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/*
* Copyright (c) 2023 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/rtp_rtcp/source/leb128.h"
#include <cstdint>
#include <iterator>
#include <limits>
#include "api/array_view.h"
#include "test/gmock.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
using ::testing::ElementsAre;
TEST(Leb128Test, Size) {
EXPECT_EQ(Leb128Size(0), 1);
EXPECT_EQ(Leb128Size(0b0111'1111), 1);
EXPECT_EQ(Leb128Size(0b1000'0000), 2);
EXPECT_EQ(Leb128Size(std::numeric_limits<uint64_t>::max()), 10);
}
TEST(Leb128Test, ReadZero) {
const uint8_t one_byte[] = {0};
const uint8_t* read_at = one_byte;
EXPECT_EQ(ReadLeb128(read_at, std::end(one_byte)), uint64_t{0});
EXPECT_EQ(std::distance(read_at, std::end(one_byte)), 0);
}
TEST(Leb128Test, ReadOneByte) {
const uint8_t buffer[] = {0b0010'1100};
const uint8_t* read_at = buffer;
EXPECT_EQ(ReadLeb128(read_at, std::end(buffer)), uint64_t{0b0010'1100});
EXPECT_EQ(std::distance(read_at, std::end(buffer)), 0);
}
TEST(Leb128Test, ReadTwoByte) {
const uint8_t buffer[] = {0b1010'1100, 0b0111'0000};
const uint8_t* read_at = buffer;
EXPECT_EQ(ReadLeb128(read_at, std::end(buffer)),
uint64_t{0b111'0000'010'1100});
EXPECT_EQ(std::distance(read_at, std::end(buffer)), 0);
}
TEST(Leb128Test, ReadNearlyMaxValue1) {
const uint8_t buffer[] = {0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x7f};
const uint8_t* read_at = buffer;
EXPECT_EQ(ReadLeb128(read_at, std::end(buffer)),
uint64_t{0x7fff'ffff'ffff'ffff});
EXPECT_EQ(std::distance(read_at, std::end(buffer)), 0);
}
TEST(Leb128Test, ReadNearlyMaxValue2) {
// This is valid, though not optimal way to store 63 bits of the value.
const uint8_t buffer[] = {0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x0};
const uint8_t* read_at = buffer;
EXPECT_EQ(ReadLeb128(read_at, std::end(buffer)),
uint64_t{0x7fff'ffff'ffff'ffff});
EXPECT_EQ(std::distance(read_at, std::end(buffer)), 0);
}
TEST(Leb128Test, ReadMaxValue) {
// This is valid, though not optimal way to store 63 bits of the value.
const uint8_t buffer[] = {0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x1};
const uint8_t* read_at = buffer;
EXPECT_EQ(ReadLeb128(read_at, std::end(buffer)), 0xffff'ffff'ffff'ffff);
EXPECT_EQ(std::distance(read_at, std::end(buffer)), 0);
}
TEST(Leb128Test, FailsToReadMoreThanMaxValue) {
const uint8_t buffer[] = {0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x2};
const uint8_t* read_at = buffer;
ReadLeb128(read_at, std::end(buffer));
EXPECT_EQ(read_at, nullptr);
}
TEST(Leb128Test, DoesntReadMoreThan10Bytes) {
// Though this array represent leb128 encoded value that can fit in uint64_t,
// ReadLeb128 function discards it to avoid reading too many bytes from the
// buffer.
const uint8_t buffer[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0x80, 0x00};
const uint8_t* read_at = buffer;
ReadLeb128(read_at, std::end(buffer));
EXPECT_EQ(read_at, nullptr);
}
TEST(Leb128Test, WriteZero) {
uint8_t buffer[16];
EXPECT_EQ(WriteLeb128(0, buffer), 1);
EXPECT_EQ(buffer[0], 0);
}
TEST(Leb128Test, WriteOneByteValue) {
uint8_t buffer[16];
EXPECT_EQ(WriteLeb128(0b0010'1100, buffer), 1);
EXPECT_EQ(buffer[0], 0b0010'1100);
}
TEST(Leb128Test, WriteTwoByteValue) {
uint8_t buffer[16];
EXPECT_EQ(WriteLeb128(0b11'1111'010'1100, buffer), 2);
EXPECT_EQ(buffer[0], 0b1010'1100);
EXPECT_EQ(buffer[1], 0b0011'1111);
}
TEST(Leb128Test, WriteNearlyMaxValue) {
uint8_t buffer[16];
EXPECT_EQ(WriteLeb128(0x7fff'ffff'ffff'ffff, buffer), 9);
EXPECT_THAT(
MakeArrayView(buffer, 9),
ElementsAre(0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f));
}
TEST(Leb128Test, WriteMaxValue) {
uint8_t buffer[16];
EXPECT_EQ(WriteLeb128(0xffff'ffff'ffff'ffff, buffer), 10);
EXPECT_THAT(
MakeArrayView(buffer, 10),
ElementsAre(0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x01));
}
} // namespace
} // namespace webrtc
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