///////////////////////////////////////////////////////////////////////////////
-// 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 <string.h> // strdup()
-#include <wchar.h> // wcsdup()
+#include "wx/chartype.h"
+#include "wx/wxcrtbase.h"
+
+#ifndef __WXPALMOS5__
+#include <stdlib.h> // malloc() and free()
+#endif // ! __WXPALMOS5__
+
+class WXDLLIMPEXP_FWD_BASE wxCStrData;
// ----------------------------------------------------------------------------
// Special classes for (wide) character strings: they use malloc/free instead
// of new/delete
// ----------------------------------------------------------------------------
-class wxCharBuffer
+// helpers used by wxCharTypeBuffer
+namespace wxPrivate
+{
+
+struct UntypedBufferData
+{
+ enum Kind
+ {
+ Owned,
+ NonOwned
+ };
+
+ UntypedBufferData(void *str, Kind kind = Owned)
+ : m_str(str), m_ref(1), m_owned(kind == Owned) {}
+
+ ~UntypedBufferData()
+ {
+ if ( m_owned )
+ free(m_str);
+ }
+
+ void *m_str;
+
+ // "short" to have sizeof(Data)=8 on 32bit archs
+ unsigned short m_ref;
+
+ bool m_owned;
+};
+
+// this has to be defined inside the DLL (and not e.g. as a static variable
+// inside an inline function) as otherwise MSVC gives link errors when the
+// functions are effectively inlined (i.e. in non-debug build)
+//
+// NB: this is defined in string.cpp and not the (non-existent) buffer.cpp
+extern WXDLLIMPEXP_DATA_BASE(UntypedBufferData * const) untypedNullDataPtr;
+
+} // namespace wxPrivate
+
+template <typename T>
+class wxCharTypeBuffer
{
public:
- wxCharBuffer(const char *str)
+ typedef T CharType;
+
+ wxCharTypeBuffer(const CharType *str = NULL)
{
- wxASSERT_MSG( str, "NULL string in wxCharBuffer" );
+ if ( str )
+ m_data = new Data(wxStrdup(str));
+ else
+ m_data = GetNullData();
+ }
+
+ wxCharTypeBuffer(size_t len)
+ {
+ m_data = new Data((CharType *)malloc((len + 1)*sizeof(CharType)));
+ m_data->Get()[len] = (CharType)0;
+ }
+
+ static const wxCharTypeBuffer CreateNonOwned(const CharType *str)
+ {
+ wxCharTypeBuffer buf;
+ if ( str )
+ buf.m_data = new Data(wx_const_cast(CharType*, str), Data::NonOwned);
+ return buf;
+ }
- m_str = str ? strdup(str) : (char *)NULL;
+ ~wxCharTypeBuffer()
+ {
+ DecRef();
}
- // no need to check for NULL, free() does it
- ~wxCharBuffer() { free(m_str); }
+ // 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 == GetNullData() )
+ return NULL;
+
+ 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") );
+
+ CharType * const p = m_data->Get();
+
+ wxCharTypeBuffer *self = wx_const_cast(wxCharTypeBuffer*, this);
+ self->m_data->Set(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 == GetNullData() )
+ {
+ m_data = new Data(str);
+ }
+ else
+ {
+ m_data->Set(str);
+ m_data->m_owned = true;
+ }
+
+ return true;
+ }
+
+ CharType *data() { return m_data->Get(); }
+ const CharType *data() const { return m_data->Get(); }
+ operator const CharType *() const { return data(); }
+ CharType operator[](size_t n) const { return data()[n]; }
+
+private:
+ // reference-counted data
+ struct Data : wxPrivate::UntypedBufferData
+ {
+ Data(CharType *str, Kind kind = Owned)
+ : UntypedBufferData(str, kind)
+ {
+ }
+
+ CharType *Get() const { return static_cast<CharType *>(m_str); }
+ void Set(CharType *str) { m_str = str; }
+ };
+
+ // placeholder for NULL string, to simplify this code
+ static Data *GetNullData()
+ {
+ return static_cast<Data *>(wxPrivate::untypedNullDataPtr);
+ }
+
+ void IncRef()
+ {
+ if ( m_data == GetNullData() ) // exception, not ref-counted
+ return;
+ m_data->m_ref++;
+ }
+
+ void DecRef()
+ {
+ if ( m_data == GetNullData() ) // exception, not ref-counted
+ return;
+ if ( --m_data->m_ref == 0 )
+ delete m_data;
+ m_data = GetNullData();
+ }
+
+private:
+ Data *m_data;
+};
+
+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<char> )
+
+class wxCharBuffer : public wxCharTypeBuffer<char>
+{
+public:
+ 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
+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<wchar_t> )
+
+class 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;
- operator const char *() const { return m_str; }
+#if wxUSE_UNICODE
+ #define wxWxCharBuffer wxWCharBuffer
+
+ #define wxMB2WXbuf wxWCharBuffer
+ #define wxWX2MBbuf wxCharBuffer
+ #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)
+// ----------------------------------------------------------------------------
+
+// This class manages the actual data buffer pointer and is ref-counted.
