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 CreateEnvChange(TokenDescriptor tokenDesc, TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
int len = stream.ReadShort();
int read = 0;
var changes = new List <EnvChangeToken.Change>();
while (read < len)
{
var change = new EnvChangeToken.Change();
change.Type = (EnvChangeToken.EnvType)stream.Read();
int newValLen = stream.Read();
change.NewValue = stream.ReadString(newValLen);
int oldValLen = stream.Read();
change.OldValue = stream.ReadString(oldValLen);
read += 3 + newValLen + oldValLen;
changes.Add(change);
}
return(new EnvChangeToken(tokenDesc.TokenType)
{
Changes = changes
});
}
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 TdsToken ReadToken(TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
var tokenType = (TokenType)stream.Read();
TdsToken token = null;
TokenDescriptor desc;
if (_tokenDescriptors.TryGetValue(tokenType, out desc))
{
if (desc.Builder == null)
{
token = CreateNotImplementedToken(desc, stream);
}
else
{
//_logger?.LogTrace($"Building token of type {tokenType}");
token = desc.Builder(desc, stream, encoder, lastFormat);
_logger?.LogTrace(token.ToString());
}
}
else
{
_logger?.LogError($"Unknown token of type {tokenType}");
throw new Exception($"Unknown token of type {tokenType}");
}
return(token);
}
private static object GetMoneyValue(TdsResponseStream stream, TdsType type)
{
int len;
if (type == TdsType.TDS_MONEY)
{
len = 8;
}
else if (type == TdsType.TDS_MONEYN)
{
len = stream.Read();
}
else
{
len = 4;
}
long?x = null;
if (len == 4)
{
x = stream.ReadInt();
}
else if (len == 8)
{
int hi = stream.ReadInt();
int lo = stream.ReadInt();
x = lo | (hi << 32);
}
return(x.HasValue ? new decimal(x.Value) * 0.0001m : (decimal?)null);
}
private TdsToken CreateLoginAck(TokenDescriptor tokenDesc, TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
int len = stream.ReadShort();
int status = stream.Read();
var version = stream.ReadBytes(4);
int nameLen = stream.Read();
var name = stream.ReadString(nameLen);
var progVersion = stream.ReadBytes(4);
return(new LoginAckToken(tokenDesc.TokenType)
{
Succeed = status == 5,
Fail = status == 6,
Negotiate = status == 7,
TdsVersion = $"{version[0]}.{version[1]}.{version[2]}.{version[3]}",
ServerProgram = name,
ServerVersion = $"{progVersion[0]}.{progVersion[1]}.{progVersion[2]}.{progVersion[3]}",
});
}
private TdsToken CreateNotImplementedToken(TokenDescriptor tokenDesc, TdsResponseStream stream)
{
int len = 0;
switch (tokenDesc.Len)
{
case TokenLength.OneByteLen:
len = stream.Read();
stream.SkipRead(len);
len += 1;
break;
case TokenLength.TwoByteLen:
len = stream.ReadShort();
stream.SkipRead(len);
len += 2;
break;
case TokenLength.FourByteLen:
len = stream.ReadInt();
stream.SkipRead(len);
len += 4;
break;
case TokenLength.OneByte:
len = 1;
stream.SkipRead(len);
break;
case TokenLength.FourBytes:
len = 4;
stream.SkipRead(len);
break;
case TokenLength.EigthBytes:
len = 8;
stream.SkipRead(len);
break;
case TokenLength.Dependent:
default:
_logger?.LogError($"Unknown length of token of type {tokenDesc.TokenType}");
throw new Exception($"Unknown length of token of type {tokenDesc.TokenType}");
}
_logger?.LogWarning($"Not implemented token {tokenDesc.TokenType} of len {len}");
return(new UnknownToken(tokenDesc.TokenType, len));
}
private TdsToken CreateControl(TokenDescriptor tokenDesc, TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
int len = stream.ReadShort();
int read = 0;
var formats = new List <string>();
while (read < len)
{
int formatLen = stream.Read();
var format = stream.ReadString(formatLen);
read += 1 + formatLen;
formats.Add(format);
}
return(new ControlToken(tokenDesc.TokenType)
{
Formats = formats
});
}
private static object GetDatetimeValue(TdsResponseStream stream, TdsType type)
{
int len;
int dayTicks;
int timeTicks;
int minutes;
if (type == TdsType.TDS_DATETIMEN)
{
len = stream.Read();
}
else if (type == TdsType.TDS_SHORTDATE)
{
len = 4;
}
else
{
len = 8;
}
switch (len)
{
case 8:
dayTicks = stream.ReadInt();
timeTicks = stream.ReadInt();
return(new System.Data.SqlTypes.SqlDateTime(dayTicks, timeTicks).Value);
case 4:
dayTicks = stream.ReadShort();
minutes = stream.ReadShort();
return(new DateTime(1900, 1, 1).AddDays(dayTicks).AddMinutes(minutes));
default:
case 0:
return(null);
}
}
private TdsToken CreateCapabiltiy(TokenDescriptor tokenDesc, TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
int len = stream.ReadShort();
if (stream.Read() != 1)
{
throw new Exception("TDS_CAPABILITY: expected request string");
}
int capReqLen = stream.Read();
if (capReqLen != 11 && capReqLen != 0)
{
throw new Exception("TDS_CAPABILITY: byte count not 11");
}
byte[] capRequest = new byte[11];
if (capReqLen != 0)
{
stream.Read(capRequest, 0, 11);
}
if (stream.Read() != 2)
{
throw new Exception("TDS_CAPABILITY: expected response string");
}
int capResLen = stream.Read();
if (capResLen != 10 && capResLen != 0)
{
throw new Exception("TDS_CAPABILITY: byte count not 10");
}
byte[] capResponse = new byte[10];
if (capResLen != 0)
{
stream.Read(capResponse, 0, 10);
}
return(new CapabiltiyToken(tokenDesc.TokenType, capRequest, capResponse));
}
private TdsToken CreateTextMessage(TokenDescriptor tokenDesc, TdsResponseStream stream, Encoding encoder, FormatToken lastFormat)
{
int len = stream.ReadShort();
int msgNumber = stream.ReadInt();
int state = stream.Read();
int severity = stream.Read();
int sqlStatusLen = stream.Read();
var sqlStatus = stream.ReadBytes(sqlStatusLen);
int status = stream.Read();
int tranState = stream.ReadShort(); // discarded
int msgLen = stream.ReadShort();
var msg = stream.ReadString(msgLen);
int srvNameLen = stream.Read();
var serverName = stream.ReadString(srvNameLen);
int procNameLen = stream.Read();
var procName = stream.ReadString(procNameLen);
int lineNumber = stream.ReadShort();
return(new TextMessageToken(tokenDesc.TokenType)
{
MessageNumber = msgNumber,
State = state,
Severity = severity,
ParamsFollows = status == 1,
Message = msg,
ServerName = serverName,
ProcName = procName,
LineNumber = lineNumber,
});
}
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,
});
}
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);
}