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386 lines
8.9 KiB
386 lines
8.9 KiB
#if MYSQL_6_9
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// Copyright © 2004, 2015, Oracle and/or its affiliates. All rights reserved.
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//
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// MySQL Connector/NET is licensed under the terms of the GPLv2
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// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
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// MySQL Connectors. There are special exceptions to the terms and
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// conditions of the GPLv2 as it is applied to this software, see the
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// FLOSS License Exception
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// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation; version 2 of the License.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, write to the Free Software Foundation, Inc.,
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// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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using System;
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using System.Diagnostics;
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using System.Text;
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using System.IO;
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using Externals.MySql.Data.Common;
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using Externals.MySql.Data.MySqlClient.Properties;
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namespace Externals.MySql.Data.MySqlClient
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{
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class MySqlPacket
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{
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private byte[] tempBuffer = new byte[256];
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private Encoding encoding;
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private MemoryStream buffer = new MemoryStream(5);
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private DBVersion version;
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private MySqlPacket()
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{
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Clear();
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}
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public MySqlPacket(Encoding enc)
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: this()
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{
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Encoding = enc;
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}
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public MySqlPacket(MemoryStream stream)
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: this()
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{
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buffer = stream;
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}
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#region Properties
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public Encoding Encoding
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{
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get { return encoding; }
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set
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{
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Debug.Assert(value != null);
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encoding = value;
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}
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}
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public bool HasMoreData
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{
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get { return buffer.Position < buffer.Length; }
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}
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public int Position
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{
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get { return (int)buffer.Position; }
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set { buffer.Position = (long)value; }
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}
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public int Length
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{
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get { return (int)buffer.Length; }
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set { buffer.SetLength(value); }
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}
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public bool IsLastPacket
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{
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get
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{
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byte[] bits = buffer.GetBuffer();
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return bits[0] == 0xfe && Length <= 5;
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}
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}
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public byte[] Buffer
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{
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get { return buffer.GetBuffer(); }
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}
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public DBVersion Version
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{
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get { return version; }
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set { version = value; }
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}
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#endregion
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public void Clear()
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{
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Position = 4;
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}
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#region Byte methods
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public byte ReadByte()
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{
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return (byte)buffer.ReadByte();
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}
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public int Read(byte[] byteBuffer, int offset, int count)
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{
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return buffer.Read(byteBuffer, offset, count);
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}
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public void WriteByte(byte b)
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{
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buffer.WriteByte(b);
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}
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public void Write(byte[] bytesToWrite)
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{
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Write(bytesToWrite, 0, bytesToWrite.Length);
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}
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public void Write(byte[] bytesToWrite, int offset, int countToWrite)
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{
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buffer.Write(bytesToWrite, offset, countToWrite);
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}
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public int ReadNBytes()
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{
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byte c = ReadByte();
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if (c < 1 || c > 4)
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throw new MySqlException(Resources.IncorrectTransmission);
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return ReadInteger(c);
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}
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public void SetByte(long position, byte value)
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{
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long currentPosition = buffer.Position;
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buffer.Position = position;
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buffer.WriteByte(value);
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buffer.Position = currentPosition;
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}
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#endregion
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#region Integer methods
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public long ReadFieldLength()
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{
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byte c = ReadByte();
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switch (c)
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{
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case 251: return -1;
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case 252: return ReadInteger(2);
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case 253: return ReadInteger(3);
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case 254: return ReadLong(8);
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default: return c;
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}
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}
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public ulong ReadBitValue(int numbytes)
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{
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ulong value = 0;
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int pos = (int)buffer.Position;
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byte[] bits = buffer.GetBuffer();
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int shift = 0;
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for (int i = 0; i < numbytes; i++)
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{
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value <<= shift;
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value |= bits[pos++];
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shift = 8;
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}
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buffer.Position += numbytes;
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return value;
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}
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public long ReadLong(int numbytes)
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{
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Debug.Assert((buffer.Position + numbytes) <= buffer.Length);
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byte[] bytes = buffer.GetBuffer();
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int pos = (int)buffer.Position;
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buffer.Position += numbytes;
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switch (numbytes)
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{
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case 2: return BitConverter.ToUInt16(bytes, pos);
