hfs-user

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183 discussions

Writing to the Desktop Database
by Entwicklung 24 Jun '02

24 Jun '02

Hi, I am working on a project where I am required to create a Desktop Database. I have more then 100 files of the same type for which I would like to display the custom icon. I would like to know whether it is possible to display the the custom icon for a file by putting the relevant information in the Desktop Database. How can I set the creator, type, kind and icon data for the custom icon files by writing into the DTDB. Is there a flag called "hasDTDB" present and is it system defined. If so, where and how do we set it? I am coding in the "Windows platform" so I would not be able to user Mac routines. I am using a Mac to test whether my files are displaying the proper icons later. I would be thankful for any inputs in this regard. Thank you, Entwicklung.

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Structure of an ICN# Resource
by Entwicklung 21 Jun '02

21 Jun '02

Hi, I am trying to write an Icon-Extractor. Is there documentation available for the ICN# resource, regarding its structure and other relevant details.I would like to know how I can write Icon information into a file programmatically, once the Icon information has been extracted. TIA, Entwicklung

3 2

Adding to a Resource Fork of a File programmatically in Windows
by Entwicklung 20 Jun '02

20 Jun '02

Hi, I am working on a Project dealing with HFS and I need some help: Is it possible to display a custom icon for a normal document(not an application) - by writing the resource header, icon-list and resource map in the file's resource fork. If possible how do I do it in Windows(not in Mac)? What is the structure of a resource fork? How do I programmatically insert the resources into a file in Windows, so that the Icon resource is visible when viewed in a Mac. Entwicklung.

1 0

Displaying custom icon for a file
by Entwicklung 19 Jun '02

19 Jun '02

Hi, How do I add an Icon family to a file and see the Icon being displayed. What I tried is as follows: First add the icon family to a file using ResEdit "Use Custom icon" in the properties of the file is set. After saving the changes the Icon was still not displayed. Please help me out. Thanks In Advance

1 0

(no subject)
by Biswaroop(External) 14 May '02

14 May '02

Hi everybody, I want some help in finding a approximate value of the extents file. Let me describe it... I HAVE the following information -->> Total no. of directories present in the volume -->> Total no. of files with their full path and size in bytes. -->> The total amount of space needed for the data of those files. Problem faced :: Till now I used to find the total volume size first since i knew the size of each file. And then as in the Linux implementation they keep 1/128 th part of the Volume size as the size of the Catalog File The problem was when I used to select some directories for eg. DDK folder whose total size is around 58 MB and has around 4300 files in 300 directories. The Catalog file size decided upon the volume size would fill before all the entries were made and hence I would be left wtih an incomplete filesystem.I manipulated with different fiqures for the Catalog file size but it was more a hit and trial method.I know that Catalog File has information of the whole directory structure of the volume in a B* tree format. I also know at any given timeshot the B* tree will be around 2/3 rds full. I now know the size of the Catalog File depends actually on the no. of File and Directory entries rather than the full Volume size. So, can anybody give me a simple formula ( may be a good approximation) in trying to find out the Catalog File size needed for a given volume when I have the information as mentioned above. Such that the file size may be bigger than actually needed but not exceedingly big. In other words is there any way to find out the size from no. of Directory entries and file entriee??? Waitng for help . Bye Biswaroop God Created Earth. We made two worlds out of it! HEAVEN and HELL!!

1 0

To Calculate the size of Catalog File for creating a Readonly Filesystem
by Biswaroop(External) 13 May '02

13 May '02

Hi everybody, I want some help in finding a approximate value of the extents file. Let me describe it... I HAVE the following information -->> Total no. of directories present in the volume -->> Total no. of files with their full path and size in bytes. -->> The total amount of space needed for the data of those files. Problem faced :: Till now I used to find the total volume size first since i knew the size of each file. And then as in the Linux implementation they keep 1/128 th part of the Volume size as the size of the Catalog File. The problem was when I used to select some directories for eg. DDK folder whose total size is around 58 MB and has around 4300 files in 300 directories. The Catalog file size decided upon the volume size would fill before all the entries were made and hence I would be left wtih an incomplete filesystem. I manipulated with different fiqures for the Catalog file size but it was more a hit and trial method. I know that Catalog File has information of the whole directory structure of the volume in a B* tree format. I also know at any given timeshot the B* tree will be around 2/3 rds full. I now know the size of the Catalog File depends actually on the no. of File and Directory entries rather than the full Volume size. So, can anybody give me a simple formula ( may be a good approximation) in trying to find out the Catalog File size needed for a given volume when I have the information as mentioned above. Such that the file size may be bigger than actually needed but not exceedingly big. In other words is there any way to find out the size from no. of Directory entries and file entriee??? Waitng for help . Bye Biswaroop God Created Earth. We made two worlds out of it! HEAVEN and HELL!!

