Add new DataStream subclass of Stream, internal-only for now.

src/modules/data/DataStream.h

@@ -0,0 +1,69 @@
+/**
+ * Copyright (c) 2006-2022 LOVE Development Team
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty.  In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgment in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ **/
+
+#pragma once
+
+#include "common/Stream.h"
+
+namespace love
+{
+namespace data
+{
+
+class DataStream : public love::Stream
+{
+public:
+
+	static love::Type type;
+
+	DataStream(Data *data);
+	virtual ~DataStream();
+
+	// Implements Stream.
+	DataStream *clone() override;
+
+	bool isReadable() const override;
+	bool isWritable() const override;
+	bool isSeekable() const override;
+
+	int64 read(void* data, int64 size) override;
+	bool write(const void* data, int64 size) override;
+
+	bool flush() override;
+
+	int64 getSize() override;
+
+	bool seek(int64 pos, SeekOrigin origin = SEEKORIGIN_BEGIN) override;
+	int64 tell() override;
+
+private:
+
+	DataStream(const DataStream &other);
+
+	StrongRef<Data> data;
+	const uint8 *memory;
+	uint8 *writableMemory;
+	size_t offset;
+	size_t size;
+
+}; // DataStream
+
+} // data
+} // love