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better maxSize calculation.

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This commit is contained in:
Christopher Jeffrey 2016-03-31 05:44:45 -07:00
parent 3242f39972
commit 6c69914da5
1 changed files with 31 additions and 15 deletions
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46
lib/bcoin/mtx.js
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@ -684,21 +684,37 @@ MTX.prototype.scriptOutput = function scriptOutput(index, options) {
output.script = Script.createOutputScript(options);
};
MTX.prototype.maxSize = function maxSize(maxM, maxN) {
var copy = this.clone();
MTX.prototype.isScripted = function isScripted() {
if (this.inputs.length === 0)
return false;
if (this.outputs.length === 0)
return false;
return this.inputs.every(function(input) {
return input.script.code.length > 0 || input.witness.items.length > 0;
});
};
MTX.prototype.maxSize = function maxSize(maxM, maxN, force) {
var i, j, input, total, size, prev, m, n, witness;
// Create copy with 0-script inputs
for (i = 0; i < copy.inputs.length; i++) {
copy.inputs[i].script = new Script([]);
copy.inputs[i].witness = new Witness([]);
if (!force && this.isScripted())
return this.getVirtualSize();
// Calculate the size, minus the input scripts.
total = bcoin.protocol.framer.tx.size(this);
for (i = 0; i < this.inputs.length; i++) {
input = this.inputs[i];
size = input.script.getSize();
total -= utils.sizeVarint(size) + size;
total += 1;
}
total = bcoin.protocol.framer.tx.size(copy);
// Add size for signatures and public keys
for (i = 0; i < copy.inputs.length; i++) {
input = copy.inputs[i];
for (i = 0; i < this.inputs.length; i++) {
input = this.inputs[i];
size = 0;
witness = false;
@ -712,12 +728,12 @@ MTX.prototype.maxSize = function maxSize(maxM, maxN) {
// If we have access to the redeem script,
// we can use it to calculate size much easier.
if (this.inputs[i].script.code.length && prev.isScripthash()) {
if (input.script.code.length && prev.isScripthash()) {
// Need to add the redeem script size
// here since it will be ignored by
// the isMultisig clause.
// OP_PUSHDATA2 [redeem]
prev = this.inputs[i].script.getRedeem();
prev = input.script.getRedeem();
size += 3 + prev.getSize();
}
@ -727,8 +743,8 @@ MTX.prototype.maxSize = function maxSize(maxM, maxN) {
// redeem script (if there was one)
// is now worth 4 points.
size *= 4;
if (this.inputs[i].witness.items.length && prev.isWitnessScripthash()) {
prev = this.inputs[i].witness.getRedeem();
if (input.witness.items.length && prev.isWitnessScripthash()) {
prev = input.witness.getRedeem();
size += 3 + prev.getSize();
} else if (prev.isWitnessPubkeyhash()) {
prev = Script.createPubkeyhash(prev.code[1]);
@ -889,7 +905,7 @@ MTX.prototype.selectCoins = function selectCoins(coins, options) {
// bytes (10000 satoshi for every 1024 bytes).
do {
// Calculate max possible size after signing.
size = tx.maxSize(options.m, options.n);
size = tx.maxSize(options.m, options.n, true);
if (tryFree) {
if (tx.isFree(network.height + 1, size)) {