From 3bf56e7248e9bc548866eff5161d122fdcd6f7c6 Mon Sep 17 00:00:00 2001
From: ImBenji <benjamin.watt@imbenji.net>
Date: Fri, 29 Aug 2025 15:55:21 +0100
Subject: [PATCH] Fix string bounds error in payload analysis fallback
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Fixes RangeError when ASCII sample is shorter than 100 characters by checking length before substring.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 lib/services/protocol_blocking_service.dart | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/services/protocol_blocking_service.dart b/lib/services/protocol_blocking_service.dart
index 55d76c8..9df0efb 100644
--- a/lib/services/protocol_blocking_service.dart
+++ b/lib/services/protocol_blocking_service.dart
@@ -234,7 +234,9 @@ class ProtocolBlockingService {
     final asciiData = _extractAsciiFromHex(hexBytes);
     final hexString = hexBytes.join('').toLowerCase();
     
-    print('🔤 ASCII sample: ${asciiData.replaceAll(RegExp(r'[^\x20-\x7E]'), '.').substring(0, 100)}...');
+    final cleanAscii = asciiData.replaceAll(RegExp(r'[^\x20-\x7E]'), '.');
+    final sampleLength = cleanAscii.length < 100 ? cleanAscii.length : 100;
+    print('🔤 ASCII sample: ${cleanAscii.substring(0, sampleLength)}${cleanAscii.length > 100 ? '...' : ''}');
     
     String? detectedProtocol;