Ricoh thetaのJPGから角度を取り出すコード

RICOH SHETAから角度を取り出すコード@C#版
MIROさんから頂いたコードを元に改造しました。
UNITYで使用することを前提にしています。

ViewPict.cs

using UnityEngine;
using System.Collections;
using System.IO;

public class ViewPict : MonoBehaviour 
{
	static int SerchAngle(string fileName)
	{
		BinaryReader br = new BinaryReader(new FileStream("Assets/Resources/" + fileName+".jpg", FileMode.Open));
		byte [] buf = br.ReadBytes((int)br.BaseStream.Length );
		br.Close();
		br = null;
		
		int ix;
		int offset;
		float compass;
		float zenith_x;
		float zenith_y;



		// check EXIF
		// find CompassEs
		ix = find_data(buf,new byte[] {0x00,0x04,0x00,0x05,0x00,0x00,0x00,0x01});
		if (ix<0) 
		{
			return -1; 
		}
		offset = get_dword(buf,ix)+12;
		compass = parse_u_rational(buf,offset);

		// find ZenithEs
		ix = find_data(buf,new byte[] {0x00,0x03,0x00,0x0A,0x00,0x00,0x00,0x02});
		if (ix<0) 
		{
			return -1;
		}
		offset = get_dword(buf,ix)+12;
		zenith_x = parse_u_rational(buf,offset  );
		zenith_y = parse_u_rational(buf,offset+8);

		Debug.Log( "1:" + zenith_y.ToString() + ",2:" + zenith_x.ToString());
		return 0; 
		//sphere.transform.Rotate(0,0,-zenith_y);
		//sphere.transform.Rotate(zenith_x,0,0);
	}

	static int find_data(byte[] buf, byte[] pattern)
	{
		int max;

		max = buf.Length;
		
		if (max>64*1000) 
		{ 
			max = 64*1000; 
		}


		for (int i = 0; i < max; i++)
		{
			int iTemp = i;
			for (int p = 0; p < pattern.Length ; p++, iTemp++)
			{
				if (pattern[p] != buf[iTemp] || iTemp >= max)
				{
					break;
				}

				if (p == pattern.Length - 1)
				{
					return iTemp + 1;
				}
			}
		}

		return -1;
	}

	static int get_dword(byte[] buf, int offset)
	{

		return (buf[offset]<<24) | (buf[offset+1]<<16) | (buf[offset+2]<<8) | buf[offset+3];
	}

	static float parse_u_rational(byte[] buf, int offset) 
	{
		float a;
		float b;
		a = get_dword(buf,offset  );
		b = get_dword(buf,offset+4);
		return a/b;
	}
}