tracing v2: Add proto_utils.h

components/tracing/core/proto_utils_unittest.cc

+// Copyright 2016 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 "components/tracing/core/proto_utils.h"
+
+#include "base/logging.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace tracing {
+namespace v2 {
+namespace proto {
+namespace {
+
+bool VarIntHelperU32(const char* expected, size_t length, uint32_t value) {
+  uint8_t buf[32];
+  uint8_t* res = WriteVarIntU32(value, buf);
+  if (static_cast<size_t>(res - buf) != length)
+    return false;
+  if (memcmp(expected, buf, length))
+    return false;
+  return true;
+}
+
+bool VarIntHelperU64(const char* expected, size_t length, uint64_t value) {
+  uint8_t buf[32];
+  uint8_t* res = WriteVarIntU64(value, buf);
+  if (static_cast<size_t>(res - buf) != length)
+    return false;
+  if (memcmp(expected, buf, length))
+    return false;
+  return true;
+}
+
+#define EXPECT_VARINT32_EQ(expected, expected_length, value) \
+  EXPECT_PRED3(VarIntHelperU32, expected, expected_length, value)
+
+#define EXPECT_VARINT64_EQ(expected, expected_length, value) \
+  EXPECT_PRED3(VarIntHelperU64, expected, expected_length, value)
+
+TEST(ProtoUtilsTest, Serialization) {
+  EXPECT_EQ(0x08u, MakeTagVarInt(1));
+  EXPECT_EQ(0x09u, MakeTagFixed64(1));
+  EXPECT_EQ(0x0Au, MakeTagLengthLimited(1));
+  EXPECT_EQ(0x0Du, MakeTagFixed32(1));
+
+  EXPECT_EQ(0x03F8u, MakeTagVarInt(0x7F));
+  EXPECT_EQ(0x03F9u, MakeTagFixed64(0x7F));
+  EXPECT_EQ(0x03FAu, MakeTagLengthLimited(0x7F));
+  EXPECT_EQ(0x03FDu, MakeTagFixed32(0x7F));
+
+  EXPECT_EQ(0x0400u, MakeTagVarInt(0x80));
+  EXPECT_EQ(0x0401u, MakeTagFixed64(0x80));
+  EXPECT_EQ(0x0402u, MakeTagLengthLimited(0x80));
+  EXPECT_EQ(0x0405u, MakeTagFixed32(0x80));
+
+  EXPECT_EQ(0x01FFF8u, MakeTagVarInt(0x3fff));
+  EXPECT_EQ(0x01FFF9u, MakeTagFixed64(0x3fff));
+  EXPECT_EQ(0x01FFFAu, MakeTagLengthLimited(0x3fff));
+  EXPECT_EQ(0x01FFFDu, MakeTagFixed32(0x3fff));
+
+  EXPECT_EQ(0x020000u, MakeTagVarInt(0x4000));
+  EXPECT_EQ(0x020001u, MakeTagFixed64(0x4000));
+  EXPECT_EQ(0x020002u, MakeTagLengthLimited(0x4000));
+  EXPECT_EQ(0x020005u, MakeTagFixed32(0x4000));
+
+  EXPECT_VARINT32_EQ("\x00", 1, 0);

[alph, 2016/07/06 17:29:52]

nit: you can drop the length arg and infer it from the expected value.

[Primiano Tucci (use gerrit), 2016/07/07 12:59:25]

you mean using strlen? The problem is this case here where I have "\x00" where
strlen would return 0 and not 1.

+  EXPECT_VARINT32_EQ("\x00", 1, 0);
+  EXPECT_VARINT32_EQ("\x01", 1, 0x1);
+  EXPECT_VARINT32_EQ("\x7f", 1, 0x7F);
+  EXPECT_VARINT32_EQ("\xFF\x01", 2, 0xFF);
+  EXPECT_VARINT32_EQ("\xFF\x7F", 2, 0x3FFF);
+  EXPECT_VARINT32_EQ("\x80\x80\x01", 3, 0x4000);
+  EXPECT_VARINT32_EQ("\xFF\xFF\x7F", 3, 0x1FFFFF);
+  EXPECT_VARINT32_EQ("\x80\x80\x80\x01", 4, 0x200000);
+  EXPECT_VARINT32_EQ("\xFF\xFF\xFF\x7F", 4, 0xFFFFFFF);
+  EXPECT_VARINT32_EQ("\x80\x80\x80\x80\x01", 5, 0x10000000);
+  EXPECT_VARINT32_EQ("\xFF\xFF\xFF\xFF\x0F", 5, 0xFFFFFFFF);
+
+  EXPECT_VARINT64_EQ("\x00", 1, 0);
+  EXPECT_VARINT64_EQ("\x01", 1, 0x1);
+  EXPECT_VARINT64_EQ("\x7f", 1, 0x7F);
+  EXPECT_VARINT64_EQ("\xFF\x01", 2, 0xFF);
+  EXPECT_VARINT64_EQ("\xFF\x7F", 2, 0x3FFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x01", 3, 0x4000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\x7F", 3, 0x1FFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x01", 4, 0x200000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\x7F", 4, 0xFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x01", 5, 0x10000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\x0F", 5, 0xFFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x10", 5, 0x100000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\x7F", 5, 0x7FFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x80\x01", 6, 0x800000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\x7F", 6, 0x3FFFFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x80\x80\x01", 7, 0x40000000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 7, 0x1FFFFFFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x80\x80\x80\x01", 8, 0x2000000000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 8, 0xFFFFFFFFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x80\x80\x80\x80\x01", 9,
+                     0x100000000000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 9,
+                     0x7FFFFFFFFFFFFFFF);
+  EXPECT_VARINT64_EQ("\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01", 10,
+                     0x8000000000000000);
+  EXPECT_VARINT64_EQ("\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x01", 10,
+                     0xFFFFFFFFFFFFFFFF);
+
+  uint8_t buf[4];
+
+  WriteRedundantVarIntUnsigned(0, sizeof(buf), buf);
+  EXPECT_EQ(0, memcmp("\x80\x80\x80\x00", buf, sizeof(buf)));
+
+  WriteRedundantVarIntUnsigned(1, sizeof(buf), buf);
+  EXPECT_EQ(0, memcmp("\x81\x80\x80\x00", buf, sizeof(buf)));
+
+  WriteRedundantVarIntUnsigned(0x80, sizeof(buf), buf);
+  EXPECT_EQ(0, memcmp("\x80\x81\x80\x00", buf, sizeof(buf)));
+
+  WriteRedundantVarIntUnsigned(0x332211, sizeof(buf), buf);
+  EXPECT_EQ(0, memcmp("\x91\xC4\xCC\x01", buf, sizeof(buf)));
+}
+
+}  // namespace
+}  // namespace proto
+}  // namespace v2
+}  // namespace tracing