C++ FS_FOpenFile函数代码示例

static void WriteCache( void ) {
    char buffer[MAX_OSPATH];
    qhandle_t f;
    int i;
    char *map, *pov;
    demoEntry_t *e;
    size_t len;

    if( m_demos.list.numItems == m_demos.numDirs ) {
        return;
    }

    len = Q_concat( buffer, sizeof( buffer ), m_demos.browse, "/" COM_DEMOCACHE_NAME, NULL );
    if( len >= sizeof( buffer ) ) {
        return;
    }
    FS_FOpenFile( buffer, &f, FS_MODE_WRITE );
    if( !f ) {
        return;
    }

    for( i = 0; i < 16; i++ ) {
        FS_FPrintf( f, "%02x", m_demos.hash[i] );
    }
    FS_FPrintf( f, "\\" );

    for( i = m_demos.numDirs; i < m_demos.list.numItems; i++ ) {
        e = m_demos.list.items[i];
        map = UI_GetColumn( e->name, COL_MAP );
        pov = UI_GetColumn( e->name, COL_POV );
        FS_FPrintf( f, "%s\\%s\\", map, pov );
    }
    FS_FCloseFile( f );
}

/*
static qboolean SV_RunGameFrame( int msec )
{
int extraTime = 0;
static unsigned int accTime = 0;

accTime += msec;

// move autonomous things around if enough time has passed
if( svs.gametime < sv.nextSnapTime )
{
if( svs.gametime + svc.snapFrameTime < sv.nextSnapTime )
{
if( sv_showclamp->integer )
Com_Printf( "sv lowclamp\n" );
sv.nextSnapTime = svs.gametime + svc.snapFrameTime;
return qfalse;
}

// see if it's time to advance the world
if( accTime >= WORLDFRAMETIME )
{
if( host_speeds->integer )
time_before_game = Sys_Milliseconds();

ge->RunFrame( WORLDFRAMETIME, svs.gametime );

if( host_speeds->integer )
time_after_game = Sys_Milliseconds();

accTime = accTime - WORLDFRAMETIME;
}

if( !SV_SendClientsFragments() )
{
// FIXME: gametime might slower/faster than real time
if( dedicated->integer )
{
socket_t *sockets[] = { &svs.socket_udp, NULL };
NET_Sleep( min( WORLDFRAMETIME - accTime, sv.nextSnapTime - svs.gametime ), sockets );
}
}

return qfalse;
}

if( sv.nextSnapTime <= svs.gametime )
{
extraTime = (int)( svs.gametime - sv.nextSnapTime );
}
if( extraTime >= msec )
extraTime = msec - 1;

sv.nextSnapTime = ( svs.gametime + svc.snapFrameTime ) - extraTime;

// Execute all clients pending move commands
if( accTime )
{
ge->RunFrame( accTime, svs.gametime );
accTime = 0;
}

// update ping based on the last known frame from all clients
SV_CalcPings();

sv.framenum++;
ge->SnapFrame();

return qtrue;
}
*/
static void SV_CheckDefaultMap( void )
{
	if( svc.autostarted )
		return;

	svc.autostarted = qtrue;
	if( dedicated->integer )
	{
		if( sv.state == ss_dead && !strlen( sv.mapname ) )
        {
            int filehandle;
            if( sv_write_defaultmap && sv_write_defaultmap->integer && FS_FOpenFile( "defaultmap", &filehandle, FS_READ ) != -1 )
            {
                static char buffer[MAX_QPATH];
                buffer[0] = '\0';
                FS_Read( buffer, MAX_QPATH - 1, filehandle );
                FS_FCloseFile( filehandle );
                if( buffer[0] )
                {
                    Cbuf_ExecuteText( EXEC_APPEND, va( "map %s\n", buffer ) );
                    return;
                }
            }
            if( sv_defaultmap && strlen( sv_defaultmap->string ) )
                Cbuf_ExecuteText( EXEC_APPEND, va( "map %s\n", sv_defaultmap->string ) );
        }
	}
}

// returns static string of md5 contents
const char *MM_PasswordRead( const char *user )
{
	static char buffer[MAX_STRING_CHARS];
	const char *filename;
	int filenum;
	size_t bytes;

