Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / Microsoft / SqlServer / Server / SqlRecordBuffer.cs / 1305376 / SqlRecordBuffer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace Microsoft.SqlServer.Server { using System; using System.Data; using System.Data.Common; using System.Data.SqlTypes; using System.Diagnostics; using System.Runtime.InteropServices; internal sealed class SqlRecordBuffer { internal enum StorageType { Boolean, Byte, ByteArray, CharArray, DateTime, DateTimeOffset, Double, Guid, Int16, Int32, Int64, Single, String, SqlDecimal, TimeSpan, } [StructLayout(LayoutKind.Explicit)] internal struct Storage { [FieldOffset(0)] internal Boolean _boolean; [FieldOffset(0)] internal Byte _byte; [FieldOffset(0)] internal DateTime _dateTime; [FieldOffset(0)] internal DateTimeOffset _dateTimeOffset; [FieldOffset(0)] internal Double _double; [FieldOffset(0)] internal Guid _guid; [FieldOffset(0)] internal Int16 _int16; [FieldOffset(0)] internal Int32 _int32; [FieldOffset(0)] internal Int64 _int64; // also used to BytesLength and CharsLength [FieldOffset(0)] internal Single _single; [FieldOffset(0)] internal TimeSpan _timeSpan; } private bool _isNull; private StorageType _type; private Storage _value; private object _object; // String, SqlDecimal private SmiMetaData _metadata; // for variant private bool _isMetaSet; // flag to indicate whether we have set the variant metadata internal SqlRecordBuffer(SmiMetaData metaData) { _isNull = true; } internal bool IsNull { get { return _isNull; } } internal Boolean Boolean { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Boolean == _type, "Wrong storage type: " + _type); return _value._boolean; } set { _value._boolean = value; _type = StorageType.Boolean; _isNull = false; } } internal Byte Byte { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Byte == _type, "Wrong storage type: " + _type); return _value._byte; } set { _value._byte = value; _type = StorageType.Byte; _isNull = false; } } internal DateTime DateTime { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.DateTime == _type, "Wrong storage type: " + _type); return _value._dateTime; } set { _value._dateTime = value; _type = StorageType.DateTime; _isNull = false; } } internal DateTimeOffset DateTimeOffset { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.DateTimeOffset == _type, "Wrong storage type: " + _type); return _value._dateTimeOffset; } set { _value._dateTimeOffset = value; _type = StorageType.DateTimeOffset; _isNull = false; } } internal Double Double { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Double == _type, "Wrong storage type: " + _type); return _value._double; } set { _value._double = value; _type = StorageType.Double; _isNull = false; } } internal Guid Guid { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Guid == _type, "Wrong storage type: " + _type); return _value._guid; } set { _value._guid = value; _type = StorageType.Guid; _isNull = false; } } internal Int16 Int16 { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Int16 == _type, "Wrong storage type: " + _type); return _value._int16; } set { _value._int16 = value; _type = StorageType.Int16; _isNull = false; } } internal Int32 Int32 { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Int32 == _type, "Wrong storage type: " + _type); return _value._int32; } set { _value._int32 = value; _type = StorageType.Int32; _isNull = false; } } internal Int64 Int64 { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Int64 == _type, "Wrong storage type: " + _type); return _value._int64; } set { _value._int64 = value; _type = StorageType.Int64; _isNull = false; if (_isMetaSet) { _isMetaSet = false; } else { _metadata = null; // need to clear the variant metadata } } } internal Single Single { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Single == _type, "Wrong storage type: " + _type); return _value._single; } set { _value._single = value; _type = StorageType.Single; _isNull = false; } } internal String String { get { Debug.Assert(!_isNull, "Null data type"); if (StorageType.String == _type) { return (String)_object; } else if (StorageType.CharArray == _type) { return new String((char[])_object, 0, (int)CharsLength); } else { // Xml may be stored as byte array, yet have GetString called against it. Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); System.IO.Stream byteStream = new System.IO.MemoryStream((byte[])_object, false); return (new SqlXml(byteStream)).Value; } } set { Debug.Assert(null != value, ""); _object = value; _value._int64 = ((string)value).Length; _type = StorageType.String; _isNull = false; if (_isMetaSet) { _isMetaSet = false; } else { _metadata = null; // need to clear the variant metadata } } } internal SqlDecimal SqlDecimal { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.SqlDecimal == _type, "Wrong storage type: " + _type); return (SqlDecimal)_object; } set { Debug.Assert(!value.IsNull, "Null input"); _object = value; _type = StorageType.SqlDecimal; _isNull = false; } } internal TimeSpan TimeSpan { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.TimeSpan == _type, "Wrong storage type: " + _type); return _value._timeSpan; } set { _value._timeSpan = value; _type = StorageType.TimeSpan; _isNull = false; } } internal Int64 BytesLength { get { Debug.Assert(!_isNull, "Null data type"); // sometimes Xml is stored as string, but must support byte access if (StorageType.String == _type) { ConvertXmlStringToByteArray(); } else { Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); } return _value._int64; } set { if (0 == value) { _value._int64 = value; _object = new byte[0]; _type = StorageType.ByteArray; _isNull = false; } else { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); Debug.Assert(value > 0 && value <= ((byte[])_object).Length, "Invalid BytesLength"); _value._int64 = value; } } } internal Int64 CharsLength { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.CharArray == _type || StorageType.String == _type, "Wrong storage type: " + _type); return _value._int64; } set { if (0 == value) { _value._int64 = value; _object = new char[0]; _type = StorageType.CharArray; _isNull = false; } else { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.CharArray == _type || StorageType.String == _type, "Wrong storage type: " + _type); Debug.Assert(value > 0 && ((StorageType.CharArray == _type && value <= ((char[])_object).Length) || (StorageType.String == _type && value <= ((string)_object).Length)), "Invalid CharsLength"); _value._int64 = value; } } } internal SmiMetaData VariantType { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(_metadata == null || _metadata.SqlDbType == SqlDbType.Money || _metadata.SqlDbType == SqlDbType.NVarChar, "Invalid metadata"); switch (_type) { case StorageType.Boolean: return SmiMetaData.DefaultBit; case StorageType.Byte: return SmiMetaData.DefaultTinyInt; case StorageType.ByteArray: return SmiMetaData.DefaultVarBinary; case StorageType.CharArray: return SmiMetaData.DefaultNVarChar; case StorageType.DateTime: return SmiMetaData.DefaultDateTime; case StorageType.DateTimeOffset: return SmiMetaData.DefaultDateTimeOffset; case StorageType.Double: return SmiMetaData.DefaultFloat; case StorageType.Guid: return SmiMetaData.DefaultUniqueIdentifier; case StorageType.Int16: return SmiMetaData.DefaultSmallInt; case StorageType.Int32: return SmiMetaData.DefaultInt; case StorageType.Int64: return _metadata ?? SmiMetaData.DefaultBigInt; case StorageType.Single: return SmiMetaData.DefaultReal; case StorageType.String: return _metadata ?? SmiMetaData.DefaultNVarChar; case StorageType.SqlDecimal: return new SmiMetaData(SqlDbType.Decimal, 17, ((SqlDecimal)_object).Precision, ((SqlDecimal)_object).Scale, 0, SqlCompareOptions.None, null); case StorageType.TimeSpan: return SmiMetaData.DefaultTime; } return null; } set { Debug.Assert(value != null && (value.SqlDbType == SqlDbType.Money || value.SqlDbType == SqlDbType.NVarChar), "Invalid metadata"); _metadata = value; _isMetaSet = true; } } internal int GetBytes(long fieldOffset, byte[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; Debug.Assert(!_isNull, "Null data type"); // sometimes Xml is stored as string, but must support byte access if (StorageType.String == _type) { ConvertXmlStringToByteArray(); } else { Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); } Debug.Assert (null != buffer, "Null buffer"); Debug.Assert(ndataIndex + length <= BytesLength, "Invalid fieldOffset or length"); Buffer.BlockCopy((byte[])_object, ndataIndex, buffer, bufferOffset, length); return length; } internal int GetChars(long fieldOffset, char[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.CharArray == _type || StorageType.String == _type, "Wrong storage type: " + _type); Debug.Assert (null != buffer, "Null buffer"); Debug.Assert(ndataIndex + length <= CharsLength, "Invalid fieldOffset or length"); if (StorageType.CharArray == _type) { Array.Copy((char[])_object, ndataIndex, buffer, bufferOffset, length); } else { // String type ((string)_object).CopyTo(ndataIndex, buffer, bufferOffset, length); } return length; } internal int SetBytes(long fieldOffset, byte[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; if (IsNull || StorageType.ByteArray != _type) { if (ndataIndex != 0) { // set the first time: should start from the beginning throw ADP.ArgumentOutOfRange("fieldOffset"); } _object = new byte[length]; _type = StorageType.ByteArray; _isNull = false; BytesLength = length; } else { if (ndataIndex > BytesLength) { // no gap is allowed throw ADP.ArgumentOutOfRange("fieldOffset"); } if (ndataIndex + length > BytesLength) { // beyond the current length int cbytes = ((byte[])_object).Length; if (ndataIndex + length > cbytes) { // dynamic expansion byte[] data = new byte[Math.Max(ndataIndex + length, 2 * cbytes)]; Buffer.BlockCopy((byte[])_object, 0, data, 0, (int)BytesLength); _object = data; } BytesLength = ndataIndex + length; } } Buffer.BlockCopy(buffer, bufferOffset, (byte[])_object, ndataIndex, length); return length; } internal int SetChars(long fieldOffset, char[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; if (IsNull || (StorageType.CharArray != _type && StorageType.String != _type)) { if (ndataIndex != 0) { // set the first time: should start from the beginning throw ADP.ArgumentOutOfRange("fieldOffset"); } _object = new char[length]; _type = StorageType.CharArray; _isNull = false; CharsLength = length; } else { if (ndataIndex > CharsLength) { // no gap is allowed throw ADP.ArgumentOutOfRange("fieldOffset"); } if (StorageType.String == _type) { // convert string to char[] _object = ((string)_object).ToCharArray(); _type = StorageType.CharArray; } if (ndataIndex + length > CharsLength) { // beyond the current length int cchars = ((char[])_object).Length; if (ndataIndex + length > cchars) { // dynamic expansion char[] data = new char[Math.Max(ndataIndex + length, 2 * cchars)]; Array.Copy((char[])_object, 0, data, 0, CharsLength); _object = data; } CharsLength = ndataIndex + length; } } Array.Copy(buffer, bufferOffset, (char[])_object, ndataIndex, length); return length; } internal void SetNull() { _isNull = true; } // Handle case for Xml where SetString() was called, followed by GetBytes() private void ConvertXmlStringToByteArray() { Debug.Assert(StorageType.String == _type, "ConvertXmlStringToByteArray: Invalid storage type for conversion: " + _type.ToString()); // Grab the unicode bytes, but prepend the XML unicode BOM string value = (string)_object; byte[] bytes = new byte[2 + System.Text.Encoding.Unicode.GetByteCount(value)]; bytes[0] = 0xff; bytes[1] = 0xfe; System.Text.Encoding.Unicode.GetBytes(value, 0, value.Length, bytes, 2); _object = bytes; _value._int64 = bytes.Length; _type = StorageType.ByteArray; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace Microsoft.SqlServer.Server { using System; using System.Data; using System.Data.Common; using System.Data.SqlTypes; using System.Diagnostics; using System.Runtime.InteropServices; internal sealed class SqlRecordBuffer { internal enum StorageType { Boolean, Byte, ByteArray, CharArray, DateTime, DateTimeOffset, Double, Guid, Int16, Int32, Int64, Single, String, SqlDecimal, TimeSpan, } [StructLayout(LayoutKind.Explicit)] internal struct Storage { [FieldOffset(0)] internal Boolean _boolean; [FieldOffset(0)] internal Byte _byte; [FieldOffset(0)] internal DateTime _dateTime; [FieldOffset(0)] internal DateTimeOffset _dateTimeOffset; [FieldOffset(0)] internal Double _double; [FieldOffset(0)] internal Guid _guid; [FieldOffset(0)] internal Int16 _int16; [FieldOffset(0)] internal Int32 _int32; [FieldOffset(0)] internal Int64 _int64; // also used to BytesLength and CharsLength [FieldOffset(0)] internal Single _single; [FieldOffset(0)] internal TimeSpan _timeSpan; } private bool _isNull; private StorageType _type; private Storage _value; private object _object; // String, SqlDecimal private SmiMetaData _metadata; // for variant private bool _isMetaSet; // flag to indicate whether we have set the variant metadata internal SqlRecordBuffer(SmiMetaData metaData) { _isNull = true; } internal bool IsNull { get { return _isNull; } } internal Boolean Boolean { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Boolean == _type, "Wrong storage type: " + _type); return _value._boolean; } set { _value._boolean = value; _type = StorageType.Boolean; _isNull = false; } } internal Byte Byte { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Byte == _type, "Wrong storage type: " + _type); return _value._byte; } set { _value._byte = value; _type = StorageType.Byte; _isNull = false; } } internal DateTime DateTime { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.DateTime == _type, "Wrong storage type: " + _type); return _value._dateTime; } set { _value._dateTime = value; _type = StorageType.DateTime; _isNull = false; } } internal DateTimeOffset DateTimeOffset { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.DateTimeOffset == _type, "Wrong storage type: " + _type); return _value._dateTimeOffset; } set { _value._dateTimeOffset = value; _type = StorageType.DateTimeOffset; _isNull = false; } } internal Double Double { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Double == _type, "Wrong storage type: " + _type); return _value._double; } set { _value._double = value; _type = StorageType.Double; _isNull = false; } } internal Guid Guid { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Guid == _type, "Wrong storage type: " + _type); return _value._guid; } set { _value._guid = value; _type = StorageType.Guid; _isNull = false; } } internal Int16 Int16 { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Int16 == _type, "Wrong storage type: " + _type); return _value._int16; } set { _value._int16 = value; _type = StorageType.Int16; _isNull = false; } } internal Int32 Int32 { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Int32 == _type, "Wrong storage type: " + _type); return _value._int32; } set { _value._int32 = value; _type = StorageType.Int32; _isNull = false; } } internal Int64 Int64 { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Int64 == _type, "Wrong storage type: " + _type); return _value._int64; } set { _value._int64 = value; _type = StorageType.Int64; _isNull = false; if (_isMetaSet) { _isMetaSet = false; } else { _metadata = null; // need to clear the variant metadata } } } internal Single Single { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.Single == _type, "Wrong storage type: " + _type); return _value._single; } set { _value._single = value; _type = StorageType.Single; _isNull = false; } } internal String String { get { Debug.Assert(!_isNull, "Null data type"); if (StorageType.String == _type) { return (String)_object; } else if (StorageType.CharArray == _type) { return new String((char[])_object, 0, (int)CharsLength); } else { // Xml may be stored as byte array, yet have GetString called against it. Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); System.IO.Stream byteStream = new System.IO.MemoryStream((byte[])_object, false); return (new SqlXml(byteStream)).Value; } } set { Debug.Assert(null != value, ""); _object = value; _value._int64 = ((string)value).Length; _type = StorageType.String; _isNull = false; if (_isMetaSet) { _isMetaSet = false; } else { _metadata = null; // need to clear the variant metadata } } } internal SqlDecimal SqlDecimal { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.SqlDecimal == _type, "Wrong storage type: " + _type); return (SqlDecimal)_object; } set { Debug.Assert(!value.IsNull, "Null input"); _object = value; _type = StorageType.SqlDecimal; _isNull = false; } } internal TimeSpan TimeSpan { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.TimeSpan == _type, "Wrong storage type: " + _type); return _value._timeSpan; } set { _value._timeSpan = value; _type = StorageType.TimeSpan; _isNull = false; } } internal Int64 BytesLength { get { Debug.Assert(!_isNull, "Null data type"); // sometimes Xml is stored as string, but must support byte access if (StorageType.String == _type) { ConvertXmlStringToByteArray(); } else { Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); } return _value._int64; } set { if (0 == value) { _value._int64 = value; _object = new byte[0]; _type = StorageType.ByteArray; _isNull = false; } else { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); Debug.Assert(value > 0 && value <= ((byte[])_object).Length, "Invalid BytesLength"); _value._int64 = value; } } } internal Int64 CharsLength { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.CharArray == _type || StorageType.String == _type, "Wrong storage type: " + _type); return _value._int64; } set { if (0 == value) { _value._int64 = value; _object = new char[0]; _type = StorageType.CharArray; _isNull = false; } else { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.CharArray == _type || StorageType.String == _type, "Wrong storage type: " + _type); Debug.Assert(value > 0 && ((StorageType.CharArray == _type && value <= ((char[])_object).Length) || (StorageType.String == _type && value <= ((string)_object).Length)), "Invalid CharsLength"); _value._int64 = value; } } } internal SmiMetaData VariantType { get { Debug.Assert(!