279 lines
8.2 KiB
C++
279 lines
8.2 KiB
C++
#ifndef OSRM_STORAGE_IO_HPP_
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#define OSRM_STORAGE_IO_HPP_
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#include "osrm/error_codes.hpp"
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#include "util/exception.hpp"
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#include "util/exception_utils.hpp"
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#include "util/fingerprint.hpp"
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#include "util/log.hpp"
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#include "util/version.hpp"
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#include <boost/filesystem/fstream.hpp>
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#include <boost/iostreams/seek.hpp>
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#include <cerrno>
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#include <cstring>
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#include <cstring>
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#include <tuple>
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#include <type_traits>
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namespace osrm
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{
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namespace storage
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{
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namespace io
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{
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class FileReader
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{
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public:
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class LineWrapper : public std::string
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{
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friend std::istream &operator>>(std::istream &is, LineWrapper &line)
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{
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return std::getline(is, line);
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}
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};
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auto GetLineIteratorBegin() { return std::istream_iterator<LineWrapper>(input_stream); }
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auto GetLineIteratorEnd() { return std::istream_iterator<LineWrapper>(); }
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enum FingerprintFlag
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{
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VerifyFingerprint,
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HasNoFingerprint
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};
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FileReader(const std::string &filename, const FingerprintFlag flag)
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: FileReader(boost::filesystem::path(filename), flag)
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{
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}
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FileReader(const boost::filesystem::path &filepath_, const FingerprintFlag flag)
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: filepath(filepath_), fingerprint(flag)
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{
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input_stream.open(filepath, std::ios::binary);
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// Note: filepath.string() is wrapped in std::string() because it can
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// return char * on some platforms, which makes the + operator not work
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if (!input_stream)
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throw util::RuntimeError(
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filepath.string(), ErrorCode::FileOpenError, SOURCE_REF, std::strerror(errno));
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if (flag == VerifyFingerprint && !ReadAndCheckFingerprint())
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{
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throw util::RuntimeError(filepath.string(), ErrorCode::InvalidFingerprint, SOURCE_REF);
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}
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}
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std::size_t GetSize()
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{
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const boost::filesystem::ifstream::pos_type positon = input_stream.tellg();
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input_stream.seekg(0, std::ios::end);
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const boost::filesystem::ifstream::pos_type file_size = input_stream.tellg();
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if (file_size == boost::filesystem::ifstream::pos_type(-1))
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{
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throw util::RuntimeError("Unable to determine file size for " +
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std::string(filepath.string()),
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ErrorCode::FileIOError,
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SOURCE_REF,
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std::strerror(errno));
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}
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// restore the current position
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input_stream.seekg(positon, std::ios::beg);
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if (fingerprint == FingerprintFlag::VerifyFingerprint)
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{
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return std::size_t(file_size) - sizeof(util::FingerPrint);
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}
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else
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{
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return file_size;
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}
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}
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/* Read count objects of type T into pointer dest */
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template <typename T> void ReadInto(T *dest, const std::size_t count)
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{
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#if not defined __GNUC__ or __GNUC__ > 4
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static_assert(!std::is_pointer<T>::value, "saving pointer types is not allowed");
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static_assert(std::is_trivially_copyable<T>::value,
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"bytewise reading requires trivially copyable type");
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#endif
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if (count == 0)
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return;
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const auto &result = input_stream.read(reinterpret_cast<char *>(dest), count * sizeof(T));
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const std::size_t bytes_read = input_stream.gcount();
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if (bytes_read != count * sizeof(T) && !result)
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{
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if (result.eof())
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{
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throw util::RuntimeError(
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filepath.string(), ErrorCode::UnexpectedEndOfFile, SOURCE_REF);
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}
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throw util::RuntimeError(
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filepath.string(), ErrorCode::FileReadError, SOURCE_REF, std::strerror(errno));
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}
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}
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template <typename T> void ReadInto(std::vector<T> &target)
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{
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ReadInto(target.data(), target.size());
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}
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template <typename T> void ReadInto(T &target) { ReadInto(&target, 1); }
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template <typename T> T ReadOne()
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{
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T tmp;
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ReadInto(tmp);
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return tmp;
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}
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template <typename T> void Skip(const std::size_t element_count)