+class wxMemoryBufferData
+{
+public:
+ // 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:
- char *m_str;
+ wxMemoryBufferData(size_t size = wxMemoryBufferData::DefBufSize)
+ : m_data(size ? malloc(size) : NULL), m_size(size), m_len(0), m_ref(0)
+ {
+ }
+ ~wxMemoryBufferData() { free(m_data); }
+
+
+ void ResizeIfNeeded(size_t newSize)
+ {
+ 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;
+ }
+ }
+
+ void IncRef() { m_ref += 1; }
+ void DecRef()
+ {
+ m_ref -= 1;
+ if (m_ref == 0) // are there no more references?
+ delete this;
+ }
+
+
+ // 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 wxWCharBuffer
+
+class wxMemoryBuffer
{
public:
- wxWCharBuffer(const wchar_t *wcs)
+ // ctor and dtor
+ wxMemoryBuffer(size_t size = wxMemoryBufferData::DefBufSize)
{
- wxASSERT_MSG( wcs, "NULL string in wxWCharBuffer" );
+ m_bufdata = new wxMemoryBufferData(size);
+ m_bufdata->IncRef();
+ }
- m_wcs = wcs ? wcsdup(wcs) : (wchar_t *)NULL;
+ ~wxMemoryBuffer() { m_bufdata->DecRef(); }
+
+
+ // copy and assignment
+ wxMemoryBuffer(const wxMemoryBuffer& src)
+ : m_bufdata(src.m_bufdata)
+ {
+ m_bufdata->IncRef();
}
- // no need to check for NULL, free() does it
- ~wxWCharBuffer() { free(m_wcs); }
+ wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
+ {
+ if (&src != this)
+ {
+ m_bufdata->DecRef();
+ m_bufdata = src.m_bufdata;
+ m_bufdata->IncRef();
+ }
+ return *this;
+ }
+
+
+ // 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; }
+
+ void SetBufSize(size_t size) { m_bufdata->ResizeIfNeeded(size); }
+ void SetDataLen(size_t len)
+ {
+ wxASSERT(len <= m_bufdata->m_size);
+ m_bufdata->m_len = len;
+ }
+
+ // Ensure the buffer is big enough and return a pointer to it
+ void *GetWriteBuf(size_t sizeNeeded)
+ {
+ m_bufdata->ResizeIfNeeded(sizeNeeded);
+ return m_bufdata->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)
+ {
+ m_bufdata->ResizeIfNeeded(m_bufdata->m_len + sizeNeeded);
+ return (char*)m_bufdata->m_data + m_bufdata->m_len;
+ }
+
+ // Update the length after the append
+ void UngetAppendBuf(size_t sizeUsed)
+ {
+ SetDataLen(m_bufdata->m_len + sizeUsed);
+ }
+
+ // Other ways to append to the buffer
+ void AppendByte(char data)
+ {
+ 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;
+ }
+
+ void AppendData(const void *data, size_t len)
+ {
+ memcpy(GetAppendBuf(len), data, len);
+ UngetAppendBuf(len);
+ }
- operator const wchar_t *() const { return m_wcs; }
+ operator const char *() const { return (const char*)GetData(); }
private:
- wchar_t *m_wcs;
+ wxMemoryBufferData* m_bufdata;
};
// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff