From 6ccc01d0b54fc775379c1a4e553ac5bdd7afc2fb Mon Sep 17 00:00:00 2001 From: Zachary Vance Date: Sat, 3 Aug 2024 14:48:28 -0400 Subject: [PATCH] Clean up permalinks out of comments --- ...lling-a-computercraft-turtle-remotely.html | 3 +- comments/ddos.html | 3 +- .../diy-keyboards-and-how-keyboards-work.html | 3 +- comments/hack-a-day-day-04-lashed-table.html | 3 +- ...alling-email-with-postfix-and-dovecot.html | 27 ++---- ...introducing-the-zorchpad-display-demo.html | 6 +- ...ng-a-hardware-random-number-generator.html | 6 +- comments/making-my-finances-public.html | 6 +- ...l-2270dw-printer-using-a-raspberry-pi.html | 30 +++---- comments/qr-backup.html | 9 +- ...ning-a-forge-server-on-headless-linux.html | 27 ++---- comments/steak-tartare-3.html | 3 +- ...ng-linux-twitch-using-ffmpeg-and-alsa.html | 3 +- .../terminal-goal-rationality-techniques.html | 3 +- ...ent-optimizers-satisficers-minimizers.html | 3 +- comments/tiny-cute-vampire-bat.html | 3 +- comments/understanding-gzip-2.html | 87 +++++++------------ comments/wip-dead-tree-publishing-4.html | 6 +- 18 files changed, 77 insertions(+), 154 deletions(-) diff --git a/comments/controlling-a-computercraft-turtle-remotely.html b/comments/controlling-a-computercraft-turtle-remotely.html index 5354eab..b0daa59 100644 --- a/comments/controlling-a-computercraft-turtle-remotely.html +++ b/comments/controlling-a-computercraft-turtle-remotely.html @@ -5,8 +5,7 @@
Alex Booth says:
-
- April 25, 2018 at 9:27 am
+
April 25, 2018 at 9:27 am

Opening up ComputerCraft to the world using the http commands was an amazing idea from the developers!

diff --git a/comments/ddos.html b/comments/ddos.html index 9d22dac..61946e4 100644 --- a/comments/ddos.html +++ b/comments/ddos.html @@ -5,8 +5,7 @@
Mircea Popescu says:
-
- September 2, 2017 at 6:23 pm
+
September 2, 2017 at 6:23 pm

Perhaps look into http://trilema.com/2015/mika-epstein-aka-ipstenu-is-a-thoroughly-clueless-poser/

diff --git a/comments/diy-keyboards-and-how-keyboards-work.html b/comments/diy-keyboards-and-how-keyboards-work.html index d5b8cba..c0669bc 100644 --- a/comments/diy-keyboards-and-how-keyboards-work.html +++ b/comments/diy-keyboards-and-how-keyboards-work.html @@ -5,8 +5,7 @@
nortti says:
-
- June 9, 2023 at 2:43 pm
+
June 9, 2023 at 2:43 pm

“And better keyboards can detect multiple keys being pressed at once (N-key rollover), which I think they do by having a completely separate wire to each key.”

You can keep a matrix arrangement and have N-key rollover by putting a diode in series with every switch

diff --git a/comments/hack-a-day-day-04-lashed-table.html b/comments/hack-a-day-day-04-lashed-table.html index 8f4198c..5162c6e 100644 --- a/comments/hack-a-day-day-04-lashed-table.html +++ b/comments/hack-a-day-day-04-lashed-table.html @@ -5,8 +5,7 @@
Carin says:
-
- November 6, 2023 at 8:44 am
+
November 6, 2023 at 8:44 am

Cool!

diff --git a/comments/installing-email-with-postfix-and-dovecot.html b/comments/installing-email-with-postfix-and-dovecot.html index b6b71a2..b209951 100644 --- a/comments/installing-email-with-postfix-and-dovecot.html +++ b/comments/installing-email-with-postfix-and-dovecot.html @@ -6,8 +6,7 @@
eduardz says:
-
- November 23, 2016 at 12:18 am
+
November 23, 2016 at 12:18 am

Hello,

Can you implement quota support from postgressql?

