// of new/delete
// ----------------------------------------------------------------------------
+// helpers used by wxCharTypeBuffer
+namespace wxPrivate
+{
+
+struct UntypedBufferData
+{
+ enum Kind
+ {
+ Owned,
+ NonOwned
+ };
+
+ UntypedBufferData(void *str, size_t len, Kind kind = Owned)
+ : m_str(str), m_length(len), m_ref(1), m_owned(kind == Owned) {}
+
+ ~UntypedBufferData()
+ {
+ if ( m_owned )
+ free(m_str);
+ }
+
+ void *m_str;
+ size_t m_length;
+
+ // "short" to have sizeof(Data)=12 on 32bit archs
+ unsigned short m_ref;
+
+ bool m_owned;
+};
+
+// NB: this is defined in string.cpp and not the (non-existent) buffer.cpp
+WXDLLIMPEXP_BASE UntypedBufferData * GetUntypedNullData();
+
+} // namespace wxPrivate
+
+
+// Reference-counted character buffer for storing string data. The buffer
+// is only valid for as long as the "parent" object that provided the data
+// is valid; see wxCharTypeBuffer<T> for persistent variant.
template <typename T>
-class WXDLLIMPEXP_BASE wxCharTypeBuffer
+class wxScopedCharTypeBuffer
{
public:
typedef T CharType;
- wxCharTypeBuffer(const CharType *str = NULL)
- : m_str(str ? wxStrdup(str) : NULL),
- m_owned(true)
+ wxScopedCharTypeBuffer()
{
+ m_data = GetNullData();
}
- wxCharTypeBuffer(size_t len)
- : m_str((CharType *)malloc((len + 1)*sizeof(CharType))),
- m_owned(true)
+ // Creates "non-owned" buffer, i.e. 'str' is not owned by the buffer
+ // and doesn't get freed by dtor. Used e.g. to point to wxString's internal
+ // storage.
+ static
+ const wxScopedCharTypeBuffer CreateNonOwned(const CharType *str,
+ size_t len = wxNO_LEN)
{
- m_str[len] = (CharType)0;
+ if ( len == wxNO_LEN )
+ len = wxStrlen(str);
+
+ wxScopedCharTypeBuffer buf;
+ if ( str )
+ buf.m_data = new Data(const_cast<CharType*>(str), len, Data::NonOwned);
+ return buf;
}
- static const wxCharTypeBuffer CreateNonOwned(const CharType *str)
+ // Creates "owned" buffer, i.e. takes over ownership of 'str' and frees it
+ // in dtor (if ref.count reaches 0).
+ static
+ const wxScopedCharTypeBuffer CreateOwned(CharType *str,
+ size_t len = wxNO_LEN )
{
- wxCharTypeBuffer buf;
- buf.m_str = wx_const_cast(CharType*, str);
- buf.m_owned = false;
+ if ( len == wxNO_LEN )
+ len = wxStrlen(str);
+
+ wxScopedCharTypeBuffer buf;
+ if ( str )
+ buf.m_data = new Data(str, len);
return buf;
}
- /* no need to check for NULL, free() does it */
- ~wxCharTypeBuffer()
+ wxScopedCharTypeBuffer(const wxScopedCharTypeBuffer& src)
{
- if ( m_owned)
- free(m_str);
+ m_data = src.m_data;
+ IncRef();
}
- /*
- WARNING:
+ wxScopedCharTypeBuffer& operator=(const wxScopedCharTypeBuffer& src)
+ {
+ if ( &src == this )
+ return *this;
- the copy ctor and assignment operators change the passed in object
- even although it is declared as "const", so:
+ DecRef();
+ m_data = src.m_data;
+ IncRef();
- a) it shouldn't be really const
- b) you shouldn't use it afterwards (or know that it was reset)
+ return *this;
+ }
- 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...)
