init repo

ActiveX/Common/OfficeDrawing/BinaryReader.h

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+/*
+ * (c) Copyright Ascensio System SIA 2010-2014
+ *
+ * This program is a free software product. You can redistribute it and/or 
+ * modify it under the terms of the GNU Affero General Public License (AGPL) 
+ * version 3 as published by the Free Software Foundation. In accordance with 
+ * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect 
+ * that Ascensio System SIA expressly excludes the warranty of non-infringement
+ * of any third-party rights.
+ *
+ * This program is distributed WITHOUT ANY WARRANTY; without even the implied 
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For 
+ * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
+ *
+ * You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
+ * EU, LV-1021.
+ *
+ * The  interactive user interfaces in modified source and object code versions
+ * of the Program must display Appropriate Legal Notices, as required under 
+ * Section 5 of the GNU AGPL version 3.
+ *
+ * Pursuant to Section 7(b) of the License you must retain the original Product
+ * logo when distributing the program. Pursuant to Section 7(e) we decline to
+ * grant you any rights under trademark law for use of our trademarks.
+ *
+ * All the Product's GUI elements, including illustrations and icon sets, as
+ * well as technical writing content are licensed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International. See the License
+ * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
+ *
+ */
+ #pragma once
+
+namespace NSOfficeDrawing
+{
+	#define BINARY_READER_CHECK_OUT_RANGE(index, count)     \
+	if (index > count)										\
+	{														\
+		index = count;										\
+		return 0;											\
+	}
+
+	class CBinaryReader
+	{
+	private:
+		BYTE* m_pBuffer;
+		DWORD m_lCount;
+
+		DWORD m_lOrigin;
+
+	public:
+		CBinaryReader(BYTE* pBuffer, DWORD lCount)
+		{
+			m_pBuffer = pBuffer;
+			m_lCount = lCount;
+
+			m_lOrigin = 0;
+		}
+		~CBinaryReader()
+		{
+			m_pBuffer = NULL;
+			m_lCount = 0;
+		}
+
+	public:
+		LONG ReadLONG()
+		{
+			DWORD lOldOrigin = m_lOrigin;
+			m_lOrigin += 4;
+
+			BINARY_READER_CHECK_OUT_RANGE(m_lOrigin, m_lCount)
+
+			return *(LONG*)(m_pBuffer + lOldOrigin);
+		}
+		DWORD ReadDWORD()
+		{
+			DWORD lOldOrigin = m_lOrigin;
+			m_lOrigin += 4;
+
+			BINARY_READER_CHECK_OUT_RANGE(m_lOrigin, m_lCount)
+
+			return *(DWORD*)(m_pBuffer + lOldOrigin);
+		}
+		WORD ReadWORD()
+		{
+			DWORD lOldOrigin = m_lOrigin;
+			m_lOrigin += 2;
+
+			BINARY_READER_CHECK_OUT_RANGE(m_lOrigin, m_lCount)
+
+			return *(WORD*)(m_pBuffer + lOldOrigin);
+		}
+		SHORT ReadSHORT()
+		{
+			DWORD lOldOrigin = m_lOrigin;
+			m_lOrigin += 2;
+
+			BINARY_READER_CHECK_OUT_RANGE(m_lOrigin, m_lCount)
+
+			return *(SHORT*)(m_pBuffer + lOldOrigin);
+		}
+		double ReadDOUBLE()
+		{
+			DWORD lOldOrigin = m_lOrigin;
+			m_lOrigin += sizeof(double);
+
+			BINARY_READER_CHECK_OUT_RANGE(m_lOrigin, m_lCount)
+
+			return *(SHORT*)(m_pBuffer + lOldOrigin);
+		}
+	};
+}