}
+
+    wxCharBuffer(const CharType *str = NULL) : wxCharTypeBufferBase(str) {}
+    wxCharBuffer(size_t len) : wxCharTypeBufferBase(len) {}
+
+    wxCharBuffer(const wxCStrData& cstr);

 };
 
 #if wxUSE_WCHAR_T
 };
 
 #if wxUSE_WCHAR_T

+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<wchar_t> )
+

 class WXDLLIMPEXP_BASE wxWCharBuffer : public wxCharTypeBuffer<wchar_t>
 {
 public:
 class WXDLLIMPEXP_BASE wxWCharBuffer : public wxCharTypeBuffer<wchar_t>
 {
 public:

-    wxWCharBuffer(const CharType *str = NULL) : wxCharTypeBuffer<wchar_t>(str) {}
-    wxWCharBuffer(const wxCStrData& cstr) : wxCharTypeBuffer<wchar_t>(cstr) {}
-    wxWCharBuffer(size_t len) : wxCharTypeBuffer<wchar_t>(len) {}
+    typedef wxCharTypeBuffer<wchar_t> wxCharTypeBufferBase;
+
+    wxWCharBuffer(const wxCharTypeBufferBase& buf)
+        : wxCharTypeBufferBase(buf) {}
+
+    wxWCharBuffer(const CharType *str = NULL) : wxCharTypeBufferBase(str) {}
+    wxWCharBuffer(size_t len) : wxCharTypeBufferBase(len) {}
+
+    wxWCharBuffer(const wxCStrData& cstr);

 };
 #endif // wxUSE_WCHAR_T
 
 };
 #endif // wxUSE_WCHAR_T
 

+// wxCharTypeBuffer<T> implicitly convertible to T*
+template <typename T>
+class wxWritableCharTypeBuffer : public wxCharTypeBuffer<T>
+{
+public:
+    typedef typename wxCharTypeBuffer<T>::CharType CharType;
+
+    wxWritableCharTypeBuffer(const wxCharTypeBuffer<T>& src)
+        : wxCharTypeBuffer<T>(src) {}
+    // FIXME-UTF8: this won't be needed after converting mb_str()/wc_str() to
+    //             always return a buffer
+    wxWritableCharTypeBuffer(const CharType *str = NULL)
+        : wxCharTypeBuffer<T>(str) {}
+
+    operator CharType*() { return this->data(); }
+};
+
+typedef wxWritableCharTypeBuffer<char> wxWritableCharBuffer;
+typedef wxWritableCharTypeBuffer<wchar_t> wxWritableWCharBuffer;
+
+

 #if wxUSE_UNICODE
 #if wxUSE_UNICODE

-    typedef wxWCharBuffer wxWxCharBuffer;
+    #define wxWxCharBuffer wxWCharBuffer

 
     #define wxMB2WXbuf wxWCharBuffer
     #define wxWX2MBbuf wxCharBuffer
 
     #define wxMB2WXbuf wxWCharBuffer
     #define wxWX2MBbuf wxCharBuffer

-    #define wxWC2WXbuf wxChar*
-    #define wxWX2WCbuf wxChar*
+    #if wxUSE_UNICODE_WCHAR
+        #define wxWC2WXbuf wxChar*
+        #define wxWX2WCbuf wxChar*
+    #elif wxUSE_UNICODE_UTF8
+        #define wxWC2WXbuf wxWCharBuffer
+        #define wxWX2WCbuf wxWCharBuffer
+    #endif

 #else // ANSI
 #else // ANSI

-    typedef wxCharBuffer wxWxCharBuffer;
+    #define wxWxCharBuffer wxCharBuffer

 
     #define wxMB2WXbuf wxChar*
     #define wxWX2MBbuf wxChar*
 
     #define wxMB2WXbuf wxChar*
     #define wxWX2MBbuf wxChar*


@@ -160,6 +273,13 @@ public:
     #define wxWX2WCbuf wxWCharBuffer
 #endif // Unicode/ANSI
 
     #define wxWX2WCbuf wxWCharBuffer
 #endif // Unicode/ANSI
 

+// type of the value returned by wxString::utf8_str()
+#if wxUSE_UNICODE_UTF8
+    #define wxUTF8Buf char *
+#else
+    #define wxUTF8Buf wxCharBuffer
+#endif
+

 // ----------------------------------------------------------------------------
 // A class for holding growable data buffers (not necessarily strings)
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // A class for holding growable data buffers (not necessarily strings)
 // ----------------------------------------------------------------------------


@@ -222,7 +342,7 @@ private:
 };
 
 
 };
 
 

-class wxMemoryBuffer
+class WXDLLIMPEXP_BASE wxMemoryBuffer

 {
 public:
     // ctor and dtor
 {
 public:
     // ctor and dtor


@@ -244,9 +364,12 @@ public:
 
     wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
     {
 
     wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
     {

-        m_bufdata->DecRef();
-        m_bufdata = src.m_bufdata;
-        m_bufdata->IncRef();
+        if (&src != this)
+        {
+            m_bufdata->DecRef();
+            m_bufdata = src.m_bufdata;
+            m_bufdata->IncRef();
+        }

         return *this;
     }
 
         return *this;
     }