- */
+ ~wxScopedCharTypeBuffer()
+ {
+ DecRef();
+ }
- /*
- because of the remark above, release() is declared const even if it
- isn't really const
- */
+ // 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
{
- wxASSERT_MSG( m_owned, _T("can't release non-owned buffer") );
- return DoRelease();
+ if ( m_data == GetNullData() )
+ return NULL;
+
+ wxASSERT_MSG( m_data->m_owned, wxT("can't release non-owned buffer") );
+ wxASSERT_MSG( m_data->m_ref == 1, wxT("can't release shared buffer") );
+
+ CharType * const p = m_data->Get();
+
+ wxScopedCharTypeBuffer *self = const_cast<wxScopedCharTypeBuffer*>(this);
+ self->m_data->Set(NULL, 0);
+ self->DecRef();
+
+ return p;
}
void reset()
{
- if ( m_owned )
- free(m_str);
- m_str = NULL;
+ DecRef();
}
- wxCharTypeBuffer(const wxCharTypeBuffer& src)
+ 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]; }
+
+ size_t length() const { return m_data->m_length; }
+
+protected:
+ // reference-counted data
+ struct Data : public wxPrivate::UntypedBufferData
{
- CopyFrom(src);
+ Data(CharType *str, size_t len, Kind kind = Owned)
+ : wxPrivate::UntypedBufferData(str, len, kind)
+ {
+ }
+
+ CharType *Get() const { return static_cast<CharType *>(m_str); }
+ void Set(CharType *str, size_t len)
+ {
+ m_str = str;
+ m_length = len;
+ }
+ };
+
+ // placeholder for NULL string, to simplify this code
+ static Data *GetNullData()
+ {
+ return static_cast<Data *>(wxPrivate::GetUntypedNullData());
+ }
+
+ 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();
+ }
+
+ // sets this object to a be copy of 'other'; if 'src' is non-owned,
+ // a deep copy is made and 'this' will contain new instance of the data
+ void MakeOwnedCopyOf(const wxScopedCharTypeBuffer& src)
+ {
+ this->DecRef();
+
+ if ( src.m_data == this->GetNullData() )
+ {
+ this->m_data = this->GetNullData();
+ }
+ else if ( src.m_data->m_owned )
+ {
+ this->m_data = src.m_data;
+ this->IncRef();
+ }
+ else
+ {
+ // if the scoped buffer had non-owned data, we have to make
+ // a copy here, because src.m_data->m_str is valid only for as long
+ // as 'src' exists
+ this->m_data = new Data
+ (
+ StrCopy(src.data(), src.length()),
+ src.length()
+ );
+ }
+ }
+
+ static CharType *StrCopy(const CharType *src, size_t len)
+ {
+ CharType *dst = (CharType*)malloc(sizeof(CharType) * (len + 1));
+ if ( dst )
+ memcpy(dst, src, sizeof(CharType) * (len + 1));
+ return dst;
+ }
+
+protected:
+ Data *m_data;
+};
+
+typedef wxScopedCharTypeBuffer<char> wxScopedCharBuffer;
+typedef wxScopedCharTypeBuffer<wchar_t> wxScopedWCharBuffer;
+
+
+// this buffer class always stores data in "owned" (persistent) manner
+template <typename T>
+class wxCharTypeBuffer : public wxScopedCharTypeBuffer<T>
+{
+protected:
+ typedef typename wxScopedCharTypeBuffer<T>::Data Data;
+
+public:
+ typedef T CharType;
+
+ wxCharTypeBuffer(const CharType *str = NULL, size_t len = wxNO_LEN)
+ {
+ if ( str )
+ {
+ if ( len == wxNO_LEN )
+ len = wxStrlen(str);
+ this->m_data = new Data(this->StrCopy(str, len), len);
+ }
+ else
+ {
+ this->m_data = this->GetNullData();
+ }
+ }
+
+ wxCharTypeBuffer(size_t len)
+ {
+ this->m_data =
+ new Data((CharType *)malloc((len + 1)*sizeof(CharType)), len);
+ this->m_data->Get()[len] = (CharType)0;
+ }
+
+ wxCharTypeBuffer(const wxCharTypeBuffer& src)
+ : wxScopedCharTypeBuffer<T>(src) {}
+
wxCharTypeBuffer& operator=(const CharType *str)
{
- if ( m_owned )
- free(m_str);
- m_str = str ? wxStrdup(str) : NULL;
- m_owned = true;
+ this->DecRef();
+
+ if ( str )
+ this->m_data = new Data(wxStrdup(str), wxStrlen(str));
return *this;
}
wxCharTypeBuffer& operator=(const wxCharTypeBuffer& src)
{
- if ( m_owned )
- free(m_str);
- CopyFrom(src);
+ wxScopedCharTypeBuffer<T>::operator=(src);
+ return *this;
+ }
+
+ wxCharTypeBuffer(const wxScopedCharTypeBuffer<T>& src)
+ {
+ this->MakeOwnedCopyOf(src);
+ }
+
+ wxCharTypeBuffer& operator=(const wxScopedCharTypeBuffer<T>& src)
+ {
+ MakeOwnedCopyOf(src);
return *this;
}
bool extend(size_t len)
{
- wxASSERT_MSG( m_owned, _T("cannot extend non-owned buffer") );
+ wxASSERT_MSG( this->m_data->m_owned, "cannot extend non-owned buffer" );
+ wxASSERT_MSG( this->m_data->m_ref == 1, "can't extend shared buffer" );
- CharType *
- str = (CharType *)realloc(m_str, (len + 1)*sizeof(CharType));
+ CharType *str =
+ (CharType *)realloc(this->data(), (len + 1) * sizeof(CharType));
if ( !str )
return false;
- m_str = str;
+ // For consistency with the ctor taking just the length, NUL-terminate
+ // the buffer.
