Cody Boone Ferguson
9e456b4750
In particular the following diff for each README.md (with all the
index.html files rebuilt):
-Watch the following [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse) YouTube show:
+Watch the [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse)
+YouTube show for this entry:
118 lines
3.6 KiB
Markdown
118 lines
3.6 KiB
Markdown
## Award presentation:
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Watch the [Our Favorite Universe](https://www.youtube.com/@OurFavoriteUniverse)
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YouTube show for this entry:
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> [IOCCC28 - 2024/stedolan - Best one liner](https://www.youtube.com/watch?v=NJ-e4SgXGpw)
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## To build:
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``` <!---sh-->
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make all
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```
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## To use:
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``` <!---sh-->
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echo {10-hex-digits} | ./prog > out.pbm
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```
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## Try:
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``` <!---sh-->
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md5sum prog.c | ./prog | display -
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```
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## Judges' remarks:
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There are no magic numbers in the program, and bits of the input map to pixels of the output
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in a regular way, yet it outputs a nice icon for itself, if given the MD5 hash of its own source. How?
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## Author's remarks:
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This program is a decoder for a very compact icon format, producing 80x80
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pixel **pbm images** based on small bitmapped icons:
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``` <!---sh-->
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echo faf6bdafe6 | ./prog | display - # calendar
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echo f843928fe0 | ./prog | display - # mail
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echo f0b42d0bd8 | ./prog | display - # battery
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echo f39ce33bc0 | ./prog | display - # 1
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echo f0aced1bc0 | ./prog | display - # 2
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echo f1b4ed1bc0 | ./prog | display - # 3
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echo 4010881098 | ./prog | display - # ?
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echo c6018c7398 | ./prog | display - # !
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echo de848d2c3c | ./prog | display - # the tetrominos
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```
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**NOTE**: The use of `| display -` is optional. If omitted,
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just view the resulting output in a terminal with a small font size.
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**NOTE**: Else if do not have ImageMagick's `display(1)` tool installed
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the use **pbm image** viewing tool of your choice.
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Effort has been made to reduce the size of the program text to a single
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longish line (135 characters, including newline). Regrettably, this left no
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space in which to store the program's own icon, a picture of a computer
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screen displaying 'C'.
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Accordingly, the program's icon is instead stored in the program's MD5 hash:
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``` <!---sh-->
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md5sum prog.c | ./prog | display -
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```
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**NOTE**: On machines without `md5sum(1)`, try `md5` or `openssl md5 -r`.
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### Notes
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- While terseness was preferred over obscurity, this program hopefully
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still lives down to IOCCC's usual standards of clarity.
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The program should be readable to any C programmer familiar with its
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less common operators, including French-quoted literals (`<<5>>`), the
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interrobang (`?!`) and the wink (`^-`).
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- To fit on one line, the program commits two anachronistic sins: it
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assumes an implicit `int` return type for `main`, and it uses several
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stdlib functions without including the relevant header.
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It can be compiled by switching to `-std=c89` (remembering a time when
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such crimes were let off with a warning), or by covering up the crimes
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with `-Dmain='int main' -include stdio.h`, at which point it is valid
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under any version of C.
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- Even with these compiler options, Clang and GCC with `-Wall` also issue
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a warning complaining that the program correctly uses weird parts of
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the C operator precedence table. No apology is made for this one.
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- Several variants of this program were considered. Several.
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- The icon format is compressed, not just bit-packed: there are more
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pixels in the output than bits in the input.
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- By an astonishing coincidence, the number of bits in the input format
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is approximately the log2 of the number of MD5 evaluations that a
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five-year-old GPU can do in an hour.
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<!--
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Copyright © 1984-2025 by Landon Curt Noll and Leonid A. Broukhis. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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