redo packet build/parse

now with evbuffer

test/testev.cpp

@@ -9,10 +9,11 @@
 #include <epicsUnitTest.h>
 
 #include <pvxs/unittest.h>
+#include <pvxs/log.h>
 #include <evhelper.h>
 
-namespace  {
 using namespace pvxsimpl;
+namespace  {
 
 struct my_special_error : public std::runtime_error
 {
@@ -63,11 +64,58 @@ void test_call()
 
 }
 
+void test_fill_evbuf()
+{
+    testDiag("%s", __func__);
+
+    evbuf buf(evbuffer_new());
+
+    {
+        EvOutBuf M(true, buf.get());
+        testEq(M.size(), 0u);
+
+        for(uint32_t i : range(1024)) {
+            to_wire(M, i);
+        }
+        testDiag("Extra %u", unsigned(M.size()));
+        testOk1(!!M.good());
+
+        // ~EvOutBuf flushes to backing buf
+    }
+
+    testEq(evbuffer_get_length(buf.get()), 4*1024u);
+
+    {
+        EvInBuf M(true, buf.get());
+        testEq(M.size(), 0u);
+
+        bool match = true;
+        for(uint32_t expect : range(1024)) {
+            uint32_t actual=0;
+            from_wire(M, actual);
+            if(actual!=expect) {
+                testDiag("%08x == %08x", unsigned(expect), unsigned(actual));
+                match = false;
+                break; // only show first failure
+            }
+        }
+        testOk1(!!match);
+        testOk1(!!M.good());
+        testEq(M.size(), 0u);
+        testOk1(!M.refill(42)); // should be completely empty
+    }
+
+    testEq(evbuffer_get_length(buf.get()), 0u);
+}
+
 } // namespace
 
 MAIN(testev)
 {
-    testPlan(5);
+    testPlan(14);
     test_call();
+    test_fill_evbuf();
+    libevent_global_shutdown();
+    cleanup_for_valgrind();
     return testDone();
 }