Giving -ve CheckSum for formData.

[deepak4u2006]

Hi I am using this library in my current project. It gives perfect checksum for the Test Strings, but in my real scenario I need to calculate the checksum of my formdata.
A typical formdata will be like;
var ADLER32 = require('adler-32'); let checkSum = ADLER32.str("formdata={\"data\":\"value\", \"key\":\"value1\", \"key2\":\"value2\"}123456");

I get a negative checksum for this input. -1415900241

for let checkSum = ADLER32.str("SheetJS");
I get proper checksum Value. 176947863

Hoping to get a solution !!!

[SheetJSDev]

@deepak4u2006 it is explained in the README:

The return value is a signed 32-bit integer.

If you need the unsigned value, convert to unsigned integer with >>>0:

var ADLER32 = require('adler-32');
let checkSum = ADLER32.str("formdata={\"data\":\"value\", \"key\":\"value1\", \"key2\":\"value2\"}123456") >>> 0;

Note that the web demo displays both types: http://oss.sheetjs.com/js-adler32/

That page uses the >>>0 trick to generate the unsigned value

[deepak4u2006]

@SheetJSDev Thanks for the quickest reply ever possible.
adding >>>0 worked like a dream.

Thanks again!!! 👍