///<summary>The result of applying this hash function to the given data, by interpreting the operations in the inner loop.</summary>
public int Interpret(IntStream data)
{
// copy initial state
var state = InitialState.ToArray();
var buffer = new int[1 << 12];
while (true) {
var n = data.Read(buffer);
if (n == 0) break;
// feed data through the state via custom steps
for (var i = 0; i < n; i++) {
// input into hash via first state variable
state[0] = buffer[i];
// apply custom hashing steps
foreach (var step in Steps) {
// read
var lhs = state[step.LeftInputIndex];
var rhs = state[step.RightInputIndex];
// eval
int result;
switch (step.Operation) {
case Operation.Add:
unchecked {
result = lhs + rhs;
}
break;
case Operation.Multiply:
unchecked {
result = lhs*rhs;
}
break;
case Operation.Subtract:
unchecked {
result = lhs - rhs;
}
break;
case Operation.Xor:
result = lhs ^ rhs;
break;
case Operation.Or:
result = lhs | rhs;
break;
case Operation.And:
result = lhs & rhs;
break;
default:
throw new InvalidOperationException();
}
// write
state[step.OutputIndex] = result;
}
}
}
// result is last state variable
return state[state.Length - 1];
}
/// <summary>
/// The function generated by specializing the hash function returned by Example.
/// Obtained by:
/// 1. Evaluating Specialize to get the expression representing the method.
/// 2. Passing the method expression to WriteMethodToAssembly (below) to get an assembly.
/// 3. Decompiling the assembly (with a tool like reflector).
/// </summary>
public static int SpecializedExampleFunction(IntStream stream1)
{
var num2 = 0;
var num3 = 0x1a730b3b;
var num4 = 0x13d66648;
var num5 = 0x3e0c5f92;
var buffer = new[] { 0x1000 };
while (true)
{
var num = stream1.Read(buffer);
if (num == 0)
{
return(num5);
}
var num6 = 0;
while (num6 < num)
{
var index = num6;
num6 = index + 1;
num2 = buffer[index];
num3 ^= num2;
num4 -= num5;
num5 ^= num3;
num3 += num4;
}
}
}
///<summary>The result of applying this hash function to the given data, by interpreting the operations in the inner loop.</summary>
public int Interpret(IntStream data)
{
// copy initial state
var state = InitialState.ToArray();
var buffer = new int[1 << 12];
while (true)
{
var n = data.Read(buffer);
if (n == 0)
{
break;
}
// feed data through the state via custom steps
for (var i = 0; i < n; i++)
{
// input into hash via first state variable
state[0] = buffer[i];
// apply custom hashing steps
foreach (var step in Steps)
{
// read
var lhs = state[step.LeftInputIndex];
var rhs = state[step.RightInputIndex];
// eval
int result;
switch (step.Operation)
{
case Operation.Add:
unchecked {
result = lhs + rhs;
}
break;
case Operation.Multiply:
unchecked {
result = lhs * rhs;
}
break;
case Operation.Subtract:
unchecked {
result = lhs - rhs;
}
break;
case Operation.Xor:
result = lhs ^ rhs;
break;
case Operation.Or:
result = lhs | rhs;
break;
case Operation.And:
result = lhs & rhs;
break;
default:
throw new InvalidOperationException();
}
// write
state[step.OutputIndex] = result;
}
}
}
// result is last state variable
return(state[state.Length - 1]);
}
