字节操作

转载 于 2012-06-30 15:22:10 发布 · 1.4k 阅读 · 0
文章标签：

#byte #buffer #null #methods #struct #output

这是一个用于字节操作的类，提供了一系列方法进行字节的读写和转换。

/// <summary>
    /// 字节操作类
    /// </summary>
    public struct BytesIO
    {
        #region Field

        private byte[] _Raw;

        private int _Position;
        /// <summary>
        /// 获取当前位置
        /// </summary>
        public int Position
        {
            get { return _Position; }
        }

        public BytesIO(byte[] raw)
        {
            _Raw = raw;
            _Position = 0;
        }

        #endregion

        #region Input
        /// <summary>
        /// 写入布尔值,并移动指针
        /// </summary>
        public void Put(bool value)
        {
            _Raw[_Position++] = value ? (byte)1 : (byte)0;
        }
        /// <summary>
        /// 写入布尔值到指定位置
        /// </summary>
        public void Put(int index,bool value)
        {
            _Raw[index] = value ? (byte)1 : (byte)0;
        }
        /// <summary>
        /// 写入字节值,并移动指针
        /// </summary>
        public void Put(byte value)
        {
            _Raw[_Position++] = value;
        }
        /// <summary>
        /// 写入字节值到指定位置,并移动指针
        /// </summary>
        public void Put(int index, byte value)
        {
            _Raw[index] = value;
        }
        /// <summary>
        /// 写入字节数组,并移动指针
        /// </summary>
        public void Put(byte[] value)
        {
            if (value == null)   return;
            foreach (var item in value)
                _Raw[_Position++] = item;
        }
        /// <summary>
        /// 写入ASCII字符,并移动指针
        /// </summary>
        public void Put(char ch)
        {
            _Raw[_Position++] = Convert.ToByte(ch);
        }
        /// <summary>
        /// 写入ASCII字符到指定位置
        /// </summary>
        public void Put(int index, char ch)
        {
            _Raw[index] = Convert.ToByte(ch);
        }
        /// <summary>
        /// 写入ASCII字符串,并移动指针
        /// </summary>
        public void Put(char[] chars)
        {
            if (chars == null) return;
            foreach (var item in chars)
                _Raw[_Position++] = Convert.ToByte(item);
        }
        /// <summary>
        /// 从指定位置写入ASCII字符串
        /// </summary>
        public void Put(int index, char[] chars)
        {
            if (chars == null) return;
            foreach (var item in chars)
                _Raw[index++] = Convert.ToByte(item);
        }
        /// <summary>
        /// 写入16位有符号整数,并移动指针
        /// </summary>
        public void Put(short value)
        {
            _Raw[_Position++] = (byte)(value >> 8);
            _Raw[_Position++] = (byte)value;
        }
        /// <summary>
        /// 写入16位有符号整数到指定位置
        /// </summary>
        public void Put(int index, short value)
        {
            _Raw[index++] = (byte)(value >> 8);
            _Raw[index] = (byte)value;
        }
        /// <summary>
        /// 写入16位无符号整数,并移动指针
        /// </summary>
        public void Put(ushort value)
        {
            _Raw[_Position++] = (byte)(value >> 8);
            _Raw[_Position++] = (byte)value;
        }
        /// <summary>
        /// 写入16位无符号整数到指定位置
        /// </summary>
        public void Put(int index, ushort value)
        {
            _Raw[index++] = (byte)(value >> 8);
            _Raw[index] = (byte)value;
        }
        /// <summary>
        /// 写入32位有符号的整数,并移动指针
        /// </summary>
        public void Put(int value)
        {
            _Raw[_Position++] = (byte)(value >> 0x18);