@@ -18,8 +17,7 @@
admin says:
-
- April 5, 2017 at 7:05 pm
+
April 5, 2017 at 7:05 pm

Not sure if this is “will you do” or “is it possible”. I will not do anything to set up quota–I have one user (me) so it doesn’t make sense. I encourage you to link if you do.

@@ -31,8 +29,7 @@
Tudor says:
-
- February 23, 2017 at 2:45 am
+
February 23, 2017 at 2:45 am

In the “useradd -d -M -d /var/mail/vmail –shell=/usr/bin/nologin -u 5000 -g vmail vmail“ I think the first “-d“ shouldn’t be there

Thanks for the post

@@ -43,8 +40,7 @@
admin says:
-
- April 5, 2017 at 7:06 pm
+
April 5, 2017 at 7:06 pm

Thanks for the corrections, glad you found it useful.

@@ -56,8 +52,7 @@
Tudor says:
-
- February 23, 2017 at 2:54 am
+
February 23, 2017 at 2:54 am

Also, for Postgresql the correct commands to create users are:
CREATE USER postfix PASSWORD ‘XXX’;
@@ -69,8 +64,7 @@ CREATE USER dovecot PASSWORD ‘XXX’;

Tudor says:
-
- February 23, 2017 at 3:22 am
+
February 23, 2017 at 3:22 am

Also, there shouldn’t be any comma after the VALUES (
‘za3k’,
@@ -83,8 +77,7 @@ CREATE USER dovecot PASSWORD ‘XXX’;

S says:
-
- May 12, 2018 at 9:36 am
+
May 12, 2018 at 9:36 am

A little sloppy – you should have simply shown the entire contents of each file one by one, with descriptions in comments or whatever, instead of breaking them up into snippets – and there are a few errors and omissions (I can’t recall which ones now)
However, using this guide and some googling, I was able to get a mailserver working – which is more than I can say for any other guide; so, thanks.

@@ -95,8 +88,7 @@ However, using this guide and some googling, I was able to get a mailserver work
Korilius says:
-
- July 17, 2021 at 3:56 pm
+
July 17, 2021 at 3:56 pm

A guide that could have been great but tripped at the finish line. A lot of errors in SQL and elsewhere along with step reorganization.

@@ -106,8 +98,7 @@ However, using this guide and some googling, I was able to get a mailserver work
admin says:
-
- July 17, 2021 at 4:52 pm
+
July 17, 2021 at 4:52 pm

If you have any specific errors you can mention, I’d be happy to fix stuff.

But yeah, that’s the problem with writing a guide after you do something instead of during/before.

diff --git a/comments/introducing-the-zorchpad-display-demo.html b/comments/introducing-the-zorchpad-display-demo.html index bbb3dcf..ad9b778 100644 --- a/comments/introducing-the-zorchpad-display-demo.html +++ b/comments/introducing-the-zorchpad-display-demo.html @@ -5,8 +5,7 @@
JenniferRM says:
-
- April 20, 2024 at 9:52 am
+
April 20, 2024 at 9:52 am

Very cool idea. I was imagining form factors, and was thinking briefly about somehow having a sort of laptop arrangement where an e-ink screen is visible through glass when it is closed and in some kind of “protective storage mode”, and then visible directly from “the proper side of the e-ink screen” after it opens up. This is probably impossible using default hardware options, but searching around to confirm this lead to some interesting links and unusual design demos.

Here’s ~12 year old thread from someone who wants a computer to use in an off grid cabin.
@@ -22,8 +21,7 @@

admin says:
-
- April 20, 2024 at 10:24 am
+
April 20, 2024 at 10:24 am

Try using numbers, instead of words! It works better for comparing power usage.

The “low-power computer” someone wants from 12 years ago should be 3W. The Zorchpad is designed to run at 0.001W.

diff --git a/comments/making-a-hardware-random-number-generator.html b/comments/making-a-hardware-random-number-generator.html index e9cbf44..28461fe 100644 --- a/comments/making-a-hardware-random-number-generator.html +++ b/comments/making-a-hardware-random-number-generator.html @@ -5,8 +5,7 @@
jiacheng hao says:
-
- March 3, 2024 at 9:04 pm
+
March 3, 2024 at 9:04 pm

Hello, I think you are truely right about the TRNG. I am a researcher who specializes in designing TRNG. And now I have a TRNG chip with PCB support USB2.0. And the speed can be up to 30Mbps. It can pass NIST 800-22 and 800-90B. Are you interested in that? Looking forward to your reply!!

