///////////////////////////////////////////////////////////////////////////////
-// Name: buffer.h
+// Name: wx/buffer.h
// Purpose: auto buffer classes: buffers which automatically free memory
// Author: Vadim Zeitlin
// Modified by:
// Created: 12.04.99
// RCS-ID: $Id$
// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
-// Licence: wxWindows license
+// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
-// these classes are for private use only for now, they're not documented
-
#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()
+#endif // ! __WXPALMOS5__
-#include <string.h> // strdup
+class WXDLLIMPEXP_FWD_BASE wxCStrData;
// ----------------------------------------------------------------------------
// Special classes for (wide) character strings: they use malloc/free instead
// of new/delete
// ----------------------------------------------------------------------------
-class wxCharBuffer
+template <typename T>
+class WXDLLIMPEXP_BASE wxCharTypeBuffer
{
public:
- wxCharBuffer(const char *str)
- : m_str(NULL)
+ typedef T CharType;
+
+ wxCharTypeBuffer(const CharType *str = NULL)
{
- wxASSERT_MSG( str, wxT("NULL string in wxCharBuffer") );
+ if ( str )
+ m_data = new Data(wxStrdup(str));
+ else
+ m_data = &NullData;
+ }
- m_str = str ? strdup(str) : (char *)NULL;
+ wxCharTypeBuffer(size_t len)
+ {
+ m_data = new Data((CharType *)malloc((len + 1)*sizeof(CharType)));
+ m_data->m_str[len] = (CharType)0;
}
- wxCharBuffer(size_t len)
- : m_str(NULL)
+
+ static const wxCharTypeBuffer CreateNonOwned(const CharType *str)
{
- m_str = (char *)malloc(len+1);
- m_str[len] = '\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
- ~wxCharBuffer() { free(m_str); }
- wxCharBuffer(const wxCharBuffer& src)
- : m_str(src.m_str)
- {
- // no reference count yet...
- ((wxCharBuffer*)&src)->m_str = (char *)NULL;
- }
- wxCharBuffer& operator=(const wxCharBuffer& src)
- {
- m_str = src.m_str;
- // no reference count yet...
- ((wxCharBuffer*)&src)->m_str = (char *)NULL;
- return *this;
- }
+ ~wxCharTypeBuffer()
+ {
+ DecRef();
+ }
- const char *data() const { return m_str; }
- operator const char *() const { return m_str; }
- char operator[](size_t n) const { return m_str[n]; }
+ // 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;
-private:
- char *m_str;
-};
+ 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") );
-#if wxUSE_WCHAR_T
-class wxWCharBuffer
-{
-public:
- wxWCharBuffer(const wchar_t *wcs)
- : m_wcs((wchar_t *)NULL)
+ CharType *p = m_data->m_str;
+
+ wxCharTypeBuffer *self = wx_const_cast(wxCharTypeBuffer*, this);
+ self->m_data->m_str = NULL;
+ self->DecRef();
+
+ return p;
+ }
+
+ void reset()
+ {
+ DecRef();
+ }
+
+ wxCharTypeBuffer(const wxCharTypeBuffer& src)
+ {
+ m_data = src.m_data;
+ IncRef();
+ }
+
+ wxCharTypeBuffer& operator=(const CharType *str)
+ {
+ DecRef();
+
+ if ( str )
+ m_data = new Data(wxStrdup(str));
+ return *this;
+ }
+
+ wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src)
+ {
+ if ( &src == this )
+ return *this;
+
+ DecRef();
+ m_data = src.m_data;
+ IncRef();
+
+ return *this;
+ }
+
+ bool extend(size_t len)
+ {
+ 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 ( m_data == &NullData )
+ {
+ m_data = new Data(str);
+ }
+ else
+ {
+ m_data->m_str = str;
+ m_data->m_owned = true;
+ }
+
+ return true;
+ }
+
+ 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:
+ // reference-counted data
+ struct Data
{
- wxASSERT_MSG( wcs, wxT("NULL string in wxWCharBuffer") );
+ 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);
+ }
- if (wcs) {
-#if ( defined(__BORLANDC__) && (__BORLANDC__ > 0x530) ) \
- || ( defined(__MWERKS__) && defined(__WXMSW__) )
- size_t siz = (std::wcslen(wcs)+1)*sizeof(wchar_t);
+ 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
- size_t siz = (::wcslen(wcs)+1)*sizeof(wchar_t);
+ // but Visual C++ doesn't like it
+ static Data NullData;
#endif
- m_wcs = (wchar_t *)malloc(siz);
- memcpy(m_wcs, wcs, siz);
- }
+
+ void IncRef()
+ {
+ if ( m_data == &NullData ) // exception, not ref-counted
+ return;
+ m_data->m_ref++;
}
- wxWCharBuffer(size_t len)
- : m_wcs((wchar_t *)NULL)
+
+ void DecRef()
{
- m_wcs = (wchar_t *)malloc((len+1)*sizeof(wchar_t));
- m_wcs[len] = L'\0';
+ if ( m_data == &NullData ) // exception, not ref-counted
+ return;
+ if ( --m_data->m_ref == 0 )
+ delete m_data;
+ m_data = &NullData;
}
- // no need to check for NULL, free() does it
- ~wxWCharBuffer() { free(m_wcs); }
+private:
+ Data *m_data;
+};
+
+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<char> )
- wxWCharBuffer(const wxWCharBuffer& src)
- : m_wcs(src.m_wcs)
- {
- // no reference count yet...
