How can I get hash from string and then string from hash back in javascript

Question

I have a really long (~70,000 characters) string that I want to insert into URL. I need to implement back-forward in a browser, so when the URL changes my app will react and change it's state.

This is the function I use to generate the hash code from the string:

String.prototype.hashCode = function () { var hash = 0, i, char; if (this.length == 0) return hash; var l = this.length; for (i = 0; i < l; i++) { char = this.charCodeAt(i); hash = ((hash << 5) - hash) + char; hash |= 0; // Convert to 32bit integer } return hash; }; 

But how can I get my string back from it's hash?

Edits: Is there any other way to compress such a long URL?

Answer 1

You can't. A hash is a one-way function. 560,000 bits cannot be converted into 32 bits and back again.

Answer 2

With Magic! (Saying it's not possible)

Answer 3

Depending on your use case, maybe you could have used a URL shortener service to compress your URL. Look at this example: https://twitter.com/peterjaric/status/336941762838945792 (I used tinyurl to compress long data-uris).

Direct link to tinyurl-page: http://tinyurl.com/peterjaric-page1