            _Raw[_Position++] = (byte)(value >> 0x10);
            _Raw[_Position++] = (byte)(value >> 8);
            _Raw[_Position++] = (byte)(value);
        }
        /// <summary>
        /// 写入32位有符号的整数到指定位置
        /// </summary>
        public void Put(int index, int value)
        {
            _Raw[index++] = (byte)(value >> 0x18);
            _Raw[index++] = (byte)(value >> 0x10);
            _Raw[index++] = (byte)(value >> 8);
            _Raw[index] = (byte)(value);
        }
        /// <summary>
        /// 写入32位无符号的整数,并移动指针
        /// </summary>
        public void Put(uint value)
        {
            _Raw[_Position++] = (byte)(value >> 0x18);
            _Raw[_Position++] = (byte)(value >> 0x10);
            _Raw[_Position++] = (byte)(value >> 8);
            _Raw[_Position++] = (byte)(value);
        }
        /// <summary>
        /// 写入32位有符号的整数到指定位置
        /// </summary>
        public void Put(int index, uint value)
        {
            _Raw[index++] = (byte)(value >> 0x18);
            _Raw[index++] = (byte)(value >> 0x10);
            _Raw[index++] = (byte)(value >> 8);
            _Raw[index] = (byte)(value);
        }
        /// <summary>
        /// 写入64位有符号的整数，并移动指针
        /// </summary>
        public void Put(long value)
        {
            _Raw[_Position++] = (byte)(value >> 0x38);
            _Raw[_Position++] = (byte)(value >> 0x30);
            _Raw[_Position++] = (byte)(value >> 0x28);
            _Raw[_Position++] = (byte)(value >> 0x20);
            _Raw[_Position++] = (byte)(value >> 0x18);
            _Raw[_Position++] = (byte)(value >> 0x10);
            _Raw[_Position++] = (byte)(value >> 8);
            _Raw[_Position++] = (byte)value;
        }
        /// <summary>
        /// 写入64位有符号的整数到指定位置
        /// </summary>
        public void Put(int index, long value)
        {
            _Raw[index++] = (byte)(value >> 0x38);
            _Raw[index++] = (byte)(value >> 0x30);
            _Raw[index++] = (byte)(value >> 0x28);
            _Raw[index++] = (byte)(value >> 0x20);
            _Raw[index++] = (byte)(value >> 0x18);
            _Raw[index++] = (byte)(value >> 0x10);
            _Raw[index++] = (byte)(value >> 8);
            _Raw[index] = (byte)value;
        }
        /// <summary>
        /// 写入64位无符号的整数，并移动指针
        /// </summary>
        public void Put(ulong value)
        {
            _Raw[_Position++] = (byte)(value >> 0x38);
            _Raw[_Position++] = (byte)(value >> 0x30);
            _Raw[_Position++] = (byte)(value >> 0x28);
            _Raw[_Position++] = (byte)(value >> 0x20);
            _Raw[_Position++] = (byte)(value >> 0x18);
            _Raw[_Position++] = (byte)(value >> 0x10);
            _Raw[_Position++] = (byte)(value >> 8);
            _Raw[_Position++] = (byte)value;
        }
        /// <summary>
        /// 写入64位有符号的整数到指定位置
        /// </summary>
        public void Put(int index, ulong value)
        {
            _Raw[index++] = (byte)(value >> 0x38);
            _Raw[index++] = (byte)(value >> 0x30);
            _Raw[index++] = (byte)(value >> 0x28);
            _Raw[index++] = (byte)(value >> 0x20);
            _Raw[index++] = (byte)(value >> 0x18);
            _Raw[index++] = (byte)(value >> 0x10);
            _Raw[index++] = (byte)(value >> 8);
            _Raw[index ] = (byte)value;
        }
        /// <summary>
        /// 写入Guid值，并移动指针
        /// </summary>
        public void Put(Guid guid)
        {
            Put(guid.ToByteArray());
        }

