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125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
#include <scwx/wsr88d/nexrad_file_factory.hpp>
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#include <scwx/wsr88d/ar2v_file.hpp>
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#include <scwx/wsr88d/level3_file.hpp>
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#include <fstream>
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#include <sstream>
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#include <boost/iostreams/copy.hpp>
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#include <boost/iostreams/filtering_streambuf.hpp>
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#include <boost/iostreams/filter/gzip.hpp>
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#include <boost/log/trivial.hpp>
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namespace scwx
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{
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namespace wsr88d
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{
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static const std::string logPrefix_ = "[scwx::wsr88d::nexrad_file_factory] ";
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std::shared_ptr<NexradFile>
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NexradFileFactory::Create(const std::string& filename)
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{
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BOOST_LOG_TRIVIAL(debug) << logPrefix_ << "Create(" << filename << ")";
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std::shared_ptr<NexradFile> nexradFile = nullptr;
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bool fileValid = true;
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std::ifstream f(filename, std::ios_base::in | std::ios_base::binary);
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if (!f.good())
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{
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BOOST_LOG_TRIVIAL(warning)
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<< logPrefix_ << "Could not open file for reading: " << filename;
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fileValid = false;
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}
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if (fileValid)
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{
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nexradFile = Create(f);
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}
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return nexradFile;
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}
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std::shared_ptr<NexradFile> NexradFileFactory::Create(std::istream& is)
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{
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std::shared_ptr<NexradFile> message = nullptr;
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std::istream* pis = &is;
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std::streampos pisBegin = is.tellg();
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std::stringstream ss;
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std::string buffer;
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bool dataValid;
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buffer.resize(4);
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is.read(buffer.data(), 4);
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dataValid = is.good();
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is.seekg(pisBegin, std::ios_base::beg);
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if (dataValid && buffer.starts_with("\x1f\x8b"))
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{
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boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
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in.push(boost::iostreams::gzip_decompressor());
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in.push(is);
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try
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{
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std::streamsize bytesCopied = boost::iostreams::copy(in, ss);
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pis = &ss;
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pisBegin = ss.tellg();
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ss.read(buffer.data(), 4);
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dataValid = ss.good();
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ss.seekg(pisBegin, std::ios_base::beg);
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BOOST_LOG_TRIVIAL(trace)
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<< logPrefix_ << "Decompressed file = " << bytesCopied << " bytes";
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if (!dataValid)
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{
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BOOST_LOG_TRIVIAL(warning)
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<< logPrefix_ << "Error reading decompressed stream";
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}
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}
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catch (const boost::iostreams::gzip_error& ex)
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{
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BOOST_LOG_TRIVIAL(warning)
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<< logPrefix_ << "Error decompressing file: " << ex.what();
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dataValid = false;
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}
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}
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else if (!dataValid)
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{
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BOOST_LOG_TRIVIAL(warning) << logPrefix_ << "Error reading file";
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}
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if (dataValid)
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{
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if (buffer.starts_with("AR2V"))
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{
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message = std::make_shared<Ar2vFile>();
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}
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else
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{
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message = std::make_shared<Level3File>();
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}
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}
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if (message != nullptr)
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{
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dataValid = message->LoadData(*pis);
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if (!dataValid)
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{
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message = nullptr;
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}
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}
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return message;
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}
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} // namespace wsr88d
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} // namespace scwx
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