Programmer Humor

that's awesome! I'm just migrating all my data to πfs. finally mathematics is put to a proper use!

Breakthrough vibes

It's an interesting question, though. How far CAN you compress? At some point you've extracted every information contained and increased the density to a maximum about - but what is that density?

That's the kind of manager that also tells you that you just lack creativity and vision if you tell them that it's not possible. They also post regularly on LinkedIn

u can have everthing in a single bit, if the decompressor includes the whole universe

Send him your work: 1 (or 0 ofc)

https://xkcd.com/1381/

Just make a file system that maps each file name to 2 files. The 0 file and the 1 file.

Now with just a filename and 1 bit, you can have any file! The file is just 1 bit. It's the filesystems that needs more than that.

That’s precisely when you bet on it.

Link?

There is a water shortage?

Have a macro that decreases all font size on opening and then increases all again before closing.

Follow me irl for more compression techniques.

per page

I mean, yes. obviously.

If you had 1000 bytes of text on 1 page before, you now have 1byte per page on 1000 pages afterwards

You could always diff the XML before and after to see what's causing it.

Nice read, thanks!

I was sort of on Mike Goldman (the challenge giver)'s side until I saw the great point made at the end that the entire challenge was akin to a bar room bet; Goldman had always set it up as a kind of scam from the start and was clearly more than happy to take $100 from anyone who fell for it, and so should have taken responsibility when someone managed to meet the wording of his challenge.

Nice stuff.

I got sold on the :

EOF does not consume less space than "5"

because, even though the space taken by the filesystem is the fault of the filesystem, one needs to consider the minimum information requirements of stating starts and ends of files, specially when stuff is split into multiple files.

I would have actually considered the file size information as part of the file size instead (for both the input and the output) because, for a binary file, which can include a string of bits which might match an EOF, causing a falsely ended file, would be a problem. And as such, the contestant didn't go checking for character == EOF, but used the function that truly tells whether the end of file is reached, which would, then be using the file system's file size information.

Since the input file was a 3145728 bytes and the output files would have been smaller than that, I would go with 22 bits to store the file size information. This would be in favour of the contestant as:

1. That would be the minimum (hyh) number of bits required to store the file size, making it as easy as possible for the contestant to make more files
2. You could actually go with 2 bits, if you predefine MiB to be the unit, but that would make it harder for the contestant, because they will be unable to present file sizes less than 1 MiB, and would have to increase the file size information bits

On the other hand, had the contestant decided to break the file between bits (instead at byte ends), instead of bytes (which, from the code, I think they didn't) the file size information would require an additional 3 bits.

Now, using this logic, if I check the result:

From the result claimed by the contestant, there were 44 extra bytes (352 bits) remaining.

+ 22 bits for the input file size information - 22*219 bits for the output file size information because 219 files

so the contestant succeeds by 352 + 22 − (22 × 219) = −4444 bits. In other words, fails by 4444 bits.

Now of course, the output file size information might be representable in a smaller number of bits, but to calculate that, I would require downloading the file (which I am not in the mood for.
And in that case, you would require additional information to tell the file size bits. So;

• 5 bits for the number 22 in the input
• 5 bits for the size of the file size information (I am feeling this won't give significant gains) and rest of the bits as stated in the first 5 bits, as the file size bits
  • you waste bits for every file size requiring more than 16 bits to store the file size information
  • it is possible to get a net gain with this, as qalc says, log(3145728 / 219, 2) = (ln(1048576) − ln(73)) / ln(2) ≈ 13.81017544

But even then, you have 352 + 5 + 22 − (5 + (14 × 219)) = −2692 for the best case scenario in which all output file sizes manage to be under 14 bits of file size informations. More realistically, it would be something around 352 + 5 + 22 − ((5 + 14) × 219) = −3782 because you will the the 5 bits for every file, separately, with the 14 in this case, be a changing value for every file, giving a possibly smaller number.

If instead going with the naive 8 bit EOF that the offerer desired, well, going with 2 consecutive characters instead of a single one, seems doable. As long as you are able to find enough of said 2 characters.
After going on a little google search, I seem to think that in a 3MiB file, there would be either 47 or 383 (depending upon which of my formulae was correct) possible occurrences of the same 2 character combination. Well, you'd need to find the correct combination.

But of course, that's not exactly compression for a binary file, as I said before, as an EOF is not good enough.

Even better! According to no hiding theorem, you can't destroy information. With black holes you maybe possibly could be able to recover the data as it leaks through the Hawking radiation.
Perfect for long term storage

The design is very human

Browse your own machine as if it's under alt.film.binaries but more so

I'd go with a prefix, so it's ls-friendly.