Combine split .dms files?

Photon · 21 November 2006, 14:57

Downloaded some megademos from ftp and most of them are split in half (to fit on PC floppys I guess). Stupid question maybe, but how do I combine them to one .dms to run in WinUAE? Mounting each half in DF0: and DF1: in WinUAE and copy tracks with X-Copy or something would take too much time I think

thor · 21 November 2006, 15:02

Does this work: copy /b first.dms+second.dms final.dms?

Belgarath · 21 November 2006, 15:03

copy /b is the method I always use for joining split .dms files.

Adderly · 21 November 2006, 17:16

Strange that this works for you.

I always depack the two dms parts to adf-images and then join the adf files.
If you join two dms files you have the header of the second dms-file added in the middle of the joined file and at least the popular XDMS cannot depack those files!
Just tested: original amiga DMS can depack those joined dms files, seems it ignores the second header information. Dunno about Winuae's dms handling....

Photon · 21 November 2006, 18:53

Did the copy /b, got a file of the right size, WinUAE guru'd when I opened it.

Anyone have a link to a clear and concise description of the .dms format? Might do a quick PC utility...

Photon · 21 November 2006, 19:17

Found a description here:

http://lclevy.club.fr/amiga/DMS.txt

If I do a utility I will limit it to two .dms files, only use track info to see if they are contiguous and don't overlap, and I won't interpret the track data at all, just form a new file with a (modified) single header.

I'll see if I can do it tonight... meanwhile, anyone see a problem with that method?

Photon · 21 November 2006, 19:38

Hmm, might get trouble with unpacked/packed CRC, especially unpacked CRC since I don't want to unpack it... Is it a simple 16-bit sum, so I can add the words from the respective .dms files to join? But it's probably a "proper" CRC though, is it the 16-bit IBM CRC, or what flavor. Argh.

Codetapper · 21 November 2006, 19:39

Why not just insert a blank disk, unpack the first DMS to it (using DMS of course), then unpack the second DMS and now you have the complete ADF? It won't matter if tracks overlap or anything.

Adderly · 21 November 2006, 22:50

Codetapper is right. It's very easy, no tool coding needed. You can also use xdms to unpack both splitted dms files and then a simple copy /b later you have what you want...
Dms used the x^16+x^15+x^2+1 polynom as CRC-16 for the headers and for all tracks.

Photon · 25 November 2006, 01:09

CodeTapper, Adderly, sure - but then I have to do that for every megademo I've downloaded from scene.org... As a programmer I like niftier solutions, if possible

I mean, there are tons of split archives out there...

Quote:

Originally Posted by Adderly

Dms used the x^16+x^15+x^2+1 polynom as CRC-16 for the headers and for all tracks.

Right, so it's not possible to combine the checksums without interpreting the compressed or uncompressed data. Gah.

thor · 25 November 2006, 02:28

You could make a batch file for using xdms:

Code:

xdms.exe u %1.dms
xdms.exe u %2.dms
copy /b %1.adf+%2.adf %3.adf

Then you can write

Code:

xdms.bat part1 part2 final

(without endings!) for joining part1.dms and part2.dms to final.adf.

Or you can replace

Code:

fo = fopen(oname,"wb");

with

Code:

fo = fopen(oname,"ab");

in pfile.c of the xdms sources and then you can use the batch file

Code:

if exist %3 goto error
xdms.exe u %1 +%3
xdms.exe u %2 +%3
goto end
:error
echo Output file %3 exists already
:end

This way you can use it with endings or without.

Phiber · 25 November 2006, 11:00

I remember asking this question a few years back.. AFAIR never really got a decent answer back then.. maybe this time..?

Photon · 25 November 2006, 18:09

Thor: Sweet. Might do a simple shell for it that does a search for split archives in the directory of choice and turns them all into .adfs.

andreas · 30 November 2006, 22:29

@Phiber: well Heikki aka "shd" has taken over xDMS development from Andre.
=> http://zakalwe.fi/~shd/foss/xdms/

He's been absent for ages now, but if anyone is interested in adding this, it's him - Andre doesn't have time for that stuff anymore.

