/// <summary>
/// Diff the 2 root files.
/// Completely taken from https://github.com/Marlamin/CASCToolHost/blob/master/CASCToolHost/Controllers/RootController.cs#L59
/// </summary>
/// <param name="oldRoot"></param>
/// <param name="newRoot"></param>
public static IEnumerable <RootEntry> DiffRoot(string oldRootHash, string newRootHash)
{
try
{
var oldRootStream = BuildMonitor.RequestCDN($"tpr/wow/data/{oldRootHash.Substring(0, 2)}/{oldRootHash.Substring(2, 2)}/{oldRootHash}");
var newRootStream = BuildMonitor.RequestCDN($"tpr/wow/data/{newRootHash.Substring(0, 2)}/{newRootHash.Substring(2, 2)}/{newRootHash}");
if (oldRootStream == null || newRootStream == null)
{
return(new List <RootEntry>());
}
var rootFromEntries = ParseRoot(oldRootStream).FileDataIds;
var rootToEntries = ParseRoot(newRootStream).FileDataIds;
var fromEntries = rootFromEntries.Keys.ToHashSet();
var toEntries = rootToEntries.Keys.ToHashSet();
var commonEntries = fromEntries.Intersect(toEntries);
var removedEntries = fromEntries.Except(commonEntries);
var addedEntries = toEntries.Except(commonEntries);