/// <summary>
/// Deserializes the meta-data.
/// </summary>
/// <param name="stream"></param>
/// <param name="tagsCollectionIndex"></param>
/// <param name="size"></param>
protected virtual void DeserializeTags(LimitedStream stream, long size, ITagsCollectionIndex tagsCollectionIndex)
{
RuntimeTypeModel typeModel = RuntimeTypeModel.Create();
typeModel.Add(typeof(SerializableTag), true);
// read tags collection-count.
var countBytes = new byte[4];
stream.Read(countBytes, 0, 4);
int max = BitConverter.ToInt32(countBytes, 0);
// serialize tags collections one-by-one.
var currentTags = new List <SerializableTag>();
if (max > 0)
{ // keep reading until max.
currentTags.AddRange(typeModel.DeserializeWithSize(stream, null, typeof(SerializableTag[])) as SerializableTag[]);
// detect an empty collection at zero.
if (currentTags[0].CollectionId == 1)
{ // no zero, there is an empty collection.
tagsCollectionIndex.Add(new TagsCollection());
}
while (tagsCollectionIndex.Max < max)
{
// try and detect an id change.
bool idChanged = true;
while (currentTags.Count > 0 &&
idChanged)
{ // there are tags.
idChanged = false;
var tagsCollection = new TagsCollection();
int index = 0;
uint currentId = currentTags[index].CollectionId;
// detect an empty collection in between.
if (currentId > tagsCollectionIndex.Max + 1)
{ // it's possible there was an empty tag collection in there somewhere.
tagsCollectionIndex.Add(new TagsCollection());
}
tagsCollection.Add(new Tag(currentTags[index].Key, currentTags[index].Value));
index++;
while (currentTags.Count > index)
{ // test for a different id.
if (currentTags[index].CollectionId != currentId ||
currentTags[index].CollectionId == uint.MaxValue)
{ // yes! an id change was detected.
idChanged = true;
currentTags.RemoveRange(0, index);
if (tagsCollection.Count > 0)
{ // there are tags.
tagsCollectionIndex.AddObject(tagsCollection);
}
break;
}
tagsCollection.Add(new Tag(currentTags[index].Key, currentTags[index].Value));
index++;
}
}
// read next block.
currentTags.AddRange(typeModel.DeserializeWithSize(stream, null, typeof(SerializableTag[])) as SerializableTag[]);
}
}
}
