The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for 2021

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The Delphi Open Tools API Book 1.1 – Dave’s Development Blog

Posted by jpluimers on 2021/10/07

[WayBack] The Delphi Open Tools API Book 1.1 – Dave’s Development Blog

–jeroen

Posted in Delphi, Development, Software Development | Leave a Comment »

T-Shirt quotes on threading and procastrination

Posted by jpluimers on 2021/10/07

–jeroen

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Posted in Development, Fun, LifeHacker, Power User, Quotes, Software Development, T-Shirt quotes | Leave a Comment »

More on empty files

Posted by jpluimers on 2021/10/07

TL;DR: Empty files are indeed of size zero, but there is some disk space involved for their meta-data (like name, permission, timestamps)

Some links (via [WayBack] create zero sized file – Google Search):

  • [WayBack] Zero-byte file – Wikipedia
  • [WayBack] filesystems – How can a file size be zero? – Super User (thanks [WayBack] phuclv):

    Filesystems store a lot of information about a file such as file name, file size, creation time, access time, modified time, created user, user and group permissions, fragments, pointer to clusters that store the file, hard/soft links, attributes… Those are called file metadata. Why do you count those metadata into file size when users do not (need to) care about them and don’t know about them? They only really care about the file content

    Moreover each filesystem stores different types of metadata which take different amounts of space on disk. For example POSIX permissions are very different from NTFS permission, and there are also inode numbers in POSIX which do not exist on Windows. Even POSIX filesystems vary a lot, like ext3 with 32-bit block address, ext4 with 48-bit, Btrfs with 64-bit and ZFS with 128-bit address. So how will you count those metadata into file size?

    Take another example with a 100-byte file whose metadata consumes 56 bytes on the current filesystem. We copy the file to another filesystem and now it takes 128 bytes of metadata. However the file contents are exactly the same, the number of bytes in the files are also the same. So displaying file size as 156 bytes on a system but 228 bytes on another is very confusing and counter-intuitive.

  • [WayBack] What is the concept of creating a file with zero bytes in Linux? – Unix & Linux Stack Exchange:

    touch will create an inode, and ls -i or stat will show info about the inode:

    $ touch test
$ ls -i test
28971114 test
$ stat test
  File: ‘test’
  Size: 0           Blocks: 0          IO Block: 4096   regular empty file
Device: fc01h/64513d    Inode: 28971114    Links: 1
Access: (0664/-rw-rw-r--)  Uid: ( 1000/1000)   Gid: ( 1000/1000)
Access: 2017-03-28 17:38:07.221131925 +0200
Modify: 2017-03-28 17:38:07.221131925 +0200
Change: 2017-03-28 17:38:07.221131925 +0200
 Birth: -

    Notice that test uses 0 blocks. To store the data displayed, the inode uses some bytes. Those bytes are stored in the inode table. Look at the ext2 page for an example of an inode structure [WayBack].

Oh and a nice NTFS thing (thanks [WayBack] Paweł Bulwan):

and in case of NTFS, the size of file reported by Windows and most tools is actually the size of the main stream of the file, which we perceive as the content of the file. The file stored on NTFS partition can additionaly have some data stored in alternative data streams, and still have the reported size of 0. It’s a nice filesystem feature to know if you want to have the full picture :)

Related: my really old post command line – create empty text file from a batch file (via: Stack Overflow)

–jeroen

Posted in *nix, btrfs, Development, File-Systems, NTFS, Power User, Software Development, Windows | Leave a Comment »

Teams, hats and colours

Posted by jpluimers on 2021/10/06

I learned a few new things a while ago, but still have a hard time to get the association between colours and meanings right.

Colours:

  • white: friendly / sanctioned / by permission
  • black: enemy / unsanctioned
  • red: attacks by permission
  • blue: defends by permission

Based on these tweets and links:

 

–jeroen

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Posted in Development, LifeHacker, Power User, Security, Software Development | Leave a Comment »

For WiFi guest networks with a fixed SSID: QR code – Wikipedia

Posted by jpluimers on 2021/10/06

Access Denied

Access Denied

I knew it was possible to generate QR codes to access quest networks (as the QR code has credentials) for WiFi networks having a fixed SSID.

