private (int, Encoding)? GetLengthAttributeValues(MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var fixedLengthAttribute = fieldAttributes?.FixedLengthAttribute;
var variableLengthAttribute = fieldAttributes?.VariableLengthAttribute;
var calculatedLengthAttribute = fieldAttributes?.CalculatedLengthAttribute;
Encoding stringEncoding;
int length;
if (fixedLengthAttribute != null)
{
stringEncoding = Tools.RetrieveEncoding(fixedLengthAttribute.StringEncoding);
length = fixedLengthAttribute.Length;
}
else if (variableLengthAttribute != null)
{
stringEncoding = Tools.RetrieveEncoding(variableLengthAttribute.StringEncoding);
length = Convert.ToInt32(storage.Get(variableLengthAttribute.FieldName)) + variableLengthAttribute.Offset;
}
else if (calculatedLengthAttribute != null)
{
stringEncoding = Tools.RetrieveEncoding(calculatedLengthAttribute.StringEncoding);
length = calculatedLengthAttribute.CalculationAction(storage);
}
else
{
return(null);
}
return(length, stringEncoding);
}
private object ReadTypeInternal(BinaryReaderX br, Type readType, ValueStorage storage, FieldInfo fieldInfo = null, bool isTypeChosen = false)
{
var typeAttributes = new MemberAttributeInfo(readType);
var fieldAttributes = fieldInfo == null ? null : new MemberAttributeInfo(fieldInfo);
var bkByteOrder = br.ByteOrder;
var bkBitOrder = br.BitOrder;
var bkBlockSize = br.BlockSize;
br.ByteOrder = fieldAttributes?.EndiannessAttribute?.ByteOrder ??
typeAttributes.EndiannessAttribute?.ByteOrder ??
br.ByteOrder;
object returnValue;
if (IsTypeChoice(fieldAttributes) && !isTypeChosen)
{
var chosenType = ChooseType(readType, fieldAttributes, storage);
returnValue = ReadTypeInternal(br, chosenType, storage, fieldInfo, true);
}
else if (readType.IsPrimitive)
{
returnValue = ReadTypePrimitive(br, readType);
}
else if (readType == typeof(string))
{
returnValue = ReadTypeString(br, fieldAttributes, storage);
}
else if (readType == typeof(decimal))
{
returnValue = br.ReadDecimal();
}
else if (Tools.IsList(readType))
{
returnValue = ReadTypeList(br, readType, fieldAttributes, storage, fieldInfo?.Name);
}
else if (readType.IsClass || Tools.IsStruct(readType))
{
returnValue = ReadTypeClass(br, readType, storage.CreateScope(fieldInfo?.Name));
}
else if (readType.IsEnum)
{
returnValue = ReadTypeInternal(br, readType.GetEnumUnderlyingType(), storage);
}
else
{
throw new UnsupportedTypeException(readType);
}
br.ByteOrder = bkByteOrder;
br.BitOrder = bkBitOrder;
br.BlockSize = bkBlockSize;
return(returnValue);
}
private object ReadTypeClass(BinaryReaderX br, Type readType, ValueStorage storage)
{
var typeAttributes = new MemberAttributeInfo(readType);
var bitFieldInfoAttribute = typeAttributes.BitFieldInfoAttribute;
var alignmentAttribute = typeAttributes.AlignmentAttribute;
if (bitFieldInfoAttribute != null)
{
br.ResetBitBuffer();
}
br.BitOrder = (bitFieldInfoAttribute?.BitOrder != BitOrder.Default ? bitFieldInfoAttribute?.BitOrder : br.BitOrder) ?? br.BitOrder;
br.BlockSize = bitFieldInfoAttribute?.BlockSize ?? br.BlockSize;
if (br.BlockSize != 8 && br.BlockSize != 4 && br.BlockSize != 2 && br.BlockSize != 1)
{
throw new InvalidBitFieldInfoException(br.BlockSize);
}
var item = Activator.CreateInstance(readType);
var fields = readType.GetFields().OrderBy(fi => fi.MetadataToken);
foreach (var field in fields)
{
// If field condition is false, read no value and leave field to default
var conditionAttribute = field.GetCustomAttribute <ConditionAttribute>();
if (!ResolveCondition(conditionAttribute, storage))
{
continue;
}
