1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/big_endian.h"
6
7 #include <stdint.h>
8
9 #include "base/strings/string_piece.h"
10 #include "testing/gtest/include/gtest/gtest.h"
11
12 namespace base {
13
TEST(BigEndianReaderTest,ReadsValues)14 TEST(BigEndianReaderTest, ReadsValues) {
15 char data[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF,
16 0x1A, 0x2B, 0x3C, 0x4D, 0x5E };
17 char buf[2];
18 uint8_t u8;
19 uint16_t u16;
20 uint32_t u32;
21 uint64_t u64;
22 base::StringPiece piece;
23 BigEndianReader reader(data, sizeof(data));
24
25 EXPECT_TRUE(reader.Skip(2));
26 EXPECT_EQ(data + 2, reader.ptr());
27 EXPECT_EQ(reader.remaining(), static_cast<int>(sizeof(data)) - 2);
28 EXPECT_TRUE(reader.ReadBytes(buf, sizeof(buf)));
29 EXPECT_EQ(0x2, buf[0]);
30 EXPECT_EQ(0x3, buf[1]);
31 EXPECT_TRUE(reader.ReadU8(&u8));
32 EXPECT_EQ(0x4, u8);
33 EXPECT_TRUE(reader.ReadU16(&u16));
34 EXPECT_EQ(0x0506, u16);
35 EXPECT_TRUE(reader.ReadU32(&u32));
36 EXPECT_EQ(0x0708090Au, u32);
37 EXPECT_TRUE(reader.ReadU64(&u64));
38 EXPECT_EQ(0x0B0C0D0E0F1A2B3Cllu, u64);
39 base::StringPiece expected(reader.ptr(), 2);
40 EXPECT_TRUE(reader.ReadPiece(&piece, 2));
41 EXPECT_EQ(2u, piece.size());
42 EXPECT_EQ(expected.data(), piece.data());
43 }
44
TEST(BigEndianReaderTest,RespectsLength)45 TEST(BigEndianReaderTest, RespectsLength) {
46 char data[8];
47 char buf[2];
48 uint8_t u8;
49 uint16_t u16;
50 uint32_t u32;
51 uint64_t u64;
52 base::StringPiece piece;
53 BigEndianReader reader(data, sizeof(data));
54 // 8 left
55 EXPECT_FALSE(reader.Skip(9));
56 EXPECT_TRUE(reader.Skip(1));
57 // 7 left
58 EXPECT_FALSE(reader.ReadU64(&u64));
59 EXPECT_TRUE(reader.Skip(4));
60 // 3 left
61 EXPECT_FALSE(reader.ReadU32(&u32));
62 EXPECT_FALSE(reader.ReadPiece(&piece, 4));
63 EXPECT_TRUE(reader.Skip(2));
64 // 1 left
65 EXPECT_FALSE(reader.ReadU16(&u16));
66 EXPECT_FALSE(reader.ReadBytes(buf, 2));
67 EXPECT_TRUE(reader.Skip(1));
68 // 0 left
69 EXPECT_FALSE(reader.ReadU8(&u8));
70 EXPECT_EQ(0, reader.remaining());
71 }
72
TEST(BigEndianWriterTest,WritesValues)73 TEST(BigEndianWriterTest, WritesValues) {
74 char expected[] = { 0, 0, 2, 3, 4, 5, 6, 7, 8, 9, 0xA, 0xB, 0xC, 0xD, 0xE,
75 0xF, 0x1A, 0x2B, 0x3C };
76 char data[sizeof(expected)];
77 char buf[] = { 0x2, 0x3 };
78 memset(data, 0, sizeof(data));
79 BigEndianWriter writer(data, sizeof(data));
80
81 EXPECT_TRUE(writer.Skip(2));
82 EXPECT_TRUE(writer.WriteBytes(buf, sizeof(buf)));
83 EXPECT_TRUE(writer.WriteU8(0x4));
84 EXPECT_TRUE(writer.WriteU16(0x0506));
85 EXPECT_TRUE(writer.WriteU32(0x0708090A));
86 EXPECT_TRUE(writer.WriteU64(0x0B0C0D0E0F1A2B3Cllu));
87 EXPECT_EQ(0, memcmp(expected, data, sizeof(expected)));
88 }
89
TEST(BigEndianWriterTest,RespectsLength)90 TEST(BigEndianWriterTest, RespectsLength) {
91 char data[8];
92 char buf[2];
93 uint8_t u8 = 0;
94 uint16_t u16 = 0;
95 uint32_t u32 = 0;
96 uint64_t u64 = 0;
97 BigEndianWriter writer(data, sizeof(data));
98 // 8 left
99 EXPECT_FALSE(writer.Skip(9));
100 EXPECT_TRUE(writer.Skip(1));
101 // 7 left
102 EXPECT_FALSE(writer.WriteU64(u64));
103 EXPECT_TRUE(writer.Skip(4));
104 // 3 left
105 EXPECT_FALSE(writer.WriteU32(u32));
106 EXPECT_TRUE(writer.Skip(2));
107 // 1 left
108 EXPECT_FALSE(writer.WriteU16(u16));
109 EXPECT_FALSE(writer.WriteBytes(buf, 2));
110 EXPECT_TRUE(writer.Skip(1));
111 // 0 left
112 EXPECT_FALSE(writer.WriteU8(u8));
113 EXPECT_EQ(0, writer.remaining());
114 }
115
116 } // namespace base
117