/// <summary>
/// Writes a magic header.
/// </summary>
public void WriteHeader()
{
using var sw = new BinaryWriter(_stream, Encoding.UTF8, leaveOpen: true);
// Magic
{
sw.Write('B');
sw.Write('D');
}
// QE version
{
var version = Versioning.v1;
sw.Write(version.Major);
sw.Write(version.Minor);
sw.Write(version.Build);
sw.Write(version.Revision);
}
// Flags
{
sw.Write(0);
}
// Serializer
{
var serializer = _policy.GetSerializer();
sw.Write(serializer.Name);
sw.Write(serializer.Version.Major);
sw.Write(serializer.Version.Minor);
sw.Write(serializer.Version.Build);
sw.Write(serializer.Version.Revision);
_serializer = serializer;
}
}
/// <summary>
/// Reads and asserts the magic header.
/// </summary>
public void ReadHeader()
{
using var sr = new BinaryReader(_stream, Encoding.UTF8, leaveOpen: true);
// Magic
{
var position = _stream.Position;
try
{
var b = sr.ReadChar();
var d = sr.ReadChar();
if (b != 'B' || d != 'D')
{
throw MissingHeader(position);
}
}
catch (EndOfStreamException)
{
throw MissingHeader(position);
}
}
// QE version
{
var position = _stream.Position;
try
{
var major = sr.ReadInt32();
var minor = sr.ReadInt32();
var build = sr.ReadInt32();
var revision = sr.ReadInt32();
var version = new Version(major, minor, build, revision);
if (version < Versioning.v1)
{
throw UnsupportedVersion(position, version);
}
}
catch (EndOfStreamException)
{
throw MissingVersion(position);
}
}
// Flags
{
var position = _stream.Position;
try
{
var flags = sr.ReadInt32();
}
catch (EndOfStreamException)
{
throw MissingFlags(position);
}
}
// Serializer
{
var position = _stream.Position;
try
{
var serName = sr.ReadString();
var serMajor = sr.ReadInt32();
var serMinor = sr.ReadInt32();
var serBuild = sr.ReadInt32();
var serRevision = sr.ReadInt32();
var serVersion = new Version(serMajor, serMinor, serBuild, serRevision);
_serializer = _policy.GetSerializer(serName, serVersion);
}
catch (EndOfStreamException)
{
throw MissingSerializer(position);
}
}
}
