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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace OpenSubtitlesHandler
{
public class MovieHasher
{
public static byte[] ComputeMovieHash(string filename)
{
byte[] result;
using (Stream input = File.OpenRead(filename))
{
result = ComputeMovieHash(input);
}
return result;
}
private static byte[] ComputeMovieHash(Stream input)
{
long lhash, streamsize;
streamsize = input.Length;
lhash = streamsize;
long i = 0;
byte[] buffer = new byte[sizeof(long)];
while (i < 65536 / sizeof(long) && (input.Read(buffer, 0, sizeof(long)) > 0))
{
i++;
lhash += BitConverter.ToInt64(buffer, 0);
}
input.Position = Math.Max(0, streamsize - 65536);
i = 0;
while (i < 65536 / sizeof(long) && (input.Read(buffer, 0, sizeof(long)) > 0))
{
i++;
lhash += BitConverter.ToInt64(buffer, 0);
}
input.Close();
byte[] result = BitConverter.GetBytes(lhash);
Array.Reverse(result);
return result;
}
public static string ToHexadecimal(byte[] bytes)
{
StringBuilder hexBuilder = new StringBuilder();
for (int i = 0; i < bytes.Length; i++)
{
hexBuilder.Append(bytes[i].ToString("x2"));
}
return hexBuilder.ToString();
}
}
}
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