Calculate CRC32 from digit - how? about js-crc32 HOT 3 CLOSED

Thank you, I did something similar you provided, but it would be great to have additional function like CRC32.int or CRC32.hex to calculate CRC without extra code.

How did you get that CRC result 0x0AAFD11A?

You are right, the result should be 0xe9fc314b it was my mistake.

from js-crc32.

additional function like CRC32.int or CRC32.hex to calculate CRC without extra code

C'mon, splitting number into 4 bytes isn't worth any library support, and calculating 32-bit crc from 32-bit number does not seem to be very common use case.

from js-crc32.

CRC32.buf can take an array of bytes and CRC32.bstr can take a binary string. Both return a signed 32-bit integer that you can convert to hex through unsigned conversion >>>0 and toString(16).

To convert the 32-bit number to bytes you can either unwind the bytes manually or use a Uint32Array:

var num = 0x200031E0;

/* Uint8Array */
var ua = new Uint8Array((new Uint32Array([num])).buffer); // Uint8Array [ 224, 49, 0, 32 ]
(CRC32.buf(ua)>>>0).toString(16); // e9fc314b

/* Array of bytes */
var arr = [], n2 = num; for(var i = 0; i < 4; ++i, n2>>>=8) arr[i] = n2 & 0xFF; // arr = [ 224, 49, 0, 32 ]
(CRC32.buf(arr)>>>0).toString(16); // e9fc314b

/* Binary string */
var bstr = ""; for(i = 0, n2 = num; i < 4; ++i, n2>>>=8) bstr += String.fromCharCode(n2 & 0xFF); // bstr = '\xe0\x31\x00\x20'
(CRC32.bstr(bstr)>>>0).toString(16); // e9fc314b

The result is determined to be 0xe9fc314b. How did you get that CRC result 0x0AAFD11A?

from js-crc32.