public static void ReadFormat(FormatToken.Format f, TdsResponseStream stream)
{
var t = _types[f.Type];
if (t.FormatFormat == FormatFormat.LenOneByte || t.FormatFormat == FormatFormat.Decimal)
{
f.Len = stream.Read();
}
if (t.FormatFormat == FormatFormat.LenFourBytes || t.FormatFormat == FormatFormat.Image)
{
f.Len = stream.ReadInt();
}
if (t.FormatFormat == FormatFormat.Image)
{
int nameLen = stream.ReadShort();
f.ObjectName = stream.ReadString(nameLen);
}
if (t.FormatFormat == FormatFormat.Decimal)
{
f.Pecision = stream.Read();
f.Scale = stream.Read();
}
int localLen = stream.Read();
f.LocaleInfo = stream.ReadString(localLen);
// todo: blob
}
private TdsToken CreateFormat(TokenDescriptor tokenDesc, TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
int len;
if (tokenDesc.Len == TokenLength.FourByteLen)
{
len = stream.ReadInt();
}
else
{
len = stream.ReadShort();
}
int numFormats = stream.ReadShort();
var formats = new List <FormatToken.Format>();
for (int i = 0; i < numFormats; i++)
{
var f = new FormatToken.Format
{
Params = tokenDesc.TokenType == TokenType.TDS_PARAMFMT || tokenDesc.TokenType == TokenType.TDS_PARAMFMT2,
};
int nameLen = stream.Read();
f.Name = stream.ReadString(nameLen);
if (tokenDesc.TokenType == TokenType.TDS_ROWFMT2)
{
int catalogNameLen = stream.Read();
f.CatalogName = stream.ReadString(catalogNameLen);
int schemaNameLen = stream.Read();
f.SchemaName = stream.ReadString(schemaNameLen);
int tableNameLen = stream.Read();
f.TableName = stream.ReadString(tableNameLen);
int columnNameLen = stream.Read();
f.ColumnName = stream.ReadString(columnNameLen);
}
if (tokenDesc.Len == TokenLength.FourByteLen)
{
f.Status = stream.ReadInt();
}
else
{
f.Status = stream.Read();
}
f.UserType = (UserDataType)stream.ReadInt();
f.Type = (TdsType)stream.Read();
TypeReader.ReadFormat(f, stream);
formats.Add(f);
}
return(new FormatToken(tokenDesc.TokenType)
{
Formats = formats,
});
}
private static object GetDecimalValue(TdsResponseStream stream, TdsType type, FormatToken.Format f)
{
int len = stream.Read();
if (len > 0)
{
var scale = Math.Pow(10, f.Scale ?? 0);
bool sign = stream.Read() != 0;
var bytes = stream.ReadBytes(len - 1);
var bi = new BigInteger(bytes.Reverse().ToArray());
var d = (decimal)bi;
if (sign)
{
d = -d;
}
return(d / (decimal)scale);
}
else
{
return(null);
}
}
public static object ReadData(FormatToken.Format f, TdsResponseStream stream, Encoding encoder)
{
int len;
switch (f.Type)
{
case TdsType.TDS_INTN:
case TdsType.TDS_UINTN: // lets ignore unsigned for now
switch (stream.Read())
{
case 1:
return(stream.Read());
case 2:
return(stream.ReadShort());
case 4:
return(stream.ReadInt());
case 8:
return(stream.ReadLong());
}
break;
case TdsType.TDS_INT1:
case TdsType.TDS_UINT1:
return(stream.Read());
case TdsType.TDS_INT2:
case TdsType.TDS_UINT2:
return(stream.ReadShort());
case TdsType.TDS_INT4:
case TdsType.TDS_UINT4:
return(stream.ReadInt());
case TdsType.TDS_INT8:
case TdsType.TDS_UINT8:
return(stream.ReadLong());
case TdsType.TDS_BIT:
return(stream.Read() != 0);
case TdsType.TDS_DATETIMEN:
case TdsType.TDS_DATETIME:
case TdsType.TDS_SHORTDATE:
return(GetDatetimeValue(stream, f.Type));
case TdsType.TDS_FLT4:
return(BitConverter.Int32BitsToSingle(stream.ReadInt()));
case TdsType.TDS_FLT8:
return(BitConverter.Int64BitsToDouble(stream.ReadLong()));
case TdsType.TDS_FLTN:
len = stream.Read();
if (len == 4)
{
return(BitConverter.Int32BitsToSingle(stream.ReadInt()));
}
else if (len == 8)
{
return(BitConverter.Int64BitsToDouble(stream.ReadLong()));
}
break;
case TdsType.TDS_SHORTMONEY:
case TdsType.TDS_MONEY:
case TdsType.TDS_MONEYN:
return(GetMoneyValue(stream, f.Type));
case TdsType.TDS_DECN:
case TdsType.TDS_NUMN:
return(GetDecimalValue(stream, f.Type, f));
case TdsType.TDS_LONGBINARY:
len = stream.ReadInt();
return(stream.ReadBytes(len));
case TdsType.TDS_LONGCHAR:
len = stream.ReadInt();
if (len > 0)
{
return(encoder.GetString(stream.ReadBytes(len)));
}
break;
case TdsType.TDS_IMAGE:
len = stream.Read();
if (len > 0)
{
var txtPtr = stream.ReadBytes(len);
var timeStamp = stream.ReadBytes(8);
int dataLen = stream.ReadInt();
return(stream.ReadBytes(dataLen));
}
break;
case TdsType.TDS_TEXT:
len = stream.Read();
if (len > 0)
{
var txtPtr = stream.ReadBytes(len);
var timeStamp = stream.ReadBytes(8);
int dataLen = stream.ReadInt();
return(encoder.GetString(stream.ReadBytes(dataLen)));
}
break;
case TdsType.TDS_CHAR:
case TdsType.TDS_VARCHAR:
len = stream.Read();
if (len > 0)
{
return(encoder.GetString(stream.ReadBytes(len)));
}
break;
case TdsType.TDS_BINARY:
case TdsType.TDS_VARBINARY:
case TdsType.TDS_BOUNDARY:
case TdsType.TDS_SENSITIVITY:
len = stream.Read();
return(stream.ReadBytes(len));
case TdsType.TDS_VOID:
case TdsType.TDS_BLOB:
default:
throw new NotImplementedException();
}
return(null);
}
