Arithmetic operation resulted in an overflow.

What is the bug? Message: "Arithmetic operation resulted in an overflow." Stacktrace:" at SolTechnology.Avro.AvroObjectServices.Read.Reader.read(Int64 p)\r\n at SolTechnology.Avro.AvroObjectServices.Read.Reader.ReadHeader()\r\n at SolTechnology.Avro.Features.GetSchema.HeaderDecoder.GetSchema(Stream stream)\r\n at SolTechnology.Avro.AvroConvert.GetSchema(Byte[] avroBytes)"

How to reproduce? Please provide steps for reproducing the bug

use this package in c# project in windows OS with 64-bit process
run AvroConvert.GetSchema(bytes) or AvroConvert.Avro2Json(bytes) What is the Avro schema?
```
Trying to get schema from avro string
```

What is the Avro data? Fill up the section or provide a sample file

What is the expected behavior? We should get schema or json content

Findings In Reader class the below methods have long and int. Long(Int64) length is being passed as Int(Int32) parameter.

   private byte[] read(long p)
          {
              byte[] buffer = new byte[p];
              Read(buffer, 0, buffer.Length);
              return buffer;
          }

    private void Read(byte[] buffer, int start, int len)
    {
        while (len > 0)
        {
            int n = stream.Read(buffer, start, len);
            if (n <= 0) throw new EndOfStreamException();
            start += n;
            len -= n;
        }
    }

AdrianStrugala / AvroConvert

Arithmetic operation resulted in an overflow. #120