| // Copyright 2014 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/big_endian.h" |
| |
| #include <stdint.h> |
| |
| #include <limits> |
| |
| #include "base/strings/string_piece.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace base { |
| |
| TEST(ReadBigEndianTest, ReadSignedPositive) { |
| uint8_t data[] = {0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x1A, 0x2A}; |
| int8_t s8 = 0; |
| int16_t s16 = 0; |
| int32_t s32 = 0; |
| int64_t s64 = 0; |
| ReadBigEndian(data, &s8); |
| ReadBigEndian(data, &s16); |
| ReadBigEndian(data, &s32); |
| ReadBigEndian(data, &s64); |
| EXPECT_EQ(0x0A, s8); |
| EXPECT_EQ(0x0A0B, s16); |
| EXPECT_EQ(int32_t{0x0A0B0C0D}, s32); |
| EXPECT_EQ(int64_t{0x0A0B0C0D0E0F1A2All}, s64); |
| } |
| |
| TEST(ReadBigEndianTest, ReadSignedNegative) { |
| uint8_t data[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
| int8_t s8 = 0; |
| int16_t s16 = 0; |
| int32_t s32 = 0; |
| int64_t s64 = 0; |
| ReadBigEndian(data, &s8); |
| ReadBigEndian(data, &s16); |
| ReadBigEndian(data, &s32); |
| ReadBigEndian(data, &s64); |
| EXPECT_EQ(-1, s8); |
| EXPECT_EQ(-1, s16); |
| EXPECT_EQ(-1, s32); |
| EXPECT_EQ(-1, s64); |
| } |
| |
| TEST(ReadBigEndianTest, ReadUnsignedSigned) { |
| uint8_t data[] = {0xA0, 0xB0, 0xC0, 0xD0, 0xE0, 0xF0, 0xA1, 0xA2}; |
| uint8_t u8 = 0; |
| uint16_t u16 = 0; |
| uint32_t u32 = 0; |
| uint64_t u64 = 0; |
| ReadBigEndian(data, &u8); |
| ReadBigEndian(data, &u16); |
| ReadBigEndian(data, &u32); |
| ReadBigEndian(data, &u64); |
| EXPECT_EQ(0xA0, u8); |
| EXPECT_EQ(0xA0B0, u16); |
| EXPECT_EQ(0xA0B0C0D0, u32); |
| EXPECT_EQ(0xA0B0C0D0E0F0A1A2ull, u64); |
| } |
| |
| TEST(ReadBigEndianTest, TryAll16BitValues) { |
| using signed_type = int16_t; |
| uint8_t data[sizeof(signed_type)]; |
| for (int i = std::numeric_limits<signed_type>::min(); |
| i <= std::numeric_limits<signed_type>::max(); i++) { |
| signed_type expected = i; |
| signed_type actual = 0; |
| WriteBigEndian(reinterpret_cast<char*>(data), expected); |
| ReadBigEndian(data, &actual); |
| EXPECT_EQ(expected, actual); |
| } |
| } |
| |
| TEST(BigEndianReaderTest, ReadsValues) { |
| uint8_t data[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, |
| 0xB, 0xC, 0xD, 0xE, 0xF, 0x1A, 0x2B, 0x3C, 0x4D, 0x5E}; |
| char buf[2]; |
| uint8_t u8; |
| uint16_t u16; |
| uint32_t u32; |
| uint64_t u64; |
| base::StringPiece piece; |
| BigEndianReader reader(data, sizeof(data)); |
| |
| EXPECT_TRUE(reader.Skip(2)); |
| EXPECT_EQ(data + 2, reader.ptr()); |
| EXPECT_EQ(reader.remaining(), sizeof(data) - 2); |
| EXPECT_TRUE(reader.ReadBytes(buf, sizeof(buf))); |
| EXPECT_EQ(0x2, buf[0]); |
| EXPECT_EQ(0x3, buf[1]); |
| EXPECT_TRUE(reader.ReadU8(&u8)); |
| EXPECT_EQ(0x4, u8); |
| EXPECT_TRUE(reader.ReadU16(&u16)); |
| EXPECT_EQ(0x0506, u16); |
| EXPECT_TRUE(reader.ReadU32(&u32)); |
| EXPECT_EQ(0x0708090Au, u32); |
| EXPECT_TRUE(reader.ReadU64(&u64)); |
| EXPECT_EQ(0x0B0C0D0E0F1A2B3Cllu, u64); |
