Fix IND$FILE

j3270/src/main/java/haus/nightmare/j3270/ft/FileTransfer.java

@@ -121,6 +121,21 @@ public class FileTransfer implements FTCut.FTCutListener, FTDft.FTDftListener {
         if (state == FTState.RUNNING || state == FTState.AWAIT_ACK) {
             log.info("User cancelled transfer");
             setState(FTState.ABORT_WAIT); // Signal handlers to abort at next chance
+            // Start a safety timeout in case the host does not send further packets to trigger abort
+            cancelTimeout();
+            timeoutTimer = new Timer("FTCancelTimeout", true);
+            timeoutTimer.schedule(new TimerTask() {
+                @Override
+                public void run() {
+                    SwingUtilities.invokeLater(() -> {
+                        if (state != FTState.NONE) {
+                            log.warning("Transfer cancel timeout — force resetting state");
+                            completeTransfer("Transfer cancelled by user.");
+                            callback.onTransferAborted("Cancelled by user.");
+                        }
+                    });
+                }
+            }, 3000);
         } else if (state != FTState.NONE) {
             log.info("Forcing cancel from state " + state);
             completeTransfer("Transfer cancelled.");

lib3270j/src/main/java/haus/nightmare/lib3270j/ft/FTDft.java

@@ -106,6 +106,7 @@ public class FTDft {
         }
         dftSaveBuf = null;
         dftSaveBufLen = 0;
+        resetState();
     }
 
     /**
@@ -173,9 +174,9 @@ public class FTDft {
             nameBuf = extractName(data, sfOffset + 3 + 31, 7);
         }
 
-        if (OPEN_MSG.equalsIgnoreCase(nameBuf)) {
+        if (isMessageStream(nameBuf)) {
             messageFlag = true;
-            log.info("DFT: Open request for message stream");
+            log.info("DFT: Open request for message stream (" + nameBuf + ")");
         } else {
             messageFlag = false;
             listener.onDftRunning();
@@ -188,15 +189,36 @@ public class FTDft {
         dftOpenAck();
     }
 
+    private boolean isMessageStream(String name) {
+        if (name == null) return false;
+        String u = name.toUpperCase();
+        return u.contains(OPEN_MSG) || u.contains("MSG");
+    }
+
+    private boolean isDataStream(String name) {
+        if (name == null) return false;
+        String u = name.toUpperCase();
+        return u.contains("FT:DATA") || u.contains("DATA");
+    }
+
     private String extractName(byte[] data, int start, int maxLen) {
-        StringBuilder sb = new StringBuilder();
+        StringBuilder asciiSb = new StringBuilder();
+        StringBuilder ebcdicSb = new StringBuilder();
         for (int i = 0; i < maxLen && (start + i) < data.length; i++) {
             int b = data[start + i] & 0xFF;
             if (b == 0) break;
-            char ch = translator.ebcdicToUnicode(b);
-            sb.append(ch);
+            asciiSb.append((char) b);
+            ebcdicSb.append(translator.ebcdicToUnicode(b));
         }
-        return sb.toString().trim();
+        String ascii = asciiSb.toString().trim();
+        String ebcdic = ebcdicSb.toString().trim();
+        if (isMessageStream(ascii) || isDataStream(ascii)) {
+            return ascii;
+        }
+        if (isMessageStream(ebcdic) || isDataStream(ebcdic)) {
+            return ebcdic;
+        }
+        return ascii;
     }
 
     private void dftOpenAck() {
@@ -227,6 +249,7 @@ public class FTDft {
         int pos = offset + 2;
         int end = offset + length;
 
+        boolean dataFound = false;
         // Look for TR_BEGIN_DATA marker
         while (pos < end) {
             int headerCode = data[pos] & 0xFF;
@@ -234,10 +257,11 @@ public class FTDft {
             if (headerCode == TR_BEGIN_DATA) {
                 if (pos + 3 > end) break;
                 int dataLen = ((data[pos + 1] & 0xFF) << 8) | (data[pos + 2] & 0xFF);
-                int actualDataLen = dataLen - 3;
+                int actualDataLen = (dataLen > 5) ? Math.min(dataLen - 5, end - (pos + 3)) : (end - (pos + 3));
                 pos += 3;
 
                 if (actualDataLen > 0 && pos + actualDataLen <= end) {
+                    dataFound = true;
                     if (messageFlag) {
                         // Handle message payload from host
                         dftDataAck();
@@ -269,25 +293,46 @@ public class FTDft {
             }
         }
 
