private bool TryCommonProcessMetaData(TdsParserStateObject stateObj, _SqlMetaData col)
{
byte byteLen;
UInt32 userType;
// read user type - 4 bytes Yukon, 2 backwards
if (!stateObj.TryReadUInt32(out userType))
{
return false;
}
// read flags and set appropriate flags in structure
byte flags;
if (!stateObj.TryReadByte(out flags))
{
return false;
}
col.updatability = (byte)((flags & TdsEnums.Updatability) >> 2);
col.isNullable = (TdsEnums.Nullable == (flags & TdsEnums.Nullable));
col.isIdentity = (TdsEnums.Identity == (flags & TdsEnums.Identity));
// read second byte of column metadata flags
if (!stateObj.TryReadByte(out flags))
{
return false;
}
byte tdsType;
if (!stateObj.TryReadByte(out tdsType))
{
return false;
}
if (tdsType == TdsEnums.SQLXMLTYPE)
col.length = TdsEnums.SQL_USHORTVARMAXLEN; //Use the same length as other plp datatypes
else if (IsVarTimeTds(tdsType))
col.length = 0; // placeholder until we read the scale, just make sure it's not SQL_USHORTVARMAXLEN
else if (tdsType == TdsEnums.SQLDATE)
{
col.length = 3;
}
else
{
if (!TryGetTokenLength(tdsType, stateObj, out col.length))
{
return false;
}
}
col.metaType = MetaType.GetSqlDataType(tdsType, userType, col.length);
col.type = col.metaType.SqlDbType;
col.tdsType = (col.isNullable ? col.metaType.NullableType : col.metaType.TDSType);
{
if (TdsEnums.SQLUDT == tdsType)
{
throw SQL.UnsupportedFeatureAndToken(_connHandler, SqlDbType.Udt.ToString());
}
if (col.length == TdsEnums.SQL_USHORTVARMAXLEN)
{
Debug.Assert(tdsType == TdsEnums.SQLXMLTYPE ||
tdsType == TdsEnums.SQLBIGVARCHAR ||
tdsType == TdsEnums.SQLBIGVARBINARY ||
tdsType == TdsEnums.SQLNVARCHAR ||
tdsType == TdsEnums.SQLUDT,
"Invalid streaming datatype");
col.metaType = MetaType.GetMaxMetaTypeFromMetaType(col.metaType);
Debug.Assert(col.metaType.IsLong, "Max datatype not IsLong");
col.length = Int32.MaxValue;
if (tdsType == TdsEnums.SQLXMLTYPE)
{
byte schemapresent;
if (!stateObj.TryReadByte(out schemapresent))
{
return false;
}
if ((schemapresent & 1) != 0)
{
if (!stateObj.TryReadByte(out byteLen))
{
return false;
}
if (byteLen != 0)
{
if (!stateObj.TryReadString(byteLen, out col.xmlSchemaCollectionDatabase))
{
return false;
}
}
if (!stateObj.TryReadByte(out byteLen))
{
return false;
}
if (byteLen != 0)
{
if (!stateObj.TryReadString(byteLen, out col.xmlSchemaCollectionOwningSchema))
{
return false;
}
}
short shortLen;
if (!stateObj.TryReadInt16(out shortLen))
{
return false;
}
if (byteLen != 0)
{
if (!stateObj.TryReadString(shortLen, out col.xmlSchemaCollectionName))
{
return false;
}
}
}
}
}
}
if (col.type == SqlDbType.Decimal)
{
if (!stateObj.TryReadByte(out col.precision))
{
return false;
}
if (!stateObj.TryReadByte(out col.scale))
{
return false;
}
}
if (col.metaType.IsVarTime)
{
if (!stateObj.TryReadByte(out col.scale))
{
return false;
}
Debug.Assert(0 <= col.scale && col.scale <= 7);
// calculate actual column length here
switch (col.metaType.SqlDbType)
{
case SqlDbType.Time:
col.length = MetaType.GetTimeSizeFromScale(col.scale);
break;
case SqlDbType.DateTime2:
// Date in number of days (3 bytes) + time
col.length = 3 + MetaType.GetTimeSizeFromScale(col.scale);
break;
case SqlDbType.DateTimeOffset:
// Date in days (3 bytes) + offset in minutes (2 bytes) + time
col.length = 5 + MetaType.GetTimeSizeFromScale(col.scale);
break;
default:
Debug.Assert(false, "Unknown VariableTime type!");
break;
}
}
// read the collation for 7.x servers
if (col.metaType.IsCharType && (tdsType != TdsEnums.SQLXMLTYPE))
{
if (!TryProcessCollation(stateObj, out col.collation))
{
return false;
}
int codePage = GetCodePage(col.collation, stateObj);
if (codePage == _defaultCodePage)
{
col.codePage = _defaultCodePage;
col.encoding = _defaultEncoding;
}
else
{
col.codePage = codePage;
col.encoding = System.Text.Encoding.GetEncoding(col.codePage);
}
}
if (col.metaType.IsLong && !col.metaType.IsPlp)
{
int unusedLen = 0xFFFF; //We ignore this value
if (!TryProcessOneTable(stateObj, ref unusedLen, out col.multiPartTableName))
{
return false;
}
}
if (!stateObj.TryReadByte(out byteLen))
{
return false;
}
if (!stateObj.TryReadString(byteLen, out col.column))
{
return false;
}
// We get too many DONE COUNTs from the server, causing too meany StatementCompleted event firings.