	Com_DPrintf( "MM_PasswordRead %s\n", user );

	filename = mm_passwordFilename( user );
	if( FS_FOpenFile( filename, &filenum, FS_READ ) == -1 )
	{
		Com_Printf( "MM_PasswordRead: Couldnt open file %s\n", filename);
		return NULL;
	}

	bytes = FS_Read(buffer, sizeof( buffer ) - 1,  filenum );
	FS_FCloseFile( filenum );

	if( bytes == 0 || bytes >= sizeof(buffer) - 1 )
		return NULL;

	buffer[bytes] = '\0';

	return buffer;
}

/*
* CL_CheckOrDownloadFile
* 
* Returns true if the file exists or couldn't send download request
* Files with .pk3 or .pak extension have to have gamedir attached
* Other files must not have gamedir
*/
qboolean CL_CheckOrDownloadFile( const char *filename )
{
	const char *ext;

	if( !cl_downloads->integer )
		return qtrue;

	if( !COM_ValidateRelativeFilename( filename ) )
		return qtrue;

	ext = COM_FileExtension( filename );
	if( !ext || !*ext )
		return qtrue;

	if( FS_CheckPakExtension( filename ) )
	{
		if( FS_FOpenBaseFile( filename, NULL, FS_READ ) != -1 )
			return qtrue;
	}
	else
	{
		if( FS_FOpenFile( filename, NULL, FS_READ ) != -1 )
			return qtrue;
	}

	if( !CL_DownloadRequest( filename, qtrue ) )
		return qtrue;

	cls.download.requestnext = qtrue; // call CL_RequestNextDownload when done

	return qfalse;
}

static size_t wswcurl_write(void *ptr, size_t size, size_t nmemb, void *stream)
{
    wswcurl_req *req = (wswcurl_req*)stream;
    if (!req->filename) {
        // Reallocate buffer
        req->rxdata = WREALLOC(req->rxdata, req->rxsize + (size * nmemb) + 1);
        // Set remaining data to 0
        memset(&(req->rxdata[req->rxsize]), 0, (size * nmemb));
        // Copy received data
        memcpy(&(req->rxdata[req->rxsize]), ptr, size*nmemb);
        // Recalculate size
        req->rxsize += size*nmemb;
        // Add trailing NULL byte at the end to prevent string overflow
        req->rxdata[req->rxsize] = '\0';
    } else {
        // Receive to the filename.
        // TODO: FILE RESUMING??
#ifndef WSWCURL_TEST_MAIN
        if ( (req->filenum < 0) && ( FS_FOpenFile( req->filename, &(req->filenum), FS_WRITE ) < 0 ) ) {
            return 0; // RETURN ERROR
        }
        FS_Write(ptr, size * nmemb, req->filenum);
#else
        // TODO: IMPLEMENT TEST
#endif
    }
    // Mark connection as having had activity.
    req->activity = 1;
    if (req->callback_progress) {
        // Execute progress callback
        // ??? What to return when expected size is unknown? - currently, return 0.0
        req->callback_progress(req, ( req->rx_expsize < 0 ) ? 0.0 : (req->rxsize / req->rx_expsize) * 100.0);
    }
    return size*nmemb;
}

/*
 * Filename are reletive to the quake search path. A null buffer will just
 * return the file length without loading.
 */
int
FS_LoadFile(char *path, void **buffer)
{
	byte *buf; /* Buffer. */
	int size; /* File size. */
	fileHandle_t f; /* File handle. */

	buf = NULL;
	size = FS_FOpenFile(path, &f, FS_READ);

	if (size <= 0)
	{
		if (buffer)
		{
			*buffer = NULL;
		}

		return size;
	}

	if (buffer == NULL)
	{
		FS_FCloseFile(f);
		return size;
	}

	buf = Z_Malloc(size);
	*buffer = buf;

	FS_Read(buf, size, f);
	FS_FCloseFile(f);

	return size;
}

void
SV_ReadLevelFile(void)
{
	char name[MAX_OSPATH];
	fileHandle_t f;

	Com_DPrintf("SV_ReadLevelFile()\n");

	Com_sprintf(name, sizeof(name), "save/current/%s.sv2", sv.name);
	FS_FOpenFile(name, &f, FS_READ);

	if (!f)
	{
		Com_Printf("Failed to open %s\n", name);
		return;
	}

	FS_Read(sv.configstrings, sizeof(sv.configstrings), f);
	CM_ReadPortalState(f);
	FS_FCloseFile(f);

	Com_sprintf(name, sizeof(name), "%s/save/current/%s.sav",
				FS_Gamedir(), sv.name);
	ge->ReadLevel(name);
}