        #endregion

        #region Output
        /// <summary>
        /// 读取布尔值，并移动指针
        /// </summary>
        public bool GetBoolean()
        {
            return Get() == 0 ? false : true;
        }
        /// <summary>
        /// 从指定位置读取布尔值
        /// </summary>
        public bool GetBoolean(int index)
        {
            return _Raw[index] == 0 ? false : true;
        }
        /// <summary>
        /// 读取一个字节，并移动指针
        /// </summary>
        public byte Get()
        {
            var value = _Raw[_Position++];
            return value;
        }
        /// <summary>
        /// 从指定位置读取一个字节
        /// </summary>
        public byte Get(int index)
        {
            return _Raw[index];
        }
        /// <summary>
        /// 读取指定长度的字节数组, 并移动指针
        /// </summary>
        public byte[] GetBytes(int count)
        {
            if (count < 0)
                return null;
           
            if (_Position + count > _Raw.Length)
                return null;

            byte[] buffer = new byte[count];

            Buffer.BlockCopy(_Raw, _Position, buffer, 0, count);
            _Position += count;

            return buffer;
        }
        /// <summary>
        /// 从指定位置读取指定长度的字节数组
        /// </summary>
        public byte[] GetBytes(int index, int count)
        {
            if (count < 0)
                return null;

            if (index + count > _Raw.Length)
                return null;

            byte[] buffer = new byte[count];

            Buffer.BlockCopy(_Raw, index, buffer, 0, count);

            return buffer;
        }
        /// <summary>
        /// 读取一个Ascii字符，并移动指针
        /// </summary>
        public char GetChar()
        {
            return Convert.ToChar(Get());
        }
        /// <summary>
        /// 从指定位置读取一个Ascii字符
        /// </summary>
        public char GetChar(int index)
        {
            return Convert.ToChar(_Raw[index]);
        }
        /// <summary>
        /// 读取16位有符号整数, 并移动指针
        /// </summary>
        public short GetShort()
        {
            return (short)(Get() << 8 | Get());
        }
        /// <summary>
        /// 从指定位置读取16位有符号整数
        /// </summary>
        public short GetShort(int index)
        {
            return (short)(_Raw[index++] << 8 | _Raw[index]);
        }
        /// <summary>
        /// 读取16位无符号整数, 并移动指针
        /// </summary>
        public ushort GetUShort()
        {
            return (ushort)(Get() << 8 | Get());
        }
        /// <summary>
        /// 从指定位置读取16位无符号整数
        /// </summary>
        public ushort GetUShort(int index)
        {
            return (ushort)(_Raw[index++] << 8 | _Raw[index]);
        }
        /// <summary>
        /// 读取32位有符号整数，并移动指针
        /// </summary>
        public int GetInt()
        {
            return (int)(Get() << 0x18 | Get() << 0x10 | Get() << 8 | Get());
        }
        /// <summary>
        /// 从指定位置读取32位有符号整数
        /// </summary>
        public int GetInt(int index)
        {
           return (int)(_Raw[index++] << 0x18 | _Raw[index++] << 0x10 | _Raw[index++] << 8 | _Raw[index]);
        }
        /// <summary>
        /// 读取32位无符号整数，并移动指针
        /// </summary>
        public uint GetUInt()
        {
            return (uint)GetInt();
        }
        /// <summary>
        /// 从指定位置读取32位无符号整数
        /// </summary>
        public uint GetUInt(int index)
        {
            return (uint)GetInt(index);
        }
        /// <summary>
        /// 读取64位有符号整数，并移动指针
        /// </summary>
        public long GetLong()
        {
            ulong x = (ulong)GetUInt();
            ulong y = (ulong)GetUInt();
            return (long)((x << 0x20) | y);
        }
        /// <summary>
        /// 从指定位置读取64位有符号整数
        /// </summary>
        public long GetLong(int index)
        {
            ulong x = (ulong)GetUInt(index);
            ulong y = (ulong)GetUInt(index + 4);
            return (long)((x << 0x20) | y);
        }
        /// <summary>
        /// 读取64位无符号整数，并移动指针
        /// </summary>
        public ulong GetULong()
        {
            return (ulong)GetLong();
        }
        /// <summary>
        /// 从指定位置读取64位无符号整数
        /// </summary>
        public ulong GetULong(int index)
        {
            return (ulong)GetLong(index);
        }
        /// <summary>
        /// 读取Guid值,并移动指针
        /// </summary>
        public Guid GetGuid()
        {
            return new Guid(GetBytes(16));
        }

        #endregion

        #region Public Methods
        /// <summary>
        /// 重设指针
        /// </summary>
        public void ResetPosition(int index)
        {
            if (index < 0)
                _Position = 0;
            else if (_Raw != null && index >= _Raw.Length)
                _Position = _Raw.Length - 1;
            else
                _Position = index;
        }
        /// <summary>
        /// 查看是否还可读
        /// </summary>
        public bool Peek()
        {
            if (_Raw == null) return false;
            return _Position < _Raw.Length;
        }
        /// <summary>
        /// 查看还有多少字节可读
        /// </summary>
        /// <returns></returns>
        public int BytesLeft()
        {
            return _Raw.Length - _Position;
        }

        #endregion

    }

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