public void TestDetectAsPOIFS()
{
Stream in1;
// ooxml file is
in1 = new PushbackStream(
HSSFTestDataSamples.OpenSampleFileStream("SampleSS.xlsx")
);
Assert.IsTrue(POIXMLDocument.HasOOXMLHeader(in1));
in1.Close();
// xls file isn't
in1 = new PushbackStream(
HSSFTestDataSamples.OpenSampleFileStream("SampleSS.xls")
);
Assert.IsFalse(POIXMLDocument.HasOOXMLHeader(in1));
in1.Close();
// text file isn't
in1 = new PushbackStream(
HSSFTestDataSamples.OpenSampleFileStream("SampleSS.txt")
);
Assert.IsFalse(POIXMLDocument.HasOOXMLHeader(in1));
in1.Close();
}
/**
* Takens an InputStream, verifies that it's not RTF, builds a
* POIFSFileSystem from it, and returns that.
*/
public static POIFSFileSystem VerifyAndBuildPOIFS(Stream istream)
{
// Open a PushbackInputStream, so we can peek at the first few bytes
PushbackStream pis = new PushbackStream(istream);
byte[] first6 = new byte[6];
pis.Read(first6, 0, 6);
// Does it start with {\rtf ? If so, it's really RTF
if (first6[0] == '{' && first6[1] == '\\' && first6[2] == 'r'
&& first6[3] == 't' && first6[4] == 'f')
{
throw new ArgumentException("The document is really a RTF file");
}
// OK, so it's not RTF
// Open a POIFSFileSystem on the (pushed back) stream
pis.Unread(6);
return new POIFSFileSystem(istream);
}
/// <summary>
/// Creates the appropriate HSSFWorkbook / XSSFWorkbook from
/// the given InputStream. The Stream is wraped inside a PushbackInputStream.
/// </summary>
/// <param name="inputStream">Input Stream of .xls or .xlsx file</param>
/// <returns>IWorkbook depending on the input HSSFWorkbook or XSSFWorkbook is returned.</returns>
// Your input stream MUST either support mark/reset, or
// be wrapped as a {@link PushbackInputStream}!
public static IWorkbook Create(Stream inputStream)
{
// If Clearly doesn't do mark/reset, wrap up
//if (!inp.MarkSupported())
//{
// inp = new PushbackInputStream(inp, 8);
//}
inputStream = new PushbackStream(inputStream);
if (POIFSFileSystem.HasPOIFSHeader(inputStream))
{
return new HSSFWorkbook(inputStream);
}
inputStream.Position = 0;
if (POIXMLDocument.HasOOXMLHeader(inputStream))
{
return new XSSFWorkbook(OPCPackage.Open(inputStream));
}
throw new ArgumentException("Your InputStream was neither an OLE2 stream, nor an OOXML stream.");
}
