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// 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 <limits>
#include "base/logging.h"
#include "base/macros.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace tracing {
namespace v2 {
namespace proto {
namespace {
struct VarIntExpectation {
const char* encoded;
size_t encoded_size;
uint64_t int_value;
};
const VarIntExpectation kVarIntExpectations[] = {
{"\x00", 1, 0},
{"\x01", 1, 0x1},
{"\x7f", 1, 0x7F},
{"\xFF\x01", 2, 0xFF},
{"\xFF\x7F", 2, 0x3FFF},
{"\x80\x80\x01", 3, 0x4000},
{"\xFF\xFF\x7F", 3, 0x1FFFFF},
{"\x80\x80\x80\x01", 4, 0x200000},
{"\xFF\xFF\xFF\x7F", 4, 0xFFFFFFF},
{"\x80\x80\x80\x80\x01", 5, 0x10000000},
{"\xFF\xFF\xFF\xFF\x0F", 5, 0xFFFFFFFF},
{"\x80\x80\x80\x80\x10", 5, 0x100000000},
{"\xFF\xFF\xFF\xFF\x7F", 5, 0x7FFFFFFFF},
{"\x80\x80\x80\x80\x80\x01", 6, 0x800000000},
{"\xFF\xFF\xFF\xFF\xFF\x7F", 6, 0x3FFFFFFFFFF},
{"\x80\x80\x80\x80\x80\x80\x01", 7, 0x40000000000},
{"\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 7, 0x1FFFFFFFFFFFF},
{"\x80\x80\x80\x80\x80\x80\x80\x01", 8, 0x2000000000000},
{"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 8, 0xFFFFFFFFFFFFFF},
{"\x80\x80\x80\x80\x80\x80\x80\x80\x01", 9, 0x100000000000000},
{"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x7F", 9, 0x7FFFFFFFFFFFFFFF},
{"\x80\x80\x80\x80\x80\x80\x80\x80\x80\x01", 10, 0x8000000000000000},
{"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\x01", 10, 0xFFFFFFFFFFFFFFFF},
};
struct FieldExpectation {
const char* encoded;
size_t encoded_size;
uint32_t id;
FieldType type;
uint64_t int_value;
};
const FieldExpectation kFieldExpectations[] = {
{"\x08\x00", 2, 1, kFieldTypeVarInt, 0},
{"\x08\x42", 2, 1, kFieldTypeVarInt, 0x42},
{"\xF8\x07\x42", 3, 127, kFieldTypeVarInt, 0x42},
{"\x90\x4D\xFF\xFF\xFF\xFF\x0F", 7, 1234, kFieldTypeVarInt, 0xFFFFFFFF},
{"\x7D\x42\x00\x00\x00", 5, 15, kFieldTypeFixed32, 0x42},
{"\x95\x4D\x78\x56\x34\x12", 6, 1234, kFieldTypeFixed32, 0x12345678},
{"\x79\x42\x00\x00\x00\x00\x00\x00\x00", 9, 15, kFieldTypeFixed64, 0x42},
{"\x91\x4D\x08\x07\x06\x05\x04\x03\x02\x01", 10, 1234, kFieldTypeFixed64,
0x0102030405060708},
{"\x0A\x00", 2, 1, kFieldTypeLengthDelimited, 0},
{"\x0A\x04|abc", 6, 1, kFieldTypeLengthDelimited, 4},
{"\x92\x4D\x04|abc", 7, 1234, kFieldTypeLengthDelimited, 4},
{"\x92\x4D\x83\x01|abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd"
"efghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwx",
135, 1234, kFieldTypeLengthDelimited, 131},
};
TEST(ProtoUtilsTest, FieldPreambleEncoding) {
// According to C++ standard, right shift of negative value has
// implementation-defined resulting value.
