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DependentExtensions/cat/io/MMapFile.hpp

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+/*
+	Copyright (c) 2009-2010 Christopher A. Taylor.  All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	* Redistributions of source code must retain the above copyright notice,
+	  this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above copyright notice,
+	  this list of conditions and the following disclaimer in the documentation
+	  and/or other materials provided with the distribution.
+	* Neither the name of LibCat nor the names of its contributors may be used
+	  to endorse or promote products derived from this software without
+	  specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+	ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+	POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef CAT_MMAPFILE_HPP
+#define CAT_MMAPFILE_HPP
+
+#include <cat/Platform.hpp>
+
+#if defined(CAT_OS_WINDOWS)
+# include <cat/port/WindowsInclude.hpp>
+#endif
+
+namespace cat {
+
+
+class MMapFile
+{
+    char *data;
+    u32 len;
+    s32 offset;
+
+#if defined(CAT_OS_LINUX)
+    int fd;
+#elif defined(CAT_OS_WINDOWS)
+    HANDLE hFile, hMapping;
+#endif
+
+public:
+    MMapFile(const char *path);
+    ~MMapFile();
+
+    inline bool good() { return data != 0; }
+    inline bool inside() { return offset >= 0 && offset < (s32)len; }
+
+    inline u32 size() { return len; }
+
+    inline void seek(s32 poffset) { offset = poffset; }
+    inline bool underrun(s32 requested) { return (u32)(offset + requested) > len; }
+    inline char *look() { return data + offset; }
+    inline char *look(s32 offset) { return data + offset; }
+    inline char *read(s32 requested) { offset += requested; return data + (offset - requested); }
+    inline void skip(s32 requested) { offset += requested; }
+    inline u32 remaining() { return len - offset; }
+    inline u32 getOffset() { return offset; }
+};
+
+
+} // namespace cat
+
+#endif // CAT_MMAPFILE_HPP