1 0

Re: hfsutils
by Entwicklung 08 May '02

08 May '02

Hi, Thanks for the reply. The problem is that I don't have any medium(disk) for such large images. I'm using Linux on an Intel PC and hfsutils since I can also specify a path to a directory. Upto 650MB I was using a normal CD. Manual mounting gives me the error 'not a block device' if I specify the path to the image. I also have no clue as to how I could write my image to a hard-disk perhaps starting at physical block 0. Maybe after that a manual mount would be possible.(?) But I guess that would probably be too tedious. Any other tips as to what I could possibly do ? Is there some application on the Mac which would allow me to mount the image-file as a volume ? ( maybe if I send it across from my PC to the Mac per FTP ) - I presume the Mac would see my file then as a regular file and not as an image of a volume right ? -Nandini ----- Original Message ----- From: "Don Brady" <brady(a)apple.com> To: "Entwicklung" <entwicklung(a)whengenibk.de> Sent: Monday, May 06, 2002 6:39 PM Subject: Re: hfsutils > What happens if you manually mount the disk? > (eg mount -t hfs /dev/disk3 /Volumes/xyz) > > hfs.util calls /sbin/mount, which in turn calls /sbin/mount_hfs > > -Don > Darwin File System Developer > > > On Monday, May 6, 2002, at 03:53 AM, Entwicklung wrote: > > > Hello, > > I'd like to know if anyone who has used hfsutils in the past > > knows > > upto what allocation block size it supports for reading. I have an > > allocation > > block size of 64kB and I'm unable to mount my hfs-volume. It is > > slightly > > larger than 2GB in size. Images of size 32MB, 64MB upto 512MB, 1GB > > and < 2GB > > seem to work fine. > > > > I get the following error : Sorry, unable to mount volume. Read > > unallocated > > block (Input/Output error). > > > > Does anybody know if hfsutils imposes a restriction on allocation block > > size > > or this error is due to some bug in my program ? What could possibly be > > causing this ? > > > > Regards, > > Nandini Hengen > > _______________________________________________ > > darwin-development mailing list | darwin-development(a)lists.apple.com > > Help/Unsubscribe/Archives: > > http://www.lists.apple.com/mailman/listinfo/darwin-development > > Do not post admin requests to the list. They will be ignored. >

1 0

hfsutils
by Entwicklung 07 May '02

07 May '02

Hello, I'd like to know if anyone who has used hfsutils in the past knows upto what allocation block size it supports for reading. I have an allocation block size of 64kB and I'm unable to mount my hfs-volume. It is slightly larger than 2GB in size. Images of size 32MB, 64MB upto 512MB, 1GB and < 2GB seem to work fine. I get the following error : Sorry, unable to mount volume. Read unallocated block (Input/Output error). Does anybody know if hfsutils imposes a restriction on allocation block size or this error is due to some bug in my program ? What could possibly be causing this ? Regards, Nandini Hengen

2 3

Wrapper and Readme
by Entwicklung 07 May '02

07 May '02

Hello Listers, Thanks to the friendly feedback I got I managed to get started off with including an HFS-Wrapper in my code. It seems to work ok now but I'm not too sure... I only have access to an iMac with MacOS 9 - my HFS+ Volume gets displayed but how do I get to verify if the ReadMe I'm creating in the Wrapper is ok ? The volume is recognized as an HFS+ Volume (since the embedded volume seems to be getting mounted directly) and I can do a GetInfo on it. Do I necessarily need an older Mac which doesn't support HFS+ to get to see the ReadMe ? I have one more question - Is it possible to have a Wrapper for HFS-volumes as well - embedding an HFS-volume within another HFS-Volume ? I guess this wouldn't have any benefits as such but theoretically it should be possible, right ? -Nandini ************************************************** The really bad thing about software is debugging it is a real nightmare when you weed one bug out then ten new ones will sprout 'til you get as mad as a march hare *****************************************************

3 6

Unwrapped HFS+ volumes
by Gordon Beatty 06 May '02

06 May '02

Hi all, Since people have asked questions about wrapped HFS+ volumes, I was reminded of a question I'd been meaning to ask. In general, by default, HFS+ volumes are created with the HFS wrapper for compatibility and are coded in the Partition Map with a type of 'Apple_HFS'. However, the potential exists for HFS+ volumes to exist on their own without the wrapper (especially where OS X is concerned -- or so I am led to believe). My question is simply, would such an unwrapped volume be coded in the Partition Map with the same type (Apple_HFS) or is there a type that exists specifically for this case? Gord Beatty

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