I just never bothered, but did when needed home care with quite a few different people providing the care.

Generating was easier than I anticipated, though I hoped I just could put the parameters in a URL and fire off to get a page including the QR code.

Alas, the pages I found require you to enter the SSID name and key/password phrase.

That’s OK: I have saved the PNG files for our network and my brother’s as images so I can put them on-line, and printed them out so guests can scan and use the network at once.

Here we go:

  • 124 network Access Denied, key 2171TB24
  • 171 network Disconnected, key 1060NP71

Related:

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Posted in Barcode, Development, Fritz!, Fritz!Box, JavaScript/ECMAScript, Network-and-equipment, Power User, QR code, Scripting, Software Development, Web Development, WiFi | Leave a Comment »

Highly esteemed science: An analysis of attitudes towards and perceived attributes of science in letters to the editor in two Dutch newspapers – Stefan P.L. de Jong, Elena Ketting, Leonie van Drooge, 2020

Posted by jpluimers on 2021/10/06

All my IPv4 addresses seem to be blocked with messages like this (note the odd, but allowed, leading zero in the IPv4 address [WayBack]):

Error

The IP you are accessing the site with (037.153.243.242) has been blocked because it has triggered one of our security measures. Please see the reason below:
Block reason: This IP was identified as infiltrated and is being used by sci-hub as a proxy.
To restore access, please contact onlinesupport@sagepub.com citing this message in full.

A quick [WayBack] “This IP was identified as infiltrated and is being used by sci-hub as a proxy.” – Google Search shows they also block the Google Bot.

I am not not even going to bother with companies that have bad infiltration detection.

Of course I ensured the paper has been archived:

[WayBack/Archive.is] Highly esteemed science: An analysis of attitudes towards and perceived attributes of science in letters to the editor in two Dutch newspapers – Stefan P.L. de Jong, Elena Ketting, Leonie van Drooge, 2020.

Note I do not run sci-hub, though it tempts me doing so. For more info: [WayBack] Sci-Hub – Wikipedia

I checked the router and web-proxy for any suspicious activity. There is none.

I do run the ArchiveBot by the ArchiveTeam to support the WayBackMachine of the InternetArchive and the great team Mark Graham has there providing some bandwidth and CPU/memory resources helping them archive public internet content for posterity.

It that triggers SAGE, too bad for them.

–jeroen

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Posted in Development, Internet, InternetArchive, LifeHacker, Power User, Software Development, WayBack machine, Web Development | Leave a Comment »

The browser wars that started on iOS (forcing Safari) and Android (forcing Chrome) now are continued on Windows 11 (forcing Edge)

Posted by jpluimers on 2021/10/05

Via:

 

Posted in Awareness, Development, HTTP, Internet protocol suite, Software Development, TCP, TLS, URI, Web Development | Leave a Comment »

Google Maps Hacks by Simon Weckert – YouTube

Posted by jpluimers on 2021/10/05

This is from almost 2 years back, so I wonder if the physical and virtual Google Maps spoofing still works.

Via:

–jeroen

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Posted in Android, Development, Google, GoogleMaps, Mobile Development, Power User, Software Development | Leave a Comment »

Naughty naughty no alt: CSS style to clearly show which images lack an alt-text

Posted by jpluimers on 2021/10/05

The CSS from [WayBack/Archive.is] Naughty naughty no alt that shows the below red moving rendering of images that do not have an alt-text is simple:

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Posted in Bookmarklet, CSS, Development, HTML, HTML5, Power User, Software Development, Web Browsers, Web Development | Leave a Comment »

UniFi USG link dump

Posted by jpluimers on 2021/10/04

I wanted to setup a UniFi USG (Ubiquiti Unifi Security Gateway) with round robin multi-WAN and incoming port forwarding on both WAN connections.

Quite a few links were the result:

Adoption was another headache. Some links on that too:

If you end up in a cannot adopt state, then a reset is the only practical way to go:

–jeroen

Posted in Network-and-equipment, Power User, Unifi-Ubiquiti, USG Ubiquiti Unifi Security Gateway | Leave a Comment »

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