| base::StringPiece expected(reinterpret_cast<const char*>(reader.ptr()), 2); |
| EXPECT_TRUE(reader.ReadPiece(&piece, 2)); |
| EXPECT_EQ(2u, piece.size()); |
| EXPECT_EQ(expected.data(), piece.data()); |
| } |
| |
| TEST(BigEndianReaderTest, ReadsLengthPrefixedValues) { |
| { |
| uint8_t u8_prefixed_data[] = {8, 8, 9, 0xA, 0xB, 0xC, 0xD, |
| 0xE, 0xF, 0x1A, 0x2B, 0x3C, 0x4D, 0x5E}; |
| BigEndianReader reader(u8_prefixed_data, sizeof(u8_prefixed_data)); |
| |
| base::StringPiece piece; |
| ASSERT_TRUE(reader.ReadU8LengthPrefixed(&piece)); |
| // |reader| should skip both a u8 and the length-8 length-prefixed field. |
| EXPECT_EQ(reader.ptr(), u8_prefixed_data + 9); |
| EXPECT_EQ(piece.size(), 8u); |
| EXPECT_EQ(reinterpret_cast<const uint8_t*>(piece.data()), |
| u8_prefixed_data + 1); |
| } |
| |
| { |
| uint8_t u16_prefixed_data[] = {0, 8, 0xD, 0xE, 0xF, |
| 0x1A, 0x2B, 0x3C, 0x4D, 0x5E}; |
| BigEndianReader reader(u16_prefixed_data, sizeof(u16_prefixed_data)); |
| base::StringPiece piece; |
| ASSERT_TRUE(reader.ReadU16LengthPrefixed(&piece)); |
| // |reader| should skip both a u16 and the length-8 length-prefixed field. |
| EXPECT_EQ(reader.ptr(), u16_prefixed_data + 10); |
| EXPECT_EQ(piece.size(), 8u); |
| EXPECT_EQ(reinterpret_cast<const uint8_t*>(piece.data()), |
| u16_prefixed_data + 2); |
| |
| // With no data left, we shouldn't be able to |
| // read another u8 length prefix (or a u16 length prefix, |
| // for that matter). |
| EXPECT_FALSE(reader.ReadU8LengthPrefixed(&piece)); |
| EXPECT_FALSE(reader.ReadU16LengthPrefixed(&piece)); |
| } |
| |
| { |
| // Make sure there's no issue reading a zero-value length prefix. |
| uint8_t u16_prefixed_data[3] = {}; |
| BigEndianReader reader(u16_prefixed_data, sizeof(u16_prefixed_data)); |
| base::StringPiece piece; |
| ASSERT_TRUE(reader.ReadU16LengthPrefixed(&piece)); |
| EXPECT_EQ(reader.ptr(), u16_prefixed_data + 2); |
| EXPECT_EQ(reinterpret_cast<const uint8_t*>(piece.data()), |
| u16_prefixed_data + 2); |
| EXPECT_EQ(piece.size(), 0u); |
| } |
| } |
| |
| TEST(BigEndianReaderTest, LengthPrefixedReadsFailGracefully) { |
| // We can't read 0xF (or, for that matter, 0xF8) bytes after the length |
| // prefix: there isn't enough data. |
| uint8_t data[] = {0xF, 8, 9, 0xA, 0xB, 0xC, 0xD, |
| 0xE, 0xF, 0x1A, 0x2B, 0x3C, 0x4D, 0x5E}; |
| BigEndianReader reader(data, sizeof(data)); |
| base::StringPiece piece; |
| EXPECT_FALSE(reader.ReadU8LengthPrefixed(&piece)); |
| EXPECT_EQ(data, reader.ptr()); |
| |
| EXPECT_FALSE(reader.ReadU16LengthPrefixed(&piece)); |
| EXPECT_EQ(data, reader.ptr()); |
| } |
| |
| TEST(BigEndianReaderTest, RespectsLength) { |
| uint8_t data[8]; |
| char buf[2]; |
| uint8_t u8; |
| uint16_t u16; |
| uint32_t u32; |
| uint64_t u64; |
| base::StringPiece piece; |
| BigEndianReader reader(data, sizeof(data)); |
| // 8 left |
| EXPECT_FALSE(reader.Skip(9)); |
| EXPECT_TRUE(reader.Skip(1)); |
| // 7 left |
| EXPECT_FALSE(reader.ReadU64(&u64)); |
