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Struct.cs
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364 lines (344 loc) · 16.4 KB
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using System;
using System.Linq;
using System.Reflection;
namespace S7.Net.Types
{
/// <summary>
/// Contains the method to convert a C# struct to S7 data types
/// </summary>
public static class Struct
{
/// <summary>
/// Gets the size of the struct in bytes.
/// </summary>
/// <param name="structType">the type of the struct</param>
/// <returns>the number of bytes</returns>
public static int GetStructSize(Type structType)
{
double numBytes = 0.0;
var infos = structType
#if NETSTANDARD1_3
.GetTypeInfo().DeclaredFields;
#else
.GetFields();
#endif
int count = 0;
foreach (var info in infos)
{
count++;
var type = info.FieldType;
string name = info.FieldType.Name;
if (type.BaseType == typeof(System.Enum))
name = Enum.GetUnderlyingType(type).Name;
switch (name)
{
case "Boolean":
numBytes += 0.125;
break;
case "Byte":
numBytes = Math.Ceiling(numBytes);
numBytes++;
break;
case "Int16":
case "UInt16":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
numBytes += 2;
break;
case "Int32":
case "UInt32":
case "TimeSpan":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
numBytes += 4;
break;
case "Single":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
numBytes += 4;
break;
case "Double":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
numBytes += 8;
break;
case "String":
S7StringAttribute? attribute = info.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
if (attribute == default(S7StringAttribute))
throw new ArgumentException("Please add S7StringAttribute to the string field");
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
numBytes += attribute.ReservedLengthInBytes;
break;
default:
numBytes += GetStructSize(info.FieldType);
if (count != infos.Count()) {
if(numBytes % 2 != 0)
numBytes++;//word align
}
break;
}
}
return (int)Math.Ceiling(numBytes); //For example: 9 bool data, length = 1.125, but actually occupies 2 bytes
}
/// <summary>
/// Creates a struct of a specified type by an array of bytes.
/// </summary>
/// <param name="structType">The struct type</param>
/// <param name="bytes">The array of bytes</param>
/// <returns>The object depending on the struct type or null if fails(array-length != struct-length</returns>
public static object? FromBytes(Type structType, byte[] bytes)
{
if (bytes == null)
return null;
if (bytes.Length != GetStructSize(structType))
return null;
// and decode it
int bytePos = 0;
int bitPos = 0;
double numBytes = 0.0;
object structValue = Activator.CreateInstance(structType) ??
throw new ArgumentException($"Failed to create an instance of the type {structType}.", nameof(structType));
var infos = structValue.GetType()
#if NETSTANDARD1_3
.GetTypeInfo().DeclaredFields;
#else
.GetFields();
#endif
foreach (var info in infos)
{
var type = info.FieldType;
string name = info.FieldType.Name;
if (type.BaseType == typeof(System.Enum))
name = Enum.GetUnderlyingType(type).Name;
switch (name)
{
case "Boolean":
// get the value
bytePos = (int)Math.Floor(numBytes);
bitPos = (int)((numBytes - (double)bytePos) / 0.125);
if ((bytes[bytePos] & (int)Math.Pow(2, bitPos)) != 0)
info.SetValue(structValue, true);
else
info.SetValue(structValue, false);
numBytes += 0.125;
break;
case "Byte":
numBytes = Math.Ceiling(numBytes);
info.SetValue(structValue, (byte)(bytes[(int)numBytes]));
numBytes++;
break;
case "Int16":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
ushort source = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
info.SetValue(structValue, source.ConvertToShort());
numBytes += 2;
break;
case "UInt16":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
info.SetValue(structValue, Word.FromBytes(bytes[(int)numBytes + 1],
bytes[(int)numBytes]));
numBytes += 2;
break;
case "Int32":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
uint sourceUInt = DWord.FromBytes(bytes[(int)numBytes + 3],
bytes[(int)numBytes + 2],
bytes[(int)numBytes + 1],
bytes[(int)numBytes + 0]);
info.SetValue(structValue, sourceUInt.ConvertToInt());
numBytes += 4;
break;
case "UInt32":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
info.SetValue(structValue, DWord.FromBytes(bytes[(int)numBytes],
bytes[(int)numBytes + 1],
bytes[(int)numBytes + 2],
bytes[(int)numBytes + 3]));
numBytes += 4;
break;
case "Single":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
info.SetValue(structValue, Real.FromByteArray(new byte[] { bytes[(int)numBytes],
bytes[(int)numBytes + 1],
bytes[(int)numBytes + 2],
bytes[(int)numBytes + 3] }));
numBytes += 4;
break;
case "Double":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
var data = new byte[8];
Array.Copy(bytes, (int)numBytes, data, 0, 8);
info.SetValue(structValue, LReal.FromByteArray(data));
numBytes += 8;
break;
case "String":
S7StringAttribute? attribute = info.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
if (attribute == default(S7StringAttribute))
throw new ArgumentException("Please add S7StringAttribute to the string field");
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
var sData = new byte[attribute.ReservedLengthInBytes];
Array.Copy(bytes, (int)numBytes, sData, 0, sData.Length);
switch (attribute.Type)
{
case S7StringType.S7String:
info.SetValue(structValue, S7String.FromByteArray(sData));
break;
case S7StringType.S7WString:
info.SetValue(structValue, S7WString.FromByteArray(sData));
break;
default:
throw new ArgumentException("Please use a valid string type for the S7StringAttribute");
}
numBytes += sData.Length;
break;
case "TimeSpan":
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
// get the value
info.SetValue(structValue, TimeSpan.FromByteArray(new[]
{
bytes[(int)numBytes + 0],
bytes[(int)numBytes + 1],
bytes[(int)numBytes + 2],
bytes[(int)numBytes + 3]
}));
numBytes += 4;
break;
default:
var buffer = new byte[GetStructSize(info.FieldType)];
if (buffer.Length == 0)
continue;
Buffer.BlockCopy(bytes, (int)Math.Ceiling(numBytes), buffer, 0, buffer.Length);
info.SetValue(structValue, FromBytes(info.FieldType, buffer));
numBytes += buffer.Length;
if(numBytes %2 != 0) //word align
numBytes++;
break;
}
}
return structValue;
}
/// <summary>
/// Creates a byte array depending on the struct type.
