fix minor bugs

luprex/core/cpp/streambuffer.cpp

@@ -309,9 +309,8 @@ double StreamBuffer::read_double() {
 }
 
 void StreamBuffer::write_hashvalue(const util::HashValue &hv) {
-    make_space(16);
-    memcpy(write_cursor_, &hv, 16);
-    write_cursor_ += 16;
+    write_uint64(hv.first);
+    write_uint64(hv.second);
 }
 
 void StreamBuffer::write_string(const std::string &s) {
@@ -326,11 +325,9 @@ void StreamBuffer::write_string(const std::string &s) {
 }
 
 util::HashValue StreamBuffer::read_hashvalue() {
-    check_available(16);
-    util::HashValue hv;
-    memcpy(&hv, read_cursor_, 16);
-    read_cursor_ += 16;
-    return hv;
+    uint64_t f = read_uint64();
+    uint64_t s = read_uint64();
+    return util::HashValue(f,s);
 }
 
 std::string StreamBuffer::read_string() {
@@ -546,7 +543,7 @@ LuaDefine(unittests_streambuffer, "c") {
     try {
         sb11.read_bytes(1);
         LuaAssert(L, false && "This should have thrown an exception");
-    } catch (StreamEof) {}
+    } catch (const StreamEof &) {}
     LuaAssert(L, sb11.layout_is(6, 0, 5));
 
     // Write some more bytes into the stream, forcing a shift-left