@@ -16,8 +15,7 @@
admin says:
-
- March 3, 2024 at 11:36 pm
+
March 3, 2024 at 11:36 pm

Interested in what way?

Is your TRNG open-source?

diff --git a/comments/making-my-finances-public.html b/comments/making-my-finances-public.html index 04a09d4..144491d 100644 --- a/comments/making-my-finances-public.html +++ b/comments/making-my-finances-public.html @@ -5,8 +5,7 @@
anon says:
-
- February 7, 2019 at 6:19 am
+
February 7, 2019 at 6:19 am

is offline

@@ -16,8 +15,7 @@
admin says:
-
- December 17, 2019 at 7:41 pm
+
December 17, 2019 at 7:41 pm

Yeah, my export broke a while back. This should be fixed indefinitely, but covers 2011-2016 only now.

diff --git a/comments/printing-on-the-brother-hl-2270dw-printer-using-a-raspberry-pi.html b/comments/printing-on-the-brother-hl-2270dw-printer-using-a-raspberry-pi.html index bf91c20..5a32025 100644 --- a/comments/printing-on-the-brother-hl-2270dw-printer-using-a-raspberry-pi.html +++ b/comments/printing-on-the-brother-hl-2270dw-printer-using-a-raspberry-pi.html @@ -5,8 +5,7 @@
Joel says:
-
- August 2, 2020 at 12:52 pm
+
August 2, 2020 at 12:52 pm

There appears to be a typo in step 5A. The page currently reads “lpinfo -m” but I believe should be “lpinfo -v”. Per the man page, the m flag lists drivers and the v flag lists devices.

The USB device can be found in the -v output for step 5A but the driver can be found in the -m output for step 5B.

@@ -17,8 +16,7 @@
Scott says:
-
- October 19, 2020 at 5:10 pm
+
October 19, 2020 at 5:10 pm

Thank you so very much for this. Worked like a charm.

Any tips on how to print over the network?

@@ -29,8 +27,7 @@
rathesun01 says:
-
- December 8, 2020 at 6:44 pm
+
December 8, 2020 at 6:44 pm

Awesome post. Joel is supposedly correct. It should have been “lpinfo -v” in the step 5A.

@@ -40,8 +37,7 @@
admin says:
-
- December 12, 2020 at 1:31 pm
+
December 12, 2020 at 1:31 pm

Corrected ‘lpinfo -v’, thanks.
No clue how to print over the network, sorry. That’s actually why I set up a raspberry pi to connect to the printer instead–it’s my wifi interface.

@@ -52,8 +48,7 @@ No clue how to print over the network, sorry. That’s actually why I set up a r
steve says:
-
- December 30, 2020 at 9:05 am
+
December 30, 2020 at 9:05 am

I have the Brother HL-2270DW, and I had to install from source to get it to work. I’m not using USB, but port forwarding across via NAT to another internal network.

I just used the cups admin pages to complete setting things up. Before using this package, I picked some other closely related printer. It was printing the page, sucking it back in, then finally printing. Not terrible, but I was annoyed. Now it’s perfect!

@@ -66,8 +61,7 @@ No clue how to print over the network, sorry. That’s actually why I set up a r
Jaye Horn says:
-
- February 18, 2021 at 3:19 pm
+
February 18, 2021 at 3:19 pm

How did you install from source? and how did you do the port forwarding across via NAT to another internal network? I’m new to this so any help would be very much appreciated.

Thank you.

@@ -80,8 +74,7 @@ No clue how to print over the network, sorry. That’s actually why I set up a r
Job says:
-
- January 20, 2021 at 8:09 pm
+
January 20, 2021 at 8:09 pm

Would this work for brother hl-l2395dw scanner?

@@ -91,8 +84,7 @@ No clue how to print over the network, sorry. That’s actually why I set up a r
Adam Trask says:
-
- October 22, 2021 at 5:00 am
+
October 22, 2021 at 5:00 am

Thanks so much for posting this. This helped get my HL-L2300D working properly.