var bitInfo = field.GetCustomAttribute <BitFieldAttribute>();
object fieldValue;
if (bitInfo != null)
{
fieldValue = Convert.ChangeType(br.ReadBits(bitInfo.BitLength), field.FieldType);
}
else
{
fieldValue = ReadTypeInternal(br, field.FieldType, storage, field);
}
storage.Add(field.Name, fieldValue);
field.SetValue(item, fieldValue);
}
if (alignmentAttribute != null)
{
br.SeekAlignment(alignmentAttribute.Alignment);
}
return(item);
}
private object ReadTypeString(BinaryReaderX br, MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var attributeValues = GetLengthAttributeValues(fieldAttributes, storage);
if (attributeValues.HasValue)
{
var(length, encoding) = attributeValues.Value;
return(br.ReadString(length, encoding));
}
return(null);
}
private void WriteTypeClass(BinaryWriterX bw, object writeValue, Type writeType, ValueStorage storage)
{
var typeAttributes = new MemberAttributeInfo(writeType);
var bitFieldInfoAttribute = typeAttributes.BitFieldInfoAttribute;
var alignmentAttribute = typeAttributes.AlignmentAttribute;
if (bitFieldInfoAttribute != null)
{
bw.Flush();
}
bw.BitOrder = (bitFieldInfoAttribute?.BitOrder != BitOrder.Default ? bitFieldInfoAttribute?.BitOrder : bw.BitOrder) ?? bw.BitOrder;
bw.BlockSize = bitFieldInfoAttribute?.BlockSize ?? bw.BlockSize;
if (bw.BlockSize != 8 && bw.BlockSize != 4 && bw.BlockSize != 2 && bw.BlockSize != 1)
{
throw new InvalidBitFieldInfoException(bw.BlockSize);
}
var fields = writeType.GetFields().OrderBy(fi => fi.MetadataToken);
foreach (var field in fields)
{
// If field condition is false, write no value and ignore field
var conditionAttribute = field.GetCustomAttribute <ConditionAttribute>();
if (!ResolveCondition(conditionAttribute, storage))
{
continue;
}
var fieldValue = field.GetValue(writeValue);
storage.Add(field.Name, fieldValue);
var bitInfo = field.GetCustomAttribute <BitFieldAttribute>();
if (bitInfo != null)
{
bw.WriteBits(Convert.ToInt64(fieldValue), bitInfo.BitLength);
}
else
{
WriteTypeInternal(bw, fieldValue, storage, field);
}
}
bw.Flush();
// Apply alignment
if (alignmentAttribute != null)
{
bw.WriteAlignment(alignmentAttribute.Alignment);
}
}
private object ReadTypeString(BinaryReaderX br, MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var attributeValues = GetLengthAttributeValues(fieldAttributes, storage);
// If no length attributes are given, assume string with 7bit-encoded int length prefixing the string
if (!attributeValues.HasValue)
{
return(br.ReadString());
}
var(length, encoding) = attributeValues.Value;
return(br.ReadString(length, encoding));
}
private void WriteTypeString(BinaryWriterX bw, string writeValue, MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var attributeValues = GetLengthAttributeValues(fieldAttributes, storage);
// If no length attributes are given, assume string with 7bit-encoded int length prefixing the string
if (!attributeValues.HasValue)
{
bw.Write(writeValue);
return;
}
var(length, encoding) = attributeValues.Value;
bw.Write(ConvertStringValue(writeValue, encoding, length));
}
private void WriteTypeInternal(BinaryWriterX bw, object writeValue, ValueStorage storage, FieldInfo fieldInfo = null, bool isTypeChose = false)
{
var writeType = writeValue.GetType();
var typeAttributes = new MemberAttributeInfo(writeType);
var fieldAttributes = fieldInfo == null ? null : new MemberAttributeInfo(fieldInfo);
var bkByteOrder = bw.ByteOrder;
var bkBitOrder = bw.BitOrder;
var bkBlockSize = bw.BlockSize;
bw.ByteOrder = fieldAttributes?.EndiannessAttribute?.ByteOrder ??
typeAttributes.EndiannessAttribute?.ByteOrder ??