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case 4: return BitConverter.ToUInt32(bytes, pos);
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case 8: return BitConverter.ToInt64(bytes, pos);
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}
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throw new NotSupportedException("Only byte lengths of 2, 4, or 8 are supported");
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}
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public ulong ReadULong(int numbytes)
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{
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Debug.Assert((buffer.Position + numbytes) <= buffer.Length);
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byte[] bytes = buffer.GetBuffer();
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int pos = (int)buffer.Position;
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buffer.Position += numbytes;
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switch (numbytes)
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{
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case 2: return BitConverter.ToUInt16(bytes, pos);
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case 4: return BitConverter.ToUInt32(bytes, pos);
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case 8: return BitConverter.ToUInt64(bytes, pos);
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}
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throw new NotSupportedException("Only byte lengths of 2, 4, or 8 are supported");
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}
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public int Read3ByteInt()
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{
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int value = 0;
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int pos = (int)buffer.Position;
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byte[] bits = buffer.GetBuffer();
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int shift = 0;
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for (int i = 0; i < 3; i++)
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{
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value |= (int)(bits[pos++] << shift);
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shift += 8;
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}
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buffer.Position += 3;
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return value;
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}
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public int ReadInteger(int numbytes)
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{
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if (numbytes == 3)
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return Read3ByteInt();
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Debug.Assert(numbytes <= 4);
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return (int)ReadLong(numbytes);
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}
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/// <summary>
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/// WriteInteger
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/// </summary>
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/// <param name="v"></param>
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/// <param name="numbytes"></param>
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public void WriteInteger(long v, int numbytes)
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{
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long val = v;
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Debug.Assert(numbytes > 0 && numbytes < 9);
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for (int x = 0; x < numbytes; x++)
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{
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tempBuffer[x] = (byte)(val & 0xff);
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val >>= 8;
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}
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Write(tempBuffer, 0, numbytes);
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}
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public int ReadPackedInteger()
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{
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byte c = ReadByte();
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switch (c)
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{
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case 251: return -1;
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case 252: return ReadInteger(2);
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case 253: return ReadInteger(3);
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case 254: return ReadInteger(4);
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default: return c;
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}
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}
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public void WriteLength(long length)
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{
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if (length < 251)
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WriteByte((byte)length);
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else if (length < 65536L)
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{
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WriteByte(252);
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WriteInteger(length, 2);
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}
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else if (length < 16777216L)
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{
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WriteByte(253);
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WriteInteger(length, 3);
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}
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else
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{
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WriteByte(254);
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WriteInteger(length, 4);
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}
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}
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#endregion
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#region String methods
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public void WriteLenString(string s)
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{
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byte[] bytes = encoding.GetBytes(s);
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WriteLength(bytes.Length);
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Write(bytes, 0, bytes.Length);
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}
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public void WriteStringNoNull(string v)
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{
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byte[] bytes = encoding.GetBytes(v);
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Write(bytes, 0, bytes.Length);
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}
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public void WriteString(string v)
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{
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WriteStringNoNull(v);
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WriteByte(0);
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}
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public string ReadLenString()
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{
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long len = ReadPackedInteger();
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return ReadString(len);
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}
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public string ReadAsciiString(long length)
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{
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if (length == 0)
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return String.Empty;
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// byte[] buf = new byte[length];
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Read(tempBuffer, 0, (int)length);
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return Encoding.GetEncoding("us-ascii").GetString(tempBuffer, 0, (int)length);
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//return encoding.GetString(tempBuffer, 0, (int)length); //buf.Length);
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}
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public string ReadString(long length)
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{
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if (length == 0)
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return String.Empty;
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if (tempBuffer == null || length > tempBuffer.Length)
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tempBuffer = new byte[length];
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Read(tempBuffer, 0, (int)length);
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return encoding.GetString(tempBuffer, 0, (int)length);
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}
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public string ReadString()
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{
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return ReadString(encoding);
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}
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public string ReadString(Encoding theEncoding)
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{
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byte[] bytes = ReadStringAsBytes();
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string s = theEncoding.GetString(bytes, 0, bytes.Length);
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return s;
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}
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public byte[] ReadStringAsBytes()
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{
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byte[] readBytes;
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byte[] tempBuffer = buffer.GetBuffer();
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int end = (int)buffer.Position;
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while (end < (int)buffer.Length &&
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tempBuffer[end] != 0 && (int)tempBuffer[end] != -1)
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end++;
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readBytes = new byte[end - buffer.Position];
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Array.Copy(tempBuffer, (int)buffer.Position, readBytes, 0, (int)(end - buffer.Position));
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buffer.Position = end + 1;
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return readBytes;
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}
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#endregion
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}
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}
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#endif
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