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Change TryReadString to use TryReadBytesWithContinue #3422

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Merged
merged 4 commits into from
Jun 24, 2025
Merged

Change TryReadString to use TryReadBytesWithContinue #3422

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6e1ff62
change TryReadString to use TryReadBytesWithContinue
Wraith2 Jun 15, 2025
7325828
review feedback
Wraith2 Jun 16, 2025
6f66457
tidy up sql
Wraith2 Jun 21, 2025
a8862a9
Update src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/DataReaderT…
cheenamalhotra Jun 23, 2025
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44 changes: 1 addition & 43 deletions src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6374,7 +6374,7 @@ internal TdsOperationStatus TryReadSqlValue(SqlBuffer value,
}
else
{
result = TryReadByteArrayWithContinue(stateObj, length, out b);
result = stateObj.TryReadByteArrayWithContinue(length, out b);
if (result != TdsOperationStatus.Done)
{
return result;
Expand Down Expand Up @@ -6495,48 +6495,6 @@ internal TdsOperationStatus TryReadSqlValue(SqlBuffer value,
return TdsOperationStatus.Done;
}

private TdsOperationStatus TryReadByteArrayWithContinue(TdsParserStateObject stateObj, int length, out byte[] bytes)
{
bytes = null;
int offset = 0;
byte[] temp = null;
(bool canContinue, bool isStarting, bool isContinuing) = stateObj.GetSnapshotStatuses();
if (canContinue)
{
if (isContinuing || isStarting)
{
temp = stateObj.TryTakeSnapshotStorage() as byte[];
Debug.Assert(bytes == null || bytes.Length == length, "stored buffer length must be null or must have been created with the correct length");
}
if (temp != null)
{
offset = stateObj.GetSnapshotTotalSize();
}
}


if (temp == null)
{
temp = new byte[length];
}

TdsOperationStatus result = stateObj.TryReadByteArray(temp, length, out _, offset, isStarting || isContinuing);

if (result == TdsOperationStatus.Done)
{
bytes = temp;
}
else if (result == TdsOperationStatus.NeedMoreData)
{
if (isStarting || isContinuing)
{
stateObj.SetSnapshotStorage(temp);
}
}

return result;
}

private TdsOperationStatus TryReadSqlDateTime(SqlBuffer value, byte tdsType, int length, byte scale, TdsParserStateObject stateObj)
{
Span<byte> datetimeBuffer = ((uint)length <= 16) ? stackalloc byte[16] : new byte[length];
Expand Down
44 changes: 1 addition & 43 deletions src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6570,7 +6570,7 @@ internal TdsOperationStatus TryReadSqlValue(SqlBuffer value,
}
else
{
result = TryReadByteArrayWithContinue(stateObj, length, out b);
result = stateObj.TryReadByteArrayWithContinue(length, out b);
if (result != TdsOperationStatus.Done)
{
return result;
Expand Down Expand Up @@ -6691,48 +6691,6 @@ internal TdsOperationStatus TryReadSqlValue(SqlBuffer value,
return TdsOperationStatus.Done;
}

private TdsOperationStatus TryReadByteArrayWithContinue(TdsParserStateObject stateObj, int length, out byte[] bytes)
{
bytes = null;
int offset = 0;
byte[] temp = null;
(bool canContinue, bool isStarting, bool isContinuing) = stateObj.GetSnapshotStatuses();
if (canContinue)
{
if (isContinuing || isStarting)
{
temp = stateObj.TryTakeSnapshotStorage() as byte[];
Debug.Assert(bytes == null || bytes.Length == length, "stored buffer length must be null or must have been created with the correct length");
}
if (temp != null)
{
offset = stateObj.GetSnapshotTotalSize();
}
}


if (temp == null)
{
temp = new byte[length];
}

TdsOperationStatus result = stateObj.TryReadByteArray(temp, length, out _, offset, isStarting || isContinuing);

if (result == TdsOperationStatus.Done)
{
bytes = temp;
}
else if (result == TdsOperationStatus.NeedMoreData)
{
if (isStarting || isContinuing)
{
stateObj.SetSnapshotStorage(temp);
}
}

return result;
}

private TdsOperationStatus TryReadSqlDateTime(SqlBuffer value, byte tdsType, int length, byte scale, TdsParserStateObject stateObj)
{
Span<byte> datetimeBuffer = ((uint)length <= 16) ? stackalloc byte[16] : new byte[length];
Expand Down
52 changes: 43 additions & 9 deletions src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1497,6 +1497,48 @@ public TdsOperationStatus TryReadByteArray(Span<byte> buff, int len, out int tot
return TdsOperationStatus.Done;
}

public TdsOperationStatus TryReadByteArrayWithContinue(int length, out byte[] bytes)
{
bytes = null;
int offset = 0;
byte[] temp = null;
(bool canContinue, bool isStarting, bool isContinuing) = GetSnapshotStatuses();
if (canContinue)
{
if (isContinuing || isStarting)
{
temp = TryTakeSnapshotStorage() as byte[];
Debug.Assert(bytes == null || bytes.Length == length, "stored buffer length must be null or must have been created with the correct length");
}
if (temp != null)
{
offset = GetSnapshotTotalSize();
}
}


if (temp == null)
{
temp = new byte[length];
}

TdsOperationStatus result = TryReadByteArray(temp, length, out _, offset, isStarting || isContinuing);

if (result == TdsOperationStatus.Done)
{
bytes = temp;
}
else if (result == TdsOperationStatus.NeedMoreData)
{
if (isStarting || isContinuing)
{
SetSnapshotStorage(temp);
}
}

return result;
}

// Takes no arguments and returns a byte from the buffer. If the buffer is empty, it is filled
// before the byte is returned.
internal TdsOperationStatus TryReadByte(out byte value)
Expand Down Expand Up @@ -1843,21 +1885,13 @@ internal TdsOperationStatus TryReadString(int length, out string value)

if (((_inBytesUsed + cBytes) > _inBytesRead) || (_inBytesPacket < cBytes))
{
if (_bTmp == null || _bTmp.Length < cBytes)
{
_bTmp = new byte[cBytes];
}

TdsOperationStatus result = TryReadByteArray(_bTmp, cBytes);
TdsOperationStatus result = TryReadByteArrayWithContinue(cBytes, out buf);
if (result != TdsOperationStatus.Done)
{
value = null;
return result;
}

// assign local to point to parser scratch buffer
buf = _bTmp;

AssertValidState();
}
else
Expand Down
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