1 files changed, 15 insertions, 3 deletions
diff --git a/utils/helpers/file.hpp b/utils/helpers/file.hpp
index a327c35..febe98f 100644
--- a/utils/helpers/file.hpp
+++ b/utils/helpers/file.hpp
@@ -3,10 +3,12 @@
 // For details, see https://github.com/egor-tensin/aes-tools.
 // Distributed under the MIT License.
 
+#include <cassert>
 #include <cstddef>
 
 #include <fstream>
 #include <iterator>
+#include <limits>
 #include <string>
 #include <vector>
 
@@ -17,7 +19,9 @@ namespace file
         std::ifstream ifs;
         ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
         ifs.open(path, std::ifstream::binary | std::ifstream::ate);
-        return ifs.tellg();
+        const auto size = static_cast<std::streamoff>(ifs.tellg());
+        assert(size <= static_cast<std::streamoff>(std::numeric_limits<std::size_t>::max()));
+        return static_cast<std::size_t>(size);
     }
 
     inline std::vector<char> read_file(const std::string& path)
@@ -38,11 +42,19 @@ namespace file
 
     inline void write_file(
         const std::string& path,
-        const std::vector<unsigned char>& src)
+        const void* buffer,
+        const std::size_t size)
     {
         std::ofstream ofs;
         ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
         ofs.open(path, std::ofstream::binary);
-        ofs.write(reinterpret_cast<const char*>(src.data()), src.size());
+        ofs.write(reinterpret_cast<const char*>(buffer), size);
+    }
+
+    inline void write_file(
+        const std::string& path,
+        const std::vector<unsigned char>& src)
+    {
+        write_file(path, src.data(), src.size());
     }
 }