src/cpp-common/bt2c/file-utils.cpp

   1
   2 /*
   3  * Copyright (c) 2022 Francis Deslauriers <francis.deslauriers@efficios.com>
   4  *
   5  * SPDX-License-Identifier: MIT
   6  */
   7 #include <fstream>
   8
   9 #include "logging.hpp"
  10
  11 #include "exc.hpp"
  12 #include "file-utils.hpp"
  13
  14 namespace bt2c {
  15
  16 std::vector<std::uint8_t> dataFromFile(const CStringView filePath, const Logger& logger,
  17                                        const bool fatalError)
  18 {
  19     /*
  20      * Open a file stream and seek to the end of the stream to compute the size
  21      * of the buffer required.
  22     */
  23     std::ifstream file {filePath.data(), std::ios::binary | std::ios::ate};
  24
  25     if (!file) {
  26         constexpr const char *msg = "No such file or directory: path=\"{}\"";
  27
  28         if (fatalError) {
  29             BT_CPPLOGE_APPEND_CAUSE_SPEC(logger, msg, filePath);
  30         } else {
  31             BT_CPPLOGD_SPEC(logger, msg, filePath);
  32         }
  33
  34         throw NoSuchFileOrDirectoryError {};
  35     }
  36
  37     const auto size = file.tellg();
  38     std::vector<uint8_t> buffer(static_cast<std::size_t>(size));
  39
  40     /*
  41      * Seek the reading head back at the beginning of the stream to actually
  42      * read the content.
  43      */
  44     file.seekg(0, std::ios::beg);
  45     file.read(reinterpret_cast<char *>(buffer.data()), size);
  46     return buffer;
  47 }
  48
  49 } /* namespace bt2c */