// We only need to fire this event when we actually have a meta data stream with 0 or more rows.
stateObj._receivedColMetaData = true;
return true;
}
internal bool TryReadSqlValueInternal(SqlBuffer value, byte tdsType, int length, TdsParserStateObject stateObj)
{
switch (tdsType)
{
case TdsEnums.SQLBIT:
case TdsEnums.SQLBITN:
Debug.Assert(length == 1, "invalid length for SqlBoolean type!");
byte byteValue;
if (!stateObj.TryReadByte(out byteValue))
{
return false;
}
value.Boolean = (byteValue != 0);
break;
case TdsEnums.SQLINTN:
if (length == 1)
{
goto case TdsEnums.SQLINT1;
}
else if (length == 2)
{
goto case TdsEnums.SQLINT2;
}
else if (length == 4)
{
goto case TdsEnums.SQLINT4;
}
else
{
goto case TdsEnums.SQLINT8;
}
case TdsEnums.SQLINT1:
Debug.Assert(length == 1, "invalid length for SqlByte type!");
if (!stateObj.TryReadByte(out byteValue))
{
return false;
}
value.Byte = byteValue;
break;
case TdsEnums.SQLINT2:
Debug.Assert(length == 2, "invalid length for SqlInt16 type!");
short shortValue;
if (!stateObj.TryReadInt16(out shortValue))
{
return false;
}
value.Int16 = shortValue;
break;
case TdsEnums.SQLINT4:
Debug.Assert(length == 4, "invalid length for SqlInt32 type!");
int intValue;
if (!stateObj.TryReadInt32(out intValue))
{
return false;
}
value.Int32 = intValue;
break;
case TdsEnums.SQLINT8:
Debug.Assert(length == 8, "invalid length for SqlInt64 type!");
long longValue;
if (!stateObj.TryReadInt64(out longValue))
{
return false;
}
value.Int64 = longValue;
break;
case TdsEnums.SQLFLTN:
if (length == 4)
{
goto case TdsEnums.SQLFLT4;
}
else
{
goto case TdsEnums.SQLFLT8;
}
case TdsEnums.SQLFLT4:
Debug.Assert(length == 4, "invalid length for SqlSingle type!");
float singleValue;
if (!stateObj.TryReadSingle(out singleValue))
{
return false;
}
value.Single = singleValue;
break;
case TdsEnums.SQLFLT8:
Debug.Assert(length == 8, "invalid length for SqlDouble type!");
double doubleValue;
if (!stateObj.TryReadDouble(out doubleValue))
{
return false;
}
value.Double = doubleValue;
break;
case TdsEnums.SQLMONEYN:
if (length == 4)
{
goto case TdsEnums.SQLMONEY4;
}
else
{
goto case TdsEnums.SQLMONEY;
}
case TdsEnums.SQLMONEY:
{
int mid;
uint lo;
if (!stateObj.TryReadInt32(out mid))
{
return false;
}
if (!stateObj.TryReadUInt32(out lo))
{
return false;
}
long l = (((long)mid) << 0x20) + ((long)lo);
value.SetToMoney(l);
break;
}
case TdsEnums.SQLMONEY4:
if (!stateObj.TryReadInt32(out intValue))
{
return false;
}
value.SetToMoney(intValue);
break;
case TdsEnums.SQLDATETIMN:
if (length == 4)
{
goto case TdsEnums.SQLDATETIM4;
}
else
{
goto case TdsEnums.SQLDATETIME;
}
case TdsEnums.SQLDATETIM4:
ushort daypartShort, timepartShort;
if (!stateObj.TryReadUInt16(out daypartShort))
{
return false;
}
if (!stateObj.TryReadUInt16(out timepartShort))
{
return false;
}
value.SetToDateTime(daypartShort, timepartShort * SqlDateTime.SQLTicksPerMinute);
break;
case TdsEnums.SQLDATETIME:
int daypart;
uint timepart;
if (!stateObj.TryReadInt32(out daypart))
{
return false;
}
if (!stateObj.TryReadUInt32(out timepart))
{
return false;
}
value.SetToDateTime(daypart, (int)timepart);
break;
case TdsEnums.SQLUNIQUEID:
{
Debug.Assert(length == 16, "invalid length for SqlGuid type!");
byte[] b = new byte[length];
