frostfs-sdk-csharp/src/FrostFS.SDK.ModelsV2/Object/Object.cs

using System.Security.Cryptography;
using FrostFS.SDK.ModelsV2.Enums;

namespace FrostFS.SDK.ModelsV2;

public class Object
{
    public Object()
    {
    }

    public Object(ContainerId container, byte[] payload, ObjectType objectType = ObjectType.Regular)
    {
        Payload = payload;
        Header = new ObjectHeader(containerId: container, type: objectType, attributes: []);        
    }

    public ObjectHeader Header { get; set; }
    public ObjectId ObjectId { get; set; }
    public byte[] Payload { get; set; }
    public Signature Signature { get; set; }   

    public void SetParent(LargeObject largeObject)
    {
        Header.Split.ParentHeader = largeObject.Header;
    }

    public ObjectId? GetParentId()
    {
        return Header.Split?.Parent;
    }
}

public class LargeObject(ContainerId container) : Object(container, [])
{
    private SHA256 payloadHash = SHA256.Create();

    public void AppendBlock(byte[] bytes, int count)
    {
        Header.PayloadLength += (ulong)count;
        this.payloadHash.TransformBlock(bytes, 0, count, bytes, 0);
    }

    public LargeObject CalculateHash()
    {
        this.payloadHash.TransformFinalBlock([], 0, 0);
        Header.PayloadCheckSum = this.payloadHash.Hash;
        return this;
    }

    public ulong PayloadLength
    {
        get { return Header.PayloadLength; }
    }
}

public class LinkObject : Object
{
    public LinkObject(ContainerId containerId, SplitId splitId, LargeObject largeObject) : base (containerId, [])
    {
        Header.Split = new Split(splitId)
        {
            ParentHeader = largeObject.Header
        };
    }
}