///////////////////////////////////////////////////////////////////////////////
-// 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"
+
+#include <stdlib.h> // malloc() and free()
-#include <string.h> // strdup
+class WXDLLIMPEXP_BASE wxCStrData;
// ----------------------------------------------------------------------------
// Special classes for (wide) character strings: they use malloc/free instead
// of new/delete
// ----------------------------------------------------------------------------
-class wxCharBuffer
+template <typename T>
+class wxCharTypeBuffer
{
public:
- wxCharBuffer(const char *str)
+ typedef T CharType;
+
+ wxCharTypeBuffer(const CharType *str = NULL)
+ : m_str(str ? wxStrdup(str) : NULL),
+ m_owned(true)
{
- wxASSERT_MSG( str, wxT("NULL string in wxCharBuffer") );
+ }
- m_str = str ? strdup(str) : (char *)NULL;
+ wxCharTypeBuffer(size_t len)
+ : m_str((CharType *)malloc((len + 1)*sizeof(CharType))),
+ m_owned(true)
+ {
+ m_str[len] = (CharType)0;
}
- wxCharBuffer(size_t len)
+
+ static const wxCharTypeBuffer CreateNonOwned(const CharType *str)
{
- m_str = (char *)malloc(len+1);
- m_str[len] = '\0';
+ wxCharTypeBuffer buf;
+ buf.m_str = wx_const_cast(CharType*, str);
+ buf.m_owned = false;
+ 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;
- }
+ /* no need to check for NULL, free() does it */
+ ~wxCharTypeBuffer()
+ {
+ if ( m_owned)
+ free(m_str);
+ }
- operator const char *() const { return m_str; }
- char operator[](size_t n) const { return m_str[n]; }
+ /*
+ WARNING:
-private:
- char *m_str;
-};
+ the copy ctor and assignment operators change the passed in object
+ even although it is declared as "const", so:
-#if wxUSE_WCHAR_T
-class wxWCharBuffer
-{
-public:
- wxWCharBuffer(const wchar_t *wcs)
+ a) it shouldn't be really const
+ b) you shouldn't use it afterwards (or know that it was reset)
+
+ 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...)
+ */
+
+ /*
+ because of the remark above, release() is declared const even if it
+ isn't really const
+ */
+ CharType *release() const
{
- wxASSERT_MSG( wcs, wxT("NULL string in wxWCharBuffer") );
+ wxASSERT_MSG( m_owned, _T("can't release non-owned buffer") );
+ return DoRelease();
+ }
- if (wcs) {
- size_t siz = (wcslen(wcs)+1)*sizeof(wchar_t);
- m_wcs = (wchar_t *)malloc(siz);
- memcpy(m_wcs, wcs, siz);
- }
- else m_wcs = (wchar_t *)NULL;
+ void reset()
+ {
+ if ( m_owned )
+ free(m_str);
+ m_str = NULL;
+ }
+
+ wxCharTypeBuffer(const wxCharTypeBuffer& src)
+ {
+ CopyFrom(src);
}
- wxWCharBuffer(size_t len)
+
+ wxCharTypeBuffer& operator=(const CharType *str)
+ {
+ if ( m_owned )
+ free(m_str);
+ m_str = str ? wxStrdup(str) : NULL;
+ m_owned = true;
+ return *this;
+ }
+
+ wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src)
{
- m_wcs = (wchar_t *)malloc((len+1)*sizeof(wchar_t));
- m_wcs[len] = L'\0';
+ if ( m_owned )
+ free(m_str);
+ CopyFrom(src);
+ return *this;
}
- // no need to check for NULL, free() does it
- ~wxWCharBuffer() { free(m_wcs); }
+ bool extend(size_t len)
+ {
+ wxASSERT_MSG( m_owned, _T("cannot extend non-owned buffer") );
+
+ CharType *
+ str = (CharType *)realloc(m_str, (len + 1)*sizeof(CharType));
+ if ( !str )
+ return false;
+
+ m_str = str;
+
+ return true;
+ }
- 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;
- }
+ 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]; }
- operator const wchar_t *() const { return m_wcs; }
- wchar_t operator[](size_t n) const { return m_wcs[n]; }
private:
- wchar_t *m_wcs;
+ CharType *DoRelease() const
+ {
+ CharType *p = m_str;
+ ((wxCharTypeBuffer *)this)->m_str = NULL;
+ return p;
+ }
+
+ void CopyFrom(const wxCharTypeBuffer& src)
+ {
+ m_owned = src.m_owned;
+ m_str = src.DoRelease();
+ }
+
+private:
+ CharType *m_str;
+ bool m_owned;
+};
+
+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
+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(); }
};
-#endif
+
+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
+// ----------------------------------------------------------------------------
+// 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:
+ 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 wxMemoryBuffer
+{
+public:
+ // ctor and dtor
+ wxMemoryBuffer(size_t size = wxMemoryBufferData::DefBufSize)
+ {
+ m_bufdata = new wxMemoryBufferData(size);
+ m_bufdata->IncRef();
+ }
+
+ ~wxMemoryBuffer() { m_bufdata->DecRef(); }
+
+
+ // copy and assignment
+ wxMemoryBuffer(const wxMemoryBuffer& src)
+ : m_bufdata(src.m_bufdata)
+ {
+ m_bufdata->IncRef();
+ }
+
+ wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
+ {
+ 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 char *() const { return (const char*)GetData(); }
+
+private:
+ wxMemoryBufferData* m_bufdata;
+};
+
// ----------------------------------------------------------------------------
// template class for any kind of data
// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff