// Reads off from the network buffer and caches bytes. Only reads one column value in the current row.
static internal bool TryCreate(SqlMetaDataPriv metadata, TdsParser parser, TdsParserStateObject stateObj, out SqlCachedBuffer buffer)
{
int cb = 0;
ulong plplength;
byte[] byteArr;
List <byte[]> cachedBytes = new List <byte[]>();
buffer = null;
// the very first length is already read.
if (!parser.TryPlpBytesLeft(stateObj, out plplength))
{
return(false);
}
// For now we only handle Plp data from the parser directly.
Debug.Assert(metadata.metaType.IsPlp, "SqlCachedBuffer call on a non-plp data");
do
{
if (plplength == 0)
{
break;
}
do
{
cb = (plplength > (ulong)_maxChunkSize) ? _maxChunkSize : (int)plplength;
byteArr = new byte[cb];
if (!stateObj.TryReadPlpBytes(ref byteArr, 0, cb, out cb))
{
return(false);
}
Debug.Assert(cb == byteArr.Length);
if (cachedBytes.Count == 0)
{
// Add the Byte order mark if needed if we read the first array
AddByteOrderMark(byteArr, cachedBytes);
}
cachedBytes.Add(byteArr);
plplength -= (ulong)cb;
} while (plplength > 0);
if (!parser.TryPlpBytesLeft(stateObj, out plplength))
{
return(false);
}
} while (plplength > 0);
Debug.Assert(stateObj._longlen == 0 && stateObj._longlenleft == 0);
buffer = new SqlCachedBuffer(cachedBytes);
return(true);
}
internal virtual void CopyFrom(SqlMetaDataPriv original)
{
this.type = original.type;
this.tdsType = original.tdsType;
this.precision = original.precision;
this.scale = original.scale;
this.length = original.length;
this.collation = original.collation;
this.codePage = original.codePage;
this.encoding = original.encoding;
this.isNullable = original.isNullable;
this.xmlSchemaCollectionDatabase = original.xmlSchemaCollectionDatabase;
this.xmlSchemaCollectionOwningSchema = original.xmlSchemaCollectionOwningSchema;
this.xmlSchemaCollectionName = original.xmlSchemaCollectionName;
this.metaType = original.metaType;
}