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https://github.com/FabInfra/capnproto-dotnetcore_Runtime.git
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104 lines
4.1 KiB
C#
104 lines
4.1 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Capnp
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{
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/// <summary>
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/// Provides deep-copy functionality to re-serialize an existing deserializer state into another serializer state.
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/// </summary>
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public static class Reserializing
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{
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/// <summary>
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/// Performs a deep copy of an existing deserializer state into another serializer state.
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/// This implementation does not analyze the source object graph and therefore cannot detect multiple references to the same object.
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/// Such cases will result in object duplication.
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/// </summary>
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/// <param name="from">source state</param>
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/// <param name="to">target state</param>
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/// <exception cref="ArgumentNullException"><paramref name="to"/> is null.</exception>
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/// <exception cref="InvalidOperationException">Target state was already set to a different object type than the source state.</exception>
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/// <exception cref="DeserializationException">Security violation due to amplification attack or stack overflow DoS attack,
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/// or illegal pointer detected during deserialization.</exception>
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public static void DeepCopy(DeserializerState from, SerializerState to)
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{
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if (to == null)
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throw new ArgumentNullException(nameof(to));
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if (from.Caps != null && to.Caps != null)
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{
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to.Caps.Clear();
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to.Caps.AddRange(from.Caps);
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}
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var ds = to.Rewrap<DynamicSerializerState>();
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IReadOnlyList<DeserializerState> items;
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switch (from.Kind)
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{
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case ObjectKind.Struct:
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ds.SetStruct(from.StructDataCount, from.StructPtrCount);
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ds.Allocate();
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from.StructDataSection.CopyTo(ds.StructDataSection);
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for (int i = 0; i < from.StructPtrCount; i++)
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{
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DeepCopy(from.StructReadPointer(i), ds.BuildPointer(i));
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}
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break;
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case ObjectKind.ListOfBits:
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ds.SetListOfValues(1, from.ListElementCount);
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from.RawData.CopyTo(ds.RawData);
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break;
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case ObjectKind.ListOfBytes:
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ds.SetListOfValues(8, from.ListElementCount);
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from.RawData.CopyTo(ds.RawData);
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break;
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case ObjectKind.ListOfEmpty:
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ds.SetListOfValues(0, from.ListElementCount);
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break;
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case ObjectKind.ListOfInts:
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ds.SetListOfValues(32, from.ListElementCount);
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from.RawData.CopyTo(ds.RawData);
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break;
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case ObjectKind.ListOfLongs:
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ds.SetListOfValues(64, from.ListElementCount);
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from.RawData.CopyTo(ds.RawData);
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break;
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case ObjectKind.ListOfShorts:
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ds.SetListOfValues(16, from.ListElementCount);
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from.RawData.CopyTo(ds.RawData);
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break;
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case ObjectKind.ListOfPointers:
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ds.SetListOfPointers(from.ListElementCount);
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items = (IReadOnlyList<DeserializerState>)from.RequireList();
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for (int i = 0; i < from.ListElementCount; i++)
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{
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DeepCopy(items[i], ds.BuildPointer(i));
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}
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break;
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case ObjectKind.ListOfStructs:
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ds.SetListOfStructs(from.ListElementCount, from.StructDataCount, from.StructPtrCount);
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items = (IReadOnlyList<DeserializerState>)from.RequireList();
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for (int i = 0; i < from.ListElementCount; i++)
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{
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DeepCopy(items[i], ds.ListBuildStruct(i));
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}
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break;
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case ObjectKind.Capability:
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ds.SetCapability(from.CapabilityIndex);
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break;
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}
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to.InheritFrom(ds);
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}
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}
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} |