Unity杂文——循环的字节序列Stream

  1. 简介
  2. 代码如下

原文地址

简介

这篇博客主要介绍了一个字节序列类CircularBuffer,它是用于频繁创建Stream数据的循环利用。CircularBuffer类继承自Stream类,并实现了其各种方法,包括读写、查找、设置长度等。

在CircularBuffer类中,主要定义了一些关键的属性,如字节数组、偏移值、开始坐标、结束坐标、长度、当前位置、容量、限制读取长度和标记等。其中,字节数组用于存储数据,偏移值用于定位数据,开始坐标和结束坐标用于定义数据的起始和结束位置,长度表示数据的长度,当前位置表示当前读写的位置,容量表示最大可以存储的数据量,限制读取长度用于限制读取的数据长度,标记用于标记当前对象。

在CircularBuffer类中,还定义了一些方法,如初始化、设置限制读取长度、读取字节、查找字节、设置长度、写入字节、收缩、扩展、开始接收、结束接收、开始发送、结束发送、重置等。这些方法主要用于操作和管理数据。

CircularBuffer类的主要优点是可以有效地管理和操作数据,特别是在需要频繁创建Stream数据的情况下,可以有效地提高性能和效率。同时,CircularBuffer类的设计也非常灵活和通用,可以适应各种不同的应用场景。

总的来说,CircularBuffer类是一个非常实用和高效的字节序列类,值得大家在实际的开发中使用和学习。

代码如下

public class CircularBuffer : Stream
{
    /// <summary>
    /// 字节数组
    /// </summary>
    private byte[] m_Buffer;
    /// <summary>
    /// 偏移值
    /// </summary>
    private int m_Offset; // []

    /// <summary>
    /// 开始坐标
    /// </summary>
    private int m_Begin;  // [0, m_Capacity)
    /// <summary>
    /// 结束坐标
    /// </summary>
    private int m_End;    // [0, m_Capacity)
    /// <summary>
    /// 长度
    /// </summary>
    private int m_Length;
    /// <summary>
    /// 当前位置
    /// </summary>
    private int m_Position;

    /// <summary>
    /// 容量
    /// </summary>
    private int m_Capacity;
    /// <summary>
    /// 限制读取长度
    /// </summary>
    private int m_LimitReadLength;
    /// <summary>
    /// 标记
    /// </summary>
    private string m_Tag;

    /// <summary>
    /// 缓存
    /// </summary>
    private byte[] m_Cached = new byte[4];

    /// <summary>
    /// 是否刻度
    /// </summary>
    public override bool CanRead => true;

    /// <summary>
    /// 是否可定位
    /// </summary>
    public override bool CanSeek => true;

    /// <summary>
    /// 是否可写入
    /// </summary>
    public override bool CanWrite => true;

    /// <summary>
    /// 长度
    /// </summary>
    public override long Length => m_Length;

    /// <summary>
    /// 当前位置坐标
    /// </summary>
    public override long Position
    {
        get => m_Position;

        set
        {
            if (m_Position == value) return;
            Seek(value, SeekOrigin.Begin);
        }
    }

    /// <summary>
    /// 容器长度
    /// </summary>
    public int Capacity => m_Capacity;

    /// <summary>
    /// 标记
    /// </summary>
    public string Tag => m_Tag;
    
    /// <summary>
    /// 索引读取
    /// </summary>
    /// <param name="index"></param>
    /// <exception cref="ArgumentOutOfRangeException"></exception>
    public byte this[int index]
    {
        get
        {
            if (index < 0 || index >= m_Length)
            {
                throw new ArgumentOutOfRangeException($"index {index} length {m_Length}");
            }
            var begin = m_Begin;
            var end = m_End;

            if (end > begin)
            {
                //    0    m_Begin  m_End   m_Capacity
                //    |_______|_______|_______|
                //                |
                //            m_Position
                return m_Buffer[m_Offset + begin + index];
            }
            else
            {
                //    0     m_End  m_Begin   m_Capacity
                //    |_______|_______|_______|
                //        |               |
                //       (1)  m_Position (2)
                var blockLen = m_Capacity - begin;
                return blockLen > index ?
                    //(2)
                    m_Buffer[m_Offset + begin + index] :
                    //(1)
                    m_Buffer[m_Offset + index - blockLen];
            }
        }
        set
        {
            if (index < 0 || index >= m_Length)
            {
                throw new ArgumentOutOfRangeException($"index {index} length {m_Length}");
            }
            var begin = m_Begin;
            var end = m_End;

