riologiuseppe/crc-full

The crc-full module is used to calculate any kind of CRC setting parameters such as length, polynomial and others. It's completely written in typescript for node js.

crc-full's Issues

Match CRC from C code to crc-full

Hello,

I have to send a message from typescript to our device and at the device side, it validates the message using a CRC16.

Here is how the device validates it:

#define CRC_MASK 0x1021 /* x^16 + x^12 + x^5 + x^0 */

UINT16 CRC_Calc (unsigned char *pbData, int iLength)
{
    UINT16 wData, wCRC = 0;
    int i;

    for ( ;iLength > 0; iLength--, pbData++) {
        wData = (UINT16) (((UINT16) *pbData) << 8);
        for (i = 0; i < 8; i++, wData <<= 1) {
            if ((wCRC ^ wData) & 0x8000)
                wCRC = (UINT16) ((wCRC << 1) ^ CRC_MASK);
            else
                wCRC <<= 1;
        }
    }
    return wCRC;
}

The input data would be "OPN\x17" (where \x17 is an ETB control character). The output must be A8A9.

Given that input data, the C sample code, can you provide me a sample code using your package to achieve the same result?

Thank you! I appreciate any help.

Best regards,
Gutemberg

[CRC32_C] Compute result is negative value

For example:

// for (0-100 hex)
let data = '0102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F202122232425262728292A2B2C2D2E2F303132333435363738393A3B3C3D3E3F404142434445464748494A4B4C4D4E4F505152535455565758595A5B5C5D5E5F6061626364';
let buf = Buffer.from(data, 'hex'); 
let crc = CRC.default("CRC32_C");
let computed_crc = crc.compute(source);
// output is: -5DA0519C

But for correct value should be 0xA25FAE64, you can test in website 'http://crccalc.com/' with the same data and 'hex' option selected.

Pls help to check it.