if ((static_cast<int32_t>(0x80000000u) >> 31) != -1)
FAIL() << "Platform has unsupported negative number format or arithmetic";
EXPECT_EQ(0x08u, MakeTagVarInt(1));
EXPECT_EQ(0x09u, MakeTagFixed<uint64_t>(1));
EXPECT_EQ(0x0Au, MakeTagLengthDelimited(1));
EXPECT_EQ(0x0Du, MakeTagFixed<uint32_t>(1));
EXPECT_EQ(0x03F8u, MakeTagVarInt(0x7F));
EXPECT_EQ(0x03F9u, MakeTagFixed<int64_t>(0x7F));
EXPECT_EQ(0x03FAu, MakeTagLengthDelimited(0x7F));
EXPECT_EQ(0x03FDu, MakeTagFixed<int32_t>(0x7F));
EXPECT_EQ(0x0400u, MakeTagVarInt(0x80));
EXPECT_EQ(0x0401u, MakeTagFixed<double>(0x80));
EXPECT_EQ(0x0402u, MakeTagLengthDelimited(0x80));
EXPECT_EQ(0x0405u, MakeTagFixed<float>(0x80));
EXPECT_EQ(0x01FFF8u, MakeTagVarInt(0x3fff));
EXPECT_EQ(0x01FFF9u, MakeTagFixed<int64_t>(0x3fff));
EXPECT_EQ(0x01FFFAu, MakeTagLengthDelimited(0x3fff));
EXPECT_EQ(0x01FFFDu, MakeTagFixed<int32_t>(0x3fff));
EXPECT_EQ(0x020000u, MakeTagVarInt(0x4000));
EXPECT_EQ(0x020001u, MakeTagFixed<int64_t>(0x4000));
EXPECT_EQ(0x020002u, MakeTagLengthDelimited(0x4000));
EXPECT_EQ(0x020005u, MakeTagFixed<int32_t>(0x4000));
}
TEST(ProtoUtilsTest, ZigZagEncoding) {
EXPECT_EQ(0u, ZigZagEncode(0));
EXPECT_EQ(1u, ZigZagEncode(-1));
EXPECT_EQ(2u, ZigZagEncode(1));
EXPECT_EQ(3u, ZigZagEncode(-2));
EXPECT_EQ(4294967293u, ZigZagEncode(-2147483647));
EXPECT_EQ(4294967294u, ZigZagEncode(2147483647));
EXPECT_EQ(std::numeric_limits<uint32_t>::max(),
ZigZagEncode(std::numeric_limits<int32_t>::min()));
EXPECT_EQ(std::numeric_limits<uint64_t>::max(),
ZigZagEncode(std::numeric_limits<int64_t>::min()));
}
TEST(ProtoUtilsTest, VarIntEncoding) {
for (size_t i = 0; i < arraysize(kVarIntExpectations); ++i) {
const VarIntExpectation& exp = kVarIntExpectations[i];
uint8_t buf[32];
uint8_t* res = WriteVarInt<uint64_t>(exp.int_value, buf);
ASSERT_EQ(exp.encoded_size, static_cast<size_t>(res - buf));
ASSERT_EQ(0, memcmp(buf, exp.encoded, exp.encoded_size));
if (exp.int_value <= std::numeric_limits<uint32_t>::max()) {
uint8_t* res = WriteVarInt<uint32_t>(exp.int_value, buf);
ASSERT_EQ(exp.encoded_size, static_cast<size_t>(res - buf));
ASSERT_EQ(0, memcmp(buf, exp.encoded, exp.encoded_size));
}
}
}
TEST(ProtoUtilsTest, RedundantVarIntEncoding) {
uint8_t buf[kMessageLengthFieldSize];
WriteRedundantVarInt(0, buf);
EXPECT_EQ(0, memcmp("\x80\x80\x80\x00", buf, sizeof(buf)));
WriteRedundantVarInt(1, buf);
EXPECT_EQ(0, memcmp("\x81\x80\x80\x00", buf, sizeof(buf)));
WriteRedundantVarInt(0x80, buf);
EXPECT_EQ(0, memcmp("\x80\x81\x80\x00", buf, sizeof(buf)));
WriteRedundantVarInt(0x332211, buf);
EXPECT_EQ(0, memcmp("\x91\xC4\xCC\x01", buf, sizeof(buf)));
// Largest allowed length.
WriteRedundantVarInt(0x0FFFFFFF, buf);
EXPECT_EQ(0, memcmp("\xFF\xFF\xFF\x7F", buf, sizeof(buf)));
}
TEST(ProtoUtilsTest, VarIntDecoding) {
for (size_t i = 0; i < arraysize(kVarIntExpectations); ++i) {
const VarIntExpectation& exp = kVarIntExpectations[i];
uint64_t value = std::numeric_limits<uint64_t>::max();
const uint8_t* res = ParseVarInt(
reinterpret_cast<const uint8_t*>(exp.encoded),
reinterpret_cast<const uint8_t*>(exp.encoded + exp.encoded_size),
&value);
ASSERT_EQ(reinterpret_cast<const void*>(exp.encoded + exp.encoded_size),
reinterpret_cast<const void*>(res));
ASSERT_EQ(exp.int_value, value);
}
}
TEST(ProtoUtilsTest, FieldDecoding) {
for (size_t i = 0; i < arraysize(kFieldExpectations); ++i) {
const FieldExpectation& exp = kFieldExpectations[i];
FieldType field_type = kFieldTypeVarInt;
uint32_t field_id = std::numeric_limits<uint32_t>::max();
uint64_t field_intvalue = std::numeric_limits<uint64_t>::max();
const uint8_t* res = ParseField(
reinterpret_cast<const uint8_t*>(exp.encoded),
reinterpret_cast<const uint8_t*>(exp.encoded + exp.encoded_size),
&field_id, &field_type, &field_intvalue);
ASSERT_EQ(reinterpret_cast<const void*>(exp.encoded + exp.encoded_size),
reinterpret_cast<const void*>(res));
ASSERT_EQ(exp.id, field_id);
ASSERT_EQ(exp.type, field_type);
ASSERT_EQ(exp.int_value, field_intvalue);
}
}
} // namespace
} // namespace proto
} // namespace v2
} // namespace tracing
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