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 MD5Wr;
IMPORT MD5, Thread, Wr, WrClass;
REVEAL
T = Public BRANDED OBJECT
wr: Wr.T;
closeChild: BOOLEAN;
md5: MD5.T;
signature: TEXT := NIL;
OVERRIDES
init := Init;
getSignature := GetSignature;
seek := Seek;
flush := Flush;
close := Close;
END;
PROCEDURE Close(self: T)
RAISES {Thread.Alerted, Wr.Failure} =
BEGIN
IF self.closeChild THEN
Wr.Close(self.wr);
END;
END Close;
PROCEDURE Flush(self: T)
RAISES {Thread.Alerted, Wr.Failure} =
BEGIN
Seek(self, self.cur);
Wr.Flush(self.wr);
END Flush;
PROCEDURE GetSignature(self: T): TEXT =
BEGIN
<* ASSERT self.closed *>
IF self.signature = NIL THEN
self.signature := self.md5.finish();
END;
RETURN self.signature;
END GetSignature;
PROCEDURE Init(self: T;
wr: Wr.T;
md5: MD5.T := NIL;
closeChild: BOOLEAN := TRUE): T =
BEGIN
WrClass.Lock(self);
TRY
self.wr := wr;
self.closeChild := closeChild;
self.md5 := md5;
IF self.md5 = NIL THEN self.md5 := MD5.New() END;
self.buff := NEW(REF ARRAY OF CHAR, 8192);
self.st := 0; (* Always *)
self.hi := NUMBER(self.buff^);
self.seekable := FALSE;
self.buffered := wr.buffered;
self.closed := FALSE;
FINALLY
WrClass.Unlock(self);
END;
RETURN self;
END Init;
PROCEDURE Seek(self: T; n: CARDINAL)
RAISES {Thread.Alerted, Wr.Failure} =
BEGIN
<* ASSERT n = self.cur *>
WITH data = SUBARRAY(self.buff^, 0, self.cur - self.lo) DO
Wr.PutString(self.wr, data);
self.md5.update(data);
END;
self.lo := self.cur;
self.hi := self.lo + NUMBER(self.buff^);
END Seek;
BEGIN
END MD5Wr.