            if (end > begin)
            {
                //    0    m_Begin  m_End   m_Capacity
                //    |_______|_______|_______|
                //                |
                //            m_Position
                m_Buffer[m_Offset + begin + index] = value;
            }
            else
            {
                //    0     m_End  m_Begin   m_Capacity
                //    |_______|_______|_______|
                //        |               |
                //       (1)  m_Position (2)
                var blockLen = m_Capacity - begin;

                if (blockLen > index)
                {
                    //(2)
                    m_Buffer[m_Offset + begin + index] = value;
                }
                else
                {
                    //(1)
                    m_Buffer[m_Offset + index - blockLen] = value;
                }
            }
        }
    }

    /// <summary>
    /// 初始化
    /// </summary>
    /// <param name="tag"></param>
    /// <param name="capcity"></param>
    public CircularBuffer(string tag, int capcity)
    {
        m_Capacity = capcity;
        m_Buffer = new byte[m_Capacity];
        m_Offset = 0;
        m_Begin = 0;
        m_End = 0;
        m_Length = 0;
        m_Position = 0;
        m_Tag = tag;
    }

    /// <summary>
    /// 设置限制读取长度
    /// </summary>
    /// <param name="length"></param>
    public void SetLimitReadLength(int length)
    {
        Trace($"{length}");

        m_LimitReadLength = length;
    }

    #region Override

    /// <summary>
    /// 继承的类必须实现此方法,以便在流中写入字节。
    /// </summary>
    /// <exception cref="NotImplementedException"></exception>
    public override void Flush()
    {
        throw new NotImplementedException();
    }

    /// <summary>
    /// 打印日志
    /// </summary>
    /// <param name="msg"></param>
    /// <param name="memberName"></param>
    /// <param name="lineNum"></param>
    [Conditional("DEBUG_STREAM_TRACE")]
    private static void Trace(string msg, [CallerMemberName] string memberName = "", [CallerLineNumber] int lineNum = 0)
    {
        //Logging.Log($"{m_Tag} {memberName}:{lineNum}:{Thread.CurrentThread.ManagedThreadId} {m_Begin} {m_End} {m_Position} {m_LimitReadLength} {m_Length}/{m_Capacity} {msg}");
    }

    /// <summary>
    /// 读取字节未见
    /// </summary>
    /// <param name="buffer"></param>
    /// <param name="offset"></param>
    /// <param name="count"></param>
    /// <returns></returns>
    /// <exception cref="Exception"></exception>
    public override int Read(byte[] buffer, int offset, int count)
    {
        Trace($"{offset} {count}");

        var position = m_Position;
        var dataLen = (int)Math.Min(count, (0 == m_LimitReadLength ? m_Length : m_LimitReadLength) - position);

        if (0 == dataLen) return 0;

        try
        {

            var begin = m_Begin;
            var end = m_End;

            if (end > begin)
            {
                //    0    m_Begin  m_End   m_Capacity
                //    |_______|_______|_______|
                //                |
                //            m_Position
                Buffer.BlockCopy(m_Buffer, m_Offset + begin + position, buffer, offset, dataLen);
            }
            else
            {
                //    0     m_End  m_Begin   m_Capacity
                //    |_______|_______|_______|
                //        |               |
                //       (1)  m_Position (2)
                var blockLen = m_Capacity - begin;

                if (blockLen > position)
                {
                    //(2)
                    var copyLen = blockLen - position;
                    var remain = dataLen - copyLen;
                    if (remain > 0)
                    {
                        Buffer.BlockCopy(m_Buffer, m_Offset + begin + position, buffer, offset, copyLen);
                        Buffer.BlockCopy(m_Buffer, m_Offset, buffer, offset + copyLen, remain);
                    }
                    else
                    {
                        Buffer.BlockCopy(m_Buffer, m_Offset + begin + position, buffer, offset, dataLen);
                    }
                }
                else
                {
                    //(1)
                    Buffer.BlockCopy(m_Buffer, m_Offset + position - blockLen, buffer, offset, dataLen);
                }
            }
        }
        catch (Exception e)
        {
            UnityEngine.Debug.LogError($"read {m_Position} {m_LimitReadLength} {m_Length} {m_Begin} {m_End} {m_Offset} {m_Capacity}");
            throw e;
        }