/*
============
FS_LoadFile

Filename are reletive to the quake search path
a null buffer will just return the file length without loading
============
*/
int FS_LoadFile(char *path, void **buffer)
{
	FILE	*h;
	byte	*buf;
	int		len;

	buf = NULL;	// quiet compiler warning

	// look for it in the filesystem or pack files
	len = FS_FOpenFile(path, &h);
	if (!h)
	{
		if (buffer)
			*buffer = NULL;
		return -1;
	}

	if (!buffer)
	{
		fclose(h);
		return len;
	}

	buf = Z_Malloc(len);
	*buffer = buf;

	FS_Read(buf, len, h);

	fclose(h);

	return len;
}

void Prompt_LoadHistory( commandPrompt_t *prompt, const char *filename ) {
    char buffer[MAX_FIELD_TEXT];
    qhandle_t f;
    int i;
    ssize_t len;

    FS_FOpenFile( filename, &f, FS_MODE_READ|FS_TYPE_REAL|FS_PATH_BASE );
    if( !f ) {
        return;
    }

    for( i = 0; i < HISTORY_SIZE; i++ ) {
        if( ( len = FS_ReadLine( f, buffer, sizeof( buffer ) ) ) < 1 ) {
            break;
        }
        if( prompt->history[i] ) {
            Z_Free( prompt->history[i] );
        }
        prompt->history[i] = memcpy( Z_Malloc( len + 1 ), buffer, len + 1 );
    }

    FS_FCloseFile( f );

    prompt->historyLineNum = i;
    prompt->inputLineNum = i;
}

void Prompt_SaveHistory( commandPrompt_t *prompt, const char *filename, int lines ) {
    qhandle_t f;
    char *s;
    int i;

    FS_FOpenFile( filename, &f, FS_MODE_WRITE|FS_PATH_BASE );
    if( !f ) {
        return;
    }

    if( lines > HISTORY_SIZE ) {
        lines = HISTORY_SIZE;
    }

    i = prompt->inputLineNum - lines;
    if( i < 0 ) {
        i = 0;
    }
    for( ; i < prompt->inputLineNum; i++ ) {
        s = prompt->history[i & HISTORY_MASK];
        if( s ) {
            FS_FPrintf( f, "%s\n", s );
        }
    }

    FS_FCloseFile( f );
}

static int read_binary_file(const char *name)
{
    qhandle_t f;
    size_t len;

    len = FS_FOpenFile(name, &f, FS_MODE_READ | FS_TYPE_REAL | FS_PATH_GAME);
    if (!f)
        return -1;

    if (len > MAX_MSGLEN)
        goto fail;

    if (FS_Read(msg_read_buffer, len, f) != len)
        goto fail;

    SZ_Init(&msg_read, msg_read_buffer, len);
    msg_read.cursize = len;

    FS_FCloseFile(f);
    return 0;

fail:
    FS_FCloseFile(f);
    return -1;
}

/*
* SNAP_WriteDemoMetaData
*/
void SNAP_WriteDemoMetaData( const char *filename, const char *meta_data, size_t meta_data_realsize )
{
	unsigned i;
	unsigned v;
	char tmpn[256];
	int filenum, filelen;
	msg_t msg;
	uint8_t msg_buffer[MAX_MSGLEN];
	void *compressed_msg;

	MSG_Init( &msg, msg_buffer, sizeof( msg_buffer ) );

	// write to a temp file
	v = 0;
	for( i = 0; filename[i]; i++ ) {
		v = ( v + i ) * 37 + tolower( filename[i] ); // case insensitivity
	}
	Q_snprintfz( tmpn, sizeof( tmpn ), "%u.tmp", v );

	if( FS_FOpenFile( tmpn, &filenum, FS_WRITE|SNAP_DEMO_GZ ) == -1 ) {
		return;
	}

	SNAP_DemoMetaDataMessage( &msg, meta_data, meta_data_realsize );
	SNAP_RecordDemoMetaDataMessage( filenum, &msg );

	// now open the original file in update mode and overwrite metadata

	// important note: we need to the load the temp file before closing it
	// because in the case of gz compression, closing the file may actually
	// write some data we don't want to copy
	filelen = FS_LoadFile( tmpn, &compressed_msg, NULL, 0 );

	if( compressed_msg ) {
		int origfile;

		if( FS_FOpenFile( filename, &origfile, FS_READ|FS_UPDATE ) != -1 ) {
			FS_Write( compressed_msg, filelen, origfile );
			FS_FCloseFile( origfile );
		}
		FS_FreeFile( compressed_msg );
	}

