internal static RowLayout LoadFieldDefinition(DataReader reader, out int version)
{
var dateTimeKind = DateTimeKind.Unspecified;
var dateTimeType = DateTimeType.Undefined;
var stringEncoding = StringEncoding.UTF8;
if (reader.ReadString(8) != "DatTable")
{
throw new FormatException();
}
version = reader.Read7BitEncodedInt32();
if ((version < 1) || (version > 4))
{
throw new InvalidDataException("Unknown Table version!");
}
// read name and create layout
var layoutName = reader.ReadString();
var fieldCount = reader.Read7BitEncodedInt32();
var fields = new FieldProperties[fieldCount];
for (var i = 0; i < fieldCount; i++)
{
var fieldName = reader.ReadString();
var dataType = (DataType)reader.Read7BitEncodedInt32();
var fieldFlags = (FieldFlags)reader.Read7BitEncodedInt32();
var databaseDataType = dataType;
switch (dataType)
{
case DataType.Enum:
databaseDataType = DataType.Int64;
break;
case DataType.User:
case DataType.String:
databaseDataType = DataType.String;
if (version > 2)
{
stringEncoding = (StringEncoding)reader.Read7BitEncodedInt32();
}
else
{
stringEncoding = StringEncoding.UTF8;
}
break;
case DataType.TimeSpan:
if (version > 3)
{
dateTimeType = (DateTimeType)reader.Read7BitEncodedInt32();
}
break;
case DataType.DateTime:
if (version > 1)
{
dateTimeKind = (DateTimeKind)reader.Read7BitEncodedInt32();
dateTimeType = (DateTimeType)reader.Read7BitEncodedInt32();
}
else
{
dateTimeKind = DateTimeKind.Utc;
dateTimeType = DateTimeType.BigIntHumanReadable;
}
break;
}
Type valueType = null;
if ((dataType & DataType.MaskRequireValueType) != 0)
{
var typeName = reader.ReadString();
valueType = AppDom.FindType(typeName.BeforeFirst(','), typeName.AfterFirst(',').Trim());
}
var field = fields[i] = new FieldProperties
{
Index = i,
Flags = fieldFlags,
DataType = dataType,
ValueType = valueType,
Name = fieldName,
TypeAtDatabase = databaseDataType,
NameAtDatabase = fieldName,
DateTimeType = dateTimeType,
DateTimeKind = dateTimeKind,
StringEncoding = stringEncoding
};
field.Validate();
}
return(RowLayout.CreateUntyped(layoutName, fields));
}