/// <summary>
/// Detects the format of the Reader input, and if known, it will return
/// a CDK Reader to read the format, or null when the reader is not
/// implemented.
/// </summary>
/// <param name="input"></param>
/// <returns><see langword="null"/> if CDK does not contain a reader for the detected format.</returns>
/// <seealso cref="CreateReader(TextReader)"/>
public ISimpleChemObjectReader CreateReader(Stream input)
{
IChemFormat format = null;
ISimpleChemObjectReader reader = null;
if (input is GZipStream)
{
var istreamToRead = new ReadSeekableStream(input, 65536);
format = formatFactory.GuessFormat(istreamToRead);
var type = GetReaderType(format);
if (type != null)
{
try
{
reader = (ISimpleChemObjectReader)type.GetConstructor(new Type[] { typeof(Stream) }).Invoke(new object[] { istreamToRead });
}
catch (CDKException e1)
{
var wrapper = new IOException("Exception while setting the Stream: " + e1.Message, e1);
throw wrapper;
}
}
}
else
{
var bistream = input;
var istreamToRead = bistream; // if gzip test fails, then take default
// bistream.Mark(5);
int countRead = 0;
var abMagic = new byte[4];
countRead = bistream.Read(abMagic, 0, 4);
bistream.Seek(0, SeekOrigin.Begin);
if (countRead == 4)
{
if (abMagic[0] == (byte)0x1F && abMagic[1] == (byte)0x8B)
{
istreamToRead = new GZipStream(bistream, CompressionMode.Decompress);
return(CreateReader(istreamToRead));
}
}
format = formatFactory.GuessFormat(istreamToRead);
var type = GetReaderType(format);
if (type != null)
{
try
{
reader = (ISimpleChemObjectReader)type.GetConstructor(new Type[] { typeof(Stream) }).Invoke(new object[] { istreamToRead });
}
catch (CDKException e1)
{
var wrapper = new IOException("Exception while setting the Stream: " + e1.Message, e1);
throw wrapper;
}
}
}
return(reader);
}
private static void ExpectFormat(string filename, IResourceFormat expectedFormat)
{
var ins = ResourceLoader.GetAsStream(filename);
Assert.IsNotNull(ins, $"Cannot find file: {filename}");
if (expectedFormat is IChemFormatMatcher)
{
factory.RegisterFormat((IChemFormatMatcher)expectedFormat);
}
ins = new BufferedStream(ins);
IChemFormat format = factory.GuessFormat(ins);
Assert.IsNotNull(format);
Assert.AreEqual(expectedFormat.FormatName, format.FormatName);
}