#include "crc32.h"

#ifdef __aarch64__
#include <arm_acle.h>
#endif

uint32_t crc32(const uint8_t* input, size_t length){
    
    // #ifdef __aarch64__
    // crc32_arm(input,length);
    // #else
    uint32_t crc = 0xFFFFFFFFu;
    while(length--){
        crc = lookup[*input++ ^ (crc & 0xFF)] ^ (crc>>8);
    }

    return ~crc;
    // #endif
}

// #ifdef __aarch64__
// uint32_t crc32_arm(const uint8_t *input, size_t length) {
//     const uint8_t *bytes = (const uint8_t *)input;
//     uint32_t crc;
    
//     // Process data in blocks of 64 bits (8 bytes) for optimal performance
//     while (length >= 8) {
//         crc = __crc32b(crc, *((uint64_t*)bytes));
//         bytes += 8;
//         length -= 8;
//     }

//     // Process remaining bytes
//     while (length--) {
//         crc = __crc32b(crc, *bytes++);
//     }

//     return crc;
// }
// #endif