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{
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boost::iostreams::seek(input_stream, element_count * sizeof(T), BOOST_IOS::cur);
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}
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/*******************************************/
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std::uint64_t ReadElementCount64() { return ReadOne<std::uint64_t>(); }
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template <typename T> std::size_t ReadVectorSize()
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{
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const auto count = ReadElementCount64();
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Skip<T>(count);
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return count;
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}
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bool ReadAndCheckFingerprint()
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{
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auto loaded_fingerprint = ReadOne<util::FingerPrint>();
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const auto expected_fingerprint = util::FingerPrint::GetValid();
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if (!loaded_fingerprint.IsValid())
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{
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throw util::RuntimeError(filepath.string(), ErrorCode::InvalidFingerprint, SOURCE_REF);
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}
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if (!expected_fingerprint.IsDataCompatible(loaded_fingerprint))
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{
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const std::string fileversion =
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std::to_string(loaded_fingerprint.GetMajorVersion()) + "." +
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std::to_string(loaded_fingerprint.GetMinorVersion()) + "." +
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std::to_string(loaded_fingerprint.GetPatchVersion());
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throw util::RuntimeError(std::string(filepath.string()) + " prepared with OSRM " +
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fileversion + " but this is " + OSRM_VERSION,
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ErrorCode::IncompatibleFileVersion,
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SOURCE_REF);
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}
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return true;
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}
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private:
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const boost::filesystem::path filepath;
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boost::filesystem::ifstream input_stream;
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FingerprintFlag fingerprint;
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};
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class FileWriter
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{
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public:
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enum FingerprintFlag
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{
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GenerateFingerprint,
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HasNoFingerprint
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};
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FileWriter(const std::string &filename, const FingerprintFlag flag)
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: FileWriter(boost::filesystem::path(filename), flag)
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{
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}
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FileWriter(const boost::filesystem::path &filepath_, const FingerprintFlag flag)
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: filepath(filepath_), fingerprint(flag)
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{
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output_stream.open(filepath, std::ios::binary);
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if (!output_stream)
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{
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throw util::RuntimeError(
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filepath.string(), ErrorCode::FileOpenError, SOURCE_REF, std::strerror(errno));
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}
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if (flag == GenerateFingerprint)
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{
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WriteFingerprint();
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}
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}
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/* Write count objects of type T from pointer src to output stream */
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template <typename T> void WriteFrom(const T *src, const std::size_t count)
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{
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#if not defined __GNUC__ or __GNUC__ > 4
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static_assert(std::is_trivially_copyable<T>::value,
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"bytewise writing requires trivially copyable type");
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#endif
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if (count == 0)
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return;
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const auto &result =
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output_stream.write(reinterpret_cast<const char *>(src), count * sizeof(T));
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if (!result)
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{
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throw util::RuntimeError(
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filepath.string(), ErrorCode::FileWriteError, SOURCE_REF, std::strerror(errno));
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}
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}
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template <typename T> void WriteFrom(const std::vector<T> &src)
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{
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WriteFrom(src.data(), src.size());
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}
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template <typename T> void WriteFrom(const T &src) { WriteFrom(&src, 1); }
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template <typename T> void WriteOne(const T &tmp) { WriteFrom(tmp); }
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void WriteElementCount64(const std::uint64_t count) { WriteOne<std::uint64_t>(count); }
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void WriteFingerprint()
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{
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const auto fingerprint = util::FingerPrint::GetValid();
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return WriteOne(fingerprint);
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}
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template <typename T> void Skip(const std::size_t element_count)
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{
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boost::iostreams::seek(output_stream, element_count * sizeof(T), BOOST_IOS::cur);
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}
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void SkipToBeginning()
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{
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boost::iostreams::seek(output_stream, 0, std::ios::beg);
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// If we wrote a Fingerprint, skip over it
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if (fingerprint == FingerprintFlag::GenerateFingerprint)
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Skip<util::FingerPrint>(1);
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// Should probably return a functor for jumping back to the current pos.
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}
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private:
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const boost::filesystem::path filepath;
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boost::filesystem::ofstream output_stream;
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FingerprintFlag fingerprint;
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};
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} // ns io
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} // ns storage
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} // ns osrm
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#endif
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