@@ -102,8 +94,7 @@ No clue how to print over the network, sorry. That’s actually why I set up a r
Danial Foster says:
-
- December 24, 2021 at 1:39 am
+
December 24, 2021 at 1:39 am

>>> (author’s shameful note: if you’re not looking, I find it
>>>surprisingly easy to plug USB B into the ethernet jack)

@@ -118,8 +109,7 @@ No clue how to print over the network, sorry. That’s actually why I set up a r
J Bot says:
-
- January 3, 2023 at 4:03 pm
+
January 3, 2023 at 4:03 pm

Any steps to do this with a wifi connected HL-2270DW? Thanks!

diff --git a/comments/qr-backup.html b/comments/qr-backup.html index 29015c0..673aadd 100644 --- a/comments/qr-backup.html +++ b/comments/qr-backup.html @@ -5,8 +5,7 @@
scruss says:
-
- June 9, 2021 at 6:58 am
+
June 9, 2021 at 6:58 am

nice! I’ve played with some similar ideas, using tar and QR Code output to a thermal printer. The used to be a thing (Twibright Optar, IIRC: it’s fallen off the web) that made full-page scannable codes that got an almost useful data density. But they weren’t QR Codes, so needed their own decoder.

@@ -16,8 +15,7 @@
admin says:
-
- June 9, 2021 at 2:06 pm
+
June 9, 2021 at 2:06 pm

Actually, I link to it in the FAQ, it’s still on the web. An even better version was “Paperback”, but it’s 9 years unmaintained–I’m looking into seeing if there is a maintained Linux port. Both do a lot of things right, even if they have a slightly different goal (high data density, over ease-of-use and foolproof restore).

@@ -27,8 +25,7 @@
admin says:
-
- June 9, 2021 at 2:08 pm
+
June 9, 2021 at 2:08 pm

Also, feel free to recommend me a good, cheap thermal printer. I tried to do a “poloroid” thing (take a picture of yourself with webcam, immediately print to thermal) and found that mine was shit and the heat overexposed unrelated parts. QR codes seem like a reasonable application, although I’d be concerned about the longevity of thermal paper for backups (can easily fade in heat).

Edit: If I remember correctly, I wanted to make a thermal-paper typewriter for a zine?

diff --git a/comments/running-a-forge-server-on-headless-linux.html b/comments/running-a-forge-server-on-headless-linux.html index a4a4cb8..c97f6e8 100644 --- a/comments/running-a-forge-server-on-headless-linux.html +++ b/comments/running-a-forge-server-on-headless-linux.html @@ -5,8 +5,7 @@
Susan Tatun says:
-
- July 10, 2015 at 11:31 pm
+
July 10, 2015 at 11:31 pm

An honest sharing about downloaing and installing Minecraft 1.6.4. I followed what you mentioned and did it sucessfully. Right now, I’m playing with my little son and guiding him what the terrific things are. Anyway, thanks a lot!

@@ -16,8 +15,7 @@
Lynx says:
-
- August 18, 2015 at 1:44 am
+
August 18, 2015 at 1:44 am

4am installs of servers is hard, and trying to follow the Forge wiki which is inaccurate at best is hard.
You got me from dead brick to running box in ten minutes. Thank you.

@@ -28,8 +26,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

crumpuppet says:
-
- September 7, 2015 at 1:32 pm
+
September 7, 2015 at 1:32 pm

Thanks so much! I’ve been looking for these steps for a while, and finally found something that works. Would have been first prize if it could be used along with a GUI frontend like mcmyadmin, but oh well 🙂

@@ -39,8 +36,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

Dave says:
-
- November 9, 2015 at 11:14 am
+
November 9, 2015 at 11:14 am

Same here. Searched all over found yours and running in moments. My kids have been hooked on mods and wanted a server. I have VMware and can spin up a linux box up in moments. This was so easy. Thanks.

@@ -50,8 +46,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

Minecraft Lover says:
-
- February 6, 2019 at 6:40 am
+
February 6, 2019 at 6:40 am

Very useful information, Thank you

@@ -61,8 +56,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

Leon says:
-
- September 9, 2019 at 9:12 am
+
September 9, 2019 at 9:12 am

Does anyone here have problems with installing the mods. Im donwloading them in the mods directory with the cmd “wget” and nothing works.Am i using the wrong command or what?