Paul · 01 December 2006, 11:07

Also see this thread
http://eab.abime.net/showthread.php?t=25018

chip · 14 September 2017, 21:39

You can use ADF Workshop

There's a command called "Merge some files..." which can be used to put together the splitted .dms

21 November 2006, 14:57	#1
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,602	Combine split .dms files? Downloaded some megademos from ftp and most of them are split in half (to fit on PC floppys I guess). Stupid question maybe, but how do I combine them to one .dms to run in WinUAE? Mounting each half in DF0: and DF1: in WinUAE and copy tracks with X-Copy or something would take too much time I think

25 November 2006, 02:28	#11
thor Registered User Join Date: Mar 2006 Location: Germany Posts: 899	You could make a batch file for using xdms: Code: xdms.exe u %1.dms xdms.exe u %2.dms copy /b %1.adf+%2.adf %3.adf Then you can write Code: xdms.bat part1 part2 final (without endings!) for joining part1.dms and part2.dms to final.adf. Or you can replace Code: fo = fopen(oname,"wb"); with Code: fo = fopen(oname,"ab"); in pfile.c of the xdms sources and then you can use the batch file Code: if exist %3 goto error xdms.exe u %1 +%3 xdms.exe u %2 +%3 goto end :error echo Output file %3 exists already :end This way you can use it with endings or without.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
How to find out what files are missing? [split from "Reactions to GBA v1.4 release"]	formater	project.MAGE	1	03 June 2007 17:45
DMS files	RokChild	support.WinUAE	2	28 May 2007 09:47
Split .DMS files - splicing them back together	Phiber	New to Emulation or Amiga scene	6	04 May 2003 12:51
DMS files	Mr Creosote	New to Emulation or Amiga scene	3	27 October 2002 14:07

21 November 2006, 15:02	#2
thor Registered User Join Date: Mar 2006 Location: Germany Posts: 899	Does this work: copy /b first.dms+second.dms final.dms?

21 November 2006, 15:03	#3
Belgarath HOL Team Member Join Date: Dec 2001 Location: Manchester Posts: 2,513	copy /b is the method I always use for joining split .dms files.

21 November 2006, 17:16	#4
Adderly [Satan^God] Join Date: Oct 2005 Location: Germany Posts: 701	Strange that this works for you. I always depack the two dms parts to adf-images and then join the adf files. If you join two dms files you have the header of the second dms-file added in the middle of the joined file and at least the popular XDMS cannot depack those files! Just tested: original amiga DMS can depack those joined dms files, seems it ignores the second header information. Dunno about Winuae's dms handling....

21 November 2006, 18:53	#5
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,602	Did the copy /b, got a file of the right size, WinUAE guru'd when I opened it. Anyone have a link to a clear and concise description of the .dms format? Might do a quick PC utility...

21 November 2006, 19:17	#6
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,602	Found a description here: http://lclevy.club.fr/amiga/DMS.txt If I do a utility I will limit it to two .dms files, only use track info to see if they are contiguous and don't overlap, and I won't interpret the track data at all, just form a new file with a (modified) single header. I'll see if I can do it tonight... meanwhile, anyone see a problem with that method?

21 November 2006, 19:38	#7
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,602	Hmm, might get trouble with unpacked/packed CRC, especially unpacked CRC since I don't want to unpack it... Is it a simple 16-bit sum, so I can add the words from the respective .dms files to join? But it's probably a "proper" CRC though, is it the 16-bit IBM CRC, or what flavor. Argh.

21 November 2006, 19:39	#8
Codetapper 2 contact me: email only! Join Date: May 2001 Location: Auckland / New Zealand Posts: 3,182	Why not just insert a blank disk, unpack the first DMS to it (using DMS of course), then unpack the second DMS and now you have the complete ADF? It won't matter if tracks overlap or anything.

21 November 2006, 22:50	#9
Adderly [Satan^God] Join Date: Oct 2005 Location: Germany Posts: 701	Codetapper is right. It's very easy, no tool coding needed. You can also use xdms to unpack both splitted dms files and then a simple copy /b later you have what you want... Dms used the x^16+x^15+x^2+1 polynom as CRC-16 for the headers and for all tracks.

25 November 2006, 11:00	#12
Phiber Hardware Freak Join Date: May 2002 Location: Helsinki / Finland Age: 50 Posts: 222	I remember asking this question a few years back.. AFAIR never really got a decent answer back then.. maybe this time..?

25 November 2006, 18:09	#13
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,602	Thor: Sweet. Might do a simple shell for it that does a search for split archives in the directory of choice and turns them all into .adfs.

30 November 2006, 22:29	#14
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	@Phiber: well Heikki aka "shd" has taken over xDMS development from Andre. => http://zakalwe.fi/~shd/foss/xdms/ He's been absent for ages now, but if anyone is interested in adding this, it's him - Andre doesn't have time for that stuff anymore.

01 December 2006, 11:07	#15
Paul RIP Friends Join Date: Sep 2005 Location: UK Posts: 2,157	Also see this thread http://eab.abime.net/showthread.php?t=25018

14 September 2017, 21:39	#16
chip Registered User Join Date: Oct 2012 Location: Italy Age: 49 Posts: 2,941	You can use ADF Workshop There's a command called "Merge some files..." which can be used to put together the splitted .dms

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)