-        // Send acknowledgement for file data
-        dftDataAck();
+        // Send acknowledgement only if file data was actually received and processed
+        if (dataFound) {
+            dftDataAck();
+        }
     }
 
     private void handleHostMessage(byte[] data, int offset, int length) {
-        StringBuilder sb = new StringBuilder();
+        StringBuilder asciiSb = new StringBuilder();
+        StringBuilder ebcdicSb = new StringBuilder();
         for (int i = 0; i < length; i++) {
             int b = data[offset + i] & 0xFF;
             if (b == 0 || b == '$') break;
-            char ch = translator.ebcdicToUnicode(b);
-            sb.append(ch);
+            asciiSb.append((char) b);
+            ebcdicSb.append(translator.ebcdicToUnicode(b));
         }
-        String msg = sb.toString().trim();
-        log.info("DFT message: " + msg);
+        String asciiMsg = asciiSb.toString().trim();
+        String ebcdicMsg = ebcdicSb.toString().trim();
 
-        String msgLower = msg.toLowerCase();
-        if (msg.startsWith(END_TRANSFER) || msgLower.contains("complete") || msgLower.contains("transferred") || msgLower.contains("success")) {
+        // Determine if message is ASCII or EBCDIC
+        String msg = asciiMsg;
+        if (asciiMsg.toUpperCase().startsWith("TRANS") || asciiMsg.toLowerCase().contains("file") || asciiMsg.toLowerCase().contains("error")) {
+            msg = asciiMsg;
+        } else if (ebcdicMsg.toUpperCase().startsWith("TRANS") || ebcdicMsg.toLowerCase().contains("file") || ebcdicMsg.toLowerCase().contains("error")) {
+            msg = ebcdicMsg;
+        } else {
+            int asciiPrintable = 0;
+            for (char c : asciiMsg.toCharArray()) {
+                if (c >= 32 && c <= 126) asciiPrintable++;
+            }
+            if (asciiPrintable < asciiMsg.length() / 2 && !ebcdicMsg.isEmpty()) {
+                msg = ebcdicMsg;
+            }
+        }
+
+        log.info("DFT host message: " + msg);
+
+        String msgUpper = msg.toUpperCase();
+        if (msgUpper.startsWith(END_TRANSFER) || msgUpper.contains("COMPLETE") || msgUpper.contains("TRANSFERRED") || msgUpper.contains("SUCCESS")) {
             listener.onTransferComplete(null);
-        } else if (listener.getCurrentState() == FTState.ABORT_SENT || msgLower.contains("error") || msgLower.contains("failed") || msgLower.contains("abort")) {
+        } else if (msgUpper.startsWith("TRANS") || msgUpper.contains("ERROR") || msgUpper.contains("FAILED") || msgUpper.contains("ABORT") || msgUpper.contains("NOT FOUND") || listener.getCurrentState() == FTState.ABORT_SENT) {
             listener.onTransferAborted(msg.isEmpty() ? "Transfer aborted" : msg);
         } else {
             // Informational message (default success)
@@ -495,7 +540,7 @@ public class FTDft {
 
         input.sendStructuredFieldData(out.toByteArray());
 
-        if (!messageFlag) {
+        if (listener.getCurrentState() != FTState.NONE) {
             log.info("DFT: File transfer completed on close request (" + bytesTransferred + " bytes)");
             listener.onTransferComplete(null);
         }
@@ -504,13 +549,20 @@ public class FTDft {
     // ========== Data Acknowledgement ==========
 
     private void dftDataAck() {
-        ByteArrayOutputStream out = new ByteArrayOutputStream(6);
+        ByteArrayOutputStream out = new ByteArrayOutputStream(12);
         out.write(AID_SF);
-        out.write(0); out.write(5);
+        out.write(0); out.write(11); // SF length = 11 (0x000B)
         out.write(SF_TRANSFER_DATA);
         out.write((TR_NORMAL_REPLY >> 8) & 0xFF);
         out.write(TR_NORMAL_REPLY & 0xFF);
+        out.write((TR_RECNUM_HDR >> 8) & 0xFF);
+        out.write(TR_RECNUM_HDR & 0xFF);
+        out.write((int) ((recnum >> 24) & 0xFF));
+        out.write((int) ((recnum >> 16) & 0xFF));
+        out.write((int) ((recnum >> 8) & 0xFF));
+        out.write((int) (recnum & 0xFF));
 
+        recnum++;
         input.sendStructuredFieldData(out.toByteArray());
     }
 

lib3270j/src/main/java/haus/nightmare/lib3270j/input/InputProcessor.java

@@ -780,7 +780,9 @@ public class InputProcessor {
      * Used by DFT mode file transfer.
      */
     public void sendStructuredFieldData(byte[] data) {
-        fsm.send3270Data(data);
+        if (fsm != null) {
+            fsm.send3270Data(data);
+        }
     }
 
     /** Get a reference to the TelnetFSM for direct SF operations. */

test_all.sh

@@ -43,6 +43,7 @@ fi
 BUILD_DIR="$SCRIPT_DIR/build"
 TEST_BUILD_DIR="$BUILD_DIR/test-classes"
 REPORTS_DIR="$BUILD_DIR/reports/tests"
+rm -rf "$TEST_BUILD_DIR"
 mkdir -p "$TEST_BUILD_DIR" "$REPORTS_DIR"
 
 # 3. Ensure JUnit standalone runner is present