@@ -72,8 +66,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

Rajan Chopra says:
-
- March 7, 2020 at 3:45 pm
+
March 7, 2020 at 3:45 pm

Thanks for sharing Minecraft. Can you also share Roblox Apk?

@@ -83,8 +76,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

Neckbeard Hater says:
-
- January 4, 2021 at 10:22 pm
+
January 4, 2021 at 10:22 pm

“one of the devs seems actively hostile around providing help to …”

this is so typical of the linux community. really. And I am a developer with 20 years experience, I hate the Linux community.

@@ -95,8 +87,7 @@ You got me from dead brick to running box in ten minutes. Thank you.

nat says:
-
- February 14, 2023 at 9:17 am
+
February 14, 2023 at 9:17 am

lol this tutorial still works 9 years later thanks tho this helped so much!!

diff --git a/comments/steak-tartare-3.html b/comments/steak-tartare-3.html index 189c21f..4a07042 100644 --- a/comments/steak-tartare-3.html +++ b/comments/steak-tartare-3.html @@ -5,8 +5,7 @@
Tricia says:
-
- May 21, 2015 at 8:14 pm
+
May 21, 2015 at 8:14 pm

So tasty! Enjoyed our month of obsessing over the recipe ^u^

diff --git a/comments/streaming-linux-twitch-using-ffmpeg-and-alsa.html b/comments/streaming-linux-twitch-using-ffmpeg-and-alsa.html index 8f478e0..deb04e7 100644 --- a/comments/streaming-linux-twitch-using-ffmpeg-and-alsa.html +++ b/comments/streaming-linux-twitch-using-ffmpeg-and-alsa.html @@ -5,8 +5,7 @@
Mario Enriquez says:
-
- January 22, 2021 at 7:31 pm
+
January 22, 2021 at 7:31 pm

Thanks for your post.

diff --git a/comments/terminal-goal-rationality-techniques.html b/comments/terminal-goal-rationality-techniques.html index 27a2980..e2d1c3e 100644 --- a/comments/terminal-goal-rationality-techniques.html +++ b/comments/terminal-goal-rationality-techniques.html @@ -5,8 +5,7 @@
JSevilla says:
-
- July 18, 2015 at 9:42 pm
+
July 18, 2015 at 9:42 pm

Cool stuff. I liked exactboxing and DTOT.
Murphy jitsu has potential.
diff --git a/comments/time-management-optimizers-satisficers-minimizers.html b/comments/time-management-optimizers-satisficers-minimizers.html index 89c1a0a..a4b00a3 100644 --- a/comments/time-management-optimizers-satisficers-minimizers.html +++ b/comments/time-management-optimizers-satisficers-minimizers.html @@ -5,8 +5,7 @@

Tricia says:
-
- November 5, 2015 at 9:13 pm
+
November 5, 2015 at 9:13 pm

Very nice! I often find myself automatically optimizing – the easiest place to see this is in Animal Crossing where I’ll keep a large cash of items for when villagers might ask for one. The idea is to always be prepared (I blame girl scouts). I suppose the negative to this behavior is that it could lead to hording if left unchecked.

diff --git a/comments/tiny-cute-vampire-bat.html b/comments/tiny-cute-vampire-bat.html index 7dfa06c..907b9ce 100644 --- a/comments/tiny-cute-vampire-bat.html +++ b/comments/tiny-cute-vampire-bat.html @@ -5,8 +5,7 @@
Tricia says:
-
- October 14, 2015 at 10:03 am
+
October 14, 2015 at 10:03 am

Hola! Just wanted to let you know I nominated you for the Versatile Blogger Award, for more info check out my post here: http://sometimesicook.net/2015/10/14/the-versatile-blogger-award/ 😀

diff --git a/comments/understanding-gzip-2.html b/comments/understanding-gzip-2.html index eb5a3ea..9eb22aa 100644 --- a/comments/understanding-gzip-2.html +++ b/comments/understanding-gzip-2.html @@ -5,8 +5,7 @@
Lee says:
-
- July 23, 2021 at 1:47 pm
+
July 23, 2021 at 1:47 pm

“Now we assign a binary codewords of length N, to each length N in the list.
1:1100,2:0,4:1101,16:1110,17:1111,18:10”

@@ -18,8 +17,7 @@
admin says:
-
- July 23, 2021 at 2:04 pm
+
July 23, 2021 at 2:04 pm

This is what “Aside: Storing Prefix-Free Codewords as a List of Lengths” is about. The algorithm is given in full in RFC 1952 if you’re interested. Basically, the code words are assigned starting from 0 (or 00, 000, etc) and counting up. As each code is assigned, anything with that code as a prefix becomes unavailable. They are assigned first from shortest to longest, and in the case of ties from leftmost in the list to rightmost in the list.