_isNull, "Null data type"); Debug.Assert(_metadata == null || _metadata.SqlDbType == SqlDbType.Money || _metadata.SqlDbType == SqlDbType.NVarChar, "Invalid metadata"); switch (_type) { case StorageType.Boolean: return SmiMetaData.DefaultBit; case StorageType.Byte: return SmiMetaData.DefaultTinyInt; case StorageType.ByteArray: return SmiMetaData.DefaultVarBinary; case StorageType.CharArray: return SmiMetaData.DefaultNVarChar; case StorageType.DateTime: return SmiMetaData.DefaultDateTime; case StorageType.DateTimeOffset: return SmiMetaData.DefaultDateTimeOffset; case StorageType.Double: return SmiMetaData.DefaultFloat; case StorageType.Guid: return SmiMetaData.DefaultUniqueIdentifier; case StorageType.Int16: return SmiMetaData.DefaultSmallInt; case StorageType.Int32: return SmiMetaData.DefaultInt; case StorageType.Int64: return _metadata ?? SmiMetaData.DefaultBigInt; case StorageType.Single: return SmiMetaData.DefaultReal; case StorageType.String: return _metadata ?? SmiMetaData.DefaultNVarChar; case StorageType.SqlDecimal: return new SmiMetaData(SqlDbType.Decimal, 17, ((SqlDecimal)_object).Precision, ((SqlDecimal)_object).Scale, 0, SqlCompareOptions.None, null); case StorageType.TimeSpan: return SmiMetaData.DefaultTime; } return null; } set { Debug.Assert(value != null && (value.SqlDbType == SqlDbType.Money || value.SqlDbType == SqlDbType.NVarChar), "Invalid metadata"); _metadata = value; _isMetaSet = true; } } internal int GetBytes(long fieldOffset, byte[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; Debug.Assert(!_isNull, "Null data type"); // sometimes Xml is stored as string, but must support byte access if (StorageType.String == _type) { ConvertXmlStringToByteArray(); } else { Debug.Assert(StorageType.ByteArray == _type, "Wrong storage type: " + _type); } Debug.Assert (null != buffer, "Null buffer"); Debug.Assert(ndataIndex + length <= BytesLength, "Invalid fieldOffset or length"); Buffer.BlockCopy((byte[])_object, ndataIndex, buffer, bufferOffset, length); return length; } internal int GetChars(long fieldOffset, char[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; Debug.Assert(!_isNull, "Null data type"); Debug.Assert(StorageType.CharArray == _type || StorageType.String == _type, "Wrong storage type: " + _type); Debug.Assert (null != buffer, "Null buffer"); Debug.Assert(ndataIndex + length <= CharsLength, "Invalid fieldOffset or length"); if (StorageType.CharArray == _type) { Array.Copy((char[])_object, ndataIndex, buffer, bufferOffset, length); } else { // String type ((string)_object).CopyTo(ndataIndex, buffer, bufferOffset, length); } return length; } internal int SetBytes(long fieldOffset, byte[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; if (IsNull || StorageType.ByteArray != _type) { if (ndataIndex != 0) { // set the first time: should start from the beginning throw ADP.ArgumentOutOfRange("fieldOffset"); } _object = new byte[length]; _type = StorageType.ByteArray; _isNull = false; BytesLength = length; } else { if (ndataIndex > BytesLength) { // no gap is allowed throw ADP.ArgumentOutOfRange("fieldOffset"); } if (ndataIndex + length > BytesLength) { // beyond the current length int cbytes = ((byte[])_object).Length; if (ndataIndex + length > cbytes) { // dynamic expansion byte[] data = new byte[Math.Max(ndataIndex + length, 2 * cbytes)]; Buffer.BlockCopy((byte[])_object, 0, data, 0, (int)BytesLength); _object = data; } BytesLength = ndataIndex + length; } } Buffer.BlockCopy(buffer, bufferOffset, (byte[])_object, ndataIndex, length); return length; } internal int SetChars(long fieldOffset, char[] buffer, int bufferOffset, int length) { int ndataIndex = (int)fieldOffset; if (IsNull || (StorageType.CharArray != _type && StorageType.String != _type)) { if (ndataIndex != 0) { // set the first time: should start from the beginning throw ADP.ArgumentOutOfRange("fieldOffset"); } _object = new char[length]; _type = StorageType.CharArray; _isNull = false; CharsLength = length; } else { if (ndataIndex > CharsLength) { // no gap is allowed throw ADP.ArgumentOutOfRange("fieldOffset"); } if (StorageType.String == _type) { // convert string to char[] _object = ((string)_object).ToCharArray(); _type = StorageType.CharArray; } if (ndataIndex + length > CharsLength) { // beyond the current length int cchars = ((char[])_object).Length; if (ndataIndex + length > cchars) { // dynamic expansion char[] data = new char[Math.Max(ndataIndex + length, 2 * cchars)]; Array.Copy((char[])_object, 0, data, 0, CharsLength); _object = data; } CharsLength = ndataIndex + length; } } Array.Copy(buffer, bufferOffset, (char[])_object, ndataIndex, length); return length; } internal void SetNull() { _isNull = true; } // Handle case for Xml where SetString() was called, followed by GetBytes() private void ConvertXmlStringToByteArray() { Debug.Assert(StorageType.String == _type, "ConvertXmlStringToByteArray: Invalid storage type for conversion: " + _type.ToString()); // Grab the unicode bytes, but prepend the XML unicode BOM string value = (string)_object; byte[] bytes = new byte[2 + System.Text.Encoding.Unicode.GetByteCount(value)]; bytes[0] = 0xff; bytes[1] = 0xfe; System.Text.Encoding.Unicode.GetBytes(value, 0, value.Length, bytes, 2); _object = bytes; _value._int64 = bytes.Length; _type = StorageType.ByteArray; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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