Add support for map block version 29

include/ZstdDecompressor.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <cstdlib>
+#include <string>
+#include "types.h"
+
+class ZstdDecompressor
+{
+public:
+	class DecompressError {};
+
+	ZstdDecompressor();
+	~ZstdDecompressor();
+	void setData(const u8 *data, size_t size, size_t seekPos);
+	size_t seekPos() const;
+	ustring decompress();
+
+private:
+	void *m_stream; // ZSTD_DStream
+	const u8 *m_data;
+	size_t m_seekPos, m_size;
+};