So first we assign 0 to the length-1 codeword (0 is lower than 1), then we assign the length-2 codeword 10 (the lowest length-2 code that doesn’t have a prefix 0), and finally we assign the length-4 codewords from left to right (1100, 1101, 1110, 1111 don’t have a prefix of 0 or 10 — they are the lowest and only codewords without one of those prefixes).

@@ -31,8 +29,7 @@
Lee says:
-
- July 23, 2021 at 3:23 pm
+
July 23, 2021 at 3:23 pm

I think I get it now, as soon as I resolve some compile errors I’m gonna try this:

“`
@@ -59,8 +56,7 @@

Lee says:
-
- July 25, 2021 at 12:06 pm
+
July 25, 2021 at 12:06 pm

Took me a while to understand that I was supposed to be building the tree at this point (although this method compared to what I though of and implemented prior to this is inefficient both in space and speed, also terribly um-intuitive). I’m having trouble understanding exactly how to extract some literals you’ve mentioned:

“Byte 18-19: 0000001 10 0110101. Copy “0” code length 11-138 times
@@ -78,8 +74,7 @@ Byte 21-22: 111111 10 0001000 1. Copy “0” code length 11-138 times. 0b000100

admin says:
-
- July 25, 2021 at 12:27 pm
+
July 25, 2021 at 12:27 pm

I’m glad this was helpful, but you should really go read RFC 1951 if you’re going to build a decoder. This isn’t meant to be a stand-alone guide.

I’m pretty lost trying to follow this comment, sorry. To clarify, for the “dynamic” compression, you first extract the CODING TABLE for the literals (the step you’re talking about). Then, you use the coding table to decompress the actual stream of content. It’s a two-step process, which is why it’s so complex.

@@ -91,8 +86,7 @@ Byte 21-22: 111111 10 0001000 1. Copy “0” code length 11-138 times. 0b000100
Lee says:
-
- July 25, 2021 at 1:41 pm
+
July 25, 2021 at 1:41 pm

Was gonna say I already had the code table but when it printed it seems the codes got corrupted, I’ll have to get back to you after fixing it. Anyways I find “guides” that don’t use real examples as this one does to be confusing sometimes, usually where it matters, that’s why I was consulting you who provided those key examples, I got a heck of a lot further with your guide than any other I’ve tried following which didn’t give the byte by byte, bit by bit example.

@@ -102,8 +96,7 @@ Byte 21-22: 111111 10 0001000 1. Copy “0” code length 11-138 times. 0b000100
Lee says:
-
- July 25, 2021 at 1:50 pm
+
July 25, 2021 at 1:50 pm

Turned out I was just printing the wrong value, here’s my current output:

`
@@ -198,8 +191,7 @@ PrintBytes( 0x556653fbf4a0, 0, 16 )

Lee says:
-
- July 25, 2021 at 3:32 pm
+
July 25, 2021 at 3:32 pm

Never min, I think I know where the literals are coming from now, I did this:


@@ -223,8 +215,7 @@ printf( "num as a character = '%c'\n", num );

Lee says:
-
- July 26, 2021 at 7:46 am
+
July 26, 2021 at 7:46 am

I think I still misunderstood something somewhere, I’ve done a detailed post on the section I think I’ve mis-interpreted here:

https://cboard.cprogramming.com/c-programming/180462-increment-gone-wrong.html#post1302477

@@ -236,8 +227,7 @@ printf( "num as a character = '%c'\n", num );
admin says:
-
- July 26, 2021 at 8:54 am
+
July 26, 2021 at 8:54 am

Sorry, I don’t really want to help someone else debug code or output. I’d suggest following the links at the start of the blog article. Check out ‘infgen’ in particular.