- ((wxWCharBuffer*)&src)->m_wcs = (wchar_t *)NULL;
- }
- wxWCharBuffer& operator=(const wxWCharBuffer& src)
- {
- m_wcs = src.m_wcs;
- // no reference count yet...
- ((wxWCharBuffer*)&src)->m_wcs = (wchar_t *)NULL;
- return *this;
- }
+class WXDLLIMPEXP_BASE wxCharBuffer : public wxCharTypeBuffer<char>
+{
+public:
+ typedef wxCharTypeBuffer<char> wxCharTypeBufferBase;
- 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]; }
+ wxCharBuffer(const wxCharTypeBufferBase& buf)
+ : wxCharTypeBufferBase(buf) {}
-private:
- wchar_t *m_wcs;
+ wxCharBuffer(const CharType *str = NULL) : wxCharTypeBufferBase(str) {}
+ wxCharBuffer(size_t len) : wxCharTypeBufferBase(len) {}
+
+ wxCharBuffer(const wxCStrData& cstr);
};
-#endif
+
+#if wxUSE_WCHAR_T
+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<wchar_t> )
+
+class WXDLLIMPEXP_BASE wxWCharBuffer : public wxCharTypeBuffer<wchar_t>
+{
+public:
+ 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
+
+// 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
+ #define wxWxCharBuffer wxWCharBuffer
+
#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
+ #define wxWxCharBuffer wxCharBuffer
+
#define wxMB2WXbuf wxChar*
#define wxWX2MBbuf wxChar*
#define wxWC2WXbuf wxCharBuffer
#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)
// ----------------------------------------------------------------------------
-class wxMemoryBuffer
+// This class manages the actual data buffer pointer and is ref-counted.
+class wxMemoryBufferData
{
public:
- enum { BLOCK_SIZE = 1024 };
- wxMemoryBuffer(size_t size=wxMemoryBuffer::BLOCK_SIZE)
- : m_data(NULL), m_size(0), m_len(0)
+ // the initial size and also the size added by ResizeIfNeeded()
+ enum { DefBufSize = 1024 };
+
+ friend class wxMemoryBuffer;
+
+ // everyting is private as it can only be used by wxMemoryBuffer
+private:
+ wxMemoryBufferData(size_t size = wxMemoryBufferData::DefBufSize)
+ : m_data(size ? malloc(size) : NULL), m_size(size), m_len(0), m_ref(0)
{
- wxASSERT(size > 0);
- m_data = malloc(size);
- wxASSERT(m_data != NULL);
- m_size = size;
}
+ ~wxMemoryBufferData() { free(m_data); }
- ~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)
+ void ResizeIfNeeded(size_t newSize)
{
- wxASSERT(len <= m_size);
- m_len = len;
+ if (newSize > m_size)
+ {
+ void *dataOld = m_data;
+ m_data = realloc(m_data, newSize + wxMemoryBufferData::DefBufSize);
+ if ( !m_data )
+ {
+ free(dataOld);
+ }
+
+ m_size = newSize + wxMemoryBufferData::DefBufSize;
+ }
}
- // Ensure the buffer is big enough and return a pointer to it
- void* GetWriteBuf(size_t sizeNeeded)
+ void IncRef() { m_ref += 1; }
+ void DecRef()
{
- ResizeIfNeeded(sizeNeeded);
- return m_data;
+ m_ref -= 1;
+ if (m_ref == 0) // are there no more references?
