files.c

quakeIII源码这个不用我多说吧

	// FIXME: is c: allowed???
	if ( strstr( OSPath, ".." ) || strstr( OSPath, "::" ) ) {
		Com_Printf( "WARNING: refusing to create relative path \"%s\"\n", OSPath );
		return qtrue;
	}

	for (ofs = OSPath+1 ; *ofs ; ofs++) {
		if (*ofs == PATH_SEP) {	
			// create the directory
			*ofs = 0;
			Sys_Mkdir (OSPath);
			*ofs = PATH_SEP;
		}
	}
	return qfalse;
}

/*
=================
FS_CopyFile

Copy a fully specified file from one place to another
=================
*/
static void FS_CopyFile( char *fromOSPath, char *toOSPath ) {
	FILE	*f;
	int		len;
	byte	*buf;

	Com_Printf( "copy %s to %s\n", fromOSPath, toOSPath );

	if (strstr(fromOSPath, "journal.dat") || strstr(fromOSPath, "journaldata.dat")) {
		Com_Printf( "Ignoring journal files\n");
		return;
	}

	f = fopen( fromOSPath, "rb" );
	if ( !f ) {
		return;
	}
	fseek (f, 0, SEEK_END);
	len = ftell (f);
	fseek (f, 0, SEEK_SET);

	// we are using direct malloc instead of Z_Malloc here, so it
	// probably won't work on a mac... Its only for developers anyway...
	buf = malloc( len );
	if (fread( buf, 1, len, f ) != len)
		Com_Error( ERR_FATAL, "Short read in FS_Copyfiles()\n" );
	fclose( f );

	if( FS_CreatePath( toOSPath ) ) {
		return;
	}

	f = fopen( toOSPath, "wb" );
	if ( !f ) {
		return;
	}
	if (fwrite( buf, 1, len, f ) != len)
		Com_Error( ERR_FATAL, "Short write in FS_Copyfiles()\n" );
	fclose( f );
	free( buf );
}

/*
===========
FS_Remove

===========
*/
static void FS_Remove( const char *osPath ) {
	remove( osPath );
}

/*
================
FS_FileExists

Tests if the file exists in the current gamedir, this DOES NOT
search the paths.  This is to determine if opening a file to write
(which always goes into the current gamedir) will cause any overwrites.
NOTE TTimo: this goes with FS_FOpenFileWrite for opening the file afterwards
================
*/
qboolean FS_FileExists( const char *file )
{
	FILE *f;
	char *testpath;

	testpath = FS_BuildOSPath( fs_homepath->string, fs_gamedir, file );

	f = fopen( testpath, "rb" );
	if (f) {
		fclose( f );
		return qtrue;
	}
	return qfalse;
}

/*
================
FS_SV_FileExists

Tests if the file exists 
================
*/
qboolean FS_SV_FileExists( const char *file )
{
	FILE *f;
	char *testpath;

	testpath = FS_BuildOSPath( fs_homepath->string, file, "");
	testpath[strlen(testpath)-1] = '\0';

	f = fopen( testpath, "rb" );
	if (f) {
		fclose( f );
		return qtrue;
	}
	return qfalse;
}


/*
===========
FS_SV_FOpenFileWrite

===========
*/
fileHandle_t FS_SV_FOpenFileWrite( const char *filename ) {
	char *ospath;
	fileHandle_t	f;

	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	ospath = FS_BuildOSPath( fs_homepath->string, filename, "" );
	ospath[strlen(ospath)-1] = '\0';

	f = FS_HandleForFile();
	fsh[f].zipFile = qfalse;

	if ( fs_debug->integer ) {
		Com_Printf( "FS_SV_FOpenFileWrite: %s\n", ospath );
	}

	if( FS_CreatePath( ospath ) ) {
		return 0;
	}

	Com_DPrintf( "writing to: %s\n", ospath );
	fsh[f].handleFiles.file.o = fopen( ospath, "wb" );

	Q_strncpyz( fsh[f].name, filename, sizeof( fsh[f].name ) );

	fsh[f].handleSync = qfalse;
	if (!fsh[f].handleFiles.file.o) {
		f = 0;
	}
	return f;
}

/*
===========
FS_SV_FOpenFileRead
search for a file somewhere below the home path, base path or cd path
we search in that order, matching FS_SV_FOpenFileRead order
===========
*/
int FS_SV_FOpenFileRead( const char *filename, fileHandle_t *fp ) {
	char *ospath;
	fileHandle_t	f = 0;

