Refactor address lookups

src/mainwindow.cpp

@@ -1082,7 +1082,7 @@ void MainWindow::setupBalancesTab() {
             fnDoSendFrom(addr);
         });
 
-        if (addr.startsWith("t")) {
+        if (Settings::isTAddress(addr)) {
             auto defaultSapling = rpc->getDefaultSaplingAddress();
             if (!defaultSapling.isEmpty()) {
                 menu.addAction(tr("Shield balance to Sapling"), [=] () {
@@ -1402,7 +1402,7 @@ void MainWindow::updateTAddrCombo(bool checked) {
 
         std::for_each(utxos->begin(), utxos->end(), [=](auto& utxo) {
             auto addr = utxo.address;
-            if (addr.startsWith("t") && ui->listRecieveAddresses->findText(addr) < 0) {
+            if (Settings::isTAddress(addr) && ui->listRecieveAddresses->findText(addr) < 0) {
                 auto bal = rpc->getAllBalances()->value(addr);
                 ui->listRecieveAddresses->addItem(addr, bal);
             }

src/rpc.cpp

@@ -355,7 +355,7 @@ void RPC::fillTxJsonParams(json& params, Tx tx) {
         // Force it through string for rounding. Without this, decimal points beyond 8 places
         // will appear, causing an "invalid amount" error
         rec["amount"]       = Settings::getDecimalString(toAddr.amount).toStdString(); //.toDouble(); 
-        if (toAddr.addr.startsWith("z") && !toAddr.encodedMemo.trimmed().isEmpty())
+        if (Settings::isZAddress(toAddr.addr) && !toAddr.encodedMemo.trimmed().isEmpty())
             rec["memo"]     = toAddr.encodedMemo.toStdString();
 
         allRecepients.push_back(rec);

src/sendtab.cpp

@@ -292,7 +292,7 @@ void MainWindow::addAddressSection() {
 
 void MainWindow::addressChanged(int itemNumber, const QString& text) {   
     auto addr = AddressBook::addressFromAddressLabel(text);
-    setMemoEnabled(itemNumber, addr.startsWith("z"));
+    setMemoEnabled(itemNumber, Settings::isZAddress(addr));
 }
 
 void MainWindow::amountChanged(int item, const QString& text) {
@@ -314,7 +314,7 @@ void MainWindow::setMemoEnabled(int number, bool enabled) {
 void MainWindow::memoButtonClicked(int number, bool includeReplyTo) {
     // Memos can only be used with zAddrs. So check that first
     auto addr = ui->sendToWidgets->findChild<QLineEdit*>(QString("Address") + QString::number(number));
-    if (!AddressBook::addressFromAddressLabel(addr->text()).startsWith("z")) {
+    if (! Settings::isZAddress(AddressBook::addressFromAddressLabel(addr->text()))) {
         QMessageBox msg(QMessageBox::Critical, tr("Memos can only be used with z-addresses"),
         tr("The memo field can only be used with a z-address.\n") + addr->text() + tr("\ndoesn't look like a z-address"),
         QMessageBox::Ok, this);
@@ -500,7 +500,7 @@ Tx MainWindow::createTxFromSendPage() {
 
 bool MainWindow::confirmTx(Tx tx) {
     auto fnSplitAddressForWrap = [=] (const QString& a) -> QString {
-        if (!a.startsWith("z")) return a;
+        if (! Settings::isZAddress(a)) return a;
 
         auto half = a.length() / 2;
         auto splitted = a.left(half) + "\n" + a.right(a.length() - half);
@@ -566,7 +566,7 @@ bool MainWindow::confirmTx(Tx tx) {
             confirm.gridLayout->addWidget(AmtUSD, row, 2, 1, 1);            
 
             // Memo
-            if (toAddr.addr.startsWith("z") && !toAddr.txtMemo.isEmpty()) {
+            if (Settings::isZAddress(toAddr.addr) && !toAddr.txtMemo.isEmpty()) {
                 row++;
                 auto Memo = new QLabel(confirm.sendToAddrs);
                 Memo->setObjectName(QStringLiteral("Memo") % QString::number(i + 1));

src/senttxstore.cpp

@@ -57,7 +57,7 @@ void SentTxStore::addToSentTx(Tx tx, QString txid) {
 
     // Also, only store outgoing txs where the from address is a z-Addr. Else, regular zcashd 
     // stores it just fine
-    if (!tx.fromAddr.startsWith("z")) 
+    if (! Settings::isZAddress(tx.fromAddr)) 
         return;
 
     QFile data(writeableFile());