X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/01357b50cd8ff6b109bb1173cfa56527db5c45b1..11c5b47d9454915aa790ded6cf03613b9e2df12c:/include/wx/buffer.h?ds=sidebyside diff --git a/include/wx/buffer.h b/include/wx/buffer.h index c2aaa0c09b..85c986a3e9 100644 --- a/include/wx/buffer.h +++ b/include/wx/buffer.h @@ -1,12 +1,12 @@ /////////////////////////////////////////////////////////////////////////////// -// 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 -// Licence: wxWindows license +// Licence: wxWindows licence /////////////////////////////////////////////////////////////////////////////// // these classes are for private use only for now, they're not documented @@ -16,115 +16,254 @@ #include "wx/wxchar.h" -#include // strdup +#include // malloc() and free() // ---------------------------------------------------------------------------- // Special classes for (wide) character strings: they use malloc/free instead // of new/delete // ---------------------------------------------------------------------------- -class wxCharBuffer +#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: - wxCharBuffer(const char *str) + // 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) { - wxASSERT_MSG( str, wxT("NULL string in wxCharBuffer") ); + } + ~wxMemoryBufferData() { free(m_data); } + - m_str = str ? strdup(str) : (char *)NULL; + 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; + } } - wxCharBuffer(size_t len) + + void IncRef() { m_ref += 1; } + void DecRef() { - m_str = (char *)malloc(len+1); - m_str[len] = '\0'; + m_ref -= 1; + if (m_ref == 0) // are there no more references? + delete this; } - // 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; - } - - const char *data() const { return m_str; } - operator const char *() const { return m_str; } - char operator[](size_t n) const { return m_str[n]; } -private: - char *m_str; + + // 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) }; -#if wxUSE_WCHAR_T -class wxWCharBuffer + +class wxMemoryBuffer { public: - wxWCharBuffer(const wchar_t *wcs) + // ctor and dtor + wxMemoryBuffer(size_t size = wxMemoryBufferData::BLOCK_SIZE) { - wxASSERT_MSG( wcs, wxT("NULL string in wxWCharBuffer") ); - - if (wcs) { -#if ( defined(__BORLANDC__) && (__BORLANDC__ > 0x530) ) \ - || ( defined(__MWERKS__) && defined(__WXMSW__) ) - size_t siz = (std::wcslen(wcs)+1)*sizeof(wchar_t); -#else - size_t siz = (::wcslen(wcs)+1)*sizeof(wchar_t); -#endif - m_wcs = (wchar_t *)malloc(siz); - memcpy(m_wcs, wcs, siz); - } - else m_wcs = (wchar_t *)NULL; + m_bufdata = new wxMemoryBufferData(size); + m_bufdata->IncRef(); } - wxWCharBuffer(size_t len) + + ~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) { - m_wcs = (wchar_t *)malloc((len+1)*sizeof(wchar_t)); - m_wcs[len] = L'\0'; + memcpy(GetAppendBuf(len), data, len); + UngetAppendBuf(len); } - // no need to check for NULL, free() does it - ~wxWCharBuffer() { free(m_wcs); } - - 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; - } - - 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]; } + operator const char *() const { return (const char*)GetData(); } private: - wchar_t *m_wcs; + wxMemoryBufferData* m_bufdata; }; -#endif - -#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 // ---------------------------------------------------------------------------- // template class for any kind of data