SerializationHeaderRecord.cs

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using System.Buffers.Binary;
using System.IO;
 
namespace System.Runtime.Serialization.Formatters.Binary;
 
internal sealed class SerializationHeaderRecord : IStreamable
{
    internal BinaryHeaderEnum _binaryHeaderEnum;
 
    internal int _topId;
 
    internal int _headerId;
 
    internal int _majorVersion;
 
    internal int _minorVersion;
 
    internal SerializationHeaderRecord()
    {
    }
 
    internal SerializationHeaderRecord(BinaryHeaderEnum binaryHeaderEnum, int topId, int headerId, int majorVersion, int minorVersion)
    {
        _binaryHeaderEnum = binaryHeaderEnum;
        _topId = topId;
        _headerId = headerId;
        _majorVersion = majorVersion;
        _minorVersion = minorVersion;
    }
 
    public void Write(BinaryFormatterWriter output)
    {
        _majorVersion = 1;
        _minorVersion = 0;
        output.WriteByte((byte)_binaryHeaderEnum);
        output.WriteInt32(_topId);
        output.WriteInt32(_headerId);
        output.WriteInt32(1);
        output.WriteInt32(0);
    }
 
    private static int GetInt32(byte[] buffer, int index)
    {
        return BinaryPrimitives.ReadInt32LittleEndian(buffer.AsSpan(index));
    }
 
    public void Read(BinaryParser input)
    {
        byte[] array = input.ReadBytes(17);
        if (array.Length < 17)
        {
            throw new EndOfStreamException(System.SR.IO_EOF_ReadBeyondEOF);
        }
        _majorVersion = GetInt32(array, 9);
        if (_majorVersion > 1)
        {
            throw new SerializationException(System.SR.Format(System.SR.Serialization_InvalidFormat, BitConverter.ToString(array)));
        }
        _binaryHeaderEnum = (BinaryHeaderEnum)array[0];
        _topId = GetInt32(array, 1);
        _headerId = GetInt32(array, 5);
        _minorVersion = GetInt32(array, 13);
    }
}