@@ -247,8 +237,7 @@ printf( "num as a character = '%c'\n", num );
Lee says:
-
- July 26, 2021 at 9:34 am
+
July 26, 2021 at 9:34 am

I originally gave up on infgen due to an access rights error when I tried installing via the package manager, the server refused to let me download it, then after your last comment I though to look for it’s github page, that one worked out fine, judging by it’s output the only thing I’ve got wrong are the length values for the distance symbols/codes/whatever you want to call them, where do you get that 2 from? same applies to the bit code along side them, where does that come from, is it just an iterated number for each valid symbol?

@@ -258,8 +247,7 @@ printf( "num as a character = '%c'\n", num );
admin says:
-
- July 26, 2021 at 10:56 am
+
July 26, 2021 at 10:56 am

You read 267=260+7 codeword-lengths (the numbers 260 and 7 are given by bytes 10-12 in this example).

The first 260 codeword-lengths are used for one huffman table: 256 literals (always 256), then 1 “end of block” (always 2), then the remaining 3 are lengths.

@@ -271,8 +259,7 @@ printf( "num as a character = '%c'\n", num );
Lee says:
-
- July 26, 2021 at 11:50 am
+
July 26, 2021 at 11:50 am

Even if I use the same method of code generation as before I stiil would need to know where you got those “2”s from in the table immediately following this:

“We read 7 numbers, that’s the whole distances table. Assign the “standard” binary codewords to generate the following table:”

@@ -285,8 +272,7 @@ printf( "num as a character = '%c'\n", num );
admin says:
-
- July 26, 2021 at 12:23 pm
+
July 26, 2021 at 12:23 pm

Re-read above the table. The “bits” column is from bytes 24-25.

@@ -305,8 +291,7 @@ printf( "num as a character = '%c'\n", num );
Lee says:
-
- July 26, 2021 at 12:43 pm
+
July 26, 2021 at 12:43 pm

No option to reply so I’ll do it here instead, I still don’t see where the 2 came from, is that a minimum length or from another hard code table? So far I can only see the bits given as a set/unset symbol & code flag, there’s no clear source for the length & extra bits values

@@ -316,8 +301,7 @@ printf( "num as a character = '%c'\n", num );
Lee says:
-
- July 26, 2021 at 5:54 pm
+
July 26, 2021 at 5:54 pm

Finally found where you got the 2 from:

https://www.w3.org/Graphics/PNG/RFC-1951

@@ -334,8 +318,7 @@ printf( "num as a character = '%c'\n", num );
Lee says:
-
- July 31, 2021 at 11:29 am
+
July 31, 2021 at 11:29 am

I’ve clearly misunderstood something somewhere, could you take a look at the code I outlined in the below post please and see if you can spot what I’m misunderstanding, up until the point I have to lookup previously deflated values I’ve read the bits correctly but I’ve obviously not understood all the implied information correctly, I would post the code here but as you’ve seen these comments don’t support maintaining the code formatting resulting in a more confusing than necessary code.

https://cboard.cprogramming.com/c-programming/180462-increment-gone-wrong-post1302541.html#post1302541

@@ -346,8 +329,7 @@ printf( "num as a character = '%c'\n", num );
Lee says:
-
- August 2, 2021 at 5:36 pm
+
August 2, 2021 at 5:36 pm

You’ll be glad to know I finally got the algorithm right, have not looked at any source code from zlib or other projects so I’m free to slap MIT License on it the whole way through once I convert it to a cleaner version of itself. The unclean version is here for anyone’s reference.

https://gitlab.com/awsdert/uc-evidence/-/tree/9441a73e59834456c41c1049036fc60925b705a0

@@ -360,8 +342,7 @@ printf( "num as a character = '%c'\n", num );
neubert says:
-
- December 21, 2021 at 1:00 am
+
December 21, 2021 at 1:00 am

From the Fixed huffman coding section:

“Byte 10-11: 110 10011000 10010: A literal. 10011000 (152) minus 00110000 (48) is 104. 104 in ASCII is ‘h’.”

@@ -373,8 +354,7 @@ printf( "num as a character = '%c'\n", num );
admin says:
-
- December 21, 2021 at 1:11 am
+
December 21, 2021 at 1:11 am

The binary range (given above) is 00110000-10111111. Rather than decoding the binary value, we decode the offset within that range.

