From 3136c3b239041c0b7ddc9ec54bc8bb5eb2d27a49 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Sun, 30 Aug 2020 21:27:10 +0300
Subject: [PATCH] Add an istream class that wraps raw data buffer

---
 .../include/psemek/util/memory_stream.hpp     | 31 +++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 libs/util/include/psemek/util/memory_stream.hpp

diff --git a/libs/util/include/psemek/util/memory_stream.hpp b/libs/util/include/psemek/util/memory_stream.hpp
new file mode 100644
index 00000000..03f05385
--- /dev/null
+++ b/libs/util/include/psemek/util/memory_stream.hpp
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <iostream>
+
+namespace psemek::util
+{
+
+	struct memory_istream
+		: std::istream
+	{
+		memory_istream(std::string_view data)
+			: b_(data)
+		{
+			rdbuf(&b_);
+		}
+
+	private:
+		struct buf
+			: std::streambuf
+		{
+			buf(std::string_view data)
+			{
+				char * p = const_cast<char *>(data.data());
+				setg(p, p, p + data.size());
+			}
+		};
+
+		buf b_;
+	};
+
+}