1 files changed, 3 insertions, 1 deletions
diff --git a/ByteBuffer.cpp b/ByteBuffer.cpp
index 912e697..f27deeb 100644
--- a/ByteBuffer.cpp
+++ b/ByteBuffer.cpp
@@ -3,11 +3,13 @@
 #include <string.h>
 #include <sstream>
 #include <iomanip>
+#include <cassert>
 
 using namespace std;
 
 ByteBuffer::ByteBuffer(uint8_t *bytes, size_t capacity, size_t size, size_t zero) :
         bytes(bytes), capacity(capacity), size(size), cursor(zero), zero(zero) {
+    assert(zero <= size);
 }
 
 ByteBuffer &ByteBuffer::add8(uint8_t value) {
@@ -73,7 +75,7 @@ std::string ByteBuffer::toString() const {
     stringstream s;
 
     for(size_t i = zero; i < size; i++) {
-        s << hex << setfill('0') << setw(2) << bytes[i] << " ";
+        s << hex << setfill('0') << setw(2) << (int) bytes[i] << " ";
     }
 
     return string(s.str());