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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
#include "canprototools.h"
#include <android-base/logging.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/text_format.h>
#include <hidl/HidlTransportSupport.h>
#include <libcanhaltools/libcanhaltools.h>
#include <fstream>
namespace android::hardware::automotive::can::config {
using ICanController = V1_0::ICanController;
/**
* Helper function for parseConfigFile. readString is used to get the fist n characters (n) from an
* istream object (s) and return it as a string object.
*
* \param s istream of the file you intend to read.
* \param n streamsize object of the number of characters you'd like.
* \return optional string containing up to n characters from the stream(s) you provided.
*/
static std::optional<std::string> readString(std::istream& s, std::streamsize n) {
char buff[n];
auto got = s.read(buff, n).gcount();
if (!s.good() && !s.eof()) return std::nullopt;
return std::string(buff, 0, std::min(n, got));
}
std::optional<CanBusConfig> parseConfigFile(const std::string& filepath) {
std::ifstream cfg_stream(filepath);
// text headers that would be present in a plaintext proto config file.
static const std::array<std::string, 3> text_headers = {"buses", "#", "controller"};
auto cfg_file_snippet = readString(cfg_stream, 10);
if (!cfg_file_snippet.has_value()) {
LOG(ERROR) << "Can't open " << filepath << " for reading";
return std::nullopt;
}
cfg_stream.seekg(0);
// check if any of the textHeaders are at the start of the config file.
bool text_format = false;
for (auto const& header : text_headers) {
if (cfg_file_snippet->compare(0, header.length(), header) == 0) {
text_format = true;
break;
}
}
CanBusConfig config;
if (text_format) {
google::protobuf::io::IstreamInputStream pb_stream(&cfg_stream);
if (!google::protobuf::TextFormat::Parse(&pb_stream, &config)) {
LOG(ERROR) << "Failed to parse (text format) " << filepath;
return std::nullopt;
}
} else if (!config.ParseFromIstream(&cfg_stream)) {
LOG(ERROR) << "Failed to parse (binary format) " << filepath;
return std::nullopt;
}
return config;
}
std::optional<ICanController::BusConfig> fromPbBus(const Bus& pb_bus) {
ICanController::BusConfig bus_cfg = {};
bus_cfg.name = pb_bus.name();
switch (pb_bus.iface_type_case()) {
case Bus::kNative: {
const auto ifname = pb_bus.native().ifname();
const auto serialno = pb_bus.native().serialno();
if (ifname.empty() == serialno.empty()) {
LOG(ERROR) << "Invalid config: native type bus must have an iface name xor a "
<< "serial number";
return std::nullopt;
}
bus_cfg.bitrate = pb_bus.bitrate();
ICanController::BusConfig::InterfaceId::Socketcan socketcan = {};
if (!ifname.empty()) socketcan.ifname(ifname);
if (!serialno.empty()) socketcan.serialno({serialno.begin(), serialno.end()});
bus_cfg.interfaceId.socketcan(socketcan);
break;
}
case Bus::kSlcan: {
const auto ttyname = pb_bus.slcan().ttyname();
const auto serialno = pb_bus.slcan().serialno();
if (ttyname.empty() == serialno.empty()) {
LOG(ERROR) << "Invalid config: slcan type bus must have a tty name";
return std::nullopt;
}
bus_cfg.bitrate = pb_bus.bitrate();
ICanController::BusConfig::InterfaceId::Slcan slcan = {};
if (!ttyname.empty()) slcan.ttyname(ttyname);
if (!serialno.empty()) slcan.serialno({serialno.begin(), serialno.end()});
bus_cfg.interfaceId.slcan(slcan);
break;
}
case Bus::kVirtual: {
// Theoretically, we could just create the next available vcan iface.
const auto ifname = pb_bus.virtual_().ifname();
if (ifname.empty()) {
LOG(ERROR) << "Invalid config: native type bus must have an iface name";
return std::nullopt;
}
bus_cfg.interfaceId.virtualif({ifname});
break;
}
case Bus::kIndexed: {
const auto index = pb_bus.indexed().index();
if (index > UINT8_MAX) {
LOG(ERROR) << "Interface index out of range: " << index;
return std::nullopt;
}
bus_cfg.interfaceId.indexed({uint8_t(index)});
break;
}
default:
LOG(ERROR) << "Invalid config: bad interface type for " << bus_cfg.name;
return std::nullopt;
}
return bus_cfg;
}
std::optional<ICanController::InterfaceType> getHalIftype(const Bus& pb_bus) {
switch (pb_bus.iface_type_case()) {
case Bus::kNative:
return ICanController::InterfaceType::SOCKETCAN;
case Bus::kSlcan:
return ICanController::InterfaceType::SLCAN;
case Bus::kVirtual:
return ICanController::InterfaceType::VIRTUAL;
case Bus::kIndexed:
return ICanController::InterfaceType::INDEXED;
default:
return std::nullopt;
}
}
} // namespace android::hardware::automotive::can::config
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