diff --git a/src/file_handling.cpp b/src/file_handling.cpp
new file mode 100644
index 0000000..529e9f2
--- /dev/null
+++ b/src/file_handling.cpp
@@ -0,0 +1,59 @@
+#include <iostream>
+#include <fcntl.h>
+#include <unistd.h>
+
+using namespace std::string_literals;
+std::system_error errnoException(const std::string& message)
+{
+    return std::system_error(errno, std::generic_category(), message);
+}
+
+int sysopen(const std::string& path)
+{
+    int fd_ = open(path.c_str(), O_RDWR);
+    if (fd_ < 0)
+    {
+        throw errnoException("Error opening file "s + path);
+    }
+    return fd_;
+}
+
+void sysclose(int fd_)
+{
+    close(fd_);
+}
+
+void lseeker(int fd_, size_t offset)
+{
+    if (lseek(fd_, offset, SEEK_SET) < 0)
+    {
+        throw errnoException("Cannot lseek to pos "s + std::to_string(offset));
+    }
+}
+
+void readBin(int fd_, size_t offset, void *ptr, size_t size)
+{
+    lseeker(fd_, offset);
+    size_t ret = read(fd_, ptr, size);
+    if(ret < 0 )
+    {
+        throw errnoException("Error reading from file"s);
+    }
+}
+
+void writeBin(int fd_, size_t offset, void *ptr, size_t size)
+{
+    lseeker(fd_, offset);
+    ssize_t ret;
+    ret = write(fd_, ptr, size);
+    if (ret < 0)
+    {
+        throw errnoException("Error writing to file"s);
+    }
+    if (static_cast<size_t>(ret) != size)
+    {
+        throw std::runtime_error(
+                "Tried to send data size "s + std::to_string(size) +
+                " but could only send "s + std::to_string(ret));
+    }
+}