/// <summary>
/// Copies 2 items from stack to top of the stack like this: x1 x2 x3 x4 -> x1 x2 x3 x4 x1 x2
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 4)
{
error = Err.OpNotEnoughItems;
return(false);
}
byte[] data1 = opData.PeekAtIndex(3);
byte[] data2 = opData.PeekAtIndex(2);
opData.Push(new byte[2][] { data1, data2 });
return(CheckItemCount(opData, out error));
}
/// <summary>
/// Copies 2 items from stack to top of the stack like this: x1 x2 x3 x4 -> x1 x2 x3 x4 x1 x2
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 4)
{
error = "There was not enough items left in the stack to copy over.";
return(false);
}
byte[] data1 = opData.PeekAtIndex(3);
byte[] data2 = opData.PeekAtIndex(2);
opData.Push(new byte[2][] { data1, data2 });
error = null;
return(true);
}
/// <summary>
/// Copies the second item from top of the stack to the top. Return value indicates success.
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 2)
{
error = Err.OpNotEnoughItems;
return(false);
}
byte[] data = opData.PeekAtIndex(1);
opData.Push(data);
return(CheckItemCount(opData, out error));
}
/// <summary>
/// Copies the second item from top of the stack to the top. Return value indicates success.
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 2)
{
error = "There was not enough items left in the stack to copy over.";
return(false);
}
byte[] data = opData.PeekAtIndex(1);
opData.Push(data);
error = null;
return(true);
}
/// <summary>
/// Copies the nth item from top of the stack to the top. Return value indicates success.
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
// At least 2 items is needed. 1 telling us the index and the other is the item to copy
if (opData.ItemCount < 2)
{
error = Err.OpNotEnoughItems;
return(false);
}
byte[] data = opData.Pop();
// Initial test to reject any huge numbers
if (data.Length > 4)
{
error = "'n' is too big.";
return(false);
}
if (!TryConvertToLong(data, out long n, true)) // TODO: set isStrict field based on BIP62
{
error = "Invalid number format.";
return(false);
}
if (n < 0)
{
error = "'n' can not be negative.";
return(false);
}
// 'n' is index so it can't be equal to ItemCount
if (opData.ItemCount <= n)
{
error = Err.OpNotEnoughItems;
return(false);
}
opData.Push(opData.PeekAtIndex((int)n));
error = null;
return(true);
}
/// <summary>
/// Copies the nth item from top of the stack to the top. Return value indicates success.
/// </summary>
/// <param name="opData">Data to use</param>
/// <param name="error">Error message (null if sucessful, otherwise will contain information about the failure)</param>
/// <returns>True if operation was successful, false if otherwise</returns>
public override bool Run(IOpData opData, out string error)
{
if (opData.ItemCount < 2) // At least 2 items is needed. 1 telling us the index and the other to copy
{
error = "There was not enough items left in the stack to copy to top.";
return(false);
}
byte[] data = opData.Pop();
if (data.Length > 4) // Initial test to reject any huge numbers
{
error = "'n' is too big.";
return(false);
}
if (!OpHelper.TryConvertByteArrayToInt(data, out long n, true)) // TODO: set isStrict field base don BIP62
{
error = "Invalid number format.";
return(false);
}
if (n < 0)
{
error = "'n' can not be negative.";
return(false);
}
if (opData.ItemCount <= n) // 'n' is index so it can't be equal to ItemCount
{
error = "There was not enough items left in the stack to copy to top.";
return(false);
}
opData.Push(opData.PeekAtIndex((int)n));
error = null;
return(true);
}