Well, I'm just trying to answer Frieder's question(s). Until the doc on LINUX gets to where there are no more omissions of crucial words, ... like NOT ... I won't have time for it either. I've been trying to figure out how to get anything useful out of SDCC, but the instructions for Windows (Yes, I'm one of those ...)tell you how to build it, but say nothing about how to use it.
Since I'm not a big HLL fan for code bodies smaller than, say 250K lines, I don't suffer as a result, but I would like to find a simulator that can actually simulate object code output from the assembler, that's bigger than 2 KB. I find that that JSIM program merely sits there and looks back at me, but otherwise does nothing, and the TSCONTROLS EMU8051 or whatever it's called can't be upgraded, since their website has disappeared. ... <sigh> ... I just reported that virus detection in the latest SDCC file set. My scanner seems to have found and removed it, but there are folks who may not be so lucky. I did understand that those programs are checksum/CRC verification tools. I'd just never seen 'em or heard of 'em before, nor do I know where they're to be found. regards, Richard Erlacher ----- Original Message ----- From: "Richard Gray" <[EMAIL PROTECTED]> To: <sdcc-user@lists.sourceforge.net> Sent: Wednesday, August 27, 2008 11:49 AM Subject: Re: [Sdcc-user] Virus in SDCC-2.8.0-setup.exe - MD5 etc tutorial > md5sums, or sha1sum or whatever are a special type of checksum. In the > past, a > simple addition of all the byte values in any given file would give a > simple > total, and typically is/was used to distinguish EPROM contents/versions > from > one another. However, a simple checksum is not very robust, one bit > dropped > here and another added there can provide an identical checksum while two > files are actually very different. So, cleverer checksum methods have > since > been devised where a single bit change in file in question can produce a > radically different result, and thus it is much harder to produce two > different files with the same MD5 checksum, for example, and maybe even > impossible in many cases. If, by some miracle, one produced two files with > an > identical MD5 sum, it's almost beyond imagining that the SHA1 sums (a > different algorithm) would be the same too. The upshot is that a file > provided with a checksum is hard to tamper with undetected, unless the > checksum is also adjusted, of course. MD5 etc are known as hash > algorithms. > > md5sum etc are standard utilities on most unix/linux systems. I cannot > speak > for Windoze, but I kinda doubt MS can be bothered, but there are probably > 3rd > party versions available - if you can trust those! > > Examples (which might not mean much if you don't understand a unix command > line)... > > bash# echo "Richard Erlacher" | md5sum > 5d7a3bc8d9bbe8cbfdf2f53fe42f50f9 - > > The above 5d7a... number is the MD5 sum hash of "Richard Erlacher". > > Now make a tiny change... > > bash# echo "Richard erlacher" | md5sum > f3c78f69a11aa4dd432ac3fe35eb976b - > > Notice that the tiniest change to the string makes a massive difference in > the > MD5 sum. The upshot of this is that an MD5 sum of a file is a great way of > verifying if it has downloaded correctly - if the published MD5 doesn't > match > what you have downloaded, then there's a problem somewhere, because the > files > are different. A simple checksum might very well not detect defects or > indeed > deliberate alterations. > > I hope that helps! Let me know if I can explain further. > > On Wednesday 27 August 2008 18:07:37 Richard Erlacher wrote: >> ----- Original Message ----- >> From: "Frieder Ferlemann" <[EMAIL PROTECTED]> >> To: <sdcc-user@lists.sourceforge.net> >> Sent: Thursday, August 21, 2008 10:18 AM >> Subject: Re: [Sdcc-user] Virus in SDCC-2.8.0-setup.exe >> >> > Hi >> > >> > Richard Erlacher schrieb: >> >> I don't know how this happened, but my CA virus scanner turned up a >> >> virus (Win32FakeAV.CX) in SDCC-2.8.0-setup.exe. Forewarned is >> >> forearmed. >> > >> > Checksums of sdcc-2.8.0-setup.exe as downloaded today from >> > http://sourceforge.net/project/showfiles.php?group_id=599&package_id=2892 >> >1&release_id=587999 are: >> > >> > md5sum sdcc-2.8.0-setup.exe >> > bff1f75352a4897ee142a26a728c5e92 sdcc-2.8.0-setup.exe >> >> What's a md5sum? >> >> > sha1sum sdcc-2.8.0-setup.exe >> > f804e0d149b96219ca39084024b9f0e8c3fa0e41 sdcc-2.8.0-setup.exe >> > >> > sha256sum sdcc-2.8.0-setup.exe >> > fbb6ec3339d0b95759dcf57883fb912a2779dd198076760b9d52efc1b9e3ba62 >> > sdcc-2.8.0-setup.exe >> >> What's a sha256sum? >> >> > Does that match the file you downloaded? >> >> How would I check it? Am I supposed to have those utilities? >> >> regards, >> >> Richard Erlacher >> > <snip> > > -- > Richard. > PGP Key-id: 0x5AB3D350 > > An authority is a person who can tell you more about something than you > really care to know. > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the > world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Sdcc-user mailing list > Sdcc-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sdcc-user ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
