655719367a
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27408 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
275 lines
11 KiB
C++
275 lines
11 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
// 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 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 <stdlib.h> // malloc() and free()
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// Special classes for (wide) character strings: they use malloc/free instead
|
|
// of new/delete
|
|
// ----------------------------------------------------------------------------
|
|
|
|
#define DEFINE_BUFFER(classname, chartype, strdupfunc) \
|
|
class classname \
|
|
{ \
|
|
public: \
|
|
classname(const chartype *str) \
|
|
: m_str(str ? strdupfunc(str) : NULL) \
|
|
{ \
|
|
} \
|
|
\
|
|
classname(size_t len) \
|
|
: m_str((chartype *)malloc((len + 1)*sizeof(chartype))) \
|
|
{ \
|
|
m_str[len] = (chartype)0; \
|
|
} \
|
|
\
|
|
/* no need to check for NULL, free() does it */ \
|
|
~classname() { free(m_str); } \
|
|
\
|
|
/* \
|
|
WARNING: \
|
|
\
|
|
the copy ctor and assignment operators change the passed in object \
|
|
even although it is declared as "const", so: \
|
|
\
|
|
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 classname 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 \
|
|
{ \
|
|
chartype *p = m_str; \
|
|
((classname *)this)->m_str = NULL; \
|
|
return p; \
|
|
} \
|
|
\
|
|
classname(const classname& src) \
|
|
: m_str(src.release()) \
|
|
{ \
|
|
} \
|
|
\
|
|
classname& operator=(const chartype *str) \
|
|
{ \
|
|
free(m_str); \
|
|
m_str = str ? strdupfunc(str) : NULL; \
|
|
return *this; \
|
|
} \
|
|
\
|
|
classname& operator=(const classname& src) \
|
|
{ \
|
|
free(m_str); \
|
|
m_str = src.release(); \
|
|
\
|
|
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]; } \
|
|
\
|
|
private: \
|
|
chartype *m_str; \
|
|
}
|
|
|
|
DEFINE_BUFFER(wxCharBuffer, char, wxStrdupA);
|
|
|
|
#if wxUSE_WCHAR_T
|
|
|
|
DEFINE_BUFFER(wxWCharBuffer, wchar_t, wxStrdupW);
|
|
|
|
#endif // wxUSE_WCHAR_T
|
|
|
|
#undef DEFINE_BUFFER
|
|
|
|
#if wxUSE_UNICODE
|
|
#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)
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// 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 { BLOCK_SIZE = 1024 };
|
|
|
|
friend class wxMemoryBuffer;
|
|
|
|
// everyting is private as it can only be used by wxMemoryBuffer
|
|
private:
|
|
wxMemoryBufferData(size_t size = wxMemoryBufferData::BLOCK_SIZE)
|
|
: 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::BLOCK_SIZE);
|
|
if ( !m_data )
|
|
{
|
|
free(dataOld);
|
|
}
|
|
|
|
m_size = newSize + wxMemoryBufferData::BLOCK_SIZE;
|
|
}
|
|
}
|
|
|
|
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::BLOCK_SIZE)
|
|
{
|
|
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(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
|
|
// ----------------------------------------------------------------------------
|
|
|
|
// TODO
|
|
|
|
#endif // _WX_BUFFER_H
|