lz-string | LZ-based compression algorithm for JavaScript | Compression library
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kandi X-RAY | lz-string Summary
LZ-based compression algorithm for JavaScript
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QUESTION
(Edited the title because I had no idea what I was looking for and it was misleading.)
Edit: What I was looking for was binary to string and back again. I have answered my own question below.)
Original Post: I'm trying to make a retro-style password system for a game made with JavaScript. (like on an old NES game for example that uses alpha-numeric characters to load the level you were on or all the flags pertaining to that level.)
I've gotten so far as generating a string of flags (all numeric) and then loading that string later by sorting through those flags with regex and then putting them back into my gamestate object (with objects in it that hold all my various flags).
Each flag is a number between 0-9 and each object (or group of flags) are 8 characters long. (often with leading zeros, so these groups are always 8 characters long)
A typical string could look like this:
var gameStr = "000102340000001000019531";
ANSWER
Answered 2021-May-08 at 19:08Where does the initial state that you want to compress come from? I guess there are three likely options.
It's random. Most likely that means some code seeded a pseudo random number generator using some value like e.g. the time of the day, then used that to produce the values. In this case, you could get your hands on the seed (which most likely would be a fairly short number) and use that as the identifier from which everything else is computed. Make sure to use a portable random number generator with well-defined deterministic behaviour, e.g. some Mersenne Twister implementation. The JavaScript built in number generator is implementation-defined so it does not fit this bill.
It came from some catalog made by the game developer (i.e. you). Then just obfuscating the index into that catalog might be good enough.
It came from some user hand-tuning the values. In this case you're out of luck, since as I understand the problem chances are that any possible combination could get entered. You can't compress a large set of values to a smaller set of values without losing information.
There might be middle grounds. You could have a randomised setup that subsequently got hand-tuned, and the description as initial seed plus a few modifications would be shorter than the full set of settings. Or the hand-tuning would only be allowed following specific rules set out by the game developer, which again would make for a limited set of possible values and a potentially shorter encoding. Thinking along these categories might help you analyze your own situation and find a suitable solution.
You can also look at this from an information theory point of view. You can't expect to encode a sequence of fully independent and uniformly distributed digits with less information than those digits, perhaps expressed in some other base or whatever. You can compress data if there are patterns to it that make some combinations more likely than others. The more you tell us about these patterns, the better we might be able to advise. In total you can't get below the entropy of the source (i.e. game state distribution), so estimating that might help you find a lower bound for what to expect.
QUESTION
I have been developing a frontend app using React (v16.44.0, cannot upgrade to v17 yet due to a dependency), react-scripts v3.4.4, Typescript (v3.9.9) and React-Bootstrap (v1.5.1) for a few months and all is going well.
However, react-scripts have been updated recently to a v4, and upgrading breaks the whole app. I am concerned with securities issues with react-scripts v3. I also would like to upgrade Typescript to v4+, there seem to be an incompatibility btw Typescript 4 and react-scripts 3 related to eslint. Various deprecation warnings are also stacking up.
When I enable react-scripts v4.0.3, run npm start to launch the development server, Firefox (v78.8) throws:
"ReferenceError: SharedArrayBuffer is not defined" in "node_modules/webidl-conversions/lib/index.js:347".
Apparently webidl-conversions is required by bootstrap. I have searched about the SharedArrayBuffer issue, apparently it requires enabling additional headers, but I could not find how to add them using the npm start webserver.
[Edit: upgraded Firefox to v86, still have the issue but I have not tried to configure it yet.]
If I try with Chrome (v89), I have:
"TypeError: Cannot convert undefined or null to object" on "node_modules/whatwg-url/dist/utils.js:48"
which also seem to be required by Bootstrap.
I do not have a dependency on Bootstrap per se, I use the react-bootstrap implementation. However, I use bootstrap-scss for the (S)CSS part.
I can upload full stack traces if needed. Here is my package.json:
...ANSWER
Answered 2021-Mar-10 at 11:39Did you apply each migration described in the changelog?
They also suggest you delete node_modules if you break your app when updating from 3.4 to 4.
QUESTION
I have data that I encrypt using lz-string package.
I also convert the result to base64 and using atob() function to convert from base64.
The problem is atob() doesn't work as expected but Buffer.from(b64, 'base64').toString(); does.
Why? how do I fix that? I need to use atob in the client side (the Buffer is not exist in the browser).
ANSWER
Answered 2020-Jul-31 at 14:55Use decodeURIComponent and escape to convert to UTF-8.
QUESTION
https://pieroxy.net/blog/pages/lz-string/guide.html
I have some Base64 data url strings which need to be compressed into shorter strings. I have downloaded the LZString library and tried to use Base64String.compress(base64) and Base64String.decompress(compressedBase64) as demonstrated in above official guide.
While the data urls are used for displaying images in offline page, the page is expected to be in compressed size, so each string has to be decompressed within the offline page. Here is a simplified code sample:
...ANSWER
Answered 2020-May-15 at 10:34Instead of trying to concatenate to create a string containing valid Javascript syntax, save the compressed string somewhere else from which static Javascript can retrieve and parse it. You could use
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