/// <summary>
/// Creates an instance of <see cref="ExcelBinaryReader"/>
/// </summary>
/// <param name="fileStream">The file stream.</param>
/// <param name="configuration">The configuration object.</param>
/// <returns>The excel data reader.</returns>
public static IExcelDataReader CreateBinaryReader(Stream fileStream, ExcelReaderConfiguration configuration = null)
{
var probe = new byte[8];
fileStream.Seek(0, SeekOrigin.Begin);
fileStream.Read(probe, 0, probe.Length);
fileStream.Seek(0, SeekOrigin.Begin);
if (CompoundDocument.IsCompoundDocument(probe))
{
var document = new CompoundDocument(fileStream);
if (TryGetWorkbook(fileStream, document, out var stream))
{
return(new ExcelBinaryReader(stream, configuration));
}
else
{
throw new ExcelReaderException(Errors.ErrorStreamWorkbookNotFound);
}
}
else if (XlsWorkbook.IsRawBiffStream(probe))
{
return(new ExcelBinaryReader(fileStream, configuration));
}
else
{
throw new HeaderException(Errors.ErrorHeaderSignature);
}
}
/// <summary>
/// Creates an instance of <see cref="ExcelBinaryReader"/> or <see cref="ExcelOpenXmlReader"/>
/// </summary>
/// <param name="fileStream">The file stream.</param>
/// <param name="configuration">The configuration object.</param>
/// <returns>The excel data reader.</returns>
public static IExcelDataReader CreateReader(Stream fileStream, ExcelReaderConfiguration configuration = null)
{
if (configuration == null)
{
configuration = new ExcelReaderConfiguration();
}
if (configuration.LeaveOpen)
{
fileStream = new LeaveOpenStream(fileStream);
}
var probe = new byte[8];
fileStream.Seek(0, SeekOrigin.Begin);
fileStream.Read(probe, 0, probe.Length);
fileStream.Seek(0, SeekOrigin.Begin);
if (CompoundDocument.IsCompoundDocument(probe))
{
// Can be BIFF5-8 or password protected OpenXml
var document = new CompoundDocument(fileStream);
if (TryGetWorkbook(fileStream, document, out var stream))
{
return(new ExcelBinaryReader(stream, configuration.Password, configuration.FallbackEncoding));
}
else if (TryGetEncryptedPackage(fileStream, document, configuration.Password, out stream))
{
return(new ExcelOpenXmlReader(stream));
}
else
{
throw new ExcelReaderException(Errors.ErrorStreamWorkbookNotFound);
}
}
else if (XlsWorkbook.IsRawBiffStream(probe))
{
return(new ExcelBinaryReader(fileStream, configuration.Password, configuration.FallbackEncoding));
}
else if (probe[0] == 0x50 && probe[1] == 0x4B)
{
// zip files start with 'PK'
return(new ExcelOpenXmlReader(fileStream));
}
else
{
throw new HeaderException(Errors.ErrorHeaderSignature);
}
}
/// <summary>
/// Creates an instance of <see cref="ExcelBinaryReader"/> or <see cref="ExcelOpenXmlReader"/>
/// </summary>
/// <param name="fileStream">The file stream.</param>
/// <param name="configuration">The configuration object.</param>
/// <returns>The excel data reader.</returns>
public static IExcelDataReader CreateReader(Stream fileStream, ExcelReaderConfiguration configuration = null)
{
var probe = new byte[8];
fileStream.Read(probe, 0, probe.Length);
fileStream.Seek(0, SeekOrigin.Begin);
if (XlsWorkbook.IsCompoundDocument(probe) || XlsWorkbook.IsRawBiffStream(probe))
{
return(CreateBinaryReader(fileStream, configuration));
}
// zip files start with 'PK'
if (probe[0] == 0x50 && probe[1] == 0x4B)
{
return(CreateOpenXmlReader(fileStream, configuration));
}
throw new NotSupportedException("Unknown file format");
}