A few tweaks and cleanups

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

diff --git a/include/wx/buffer.h b/include/wx/buffer.h
index 9bed7fca305a06c4bfdeadec200b4410ded4eba2..dac2adf1bdc2a681970141424bd2ac85bfc61e00 100644 (file)
--- a/include/wx/buffer.h
+++ b/include/wx/buffer.h
@@ -15,14 +15,8 @@
 #define _WX_BUFFER_H
 
 #include "wx/wxchar.h"
-#include <string.h> // strdup
 
-// wchar.h isn't available on my system (Linux, g++ 2.7.2). JACS.
-#ifdef __LINUX__
-#include <wcstr.h>
-#else
-#include <wchar.h>  // wchar_t
-#endif
+#include <string.h> // strdup
 
 // ----------------------------------------------------------------------------
 // Special classes for (wide) character strings: they use malloc/free instead
@@ -34,14 +28,14 @@ class wxCharBuffer
 public:
     wxCharBuffer(const char *str)
     {
-        wxASSERT_MSG( str, _T("NULL string in wxCharBuffer") );
+        wxASSERT_MSG( str, wxT("NULL string in wxCharBuffer") );
 
         m_str = str ? strdup(str) : (char *)NULL;
     }
     wxCharBuffer(size_t len)
     {
         m_str = (char *)malloc(len+1);
-       m_str[len] = '\0';
+        m_str[len] = '\0';
     }
     // no need to check for NULL, free() does it
    ~wxCharBuffer() { free(m_str); }
@@ -60,21 +54,29 @@ 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]; }
 
 private:
    char *m_str;
 };
 
+#if wxUSE_WCHAR_T
 class wxWCharBuffer
 {
 public:
     wxWCharBuffer(const wchar_t *wcs)
     {
-        wxASSERT_MSG( wcs, _T("NULL string in wxWCharBuffer") );
+        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);
         }
@@ -83,7 +85,7 @@ public:
     wxWCharBuffer(size_t len)
     {
         m_wcs = (wchar_t *)malloc((len+1)*sizeof(wchar_t));
-       m_wcs[len] = L'\0';
+        m_wcs[len] = L'\0';
     }
 
     // no need to check for NULL, free() does it
@@ -103,23 +105,139 @@ 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]; }
 
 private:
    wchar_t *m_wcs;
 };
+#endif
 
 #if wxUSE_UNICODE
-#define wxMB2WXbuf wxWCharBuffer
-#define wxWX2MBbuf wxCharBuffer
-#define wxWC2WXbuf wxChar*
-#define wxWX2WCbuf wxChar*
-#else
-#define wxMB2WXbuf wxChar*
-#define wxWX2MBbuf wxChar*
-#define wxWC2WXbuf wxCharBuffer
-#define wxWX2WCbuf wxWCharBuffer
-#endif
+    #define wxMB2WXbuf wxWCharBuffer
+    #define wxWX2MBbuf wxCharBuffer
+    #define wxWC2WXbuf wxChar*
+    #define wxWX2WCbuf wxChar*
+#else // ANSI
+    #define wxMB2WXbuf wxChar*
+    #define wxWX2MBbuf wxChar*
+    #define wxWC2WXbuf wxCharBuffer
+    #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