+ delete this;
}
- // 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)
+
+ // the buffer containing the data
+ void *m_data;
+
+ // the size of the buffer
+ size_t m_size;
+
+ // the amount of data currently in the buffer
+ size_t m_len;
+
+ // the reference count
+ size_t m_ref;
+
+ DECLARE_NO_COPY_CLASS(wxMemoryBufferData)
+};
+
+
+class WXDLLIMPEXP_BASE wxMemoryBuffer
+{
+public:
+ // ctor and dtor
+ wxMemoryBuffer(size_t size = wxMemoryBufferData::DefBufSize)
{
- ResizeIfNeeded(m_len + sizeNeeded);
- return (char*)m_data + m_len;
+ m_bufdata = new wxMemoryBufferData(size);
+ m_bufdata->IncRef();
}
- 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;
+ ~wxMemoryBuffer() { m_bufdata->DecRef(); }
+
+
+ // copy and assignment
+ wxMemoryBuffer(const wxMemoryBuffer& src)
+ : m_bufdata(src.m_bufdata)
+ {
+ m_bufdata->IncRef();
}
- void AppendData(void* data, size_t len)
+
+ wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
{
- memcpy(GetAppendBuf(len), data, len);
- UngetAppendBuf(len);
+ if (&src != this)
+ {
+ m_bufdata->DecRef();
+ m_bufdata = src.m_bufdata;
+ m_bufdata->IncRef();
+ }
+ return *this;
}
- operator const char *() const { return (const char*)m_data; }
+ // Accessors
+ void *GetData() const { return m_bufdata->m_data; }
+ size_t GetBufSize() const { return m_bufdata->m_size; }
+ size_t GetDataLen() const { return m_bufdata->m_len; }
- // Copy and assignment
- wxMemoryBuffer(const wxMemoryBuffer& src)
- : m_data(src.m_data), m_size(src.m_size), m_len(src.m_len)
+ void SetBufSize(size_t size) { m_bufdata->ResizeIfNeeded(size); }
+ void SetDataLen(size_t len)
{
- // no reference count yet...
- ((wxMemoryBuffer*)&src)->m_data = NULL;
- ((wxMemoryBuffer*)&src)->m_size = 0;
- ((wxMemoryBuffer*)&src)->m_len = 0;
+ wxASSERT(len <= m_bufdata->m_size);
+ m_bufdata->m_len = len;
}
- wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
+ // Ensure the buffer is big enough and return a pointer to it
+ void *GetWriteBuf(size_t sizeNeeded)
{
- 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;
+ m_bufdata->ResizeIfNeeded(sizeNeeded);
+ return m_bufdata->m_data;
+ }
- return *this;
- }
+ // 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)
+ {
+ m_bufdata->ResizeIfNeeded(m_bufdata->m_len + sizeNeeded);
+ return (char*)m_bufdata->m_data + m_bufdata->m_len;
+ }
-protected:
+ // Update the length after the append
+ void UngetAppendBuf(size_t sizeUsed)
+ {
+ SetDataLen(m_bufdata->m_len + sizeUsed);
+ }
- void ResizeIfNeeded(size_t newSize)
+ // Other ways to append to the buffer
+ void AppendByte(char data)
{
- if (newSize > m_size)
- {
- m_data = realloc(m_data, newSize + wxMemoryBuffer::BLOCK_SIZE);
- wxASSERT(m_data != NULL);
- m_size = newSize + wxMemoryBuffer::BLOCK_SIZE;
- }
+ wxCHECK_RET( m_bufdata->m_data, _T("invalid wxMemoryBuffer") );
+
+ m_bufdata->ResizeIfNeeded(m_bufdata->m_len + 1);
+ *(((char*)m_bufdata->m_data) + m_bufdata->m_len) = data;
+ m_bufdata->m_len += 1;
}
-private:
- void* m_data;
- size_t m_size;
- size_t m_len;
-};
+ void AppendData(const void *data, size_t len)
+ {
+ memcpy(GetAppendBuf(len), data, len);
+ UngetAppendBuf(len);
+ }
+ operator const char *() const { return (const char*)GetData(); }
+private:
+ wxMemoryBufferData* m_bufdata;
+};
// ----------------------------------------------------------------------------
// template class for any kind of data
projects / wxWidgets.git / blobdiff