        m_Position += dataLen;
        return dataLen;
    }

    /// <summary>
    /// 查找字节
    /// </summary>
    /// <param name="offset"></param>
    /// <param name="origin"></param>
    /// <returns></returns>
    /// <exception cref="ArgumentOutOfRangeException"></exception>
    public override long Seek(long offset, SeekOrigin origin)
    {
        Trace($"{offset} {origin}");

        var length = m_Length;
        long position = m_Position;
        switch (origin)
        {
            case SeekOrigin.Begin:
                position = offset;
                break;
            case SeekOrigin.End:
                position = offset + length;
                break;
            case SeekOrigin.Current:
                position += offset;
                break;
            default:
                throw new ArgumentOutOfRangeException(nameof(origin), origin, null);
        }
        m_Position = (int)Math.Max(0, Math.Min(position, length));
        return m_Position;
    }

    /// <summary>
    /// 设置长度
    /// </summary>
    /// <param name="value"></param>
    /// <exception cref="NotImplementedException"></exception>
    public override void SetLength(long value)
    {
        throw new NotImplementedException();
    }
    
    /// <summary>
    /// 写入字节
    /// </summary>
    /// <param name="length"></param>
    /// <returns></returns>
    public StringBuilder GetHexData(int length = -1)
    {
        var sb = new StringBuilder();
        var begin = m_Begin;
        var end = m_End;
        var count = 0;
        var maxCount = -1 == length ? m_Length : length;
        if (end > begin || 0 == m_Length)
        {
            for (var i = begin; i < end && count < maxCount; i++, count++)
            {
                sb.Append($"{m_Buffer[m_Offset + i]:x2} ");
            }
        }
        else
        {
            for (var i = begin; i < m_Capacity && count < maxCount; i++, count++)
            {
                sb.Append($"{m_Buffer[m_Offset + i]:x2} ");
            }

            for (var i = 0; i < m_End && count < maxCount; i++, count++)
            {
                sb.Append($"{m_Buffer[m_Offset + i]:x2} ");
            }
        }

        return sb;
    }

    /// <summary>
    /// 获取字节
    /// </summary>
    /// <param name="buffer"></param>
    /// <param name="offset"></param>
    /// <param name="count"></param>
    /// <returns></returns>
    private StringBuilder GetHexData(byte[] buffer, int offset, int count)
    {
        var sb = new StringBuilder();
        for (var i = 0; i < count; i++)
        {
            sb.Append($"{buffer[offset + i]:x2} ");
        }
        return sb;
    }

    /// <summary>
    /// 写入字节
    /// </summary>
    /// <param name="buffer"></param>
    /// <param name="offset"></param>
    /// <param name="count"></param>
    /// <exception cref="OutOfMemoryException"></exception>
    /// <exception cref="Exception"></exception>
    public override void Write(byte[] buffer, int offset, int count)
    {
        if (0 == count) return;

        Trace($"{GetHexData(buffer, offset, count)}");

        var position = m_Position;
        var length = m_Length;
        if (m_Capacity - position < count)
        {
            throw new OutOfMemoryException();
        }

        try
        {
            var begin = m_Begin;
            var end = m_End;
            var replaceLen = length - position;
            if (end > begin || 0 == m_Length)
            {
                //    0    m_Begin  m_End   m_Capacity
                //    |_______|_______|_______|
                //                |
                //            m_Position
                var copyLen = m_Capacity - (begin + position);
                var remain = count - copyLen;
                if (remain > 0)
                {
                    Buffer.BlockCopy(buffer, offset, m_Buffer, m_Offset + begin + position, copyLen);
                    Buffer.BlockCopy(buffer, offset + copyLen, m_Buffer, m_Offset, remain);
                }
                else
                {
                    Buffer.BlockCopy(buffer, offset, m_Buffer, m_Offset + begin + position, count);
                }
            }
            else
            {
                //    0     m_End  m_Begin   m_Capacity
                //    |_______|_______|_______|
                //        |               |
                //       (1)  m_Position (2)

                var blockLen = m_Capacity - begin;
                if (blockLen > position)
                {
                    //(2)
                    var copyLen = blockLen - position;
                    var remain = count - copyLen;
                    if (remain > 0)
                    {
                        Buffer.BlockCopy(buffer, offset, m_Buffer, m_Offset + begin + position, copyLen);
                        Buffer.BlockCopy(buffer, offset + copyLen, m_Buffer, m_Offset, remain);
                    }
                    else
                    {
                        Buffer.BlockCopy(buffer, offset, m_Buffer, m_Offset + begin + position, count);
                    }
                }
                else
                {
                    //(1)
                    Buffer.BlockCopy(buffer, offset, m_Buffer, m_Offset + position - blockLen, count);
                }
            }
            if (count > replaceLen)
            {
                Expand(count - replaceLen);
            }
            else
            {
                m_Position += count;
            }
        }
        catch (Exception e)
        {
            UnityEngine.Debug.LogError($"write {m_Position} {m_LimitReadLength} {m_Length} {m_Begin} {m_End} {m_Offset} {m_Capacity} {count}");
            throw e;
        }


        Trace($"{GetHexData()}");
    }

    /// <summary>
    /// 释放
    /// </summary>
    /// <param name="disposing"></param>
    protected override void Dispose(bool disposing)
    {
        base.Dispose(disposing);
        if (m_Capacity > 0)
        {
            m_Buffer = null;
            m_Capacity = 0;
        }
    }
    #endregion

    /// <summary>
    /// 收缩
    /// </summary>
    /// <param name="length"></param>
    public void Shrink(int length)
    {
        Trace($"start {length}");

        m_Begin += length;
        if (m_Begin >= m_Capacity)
        {
            m_Begin -= m_Capacity;
        }
        if (m_Position <= length)
        {
            m_Position = 0;
        }
        else
        {
            m_Position -= length;
        }
        m_Length -= length;

        Trace($"end {length}");
    }

    /// <summary>
    /// 扩展
    /// </summary>
    /// <param name="length"></param>
    public void Expand(int length)
    {
        Trace($"start {length}");

        m_End += length;
        if (m_End >= m_Capacity)
        {
            m_End -= m_Capacity;
        }
        m_Length += length;
        m_Position = m_Length;

        Trace($"end {length}");
    }

    /// <summary>
    /// 开始接收
    /// </summary>
    /// <returns></returns>
    /// <exception cref="Exception"></exception>
    public ArraySegment<byte>[] BeginRcv()
    {
        Trace("");

        try
        {
            var length = m_Length;
            if (m_Capacity == length)
            {
                return Array.Empty<ArraySegment<byte>>();
            }

            var begin = m_Begin;
            var end = m_End;
            if (end > begin || 0 == m_Length)
            {

                //    0    m_Begin  m_End   m_Capacity
                //    |_______|_______|_______|
                if (0 == begin)
                {
                    return new ArraySegment<byte>[]
                    {
                        new ArraySegment<byte>(m_Buffer, m_Offset + end, m_Capacity - end)
                    };
                }

                return new ArraySegment<byte>[]
                {
                    new ArraySegment<byte>(m_Buffer, m_Offset + end, m_Capacity - end),
                    new ArraySegment<byte>(m_Buffer, m_Offset, begin)
                };
            }
            else
            {
                //    0     m_End  m_Begin   m_Capacity
                //    |_______|_______|_______|
                return new ArraySegment<byte>[]
                {
                    new ArraySegment<byte>(m_Buffer, m_Offset + end, begin - end)
                };
            }
        }
        catch (Exception ex)
        {
            UnityEngine.Debug.LogError($"{m_Length} {m_Capacity} {m_Begin} {m_End} {m_Offset}");
            throw ex;
        }

    }

    /// <summary>
    /// 结束接收
    /// </summary>
    /// <param name="length"></param>
    /// <exception cref="OutOfMemoryException"></exception>
    public void EndRcv(int length)
    {
        Trace($"{length}");

        if (m_Capacity >= m_Length + length)
        {
            Expand(length);
        }
        else
        {
            throw new OutOfMemoryException();
        }
    }

    /// <summary>
    /// 开始发送
    /// </summary>
    /// <returns></returns>
    public ArraySegment<byte>[] BeginSend()
    {
        if (0 == m_Length) return Array.Empty<ArraySegment<byte>>();

        var begin = m_Begin;
        var end = m_End;
        if (end > begin)
        {
            Trace($"offset {m_Offset + begin} len {end - begin}");