	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	f = FS_HandleForFile();
	fsh[f].zipFile = qfalse;

	Q_strncpyz( fsh[f].name, filename, sizeof( fsh[f].name ) );

	// don't let sound stutter
	S_ClearSoundBuffer();

  // search homepath
	ospath = FS_BuildOSPath( fs_homepath->string, filename, "" );
	// remove trailing slash
	ospath[strlen(ospath)-1] = '\0';

	if ( fs_debug->integer ) {
		Com_Printf( "FS_SV_FOpenFileRead (fs_homepath): %s\n", ospath );
	}

	fsh[f].handleFiles.file.o = fopen( ospath, "rb" );
	fsh[f].handleSync = qfalse;
  if (!fsh[f].handleFiles.file.o)
  {
    // NOTE TTimo on non *nix systems, fs_homepath == fs_basepath, might want to avoid
    if (Q_stricmp(fs_homepath->string,fs_basepath->string))
    {
      // search basepath
      ospath = FS_BuildOSPath( fs_basepath->string, filename, "" );
      ospath[strlen(ospath)-1] = '\0';

      if ( fs_debug->integer )
      {
        Com_Printf( "FS_SV_FOpenFileRead (fs_basepath): %s\n", ospath );
      }

      fsh[f].handleFiles.file.o = fopen( ospath, "rb" );
      fsh[f].handleSync = qfalse;

      if ( !fsh[f].handleFiles.file.o )
      {
        f = 0;
      }
    }
  }

	if (!fsh[f].handleFiles.file.o) {
    // search cd path
    ospath = FS_BuildOSPath( fs_cdpath->string, filename, "" );
    ospath[strlen(ospath)-1] = '\0';

    if (fs_debug->integer)
    {
      Com_Printf( "FS_SV_FOpenFileRead (fs_cdpath) : %s\n", ospath );
    }

	  fsh[f].handleFiles.file.o = fopen( ospath, "rb" );
	  fsh[f].handleSync = qfalse;

	  if( !fsh[f].handleFiles.file.o ) {
	    f = 0;
	  }
  }
  
	*fp = f;
	if (f) {
		return FS_filelength(f);
	}
	return 0;
}


/*
===========
FS_SV_Rename

===========
*/
void FS_SV_Rename( const char *from, const char *to ) {
	char			*from_ospath, *to_ospath;

	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	// don't let sound stutter
	S_ClearSoundBuffer();

	from_ospath = FS_BuildOSPath( fs_homepath->string, from, "" );
	to_ospath = FS_BuildOSPath( fs_homepath->string, to, "" );
	from_ospath[strlen(from_ospath)-1] = '\0';
	to_ospath[strlen(to_ospath)-1] = '\0';

	if ( fs_debug->integer ) {
		Com_Printf( "FS_SV_Rename: %s --> %s\n", from_ospath, to_ospath );
	}

	if (rename( from_ospath, to_ospath )) {
		// Failed, try copying it and deleting the original
		FS_CopyFile ( from_ospath, to_ospath );
		FS_Remove ( from_ospath );
	}
}



/*
===========
FS_Rename

===========
*/
void FS_Rename( const char *from, const char *to ) {
	char			*from_ospath, *to_ospath;

	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	// don't let sound stutter
	S_ClearSoundBuffer();

	from_ospath = FS_BuildOSPath( fs_homepath->string, fs_gamedir, from );
	to_ospath = FS_BuildOSPath( fs_homepath->string, fs_gamedir, to );

	if ( fs_debug->integer ) {
		Com_Printf( "FS_Rename: %s --> %s\n", from_ospath, to_ospath );
	}

	if (rename( from_ospath, to_ospath )) {
		// Failed, try copying it and deleting the original
		FS_CopyFile ( from_ospath, to_ospath );
		FS_Remove ( from_ospath );
	}
}

/*
==============
FS_FCloseFile

If the FILE pointer is an open pak file, leave it open.

