Add unpacktool

unpacktool/IFileReader.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <stdint.h>
+
+struct IFileReader
+{
+public:
+	typedef int64_t FilePos_t;
+	typedef uint64_t UFilePos_t;
+
+	virtual size_t Read(void *buffer, size_t sz) = 0;
+	virtual size_t FileSize() const = 0;
+	virtual bool SeekStart(FilePos_t pos) = 0;
+	virtual bool SeekCurrent(FilePos_t pos) = 0;
+	virtual bool SeekEnd(FilePos_t pos) = 0;
+	virtual FilePos_t GetPosition() const = 0;
+
+	inline bool ReadExact(void *buffer, size_t sz)
+	{
+		return this->Read(buffer, sz) == sz;
+	}
+};