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File indexing completed on 2025-01-18 10:04:36

 // Created on: 1992-02-17
 // Created by: Stephan GARNAUD
 // Copyright (c) 1992-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _OSD_File_HeaderFile
 #define _OSD_File_HeaderFile
 
 #include <OSD_FileNode.hxx>
 #include <OSD_FromWhere.hxx>
 #include <OSD_KindFile.hxx>
 #include <OSD_LockType.hxx>
 #include <OSD_OpenMode.hxx>
 
 class OSD_Path;
 class OSD_Protection;
 
 //! Basic tools to manage files
 //! Warning: 'ProgramError' is raised when somebody wants to use the methods
 //! Read, Write, Seek, Close when File is not open.
 class OSD_File  : public OSD_FileNode
 {
 public:
 
   //! Creates File object.
   Standard_EXPORT OSD_File();
   
   //! Instantiates the object file, storing its name
   Standard_EXPORT OSD_File(const OSD_Path& Name);
 
   //! Unlocks and closes a file, deletes a descriptor and destructs a file object.
   Standard_EXPORT ~OSD_File();
   
   //! CREATES a file if it doesn't already exists or empties
   //! an existing file.
   //! After 'Build', the file is open.
   //! If no name was given, ProgramError is raised.
   Standard_EXPORT void Build (const OSD_OpenMode Mode, const OSD_Protection& Protect);
   
   //! Opens a File with specific attributes
   //! This works only on already existing file.
   //! If no name was given, ProgramError is raised.
   Standard_EXPORT void Open (const OSD_OpenMode Mode, const OSD_Protection& Protect);
   
   //! Appends data to an existing file.
   //! If file doesn't exist, creates it first.
   //! After 'Append', the file is open.
   //! If no name was given, ProgramError is raised.
   Standard_EXPORT void Append (const OSD_OpenMode Mode, const OSD_Protection& Protect);
   
   //! Attempts to read Nbyte bytes from the file associated with
   //! the object file.
   //! Upon successful completion, Read returns the number of
   //! bytes actually read and placed in the Buffer. This number
   //! may be less than Nbyte if the number of bytes left in the file
   //! is less than Nbyte bytes. In this case only number of read
   //! bytes will be placed in the buffer.
   Standard_EXPORT void Read (TCollection_AsciiString& Buffer, const Standard_Integer Nbyte);
   
   //! Reads bytes from the data pointed to by the object file
   //! into the buffer <Buffer>.
   //! Data is read until <NByte-1> bytes have been read,
   //! until a newline character is read and transferred into
   //! <Buffer>, or until an EOF (End-of-File) condition is
   //! encountered.
   //! Upon successful completion, Read returns the number of
   //! bytes actually read into <NByteRead> and placed into the
   //! Buffer <Buffer>.
   Standard_EXPORT void ReadLine (TCollection_AsciiString& Buffer, const Standard_Integer NByte, Standard_Integer& NbyteRead);
 
   //! Reads bytes from the data pointed to by the object file
   //! into the buffer <Buffer>.
   //! Data is read until <NByte-1> bytes have been read,
   //! until a newline character is read and transferred into
   //! <Buffer>, or until an EOF (End-of-File) condition is
   //! encountered.
   //! Upon successful completion, Read returns the number of
   //! bytes actually read and placed into the Buffer <Buffer>.
   inline Standard_Integer ReadLine (
     TCollection_AsciiString& Buffer, const Standard_Integer NByte) 
   {
     Standard_Integer NbyteRead;
     ReadLine(Buffer, NByte, NbyteRead);
     return NbyteRead;
   }
 
   
   //! Attempts to read Nbyte bytes from the files associated with
   //! the object File.
   //! Upon successful completion, Read returns the number of
   //! bytes actually read and placed in the Buffer. This number
   //! may be less than Nbyte if the number of bytes left in the file
   //! is less than Nbyte bytes. For this reason the output
   //! parameter Readbyte will contain the number of read bytes.
   Standard_EXPORT void Read (const Standard_Address Buffer, const Standard_Integer Nbyte, Standard_Integer& Readbyte);
 
   //! Attempts to write theNbBytes bytes from the AsciiString to the file.
   void Write (const TCollection_AsciiString& theBuffer, const Standard_Integer theNbBytes)
   {
     Write ((Standard_Address )theBuffer.ToCString(), theNbBytes);
   }
 
   //! Attempts to write theNbBytes bytes from the buffer pointed
   //! to by theBuffer to the file associated to the object File.
   Standard_EXPORT void Write (const Standard_Address theBuffer, const Standard_Integer theNbBytes);
   
   //! Sets the seek pointer associated with the open file
   Standard_EXPORT void Seek (const Standard_Integer Offset, const OSD_FromWhere Whence);
   
   //! Closes the file (and deletes a descriptor)
   Standard_EXPORT void Close();
   
   //! Returns TRUE if the seek pointer is at end of file.
   Standard_EXPORT Standard_Boolean IsAtEnd();
   
   //! Returns the kind of file. A file can be a
   //! file, a directory or a link.
   Standard_EXPORT OSD_KindFile KindOfFile() const;
   
   //! Makes a temporary File
   //! This temporary file is already open !
   Standard_EXPORT void BuildTemporary();
   
   //! Locks current file
   Standard_EXPORT void SetLock (const OSD_LockType Lock);
   
   //! Unlocks current file
   Standard_EXPORT void UnLock();
   
   //! Returns the current lock state
   OSD_LockType GetLock() const { return myLock; }
 
   //! Returns TRUE if this file is locked.
   Standard_Boolean IsLocked() const
   {
   #ifdef _WIN32
     return ImperativeFlag;
   #else
     return myLock != OSD_NoLock;
   #endif
   }
   
   //! Returns actual number of bytes of <me>.
   Standard_EXPORT Standard_Size Size();
 
   //! Returns TRUE if <me> is open.
   Standard_EXPORT Standard_Boolean IsOpen() const;
   
   //! returns TRUE if the file exists and if the user
   //! has the authorization to read it.
   Standard_EXPORT Standard_Boolean IsReadable();
   
   //! returns TRUE if the file can be read and overwritten.
   Standard_EXPORT Standard_Boolean IsWriteable();
   
   //! returns TRUE if the file can be executed.
   Standard_EXPORT Standard_Boolean IsExecutable();
   
   //! Enables to emulate unix "tail -f" command.
   //! If a line is available in the file <me> returns it.
   //! Otherwise attempts to read again aNbTries times in the file
   //! waiting aDelay seconds between each read.
   //! If meanwhile the file increases returns the next line, otherwise
   //! returns FALSE.
   Standard_EXPORT Standard_Boolean ReadLastLine (TCollection_AsciiString& aLine, const Standard_Integer aDelay, const Standard_Integer aNbTries);
   
   //! find an editor on the system and edit the given file
   Standard_EXPORT Standard_Boolean Edit();
 
   //! Set file pointer position to the beginning of the file
   Standard_EXPORT void Rewind();
 
 protected:
 
 #ifdef _WIN32
   Standard_Address myFileHandle;
 #else
   Standard_Integer myFileChannel;
   Standard_Address myFILE;
 #endif
   Standard_Integer myIO;
 
 private:
 
   OSD_LockType myLock;
   OSD_OpenMode myMode;
   Standard_Boolean ImperativeFlag;
 
 };
 
 #endif // _OSD_File_HeaderFile

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