// Utilities for writing.
/// <summary>
/// Initialize the header and writer for writing. The value of fpMin and header
/// should be passed to the other utility methods here.
/// </summary>
public static void BeginWrite(BinaryWriter writer, out long fpMin, out ModelHeader header)
{
Contracts.Assert(Marshal.SizeOf(typeof(ModelHeader)) == Size);
Contracts.CheckValue(writer, nameof(writer));
fpMin = writer.FpCur();
header = default(ModelHeader);
header.Signature = SignatureValue;
header.VerWritten = VerWrittenCur;
header.VerReadable = VerReadableCur;
header.FpModel = ModelHeader.Size;
// Write a blank header - the correct information is written by WriteHeaderAndTail.
byte[] headerBytes = new byte[ModelHeader.Size];
writer.Write(headerBytes);
Contracts.CheckIO(writer.FpCur() == fpMin + ModelHeader.Size);
}
