change counter variable type and add exception description comment

Author: gaya-cohen

include/tins/exceptions.h

@@ -66,6 +66,9 @@ class malformed_packet : public exception_base {
     malformed_packet() : exception_base("Malformed packet") { }
 };
 
+/**
+ * \brief Exception thrown when a DNS decompression pointer is out of bounds.
+ */
 class DNS_decompression_pointer_out_of_bounds : public exception_base {
 public:
     DNS_decompression_pointer_out_of_bounds() : exception_base("DNS decompression pointer out of bounds") { }

src/dns.cpp

@@ -336,7 +336,7 @@ uint32_t DNS::compose_name(const uint8_t* ptr, char* out_ptr) const {
     const uint8_t* end = &records_data_[0] + records_data_.size();
     const uint8_t* end_ptr = 0;
     char* current_out_ptr = out_ptr;
-    int pointer_counter = 0;
+    uint8_t pointer_counter = 0;
     while (*ptr) {
         if (pointer_counter++ > 30){
             throw DNS_decompression_pointer_loops();