Squeak-dev January 2001

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112 participants
318 discussions

Re: Now we are talking dynabooks
by Hans-Martin Mosner 27 Jan '01

27 Jan '01

Karl Ramberg wrote: > Various online news sites poits to this site > http://www.dtcproducts.com/future.html > A 20$ laptop with Squeak would be something. > No spec. for porting though.... > > Karl Looks like super thin vapor for the moment. Hans-Martin

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Re: Plugin Security (Was Re: How do I create a SqueakPlugin.imagefrom a 2.9a ?)
by Hans-Martin Mosner 27 Jan '01

27 Jan '01

Luciano Notarfrancesco wrote: > (If you can use something like this to write into the > header of another object, you might be able to change > the size of an object making posible to do at:put:'s > beyond the object memory.) Try to find out what the attached piece of obfuscated Squeak computes :-) Especially, what's the meaning of the result of: "H h: nil"? Cheers, Hans-Martin 'From Squeak2.9alpha of 13 June 2000 [latest update: #2710] on 27 January 2001 at 2:59:37 pm'! Object subclass: #H instanceVariableNames: 'a ' classVariableNames: '' poolDictionaries: '' category: 'Hacking'! !H methodsFor: 'h' stamp: 'hmm 1/27/2001 14:55'! h: g | h | self become: g. h := a. self become: g. ^h! ! !H methodsFor: 'h' stamp: 'hmm 1/27/2001 14:56'! h: g h: b self become: g. a := b. self become: g! ! "-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- "! H class instanceVariableNames: ''! !H class methodsFor: 'h' stamp: 'hmm 1/27/2001 14:58'! h: x | h a b c d e | "H h: nil" h := self new. a := Object new. b := Bitmap new: 0. c := Array with: x. h h: a h: ((d := h h: a) bitOr: 4). e := b at: 2. h h: a h: d. ^e! !

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[ENH] celesteTweaks
by Lex Spoon 27 Jan '01

27 Jan '01

Thanks to everyone who put in two cents about Celeste. Here are some changes I've wanted to make, done in a way I think everyone will be happy with. -Lex "Change Set: celesteTweaks Date: 27 January 2001 Author: Lex Spoon Several tweaks to Celeste: 1. The custom menu button always presents a menu; matching filters are listed at the top of the the menu. 2. The auto-move button is removed. Instead, the regular TOC menu will give the option of an automove. 3. Huge message lists are not shown, but a menu item is added to forcibly show all messages. 4. The From Filter is switched to a Participant Filter."!

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Re: Colored Cursors - was: 3-button mice on Mac
by Henrik Gedenryd 27 Jan '01

27 Jan '01

Karl Ramberg wrote: > Is there a way to > preserve the alpha channel so we could have nice prerendered > antialiasing > on fonts and easy masking for cursors etc ? There already is prerendered aa, but this uses special blt modes rather than the alpha channel. What I did with cursors was to take any given morph and ask it to convert itself to a Form, then using that as a cursor. No problem with transparency. Transparent aa for cursors, now that's a different cat to skin. I think it would be too slow. Cursor drawing should be really fast. Henrik

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Re: Plugin Security (Was Re: How do I create a SqueakPlugin.imagefrom a 2.9a ?)
by Luciano Notarfrancesco 27 Jan '01

27 Jan '01

--- John.Maloney(a)disney.com wrote: > Luciano, > > How can you use #become: to write to an arbitrary > place in memory? I'm not quite seeing it... > Hmm... sorry John, I'm not seeing it neither. ;) I'm quite sure I had an idea to do this some months ago. Probably I just got confused. Anyway, here's another possible loophole, although not so easy to eploit at first sight. Over a year ago there was a discusion in the list about how to get the memory address of an object, and how to find the object corresponding to a given memory address. Someone showed that this can be done with no need to introduce new primitives. (The code is attached the end of this mail.) Now, if you are lucky enough to find something in memory that looks like a ByteArray, for instance, then you can send at:put: to that fake ByteArray. *OR*, you can create aByteArray whose contents look like the header of a very big ByteArray, and then you can get the object at aByteArray memoryAddress + aByteArray size. Using this you could do an at:put: to an arbitrary place in the heap above the object memory. Quite probably this can be used to execute arbitrary code, at least in linux. I'm sorry if this sounds pedant. It's just that I like so much this subject that I let myself go. > > Digital signatures are still useful to prove that > some bundle of bits came from a well-known agency, > such as Disney or Squeak Central. We may well use DSA > for system updates, VM distribution, etc. > Yes. That would be wonderful. As you point out, a full digital signature scheme for Squeak is impractical because it would require a big organization behind it. Anyway, Squeak is probably already a lot safer than many Microsoft systems ;) I'm not really "woried" about security issues in Squeak. The only reason I'm talking about this is that I like the subject of computer security, and it's specially interesting applied to Smalltalk. Cheers, Luciano.- __________________________________________________ Do You Yahoo!? Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free! http://photos.yahoo.com/

