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 "exc.hpp"
  10 #include "file-utils.hpp"
  11
  12 namespace bt2c {
  13
  14 std::vector<std::uint8_t> dataFromFile(const char * const filePath)
  15 {
  16     /*
  17      * Open a file stream and seek to the end of the stream to compute the size
  18      * of the buffer required.
  19     */
  20     std::ifstream file {filePath, std::ios::binary | std::ios::ate};
  21
  22     if (!file) {
  23         throw NoSuchFileOrDirectoryError {};
  24     }
  25
  26     const auto size = file.tellg();
  27     std::vector<uint8_t> buffer(static_cast<std::size_t>(size));
  28
  29     /*
  30      * Seek the reading head back at the beginning of the stream to actually
  31      * read the content.
  32      */
  33     file.seekg(0, std::ios::beg);
  34     file.read(reinterpret_cast<char *>(buffer.data()), size);
  35     return buffer;
  36 }
  37
  38 } /* namespace bt2c */