+ str[len] = (CharType)0;
+
+ if ( this->m_data == this->GetNullData() )
+ {
+ this->m_data = new Data(str, len);
+ }
+ else
+ {
+ this->m_data->Set(str, len);
+ this->m_data->m_owned = true;
+ }
return true;
}
- 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]; }
-
-
-private:
- CharType *DoRelease() const
+ void shrink(size_t len)
{
- CharType *p = m_str;
- ((wxCharTypeBuffer *)this)->m_str = NULL;
- return p;
- }
+ wxASSERT_MSG( this->m_data->m_owned, "cannot shrink non-owned buffer" );
+ wxASSERT_MSG( this->m_data->m_ref == 1, "can't shrink shared buffer" );
- void CopyFrom(const wxCharTypeBuffer& src)
- {
- m_owned = src.m_owned;
- m_str = src.DoRelease();
- }
+ wxASSERT( len <= this->length() );
-private:
- CharType *m_str;
- bool m_owned;
+ this->m_data->m_length = len;
+ this->data()[len] = 0;
+ }
};
+WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxScopedCharTypeBuffer<char> )
WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<char> )
-class WXDLLIMPEXP_BASE wxCharBuffer : public wxCharTypeBuffer<char>
+class wxCharBuffer : public wxCharTypeBuffer<char>
{
public:
typedef wxCharTypeBuffer<char> wxCharTypeBufferBase;
+ typedef wxScopedCharTypeBuffer<char> wxScopedCharTypeBufferBase;
wxCharBuffer(const wxCharTypeBufferBase& buf)
: wxCharTypeBufferBase(buf) {}
+ wxCharBuffer(const wxScopedCharTypeBufferBase& 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( wxScopedCharTypeBuffer<wchar_t> )
WXDLLIMPEXP_TEMPLATE_INSTANCE_BASE( wxCharTypeBuffer<wchar_t> )
-class WXDLLIMPEXP_BASE wxWCharBuffer : public wxCharTypeBuffer<wchar_t>
+class wxWCharBuffer : public wxCharTypeBuffer<wchar_t>
{
public:
typedef wxCharTypeBuffer<wchar_t> wxCharTypeBufferBase;
+ typedef wxScopedCharTypeBuffer<wchar_t> wxScopedCharTypeBufferBase;
wxWCharBuffer(const wxCharTypeBufferBase& buf)
: wxCharTypeBufferBase(buf) {}
+ wxWCharBuffer(const wxScopedCharTypeBufferBase& 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;
+ typedef typename wxScopedCharTypeBuffer<T>::CharType CharType;
- wxWritableCharTypeBuffer(const wxCharTypeBuffer<T>& src)
+ wxWritableCharTypeBuffer(const wxScopedCharTypeBuffer<T>& src)
: wxCharTypeBuffer<T>(src) {}
// FIXME-UTF8: this won't be needed after converting mb_str()/wc_str() to
// always return a buffer
+ // + we should derive this class from wxScopedCharTypeBuffer
+ // then
wxWritableCharTypeBuffer(const CharType *str = NULL)
: wxCharTypeBuffer<T>(str) {}
friend class wxMemoryBuffer;
- // everyting is private as it can only be used by wxMemoryBuffer
+ // everything 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)
delete this;
}
+ void *release()
+ {
+ if ( m_data == NULL )
+ return NULL;
+
+ wxASSERT_MSG( m_ref == 1, "can't release shared buffer" );
+
+ void *p = m_data;
+ m_data = NULL;
+ m_len =
+ m_size = 0;
+
+ return p;
+ }
+
// the buffer containing the data
void *m_data;
// the reference count
size_t m_ref;
- DECLARE_NO_COPY_CLASS(wxMemoryBufferData)
+ wxDECLARE_NO_COPY_CLASS(wxMemoryBufferData);
};
-class WXDLLIMPEXP_BASE wxMemoryBuffer
+class wxMemoryBuffer
{
public:
// ctor and dtor
wxMemoryBuffer& operator=(const wxMemoryBuffer& src)
{
- m_bufdata->DecRef();
- m_bufdata = src.m_bufdata;
- m_bufdata->IncRef();
+ if (&src != this)
+ {
+ m_bufdata->DecRef();
+ m_bufdata = src.m_bufdata;
+ m_bufdata->IncRef();
+ }
return *this;
}
size_t GetBufSize() const { return m_bufdata->m_size; }
size_t GetDataLen() const { return m_bufdata->m_len; }
+ bool IsEmpty() const { return GetDataLen() == 0; }
+
void SetBufSize(size_t size) { m_bufdata->ResizeIfNeeded(size); }
void SetDataLen(size_t len)
{
m_bufdata->m_len = len;
}
+ void Clear() { SetDataLen(0); }
+
// Ensure the buffer is big enough and return a pointer to it
void *GetWriteBuf(size_t sizeNeeded)
{
// Other ways to append to the buffer
void AppendByte(char data)
{
- wxCHECK_RET( m_bufdata->m_data, _T("invalid wxMemoryBuffer") );
+ wxCHECK_RET( m_bufdata->m_data, wxT("invalid wxMemoryBuffer") );
m_bufdata->ResizeIfNeeded(m_bufdata->m_len + 1);
*(((char*)m_bufdata->m_data) + m_bufdata->m_len) = data;
operator const char *() const { return (const char*)GetData(); }
+ // gives up ownership of data, returns the pointer; after this call,
+ // data isn't freed by the buffer and its content is resent to empty
+ void *release()
+ {
+ return m_bufdata->release();
+ }
+
private:
wxMemoryBufferData* m_bufdata;
};
projects / wxWidgets.git / blobdiff