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using System;
using System.Collections.Generic;
using System.Text;
namespace Heijden.DNS
{
public class RecordReader
{
private byte[] m_Data;
private int m_Position;
public RecordReader(byte[] data)
{
m_Data = data;
m_Position = 0;
}
public int Position
{
get
{
return m_Position;
}
set
{
m_Position = value;
}
}
public int Length
{
get
{
if (m_Data == null)
return 0;
else
return m_Data.Length;
}
}
public RecordReader(byte[] data, int Position)
{
m_Data = data;
m_Position = Position;
}
public byte ReadByte()
{
if (m_Position >= m_Data.Length)
return 0;
else
return m_Data[m_Position++];
}
public char ReadChar()
{
return (char)ReadByte();
}
public UInt16 ReadUInt16()
{
return (UInt16)(ReadByte() << 8 | ReadByte());
}
public UInt16 ReadUInt16(int offset)
{
m_Position += offset;
return ReadUInt16();
}
public UInt32 ReadUInt32()
{
return (UInt32)(ReadUInt16() << 16 | ReadUInt16());
}
public string ReadDomainName()
{
StringBuilder name = new StringBuilder();
int length = 0;
// get the length of the first label
while ((length = ReadByte()) != 0)
{
// top 2 bits set denotes domain name compression and to reference elsewhere
if ((length & 0xc0) == 0xc0)
{
// work out the existing domain name, copy this pointer
RecordReader newRecordReader = new RecordReader(m_Data, (length & 0x3f) << 8 | ReadByte());
name.Append(newRecordReader.ReadDomainName());
return name.ToString();
}
// if not using compression, copy a char at a time to the domain name
while (length > 0)
{
name.Append(ReadChar());
length--;
}
name.Append('.');
}
if (name.Length == 0)
return ".";
else
return name.ToString();
}
public string ReadString()
{
short length = this.ReadByte();
StringBuilder str = new StringBuilder();
for(int intI=0;intI<length;intI++)
str.Append(ReadChar());
return str.ToString();
}
// changed 28 augustus 2008
public byte[] ReadBytes(int intLength)
{
byte[] list = new byte[intLength];
for (int intI = 0; intI < intLength; intI++)
list[intI] = ReadByte();
return list;
}
public Record ReadRecord(Type type, int Length)
{
switch (type)
{
case Type.A:
return new RecordA(this);
case Type.NS:
return new RecordNS(this);
case Type.MD:
return new RecordMD(this);
case Type.MF:
return new RecordMF(this);
case Type.CNAME:
return new RecordCNAME(this);
case Type.SOA:
return new RecordSOA(this);
case Type.MB:
return new RecordMB(this);
case Type.MG:
return new RecordMG(this);
case Type.MR:
return new RecordMR(this);
case Type.NULL:
return new RecordNULL(this);
case Type.WKS:
return new RecordWKS(this);
case Type.PTR:
return new RecordPTR(this);
case Type.HINFO:
return new RecordHINFO(this);
case Type.MINFO:
return new RecordMINFO(this);
case Type.MX:
return new RecordMX(this);
case Type.TXT:
return new RecordTXT(this, Length);
case Type.RP:
return new RecordRP(this);
case Type.AFSDB:
return new RecordAFSDB(this);
case Type.X25:
return new RecordX25(this);
case Type.ISDN:
return new RecordISDN(this);
case Type.RT:
return new RecordRT(this);
case Type.NSAP:
return new RecordNSAP(this);
case Type.NSAPPTR:
return new RecordNSAPPTR(this);
case Type.SIG:
return new RecordSIG(this);
case Type.KEY:
return new RecordKEY(this);
case Type.PX:
return new RecordPX(this);
case Type.GPOS:
return new RecordGPOS(this);
case Type.AAAA:
return new RecordAAAA(this);
case Type.LOC:
return new RecordLOC(this);
case Type.NXT:
return new RecordNXT(this);
case Type.EID:
return new RecordEID(this);
case Type.NIMLOC:
return new RecordNIMLOC(this);
case Type.SRV:
return new RecordSRV(this);
case Type.ATMA:
return new RecordATMA(this);
case Type.NAPTR:
return new RecordNAPTR(this);
case Type.KX:
return new RecordKX(this);
case Type.CERT:
return new RecordCERT(this);
case Type.A6:
return new RecordA6(this);
case Type.DNAME:
return new RecordDNAME(this);
case Type.SINK:
return new RecordSINK(this);
case Type.OPT:
return new RecordOPT(this);
case Type.APL:
return new RecordAPL(this);
case Type.DS:
return new RecordDS(this);
case Type.SSHFP:
return new RecordSSHFP(this);
case Type.IPSECKEY:
return new RecordIPSECKEY(this);
case Type.RRSIG:
return new RecordRRSIG(this);
case Type.NSEC:
return new RecordNSEC(this);
case Type.DNSKEY:
return new RecordDNSKEY(this);
case Type.DHCID:
return new RecordDHCID(this);
case Type.NSEC3:
return new RecordNSEC3(this);
case Type.NSEC3PARAM:
return new RecordNSEC3PARAM(this);
case Type.HIP:
return new RecordHIP(this);
case Type.SPF:
return new RecordSPF(this);
case Type.UINFO:
return new RecordUINFO(this);
case Type.UID:
return new RecordUID(this);
case Type.GID:
return new RecordGID(this);
case Type.UNSPEC:
return new RecordUNSPEC(this);
case Type.TKEY:
return new RecordTKEY(this);
case Type.TSIG:
return new RecordTSIG(this);
default:
return new RecordUnknown(this);
}
}
}
}
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Vasudevan Deepak Kumar is from Chennai, India who has been in the programming career since 1994, when he was 15 years old. He has his Bachelors of Engineering (in Computer Science and Engineering) from
Vellore Engineering College. He also has a MBA in Systems from
Alagappa University, Karaikudi, India.
He started his programming career with GWBasic and then in his college was involved in developing programs in Fortran, Cobol, C++. He has been developing in Microsoft technologies like ASP, SQLServer 2000.
His current focus is ASP.NET, C#, VB.NET, PHP, SQL Server and MySQL. In his past-time, he listens to polite Carnatic Music. But the big question is that with his current Todolist backlog, does he get some past time?