[Help] hashing(Digest) problem

Fileburner Joined: 04/29/09 Posts: 2

Posted: 09/15/09 15:59:34 Modified: 09/15/09 16:09:24 Hello everyone, I am new to D programming language, and I am having some problems :P ok here is my problem I am trying to hash(Digest) a file using Tango's predefined digests. here is the code I used public void hashTestMethod(char[] filePath){ Md5 d = new Md5(); auto f = new FileConduit(filePath); ubyte[] buffer = new ubyte[2048*1024]; int i = f.read(buffer); while (i!=f.Eof){ d.update(buffer); i = f.read(buffer); } txtResult.setText(d.hexDigest()); f.close(); } using this code I get a wrong result, but if I use the followig code I get the right result public void hashTestMethod(char[] filePath){ Md5 d = new Md5(); auto f = new FileConduit(filePath); d.update(f.load()); txtResult.setText(d.hexDigest()); f.close(); } but the previous code loads the whole file to the memory which is not a good Idea can anyone guide me to a proper way using buffers also if anyone can point me to a threading tutorial in D (how data is shared between threads, concurency management ....) thank you. Fileburner.

Author	Message
kris Joined: 03/27/04 Posts: 581	Posted: 09/15/09 22:39:12 Subtle change to update only what was read: while (i != f.Eof) { d.update (buffer[0..i]); i = f.read (buffer); } See the slice operation within d.update? This takes care of a partial read at the end of the file. You might also look at tango.io.stream.Digest, which does a similar kind of thing
Fileburner Joined: 04/29/09 Posts: 2	Posted: 09/16/09 15:20:09 thank you very much for your reply, now it works :D I almost forgot about array slicing, the strange thing I noticed is that whenever I change the buffer's size the hash result changes thank you