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using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using ProtoBuf.Meta;
namespace ProtoBuf
{
internal static class ExtensibleUtil
{
internal static IEnumerable<TValue> GetExtendedValues<TValue>(IExtensible instance, int tag, DataFormat format, bool singleton, bool allowDefinedTag)
{
foreach (object obj in ExtensibleUtil.GetExtendedValues(RuntimeTypeModel.Default, typeof(TValue), instance, tag, format, singleton, allowDefinedTag))
{
TValue value = (TValue)((object)obj);
yield return value;
value = default(TValue);
}
IEnumerator enumerator = null;
yield break;
yield break;
}
internal static IEnumerable GetExtendedValues(TypeModel model, Type type, IExtensible instance, int tag, DataFormat format, bool singleton, bool allowDefinedTag)
{
bool flag = instance == null;
if (flag)
{
throw new ArgumentNullException("instance");
}
bool flag2 = tag <= 0;
if (flag2)
{
throw new ArgumentOutOfRangeException("tag");
}
IExtension extn = instance.GetExtensionObject(false);
bool flag3 = extn == null;
if (flag3)
{
yield break;
}
Stream stream = extn.BeginQuery();
object value = null;
ProtoReader reader = null;
try
{
SerializationContext ctx = new SerializationContext();
reader = ProtoReader.Create(stream, model, ctx, -1);
while (model.TryDeserializeAuxiliaryType(reader, format, tag, type, ref value, true, false, false, false) && value != null)
{
bool flag4 = !singleton;
if (flag4)
{
yield return value;
value = null;
}
}
bool flag5 = singleton && value != null;
if (flag5)
{
yield return value;
}
ctx = null;
}
finally
{
ProtoReader.Recycle(reader);
extn.EndQuery(stream);
}
yield break;
yield break;
}
internal static void AppendExtendValue(TypeModel model, IExtensible instance, int tag, DataFormat format, object value)
{
bool flag = instance == null;
if (flag)
{
throw new ArgumentNullException("instance");
}
bool flag2 = value == null;
if (flag2)
{
throw new ArgumentNullException("value");
}
IExtension extensionObject = instance.GetExtensionObject(true);
bool flag3 = extensionObject == null;
if (flag3)
{
throw new InvalidOperationException("No extension object available; appended data would be lost.");
}
bool commit = false;
Stream stream = extensionObject.BeginAppend();
try
{
using (ProtoWriter protoWriter = new ProtoWriter(stream, model, null))
{
model.TrySerializeAuxiliaryType(protoWriter, null, format, tag, value, false);
protoWriter.Close();
}
commit = true;
}
finally
{
extensionObject.EndAppend(stream, commit);
}
}
}
}
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