I have a cache file using Avro serialization, and I want to add a magic
byte indicating cache version at the beginning of the file.
I find it's easy to serialize, but difficult to deserialize in C#.
First I open a filestream, read my magic byte, and then pass the stream to
the DataFileReader:
var reader = DataFileReader<Dictionary<string,
MyType>>.OpenReader(stream, CACHE_SCHEMA)
but it throws an AvroRuntimeException("Not an Avro data file")
I look into the OpenReader() method:
// verify magic header
byte[] magic = new byte[DataFileConstants.Magic.Length];
inStream.Seek(0, SeekOrigin.Begin);
It will always seek back to the beginning of the FileStream (which includes
my own byte), and thus throws an Exception.
However, in java version, I could use DataFileStream which wouldn't
seek back and it works.
Is there a way to make it work in C# version? I also wonder why there
isn't an equivalent "DataFileStream" class in C#.
