Xash3D FWGS engine.
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/*
VFileSystem009.h - C++ interface for filesystem_stdio
Copyright (C) 2022-2023 Xash3D FWGS contributors
This program 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 3 of the License, or
(at your option) any later version.
This program 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.
*/
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <stdarg.h>
#include ALLOCA_H
#include "crtlib.h"
#include "filesystem.h"
#include "filesystem_internal.h"
#include "VFileSystem009.h"
#include "common/com_strings.h"
#if __cplusplus < 201103L
#define override
#define nullptr NULL
#endif
// GoldSrc Directories and ID
// GAME gamedir
// GAMECONFIG gamedir (rodir integration?)
// GAMEDOWNLOAD gamedir_downloads (gamedir/downloads for us)
// GAME_FALLBACK liblist.gam's fallback_dir
// ROOT and BASE rootdir
// PLATFORM platform
// CONFIG platform/config
// This is a macro because pointers returned by alloca
// shouldn't leave current scope
#define FixupPath( var, str ) \
const size_t var ## _size = Q_strlen(( str )) + 1; \
char * const var = static_cast<char *>( alloca( var ## _size )); \
CopyAndFixSlashes( var, ( str ), var ## _size )
static inline bool IsIdGamedir( const char *id )
{
return !Q_strcmp( id, "GAME" ) ||
!Q_strcmp( id, "GAMECONFIG" ) ||
!Q_strcmp( id, "GAMEDOWNLOAD" );
}
static inline const char *IdToDir( char *dir, size_t size, const char *id )
{
if( !Q_strcmp( id, "GAME" ))
return GI->gamefolder;
if( !Q_strcmp( id, "GAMEDOWNLOAD" ))
{
Q_snprintf( dir, size, "%s/downloaded", GI->gamefolder );
return dir;
}
if( !Q_strcmp( id, "GAMECONFIG" ))
return fs_writepath->filename; // full path here so it's totally our write allowed directory
if( !Q_strcmp( id, "PLATFORM" ))
return "platform"; // stub
if( !Q_strcmp( id, "CONFIG" ))
return "platform/config"; // stub
// ROOT || BASE
return fs_rootdir; // give at least root directory
}
static inline void CopyAndFixSlashes( char *p, const char *in, size_t size )
{
Q_strncpy( p, in, size );
COM_FixSlashes( p );
}
class CXashFS : public IVFileSystem009
{
private:
class CSearchState
{
public:
CSearchState( CSearchState **head, search_t *search ) :
next( *head ),
search( search ),
index( 0 ),
handle( *head ? ( *head )->handle + 1 : 0 )
{
*head = this;
}
~CSearchState()
{
Mem_Free( search );
}
CSearchState *next;
search_t *search;
int index;
FileFindHandle_t handle;
};
CSearchState *searchHead;
CSearchState *GetSearchStateByHandle( FileFindHandle_t handle )
{
for( CSearchState *state = searchHead; state; state = state->next )
{
if( state->handle == handle )
return state;
}
Con_DPrintf( "Can't find search state by handle %d\n", handle );
return nullptr;
}
public:
CXashFS() : searchHead( nullptr )
{
}
void RemoveAllSearchPaths() override
{
FS_ClearSearchPath();
}
void AddSearchPath( const char *path, const char *id ) override
{
FixupPath( p, path );
FS_AddGameDirectory( p, FS_CUSTOM_PATH );
}
void AddSearchPathNoWrite( const char *path, const char *id ) override
{
FixupPath( p, path );
FS_AddGameDirectory( p, FS_NOWRITE_PATH | FS_CUSTOM_PATH );
}
bool RemoveSearchPath( const char *id ) override
{
// TODO:
return true;
}
void RemoveFile( const char *path, const char *id ) override
{
char dir[MAX_VA_STRING], fullpath[MAX_VA_STRING];
Q_snprintf( fullpath, sizeof( fullpath ), "%s/%s", IdToDir( dir, sizeof( dir ), id ), path );
FS_Delete( fullpath ); // FS_Delete is aware of slashes
}
void CreateDirHierarchy( const char *path, const char *id ) override
{
char dir[MAX_VA_STRING], fullpath[MAX_VA_STRING];
Q_snprintf( fullpath, sizeof( fullpath ), "%s/%s", IdToDir( dir, sizeof( dir ), id ), path );
