/// <summary>
/// Read the tag from the supplied I\O stream
/// </summary>
public void Read()
{
if (InputStream == null)
{
Debug.Assert.If(false, "Tried to read a tag that we didn't open. {0}:{1}", engine, this.Path);
}
if (engine == BlamVersion.Unknown)
{
CalculateVersion();
}
ReadPreprocess();
bool needs_upgrading = false;
// Read past the tag field set header of the tag group
if (DefinitionState.FieldSetRequiresVersioningHeader(this))
{
IFieldSetVersioning fs = tagDefinition.State.FieldSetReadVersion(this, FieldType.Tag, InputStream.PositionUnsigned);
if (needs_upgrading = fs.NeedsUpgrading)
{
int index, size_of;
fs.GetUpgradeParameters(out index, out size_of);
if (!fs.UseImplicitUpgrading)
{
tagDefinition = tagDefinition.NewInstance((tagDefinition as IStructureOwner).OwnerObject, index, size_of);
flags.Add(IO.ITagStreamFlags.DefinitionWasUpgraded);
}
else
{
tagDefinition.VersionImplicitUpgradeBegin(size_of, this);
}
}
}
tagDefinition.Read(this);
if (needs_upgrading)
{
if (tagDefinition.VersionImplicitUpgradeIsActive)
{
tagDefinition.VersionImplicitUpgradeEnd();
}
else
{
#if DEBUG
if (!tagDefinition.Upgrade())
{
Debug.Assert.If(false, "Failed to upgrade tag group. {0} {1}", tagDefinition.GetType().Name, tagDefinition.ToVersionString());
}
#else
tagDefinition.Upgrade();
#endif
}
}
}
void WriteImpl()
{
WritePreprocess();
// Write the tag field set header for the tag group
if (DefinitionState.FieldSetRequiresVersioningHeader(this))
{
tagDefinition.State.FieldSetWriteVersion(this, FieldType.Tag);
}
if (!tagDefinition.PostProcessGroup(false))
{
Debug.Warn.If(false, "{0} failed to postprocess. {1}.{2}", tagDefinition.GetType().FullName, this.Name, this.tagGroup.Name);
}
tagDefinition.Write(this);
}
