void Decode(byte[] buffer, int startIndex, int length, bool unicode)
{
int index = startIndex;
do
{
var type = BitConverterLE.ToInt16(buffer, index);
index += 2;
switch (type)
{
case 1: ServerName = DecodeString(buffer, ref index, unicode); break;
case 2: DomainName = DecodeString(buffer, ref index, unicode); break;
case 3: DnsServerName = DecodeString(buffer, ref index, unicode); break;
case 4: DnsDomainName = DecodeString(buffer, ref index, unicode); break;
case 5: DnsTreeName = DecodeString(buffer, ref index, unicode); break;
case 6: Flags = DecodeFlags(buffer, ref index); break;
case 7: Timestamp = DecodeTimestamp(buffer, ref index); break;
case 9: TargetName = DecodeString(buffer, ref index, unicode); break;
default: index += 2 + BitConverterLE.ToInt16(buffer, index); break;
}
} while (index < startIndex + length);
}
static long DecodeTimestamp(byte[] buffer, ref int index, out short size)
{
size = BitConverterLE.ToInt16(buffer, index);
long value;
index += 2;
switch (size)
{
case 8:
long lo = BitConverterLE.ToUInt32(buffer, index);
long hi = BitConverterLE.ToUInt32(buffer, index + 4);
value = (hi << 32) | lo;
break;
case 4: value = BitConverterLE.ToUInt32(buffer, index); break;
case 2: value = BitConverterLE.ToUInt16(buffer, index); break;
default: value = 0; break;
}
index += size;
return(value);
}
static long DecodeTimestamp(byte[] buffer, ref int index)
{
short nbytes = BitConverterLE.ToInt16(buffer, index);
long lo, hi;
index += 2;
switch (nbytes)
{
case 8:
lo = BitConverterLE.ToUInt32(buffer, index);
index += 4;
hi = BitConverterLE.ToUInt32(buffer, index);
index += 4;
return((hi << 32) | lo);
case 4:
lo = BitConverterLE.ToUInt32(buffer, index);
index += 4;
return(lo);
case 2:
lo = BitConverterLE.ToUInt16(buffer, index);
index += 2;
return(lo);
default:
index += nbytes;
return(0);
}
}
static int DecodeFlags(byte[] buffer, ref int index)
{
short nbytes = BitConverterLE.ToInt16(buffer, index);
int value = BitConverterLE.ToInt32(buffer, index + 2);
index += 6;
return(value);
}
static string DecodeString(byte[] buffer, ref int index, bool unicode)
{
var encoding = unicode ? Encoding.Unicode : Encoding.UTF8;
var length = BitConverterLE.ToInt16(buffer, index);
var value = encoding.GetString(buffer, index + 2, length);
index += 2 + length;
return(value);
}
void Decode(byte[] buffer, int startIndex, int length, bool unicode)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
if (startIndex < 0 || startIndex > buffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(startIndex));
}
if (length < 12 || length > (buffer.Length - startIndex))
{
throw new ArgumentOutOfRangeException(nameof(length));
}
int index = startIndex;
do
{
var attr = (NtlmAttribute)BitConverterLE.ToInt16(buffer, index);
short size;
index += 2;
switch (attr)
{
case NtlmAttribute.EOL:
index = startIndex + length;
break;
case NtlmAttribute.ServerName:
case NtlmAttribute.DomainName:
case NtlmAttribute.DnsServerName:
case NtlmAttribute.DnsDomainName:
case NtlmAttribute.DnsTreeName:
case NtlmAttribute.TargetName:
attributes.Add(new NtlmAttributeStringValuePair(attr, DecodeString(buffer, ref index, unicode)));
break;
case NtlmAttribute.Flags:
attributes.Add(new NtlmAttributeFlagsValuePair(attr, DecodeFlags(buffer, ref index, out size), size));
break;
case NtlmAttribute.Timestamp:
attributes.Add(new NtlmAttributeTimestampValuePair(attr, DecodeTimestamp(buffer, ref index, out size), size));
break;
default:
attributes.Add(new NtlmAttributeByteArrayValuePair(attr, DecodeByteArray(buffer, ref index)));
break;
}
} while (index < startIndex + length);
}
static byte[] DecodeByteArray(byte[] buffer, ref int index)
{
var length = BitConverterLE.ToInt16(buffer, index);
var value = new byte[length];
Buffer.BlockCopy(buffer, index + 2, value, 0, length);
index += 2 + length;
return(value);
}
static string DecodeString(byte[] buffer, ref int index, bool unicode)
{
short length = BitConverterLE.ToInt16(buffer, index);
string value;
if (unicode)
{
value = Encoding.Unicode.GetString(buffer, index + 2, length);
}
else
{
value = Encoding.ASCII.GetString(buffer, index + 2, length);
}
index += 2 + length;
return(value);
}
static int DecodeFlags(byte[] buffer, ref int index)
{
short nbytes = BitConverterLE.ToInt16(buffer, index);
int flags;
index += 2;
switch (nbytes)
{
case 4: flags = BitConverterLE.ToInt32(buffer, index); break;
case 2: flags = BitConverterLE.ToInt16(buffer, index); break;
default: flags = 0; break;
}
index += nbytes;
return(flags);
}
static int DecodeFlags(byte[] buffer, ref int index, out short size)
{
size = BitConverterLE.ToInt16(buffer, index);
int flags;
index += 2;
switch (size)
{
case 4: flags = BitConverterLE.ToInt32(buffer, index); break;
case 2: flags = BitConverterLE.ToInt16(buffer, index); break;
default: flags = 0; break;
}
index += size;
return(flags);
}