FS_CreatePath( fullpath ); // FS_CreatePath is aware of slashes
}
bool FileExists( const char *path ) override
{
FixupPath( p, path );
return FS_FileExists( p, false );
}
bool IsDirectory( const char *path ) override
{
FixupPath( p, path );
return FS_SysFolderExists( p );
}
FileHandle_t Open( const char *path, const char *mode, const char *id ) override
{
file_t *fd;
FixupPath( p, path );
fd = FS_Open( p, mode, IsIdGamedir( id ));
return fd;
}
void Close( FileHandle_t handle ) override
{
FS_Close( static_cast<file_t *>( handle ));
}
void Seek( FileHandle_t handle, int offset, FileSystemSeek_t whence ) override
{
int whence_ = SEEK_SET;
switch( whence )
{
case FILESYSTEM_SEEK_HEAD:
whence_ = SEEK_SET;
break;
case FILESYSTEM_SEEK_CURRENT:
whence_ = SEEK_CUR;
break;
case FILESYSTEM_SEEK_TAIL:
whence_ = SEEK_END;
break;
}
FS_Seek( static_cast<file_t *>( handle ), offset, whence_ );
}
unsigned int Tell( FileHandle_t handle ) override
{
return FS_Tell( static_cast<file_t *>( handle ));
}
unsigned int Size( FileHandle_t handle ) override
{
return static_cast<file_t *>( handle )->real_length;
}
unsigned int Size( const char *path ) override
{
FixupPath( p, path );
return FS_FileSize( p, false );
}
long int GetFileTime( const char *path ) override
{
FixupPath( p, path );
return FS_FileTime( p, false );
}
void FileTimeToString( char *p, int size, long int time ) override
{
const time_t curtime = time;
char *buf = ctime( &curtime );
Q_strncpy( p, buf, size );
}
bool IsOk( FileHandle_t handle ) override
{
return !FS_Eof( static_cast<file_t *>( handle ));
}
void Flush( FileHandle_t handle ) override
{
FS_Flush( static_cast<file_t *>( handle ));
}
bool EndOfFile( FileHandle_t handle ) override
{
return FS_Eof( static_cast<file_t *>( handle ));
}
int Read( void *buf, int size, FileHandle_t handle ) override
{
return FS_Read( static_cast<file_t *>( handle ), buf, size );
}
int Write( const void *buf, int size, FileHandle_t handle ) override
{
return FS_Write( static_cast<file_t *>( handle ), buf, size );
}
char *ReadLine( char *buf, int size, FileHandle_t handle ) override
{
const int c = FS_Gets( static_cast<file_t *>( handle ), buf, size );
return c >= 0 ? buf : nullptr;
}
int FPrintf( FileHandle_t handle, char *fmt, ... ) override
{
va_list ap;
int ret;
va_start( ap, fmt );
ret = FS_VPrintf( static_cast<file_t *>( handle ), fmt, ap );
va_end( ap );
return ret;
}
void *GetReadBuffer( FileHandle_t, int *size, bool ) override
{
// deprecated by Valve
*size = 0;
return nullptr;
}
void ReleaseReadBuffer( FileHandle_t, void * ) override
{
// deprecated by Valve
return;
}
const char *FindFirst( const char *pattern, FileFindHandle_t *handle, const char *id ) override
{
CSearchState *state;
search_t *search;
if( !handle || !pattern )
return nullptr;
FixupPath( p, pattern );
search = FS_Search( p, true, IsIdGamedir( id ));
if( !search )
return nullptr;
state = new CSearchState( &searchHead, search );
*handle = state->handle;
return state->search->filenames[0];
}
const char *FindNext( FileFindHandle_t handle ) override
{
CSearchState *state = GetSearchStateByHandle( handle );
if( !state )
return nullptr;
if( state->index + 1 >= state->search->numfilenames )
return nullptr;
return state->search->filenames[++state->index];
}
bool FindIsDirectory( FileFindHandle_t handle ) override
{
CSearchState *state = GetSearchStateByHandle( handle );
if( !state )
return false;
if( state->index >= state->search->numfilenames )
return false;
return IsDirectory( state->search->filenames[state->index] );
}
void FindClose( FileFindHandle_t handle ) override
{
CSearchState *prev;
CSearchState *i;
