using System;
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using WIDESEAWCS_S7Simulator.Core.Interfaces;
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namespace WIDESEAWCS_S7Simulator.Core.Memory
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{
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/// <summary>
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/// M区（位存储器/Merker）实现
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/// </summary>
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public class MRegion : MemoryRegion, IMemoryRegion
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{
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/// <summary>
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/// 区域类型
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/// </summary>
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public override string RegionType => "M";
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="size">区域大小（字节）</param>
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public MRegion(int size) : base(size)
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{
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}
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/// <summary>
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/// 读取位
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/// </summary>
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/// <param name="byteOffset">字节偏移</param>
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/// <param name="bitOffset">位偏移（0-7）</param>
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/// <returns>位值</returns>
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public bool ReadBit(ushort byteOffset, byte bitOffset)
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{
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if (bitOffset > 7)
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throw new ArgumentOutOfRangeException(nameof(bitOffset), "位偏移必须在0-7之间");
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_lock.EnterReadLock();
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try
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{
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if (byteOffset >= Size)
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throw new ArgumentOutOfRangeException(nameof(byteOffset), "字节偏移超出范围");
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return (_memory[byteOffset] & (1 << bitOffset)) != 0;
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}
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finally
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{
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_lock.ExitReadLock();
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}
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}
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/// <summary>
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/// 写入位
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/// </summary>
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/// <param name="byteOffset">字节偏移</param>
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/// <param name="bitOffset">位偏移（0-7）</param>
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/// <param name="value">位值</param>
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public void WriteBit(ushort byteOffset, byte bitOffset, bool value)
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{
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if (bitOffset > 7)
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throw new ArgumentOutOfRangeException(nameof(bitOffset), "位偏移必须在0-7之间");
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_lock.EnterWriteLock();
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try
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{
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if (byteOffset >= Size)
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throw new ArgumentOutOfRangeException(nameof(byteOffset), "字节偏移超出范围");
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if (value)
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_memory[byteOffset] |= (byte)(1 << bitOffset);
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else
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_memory[byteOffset] &= (byte)~(1 << bitOffset);
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}
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finally
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{
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_lock.ExitWriteLock();
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}
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}
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/// <summary>
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/// 读取字（Word，2字节）
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/// </summary>
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public ushort ReadWord(ushort byteOffset)
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{
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var data = Read(byteOffset, 2);
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return (ushort)((data[0] << 8) | data[1]);
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}
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/// <summary>
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/// 写入字（Word，2字节）
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/// </summary>
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public void WriteWord(ushort byteOffset, ushort value)
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{
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var data = new byte[] { (byte)(value >> 8), (byte)(value & 0xFF) };
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Write(byteOffset, data);
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}
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/// <summary>
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/// 读取双字（DWord，4字节）
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/// </summary>
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public uint ReadDWord(ushort byteOffset)
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{
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var data = Read(byteOffset, 4);
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return (uint)((data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3]);
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}
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/// <summary>
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/// 写入双字（DWord，4字节）
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/// </summary>
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public void WriteDWord(ushort byteOffset, uint value)
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{
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var data = new byte[] {
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(byte)(value >> 24),
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(byte)((value >> 16) & 0xFF),
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(byte)((value >> 8) & 0xFF),
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(byte)(value & 0xFF)
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};
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Write(byteOffset, data);
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}
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/// <summary>
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/// 读取整数（Int，2字节，有符号）
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/// </summary>
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public short ReadInt(ushort byteOffset)
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{
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return (short)ReadWord(byteOffset);
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}
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/// <summary>
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/// 写入整数（Int，2字节，有符号）
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/// </summary>
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public void WriteInt(ushort byteOffset, short value)
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{
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WriteWord(byteOffset, (ushort)value);
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}
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/// <summary>
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/// 读取双整数（DInt，4字节，有符号）
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/// </summary>
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public int ReadDInt(ushort byteOffset)
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{
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return (int)ReadDWord(byteOffset);
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}
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/// <summary>
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/// 写入双整数（DInt，4字节，有符号）
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/// </summary>
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public void WriteDInt(ushort byteOffset, int value)
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{
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WriteDWord(byteOffset, (uint)value);
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}
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/// <summary>
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/// 读取浮点数（Real，4字节）
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/// </summary>
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public float ReadReal(ushort byteOffset)
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{
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var bytes = Read(byteOffset, 4);
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return BitConverter.ToSingle(bytes, 0);
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}
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/// <summary>
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/// 写入浮点数（Real，4字节）
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/// </summary>
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public void WriteReal(ushort byteOffset, float value)
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{
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var bytes = BitConverter.GetBytes(value);
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Write(byteOffset, bytes);
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}
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}
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}
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