public static ResourceRecord Parse(byte [] buffer, ref int offset)
{
string name;
if ((buffer[offset] & 0xc0) == 0xc0)
{
// Detected compression. Name is at offset in
// lower 14 bits of next 2 bytes.
int start = NetworkBitConverter.ToInt16(buffer, offset);
if (LabelEncoding.GetString(buffer, start & 0x3fff,
out name) == 0)
{
throw new InvalidDnsFormatException("name");
}
offset += 2;
}
else
{
int used = LabelEncoding.GetString(buffer, offset, out name);
if (used == 0)
{
throw new InvalidDnsFormatException("name");
}
offset += used;
}
ushort rType = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
ushort rClass = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
uint ttlSeconds = NetworkBitConverter.ToUInt32(buffer, offset);
offset += 4;
ushort rdataLength = NetworkBitConverter.ToUInt16(buffer, offset);
offset += 2;
byte [] rdata = new byte[rdataLength];
Array.Copy(buffer, offset, rdata, 0, rdataLength);
offset += rdataLength;
return(new ResourceRecord(name, (Type)rType, (Class)rClass,
ttlSeconds, rdata));
}
/// <summary>
/// 将客户端转来的byte[]转换成指定对象（自定义协议）
/// </summary>
/// <param name="connection"></param>
/// <param name="buffer"></param>
/// <param name="maxMessageSize"></param>
/// <param name="readlength"></param>
/// <returns></returns>
/// <exception cref="BadProtocolException">bad async binary protocl</exception>
public DSSBinaryCommandInfo FindCommandInfo(IConnection connection, ArraySegment <byte> buffer,
int maxMessageSize, out int readlength)
{
if (buffer.Count < 4)
{
readlength = 0; return(null);
}
var payload = buffer.Array;
//获取message length
var messageLength = NetworkBitConverter.ToInt32(payload, buffer.Offset);
if (messageLength < 7)
{
throw new BadProtocolException("bad async binary protocl");
}
if (messageLength > maxMessageSize)
{
throw new BadProtocolException("message is too long");
}
readlength = messageLength + 4;
if (buffer.Count < readlength)
{
readlength = 0; return(null);
}
var seqID = NetworkBitConverter.ToInt32(payload, buffer.Offset + 4);
var projectID = NetworkBitConverter.ToInt16(payload, buffer.Offset + 8);
var extProperty = NetworkBitConverter.ToInt16(payload, buffer.Offset + 10);
var cmdNameLength = NetworkBitConverter.ToInt16(payload, buffer.Offset + 12);
var versionNumberLength = NetworkBitConverter.ToInt16(payload, buffer.Offset + 14);
var projectNameLength = NetworkBitConverter.ToInt16(payload, buffer.Offset + 16);
var strName = Encoding.UTF8.GetString(payload, buffer.Offset + 18, cmdNameLength);
var versionNumber = Encoding.UTF8.GetString(payload, buffer.Offset + 18 + cmdNameLength, versionNumberLength);
var projectName = Encoding.UTF8.GetString(payload, buffer.Offset + 18 + cmdNameLength + versionNumberLength, projectNameLength);
var dataLength = messageLength - 12 - cmdNameLength - versionNumberLength - projectNameLength;
byte[] data = null;
if (dataLength > 0)
{
data = new byte[dataLength];
Buffer.BlockCopy(payload, buffer.Offset + 18 + cmdNameLength + versionNumberLength + projectNameLength, data, 0, dataLength);
}
return(new DSSBinaryCommandInfo(seqID, projectID, projectName, extProperty, strName, versionNumber, data));
}
/// <summary>
/// find response
/// </summary>
/// <param name="connection"></param>
/// <param name="buffer"></param>
/// <param name="readlength"></param>
/// <returns></returns>
/// <exception cref="BadProtocolException">bad async binary protocl</exception>
public DSSBinaryResponse FindResponse(IConnection connection, ArraySegment <byte> buffer, out int readlength)
{
if (buffer.Count < 4)
{
readlength = 0; return(null);
}
//获取message length
var messageLength = NetworkBitConverter.ToInt32(buffer.Array, buffer.Offset);
if (messageLength < 7)
{
throw new BadProtocolException("bad async binary protocl");
}
readlength = messageLength + 4;
if (buffer.Count < readlength)
{
readlength = 0; return(null);
}
var seqID = NetworkBitConverter.ToInt32(buffer.Array, buffer.Offset + 4);
var projectID = NetworkBitConverter.ToInt16(buffer.Array, buffer.Offset + 8);
var extProperty = NetworkBitConverter.ToInt16(buffer.Array, buffer.Offset + 10);
var flagLength = NetworkBitConverter.ToInt16(buffer.Array, buffer.Offset + 12);
var versonLength = NetworkBitConverter.ToInt16(buffer.Array, buffer.Offset + 14);
var projectNameLength = NetworkBitConverter.ToInt16(buffer.Array, buffer.Offset + 16);
var strName = Encoding.UTF8.GetString(buffer.Array, buffer.Offset + 18, flagLength);
var versionNumber = Encoding.UTF8.GetString(buffer.Array, buffer.Offset + 18 + flagLength, versonLength);
var projectName = Encoding.UTF8.GetString(buffer.Array, buffer.Offset + 18 + flagLength + versonLength, projectNameLength);
var dataLength = messageLength - 16 - flagLength - versonLength - projectNameLength;
byte[] data = null;
if (dataLength > 0)
{
data = new byte[dataLength];
Buffer.BlockCopy(buffer.Array, buffer.Offset + 18 + flagLength + versonLength + projectNameLength, data, 0, dataLength);
}
return(new DSSBinaryResponse(seqID, projectID, projectName, extProperty, strName, versionNumber, data));
}