private unsafe void ReadFields()
{
fields = new NDBField[header.fieldCount];
fieldNameToIndexDic.Clear();
fixed(byte *bytePtr = &datas[header.fieldOffset])
{
int fieldOffset = 0;
int byteOffset = 0;
for (int i = 0; i < header.fieldCount; ++i)
{
NDBField field = new NDBField();
fields[i] = field;
NDBFieldType fieldType = (NDBFieldType)(*(bytePtr + byteOffset));
byteOffset += sizeof(byte);
int fieldNameLen = *((int *)(bytePtr + byteOffset));
byteOffset += sizeof(int);
string fieldName = Encoding.UTF8.GetString(datas, header.fieldOffset + byteOffset, fieldNameLen);
byteOffset += fieldNameLen;
field.Type = fieldType;
field.Name = fieldName;
field.Offset = fieldOffset;
fieldOffset += NDBFieldUtil.GetFieldOffset(fieldType);
}
}
}
private static NDBFieldType GetNDBFieldType(Field field)
{
FieldType fieldType = field.FieldType;
if (fieldType == FieldType.List)
{
ListField listField = (ListField)field;
FieldType valueType = listField.ValueType;
NDBFieldType ndbFieldType = GetNDBFieldType(valueType);
return((NDBFieldType)(ndbFieldType + 100));
}
else
{
return(GetNDBFieldType(fieldType));
}
}
private static byte[] GetFieldBytes(List <Field> fields, out int dataSize)
{
dataSize = 0;
MemoryStream stream = new MemoryStream();
foreach (var field in fields)
{
NDBFieldType ndbFieldType = GetNDBFieldType(field);
dataSize += NDBConst.GetFieldSize(ndbFieldType);
string fieldNameValue = field.Name;
byte[] fieldTypeBytes = BitConverter.GetBytes((int)ndbFieldType);
byte[] fieldNameBytes = Encoding.UTF8.GetBytes(fieldNameValue);
byte[] fieldNameLenBytes = BitConverter.GetBytes(fieldNameBytes.Length);
stream.Write(fieldTypeBytes, 0, fieldTypeBytes.Length);
stream.Write(fieldNameLenBytes, 0, fieldNameLenBytes.Length);
stream.Write(fieldNameBytes, 0, fieldNameBytes.Length);
}
return(stream.ToArray());
}
public static int GetFieldSize(NDBFieldType fieldType)
{
if (fieldType == NDBFieldType.Null)
{
return(0);
}
else if (fieldType == NDBFieldType.Bool)
{
return(sizeof(bool));
}
else if (fieldType == NDBFieldType.Float)
{
return(sizeof(float));
}
else if (fieldType == NDBFieldType.Long)
{
return(sizeof(long));
}
else
{
return(sizeof(int));
}
}
public static int GetFieldOffset(NDBFieldType fieldType)
{
if (fieldType == NDBFieldType.Bool)
{
return(sizeof(bool));
}
else if (fieldType == NDBFieldType.Int || fieldType == NDBFieldType.String || fieldType == NDBFieldType.Text)
{
return(sizeof(int));
}
else if (fieldType == NDBFieldType.Long)
{
return(sizeof(long));
}
else if (fieldType == NDBFieldType.Float)
{
return(sizeof(float));
}
else
{
return(0);
}
}
