src/libais/decode_body.cpp
// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// TODO(schwehr): Add logging back in or remove it.
#include "decode_body.h"
#include <memory>
#include <string>
#include "ais.h"
using libais::AisMsg;
using std::unique_ptr;
namespace libais {
// TODO(schwehr): Switch to make_unique when C++14 is available on Travis-CI.
template <typename T, typename... Args>
std::unique_ptr<T> MakeUnique(Args &&... args) {
return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
}
unique_ptr<AisMsg> CreateAisMsg6(const std::string &body, const int fill_bits) {
libais::Ais6 msg(body.c_str(), fill_bits);
switch (msg.dac) {
// International Maritime Organization (IMO).
case libais::AIS_DAC_1_INTERNATIONAL:
switch (msg.fi) {
case 0:
return MakeUnique<libais::Ais6_1_0>(body.c_str(), fill_bits);
case 1:
return MakeUnique<libais::Ais6_1_1>(body.c_str(), fill_bits);
case 2:
return MakeUnique<libais::Ais6_1_2>(body.c_str(), fill_bits);
case 3:
return MakeUnique<libais::Ais6_1_3>(body.c_str(), fill_bits);
case 4:
return MakeUnique<libais::Ais6_1_4>(body.c_str(), fill_bits);
case 12:
return MakeUnique<libais::Ais6_1_12>(body.c_str(), fill_bits);
case 14:
return MakeUnique<libais::Ais6_1_14>(body.c_str(), fill_bits);
case 18:
return MakeUnique<libais::Ais6_1_18>(body.c_str(), fill_bits);
case 20:
return MakeUnique<libais::Ais6_1_20>(body.c_str(), fill_bits);
case 25:
return MakeUnique<libais::Ais6_1_25>(body.c_str(), fill_bits);
// TODO(schwehr): 28.
// TODO(schwehr): 30.
case 32:
return MakeUnique<libais::Ais6_1_32>(body.c_str(), fill_bits);
case 40:
return MakeUnique<libais::Ais6_1_40>(body.c_str(), fill_bits);
}
// FI not handled.
break;
}
return nullptr;
}
unique_ptr<AisMsg> CreateAisMsg8(const std::string &body, const int fill_bits) {
libais::Ais8 msg(body.c_str(), fill_bits);
switch (msg.dac) {
// International Maritime Organization (IMO).
case libais::AIS_DAC_1_INTERNATIONAL:
switch (msg.fi) {
case 0:
return MakeUnique<libais::Ais8_1_0>(body.c_str(), fill_bits);
case 11:
return MakeUnique<libais::Ais8_1_11>(body.c_str(), fill_bits);
case 13:
return MakeUnique<libais::Ais8_1_13>(body.c_str(), fill_bits);
case 15:
return MakeUnique<libais::Ais8_1_15>(body.c_str(), fill_bits);
case 16:
return MakeUnique<libais::Ais8_1_16>(body.c_str(), fill_bits);
case 17:
return MakeUnique<libais::Ais8_1_17>(body.c_str(), fill_bits);
case 19:
return MakeUnique<libais::Ais8_1_19>(body.c_str(), fill_bits);
case 21:
return MakeUnique<libais::Ais8_1_21>(body.c_str(), fill_bits);
case 22:
return MakeUnique<libais::Ais8_1_22>(body.c_str(), fill_bits);
case 24:
return MakeUnique<libais::Ais8_1_24>(body.c_str(), fill_bits);
case 26:
return MakeUnique<libais::Ais8_1_26>(body.c_str(), fill_bits);
case 27:
return MakeUnique<libais::Ais8_1_27>(body.c_str(), fill_bits);
case 29:
return MakeUnique<libais::Ais8_1_29>(body.c_str(), fill_bits);
case 31:
return MakeUnique<libais::Ais8_1_31>(body.c_str(), fill_bits);
}
// FI not handled.
break;
// European River Information System (RIS).
case libais::AIS_DAC_200_RIS:
switch (msg.fi) {
case 10:
// Inland ship static and voyage related data
return MakeUnique<libais::Ais8_200_10>(body.c_str(), fill_bits);
case 21:
// ETA at lock/bridge/terminal
return MakeUnique<libais::Ais8_200_21>(body.c_str(), fill_bits);
case 22:
// RTA at lock/bridge/terminal
return MakeUnique<libais::Ais8_200_22>(body.c_str(), fill_bits);
case 23:
// EMMA warning
return MakeUnique<libais::Ais8_200_23>(body.c_str(), fill_bits);
case 24:
// Water levels
return MakeUnique<libais::Ais8_200_24>(body.c_str(), fill_bits);
case 40:
// Signal status
return MakeUnique<libais::Ais8_200_40>(body.c_str(), fill_bits);
case 55:
// Number of persons on board
return MakeUnique<libais::Ais8_200_55>(body.c_str(), fill_bits);
}
// FI not handled.
