/**
* Read the address out of the buffer This makes a copy
* and calls Parse on the copy. This is a "convienience" method.
* @throw ParseException if the buffer is not a valid address
*/
static public Address Parse(MemBlock mb)
{
//Read some of the least significant bytes out,
//AHAddress all have last bit 0, so we skip the last byte which
//will have less entropy
ushort idx = (ushort)NumberSerializer.ReadShort(mb, Address.MemSize - 3);
Address a = _mb_cache[idx];
if (a != null)
{
if (a.ToMemBlock().Equals(mb))
{
return(a);
}
}
//Else we need to read the address and put it in the cache
try {
if (2 * mb.Length < mb.ReferencedBufferLength)
{
/*
* This MemBlock is much smaller than the array
* we are referencing, don't keep the big one
* in scope, instead make a copy
*/
mb = MemBlock.Copy((ICopyable)mb);
}
int add_class = Address.ClassOf(mb);
switch (add_class)
{
case AHAddress.ClassValue:
a = new AHAddress(mb);
break;
case DirectionalAddress.ClassValue:
a = new DirectionalAddress(mb);
break;
default:
a = null;
throw new ParseException("Unknown Address Class: " +
add_class + ", buffer:" +
mb.ToString());
}
//Cache this result:
_mb_cache[idx] = a;
return(a);
}
catch (ArgumentOutOfRangeException ex) {
throw new ParseException("Address too short: " +
mb.ToString(), ex);
}
catch (ArgumentException ex) {
throw new ParseException("Could not parse: " +
mb.ToString(), ex);
}
}
public void Test()
{
System.Random r = new System.Random();
for (int i = 0; i < 1024; i++)
{
//Test ClassOf and SetClass:
int c = r.Next(160);
byte[] buf0 = new byte[Address.MemSize];
//Fill it with junk
r.NextBytes(buf0);
Address.SetClass(buf0, c);
int c2 = Address.ClassOf(MemBlock.Reference(buf0, 0, Address.MemSize));
Assert.AreEqual(c, c2, "Class Round Trip");
//Test BigInteger stuff:
int size = r.Next(1, MemSize + 1);
byte[] buf1 = new byte[size];
r.NextBytes(buf1);
BigInteger b1 = new BigInteger(buf1);
byte[] buf2 = Address.ConvertToAddressBuffer(b1);
//Check to see if the bytes are equivalent:
int min_len = System.Math.Min(buf1.Length, buf2.Length);
bool all_eq = true;
for (int j = 0; j < min_len; j++)
{
all_eq = all_eq &&
(buf2[buf2.Length - j - 1] == buf1[buf1.Length - j - 1]);
}
if (!all_eq)
{
System.Console.Error.WriteLine("Buf1: ");
foreach (byte b in buf1)
{
System.Console.Write("{0} ", b);
}
System.Console.Error.WriteLine();
System.Console.Error.WriteLine("Buf2: ");
foreach (byte b in buf2)
{
System.Console.Write("{0} ", b);
}
System.Console.Error.WriteLine();
}
Assert.IsTrue(all_eq, "bytes are equivalent");
BigInteger b2 = new BigInteger(buf2);
Assert.AreEqual(b1, b2, "BigInteger round trip");
}
}