parse_tlvs_from_APDU.c

int __fastcall parse_tlvs_from_APDU(parsed_tlvs_t *out_apdus, char *in_buf, int start_offset, int total_length)
{
  parsed_tlvs_t *parsed_tlvs_t; // r4
  char *in_buf_; // r8
  int total_length_; // r7
  int offset; // r5
  int i; // r6
  tlv_t *tlv_obj; // r0
  int ret; // r0

  parsed_tlvs_t = out_apdus;
  in_buf_ = in_buf;
  total_length_ = total_length;
  offset = start_offset;
  if ( out_apdus && out_apdus->num_slots_used ) // 
                                                // so this is basically an array of TLV
                                                // objects that we parse out.
                                                // 
                                                // a TLV instance always point to a tag object
                                                // also, which is its kind basically.
  {
    for ( i = 0; parsed_tlvs_t->num_slots_used > i; ++i )
      free_tlv_obj(parsed_tlvs_t->tlv_array[i]);
  }
  parsed_tlvs_t->num_slots_used = 0;
  while ( 1 )
  {
    tlv_obj = create_TLV_obj_wrap(in_buf_, offset, total_length_);// checks apdu len, but nothing about destination length
    if ( !tlv_obj )
      break;
    parsed_tlvs_t->tlv_array[parsed_tlvs_t->num_slots_used++] = tlv_obj;
    offset += get_apdu_len(tlv_obj);
    if ( offset == total_length_ )              // 
                                                // we have parsed everything, return.
    {
      ret = parsed_tlvs_t->num_slots_used;
      JUMPOUT(&return_);
    }
  }
  JUMPOUT(&return_);
}