X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/7a3e402c11cee61059e515e8a82d52fe285e69b7..b61af837173f420baa18384710a6caea6d1fa057:/include/wx/buffer.h diff --git a/include/wx/buffer.h b/include/wx/buffer.h index 67d23526d6..3d7d6403f6 100644 --- a/include/wx/buffer.h +++ b/include/wx/buffer.h @@ -1,120 +1,374 @@ /////////////////////////////////////////////////////////////////////////////// -// 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 - #ifndef _WX_BUFFER_H #define _WX_BUFFER_H -#include "wx/wxchar.h" -#include // strdup +#include "wx/chartype.h" +#include "wx/wxcrtbase.h" + +#include // malloc() and free() + +class WXDLLIMPEXP_FWD_BASE wxCStrData; // ---------------------------------------------------------------------------- // Special classes for (wide) character strings: they use malloc/free instead // of new/delete // ---------------------------------------------------------------------------- -class wxCharBuffer +template +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, _T("NULL string in wxCharBuffer") ); + } + + wxCharTypeBuffer(size_t len) + : m_str((CharType *)malloc((len + 1)*sizeof(CharType))), + m_owned(true) + { + m_str[len] = (CharType)0; + } - m_str = str ? strdup(str) : (char *)NULL; + static const wxCharTypeBuffer CreateNonOwned(const CharType *str) + { + wxCharTypeBuffer buf; + buf.m_str = wx_const_cast(CharType*, str); + buf.m_owned = false; + return buf; } - wxCharBuffer(size_t len) + + /* no need to check for NULL, free() does it */ + ~wxCharTypeBuffer() { - m_str = (char *)malloc(len+1); - m_str[len] = '\0'; + if ( m_owned) + free(m_str); } - // 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; - } + /* + 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 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( m_owned, _T("can't release non-owned buffer") ); + return DoRelease(); + } + + void reset() + { + if ( m_owned ) + free(m_str); + m_str = NULL; + } + + wxCharTypeBuffer(const wxCharTypeBuffer& src) + { + CopyFrom(src); + } + + 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) + { + if ( m_owned ) + free(m_str); + CopyFrom(src); + return *this; + } + + 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; + } + + 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 char *() const { return m_str; } private: - char *m_str; + 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 +{ +public: + typedef wxCharTypeBuffer 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 +class wxWCharBuffer : public wxCharTypeBuffer +{ +public: + typedef wxCharTypeBuffer 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 implicitly convertible to T* +template +class wxWritableCharTypeBuffer : public wxCharTypeBuffer +{ +public: + typedef typename wxCharTypeBuffer::CharType CharType; + + wxWritableCharTypeBuffer(const wxCharTypeBuffer& src) + : wxCharTypeBuffer(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(str) {} + + operator CharType*() { return this->data(); } +}; + +typedef wxWritableCharTypeBuffer wxWritableCharBuffer; +typedef wxWritableCharTypeBuffer wxWritableWCharBuffer; + + +#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 + +// ---------------------------------------------------------------------------- +// 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: - wxWCharBuffer(const wchar_t *wcs) + // 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) { - wxASSERT_MSG( wcs, _T("NULL string in wxWCharBuffer") ); + } + ~wxMemoryBufferData() { free(m_data); } - if (wcs) { - size_t siz = (wcslen(wcs)+1)*sizeof(wchar_t); - m_wcs = (wchar_t *)malloc(siz); - memcpy(m_wcs, wcs, siz); + + 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; } - else m_wcs = (wchar_t *)NULL; } - wxWCharBuffer(size_t len) + + void IncRef() { m_ref += 1; } + void DecRef() { - m_wcs = (wchar_t *)malloc((len+1)*sizeof(wchar_t)); - m_wcs[len] = L'\0'; + m_ref -= 1; + if (m_ref == 0) // are there no more references? + delete this; } - // 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; - } + // the buffer containing the data + void *m_data; - operator const wchar_t *() const { return m_wcs; } + // the size of the buffer + size_t m_size; -private: - wchar_t *m_wcs; + // the amount of data currently in the buffer + size_t m_len; + + // the reference count + size_t m_ref; + + DECLARE_NO_COPY_CLASS(wxMemoryBufferData) }; -#endif -#if wxUSE_UNICODE -#define wxMB2WXbuf wxWCharBuffer -#define wxWX2MBbuf wxCharBuffer -#define wxWC2WXbuf wxChar* -#define wxWX2WCbuf wxChar* -#else -#define wxMB2WXbuf wxChar* -#define wxWX2MBbuf wxChar* -#define wxWC2WXbuf wxCharBuffer -#define wxWX2WCbuf wxWCharBuffer -#endif + +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