/// <summary>
/// Updates the tag instance's state from a block of tag data.
/// </summary>
/// <param name="data">The tag data.</param>
/// <param name="dataOffset">The offset of the tag data relative to the tag instance's header.</param>
internal void Update(CachedTagData data, uint dataOffset)
{
Group = data.Group;
Offset = data.MainStructOffset + dataOffset;
Dependencies = new ReadOnlySet <int>(new HashSet <int>(data.Dependencies));
_pointerOffsets = data.PointerFixups.Select(fixup => fixup.WriteOffset + dataOffset).ToList();
_resourceOffsets = data.ResourcePointerOffsets.Select(offset => offset + dataOffset).ToList();
_tagReferenceOffsets = data.TagReferenceOffsets.Select(offset => offset + dataOffset).ToList();
}
/// <summary>
/// Calculates the header size that would be needed for a given block of tag data.
/// </summary>
/// <param name="data">The descriptor to use.</param>
/// <returns>The size of the tag's header.</returns>
internal static uint CalculateHeaderSize(CachedTagData data) =>
(uint)(TagHeaderSize +
data.Dependencies.Count * 4 +
data.PointerFixups.Count * 4 +
data.ResourcePointerOffsets.Count * 4 +
data.TagReferenceOffsets.Count * 4);