//+------------------------------------------------------------------+
//|                                                     HexUtils.mqh |
//|                                  Copyright 2026, Niquel Mendoza. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, Niquel Mendoza."
#property link      "https://www.mql5.com"
#property strict

#ifndef TSNSTD_SRC_ENCODING_HEXUTILS_MQH
#define TSNSTD_SRC_ENCODING_HEXUTILS_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#include <TSN\\Tables\\ParsersBasic.mqh>

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CHexUtils
 {
public:
                     CHexUtils(void) {}
                    ~CHexUtils(void) {}

  //---
  // in = entrada
  // i = offset incial de lectura
  // len = tamaño de elemtnos a leer
  // buf = buffer de salida
  // w = offset en el buffer de salida
  // 1. No se valida si len es el que dice ser (osea si es mayor que el in.. ni nada se asume input) valido lo mismo con i\w... etc..
  static int         HexToBytes(const uchar& in[], int i, int len, uchar& buf[], int w = 0);
  static int         HexToBytes(const string& in, int i, int len, uchar& buf[], int w = 0);

  //---
  // raw = bytes
  // t = tamaño de los bytes
  // out = string de salida
  // raw_i = offset de lecutra de raw
  static void        BytesToHexUpper(const uchar &raw[], int t, string& out, int raw_i = 0);
  static void        BytesToHexLower(const uchar &raw[], int t, string& out, int raw_i = 0);
 };

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
static int CHexUtils::HexToBytes(const uchar& in[], int i, int len, uchar &buf[], int w = 0)
 {
//---
  const int sob = len & 1;
  int exact_len = len - sob;
  const int req = (len >> 1) + sob;

//---
  if(ArraySize(buf) < req)
    ArrayResize(buf, req);

//---
  exact_len += i; // para que peuda empzar bien..


//---
  if(sob)
   {
    buf[w++] = g_arr_valid_hex_chars[in[i++]];
    exact_len++;
   }
//---
  for(; i < exact_len; i += 2)
    buf[w++] = (g_arr_valid_hex_chars[in[i]] << 4)  |  g_arr_valid_hex_chars[in[i + 1]];

//---
  return w;
 }

//+------------------------------------------------------------------+
static int CHexUtils::HexToBytes(const string &in, int i, int len, uchar &buf[], int w = 0)
 {
//---
  const int sob = len & 1;
  int exact_len = len - sob;
  const int req = (len >> 1) + sob;

//---
  if(ArraySize(buf) < req)
    ArrayResize(buf, req);

//---
  exact_len += i; // para que peuda empzar bien..

//---
  if(sob)
   {
    buf[w++] = g_arr_valid_hex_chars[(uchar)in[i++]];
    exact_len++;
   }
//---
  for(; i < exact_len; i += 2)
    buf[w++] = (g_arr_valid_hex_chars[(uchar)in[i]] << 4)  |  g_arr_valid_hex_chars[(uchar)in[i + 1]];

//---
  return w;
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#define MQLARTICLES_UENCODE_HEXUTILS_BYTEST \
 {                                      \
  StringInit(out, t << 1, ' ');         \
  int w = 0;                            \
  t+=raw_i;                             \
  for(; raw_i < t; raw_i++)             \
   {                                    \
    const uchar num = raw[raw_i];       \
    out.SetChar(w++,digitos[num >> 4]); \
    out.SetChar(w++,digitos[num & 15]); \
   }                                    \
 }

//+------------------------------------------------------------------+
static void CHexUtils::BytesToHexUpper(const uchar &raw[], int t, string& out, int raw_i = 0)
 {
//---
  static const uchar digitos[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
  MQLARTICLES_UENCODE_HEXUTILS_BYTEST
 }

//+------------------------------------------------------------------+
static void CHexUtils::BytesToHexLower(const uchar &raw[], int t, string& out, int raw_i = 0)
 {
//---
  static const uchar digitos[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
  MQLARTICLES_UENCODE_HEXUTILS_BYTEST
 }

}
//+------------------------------------------------------------------+


#endif // TSNSTD_SRC_ENCODING_HEXUTILS_MQH
//+------------------------------------------------------------------+