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Editor/XT/Include/XTMemFile.h Normal file
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// XTMemFile.h interface for the CXTMemFile class.
//
// This file is a part of the Xtreme Toolkit for MFC.
// <20>1998-2003 Codejock Software, All Rights Reserved.
//
// This source code can only be used under the terms and conditions
// outlined in the accompanying license agreement.
//
// support@codejock.com
// http://www.codejock.com
//---------------------------------------------------------------------------
// Used with permission Copyright <20> 1999 Maxallion
// XFile@maxallion.8m.com
//---------------------------------------------------------------------------
// ICQ# 32304418
//
// CCJMemFile - Extended Memory File - Beta - w/o a lot of error checking
// - Is used like a normal CFile or CStdioFile or CMemFile object
// - String Functions : ReadString, WriteString
// - Loads physical files into memory on creation and saves them back to disk on destruction
// - Can duplicate itself to other CFile derived objects
// - Has a Search function
// - can be read-accessed like an array
//
// OVERLOADED OPERATORS:
// = Imports from another file or sets file Position
// += Appends another file
// [] reads a byte like an array
//
//////////////////////////////////////////////////////////////////////
#if !defined(__XTMEMFILE_H__)
#define __XTMEMFILE_H__
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
//////////////////////////////////////////////////////////////////////
// Summary: CXTMemFile is a CMemFile derived class. It is used to create a CXTMemFile
// object to support memory files.
//
// These memory files behave like disk files except that the file is stored
// in RAM rather than on disk. A memory file is useful for fast temporary
// storage or for transferring raw bytes or serialized objects between
// independent processes.
//
// CXTMemFile objects can automatically allocate their own memory, or you
// can attach your own memory block to the CXTMemFile object by calling
// Attach. In either case, memory for growing the memory file automatically
// is allocated in nGrowBytes-sized increments if 'nGrowBytes' is not zero.
//
// The memory block will automatically be deleted upon destruction of the
// CXTMemFile object if the memory was originally allocated by the CXTMemFile
// object. Otherwise, you are responsible for de-allocating the memory you
// attached to the object.
//
// You can access the memory block through the pointer supplied when you
// detach it from the CXTMemFile object by calling Detach.
//
// The most common use of CXTMemFile is to create a CXTMemFile object and
// use it by calling CFile member functions. Note that creating a CXTMemFile
// automatically opens it: you do not call CFile::Open, which is only used
// for disk files. Because CXTMemFile doesn't use a disk file, the data
// member CFile::m_hFile is not used and has no meaning.
//
// The CFile member functions Duplicate, LockRange, and UnlockRange are
// not implemented for CXTMemFile. If you call these functions on a CXTMemFile
// object, you will get a CNotSupportedException.
//
// CXTMemFile uses the run-time library functions malloc, realloc, and
// free to allocate, reallocate, and deallocate memory, and the intrinsic
// memcpy to block copy memory when reading and writing. If you would like
// to change this behavior or the behavior when CXTMemFile grows a file,
// derive your own class from CXTMemFile and override the appropriate functions.
class _XT_EXT_CLASS CXTMemFile : public CMemFile
{
public:
// Input: nGrowBytes - The memory allocation increment in bytes.
// Summary: Constructs a CXTMemFile object. This overload opens an empty memory
// file. Note that the file is opened by the constructor and that you
// should not call CFile::Open.
CXTMemFile(UINT nGrowBytes = 1024 );
// Input: lpBuffer - Pointer to the buffer to be attached to CXTMemFile.
// nBufferSize - An integer that specifies the size of the buffer in bytes.
// nGrowBytes - The memory allocation increment in bytes.
// Summary: Constructs a CXTMemFile object. This overload acts the same as
// if you used the first constructor and immediately called Attach with
// the same parameters.
CXTMemFile(BYTE* lpBuffer,UINT nBufferSize,UINT nGrowBytes = 0);
// Input: lpstFilename - A string that is the path to the desired file. The path can be relative,
// absolute, or a network name (UNC).
// uiOpenFlags - A UINT that defines the file<6C>s sharing and access mode. It specifies
// the action to take when opening the file. You can combine options
// by using the bitwise-OR ( | ) operator. One access permission and
// one share option are required. The modeCreate and modeNoInherit modes
// are optional. See the CFile constructor for a list of mode options.
// Summary: Constructs a CXTMemFile object.
CXTMemFile(LPCTSTR lpstFilename,UINT uiOpenFlags);
// Summary: Destroys a CXTMemFile object, handles cleanup and de-allocation.
virtual ~CXTMemFile();
private:
UINT m_uiOpenFlags;
bool m_bOpen;
CFile m_File;
CFileException* m_pError;
public:
// Summary: This member function forces any data remaining in the file buffer
// to be written to the file. The use of Flush does not guarantee flushing
// of CArchive buffers. If you are using an archive, call CArchive::Flush
// first.
virtual void Flush();
#if _MFC_VER >= 0x0700 //MFC 7.0
using CMemFile::Open;
#endif
// Input: strFilename - Specifies a NULL terminated string that is the path to the desired file.
// uiOpenFlags - Specifies a UINT that defines the sharing and access mode in the file.
// It specifies the action to take when opening the file. You can combine
// options by using the bitwise-OR ( | ) operator. One access permission
// and one share option are required. The modeCreate and modeNoInherit
// modes are optional. See the CFile constructor for a list of mode options.
// pError - Specifies a pointer to an existing file-exception object that receives
// the status of a failed operation.
// Returns: true if successful, or false if it fails.