if (!stateObj.TryReadByteArray(b, 0, length))
{
return false;
}
value.SqlGuid = new SqlGuid(b, true); // doesn't copy the byte array
break;
}
case TdsEnums.SQLBINARY:
case TdsEnums.SQLBIGBINARY:
case TdsEnums.SQLBIGVARBINARY:
case TdsEnums.SQLVARBINARY:
case TdsEnums.SQLIMAGE:
{
// Note: Better not come here with plp data!!
Debug.Assert(length <= TdsEnums.MAXSIZE);
byte[] b = new byte[length];
if (!stateObj.TryReadByteArray(b, 0, length))
{
return false;
}
value.SqlBinary = new SqlBinary(b, true); // doesn't copy the byte array
break;
}
case TdsEnums.SQLVARIANT:
if (!TryReadSqlVariant(value, length, stateObj))
{
return false;
}
break;
default:
Debug.Assert(false, "Unknown SqlType!" + tdsType.ToString(CultureInfo.InvariantCulture));
break;
} // switch
return true;
}
internal bool TryProcessReturnValue(int length, TdsParserStateObject stateObj, out SqlReturnValue returnValue)
{
returnValue = null;
SqlReturnValue rec = new SqlReturnValue();
rec.length = length; // In Yukon this length is -1
ushort parameterIndex;
if (!stateObj.TryReadUInt16(out parameterIndex))
{
return false;
}
byte len;
if (!stateObj.TryReadByte(out len))
{ // Length of parameter name
return false;
}
if (len > 0)
{
if (!stateObj.TryReadString(len, out rec.parameter))
{
return false;
}
}
// read status and ignore
byte ignored;
if (!stateObj.TryReadByte(out ignored))
{
return false;
}
UInt32 userType;
// read user type - 4 bytes Yukon, 2 backwards
if (!stateObj.TryReadUInt32(out userType))
{
return false;
}
// read off the flags
ushort ignoredFlags;
if (!stateObj.TryReadUInt16(out ignoredFlags))
{
return false;
}
// read the type
byte tdsType;
if (!stateObj.TryReadByte(out tdsType))
{
return false;
}
// read the MaxLen
// For xml datatpyes, there is no tokenLength
int tdsLen;
if (tdsType == TdsEnums.SQLXMLTYPE)
{
tdsLen = TdsEnums.SQL_USHORTVARMAXLEN;
}
else if (IsVarTimeTds(tdsType))
tdsLen = 0; // placeholder until we read the scale, just make sure it's not SQL_USHORTVARMAXLEN
else if (tdsType == TdsEnums.SQLDATE)
{
tdsLen = 3;
}
else
{
if (!TryGetTokenLength(tdsType, stateObj, out tdsLen))
{
return false;
}
}
rec.metaType = MetaType.GetSqlDataType(tdsType, userType, tdsLen);
rec.type = rec.metaType.SqlDbType;
// always use the nullable type for parameters if Shiloh or later
// Sphinx sometimes sends fixed length return values
rec.tdsType = rec.metaType.NullableType;
rec.isNullable = true;
if (tdsLen == TdsEnums.SQL_USHORTVARMAXLEN)
{
rec.metaType = MetaType.GetMaxMetaTypeFromMetaType(rec.metaType);
}
if (rec.type == SqlDbType.Decimal)
{
if (!stateObj.TryReadByte(out rec.precision))
{
return false;
}
if (!stateObj.TryReadByte(out rec.scale))
{
return false;
}
}
if (rec.metaType.IsVarTime)
{
if (!stateObj.TryReadByte(out rec.scale))
{
return false;
}
}
if (tdsType == TdsEnums.SQLUDT)
{
throw SQL.UnsupportedFeatureAndToken(_connHandler, SqlDbType.Udt.ToString());
}
if (rec.type == SqlDbType.Xml)
{
// Read schema info
byte schemapresent;
if (!stateObj.TryReadByte(out schemapresent))
{
return false;
}
if ((schemapresent & 1) != 0)
{
if (!stateObj.TryReadByte(out len))
{
return false;
}
if (len != 0)
{
if (!stateObj.TryReadString(len, out rec.xmlSchemaCollectionDatabase))
{
return false;
}
}
if (!stateObj.TryReadByte(out len))