            //    0    m_Begin  m_End   m_Capacity
            //    |_______|_______|_______|
            return new ArraySegment<byte>[]
            {
                new ArraySegment<byte>(m_Buffer, m_Offset + begin, end - begin)
            };
        }
        else
        {
            Trace($"offset {m_Offset + begin} len {m_Capacity - begin} offset {m_Offset} len {end}");

            //    0     m_End  m_Begin   m_Capacity
            //    |_______|_______|_______|
            return new ArraySegment<byte>[]
            {
                new ArraySegment<byte>(m_Buffer, m_Offset + begin, m_Capacity - begin),
                new ArraySegment<byte>(m_Buffer, m_Offset, end)
            };
        }
    }

    /// <summary>
    /// 结束发送
    /// </summary>
    /// <param name="length"></param>
    /// <exception cref="IndexOutOfRangeException"></exception>
    public void EndSend(int length)
    {
        Trace($"{GetHexData(length)}");

        if (m_Length >= length)
        {
            Shrink(length);
        }
        else
        {
            throw new IndexOutOfRangeException();
        }
    }

    /// <summary>
    /// 重置
    /// </summary>
    public void Reset()
    {
        Trace("");

        m_Length = 0;
        m_Begin = 0;
        m_End = 0;
        m_Position = 0;
    }

    /// <summary>
    /// 写入
    /// </summary>
    /// <param name="v"></param>
    public void Write(int v)
    {

        m_Cached[0] = (byte)(v >> 0);
        m_Cached[1] = (byte)(v >> 8);
        m_Cached[2] = (byte)(v >> 16);
        m_Cached[3] = (byte)(v >> 24);

        Write(m_Cached, 0, 4);
    }

    /// <summary>
    /// 读取
    /// </summary>
    /// <returns></returns>
    public int ReadInt32()
    {
        Read(m_Cached, 0, 4);

        var result = 0;
        result |= (int)m_Cached[0];
        result |= (int)(m_Cached[1] << 8);
        result |= (int)(m_Cached[2] << 16);
        result |= (int)(m_Cached[3] << 24);

        return result;
    }

    /// <summary>
    /// 写入
    /// </summary>
    /// <param name="v"></param>
    public void Write(uint v)
    {
        m_Cached[0] = (byte)(v >> 0);
        m_Cached[1] = (byte)(v >> 8);
        m_Cached[2] = (byte)(v >> 16);
        m_Cached[3] = (byte)(v >> 24);

        Write(m_Cached, 0, 4);
    }

    /// <summary>
    /// 读取
    /// </summary>
    /// <returns></returns>
    public uint ReadUInt32()
    {
        Read(m_Cached, 0, 4);

        uint result = 0;
        result |= (uint)m_Cached[0];
        result |= (uint)(m_Cached[1] << 8);
        result |= (uint)(m_Cached[2] << 16);
        result |= (uint)(m_Cached[3] << 24);

        return result;
    }

    /// <summary>
    /// 写入
    /// </summary>
    /// <param name="v"></param>
    public void Write(ushort v)
    {
        m_Cached[0] = (byte)(v >> 0);
        m_Cached[1] = (byte)(v >> 8);

        Write(m_Cached, 0, 2);
    }

    /// <summary>
    /// 读取
    /// </summary>
    /// <returns></returns>
    public uint ReadUInt16()
    {
        Read(m_Cached, 0, 2);

        ushort result = 0;
        result |= (ushort)m_Cached[0];
        result |= (ushort)(m_Cached[1] << 8);

        return result;
    }

    /// <summary>
    /// 写入
    /// </summary>
    /// <param name="v"></param>
    public void Write(short v)
    {
        m_Cached[0] = (byte)(v >> 0);
        m_Cached[1] = (byte)(v >> 8);

        Write(m_Cached, 0, 2);
    }

    /// <summary>
    /// 读取
    /// </summary>
    /// <returns></returns>
    public int ReadInt16()
    {
        Read(m_Cached, 0, 2);

        short result = 0;
        result |= (short)m_Cached[0];
        result |= (short)(m_Cached[1] << 8);

        return result;
    }

    /// <summary>
    /// 写入
    /// </summary>
    /// <param name="v"></param>
    public void Write(byte v)
    {
        m_Cached[0] = v;

        Write(m_Cached, 0, 1);
    }

    /// <summary>
    /// 读取
    /// </summary>
    /// <returns></returns>
    public byte ReadUInt8()
    {
        Read(m_Cached, 0, 1);
        return m_Cached[0];
    }
}
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