A few tweaks and cleanups

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

diff --git a/include/wx/buffer.h b/include/wx/buffer.h
index b91a6cfc7831e6ca7c5e4b2f8bb2c17bec9d75ef..dac2adf1bdc2a681970141424bd2ac85bfc61e00 100644 (file)
--- a/include/wx/buffer.h
+++ b/include/wx/buffer.h
@@ -54,6 +54,7 @@ public:
      return *this;
    }
 
+   const char *data() const { return m_str; }
    operator const char *() const { return m_str; }
    char operator[](size_t n) const { return m_str[n]; }
 
@@ -70,7 +71,12 @@ public:
         wxASSERT_MSG( wcs, wxT("NULL string in wxWCharBuffer") );
 
         if (wcs) {
-          size_t siz = (wcslen(wcs)+1)*sizeof(wchar_t);
+#if ( defined(__BORLANDC__) && (__BORLANDC__ > 0x530) ) \
+    || ( defined(__MWERKS__) && defined(__WXMSW__) )
+          size_t siz = (std::wcslen(wcs)+1)*sizeof(wchar_t);
+#else
+          size_t siz = (::wcslen(wcs)+1)*sizeof(wchar_t);
+#endif
           m_wcs = (wchar_t *)malloc(siz);
           memcpy(m_wcs, wcs, siz);
         }
@@ -99,6 +105,7 @@ public:
      return *this;
    }
 
+   const wchar_t *data() const { return m_wcs; }
    operator const wchar_t *() const { return m_wcs; }
    wchar_t operator[](size_t n) const { return m_wcs[n]; }
 
@@ -119,6 +126,119 @@ private:
     #define wxWX2WCbuf wxWCharBuffer
 #endif // Unicode/ANSI
 
+
+
+// ----------------------------------------------------------------------------
+// A class for holding growable data buffers (not necessarily strings)
+// ----------------------------------------------------------------------------
+
+class wxMemoryBuffer
+{
+public:
+    enum { BLOCK_SIZE = 1024 };
+    wxMemoryBuffer(size_t size=wxMemoryBuffer::BLOCK_SIZE)
+    {
+        wxASSERT(size > 0);
+        m_data = malloc(size);
+        wxASSERT(m_data != NULL);
+        m_size = size;
+        m_len  = 0;
+    }
+
+    ~wxMemoryBuffer() { free(m_data); }
+
+    // Accessors
+    void*  GetData() const    { return m_data; }
+    size_t GetBufSize() const { return m_size; }
+    size_t GetDataLen() const { return m_len; }
+
+    void   SetBufSize(size_t size) { ResizeIfNeeded(size); }
+    void   SetDataLen(size_t len)
+    {
+        wxASSERT(len <= m_size);
+        m_len = len;
+    }
+
+    // Ensure the buffer is big enough and return a pointer to it
+    void* GetWriteBuf(size_t sizeNeeded)
+    {
+        ResizeIfNeeded(sizeNeeded);
+        return m_data;
+    }
+    // Update the length after the write
+    void  UngetWriteBuf(size_t sizeUsed) { SetDataLen(sizeUsed); }
+
+    // Like the above, but appends to the buffer
+    void* GetAppendBuf(size_t sizeNeeded)
+    {
+        ResizeIfNeeded(m_len + sizeNeeded);
+        return (char*)m_data + m_len;
+    }
+    void  UngetAppendBuf(size_t sizeUsed) { SetDataLen(m_len + sizeUsed); }
+
+    // Other ways to append to the buffer
+    void  AppendByte(char data) {
+        ResizeIfNeeded(m_len + 1);
+        *(((char*)m_data)+m_len) = data;
+        m_len += 1;
+    }
+    void  AppendData(void* data, size_t len)
+    {
+        memcpy(GetAppendBuf(len), data, len);
+        UngetAppendBuf(len);
+    }
+
+    operator const char *() const { return (const char*)m_data; }
+
+
+    // Copy and assignment
+    wxMemoryBuffer(const wxMemoryBuffer& src)
+    {
+        m_data = src.m_data;
+        m_size = src.m_size;
+        m_len  = src.m_len;
+
+        // no reference count yet...
+        ((wxMemoryBuffer*)&src)->m_data = NULL;
+        ((wxMemoryBuffer*)&src)->m_size = 0;
+        ((wxMemoryBuffer*)&src)->m_len  = 0;
+    }
+
+    wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
+    {
+        m_data = src.m_data;
+        m_size = src.m_size;
+        m_len  = src.m_len;
+
+        // no reference count yet...
+        ((wxMemoryBuffer*)&src)->m_data = NULL;
+        ((wxMemoryBuffer*)&src)->m_size = 0;
+        ((wxMemoryBuffer*)&src)->m_len  = 0;
+
+        return *this;
+   }
+
+
+protected:
+
+    void ResizeIfNeeded(size_t newSize)
+    {
+        if (newSize > m_size)
+        {
+            m_data = realloc(m_data, newSize + wxMemoryBuffer::BLOCK_SIZE);
+            wxASSERT(m_data != NULL);
+            m_size = newSize + wxMemoryBuffer::BLOCK_SIZE;
+        }
+    }
+
+private:
+    void*       m_data;
+    size_t      m_size;
+    size_t      m_len;
+};
+
+
+
 // ----------------------------------------------------------------------------
 // template class for any kind of data
 // ----------------------------------------------------------------------------