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Merge pull request #416 from chritchens/core 

Add nulldata builder and fix op_return script push
This commit is contained in:
Marek Kotewicz 2017-05-26 12:18:09 +02:00 committed by GitHub
parent 5485f51a67 e6958468c3
commit f1ce9902e8
1 changed files with 17 additions and 0 deletions
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17
script/src/builder.rs
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@ -31,6 +31,14 @@ impl Builder {
.into_script()
}
/// Builds op_return script
pub fn build_nulldata(bytes: &[u8]) -> Script {
Builder::default()
.push_opcode(Opcode::OP_RETURN)
.push_bytes(bytes)
.into_script()
}
/// Pushes opcode to the end of script
pub fn push_opcode(mut self, opcode: Opcode) -> Self {
self.data.push(opcode as u8);
@ -94,7 +102,16 @@ impl Builder {
/// Appends `OP_RETURN` operation to the end of script
pub fn return_bytes(mut self, bytes: &[u8]) -> Self {
let len = bytes.len();
if len < 1 || len > 75 {
panic!(format!("Canot push {} bytes", len));
}
let opcode: Opcode = Opcode::from_u8(((Opcode::OP_PUSHBYTES_1 as usize) + len - 1) as u8)
.expect("value is within [OP_PUSHBYTES_1; OP_PUSHBYTES_75] interval; qed");
self.data.push(Opcode::OP_RETURN as u8);
self.data.push(opcode as u8);
self.data.extend_from_slice(bytes);
self
}