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Re: Meaningful Swiki URLs?
by Henrik Gedenryd 27 Jan '01

27 Jan '01

Jochen F. Rick wrote: > The problem with no numbers is that you cannot allow pages to change > names, or, if they do, the links from outside no longer work. > Yepp, that kind of makes the scheme impossible to rely on. I mean if changing the contents invalidates the URL, and anyone can edit any page, and not everyone is aware of the URL guessing scheme. This completely violates people's understandings of how URLs work. For all intents and purposes, this is not a URL, it's a malformed search request. If it looked like http:.../search="people" or so, then it would at least appear in a way that suggests how it works. I was asking about a way of referring to a page in a reliable way without having to remember arbitrary numbers. Henrik

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Re: [SqueakAudio] Portable Sound/MIDI API
by Lex Spoon 27 Jan '01

27 Jan '01

On the Unix port, only Linux and SunOS/Solaris are supported. Most every Unix has its own sound API. On the other hand, "PortMusic" seems to support no more platfoms than Squeak does already: "PortMusic is open-source and runs on Windows, Macintosh, and Linux." -Lex Juan Manuel Vuletich <jmvuletich(a)sinectis.com.ar> wrote: > Hi > It is interesting. But we already have basic sound i/o on most > platforms. I think the next step would be full duplex, multichannel > audio with guaranteed sync between inputs and outputs, and low latency. > I think we need ASIO support. > > "Stephen T. Pope" wrote: > > > > Hey VM hackers -- check this out! > > > > http://www.cs.cmu.edu/~music/portmusic/ > > > > -- > > > > stp > > Stephen Travis Pope > > http://www.create.ucsb.edu/~stp > > -- > Juan Manuel Vuletich > jmvuletich(a)sinectis.com.ar > Español: http://www.sinectis.com.ar/u/jmvuletich > English: http://www.sinectis.com.ar/u/jmvuletich/studio.html

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Squeak V3 (was: Final call for 2.9 updates)
by Bert Freudenberg 27 Jan '01

27 Jan '01

On Thu, 25 Jan 2001, Bob Arning wrote: > As you know, Dan plans on wrapping up 2.9 next week and issung a > 3.0alpha in preparation for putting Squeak on the web in a bigger way. I read that as a proposal and there was no positive reply to now. IMHO it would do no good to Squeak to jump to a new major version only for a condensed sources file. Who needs a sources file on the Web anyway? The current 2.8 Squeaklet image does just fine without. Developers like us can happily live with a multi-magabyte changes file. There were a lot of modifications proposed that would justify a new major version when finished: Morphic clean up, Network streaming support, new method format, actually using Exceptions, block closures, you name it. So why the rush? -- Bert

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Re: Final call for 2.9 updates
by Doug Way 27 Jan '01

27 Jan '01

Peter Schuller wrote: > > > I'll appreciate Whisker by Doug Way be in the standard image.... :) > > And how about the look and feel by said person? The first thing I hear from > people after convincing them to try Squeak is complaints on how old the GUI > looks. First-impressions are everything :) Sorry that I haven't been able to work on the look & feel changeset in the last week or so, I've been busy finishing up a new Whisker release for the Squeak CD. (Actually, my changeset was really just a new "look", the "feel" is basically unchanged.) I'm not sure if a new look changeset necessarily has to be in the 2.9 release in the next week. However, I think it would be very appropriate for a 3.0 release... a brand new look for a major release number increment. (Especially if there's not a lot of substantive changes in 3.0, it would at least be nice to have something noticeable change.) Along with that, I think it would be a GREAT opportunity to switch to having a Morphic project as the default startup project (still keeping MVC in the image, of course). PLEASE? :) I've argued before that it doesn't make any sense for Squeak to start up in MVC, since all of the recent SqC work has been in Morphic, half of the Preferences only apply to Morphic, the initial out-of-the-box MVC look is more off-putting, etc. Anyway, I will get back to tinkering with the new look next week... at least the menus should be adjusted to fit the look, and maybe buttons too. (Alternate looks from others would be welcome too, to compare and contrast, and borrow ideas from each other.) It sounded like 2.9 would be released in a week or so (for the Squeak CD), but what was the approximate timeframe for releasing 3.0? It sounded like it would be relatively soon... would that be a few weeks? A few months? - Doug Way dway(a)riskmetrics.com

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Alpha version of Squeak VM for WinCE MIPS HPC/Pro
by Ned Konz 27 Jan '01

27 Jan '01

I've posted a compiled VM and sources on my Swiki (which there's little else on, yet)... http://nedkonz.dhs.org:8080/Ned/6 Leave feedback (or mail to the list), please. -- Ned Konz currently: Stanwood, WA email: ned(a)bike-nomad.com homepage: http://bike-nomad.com

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