for( prev = nullptr, i = searchHead;
i != nullptr && i->handle != handle;
prev = i, i = i->next );
if( i == nullptr )
{
Con_DPrintf( "FindClose: Can't find search state by handle %d\n", handle );
return;
}
if( prev != nullptr )
prev->next = i->next;
else
searchHead = i->next;
delete i;
}
const char *GetLocalPath( const char *name, char *buf, int size ) override
{
const char *fullpath;
if( !name )
return nullptr;
FixupPath( p, name );
#if !XASH_WIN32
if( p[0] == '/' )
#else
if( Q_strchr( p, ':' ))
#endif
{
Q_strncpy( buf, p, size );
return buf;
}
fullpath = FS_GetDiskPath( p, false );
if( !fullpath )
return nullptr;
Q_strncpy( buf, fullpath, size );
return buf;
}
char *ParseFile( char *buf, char *token, bool *quoted ) override
{
qboolean qquoted;
char *p;
p = COM_ParseFileSafe( buf, token, PFILE_FS_TOKEN_MAX_LENGTH, 0, nullptr, &qquoted );
if( quoted )
*quoted = qquoted;
return p;
}
bool FullPathToRelativePath( const char *path, char *out ) override
{
if( !COM_CheckString( path ))
{
*out = 0;
return false;
}
FixupPath( p, path );
return FS_FullPathToRelativePath( out, p, 512 );
}
bool GetCurrentDirectory( char *p, int size ) override
{
Q_strncpy( p, fs_rootdir, size );
return true;
}
void PrintOpenedFiles() override
{
// we don't track this yet
return;
}
void SetWarningFunc( void (*)( const char *, ... )) override
{
// TODO:
return;
}
void SetWarningLevel( FileWarningLevel_t ) override
{
// TODO:
return;
}
int SetVBuf( FileHandle_t handle, char *buf, int mode, long int size ) override
{
// TODO:
return 0;
}
void GetInterfaceVersion( char *p, int size ) override
{
Q_strncpy( p, "Stdio", size );
}
bool AddPackFile( const char *path, const char *id ) override
{
char dir[MAX_VA_STRING], fullpath[MAX_VA_STRING];
const char *ext = COM_FileExtension( path );
IdToDir( dir, sizeof( dir ), id );
Q_snprintf( fullpath, sizeof( fullpath ), "%s/%s", dir, path );
COM_FixSlashes( fullpath );
for( const fs_archive_t *archive = g_archives; archive->ext; archive++ )
{
if( archive->type == SEARCHPATH_PAK && !Q_stricmp( ext, archive->ext ))
return FS_AddArchive_Fullpath( archive, fullpath, FS_CUSTOM_PATH );
}
return false;
}
FileHandle_t OpenFromCacheForRead( const char *path , const char *mode, const char *id ) override
{
FixupPath( p, path );
return FS_OpenReadFile( p, mode, IsIdGamedir( id ));
}
// stubs
void Mount() override {}
void Unmount() override {}
void GetLocalCopy( const char * ) override {}
void LogLevelLoadStarted( const char * ) override {}
void LogLevelLoadFinished( const char * ) override {}
void CancelWaitForResources( WaitForResourcesHandle_t ) override {}
int HintResourceNeed( const char *, int ) override { return 0; }
WaitForResourcesHandle_t WaitForResources( const char * ) override { return 0; }
int PauseResourcePreloading() override { return 0; }
int ResumeResourcePreloading() override { return 0; }
bool IsAppReadyForOfflinePlay( int ) override { return true; }
bool IsFileImmediatelyAvailable( const char * ) override { return true; }
bool GetWaitForResourcesProgress( WaitForResourcesHandle_t, float *pProgress, bool *pOverride ) override
{
if( pProgress )
*pProgress = 0;
if( pOverride )
*pOverride = true;
return false;
}
} g_VFileSystem009;
extern "C" void EXPORT *CreateInterface( const char *interface, int *retval )
{
if( !Q_strcmp( interface, FILESYSTEM_INTERFACE_VERSION ))
{
if( retval )
*retval = 0;
return &g_VFileSystem009;
}
if( !Q_strcmp( interface, FS_API_CREATEINTERFACE_TAG ))
{
static fs_api_t copy = { 0 }; // return a copy, to disallow overriding
memcpy( &copy, &g_api, sizeof( copy ));
if( retval )
*retval = 0;
return &copy;
}
if( retval )
*retval = 1;
return nullptr;
}