#include "string_utils.hpp"

#include <stdint.h>
#include <string.h>

using namespace iflytop;
/*******************************************************************************
 *                                    TOOLS                                    *
 *******************************************************************************/
uint8_t *StringUtils::hex_str_to_bytes(char *data, int32_t len, int32_t &bytelen) {
  /**
   * @brief
   *  data:
   *    12 34 56 78 90 ab cd ef
   *
   */
  static uint8_t bytes_cache[1024] = {0};
  static uint8_t data_cache[1024]  = {0};

  int32_t data_len = 0;

  memset(bytes_cache, 0, sizeof(bytes_cache));
  memset(data_cache, 0, sizeof(data_cache));

  for (int32_t i = 0; i < len; i++) {
    if (data[i] == ' ') continue;
    if (data[i] == '\r' || data[i] == '\n' || data[i] == '\0') break;
    data_cache[data_len] = data[i];
    data_len++;
  }

  if (data_len % 2 != 0) {
    return NULL;
  }

  for (int32_t i = 0; i < data_len; i += 2) {
    char c1 = data_cache[i];
    char c2 = data_cache[i + 1];
    if (c1 >= '0' && c1 <= '9') {
      c1 = c1 - '0';
    } else if (c1 >= 'a' && c1 <= 'f') {
      c1 = c1 - 'a' + 10;
    } else if (c1 >= 'A' && c1 <= 'F') {
      c1 = c1 - 'A' + 10;
    } else {
      return NULL;
    }

    if (c2 >= '0' && c2 <= '9') {
      c2 = c2 - '0';
    } else if (c2 >= 'a' && c2 <= 'f') {
      c2 = c2 - 'a' + 10;
    } else if (c2 >= 'A' && c2 <= 'F') {
      c2 = c2 - 'A' + 10;
    } else {
      return NULL;
    }

    bytes_cache[i / 2] = (c1 << 4) | c2;
  }

  bytelen = data_len / 2;
  return bytes_cache;
}