Create cpl_vsi.h

/******************************************************************************
 * $Id: cpl_vsi.h,v 1.31 2006/03/27 15:24:41 fwarmerdam Exp $
 *
 * Project:  CPL - Common Portability Library
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 * Purpose:  Include file defining Virtual File System (VSI) functions, a
 *           layer over POSIX file and other system services. 
 *
 ******************************************************************************
 * Copyright (c) 1998, Frank Warmerdam
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ******************************************************************************
 * 
 * $Log: cpl_vsi.h,v $
 * Revision 1.31  2006/03/27 15:24:41  fwarmerdam
 * buffer in FWrite is const
 *
 * Revision 1.30  2006/03/21 20:11:54  fwarmerdam
 * fixup headers a bit
 *
 * Revision 1.29  2006/02/19 21:54:34  mloskot
 * [WINCE] Changes related to Windows CE port of CPL. Most changes are #ifdef wrappers.
 *
 * Revision 1.28  2006/01/10 17:03:56  fwarmerdam
 * added VSI Rename support
 *
 * Revision 1.27  2005/10/07 00:26:27  fwarmerdam
 * add documentation
 *
 * Revision 1.26  2005/10/03 18:56:40  fwarmerdam
 * always define large file api - cygwin fix
 *
 * Revision 1.25  2005/09/15 18:32:35  fwarmerdam
 * added VSICleanupFileManager
 *
 * Revision 1.24  2005/09/12 16:53:33  fwarmerdam
 * fixed VSIGetMemFileBuffer declaration
 *
 * Revision 1.23  2005/09/12 16:50:37  fwarmerdam
 * added VSIMemFile buffer fetcher
 *
 * Revision 1.22  2005/09/11 18:31:41  fwarmerdam
 * ensure a distinct VSIStatL() exists on win32
 *
 * Revision 1.21  2005/09/11 18:01:28  fwarmerdam
 * preliminary implementatin of fully virtualized large file api
 *
 * Revision 1.20  2005/04/12 03:51:11  fwarmerdam
 * Fixed stat64 problem.
 *
 * Revision 1.19  2005/04/12 00:27:39  fwarmerdam
 * added macos large file support
 *
 * Revision 1.18  2003/09/10 19:44:36  warmerda
 * added VSIStrerrno()
 *
 * Revision 1.17  2003/09/08 08:11:40  dron
 * Added VSIGMTime() and VSILocalTime().
 *
 * Revision 1.16  2003/05/27 20:44:40  warmerda
 * added VSI io debugging macros
 */