1 files changed, 69 insertions, 0 deletions
diff --git a/aesxx/utils/helpers/file.hpp b/aesxx/utils/helpers/file.hpp
new file mode 100644
index 0000000..48e4c51
--- /dev/null
+++ b/aesxx/utils/helpers/file.hpp
@@ -0,0 +1,69 @@
+// Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "AES tools" project.
+// For details, see https://github.com/egor-tensin/aes-tools.
+// Distributed under the MIT License.
+
+#include <cstddef>
+
+#include <fstream>
+#include <iterator>
+#include <limits>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+namespace file
+{
+    inline std::size_t cast_to_size_t(std::streamoff size)
+    {
+        if (size < 0)
+            throw std::range_error{"file::cast_to_size_t: something went really wrong"};
+        typedef std::make_unsigned<std::streamoff>::type unsigned_streamoff;
+        if (static_cast<unsigned_streamoff>(size) > std::numeric_limits<std::size_t>::max())
+            throw std::range_error{"file::cast_to_size_t: this file is too large"};
+        return static_cast<std::size_t>(size);
+    }
+
+    inline std::size_t get_file_size(const std::string& path)
+    {
+        std::ifstream ifs;
+        ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
+        ifs.open(path, std::ifstream::binary | std::ifstream::ate);
+        return cast_to_size_t(ifs.tellg());
+    }
+
+    inline std::vector<char> read_file(const std::string& path)
+    {
+        const auto size = get_file_size(path);
+
+        std::ifstream ifs;
+        ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
+        ifs.open(path, std::ifstream::binary);
+
+        std::vector<char> src_buf;
+        src_buf.reserve(size);
+        src_buf.assign(
+            std::istreambuf_iterator<char>{ifs},
+            std::istreambuf_iterator<char>{});
+        return src_buf;
+    }
+
+    inline void write_file(
+        const std::string& path,
+        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*>(buffer), size);
+    }
+
+    inline void write_file(
+        const std::string& path,
+        const std::vector<unsigned char>& src)
+    {
+        write_file(path, src.data(), src.size());
+    }
+}