/// <summary>
/// Returns the script bytes of inputScript with all instances of the specified script object removed
/// </summary>
/// <param name="inputScript"></param>
/// <param name="chunkToRemove"></param>
/// <returns></returns>
public static byte[] removeAllInstancesOf(byte[] inputScript,byte[] chunkToRemove)
{
// We usually don't end up removing anything
using(ByteStreamUnsafe stream=new ByteStreamUnsafe(inputScript.Length))
{
int cursor=0;
while(cursor<inputScript.Length)
{
bool skip=equalsRange(inputScript,cursor,chunkToRemove);
int opcode=inputScript[cursor++] & 0xFF;
int additionalBytes=0;
if(opcode>=0 && opcode<OP_PUSHDATA1)
{ additionalBytes=opcode; }
else if(opcode==OP_PUSHDATA1)
{ additionalBytes=inputScript[cursor]+1; }
else if(opcode==OP_PUSHDATA2)
{
additionalBytes=((0xFF & inputScript[cursor]) |
((0xFF & inputScript[cursor+1])<<8))
+2;
}
else if(opcode==OP_PUSHDATA4)
{
additionalBytes=((0xFF & inputScript[cursor]) |
((0xFF & inputScript[cursor+1])<<8) |
((0xFF & inputScript[cursor+1])<<16) |
((0xFF & inputScript[cursor+1])<<24))
+4;
}
if(!skip)
{
stream.Write((byte)opcode);
stream.Write(inputScript,cursor,additionalBytes);
}
cursor+=additionalBytes;
}
return stream.ToArrayIrreversible();
}
}
public static byte[] createOutputScript(Address to)
{
// TODO: Do this by creating a Script *first* then having the script reassemble itself into bytes.
using(ByteStreamUnsafe stream=new ByteStreamUnsafe(24))
{
stream.Write(OP_DUP);
stream.Write(OP_HASH160);
writeBytes(stream,to.Hash160);
stream.Write(OP_EQUALVERIFY);
stream.Write(OP_CHECKSIG);
return stream.ToArrayIrreversible();
}
}
/// <summary>
/// Create a script that sends coins directly to the given public key (eg in a coinbase transaction).
/// </summary>
/// <param name="pubkey"></param>
/// <returns></returns>
public static byte[] createOutputScript(byte[] pubkey)
{
// TODO: Do this by creating a Script *first* then having the script reassemble itself into bytes.
using(ByteStreamUnsafe stream=new ByteStreamUnsafe(pubkey.Length+1))
{
writeBytes(stream,pubkey);
stream.Write(OP_CHECKSIG);
return stream.ToArrayIrreversible();
}
}
public static byte[] createInputScript(byte[] signature)
{
// TODO: Do this by creating a Script *first* then having the script reassemble itself into bytes.
using(ByteStreamUnsafe stream=new ByteStreamUnsafe(signature.Length+2))
{
writeBytes(stream,signature);
return stream.ToArrayIrreversible();
}
}