public void Update()
{
if (isDone)
{
return;
}
switch (state)
{
case State.HeadRequest:
if (request.error != null)
{
error = request.error;
}
if (request.isDone)
{
maxlen = long.Parse(request.GetResponseHeader("Content-Length"));
request.Dispose();
request = null;
var dir = Path.GetDirectoryName(savePath);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
fs = new FileStream(savePath, FileMode.OpenOrCreate, FileAccess.Write);
len = fs.Length;
var emptyVersion = string.IsNullOrEmpty(version);
var oldVersion = Versions.Get(savePath);
var emptyOldVersion = string.IsNullOrEmpty(oldVersion);
if (emptyVersion || emptyOldVersion || !oldVersion.Equals(version))
{
Versions.Set(savePath, version);
len = 0;
}
if (len < maxlen)
{
fs.Seek(len, SeekOrigin.Begin);
request = UnityWebRequest.Get(url);
request.SetRequestHeader("Range", "bytes=" + len + "-");
request.SendWebRequest();
state = State.ContentRequest;
index = 0;
}
else
{
state = State.FinishRequest;
}
}
break;
case State.ContentRequest:
if (request.error != null)
{
error = request.error;
}
if (!request.isDone)
{
WriteBuffer();
}
else
{
WriteBuffer();
if (fs != null)
{
fs.Close();
fs.Dispose();
}
request.Dispose();
state = State.FinishRequest;
}
break;
case State.FinishRequest:
if (completed != null)
{
completed.Invoke();
}
isDone = true;
state = State.Completed;
break;
}
}