{
return false;
}
if (len != 0)
{
if (!stateObj.TryReadString(len, out rec.xmlSchemaCollectionOwningSchema))
{
return false;
}
}
short slen;
if (!stateObj.TryReadInt16(out slen))
{
return false;
}
if (slen != 0)
{
if (!stateObj.TryReadString(slen, out rec.xmlSchemaCollectionName))
{
return false;
}
}
}
}
else if (rec.metaType.IsCharType)
{
// read the collation for 8.x servers
if (!TryProcessCollation(stateObj, out rec.collation))
{
return false;
}
int codePage = GetCodePage(rec.collation, stateObj);
// if the column lcid is the same as the default, use the default encoder
if (codePage == _defaultCodePage)
{
rec.codePage = _defaultCodePage;
rec.encoding = _defaultEncoding;
}
else
{
rec.codePage = codePage;
rec.encoding = System.Text.Encoding.GetEncoding(rec.codePage);
}
}
// for now we coerce return values into a SQLVariant, not good...
bool isNull = false;
ulong valLen;
if (!TryProcessColumnHeaderNoNBC(rec, stateObj, out isNull, out valLen))
{
return false;
}
// always read as sql types
Debug.Assert(valLen < (ulong)(Int32.MaxValue), "ProcessReturnValue received data size > 2Gb");
int intlen = valLen > (ulong)(Int32.MaxValue) ? Int32.MaxValue : (int)valLen;
if (rec.metaType.IsPlp)
{
intlen = Int32.MaxValue; // If plp data, read it all
}
if (isNull)
{
GetNullSqlValue(rec.value, rec);
}
else
{
if (!TryReadSqlValue(rec.value, rec, intlen, stateObj))
{
return false;
}
}
returnValue = rec;
return true;
}
private bool TryProcessTypeInfo (TdsParserStateObject stateObj, SqlMetaDataPriv col, UInt32 userType) {
byte byteLen;
byte tdsType;
if (!stateObj.TryReadByte(out tdsType)) {
return false;
}
if (tdsType == TdsEnums.SQLXMLTYPE)
col.length = TdsEnums.SQL_USHORTVARMAXLEN; //Use the same length as other plp datatypes
else if (IsVarTimeTds(tdsType))
col.length = 0; // placeholder until we read the scale, just make sure it's not SQL_USHORTVARMAXLEN
else if (tdsType == TdsEnums.SQLDATE) {
col.length = 3;
}
else {
if (!TryGetTokenLength(tdsType, stateObj, out col.length)) {
return false;
}
}
col.metaType = MetaType.GetSqlDataType(tdsType, userType, col.length);
col.type = col.metaType.SqlDbType;
// If sphinx, do not change to nullable type
if (_isShiloh)
col.tdsType = (col.isNullable ? col.metaType.NullableType : col.metaType.TDSType);
else
col.tdsType = tdsType;
if (_isYukon) {
if (TdsEnums.SQLUDT == tdsType) {
if (!TryProcessUDTMetaData((SqlMetaDataPriv) col, stateObj)) {
return false;
}
}
if (col.length == TdsEnums.SQL_USHORTVARMAXLEN) {
Debug.Assert(tdsType == TdsEnums.SQLXMLTYPE ||
tdsType == TdsEnums.SQLBIGVARCHAR ||
tdsType == TdsEnums.SQLBIGVARBINARY ||
tdsType == TdsEnums.SQLNVARCHAR ||
tdsType == TdsEnums.SQLUDT,
"Invalid streaming datatype");
col.metaType = MetaType.GetMaxMetaTypeFromMetaType(col.metaType);
Debug.Assert(col.metaType.IsLong, "Max datatype not IsLong");
col.length = Int32.MaxValue;
if (tdsType == TdsEnums.SQLXMLTYPE) {
byte schemapresent;
if (!stateObj.TryReadByte(out schemapresent)) {
return false;
}
if ((schemapresent & 1) != 0) {
if (!stateObj.TryReadByte(out byteLen)) {
return false;
}
if (byteLen != 0) {
if (!stateObj.TryReadString(byteLen, out col.xmlSchemaCollectionDatabase)) {
return false;
}
}
if (!stateObj.TryReadByte(out byteLen)) {
return false;