break;
// TODO(schwehr): 366 US Coast Guard.
case 367: // US Coast Guard.
switch (msg.fi) {
case 22:
return MakeUnique<libais::Ais8_367_22>(body.c_str(), fill_bits);
case 23:
return MakeUnique<libais::Ais8_367_23>(body.c_str(), fill_bits);
case 24:
return MakeUnique<libais::Ais8_367_24>(body.c_str(), fill_bits);
case 25:
return MakeUnique<libais::Ais8_367_25>(body.c_str(), fill_bits);
case 33:
return MakeUnique<libais::Ais8_367_33>(body.c_str(), fill_bits);
}
// FI not handled.
break;
}
return nullptr;
}
unique_ptr<AisMsg> CreateAisMsg(const std::string &body, const int fill_bits) {
if (body.empty()) {
return nullptr;
}
if (fill_bits < 0 || fill_bits > 5) {
return nullptr;
}
switch (body[0]) {
case '1': // FALLTHROUGH
case '2': // FALLTHROUGH
case '3': // 1-3: Class A position report.
return MakeUnique<libais::Ais1_2_3>(body.c_str(), fill_bits);
case '4': // FALLTHROUGH - 4 - Basestation report
case ';': // 11 - UTC date response
return MakeUnique<libais::Ais4_11>(body.c_str(), fill_bits);
case '5': // 5 - Ship and Cargo
return MakeUnique<libais::Ais5>(body.c_str(), fill_bits);
case '6': // 6 - Addressed binary message
return CreateAisMsg6(body, fill_bits);
case '7': // FALLTHROUGH - 7 - ACK for addressed binary message
case '=': // 13 - ASRM Ack (safety message)
return MakeUnique<libais::Ais7_13>(body.c_str(), fill_bits);
case '8': // 8 - Binary broadcast message (BBM)
return CreateAisMsg8(body, fill_bits);
case '9': // 9 - SAR Position
return MakeUnique<libais::Ais9>(body.c_str(), fill_bits);
case ':': // 10 - UTC Query
return MakeUnique<libais::Ais10>(body.c_str(), fill_bits);
// ';' 11 - See 4
case '<': // 12 - Addressed Safety Related Messages (ASRM)
return MakeUnique<libais::Ais12>(body.c_str(), fill_bits);
// '=' 13 - See 7
case '>': // 14 - Safety Related Broadcast Message (SRBM)
return MakeUnique<libais::Ais14>(body.c_str(), fill_bits);
case '?': // 15 - Interrogation
return MakeUnique<libais::Ais15>(body.c_str(), fill_bits);
case '@': // 16 - Assigned mode command
return MakeUnique<libais::Ais16>(body.c_str(), fill_bits);
case 'A': // 17 - GNSS broadcast
return MakeUnique<libais::Ais17>(body.c_str(), fill_bits);
case 'B': // 18 - Position, Class B
return MakeUnique<libais::Ais18>(body.c_str(), fill_bits);
case 'C': // 19 - Position and ship, Class B
return MakeUnique<libais::Ais19>(body.c_str(), fill_bits);
case 'D': // 20 - Data link management
return MakeUnique<libais::Ais20>(body.c_str(), fill_bits);
case 'E': // 21 - Aids to navigation report
return MakeUnique<libais::Ais21>(body.c_str(), fill_bits);
case 'F': // 22 - Channel Management
return MakeUnique<libais::Ais22>(body.c_str(), fill_bits);
case 'G': // 23 - Group Assignment Command
return MakeUnique<libais::Ais23>(body.c_str(), fill_bits);
case 'H': // 24 - Static data report
return MakeUnique<libais::Ais24>(body.c_str(), fill_bits);
case 'I': // 25 - Single slot binary message
return MakeUnique<libais::Ais25>(body.c_str(), fill_bits);
case 'J': // 26 - Multi slot binary message with comm state
return MakeUnique<libais::Ais26>(body.c_str(), fill_bits);
case 'K': // 27 - Long-range AIS broadcast message
return MakeUnique<libais::Ais27>(body.c_str(), fill_bits);
default:
return nullptr;
}
return nullptr;
}
} // namespace libais