@@ -386,8 +366,7 @@ printf( "num as a character = '%c'\n", num );
neubert says:
-
- December 22, 2021 at 7:27 am
+
December 22, 2021 at 7:27 am

“Now we assign a binary codewords of length N, to each length N in the list.
1:1100,2:0,4:1101,16:1110,17:1111,18:10”

@@ -401,8 +380,7 @@ printf( "num as a character = '%c'\n", num );
neubert says:
-
- December 22, 2021 at 10:49 pm
+
December 22, 2021 at 10:49 pm

I figured it out. It’s this bit from RFC1951:


@@ -437,8 +415,7 @@ printf( "num as a character = '%c'\n", num );

neubert says:
-
- December 24, 2021 at 10:38 pm
+
December 24, 2021 at 10:38 pm

““Literals” 257-259 (all lengths) have codewords of length 4” Is this a hard and fast rule that’s always true regardless of the data or is this true _just_ for the compressed string in this example?

@@ -448,8 +425,7 @@ printf( "num as a character = '%c'\n", num );
admin says:
-
- December 25, 2021 at 2:25 pm
+
December 25, 2021 at 2:25 pm

Just for the example. If it was always true, we wouldn’t have to encode it.

@@ -461,8 +437,7 @@ printf( "num as a character = '%c'\n", num );
neubert says:
-
- December 27, 2021 at 12:54 am
+
December 27, 2021 at 12:54 am

“Byte 27: 1110 10 0 1. Length 4. Whenever we read a length, we read a distance. The distance is a range, 7-8. The extra bit we read is 0b0=0, plus 7 is Distance 7. So we look back 7 bytes and copy 4. The new output is: baabbbabaab”

I think there should be an extra a before the baabbbabaab

@@ -473,8 +448,7 @@ printf( "num as a character = '%c'\n", num );
inco says:
-
- June 22, 2022 at 1:56 pm
+
June 22, 2022 at 1:56 pm

I’ve been reading quite a bit on DEFLATE in png files and I think this is the exact level of depth i needed to crack this whole mess. Thanks so much for writing this, sources like RFC1951 talk more about abstraction and general rules but to have a few examples lined out here its EXTREMELY useful. Thanks again

@@ -484,8 +458,7 @@ printf( "num as a character = '%c'\n", num );
inco says:
-
- June 22, 2022 at 3:38 pm
+
June 22, 2022 at 3:38 pm

Small question about reading bits: for Huffman codes of the code itself defines a length range and then the extra bits are reversed so that they can be interpreted. But should I reverse the distance or the distance extra bits as well?

@@ -497,8 +470,7 @@ printf( "num as a character = '%c'\n", num );
Ricardo says:
-
- May 31, 2024 at 4:32 am
+
May 31, 2024 at 4:32 am

Byte 31: 10 111000: Literal ‘b’
Byte 31: 10 1110 00: Length 4, Distance 1. We look back 1 byte and copy 4. The new output is: bbbbb

@@ -512,8 +484,7 @@ Should I repeat the ‘b’ four times?

admin says:
-
- May 31, 2024 at 5:23 pm
+
May 31, 2024 at 5:23 pm

Distance is how far back you start. Copy is how many symbols you copy.
You just blindly copy characters starting DISTANCE back, but since you’re appending to the string, you never run out of symbols to copy.

diff --git a/comments/wip-dead-tree-publishing-4.html b/comments/wip-dead-tree-publishing-4.html index 6e769b8..3191ff4 100644 --- a/comments/wip-dead-tree-publishing-4.html +++ b/comments/wip-dead-tree-publishing-4.html @@ -5,8 +5,7 @@
TheTechRobo says:
-
- April 23, 2022 at 5:46 pm
+
April 23, 2022 at 5:46 pm

Out of curiosity, why did you stop the service?

@@ -16,8 +15,7 @@
admin says:
-
- April 24, 2022 at 9:39 am
+
April 24, 2022 at 9:39 am

This was launched in 2015, and you’re the first person to ask me about the the service since. That should give you an idea of the popularity. I’m very bad at marketing, to be fair, so it’s not totally clear that means the service was undesirable.

So when I eventually ran into some problem with active maintenance (the site needed updating to keep working, or something of that kind), I just didn’t.

-- 2.47.3