How to search in a BYTE array for a pattern?

Question

I have a Byte array :

BYTE Buffer[20000]; this array contains the following data:

00FFFFFFFFFFFF0010AC4C4053433442341401030A2

Answer 1

Try this, just needed it:

// Returns a pointer to the first byte of needle inside haystack, 
static uint8_t* bytes_find(uint8_t* haystack, size_t haystackLen, uint8_t* needle, size_t needleLen) {
    if (needleLen > haystackLen) {
        return false;
    }
    uint8_t* match = memchr(haystack, needle[0], haystackLen);
    if (match != NULL) {
        size_t remaining = haystackLen - ((uint8_t*)match - haystack);
        if (needleLen <= remaining) {
            if (memcmp(match, needle, needleLen) == 0) {
                return match;
            }
        }
    }
    return NULL;
}