Java: updating CRC32 from a thread

Question

Do I really not understand the use of any of the classes CRC32or CheckedInputStreamto calculate the checksum by continuously updating with the last input? When the input is <= 128KiB, a valid CRC32 is generated. Anything greater than 128KiB and the checksum fails. Below is the code I'm working with (using the CRC32and object BufferedInputStream, but the same problem occurs if I use CheckedInputStreamCRC32 to track).

I would appreciate any advice or comments, thanks

private static long calcCRC32() throws IOException {
    BufferedInputStream inStream = new BufferedInputStream(System.in);
    int BLOCK_SIZE = 128*1024; //128KiB
    int len;
    byte[] buffer = new byte[BLOCK_SIZE];

    CRC32 crc32 = new CRC32();
    crc32.reset();

    while((len = bufferedInputStream.read(buffer, 0, BLOCK_SIZE)) > 0){         
        crc32.update(buffer, 0, len);
        buffer = new byte[BLOCK_SIZE];
    }

    return crc32.getValue();
}