bw.ByteOrder;
if (writeType.IsPrimitive)
{
WriteTypePrimitive(bw, writeValue, writeType);
}
else if (writeType == typeof(string))
{
WriteTypeString(bw, (string)writeValue, fieldAttributes, storage);
}
else if (writeType == typeof(decimal))
{
bw.Write((decimal)writeValue);
}
else if (Tools.IsList(writeType))
{
WriteTypeList(bw, (IList)writeValue, fieldAttributes, storage);
}
else if (writeType.IsClass || Tools.IsStruct(writeType))
{
WriteTypeClass(bw, writeValue, writeType, storage.CreateScope(fieldInfo?.Name));
}
else if (writeType.IsEnum)
{
var underlyingType = (writeType as TypeInfo)?.DeclaredFields.ToList()[0];
WriteTypeInternal(bw, underlyingType?.GetValue(writeValue), storage);
}
else
{
throw new UnsupportedTypeException(writeType);
}
bw.ByteOrder = bkByteOrder;
bw.BitOrder = bkBitOrder;
bw.BlockSize = bkBlockSize;
}
private void WriteTypeString(BinaryWriterX bw, string writeValue, MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var attributeValues = GetLengthAttributeValues(fieldAttributes, storage);
if (!attributeValues.HasValue)
{
return;
}
var(length, encoding) = attributeValues.Value;
if (encoding.GetByteCount(writeValue) != length)
{
throw new FieldLengthMismatchException(encoding.GetByteCount(writeValue), length);
}
bw.WriteString(writeValue, encoding, false, false);
}
private object ReadTypeList(BinaryReaderX br, Type readType, MemberAttributeInfo fieldAttributes, ValueStorage storage, string listFieldName)
{
var attributeValues = GetLengthAttributeValues(fieldAttributes, storage);
if (!attributeValues.HasValue)
{
return(null);
}
var(length, _) = attributeValues.Value;
IList list;
Type elementType;
if (readType.IsArray)
{
elementType = readType.GetElementType();
list = Array.CreateInstance(elementType, length);
}
else
{
elementType = readType.GetGenericArguments()[0];
list = (IList)Activator.CreateInstance(readType);
}
for (var i = 0; i < length; i++)
{
var elementValue = ReadTypeInternal(br, elementType, storage.CreateScope($"{listFieldName}[{i}]"));
if (list.IsFixedSize)
{
list[i] = elementValue;
}
else
{
list.Add(elementValue);
}
}
return(list);
}
private void WriteTypeList(BinaryWriterX bw, IList writeValue, MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var attributeValues = GetLengthAttributeValues(fieldAttributes, storage);
if (!attributeValues.HasValue)
{
return;
}
var(length, _) = attributeValues.Value;
if (writeValue.Count != length)
{
throw new FieldLengthMismatchException(writeValue.Count, length);
}
var listCounter = 0;
foreach (var element in writeValue)
{
WriteTypeInternal(bw, element, storage.CreateScope($"[{listCounter++}]"));
}
}
private Type ChooseType(Type readType, MemberAttributeInfo fieldAttributes, ValueStorage storage)
{
var typeChoices = fieldAttributes.TypeChoiceAttributes.ToArray();
if (readType != typeof(object) && typeChoices.Any(x => !readType.IsAssignableFrom(x.InjectionType)))
{
throw new InvalidOperationException($"Not all type choices are injectable to '{readType.Name}'.");
}
Type chosenType = null;
foreach (var typeChoice in typeChoices)
{
if (!storage.Exists(typeChoice.FieldName))
{
throw new InvalidOperationException($"Field '{typeChoice.FieldName}' could not be found.");
}
var value = storage.Get(typeChoice.FieldName);
switch (typeChoice.Comparer)
{
case TypeChoiceComparer.Equal:
if (Convert.ToUInt64(value) == Convert.ToUInt64(typeChoice.Value))
{
chosenType = typeChoice.InjectionType;
}
break;
case TypeChoiceComparer.Greater:
if (Convert.ToUInt64(value) > Convert.ToUInt64(typeChoice.Value))
{
chosenType = typeChoice.InjectionType;
}
break;
case TypeChoiceComparer.Smaller:
if (Convert.ToUInt64(value) < Convert.ToUInt64(typeChoice.Value))
{
chosenType = typeChoice.InjectionType;
}
break;
case TypeChoiceComparer.GEqual:
if (Convert.ToUInt64(value) >= Convert.ToUInt64(typeChoice.Value))
{
chosenType = typeChoice.InjectionType;
}
break;
case TypeChoiceComparer.SEqual:
if (Convert.ToUInt64(value) <= Convert.ToUInt64(typeChoice.Value))
{
chosenType = typeChoice.InjectionType;
}
break;
default:
throw new InvalidOperationException($"Unknown comparer {typeChoice.Comparer}.");
}
if (chosenType != null)
{
break;
}
}
if (chosenType == null)
{
throw new InvalidOperationException($"No choice matched the criteria for injection");
}
return(chosenType);
}
private bool IsTypeChoice(MemberAttributeInfo fieldAttributes)
{
return(fieldAttributes?.TypeChoiceAttributes?.Any() ?? false);
}