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Add and use TryReadChars method #1544

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merged 5 commits into from
Feb 10, 2023
Merged

Add and use TryReadChars method #1544

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7674cdf
add and use TryReadChars method
Wraith2 Mar 13, 2022
600f607
fixes
Wraith2 Mar 14, 2022
01514a6
minor update for CI results
Wraith2 Apr 13, 2022
63668a3
revert sln change
Wraith2 Aug 18, 2022
2ad4391
move TryReadChars to shared and cleanup
Wraith2 Feb 3, 2023
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16 changes: 8 additions & 8 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 @@ -12501,18 +12501,18 @@ private bool TryReadPlpUnicodeCharsChunk(char[] buff, int offst, int len, TdsPar
return true;
}

charsRead = len;
int charsToRead = len;

// stateObj._longlenleft is in bytes
if ((stateObj._longlenleft >> 1) < (ulong)len)
charsRead = (int)(stateObj._longlenleft >> 1);
if ((stateObj._longlenleft / 2) < (ulong)len)
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{
charsToRead = (int)(stateObj._longlenleft >> 1);
}

for (int ii = 0; ii < charsRead; ii++)
if (!stateObj.TryReadChars(buff, offst, charsToRead, out charsRead))
{
if (!stateObj.TryReadChar(out buff[offst + ii]))
{
return false;
}
charsRead = 0;
return false;
}

stateObj._longlenleft -= ((ulong)charsRead << 1);
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4 changes: 1 addition & 3 deletions src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs
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Expand Up @@ -3,12 +3,9 @@
// See the LICENSE file in the project root for more information.

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Security;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Data.Common;
Expand Down Expand Up @@ -487,6 +484,7 @@ internal bool TryReadChar(out char value)

AssertValidState();
value = (char)((buffer[1] << 8) + buffer[0]);

return true;
}

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17 changes: 8 additions & 9 deletions src/Microsoft.Data.SqlClient/netfx/src/Microsoft/Data/SqlClient/TdsParser.cs
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Expand Up @@ -13528,7 +13528,6 @@ internal void WriteParameterVarLen(MetaType type, int size, bool isNull, TdsPars
// Returns the actual chars read
private bool TryReadPlpUnicodeCharsChunk(char[] buff, int offst, int len, TdsParserStateObject stateObj, out int charsRead)
{

Debug.Assert((buff == null && len == 0) || (buff.Length >= offst + len), "Invalid length sent to ReadPlpUnicodeChars()!");
Debug.Assert((stateObj._longlen != 0) && (stateObj._longlen != TdsEnums.SQL_PLP_NULL),
"Out of sync plp read request");
Expand All @@ -13539,18 +13538,18 @@ private bool TryReadPlpUnicodeCharsChunk(char[] buff, int offst, int len, TdsPar
return true;
}

charsRead = len;
int charsToRead = len;

// stateObj._longlenleft is in bytes
if ((stateObj._longlenleft >> 1) < (ulong)len)
charsRead = (int)(stateObj._longlenleft >> 1);
if ((stateObj._longlenleft / 2) < (ulong)len)
{
charsToRead = (int)(stateObj._longlenleft >> 1);
}

for (int ii = 0; ii < charsRead; ii++)
if (!stateObj.TryReadChars(buff, offst, charsToRead, out charsRead))
{
if (!stateObj.TryReadChar(out buff[offst + ii]))
{
return false;
}
charsRead = 0;
return false;
}

stateObj._longlenleft -= ((ulong)charsRead << 1);
Expand Down
45 changes: 45 additions & 0 deletions src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/TdsParserStateObject.cs
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Expand Up @@ -436,6 +436,51 @@ internal bool TryStartNewRow(bool isNullCompressed, int nullBitmapColumnsCount =
return true;
}

internal bool TryReadChars(char[] chars, int charsOffset, int charsCount, out int charsCopied)
{
charsCopied = 0;
while (charsCopied < charsCount)
{
// check if the current buffer contains some bytes we need to copy and copy them
// in a block
int bytesToRead = Math.Min(
(charsCount - charsCopied) * 2,
unchecked((_inBytesRead - _inBytesUsed) & (int)0xFFFFFFFE) // it the result is odd take off the 0 to make it even
);
if (bytesToRead > 0)
{
Buffer.BlockCopy(
_inBuff,
_inBytesUsed,
chars,
(charsOffset + charsCopied) * 2, // offset in bytes,
bytesToRead
);
charsCopied += (bytesToRead / 2);
_inBytesUsed += bytesToRead;
_inBytesPacket -= bytesToRead;
}

// if the number of chars requested is lower than the number copied then we need
// to request a new packet, use TryReadChar() to do this then loop back to see
// if we can copy another bulk of chars from the new buffer

if (charsCopied < charsCount)
{
bool result = TryReadChar(out chars[charsOffset + charsCopied]);
if (result)
{
charsCopied += 1;
}
else
{
return false;
}
}
}
return true;
}

internal bool IsRowTokenReady()
{
// Removing one byte since TryReadByteArray\TryReadByte will aggressively read the next packet if there is no data left - so we need to ensure there is a spare byte
Expand Down