1 files changed, 121 insertions, 0 deletions
diff --git a/src/seastar/tests/unit/packet_test.cc b/src/seastar/tests/unit/packet_test.cc
new file mode 100644
index 000000000..a0bdd291e
--- /dev/null
+++ b/src/seastar/tests/unit/packet_test.cc
@@ -0,0 +1,121 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+/*
+ * Copyright (C) 2015 Cloudius Systems, Ltd.
+ */
+
+
+#define BOOST_TEST_MODULE core
+
+#include <boost/test/included/unit_test.hpp>
+#include <seastar/net/packet.hh>
+#include <array>
+
+using namespace seastar;
+using namespace net;
+
+BOOST_AUTO_TEST_CASE(test_many_fragments) {
+    std::vector<char> expected;
+
+    auto append = [&expected] (net::packet p, char c, size_t n) {
+        auto tmp = temporary_buffer<char>(n);
+        std::fill_n(tmp.get_write(), n, c);
+        std::fill_n(std::back_inserter(expected), n, c);
+        return net::packet(std::move(p), std::move(tmp));
+    };
+
+    net::packet p;
+    p = append(std::move(p), 'a', 5);
+    p = append(std::move(p), 'b', 31);
+    p = append(std::move(p), 'c', 65);
+    p = append(std::move(p), 'c', 4096);
+    p = append(std::move(p), 'd', 4096);
+
+    auto verify = [&expected] (const net::packet& p) {
+        BOOST_CHECK_EQUAL(p.len(), expected.size());
+        auto expected_it = expected.begin();
+        for (auto&& frag : p.fragments()) {
+            BOOST_CHECK_LE(frag.size, static_cast<size_t>(expected.end() - expected_it));
+            BOOST_CHECK(std::equal(frag.base, frag.base + frag.size, expected_it));
+            expected_it += frag.size;
+        }
+    };
+
+    auto trim_front = [&expected] (net::packet& p, size_t n) {
+        p.trim_front(n);
+        expected.erase(expected.begin(), expected.begin() + n);
+    };
+
+    verify(p);
+
+    trim_front(p, 1);
+    verify(p);
+
+    trim_front(p, 6);
+    verify(p);
+
+    trim_front(p, 29);
+    verify(p);
+
+    trim_front(p, 1024);
+    verify(p);
+
+    net::packet p2;
+    p2 = append(std::move(p2), 'z', 9);
+    p2 = append(std::move(p2), 'x', 7);
+
+    p.append(std::move(p2));
+    verify(p);
+}
+
+BOOST_AUTO_TEST_CASE(test_headers_are_contiguous) {
+    using tcp_header = std::array<char, 20>;
+    using ip_header = std::array<char, 20>;
+    char data[1000] = {};
+    fragment f{data, sizeof(data)};
+    packet p(f);
+    p.prepend_header<tcp_header>();
+    p.prepend_header<ip_header>();
+    BOOST_REQUIRE_EQUAL(p.nr_frags(), 2u);
+}
+
+BOOST_AUTO_TEST_CASE(test_headers_are_contiguous_even_with_small_fragment) {
+    using tcp_header = std::array<char, 20>;
+    using ip_header = std::array<char, 20>;
+    char data[100] = {};
+    fragment f{data, sizeof(data)};
+    packet p(f);
+    p.prepend_header<tcp_header>();
+    p.prepend_header<ip_header>();
+    BOOST_REQUIRE_EQUAL(p.nr_frags(), 2u);
+}
+
+BOOST_AUTO_TEST_CASE(test_headers_are_contiguous_even_with_many_fragments) {
+    using tcp_header = std::array<char, 20>;
+    using ip_header = std::array<char, 20>;
+    char data[100] = {};
+    fragment f{data, sizeof(data)};
+    packet p(f);
+    for (int i = 0; i < 7; ++i) {
+        p.append(packet(f));
+    }
+    p.prepend_header<tcp_header>();
+    p.prepend_header<ip_header>();
+    BOOST_REQUIRE_EQUAL(p.nr_frags(), 9u);
+}
+