CODEWITHSUNDEEP
javascriptphp
bring2dip
bring2dip

Reputation: 885

Convert hexadecimal to 32 float in javascript

I have this function in php that would convert hexadecimal to 32 float in php. How do you do it in Javascript

public static function hexTo32Float($val)
{
    $packed=pack("H*",$val);
    $reversedpac=strrev($packed);
    $unpack=unpack( "f",$reversedpac);

    return array_shift($unpack);
}

Upvotes: 1

Views: 827

Answers (2)

Sebastien C.
Sebastien C.

Reputation: 4833

What about playing with TypedArray (that will only work with recent browsers) ?

var intData = Uint32Array(1);
intData[0] = parseInt("42458c14", 16);
var dataAsFloat = new Float32Array(intData.buffer);
var result = dataAsFloat[0];
// result == 49.38679504394531

EDIT (one year later ...) : It does seem that the result could depend on whether or not your CPU is big indian or little indian. Be careful when using this.

Upvotes: 2

Callahan
Callahan

Reputation: 474

After a complete BS answer try the following I found in the answer to this question:
var b = new Buffer(hexNumber, 'hex').readFloatBE(0).
edit: The fault was the usage of readFloatLE here.
For further explanation: The point here is that readFloatXX() expects buffer contents as two's complement signed values. I guess readFloatLE is the version for unsigned floats (could not find that in the docs, though).

Upvotes: 0

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