From afd245c205e2787e54cb7e2fd34de617eeceed25 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Mon, 15 Aug 2022 22:26:03 +0200
Subject: Add basic serialization functions for ElvData.

---
 c/data.cpp | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 c/data.h   |  4 ++++
 c/test.cpp | 26 ++++++++++++++++++++++++++
 3 files changed, 76 insertions(+)
 create mode 100644 c/data.cpp

(limited to 'c')

diff --git a/c/data.cpp b/c/data.cpp
new file mode 100644
index 0000000..e28378e
--- /dev/null
+++ b/c/data.cpp
@@ -0,0 +1,46 @@
+#include <memory>
+
+#include "data.h"
+
+template <typename T>
+inline unsigned char* ValToBuf(const T& val, unsigned char* const buf)
+{
+	memcpy(buf, &val, sizeof(val));
+	return buf+sizeof(val);
+}
+
+template <typename T>
+inline unsigned char* BufToVal(unsigned char* const buf, T& val)
+{
+	memcpy(&val, buf, sizeof(val));
+	return buf+sizeof(val);
+}
+
+unsigned char* Serialize(const ElvData& e, unsigned char* buf)
+{
+	unsigned char version = 'a';
+	buf = ValToBuf(version, buf);
+	buf = ValToBuf(e.rating, buf);
+	buf = ValToBuf(e.bWatched, buf);
+	buf = ValToBuf(e.bTVOriginal, buf);
+	buf = ValToBuf(e.sRating, buf);
+	buf = ValToBuf(e.siEp, buf);
+	buf = ValToBuf(e.title, buf);
+	return buf;
+}
+
+unsigned char* Unserialize(ElvData& e, unsigned char* buf)
+{
+	unsigned char version;
+	buf = BufToVal(buf, version);
+	if (version != 'a')
+		return nullptr;
+
+	buf = BufToVal(buf, e.rating);
+	buf = BufToVal(buf, e.bWatched);
+	buf = BufToVal(buf, e.bTVOriginal);
+	buf = BufToVal(buf, e.sRating);
+	buf = BufToVal(buf, e.siEp);
+	buf = BufToVal(buf, e.title);
+	return buf;
+}
diff --git a/c/data.h b/c/data.h
index a2b6cac..797271d 100644
--- a/c/data.h
+++ b/c/data.h
@@ -24,6 +24,10 @@ struct DlvData
 	wchar_t wiki[128] = {0};
 };
 
+constexpr size_t CB_SERIALIZE_ELVDATA = 1+sizeof(ElvData);
+unsigned char* Serialize(const ElvData& e, unsigned char* buf);
+unsigned char* Unserialize(ElvData& e, unsigned char* buf);
+
 inline int FromWeb(const int iEp, ElvData& e, DlvData& d) noexcept
 {
 	WcharPtr title, wiki, date, source, hint;
diff --git a/c/test.cpp b/c/test.cpp
index 67a32c9..1fc7e3b 100644
--- a/c/test.cpp
+++ b/c/test.cpp
@@ -46,6 +46,31 @@ TESTS
 		if (wcscmp(d.date, L"March 11, 1996") != 0)
 			FAIL("date is not correct");
 	}
+
+	TEST(Serialization)
+	{
+		ElvData e1;
+		FromProlog(6, e1);
+
+		unsigned char buf[CB_SERIALIZE_ELVDATA];
+		Serialize(e1, buf);
+
+		ElvData e2;
+		if (!Unserialize(e2, buf))
+			FAIL("invalid serialization version");
+		if (e1.rating != e2.rating)
+			FAIL("rating is different");
+		if (e1.bWatched != e2.bWatched)
+			FAIL("bWatched is different");
+		if (e1.bTVOriginal != e2.bTVOriginal)
+			FAIL("bTVOriginal is different");
+		if (wcscmp(e1.sRating, e2.sRating) != 0)
+			FAIL("sRating is different");
+		if (wcscmp(e1.siEp, e2.siEp) != 0)
+			FAIL("siEp is different");
+		if (wcscmp(e1.title, e2.title) != 0)
+			FAIL("title is different");
+	}
 };
 
 int RunTests()
@@ -54,6 +79,7 @@ int RunTests()
 		StrcpyWithSmallerDestination{},
 		//EpisodeDataFromWeb{},
 		EpisodeDataFromProlog{},
+		Serialization{},
 	};
 
 	printf("Results (%llu tests):\n", sizeof(tests)/sizeof(*tests));
-- 
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