private static ObjectActivator ListActivator(Type expectedType)
{
var genericArgs = expectedType.GetGenericArguments();
var argType = genericArgs.Length switch
{
0 => typeof(object),
1 => genericArgs[0],
_ => throw new DeserializationException(
$"Unexpected number of generic arguments for list: {genericArgs.Length}"),
};
ConstructorInfo constructor;
var interfaceType = typeof(ICollection <>).MakeGenericType(argType);
var listType = typeof(List <>).MakeGenericType(argType);
if (expectedType.IsAssignableFrom(listType))
{
constructor = listType.GetConstructor(new[] { typeof(int) });
}
else
{
ReflectionUtil.CheckType(interfaceType, expectedType);
constructor = expectedType.GetConstructor(Type.EmptyTypes);
if (constructor == null)
{
throw new DeserializationException($"Unable to find default constructor for {expectedType}");
}
}
var activator = ReflectionUtil.CreateActivator(constructor);
return(activator);
}
private static ObjectActivator DictionaryActivator(Type expectedType)
{
var genericArgs = expectedType.GetGenericArguments();
if (genericArgs.Length != 2)
{
throw new DeserializationException(
$"Unexpected number of Dictionary generic arguments: {genericArgs.Length}");
}
ConstructorInfo constructor;
if (expectedType.IsInterface)
{
var dictType = typeof(Dictionary <,>).MakeGenericType(genericArgs);
ReflectionUtil.CheckType(expectedType, dictType);
constructor = dictType.GetConstructor(new[] { typeof(int) });
}
else
{
ReflectionUtil.CheckType(typeof(IDictionary), expectedType);
constructor = expectedType.GetConstructor(Type.EmptyTypes);
if (constructor == null)
{
throw new DeserializationException($"Unable to find default constructor for {expectedType}");
}
}
var activator = ReflectionUtil.CreateActivator(constructor);
return(activator);
}
/// <summary>
/// Decodes the boolean.
/// </summary>
/// <param name="expectedType"></param>
/// <param name="size">The size of the structure.</param>
/// <returns></returns>
private static bool DecodeBoolean(Type expectedType, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(bool));
return(size switch
{
0 => false,
1 => true,
_ => throw new InvalidDatabaseException("The MaxMind DB file's data section contains bad data: "
+ "invalid size of boolean."),
});
/// <summary>
/// Decodes the float.
/// </summary>
/// <returns></returns>
private float DecodeFloat(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(float));
if (size != 4)
{
throw new InvalidDatabaseException("The MaxMind DB file's data section contains bad data: "
+ "invalid size of float.");
}
return(_database.ReadFloat(offset));
}
/// <summary>
/// Decodes the double.
/// </summary>
/// <returns></returns>
private double DecodeDouble(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(double));
if (size != 8)
{
throw new InvalidDatabaseException("The MaxMind DB file's data section contains bad data: "
+ "invalid size of double.");
}
return(_database.ReadDouble(offset));
}
/// <summary>
/// Decodes the boolean.
/// </summary>
/// <param name="expectedType"></param>
/// <param name="size">The size of the structure.</param>
/// <returns></returns>
private static bool DecodeBoolean(Type expectedType, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(bool));
switch (size)
{
case 0:
return(false);
case 1:
return(true);
default:
throw new InvalidDatabaseException("The MaxMind DB file's data section contains bad data: "
+ "invalid size of boolean.");
}
}
/// <summary>
/// Decodes the integer.
/// </summary>
/// <returns></returns>
private int DecodeInteger(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(int));
return(_database.ReadInteger(0, offset, size));
}
/// <summary>
/// Decodes the big integer.
/// </summary>
/// <returns></returns>
private BigInteger DecodeBigInteger(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(BigInteger));
return(_database.ReadBigInteger(offset, size));
}
/// <summary>
/// Decodes the uint64.
/// </summary>
/// <returns></returns>
private ulong DecodeUInt64(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(ulong));
return(_database.ReadULong(offset, size));
}
private byte[] DecodeBytes(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(byte[]));
return(_database.Read(offset, size));
}
/// <summary>
/// Decodes the string.
/// </summary>
/// <returns></returns>
private string DecodeString(Type expectedType, long offset, int size)
{
ReflectionUtil.CheckType(expectedType, typeof(string));
return(_database.ReadString(offset, size));
}