endian-reverse-test.c++ (3402B)
1 // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors 2 // Licensed under the MIT License: 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a copy 5 // of this software and associated documentation files (the "Software"), to deal 6 // in the Software without restriction, including without limitation the rights 7 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 // copies of the Software, and to permit persons to whom the Software is 9 // furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 20 // THE SOFTWARE. 21 22 #if !_MSC_VER 23 // (MSVC targets only little-endian platforms and so we haven't implemented any byte swapping 24 // intrinsics for it. So, this test would fail there.) 25 26 // Test that the code for the opposite endianness of our CPU works. E.g. on x86 this will test 27 // the bswap-based code. 28 #define CAPNP_REVERSE_ENDIAN 1 29 #include "endian.h" 30 #include <kj/compat/gtest.h> 31 32 namespace capnp { 33 namespace _ { // private 34 namespace { 35 36 TEST(EndianReverse, Byte) { 37 byte bytes[] = {123, 45, 67, 89}; 38 39 WireValue<uint8_t>* vals = reinterpret_cast<WireValue<uint8_t>*>(bytes); 40 41 EXPECT_EQ(123, vals[0].get()); 42 EXPECT_EQ(45, vals[1].get()); 43 EXPECT_EQ(67, vals[2].get()); 44 EXPECT_EQ(89, vals[3].get()); 45 46 vals[0].set(21); 47 vals[1].set(43); 48 vals[2].set(65); 49 vals[3].set(87); 50 51 EXPECT_EQ(21, bytes[0]); 52 EXPECT_EQ(43, bytes[1]); 53 EXPECT_EQ(65, bytes[2]); 54 EXPECT_EQ(87, bytes[3]); 55 } 56 57 TEST(EndianReverse, TwoBytes) { 58 byte bytes[] = {0x12, 0x34, 0x56, 0x78}; 59 60 WireValue<uint16_t>* vals = reinterpret_cast<WireValue<uint16_t>*>(bytes); 61 62 EXPECT_EQ(0x1234, vals[0].get()); 63 EXPECT_EQ(0x5678, vals[1].get()); 64 65 vals[0].set(0x2345); 66 vals[1].set(0x6789); 67 68 EXPECT_EQ(0x23, bytes[0]); 69 EXPECT_EQ(0x45, bytes[1]); 70 EXPECT_EQ(0x67, bytes[2]); 71 EXPECT_EQ(0x89, bytes[3]); 72 } 73 74 TEST(EndianReverse, FourBytes) { 75 byte bytes[] = {0x12, 0x34, 0x56, 0x78}; 76 77 WireValue<uint32_t>* vals = reinterpret_cast<WireValue<uint32_t>*>(bytes); 78 79 EXPECT_EQ(0x12345678u, vals[0].get()); 80 81 vals[0].set(0x23456789); 82 83 EXPECT_EQ(0x23, bytes[0]); 84 EXPECT_EQ(0x45, bytes[1]); 85 EXPECT_EQ(0x67, bytes[2]); 86 EXPECT_EQ(0x89, bytes[3]); 87 } 88 89 TEST(EndianReverse, EightBytes) { 90 byte bytes[] = {0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0}; 91 92 WireValue<uint64_t>* vals = reinterpret_cast<WireValue<uint64_t>*>(bytes); 93 94 EXPECT_EQ(0x123456789abcdef0ull, vals[0].get()); 95 96 vals[0].set(0x23456789abcdef01ull); 97 98 EXPECT_EQ(0x23, bytes[0]); 99 EXPECT_EQ(0x45, bytes[1]); 100 EXPECT_EQ(0x67, bytes[2]); 101 EXPECT_EQ(0x89, bytes[3]); 102 EXPECT_EQ(0xab, bytes[4]); 103 EXPECT_EQ(0xcd, bytes[5]); 104 EXPECT_EQ(0xef, bytes[6]); 105 EXPECT_EQ(0x01, bytes[7]); 106 } 107 108 } // namespace 109 } // namespace _ (private) 110 } // namespace capnp 111 112 #endif // !_MSC_VER