	FS_FCloseFile( filenum );

	FS_RemoveFile( tmpn );
}

/*
* CL_ReadServerCache
*/
void CL_ReadServerCache( void )
{
	int filelen, filehandle;
	qbyte *buf = NULL;
	char *ptr, *token;
	netadr_t adr;
	char adrString[64];
	qboolean favorite = qfalse;

	filelen = FS_FOpenFile( SERVERSFILE, &filehandle, FS_READ );
	if( !filehandle || filelen < 1 )
	{
		FS_FCloseFile( filehandle );
	}
	else
	{
		buf = Mem_TempMalloc( filelen + 1 );
		filelen = FS_Read( buf, filelen, filehandle );
		FS_FCloseFile( filehandle );
	}

	if( !buf )
		return;

	ptr = ( char * )buf;
	while( ptr )
	{
		token = COM_ParseExt( &ptr, qtrue );
		if( !token[0] )
			break;

		if( !Q_stricmp( token, "master" ) )
		{
			favorite = qfalse;
			continue;
		}

		if( !Q_stricmp( token, "favorites" ) )
		{
			favorite = qtrue;
			continue;
		}

		if( NET_StringToAddress( token, &adr ) )
		{
			Q_strncpyz( adrString, token, sizeof( adrString ) );
			token = COM_ParseExt( &ptr, qfalse );
			if( !token[0] )
				continue;

			if( favorite )
				CL_AddServerToList( &favoritesList, adrString, (unsigned int)atoi( token ) );
			else
				CL_AddServerToList( &masterList, adrString, (unsigned int)atoi( token ) );
		}
	}

	Mem_TempFree( buf );
}

/*
=================
S_OpenBackgroundTrack
=================
*/
static qboolean S_OpenBackgroundTrack (char *name, bgTrack_t *track)
{
	OggVorbis_File	*vorbisFile;
	vorbis_info		*vorbisInfo;
	ov_callbacks	vorbisCallbacks = {ovc_read, ovc_seek, ovc_close, ovc_tell};
#ifdef OGG_DIRECT_FILE
	char	filename[1024];
	char	*path = NULL;
#endif

//	Com_Printf("Opening background track: %s\n", name);

#ifdef OGG_DIRECT_FILE
	do {
		path = FS_NextPath( path );
		Com_sprintf( filename, sizeof(filename), "%s/%s", path, name );
		if ( (track->file = fopen(filename, "rb")) != 0)
			break;
	} while ( path );
#else
	FS_FOpenFile(name, &track->file);
#endif
	if (!track->file)
	{
		Com_Printf("S_OpenBackgroundTrack: couldn't find %s\n", name);
		return false;
	}

	track->vorbisFile = vorbisFile = Z_Malloc(sizeof(OggVorbis_File));

//	Com_Printf("Opening callbacks for background track\n");

	// bombs out here- ovc_read, FS_Read 0 bytes error
	if (ov_open_callbacks(track, vorbisFile, NULL, 0, vorbisCallbacks) < 0)
	{
		Com_Printf("S_OpenBackgroundTrack: couldn't open OGG stream (%s)\n", name);
		return false;
	}

//	Com_Printf("Getting info for background track\n");

	vorbisInfo = ov_info(vorbisFile, -1);
	if (vorbisInfo->channels != 1 && vorbisInfo->channels != 2)
	{
		Com_Printf("S_OpenBackgroundTrack: only mono and stereo OGG files supported (%s)\n", name);
		return false;
	}

	track->start = ov_raw_tell(vorbisFile);
	track->rate = vorbisInfo->rate;
	track->width = 2;
	track->channels = vorbisInfo->channels; // Knightmare added
	track->format = (vorbisInfo->channels == 2) ? AL_FORMAT_STEREO16 : AL_FORMAT_MONO16;

//	Com_Printf("Vorbis info: frequency: %i channels: %i bitrate: %i\n",
//		vorbisInfo->rate, vorbisInfo->channels, vorbisInfo->bitrate_nominal);

	return true;
}

/*
==================
SV_BeginDemoServer
==================
*/
void SV_BeginDemoserver(void){
	char	name[MAX_OSPATH];

	Com_sprintf(name, sizeof(name), "demos/%s", sv.name);
	FS_FOpenFile(name, &sv.demofile);
	if(!sv.demofile)
		Com_Error(ERR_DROP, "Couldn't open %s\n", name);
}