Add love.data module.

- Moved love.math.compress / decompress / decode / encode / hash to love.data.
- Changed love.data.compress/decompress to take the format argument first instead of second.
- Added love.data.newDataView. Returns a read-only subsection of an existing Data object.
- Added love.data.newByteData. Mostly useful in combination with LuaJIT's FFI as it has no extra methods currently.
- Added implementations of Lua 5.3's data packing APIs: love.data.packString / packData / unpack / getPackedSize.

Resolves issue #1336.
Resolves issue #1331.

--HG--
branch : minor

src/modules/data/CompressedData.cpp

@@ -0,0 +1,103 @@
+/**
+ * Copyright (c) 2006-2017 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.
+ **/
+
+// LOVE
+#include "CompressedData.h"
+
+namespace love
+{
+namespace data
+{
+
+love::Type CompressedData::type("CompressedData", &Data::type);
+
+CompressedData::CompressedData(Compressor::Format format, char *cdata, size_t compressedsize, size_t rawsize, bool own)
+	: format(format)
+	, data(nullptr)
+	, dataSize(compressedsize)
+	, originalSize(rawsize)
+{
+	if (own)
+		data = cdata;
+	else
+	{
+		try
+		{
+			data = new char[dataSize];
+		}
+		catch (std::bad_alloc &)
+		{
+			throw love::Exception("Out of memory.");
+		}
+
+		memcpy(data, cdata, dataSize);
+	}
+}
+
+CompressedData::CompressedData(const CompressedData &c)
+	: format(c.format)
+	, data(nullptr)
+	, dataSize(c.dataSize)
+	, originalSize(c.originalSize)
+{
+	try
+	{
+		data = new char[dataSize];
+	}
+	catch (std::bad_alloc &)
+	{
+		throw love::Exception("Out of memory.");
+	}
+
+	memcpy(data, c.data, dataSize);
+}
+
+CompressedData::~CompressedData()
+{
+	delete[] data;
+}
+
+CompressedData *CompressedData::clone() const
+{
+	return new CompressedData(*this);
+}
+
+Compressor::Format CompressedData::getFormat() const
+{
+	return format;
+}
+
+size_t CompressedData::getDecompressedSize() const
+{
+	return originalSize;
+}
+
+void *CompressedData::getData() const
+{
+	return data;
+}
+
+size_t CompressedData::getSize() const
+{
+	return dataSize;
+}
+
+} // data
+} // love