In my Gnome Extension I would like to call GLib.convert. Sadly it does not work with strings but wants a ByteArray. Now I wonder how to convert a Javascript String into a UTF-16 Byte Array.
Bonus points if this uses some part of the Gnome bindings instead of implementing in Javascript.
ByteArray.fromString(someString, 'UTF-16') will convert your JS string into a UTF-16-encoded Uint8Array. This can be passed to GLib.convert (although, since fromString should understand all the encodings that GLib.convert does, maybe you don't need to after that?)
See also the ByteArray documentation.
Related
I have a nodejs application and need to convert a Buffer object to array of byte as c/c++ API's payload. I tried "Uint8Array" and "Array.prototype.slice.call", but it seems they don't work as expect. The API could not decode them correctly.
Is there any way I can do this?
Thanks.
Problem solved. I made a mistake before. After retest, to convert Buffer to Uint8Array which could be passed to c/c++ API as array of byte.
I'm pushing the limits of HTML5 here.
I have this problem: I have an javascript array of a billion doubles (or ints), anyways A LOT of numbers. I want to store this in the HTML5 localStorage.
You may say, hey, just use JSON.Stringify, BUT, JSON.Stringify produces a huge 200MB string. Because, a number (0.03910319 for example), is stored as a string (so each number is taking up some bytes instead of just a few bytes for the whole number).
I was thinking about base64 encoding the numbers in the array first, and then applying JSON.stringify?
Or is it for example better to JSON.Stringify and then GZip or use some compression function?
Come up with your creative ideas to encode/decode an javascript array of A BILLION ints/doubles in an efficient matter to a localStorage variable.
TensorFlowJS
I looked at TensorflowJS, my array is basically a 1-D Tensor. Tensorflow has some storage capabilities for models... Maybe that is a feasible solution.
For anyone who is also dealing with this problem:
I used a Float32Array (javascript typed array) for my data.
A Float32Array is easily stored in IndexedDB using https://github.com/localForage/localForage
I have a long string variable full of hex values that I need to convert to a string of ASCII characters. How do I do it?
JavaScript code
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A bit more clarification would help. Do you want to convert 0x4697 to decimal? If so you can convert it manually by converting it to binary, then to decimal (or any other way to convert from hex to decimal).
Or you can try this online tool that takes hex and returns decimal. Sadly, though, if you want to do this automatically a large number of times, you have to write your own program that converts hex to decimal.
If that's not what you want, please clarify.
EDIT: If you want to convert this hex code to ASCII characters, just copy the variable declaration and initialization into your JavaScript console, then type the name of the variable in the console. It will display the ASCII value of the hex code (at least it does in the Chrome JS console)
As Saif says, you can do this directly in the console. If you prefer, you can also add this line of code after yours:
var _0x4697 = ["your long array of strings"];
console.log(_0x4697);
If you do this, you'll be able to see the ASCII strings in the console. For more information on how to use the console with Chrome, see this.
Your assumptions are incorrect. Your code has several JavaScript string literals. They use \xXX escapes. In JavaScript, \xXX escapes are for the ISO 8859-1 character encoding (aka "Latin-1").
JavaScript (as well as Java, .NET, VB4/5/6, …) strings are counted sequences of UTF-16 code units. UTF-16 is one of several character encodings for Unicode character set. Unicode is a superset of ISO 8859-1 so there is nothing to be gained by using \xXX escapes.
JavaScript offers several types of escapes. One of which is \xXX, for historical reasons. Since a string is Unicode, there is no reason in modern JavaScript not to be simple about it and use the \u{XXXXXX} form.
It looks like the strings are JavaScript code themselves. JavaScript code doesn't use ASCII. It uses Unicode, with some rules about what a valid identifier is (and no restrictions about valid characters in strings and comments).
Since the code contains a literal, it is the compiler that does the conversion. You don't get a chance. You can see that you if print the value of the variable to the console.
console.log( _0x4697);
var 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console.log( _0x4697);
I want to write out to, and read in ieee format float/double values from a binary byte stream in a javascript module. Anyone know of how one would go about doing this? an equivalent to the doubleToRawLongBits and longBitsToDouble functionality in java.
You'll want to use a typed array for such things. Store your doubles into a Float64Array, then access the raw bytes from the underlying ArrayBuffer (and use bit shifts on those if you need single bits). If you're doing something more complicated, want to mix multiple types, or even control the endianness, overlay it with a DataView.
I'm struggling to find any resources on this online, which is concerning.
I've been reading about UCS-2 and UTF-16 woes, but I can't find a solution.
I need to get a value from an input:
var val = $('input').val()
and encode it to base64, treating the text as utf-16, so:
this is a test
becomes:
dABoAGkAcwAgAGkAcwAgAGEAIAB0AGUAcwB0AA==
and not the below, which you get treating it as UTF-8:
dGhpcyBpcyBhIHRlc3Q=
Your data, once read into JavaScript, will be in an encodingless numerical format (strictly speaking, it has to be in Unicode Normalised Form C, but Unicode is just a series of identifying numbers for each glyph in the Unicode lexicon. It's encoding-less). So: if you specifically need the data encoded as a UTF-16 byte sequence, do so, then base64 encode that.
But here's the fun part: which UTF-16 do you need? Little or Big Endian? With or without BOM? UTF-16 is a really inconvenient encoding format (we're not even going to touch UCS-2. It's obsolete. Has been for a long time).
What you really should need is to get a text value from your HTML element, Base64 encode its value, and then have whatever receives that data unpack it as UTF8; don't try to make JavaScript do more work than it has to. I presume you're sending this data to a server or something, in which case: your server language is way more elaborate than JavaScript, and can unpack text in about a million different encodings thanks to built-in functions. So just use that. Don't solve Y for X.