shatara@memit.dec.com (Chris Shatara) (08/26/89)
GS/OS V3.0 has a neat feature in the ICON Information "window" when
displaying a folder and that is a "use calculate icon" msg which
instructs you to click on the calculator icon to get the size info of what
is contained in the folder. There doesn't appear to be any reference to
this feature in the $49 manual set :-)
Anyhow I ran into a strange situation last night. I asked for the
information for a folder I had (which contained six files) and clicked on
the calc idon and got the following information:
SIZE: 126,524 bytes 643K on disk
This seems way out of whack with what I see when I do the same thing on my
other folders. I would expect the numbers to be about the same. I then
got information for each of the files in the folder individually and I got
the following:
file 1 577,536 bytes 567k on disk
file 2 65,496 bytes 65k on disk
file 3 4,354 bytes 5k on disk
file 4 2,077 bytes 3k on disk
file 5 1,041 bytes 2k on disk
file 6 158 bytes 1k on disk
Can anyone shed some light on this. I thought i knew what this feature
did but with this result I'm not quite sure.
/chris
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| Chris Shatara | Internet: shatara@memit.dec.com |
| | shatara@memit.enet.dec.com |
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=============================================================================dlyons@Apple.COM (David Lyons) (08/26/89)
In article <698@mountn.dec.com> shatara@memit.dec.com (Chris Shatara) writes: >[In Finder 1.3 Icon Info window for a folder] I asked for the >information for a folder I had (which contained six files) and clicked on >the calc idon and got the following information: > > SIZE: 126,524 bytes 643K on disk > >This seems way out of whack with what I see when I do the same thing on my >other folders. I would expect the numbers to be about the same. I then >got information for each of the files in the folder individually and I got >the following: > > file 1 577,536 bytes 567k on disk > file 2 65,496 bytes 65k on disk > file 3 4,354 bytes 5k on disk > file 4 2,077 bytes 3k on disk > file 5 1,041 bytes 2k on disk > file 6 158 bytes 1k on disk > >Can anyone shed some light on this. I thought i knew what this feature >did but with this result I'm not quite sure. My goodness...looks like a bug. The total is so *close* to being off by an exact multiple of 65536 ($10000) bytes, that it looks like the Finder is ignoring the high word of the file size. (Could the invisible Finder.Data file in your folder account for the missing 149 bytes?) Apparently, if all the files in a folder are smaller than 65536 bytes, the Finder will compute the correct "bytes used." There doesn't seem to be any problem with "k on disk," so you can still pay attention to that to get a rough idea of whether a folder is going to fit when you try to copy it onto another disk, for example. I'll report this to the FinderDudes. Note that you *can* legitimately have files with larger byte-sizes than their "k on disk" would indicate, at least on ProDOS disks. This is because ProDOS files can be "sparse"--long sequences of "zero" bytes don't take up blocks. --Dave Lyons, Apple Computer, Inc. | DAL Systems AppleLink--Apple Edition: DAVE.LYONS | P.O. Box 875 AppleLink--Personal Edition: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.
bh1e+@ANDREW.CMU.EDU (Brendan Gallagher Hoar) (08/28/89)
Speakind of sparse ProDOS files.... What is the recommended way to send sparse files using a telecommunications program? Thanks!
dlyons@Apple.COM (David Lyons) (08/29/89)
In article <UYyJBdS00WB347MHNI@andrew.cmu.edu> bh1e+@ANDREW.CMU.EDU (Brendan Gallagher Hoar) writes: >[...] >What is the recommended way to send sparse files using a telecommunications >program? Hmmm...now *there's* an interesting question. :-) There doesn't seem to be a recommended way. If the file isn't *too* sparse, just don't worry about it--you'll get a non-sparse file at the other end that's bigger than the original, if you receive/unpack it under ProDOS 8. (Under GS/OS, the resulting file will still be sparse, but you will have wasted some time transferring it.) If you have a *really* sparse file (e.g., 16 Megs, with 100 bytes of actual useful data), I recommend you use a telecommunications program to send a message to the recipient saying "What's your address? I need to mail you a disk." :-) (Or send a program that can create the file, instead.) --Dave Lyons, Apple Computer, Inc. | DAL Systems AppleLink--Apple Edition: DAVE.LYONS | P.O. Box 875 AppleLink--Personal Edition: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.
bh1e+@ANDREW.CMU.EDU (Brendan Gallagher Hoar) (08/31/89)
The question of the sparse file transmission came up because I had received an EXE file that is used to change already compiled programs into Expressload format... the destination file was about 1.5 to 2 times larger than the original file. idea: Hmmm...a neat way of copy protecting files... make it sparse, and have it check its size before running...anything that was copied under ProDOS 8 or transmitted over a modem ends up not working... great...wonderful evil thoughts I had thought that only text files could be sparse...guess I was wrong... :)