data prefix added to key images and outputs checkers

src/page.h

@@ -2334,6 +2334,10 @@ public:
 
         const size_t magiclen = strlen(KEY_IMAGE_EXPORT_FILE_MAGIC);
 
+        string data_prefix = xmreg::make_printable(decoded_raw_data.substr(0, magiclen));
+
+        context["data_prefix"] = data_prefix;
+
         if (!strncmp(decoded_raw_data.c_str(), KEY_IMAGE_EXPORT_FILE_MAGIC, magiclen) == 0)
         {
             string error_msg = fmt::format("This does not seem to be key image export data.");
@@ -2689,6 +2693,10 @@ public:
 
         const size_t magiclen = strlen(OUTPUT_EXPORT_FILE_MAGIC);
 
+        string data_prefix = xmreg::make_printable(decoded_raw_data.substr(0, magiclen));
+
+        context["data_prefix"] = data_prefix;
+
         if (!strncmp(decoded_raw_data.c_str(), OUTPUT_EXPORT_FILE_MAGIC, magiclen) == 0)
         {
             string error_msg = fmt::format("This does not seem to be output keys export data.");

src/templates/checkrawkeyimgs.html

@@ -22,6 +22,8 @@
     </div>
 
 
+    <h3>Data file prefix: {{data_prefix}}</h3>
+
     {{#has_error}}
         <h4 style="color:red">Attempt failed</h4>
         <h4>{{error_msg}}</h4>

src/templates/checkrawoutputkeys.html

@@ -21,6 +21,7 @@
         <h4 style="font-size: 15px; margin: 0px">(no javascript - no cookies - no web analytics trackers - no images - open sourced)</h4>
     </div>
 
+    <h3>Data file prefix: {{data_prefix}}</h3>
 
     {{#has_error}}
         <h4 style="color:red">Attempt failed</h4>