rawread: Making use of partial raw images

andreas · 23 September 2005, 11:59

When rawread is told to do a raw dump of an Amiga disk, it will create an extended ADF. That is a fact.

Though, if -- because of space limits with old Amigas like mine -- rawread is only told to image some chunks by calling it this way:

rawread -f dsk -s 0 -e 44 -r -x -1

it will *ALWAYS* (!!) write a UAE-1ADF header, i. e. even for every partial image, if s > 0!
This is awkward, as there is no way anymore to *simply* concatenate these three parts

Toni ... might there be any way to just CHOP OFF the header from the 2nd and 3rd image and then assemble the three again?
If so, how many bytes do I have to chop off then?

TIA...

andreas · 27 October 2005, 23:13

*bump*

Supamax · 01 January 2010, 15:49

This would be really interesting...
(the possibility to take some tracks from different extended adf files and merge them together in a destination extended adf file)

dlfrsilver · 01 January 2010, 15:53

apart if the track to merge comes from a game that comes from a different revision.

It won't work then.

Supamax · 01 January 2010, 15:56

Quote:

Originally Posted by dlfrsilver

apart if the track to merge comes from a game that comes from a different revision.

It won't work then.

Yes, I'm talking about tracks dumped from the same physical floppy

.
For example, when getting partially good dumps of the same disk.

Redwood · 02 January 2010, 02:02

It isn't possible to simply concatenate two extended (raw) adf images, because the length of each track is not fixed. The header contains information about the type and length of each track in the image, even if it's only partial.

In order to merge two images you need to merge their headers as well. I have some python code which I've used successfully to merge two extended adfs, and even to replace tracks from one extended adf with tracks from another.

The python code is an attachment to a post in this thread:

http://eab.abime.net/showthread.php?t=41479

Supamax · 02 January 2010, 05:37

Hi Redwood

,

I remember your posts

.
I don't understand python at all

... wouldn't it be possible to have your algorythm written in a more understandable language?

Redwood · 12 January 2010, 14:51

You may be interested in the new "rawadf" tool:

http://eab.abime.net/showthread.php?t=50160

23 September 2005, 11:59	#1
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	rawread: Making use of partial raw images When rawread is told to do a raw dump of an Amiga disk, it will create an extended ADF. That is a fact. Though, if -- because of space limits with old Amigas like mine -- rawread is only told to image some chunks by calling it this way: rawread -f dsk -s 0 -e 44 -r -x -1 it will ALWAYS (!!) write a UAE-1ADF header, i. e. even for every partial image, if s > 0! This is awkward, as there is no way anymore to simply concatenate these three parts Toni ... might there be any way to just CHOP OFF the header from the 2nd and 3rd image and then assemble the three again? If so, how many bytes do I have to chop off then? TIA... Last edited by andreas; 23 September 2005 at 12:09.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Raw images	VoltureX	Coders. General	24	16 November 2011 22:43
Rawread ^^	dlfrsilver	support.WinUAE	44	24 February 2009 02:58
Viewing raw images in correct colors	andreas	support.Other	7	22 August 2008 23:12
Partial yellowing?	Amiga1992	support.Hardware	21	04 July 2008 00:46
Making images of non-880K disks	TikTok	support.WinUAE	16	10 November 2001 00:15

27 October 2005, 23:13	#2
andreas Zone Friend Join Date: Jun 2001 Location: Germany Age: 50 Posts: 5,857	bump

01 January 2010, 15:49	#3
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	This would be really interesting... (the possibility to take some tracks from different extended adf files and merge them together in a destination extended adf file)

01 January 2010, 15:53	#4
dlfrsilver CaptainM68K-SPS France Join Date: Dec 2004 Location: Melun nearby Paris/France Age: 46 Posts: 10,412	apart if the track to merge comes from a game that comes from a different revision. It won't work then.

02 January 2010, 02:02	#6
Redwood Registered User Join Date: Jun 2008 Location: Sydney / Australia Posts: 83	It isn't possible to simply concatenate two extended (raw) adf images, because the length of each track is not fixed. The header contains information about the type and length of each track in the image, even if it's only partial. In order to merge two images you need to merge their headers as well. I have some python code which I've used successfully to merge two extended adfs, and even to replace tracks from one extended adf with tracks from another. The python code is an attachment to a post in this thread: http://eab.abime.net/showthread.php?t=41479

02 January 2010, 05:37	#7
Supamax Da Digger :) Join Date: Nov 2008 Location: Monza, Italy Posts: 2,822	Hi Redwood , I remember your posts . I don't understand python at all ... wouldn't it be possible to have your algorythm written in a more understandable language?

12 January 2010, 14:51	#8
Redwood Registered User Join Date: Jun 2008 Location: Sydney / Australia Posts: 83	You may be interested in the new "rawadf" tool: http://eab.abime.net/showthread.php?t=50160

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