diff --git a/analyzer/util.hpp b/analyzer/util.hpp
new file mode 100644
index 0000000..de7c404
--- /dev/null
+++ b/analyzer/util.hpp
@@ -0,0 +1,37 @@
+#pragma once
+
+/**
+ * @brief Specially utilities that are specific to the analyzer (typically
+ *        stuff that involves libhei).
+ */
+
+#include <hei_main.hpp>
+#include <util/bin_stream.hpp>
+
+namespace util
+{
+
+/** @brief Extracts big-endian data to host RegisterId_t. */
+template <>
+inline BinFileReader& BinFileReader::operator>>(libhei::RegisterId_t& r)
+{
+    // A register ID is only 3 bytes, but there isn't a 3-byte integer type.
+    // So extract 3 bytes to a uint32_t and drop the unused byte.
+    uint32_t tmp = 0;
+    read(&tmp, 3);
+    r = static_cast<libhei::RegisterId_t>(be32toh(tmp) >> 8);
+    return *this;
+}
+
+/** @brief Inserts host RegisterId_t to big-endian data. */
+template <>
+inline BinFileWriter& BinFileWriter::operator<<(libhei::RegisterId_t r)
+{
+    // A register ID is only 3 bytes, but there isn't a 3-byte integer type.
+    // So extract 3 bytes to a uint32_t and drop the unused byte.
+    uint32_t tmp = htobe32(static_cast<uint32_t>(r) << 8);
+    write(&tmp, 3);
+    return *this;
+}
+
+} // namespace util