}
if (byteLen != 0) {
if (!stateObj.TryReadString(byteLen, out col.xmlSchemaCollectionOwningSchema)) {
return false;
}
}
short shortLen;
if (!stateObj.TryReadInt16(out shortLen)) {
return false;
}
if (byteLen != 0) {
if (!stateObj.TryReadString(shortLen, out col.xmlSchemaCollectionName)) {
return false;
}
}
}
}
}
}
if (col.type == SqlDbType.Decimal) {
if (!stateObj.TryReadByte(out col.precision)) {
return false;
}
if (!stateObj.TryReadByte(out col.scale)) {
return false;
}
}
if (col.metaType.IsVarTime) {
if (!stateObj.TryReadByte(out col.scale)) {
return false;
}
Debug.Assert(0 <= col.scale && col.scale <= 7);
// calculate actual column length here
//
switch (col.metaType.SqlDbType)
{
case SqlDbType.Time:
col.length = MetaType.GetTimeSizeFromScale(col.scale);
break;
case SqlDbType.DateTime2:
// Date in number of days (3 bytes) + time
col.length = 3 + MetaType.GetTimeSizeFromScale(col.scale);
break;
case SqlDbType.DateTimeOffset:
// Date in days (3 bytes) + offset in minutes (2 bytes) + time
col.length = 5 + MetaType.GetTimeSizeFromScale(col.scale);
break;
default:
Debug.Assert(false, "Unknown VariableTime type!");
break;
}
}
// read the collation for 7.x servers
if (_isShiloh && col.metaType.IsCharType && (tdsType != TdsEnums.SQLXMLTYPE)) {
if (!TryProcessCollation(stateObj, out col.collation)) {
return false;
}
int codePage = GetCodePage(col.collation, stateObj);
if (codePage == _defaultCodePage) {
col.codePage = _defaultCodePage;
col.encoding = _defaultEncoding;
}
else {
col.codePage = codePage;
col.encoding = System.Text.Encoding.GetEncoding(col.codePage);
}
}
return true;
}
/// <summary>
/// <para> Parses the TDS message to read a single CIPHER_INFO table.</para>
/// </summary>
internal bool TryProcessCipherInfoTable (TdsParserStateObject stateObj, out SqlTceCipherInfoTable? cipherTable) {
// Read count
short tableSize = 0;
cipherTable = null;
if (!stateObj.TryReadInt16(out tableSize)) {
return false;
}
if (0 != tableSize) {
SqlTceCipherInfoTable tempTable = new SqlTceCipherInfoTable(tableSize);
// Read individual entries
for (int i = 0; i < tableSize; i++) {
SqlTceCipherInfoEntry entry;
if (!TryReadCipherInfoEntry (stateObj, out entry)) {
return false;
}
tempTable[i] = entry;
}
cipherTable = tempTable;
}
return true;
}
internal bool TryProcessReturnValue(int length,
TdsParserStateObject stateObj,
out SqlReturnValue returnValue,
SqlCommandColumnEncryptionSetting columnEncryptionSetting) {
returnValue = null;
SqlReturnValue rec = new SqlReturnValue();
rec.length = length; // In Yukon this length is -1
if (_isYukon) {
if (!stateObj.TryReadUInt16(out rec.parmIndex)) {
return false;
}
}
byte len;
if (!stateObj.TryReadByte(out len)) { // Length of parameter name
return false;
}
rec.parameter = null;
if (len > 0) {
if (!stateObj.TryReadString(len, out rec.parameter)) {
return false;
}
}
// read status and ignore
byte ignored;
if (!stateObj.TryReadByte(out ignored)) {
return false;
}
UInt32 userType;
// read user type - 4 bytes Yukon, 2 backwards
if (IsYukonOrNewer) {
if (!stateObj.TryReadUInt32(out userType)) {
return false;
}
}
else {
ushort userTypeShort;
if (!stateObj.TryReadUInt16(out userTypeShort)) {
return false;
}
userType = userTypeShort;
}
// Read off the flags.
