frame::frame(buffer_sptr buf) :
buf_(buf)
{
const size_t min_frame_sz = 10; // sizeof(ACK_frame)
if(buf->data_size() < min_frame_sz) {
ostringstream msg;
msg << "frame too small (" << buf->data_size() << " <= " << min_frame_sz << " octets)";
msg << hex << setw(2) << setfill('0') << dump(buf->data_size(), buf->data()) << endl;
raise<length_error>(__PRETTY_FUNCTION__, __FILE__, __LINE__, msg.str());
}
}
data_frame::data_frame(buffer_sptr buf) :
frame(buf)
{
const size_t min_data_frame_sz = 24;
if(buf->data_size() < min_data_frame_sz) {
ostringstream msg;
msg << "data frame too small (" << buf->data_size() << " <= " << min_data_frame_sz << " octets)";
msg << hex << setw(2) << setfill('0') << dump(buf->data_size(), buf->data()) << endl;
raise<invalid_argument>(__PRETTY_FUNCTION__, __FILE__, __LINE__, msg.str());
}
}
uint8_t
mgmt_frame::IE(uint8_t tag) const
{
uint8_t tag_size;
size_t frame_sz = buf_->data_size();
for(size_t i = 0x24; i < frame_sz; i += tag_size) {
const uint8_t t = buf_->read_u8(i);
const uint8_t l = buf_->read_u8(i+1);
if(t == tag && l == 1) {
return buf_->read_u8(i+2);
}
tag_size = l + 2;
}
ostringstream msg;
msg << "unknown IE (tag=" << hex << setw(2) << setfill('0') << tag << ")";
msg << hex << setw(2) << setfill('0') << dump(buf_->data_size(), buf_->data()) << endl;
raise<invalid_argument>(__PRETTY_FUNCTION__, __FILE__, __LINE__, msg.str());
}