For some reason, other dll's can't just cal fclose()
on files returned by FS_FOpenFile...
==============
*/
void FS_FCloseFile( fileHandle_t f ) {
	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	if (fsh[f].streamed) {
		Sys_EndStreamedFile(f);
	}
	if (fsh[f].zipFile == qtrue) {
		unzCloseCurrentFile( fsh[f].handleFiles.file.z );
		if ( fsh[f].handleFiles.unique ) {
			unzClose( fsh[f].handleFiles.file.z );
		}
		Com_Memset( &fsh[f], 0, sizeof( fsh[f] ) );
		return;
	}

	// we didn't find it as a pak, so close it as a unique file
	if (fsh[f].handleFiles.file.o) {
		fclose (fsh[f].handleFiles.file.o);
	}
	Com_Memset( &fsh[f], 0, sizeof( fsh[f] ) );
}

/*
===========
FS_FOpenFileWrite

===========
*/
fileHandle_t FS_FOpenFileWrite( const char *filename ) {
	char			*ospath;
	fileHandle_t	f;

	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	f = FS_HandleForFile();
	fsh[f].zipFile = qfalse;

	ospath = FS_BuildOSPath( fs_homepath->string, fs_gamedir, filename );

	if ( fs_debug->integer ) {
		Com_Printf( "FS_FOpenFileWrite: %s\n", ospath );
	}

	if( FS_CreatePath( ospath ) ) {
		return 0;
	}

	// enabling the following line causes a recursive function call loop
	// when running with +set logfile 1 +set developer 1
	//Com_DPrintf( "writing to: %s\n", ospath );
	fsh[f].handleFiles.file.o = fopen( ospath, "wb" );

	Q_strncpyz( fsh[f].name, filename, sizeof( fsh[f].name ) );

	fsh[f].handleSync = qfalse;
	if (!fsh[f].handleFiles.file.o) {
		f = 0;
	}
	return f;
}

/*
===========
FS_FOpenFileAppend

===========
*/
fileHandle_t FS_FOpenFileAppend( const char *filename ) {
	char			*ospath;
	fileHandle_t	f;

	if ( !fs_searchpaths ) {
		Com_Error( ERR_FATAL, "Filesystem call made without initialization\n" );
	}

	f = FS_HandleForFile();
	fsh[f].zipFile = qfalse;

	Q_strncpyz( fsh[f].name, filename, sizeof( fsh[f].name ) );

	// don't let sound stutter
	S_ClearSoundBuffer();

	ospath = FS_BuildOSPath( fs_homepath->string, fs_gamedir, filename );

	if ( fs_debug->integer ) {
		Com_Printf( "FS_FOpenFileAppend: %s\n", ospath );
	}

	if( FS_CreatePath( ospath ) ) {
		return 0;
	}

	fsh[f].handleFiles.file.o = fopen( ospath, "ab" );
	fsh[f].handleSync = qfalse;
	if (!fsh[f].handleFiles.file.o) {
		f = 0;
	}
	return f;
}

/*
===========
FS_FilenameCompare

Ignore case and seprator char distinctions
===========
*/
qboolean FS_FilenameCompare( const char *s1, const char *s2 ) {
	int		c1, c2;
	
	do {
		c1 = *s1++;
		c2 = *s2++;

		if (c1 >= 'a' && c1 <= 'z') {
			c1 -= ('a' - 'A');
		}
		if (c2 >= 'a' && c2 <= 'z') {
			c2 -= ('a' - 'A');
		}

		if ( c1 == '\\' || c1 == ':' ) {
			c1 = '/';
		}
		if ( c2 == '\\' || c2 == ':' ) {
			c2 = '/';
		}
		
		if (c1 != c2) {
			return -1;		// strings not equal
		}
	} while (c1);
	
	return 0;		// strings are equal
}

/*
===========
FS_ShiftedStrStr
===========
*/
char *FS_ShiftedStrStr(const char *string, const char *substring, int shift) {
	char buf[MAX_STRING_TOKENS];
	int i;

	for (i = 0; substring[i]; i++) {
		buf[i] = substring[i] + shift;
	}
	buf[i] = '\0';
	return strstr(string, buf);
}

/*
===========
FS_FOpenFileRead

Finds the file in the search path.
Returns filesize and an open FILE pointer.
Used for streaming data out of either a
separate file or a ZIP file.
===========
*/
extern qboolean		com_fullyInitialized;

int FS_FOpenFileRead( const char *filename, fileHandle_t *file, qboolean uniqueFILE ) {
	searchpath_t	*search;
	char			*netpath;
	pack_t			*pak;
	fileInPack_t	*pakFile;