// The first byte is ignored since it doesn't contain any interesting information.
byte flags;
if (!stateObj.TryReadByte(out flags)) {
return false;
}
if (!stateObj.TryReadByte(out flags)) {
return false;
}
// Check if the column is encrypted.
if (_serverSupportsColumnEncryption) {
rec.isEncrypted = (TdsEnums.IsEncrypted == (flags & TdsEnums.IsEncrypted));
}
// read the type
byte tdsType;
if (!stateObj.TryReadByte(out tdsType)) {
return false;
}
// read the MaxLen
// For xml datatpyes, there is no tokenLength
int tdsLen;
if (tdsType == TdsEnums.SQLXMLTYPE) {
tdsLen = TdsEnums.SQL_USHORTVARMAXLEN;
}
else if (IsVarTimeTds(tdsType))
tdsLen = 0; // placeholder until we read the scale, just make sure it's not SQL_USHORTVARMAXLEN
else if (tdsType == TdsEnums.SQLDATE) {
tdsLen = 3;
}
else {
if (!TryGetTokenLength(tdsType, stateObj, out tdsLen)) {
return false;
}
}
rec.metaType = MetaType.GetSqlDataType(tdsType, userType, tdsLen);
rec.type = rec.metaType.SqlDbType;
// always use the nullable type for parameters if Shiloh or later
// Sphinx sometimes sends fixed length return values
if (_isShiloh) {
rec.tdsType = rec.metaType.NullableType;
rec.isNullable = true;
if (tdsLen == TdsEnums.SQL_USHORTVARMAXLEN) {
Debug.Assert(_isYukon, "plp data from pre-Yukon server");
rec.metaType = MetaType.GetMaxMetaTypeFromMetaType(rec.metaType);
}
}
else { // For sphinx, keep the fixed type if that is what is returned
if (rec.metaType.NullableType == tdsType)
rec.isNullable = true;
rec.tdsType = (byte)tdsType;
}
if (rec.type == SqlDbType.Decimal) {
if (!stateObj.TryReadByte(out rec.precision)) {
return false;
}
if (!stateObj.TryReadByte(out rec.scale)) {
return false;
}
}
if (rec.metaType.IsVarTime) {
if (!stateObj.TryReadByte(out rec.scale)) {
return false;
}
}
if (tdsType == TdsEnums.SQLUDT) {
if (!TryProcessUDTMetaData((SqlMetaDataPriv) rec, stateObj)) {
return false;
}
}
if (rec.type == SqlDbType.Xml) {
// Read schema info
byte schemapresent;
if (!stateObj.TryReadByte(out schemapresent)) {
return false;
}
if ((schemapresent & 1) != 0) {
if (!stateObj.TryReadByte(out len)) {
return false;
}
if (len != 0) {
if (!stateObj.TryReadString(len, out rec.xmlSchemaCollectionDatabase)) {
return false;
}
}
if (!stateObj.TryReadByte(out len)) {
return false;
}
if (len != 0) {
if (!stateObj.TryReadString(len, out rec.xmlSchemaCollectionOwningSchema)) {
return false;
}
}
short slen;
if (!stateObj.TryReadInt16(out slen)) {
return false;
}
if (slen != 0) {
if (!stateObj.TryReadString(slen, out rec.xmlSchemaCollectionName)) {
return false;
}
}
}
}
else if (_isShiloh && rec.metaType.IsCharType) {
// read the collation for 8.x servers
if (!TryProcessCollation(stateObj, out rec.collation)) {
return false;
}
int codePage = GetCodePage(rec.collation, stateObj);
// if the column lcid is the same as the default, use the default encoder
if (codePage == _defaultCodePage) {
rec.codePage = _defaultCodePage;
rec.encoding = _defaultEncoding;
}
else {
rec.codePage = codePage;
rec.encoding = System.Text.Encoding.GetEncoding(rec.codePage);
}
}
// For encrypted parameters, read the unencrypted type and encryption information.