// Summary: This member function opens and loads a physical File into memory.
virtual bool Open(CString strFilename, UINT uiOpenFlags, CFileException* pError = NULL);
// Summary: This member function saves the contents of the memory to the disk
// and closes it.
virtual void Close();
// Input: rString - A CString reference to an object to receive the string that is read.
// Returns: TRUE if successful, or FALSE if there is an error.
// Summary: This member function reads a string.
virtual BOOL ReadString(CString& rString);
// Input: lpsz - Specifies a pointer to a buffer containing a null-terminated text
// string.
// Summary: This method writes data from a buffer to the file associated with
// the CArchive object. The terminating null character, \0, is not written
// to the file, nor is a newline character automatically written.
virtual void WriteString( LPCTSTR lpsz );
#if _MFC_VER >= 0x0700 //MFC 7.0
using CMemFile::Duplicate;
#endif //MFC 7.0
// Input: fDuplicate - A pointer to a valid CFile object.
// Returns: true if successful, otherwise returns false.
// Summary: This member function will initialize the CXTMemFile object with
// the information specified in the 'fDuplicate' object.
virtual bool Duplicate(CFile *fDuplicate);
// Input: strDup - A NULL terminated string.
// Returns: true if successful, otherwise returns false.
// Summary: This member function will initialize the CXTMemFile object with
// the information specified in the 'strDup' string object.
virtual bool Duplicate(CString strDup);
// Returns: true if successful, otherwise returns false.
// Summary: This member function discards all changes to file since Open() or
// last Flush().
virtual bool Discard();
// Input: fSrc - A pointer to a valid CFile object.
// dwSourcePos - Represents the source file position.
// dwDestPos - Represents the destination file position.
// dwBytes - Number of bytes to insert.
// Returns: A DWORD value that represents the length of the copied bytes.
// Summary: This member function inserts any File and returns the length of the actual
// copied bytes.
virtual DWORD Insert(CFile* fSrc, DWORD dwSourcePos, DWORD dwDestPos, DWORD dwBytes);
// Input: strSrc - Specifies a NULL terminated string that is the path to the desired
// file.
// dwSourcePos - Represents the source file position.
// dwDestPos - Represents the destination file position.
// dwBytes - Number of bytes to insert.
// Returns: A DWORD value that represents the length of the copied bytes.
// Summary: This member function inserts any File and returns the length of
// the actual copied bytes.
virtual DWORD Insert(CString strSrc, DWORD dwSourcePos, DWORD dwDestPos, DWORD dwBytes);
// Input: fDest - A pointer to a valid CFile object.
// dwStartPos - Represents the starting position.
// dwBytes - Number of bytes to extract.
// Returns: A DWORD value that represents the length of the copied bytes.
// Summary: This member function extracts bytes to a file and returns the length
// of the actual copied bytes.
virtual DWORD Extract(CFile *fDest,DWORD dwStartPos, DWORD dwBytes);
// Input: strDest - Specifies a NULL terminated string that is the path to the desired
// file.
// dwStartPos - Represents the starting position.
// dwBytes - Number of bytes to extract.
// Returns: A DWORD value that represents the length of the copied bytes.
// Summary: This member function extracts bytes to a file and returns the length
// of the actual copied bytes.
virtual DWORD Extract(CString strDest, DWORD dwStartPos, DWORD dwBytes);
// Input: pData - Pointer to the buffer to receive the data found.
// dwDataLen - Size of the data to find.
// lStartPos - Starting position.
// Returns: A LONG data type.
// Summary: This member function finds data in the file.
LONG FindData(void* pData, DWORD dwDataLen, LONG lStartPos);
// Input: fDup - A pointer to a valid CFile object.
// Summary: This member operator will initialize the CXTMemFile object with
// the object specified by 'fDup'.
void operator =(CFile* fDup);
// Input: strDup - Specifies a NULL terminated string that is the path to the desired
// file.
// Summary: This member operator will initialize the CXTMemFile object with
// the object specified by 'strDup'.
void operator =(CString strDup);
// Input: dwFilePos - DWORD value that specifies file position.
// Summary: This member operator will adjust the file position.
void operator =(DWORD dwFilePos);
// Input: fApp - A pointer to a valid CFile object.
// Summary: This member operator will append the CXTMemFile object with the object
// specified by 'fApp'.
void operator +=(CFile *fApp);
// Input: strApp - Specifies a NULL terminated string that is the path to the desired
// file.
// Summary: This member operator will append the CXTMemFile object with the object
// specified by 'strApp'.
void operator +=(CString strApp);
// Input: dwFilePos - DWORD value that specifies file position.
// Summary: This member operator will perform indexing operations for the CXTMemFile
// object. Returns a BYTE data type.
BYTE operator [](DWORD dwFilePos);
protected:
// Returns: true if successful, otherwise returns false.
// Summary: This member function loads the file into memory.
virtual bool Load();
// Returns: true if successful, otherwise returns false.
// Summary: This member function saves the file to disk.
virtual bool Save();
// Input: fImp - A pointer to a valid CFile object.
// Returns: true if successful, otherwise returns false.
// Summary: This member function imports the data of a CFile derived object
// (operator = ).
virtual bool Import(CFile *fImp);
// Input: fApp - A pointer to a valid CFile object.
// Returns: true if successful, otherwise returns false.
// Summary: This member function appends a CFile derived object to the file
// (operator += ).
virtual bool Append(CFile* fApp);
};
//////////////////////////////////////////////////////////////////////
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // #if !defined(__XTMEMFILE_H__)