/// </summary>
/// <param name="structValue">The struct object</param>
/// <returns>A byte array or null if fails.</returns>
public static byte[] ToBytes(object structValue)
{
Type type = structValue.GetType();
int size = Struct.GetStructSize(type);
byte[] bytes = new byte[size];
byte[]? bytes2 = null;
int bytePos = 0;
int bitPos = 0;
double numBytes = 0.0;
var infos = type
#if NETSTANDARD1_3
.GetTypeInfo().DeclaredFields;
#else
.GetFields();
#endif
foreach (var info in infos)
{
static TValue GetValueOrThrow<TValue>(FieldInfo fi, object structValue) where TValue : struct
{
var value = fi.GetValue(structValue) as TValue? ??
throw new ArgumentException($"Failed to convert value of field {fi.Name} of {structValue} to type {typeof(TValue)}");
return value;
}
bytes2 = null;
switch (info.FieldType.Name)
{
case "Boolean":
// get the value
bytePos = (int)Math.Floor(numBytes);
bitPos = (int)((numBytes - (double)bytePos) / 0.125);
if (GetValueOrThrow<bool>(info, structValue))
bytes[bytePos] |= (byte)Math.Pow(2, bitPos); // is true
else
bytes[bytePos] &= (byte)(~(byte)Math.Pow(2, bitPos)); // is false
numBytes += 0.125;
break;
case "Byte":
numBytes = (int)Math.Ceiling(numBytes);
bytePos = (int)numBytes;
bytes[bytePos] = GetValueOrThrow<byte>(info, structValue);
numBytes++;
break;
case "Int16":
bytes2 = Int.ToByteArray(GetValueOrThrow<short>(info, structValue));
break;
case "UInt16":
bytes2 = Word.ToByteArray(GetValueOrThrow<ushort>(info, structValue));
break;
case "Int32":
bytes2 = DInt.ToByteArray(GetValueOrThrow<int>(info, structValue));
break;
case "UInt32":
bytes2 = DWord.ToByteArray(GetValueOrThrow<uint>(info, structValue));
break;
case "Single":
bytes2 = Real.ToByteArray(GetValueOrThrow<float>(info, structValue));
break;
case "Double":
bytes2 = LReal.ToByteArray(GetValueOrThrow<double>(info, structValue));
break;
case "String":
S7StringAttribute? attribute = info.GetCustomAttributes<S7StringAttribute>().SingleOrDefault();
if (attribute == default(S7StringAttribute))
throw new ArgumentException("Please add S7StringAttribute to the string field");
bytes2 = attribute.Type switch
{
S7StringType.S7String => S7String.ToByteArray((string?)info.GetValue(structValue), attribute.ReservedLength),
S7StringType.S7WString => S7WString.ToByteArray((string?)info.GetValue(structValue), attribute.ReservedLength),
_ => throw new ArgumentException("Please use a valid string type for the S7StringAttribute")
};
break;
case "TimeSpan":
bytes2 = TimeSpan.ToByteArray((System.TimeSpan)info.GetValue(structValue));
break;
}
if (bytes2 != null)
{
// add them
numBytes = Math.Ceiling(numBytes);
if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
numBytes++;
bytePos = (int)numBytes;
for (int bCnt = 0; bCnt < bytes2.Length; bCnt++)
bytes[bytePos + bCnt] = bytes2[bCnt];
numBytes += bytes2.Length;
}
}
return bytes;
}
}
}