if (_serverSupportsColumnEncryption && rec.isEncrypted) {
if (!TryProcessTceCryptoMetadata(stateObj, rec, cipherTable: null, columnEncryptionSetting: columnEncryptionSetting, isReturnValue: true)) {
return false;
}
}
// for now we coerce return values into a SQLVariant, not good...
bool isNull = false;
ulong valLen;
if (!TryProcessColumnHeaderNoNBC(rec, stateObj, out isNull, out valLen)) {
return false;
}
// always read as sql types
Debug.Assert(valLen < (ulong)(Int32.MaxValue), "ProcessReturnValue received data size > 2Gb");
int intlen = valLen > (ulong)(Int32.MaxValue) ? Int32.MaxValue : (int)valLen;
if (rec.metaType.IsPlp) {
intlen = Int32.MaxValue; // If plp data, read it all
}
if (isNull) {
GetNullSqlValue(rec.value, rec, SqlCommandColumnEncryptionSetting.Disabled, _connHandler);
}
else {
// We should never do any decryption here, so pass disabled as the command encryption override.
// We only read the binary value and decryption will be performed by OnReturnValue().
if (!TryReadSqlValue(rec.value, rec, intlen, stateObj, SqlCommandColumnEncryptionSetting.Disabled, columnName:null /*Not used*/)) {
return false;
}
}
returnValue = rec;
return true;
}
private bool TryCommonProcessMetaData(TdsParserStateObject stateObj, _SqlMetaData col) {
byte byteLen;
UInt32 userType;
// read user type - 4 bytes Yukon, 2 backwards
if (IsYukonOrNewer) {
if (!stateObj.TryReadUInt32(out userType)) {
return false;
}
}
else {
ushort userTypeShort;
if (!stateObj.TryReadUInt16(out userTypeShort)) {
return false;
}
userType = userTypeShort;
}
// read flags and set appropriate flags in structure
byte flags;
if (!stateObj.TryReadByte(out flags)) {
return false;
}
col.updatability = (byte)((flags & TdsEnums.Updatability) >> 2);
col.isNullable = (TdsEnums.Nullable == (flags & TdsEnums.Nullable));
col.isIdentity = (TdsEnums.Identity == (flags & TdsEnums.Identity));
// read second byte of column metadata flags
if (!stateObj.TryReadByte(out flags)) {
return false;
}
col.isColumnSet = (TdsEnums.IsColumnSet == (flags & TdsEnums.IsColumnSet));
byte tdsType;
if (!stateObj.TryReadByte(out tdsType)) {
return false;
}
if (tdsType == TdsEnums.SQLXMLTYPE)
col.length = TdsEnums.SQL_USHORTVARMAXLEN; //Use the same length as other plp datatypes
else if (IsVarTimeTds(tdsType))
col.length = 0; // placeholder until we read the scale, just make sure it's not SQL_USHORTVARMAXLEN
else if (tdsType == TdsEnums.SQLDATE) {
col.length = 3;
}
else {
if (!TryGetTokenLength(tdsType, stateObj, out col.length)) {
return false;
}
}
col.metaType = MetaType.GetSqlDataType(tdsType, userType, col.length);
col.type = col.metaType.SqlDbType;
// If sphinx, do not change to nullable type
if (_isShiloh)
col.tdsType = (col.isNullable ? col.metaType.NullableType : col.metaType.TDSType);
else
col.tdsType = tdsType;
if (_isYukon) {
if (TdsEnums.SQLUDT == tdsType) {
if (!TryProcessUDTMetaData((SqlMetaDataPriv) col, stateObj)) {
return false;
}
}
if (col.length == TdsEnums.SQL_USHORTVARMAXLEN) {
Debug.Assert(tdsType == TdsEnums.SQLXMLTYPE ||
tdsType == TdsEnums.SQLBIGVARCHAR ||
tdsType == TdsEnums.SQLBIGVARBINARY ||
tdsType == TdsEnums.SQLNVARCHAR ||
tdsType == TdsEnums.SQLUDT,
"Invalid streaming datatype");
col.metaType = MetaType.GetMaxMetaTypeFromMetaType(col.metaType);