| EXPECT_TRUE(reader.Skip(4)); |
| // 3 left |
| EXPECT_FALSE(reader.ReadU32(&u32)); |
| EXPECT_FALSE(reader.ReadPiece(&piece, 4)); |
| EXPECT_TRUE(reader.Skip(2)); |
| // 1 left |
| EXPECT_FALSE(reader.ReadU16(&u16)); |
| EXPECT_FALSE(reader.ReadBytes(buf, 2)); |
| EXPECT_TRUE(reader.Skip(1)); |
| // 0 left |
| EXPECT_FALSE(reader.ReadU8(&u8)); |
| EXPECT_EQ(0u, reader.remaining()); |
| } |
| |
| TEST(BigEndianReaderTest, SafePointerMath) { |
| uint8_t data[] = "foo"; |
| BigEndianReader reader(data, sizeof(data)); |
| // The test should fail without ever dereferencing the |dummy_buf| pointer. |
| char* dummy_buf = reinterpret_cast<char*>(0xdeadbeef); |
| // Craft an extreme length value that would cause |reader.data() + len| to |
| // overflow. |
| size_t extreme_length = std::numeric_limits<size_t>::max() - 1; |
| base::StringPiece piece; |
| EXPECT_FALSE(reader.Skip(extreme_length)); |
| EXPECT_FALSE(reader.ReadBytes(dummy_buf, extreme_length)); |
| EXPECT_FALSE(reader.ReadPiece(&piece, extreme_length)); |
| } |
| |
| TEST(BigEndianWriterTest, WritesValues) { |
| char expected[] = { 0, 0, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, |
| 0xF, 0x1A, 0x2B, 0x3C }; |
| char data[sizeof(expected)]; |
| char buf[] = { 0x2, 0x3 }; |
| memset(data, 0, sizeof(data)); |
| BigEndianWriter writer(data, sizeof(data)); |
| |
| EXPECT_TRUE(writer.Skip(2)); |
| EXPECT_TRUE(writer.WriteBytes(buf, sizeof(buf))); |
| EXPECT_TRUE(writer.WriteU8(0x4)); |
| EXPECT_TRUE(writer.WriteU16(0x0506)); |
| EXPECT_TRUE(writer.WriteU32(0x0708090A)); |
| EXPECT_TRUE(writer.WriteU64(0x0B0C0D0E0F1A2B3Cllu)); |
| EXPECT_EQ(0, memcmp(expected, data, sizeof(expected))); |
| } |
| |
| TEST(BigEndianWriterTest, RespectsLength) { |
| char data[8]; |
| char buf[2]; |
| uint8_t u8 = 0; |
| uint16_t u16 = 0; |
| uint32_t u32 = 0; |
| uint64_t u64 = 0; |
| BigEndianWriter writer(data, sizeof(data)); |
| // 8 left |
| EXPECT_FALSE(writer.Skip(9)); |
| EXPECT_TRUE(writer.Skip(1)); |
| // 7 left |
| EXPECT_FALSE(writer.WriteU64(u64)); |
| EXPECT_TRUE(writer.Skip(4)); |
| // 3 left |
| EXPECT_FALSE(writer.WriteU32(u32)); |
| EXPECT_TRUE(writer.Skip(2)); |
| // 1 left |
| EXPECT_FALSE(writer.WriteU16(u16)); |
| EXPECT_FALSE(writer.WriteBytes(buf, 2)); |
| EXPECT_TRUE(writer.Skip(1)); |
| // 0 left |
| EXPECT_FALSE(writer.WriteU8(u8)); |
| EXPECT_EQ(0u, writer.remaining()); |
| } |
| |
| TEST(BigEndianWriterTest, SafePointerMath) { |
| char data[3]; |
| BigEndianWriter writer(data, sizeof(data)); |
| // The test should fail without ever dereferencing the |dummy_buf| pointer. |
| const char* dummy_buf = reinterpret_cast<const char*>(0xdeadbeef); |
| // Craft an extreme length value that would cause |reader.data() + len| to |
| // overflow. |
| size_t extreme_length = std::numeric_limits<size_t>::max() - 1; |
| EXPECT_FALSE(writer.Skip(extreme_length)); |
| EXPECT_FALSE(writer.WriteBytes(dummy_buf, extreme_length)); |
| } |
| |
| } // namespace base |