public static bool TryParseInfo(BEnc enc, out TorrentFile?file)
{
file = default;
if (!(enc is BDict d))
{
return(false);
}
var len = d["length"];
if (len == null)
{
return(false);
}
if (!(len is BInt lenI))
{
return(false);
}
var pth = d["path"];
if (pth == null)
{
return(false);
}
if (!(pth is BLst pl) || pl.Value.Any(x => !(x is BStr)))
{
return(false);
}
var elems = pl.Value.OfType <BStr>().ToArray();
file = new TorrentFile(lenI, elems);
return(true);
}
public static T Deserialize <T>(BEnc encoded) => (T)Deserialize(encoded, typeof(T));
public static object Deserialize(BEnc encoded, Type type)
{
if (type.IsInstanceOfType(encoded))
{
return(encoded);
}
switch (encoded)
{
case BStr str: {
if (type == typeof(string))
{
return(str.Utf8String);
}
if (type == typeof(byte[]))
{
return(str.Value.ToArray());
}
if (type == typeof(ReadOnlyMemory <byte>))
{
return(str.Value);
}
throw new InvalidOperationException($"Can't deserialize a {encoded.Type} to {type}");
}
case BInt bint:
if (type == typeof(int))
{
return(bint.IntValue);
}
if (type == typeof(int?))
{
return(bint.IntValue);
}
if (type == typeof(uint))
{
return((uint)bint.Value);
}
if (type == typeof(uint?))
{
return((uint?)bint.Value);
}
if (type == typeof(long))
{
return(bint.Value);
}
if (type == typeof(long?))
{
return(bint.Value);
}
if (type == typeof(ulong))
{
return((ulong)bint.Value);
}
if (type == typeof(ulong?))
{
return((ulong?)bint.Value);
}
throw new InvalidOperationException($"Can't deserialize a {encoded.Type} to {type}");
case BLst lst:
if (type.IsArray)
{
var elementType = type.GetElementType()
?? throw new InvalidOperationException($"");
var items = lst.Value.Select(v => Deserialize(v, elementType)).ToArray();
var arr = Array.CreateInstance(elementType, items.Length);
for (var i = 0; i < items.Length; i++)
{
arr.SetValue(items[i], i);
}
return(arr);
}
if (type.IsConstructedGenericType && type.GetGenericTypeDefinition() == typeof(List <>))
{
var inst = Activator.CreateInstance(type) as IList;
if (inst == null)
{
throw new InvalidOperationException($"Failed to create type {type}");
}
foreach (var v in lst.Value.Select(v => Deserialize(v, type.GenericTypeArguments[0])))
{
inst.Add(v);
}
return(inst);
}
throw new InvalidOperationException($"Can't deserialize a {encoded.Type} to {type}");
case BDict dict: {
var dictType = type.GetInterfaces().FirstOrDefault(iface =>
iface.IsConstructedGenericType && iface.GetGenericTypeDefinition() == typeof(IDictionary <,>));
if (dictType != null)
{
var tk = dictType.GenericTypeArguments[0];
var tv = dictType.GenericTypeArguments[0];
var inst = Activator.CreateInstance(type) as IDictionary;
if (inst == null)
{
throw new InvalidOperationException($"Failed to create type {type}");
}
foreach (var kv in dict.Value)
{
inst.Add(Deserialize(kv.Key, tk), Deserialize(kv.Value, tv));
}
return(inst);
}
else
{
var inst = Activator.CreateInstance(type);
if (inst == null)
{
throw new InvalidOperationException($"Failed to create type {type}");
}
var props = type.GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(p => p.CanWrite)
.ToArray();
foreach (var p in props)
{
var attr =
p.GetCustomAttribute(typeof(MetaInfoPropertyAttribute)) as MetaInfoPropertyAttribute;
if (attr == null)
{
continue;
}
var name = attr.Name ?? p.Name;
var val = dict[name];
if (val != null)
{
p.SetValue(inst, Deserialize(val, p.PropertyType));
}
}
return(inst);
}
throw new InvalidOperationException($"Can't deserialize a {encoded.Type} to {type}");
}
default:
throw new InvalidOperationException($"Can't deserialize a {encoded.Type} to {type}");
}
}