Debug.Assert(col.metaType.IsLong, "Max datatype not IsLong");
col.length = Int32.MaxValue;
if (tdsType == TdsEnums.SQLXMLTYPE) {
byte schemapresent;
if (!stateObj.TryReadByte(out schemapresent)) {
return false;
}
if ((schemapresent & 1) != 0) {
if (!stateObj.TryReadByte(out byteLen)) {
return false;
}
if (byteLen != 0) {
if (!stateObj.TryReadString(byteLen, out col.xmlSchemaCollectionDatabase)) {
return false;
}
}
if (!stateObj.TryReadByte(out byteLen)) {
return false;
}
if (byteLen != 0) {
if (!stateObj.TryReadString(byteLen, out col.xmlSchemaCollectionOwningSchema)) {
return false;
}
}
short shortLen;
if (!stateObj.TryReadInt16(out shortLen)) {
return false;
}
if (byteLen != 0) {
if (!stateObj.TryReadString(shortLen, out col.xmlSchemaCollectionName)) {
return false;
}
}
}
}
}
}
if (col.type == SqlDbType.Decimal) {
if (!stateObj.TryReadByte(out col.precision)) {
return false;
}
if (!stateObj.TryReadByte(out col.scale)) {
return false;
}
}
if (col.metaType.IsVarTime) {
if (!stateObj.TryReadByte(out col.scale)) {
return false;
}
Debug.Assert(0 <= col.scale && col.scale <= 7);
// calculate actual column length here
//
switch (col.metaType.SqlDbType)
{
case SqlDbType.Time:
col.length = MetaType.GetTimeSizeFromScale(col.scale);
break;
case SqlDbType.DateTime2:
// Date in number of days (3 bytes) + time
col.length = 3 + MetaType.GetTimeSizeFromScale(col.scale);
break;
case SqlDbType.DateTimeOffset:
// Date in days (3 bytes) + offset in minutes (2 bytes) + time
col.length = 5 + MetaType.GetTimeSizeFromScale(col.scale);
break;
default:
Debug.Assert(false, "Unknown VariableTime type!");
break;
}
}
// read the collation for 7.x servers
if (_isShiloh && col.metaType.IsCharType && (tdsType != TdsEnums.SQLXMLTYPE)) {
if (!TryProcessCollation(stateObj, out col.collation)) {
return false;
}
int codePage = GetCodePage(col.collation, stateObj);
if (codePage == _defaultCodePage) {
col.codePage = _defaultCodePage;
col.encoding = _defaultEncoding;
}
else {
col.codePage = codePage;
col.encoding = System.Text.Encoding.GetEncoding(col.codePage);
}
}
if (col.metaType.IsLong && !col.metaType.IsPlp) {
if (_isYukon) {
int unusedLen = 0xFFFF; //We ignore this value
if (!TryProcessOneTable(stateObj, ref unusedLen, out col.multiPartTableName)) {
return false;
}
} else {
ushort shortLen;
if (!stateObj.TryReadUInt16(out shortLen)) {
return false;
}
string tableName;
if (!stateObj.TryReadString(shortLen, out tableName)) {
return false;
}
// with Sql2000 this is returned as an unquoted mix of catalog.owner.table
// all of which may contain "." and unable to parse correctly from the string alone
// example "select * from pubs..[A.B.C.D.E]" AND only when * will contain a image/text/ntext column
// by delay parsing from execute to SqlDataReader.GetSchemaTable to enable more scenarios
col.multiPartTableName = new MultiPartTableName(tableName);
}
}
if (!stateObj.TryReadByte(out byteLen)) {
return false;
}
if (!stateObj.TryReadString(byteLen, out col.column)) {
return false;
}
// We get too many DONE COUNTs from the server, causing too meany StatementCompleted event firings.
// We only need to fire this event when we actually have a meta data stream with 0 or more rows.
stateObj._receivedColMetaData = true;
return true;
}