/*
Copyright (C) 1999-2007 id Software, Inc. and contributors.
For a list of contributors, see the accompanying CONTRIBUTORS file.

This file is part of GtkRadiant.

GtkRadiant is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

GtkRadiant is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef _IFILESYSTEM_H_
#define _IFILESYSTEM_H_

//
// Plugin interface for the virtual filesystem used by Radiant
//

// NOTE: If you want to write a VFS plugin then you must export
// "QERPlug_ListInterfaces" and "QERPlug_RequestInterface"
// (see qerplugin.h for more information)

#ifdef _WIN32
#define VFS_NATIVESEPARATOR '\\'
#else
#define VFS_NATIVESEPARATOR '/'
#endif

#define VFS_MAJOR "VFS"

// return the file system supported by the plugin, for example: "quake1" or "quake3"
//typedef const char* (WINAPI* PFN_VFSGETFORMAT) ();
// add all files from a directory to the vfs
typedef void (* PFN_VFSINITDIRECTORY) (const char *path);
// free all resources used by the plugin
typedef void (* PFN_VFSSHUTDOWN) ();
// free memory allocated by VFS for this pointer
typedef void (* PFN_VFSFREEFILE) (void *p);
// return a GSList with all the directories under basedir 
typedef GSList* (* PFN_VFSGETDIRLIST) (const char *basedir);
// return a GSList with all the files under basedir (extension can be NULL)
typedef GSList* (* PFN_VFSGETFILELIST) (const char *basedir, const char *extension);
// free a dirlist or filelist returned from one of the above functions
typedef void (* PFN_VFSCLEARFILEDIRLIST) (GSList **lst);
#define VFS_SEARCH_PAK 0x1
#define VFS_SEARCH_DIR 0x2
/*!
\brief return the number of files with the exact name described in filename
there can be several hits for a given file, or this can be used to check for existence
\param flags is optional and can be used with VFS_SEARCH_* bits, if flag is 0, everything is searched, else only the specified bits
paks are searched first, then search directories
*/
typedef int (* PFN_VFSGETFILECOUNT) (const char *filename, int flags);
/*!
\brief load file, allocate buffer
\return -1 if fails or the size of the buffer allocated
\param index is used to load the i-th file in the search directories (see vfsGetFileCount)
this will scan in the search directories first, then it will search in the pak files
WARNING: the allocated buffer must be freed with a g_free call
NOTE TTimo: the g_free release is utter horror
 see http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=491
*/
typedef int (* PFN_VFSLOADFILE) (const char *filename, void **buffer, int index);
// load a file from it's full path into the buffer, returns the file size or -1
// the allocated buffer must be freed with a g_free call
typedef int (* PFN_VFSLOADFULLPATHFILE) (const char *filename, void **buffer);
// takes an absolute file path, returns a shortened relative file path if the absolute path matches a valid basedir or NULL if an error occured
typedef char* (* PFN_VFSEXTRACTRELATIVEPATH) (const char *in);
/*!
\return the full path (in a static buff) to a file given it's relative path (NULL if not found)
\param index if several files are matching (as returned in a call to vfsGetFileCount), get the index-th file
\param flag 0 or a combination of VFS_SEARCH_PAK or VFS_SEARCH_DIR
HYDRA:
  this now searches VFS/PAK files in addition to the filesystem
  if FLAG is 0 then ONLY dirs are searched.
  PAK's are searched before DIRs to mimic engine behaviour
  index is ignored when searching PAK files.
  when searching VFS, files are searched case insensitive.

WARNING: if you use index from vfsGetFileCount, it works only with a vfsGetFileCount for the search directories only (not the pak files)
FIXME TTimo our VFS names are case insensitive.
   this function is not able to build the full path from case-insensitive name
   ( this is http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=130 )
*/
typedef char* (* PFN_VFSGETFULLPATH) (const char *in, int index, int flag);
/*!
these return a static char*, doesn't need to be freed or anything
get the base path to use when raising file dialogs
we manually add "maps/" or "sounds/" or "mapobjects/models/" etc.
FIXME: I'm not sure this is used / relevant anymore
*/
typedef const char* (* PFN_VFSBASEPROMPTPATH) ();

// VFS API
struct _QERFileSystemTable
{
  int m_nSize;
  PFN_VFSINITDIRECTORY        m_pfnInitDirectory;
  PFN_VFSSHUTDOWN             m_pfnShutdown;
  PFN_VFSFREEFILE             m_pfnFreeFile;
  PFN_VFSGETDIRLIST           m_pfnGetDirList;
  PFN_VFSGETFILELIST          m_pfnGetFileList;
  PFN_VFSCLEARFILEDIRLIST     m_pfnClearFileDirList;
  PFN_VFSGETFILECOUNT         m_pfnGetFileCount;
  PFN_VFSLOADFILE             m_pfnLoadFile;
  PFN_VFSLOADFULLPATHFILE     m_pfnLoadFullPathFile;
  PFN_VFSEXTRACTRELATIVEPATH  m_pfnExtractRelativePath;
  PFN_VFSGETFULLPATH          m_pfnGetFullPath;
  PFN_VFSBASEPROMPTPATH       m_pfnBasePromptPath;
};

#ifdef USE_VFSTABLE_DEFINE
#ifndef __VFSTABLENAME
#define __VFSTABLENAME g_FileSystemTable
#endif
#define vfsInitDirectory __VFSTABLENAME.m_pfnInitDirectory
#define vfsShutdown __VFSTABLENAME.m_pfnShutdown
#define vfsFreeFile __VFSTABLENAME.m_pfnFreeFile
#define vfsGetDirList __VFSTABLENAME.m_pfnGetDirList
#define vfsGetFileList __VFSTABLENAME.m_pfnGetFileList
#define vfsClearFileDirList __VFSTABLENAME.m_pfnClearFileDirList
#define vfsGetFileCount __VFSTABLENAME.m_pfnGetFileCount
#define vfsLoadFile __VFSTABLENAME.m_pfnLoadFile
#define vfsLoadFullPathFile __VFSTABLENAME.m_pfnLoadFullPathFile
#define vfsExtractRelativePath __VFSTABLENAME.m_pfnExtractRelativePath
#define vfsGetFullPath __VFSTABLENAME.m_pfnGetFullPath
#define vfsBasePromptPath __VFSTABLENAME.m_pfnBasePromptPath
#endif

#endif // _IFILESYSTEM_H_