PseudoCode

__int16 __cdecl commonPacketParser(void *class_ptr, int is_data_begin_start, char *packet_data, __int16 packet_size, void *Dst)
{
  int header_size; // eax@1
  _DWORD *v6; // ecx@2
  int v7; // edx@2
  int v8; // eax@3
  int v9; // eax@4
  char *data; // esi@6
  int v11; // eax@10
  int v12; // eax@11
  int v13; // eax@13
  void **v14; // ebp@19
  char *v15; // ebx@19
  unsigned __int16 parse_type; // ax@23
  int v17; // edi@25
  int i; // eax@25
  unsigned __int16 v19; // dx@26
  unsigned __int16 v20; // ax@30
  unsigned __int16 v21; // dx@34
  unsigned __int16 *v22; // eax@38
  int v24; // [sp+4h] [bp-Ch]@0
  signed int v25; // [sp+8h] [bp-8h]@2
  int v26; // [sp+Ch] [bp-4h]@2

  LOWORD(header_size) = *((_WORD *)class_ptr + 38024);
  if ( (_WORD)header_size )
  {
    v6 = Dst;
    v7 = (signed __int16)header_size;
    v26 = 0;
    v25 = 1;
    header_size = (signed __int16)header_size;
    if ( is_data_begin_start )
    {
      v8 = header_size - 1;
      if ( v8 )
      {
        v9 = v8 - 1;
        if ( !v9 )
        {
          v24 = *(_WORD *)(packet_data + 9);
          data = &packet_data[v7 + 9];
          goto LABEL_18;
        }
        if ( v9 == 2 )
        {
          v24 = *(_DWORD *)(packet_data + 9);
          data = &packet_data[v7 + 9];
LABEL_18:
          if ( !*((_WORD *)class_ptr + 38020) )
          {
LABEL_57:
            LOWORD(header_size) = 1;
            return header_size;
          }
          v14 = &Dst;
          v15 = (char *)class_ptr + 75784;
          while ( 1 )
          {
            if ( v25 & v24 )
            {
              if ( is_data_begin_start && data > &packet_data[packet_size] )
                goto LABEL_45;
              parse_type = *(_WORD *)v15;
              if ( *(_WORD *)v15 == 12 )
              {
                if ( *((_WORD *)v15 + 64) <= 1u )
                {
                  v20 = *(_WORD *)data;
                  if ( v6 )
                    *v6 = data;
                  data += v20 + 2;
                }
                else
                {
                  v17 = *data++;
                  for ( i = 0; i < v17; data += v19 + 2 )
                  {
                    v19 = *(_WORD *)data;
                    if ( v6 )
                      v6[i] = data;
                    ++i;
                  }
                }
              }
              else if ( parse_type == 13 )
              {
                v21 = *(_WORD *)data;
                if ( v6 )
                  *v6 = data + 2;
                data += v21 + 2;
                if ( is_data_begin_start && data > &packet_data[packet_size] )
                  goto LABEL_45;
                v22 = (unsigned __int16 *)v14[1];
                ++v14;
                if ( v22 )
                  *v22 = v21;
              }
              else if ( parse_type )
              {
                if ( is_data_begin_start
                  && &data[dword_802B80[parse_type] * *((_WORD *)v15 + 64)] > &packet_data[packet_size] )
                {
                  goto LABEL_45;
                }
                if ( v6 )
                  memcpy(v6, data, dword_802B80[parse_type] * *((_WORD *)v15 + 64));
                data += dword_802B80[*(_WORD *)v15] * *((_WORD *)v15 + 64);
              }
              else
              {
                if ( v6 )
                  *v6 = data;
                data += dword_802B80[*(_WORD *)v15] * *((_WORD *)v15 + 64);
                if ( is_data_begin_start && data > &packet_data[packet_size] )
                {
LABEL_45:
                  LOWORD(header_size) = 0;
                  return header_size;
                }
              }
            }
            else if ( v6 && *(_WORD *)v15 == 12 )
            {
              *v6 = 0;
            }
            else if ( *(_WORD *)v15 == 13 )
            {
              ++v14;
            }
            v25 *= 2;
            v6 = v14[1];
            ++v14;
            v15 += 2;
            if ( ++v26 >= *((_WORD *)class_ptr + 38020) )
              goto LABEL_57;
          }
        }
      }
      else
      {
        v24 = (unsigned __int8)packet_data[9];
      }
      data = &packet_data[v7 + 9];
      goto LABEL_18;
    }
    v11 = header_size - 1;
    if ( v11 )
    {
      v12 = v11 - 1;
      if ( v12 )
      {
        if ( v12 != 2 )
        {
LABEL_17:
          data = &packet_data[v7 + 2];
          goto LABEL_18;
        }
        v13 = *(_DWORD *)(packet_data + 2);
      }
      else
      {
        v13 = *((_WORD *)packet_data + 1);
      }
    }
    else
    {
      v13 = (unsigned __int8)packet_data[2];
    }
    v24 = v13;
    goto LABEL_17;
  }
  return header_size;
}