/// <exception cref="System.IO.IOException"/>
protected internal override InputStream GetInputStream(PathData item)
{
FSDataInputStream i = (FSDataInputStream)base.GetInputStream(item);
// Handle 0 and 1-byte files
short leadBytes;
try
{
leadBytes = i.ReadShort();
}
catch (EOFException)
{
i.Seek(0);
return(i);
}
switch (leadBytes)
{
case unchecked ((int)(0x1f8b)):
{
// Check type of stream first
// RFC 1952
// Must be gzip
i.Seek(0);
return(new GZIPInputStream(i));
}
case unchecked ((int)(0x5345)):
{
// 'S' 'E'
// Might be a SequenceFile
if (i.ReadByte() == 'Q')
{
i.Close();
return(new Display.TextRecordInputStream(this, item.stat));
}
goto default;
}
default:
{
// Check the type of compression instead, depending on Codec class's
// own detection methods, based on the provided path.
CompressionCodecFactory cf = new CompressionCodecFactory(GetConf());
CompressionCodec codec = cf.GetCodec(item.path);
if (codec != null)
{
i.Seek(0);
return(codec.CreateInputStream(i));
}
break;
}
case unchecked ((int)(0x4f62)):
{
// 'O' 'b'
if (i.ReadByte() == 'j')
{
i.Close();
return(new Display.AvroFileInputStream(item.stat));
}
break;
}
}
// File is non-compressed, or not a file container we know.
i.Seek(0);
return(i);
}
