/**
* Reads the header information from the passed in stream and returns it. It also returns
* a BinaryReader that is endian-appropriate for the data stream.
*
* @param ParserStream source stream of data to read from
* @param BinaryStream [out] binary reader used for reading from stream
* @return serialized header
*/
public static StreamHeader ReadHeader(Stream ParserStream, out BinaryReader BinaryStream)
{
// Create a binary stream for data, we might toss this later for are an endian swapping one.
BinaryStream = new BinaryReader(ParserStream, System.Text.Encoding.ASCII);
// Serialize header.
StreamHeader Header = new StreamHeader(BinaryStream);
// Determine whether read file has magic header. If no, try again byteswapped.
if (Header.Magic != StreamHeader.ExpectedMagic)
{
// Seek back to beginning of stream before we retry.
ParserStream.Seek(0, SeekOrigin.Begin);
// Use big endian reader. It transparently endian swaps data on read.
BinaryStream = new BinaryReaderBigEndian(ParserStream);
// Serialize header a second time.
Header = new StreamHeader(BinaryStream);
}
// At this point we should have a valid header. If no, throw an exception.
if (Header.Magic != StreamHeader.ExpectedMagic)
{
ShowDialog("Error", "Unrecognized file");
throw new InvalidDataException();
}
if (Header.Version != StreamHeader.ExpectedVersion)
{
ShowDialog("Error", "Invalid version");
throw new InvalidDataException();
}
return(Header);
}
/**
* Reads the header information from the passed in stream and returns it. It also returns
* a BinaryReader that is endian-appropriate for the data stream.
*
* @param ParserStream source stream of data to read from
* @param BinaryStream [out] binary reader used for reading from stream
* @return serialized header
*/
public static StreamHeader ReadHeader( Stream ParserStream, out BinaryReader BinaryStream )
{
// Create a binary stream for data, we might toss this later for are an endian swapping one.
BinaryStream = new BinaryReader(ParserStream,System.Text.Encoding.ASCII);
// Serialize header.
StreamHeader Header = new StreamHeader(BinaryStream);
// Determine whether read file has magic header. If no, try again byteswapped.
if(Header.Magic != StreamHeader.ExpectedMagic)
{
// Seek back to beginning of stream before we retry.
ParserStream.Seek(0,SeekOrigin.Begin);
// Use big endian reader. It transparently endian swaps data on read.
BinaryStream = new BinaryReaderBigEndian(ParserStream);
// Serialize header a second time.
Header = new StreamHeader(BinaryStream);
}
// At this point we should have a valid header. If no, throw an exception.
if( Header.Magic != StreamHeader.ExpectedMagic )
{
ShowDialog( "Error", "Unrecognized file" );
throw new InvalidDataException();
}
if ( Header.Version != StreamHeader.ExpectedVersion )
{
ShowDialog( "Error", "Invalid version" );
throw new InvalidDataException();
}
return Header;
}
