//
// Created by epagris on 2022.10.31..
//

#ifndef ETHERLIB_UTILS_H
#define ETHERLIB_UTILS_H

#include <stdio.h>
#include <stdint.h>
#include <memory.h>

#ifndef htonl
#define htonl(a)                    \
        ((((a) >> 24) & 0x000000ff) |   \
         (((a) >>  8) & 0x0000ff00) |   \
         (((a) <<  8) & 0x00ff0000) |   \
         (((a) << 24) & 0xff000000))
#endif

#ifndef ntohl
#define ntohl(a)    htonl((a))
#endif

#ifndef htons
#define htons(a)                \
        ((((a) >> 8) & 0x00ff) |    \
         (((a) << 8) & 0xff00))
#endif

#ifndef ntohs
#define ntohs(a)    htons((a))
#endif

#define ERROR(...) printf(__VA_ARGS__)
#define INFO(...) printf(__VA_ARGS__)

#define ASSERT_BAD_ALIGN(p) if ((size_t)(p) & 0b11) ERROR("Bad memory alignment in function '%s' in file '%s' on line %d!\n", __func__, __FILE__, __LINE__)
#define ASSERT_NULL(p) if ((p) == NULL) ERROR("NULL in function '%s' in file '%s' on line %d!\n", __func__, __FILE__, __LINE__)

#define ALIGN(p,t) (((size_t)(p) + (sizeof(t) - 1)) & ~(sizeof(t) - 1))

#define COPY_ADVANCE(dst,src,n) memcpy((dst), (src), n), src += n
#define COPY_WORD_H2N_ADVANCE(dst,w) { uint16_t u; memcpy(&u, w, 2); u = htons(u); memcpy((dst), &u, 2); w += 2; }
#define COPY_DWORD_H2N_ADVANCE(dst,dw) { uint32_t du; memcpy(&du, dw, 4); du = htonl(du); memcpy((dst), &du, 4); dw += 4; }

// ------------------

/**
 * Compute CRC-32 checksum.
 * @param data Data from which the checksum is being calculated.
 * @param size Size of data byte array.
 * @return checksum
 */
uint32_t crc32(const uint8_t * data, uint32_t size);

#endif //ETHERLIB_UTILS_H