Adds a QuicUtil::HexDump method that provides better debug output of binary data.

net/quic/quic_utils_test.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_utils.h"
 
 #include "net/quic/crypto/crypto_protocol.h"
 #include "net/quic/quic_flags.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 167 matching lines @@
 TEST(QuicUtilsHashTest, ReferenceTest) {
   std::vector<uint8_t> data(32);
   for (size_t i = 0; i < data.size(); ++i) {
     data[i] = i % 255;
   }
   EXPECT_EQ(IncrementalHashReference(data.data(), data.size()),
             QuicUtils::FNV1a_128_Hash(
                 reinterpret_cast<const char*>(data.data()), data.size()));
 }
 
+TEST(QuicUtilsTest, HexDump) {
+  // Verify output of the HexDump method is as expected.
+  char packet[] = {
+      0x48, 0x65, 0x6c, 0x6c, 0x6f, 0x2c, 0x20, 0x51, 0x55, 0x49, 0x43, 0x21,
+      0x20, 0x54, 0x68, 0x69, 0x73, 0x20, 0x73, 0x74, 0x72, 0x69, 0x6e, 0x67,
+      0x20, 0x73, 0x68, 0x6f, 0x75, 0x6c, 0x64, 0x20, 0x62, 0x65, 0x20, 0x6c,
+      0x6f, 0x6e, 0x67, 0x20, 0x65, 0x6e, 0x6f, 0x75, 0x67, 0x68, 0x20, 0x74,
+      0x6f, 0x20, 0x73, 0x70, 0x61, 0x6e, 0x20, 0x6d, 0x75, 0x6c, 0x74, 0x69,
+      0x70, 0x6c, 0x65, 0x20, 0x6c, 0x69, 0x6e, 0x65, 0x73, 0x20, 0x6f, 0x66,
+      0x20, 0x6f, 0x75, 0x74, 0x70, 0x75, 0x74, 0x2e, 0x01, 0x02, 0x03, 0x00,
+  };
+  EXPECT_EQ(
+      QuicUtils::HexDump(packet),
+      "48 65 6C 6C 6F 2C 20 51 55 49 43 21 20 54 68 69  |Hello, QUIC! Thi|\n"
+      "73 20 73 74 72 69 6E 67 20 73 68 6F 75 6C 64 20  |s string should |\n"
+      "62 65 20 6C 6F 6E 67 20 65 6E 6F 75 67 68 20 74  |be long enough t|\n"
+      "6F 20 73 70 61 6E 20 6D 75 6C 74 69 70 6C 65 20  |o span multiple |\n"
+      "6C 69 6E 65 73 20 6F 66 20 6F 75 74 70 75 74 2E  |lines of output.|\n"
+      "01 02 03                                         |...             |\n");
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace net