[Coco] OS9 Arc

[William Carlin]

I didn't make it clear that when doing that DW to DW copy you need to have
the drives visible so the current read/write sector is visible during the
copy.

William

On Thu, Jan 5, 2017 at 6:17 AM, William Carlin <whcarlinjr at gmail.com> wrote:

> Bill,
>
> If you do a DriveWire to DriveWire disk copy you can see that arc does
> re-read the file that was just copied when using the verify option.  But
> the source file is not read a second time.  This is what led me to believe
> some kind of checksum is used to do the verify.  I was wondering if the
> programmer used a shortcut and just utilized the built in CRC OS9 function
> call to perform this check.  I would be interested in that source code if
> you can find it.
>
> William
>
>
> On Wed, Jan 4, 2017 at 9:55 PM, L. Curtis Boyle <curtisboyle at sasktel.net>
> wrote:
>
>> Ah, thanks for the correction. This one sounds more like the STREAM
>> utility Bruce Isted did, that we used for years (I still do, on occasion).
>>
>> Sent from my iPhone
>>
>> > On Jan 4, 2017, at 8:20 PM, Bill Pierce via Coco <coco at maltedmedia.com>
>> wrote:
>> >
>> > Curtis, this isn't the "archiving" utility "dearc", it's a disk copy
>> utility called "arc" (as in arching files from one disk to another). It
>> checks the last modified date and keeps the newest version when a duplicate
>> exists on the disk.
>> > Here's the usage from arc:
>> >
>> > Usage: arc [-acdeflmuv] from_dir to_dir
>> >     a = all files
>> >     c = confirm file if not there
>> >     d = confirm non-existant directory
>> >     e = confirm existing directory
>> >     f = prevent copy of files
>> >    ln = only n levels of the tree (1..9)
>> >     m = do multilple (all) directories
>> >     v = verify the copy
>> >     u = force uppercase for comparisons
>> >
>> > As you can see, it copies files, directories, subdirectories, etc
>> > It's not an archiving util like zip or lzh.
>> >
>> >
>> >
>> >
>> >
>> >
>> > Bill Pierce
>> > "Charlie stole the handle, and the train it won't stop going, no way to
>> slow down!" - Ian Anderson - Jethro Tull
>> >
>> >
>> >
>> > My Music from the Tandy/Radio Shack Color Computer 2 & 3
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>> >
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>> >
>> >
>> >
>> >
>> >
>> >
>> > -----Original Message-----
>> > From: L. Curtis Boyle <curtisboyle at sasktel.net>
>> > To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>> > Sent: Wed, Jan 4, 2017 7:40 pm
>> > Subject: Re: [Coco] OS9 Arc
>> >
>> > Going off old memory, I am pretty sure it is a CRC check, like LHA and
>> ZIP. Sent from my iPhone> On Jan 4, 2017, at 5:36 PM, William Carlin <
>> whcarlinjr at gmail.com> wrote:> > I am continually amazed at the
>> resiliency and speed of the OS9 Arc> command.  I discovered it was one of
>> the included binaries on Bill's "XRoar> Coco 2b Becker Port Starter Kit".
>> Now I am flabbergasted that this program> works so well within the memory
>> constraints of the 64k Color Computer.> > I have always wondered about the
>> "verify" option in this program.  It does> not appear to be doing a "byte
>> by byte" comparison of the source and> destination files like the cmp
>> command does.  Does this program use some> kind of checksum to determine if
>> the destination file is different from the> source?  Is the source code for
>> this program available somewhere online?  I> checked though my extensive
>> archives of OS9 software and can only find the> binary archive but no
>> source code.> > William> > CoCo 4 ever> > -- > Coco mailing list>
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