Copyright 1997-2003 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by John D. Polstra.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
MODULE FileID;
IMPORT
DevT, FileAttr, FileAttrRep, Utypes, Word;
REVEAL
T = BRANDED REF RECORD
device: Utypes.dev_t;
inode: Utypes.ino_t;
END;
PROCEDURE FromAttr(fa: FileAttr.T): T =
BEGIN
IF NOT FileAttr.AttrType.Dev IN fa.mask
OR NOT FileAttr.AttrType.Inode IN fa.mask THEN
RETURN NIL;
END;
RETURN NEW(T, device := fa.stat.st_dev, inode := fa.stat.st_ino);
END FromAttr;
PROCEDURE Equal(a, b: T): BOOLEAN =
BEGIN
RETURN a.inode = b.inode AND DevT.Equal(a.device, b.device);
END Equal;
PROCEDURE Hash(fid: T): Word.T =
BEGIN
RETURN Word.Xor(DevT.Hash(fid.device), DevT.Hash(fid.inode));
END Hash;
BEGIN
END FileID.