/*
 * NOSTR Core Library - Utilities
 * 
 * General utility functions used across multiple NIPs
 */

#include "utils.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/**
 * Convert bytes to hexadecimal string
 */
void nostr_bytes_to_hex(const unsigned char* bytes, size_t len, char* hex) {
    for (size_t i = 0; i < len; i++) {
        sprintf(hex + i * 2, "%02x", bytes[i]);
    }
    hex[len * 2] = '\0';
}

/**
 * Convert hexadecimal string to bytes
 */
int nostr_hex_to_bytes(const char* hex, unsigned char* bytes, size_t len) {
    if (strlen(hex) != len * 2) {
        return -1; // NOSTR_ERROR_INVALID_INPUT
    }
    
    for (size_t i = 0; i < len; i++) {
        if (sscanf(hex + i * 2, "%02hhx", &bytes[i]) != 1) {
            return -1; // NOSTR_ERROR_INVALID_INPUT
        }
    }
    return 0; // NOSTR_SUCCESS
}