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Common/BitUtils: Add operator[] to BitCastPtrType
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2 changed files with 66 additions and 1 deletions
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@ -3,6 +3,9 @@
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#include <gtest/gtest.h>
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#include <bit>
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#include <vector>
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#include "Common/BitUtils.h"
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#include "Common/CommonTypes.h"
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@ -88,3 +91,52 @@ TEST(BitUtils, IsValidLowMask)
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EXPECT_FALSE(Common::IsValidLowMask((u64) ~(0b10000)));
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EXPECT_FALSE(Common::IsValidLowMask((u64)(~((u64)(~0b0) >> 1) | 0b1111)));
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}
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TEST(BitUtils, BitCastPtr)
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{
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EXPECT_EQ(std::endian::native, std::endian::little);
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std::vector<u8> data{0, 1, 0, 2, 0, 3, 0, 0xFF, 0xFF};
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u8* buffer = data.data();
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EXPECT_EQ(s16(1), Common::BitCastPtr<s16>(buffer + 1));
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Common::BitCastPtr<s16>(buffer + 1) = s16(-1);
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EXPECT_EQ(u16(0xFFFF), Common::BitCastPtr<u16>(buffer + 1));
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EXPECT_EQ(data, std::vector<u8>({0, 0xFF, 0xFF, 2, 0, 3, 0, 0xFF, 0xFF}));
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EXPECT_EQ(s32(0xFFFF0003), Common::BitCastPtr<s32>(buffer + 1)[1]);
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Common::BitCastPtr<u32>(buffer + 1)[1] = u32(0xFFFFFFFF);
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EXPECT_EQ(s32(-1), Common::BitCastPtr<s32>(buffer + 1)[1]);
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EXPECT_EQ(data, std::vector<u8>({0, 0xFF, 0xFF, 2, 0, 0xFF, 0xFF, 0xFF, 0xFF}));
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#pragma pack(push, 1)
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struct MyStruct
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{
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u16 v16;
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u8 v8;
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};
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#pragma pack(pop)
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MyStruct s1 = Common::BitCastPtr<MyStruct>(buffer + 1);
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EXPECT_EQ(u16(0xFFFF), s1.v16);
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EXPECT_EQ(u8(2), s1.v8);
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s1.v16 = 4;
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s1.v8 = 5;
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Common::BitCastPtr<MyStruct>(buffer + 1) = s1;
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EXPECT_EQ(s16(4), Common::BitCastPtr<s16>(buffer + 1));
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EXPECT_EQ(s8(5), Common::BitCastPtr<s8>(buffer + 3));
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EXPECT_EQ(data, std::vector<u8>({0, 4, 0, 5, 0, 0xFF, 0xFF, 0xFF, 0xFF}));
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auto struct_array = Common::BitCastPtr<MyStruct>(buffer + 1);
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const MyStruct s1_again = struct_array[0];
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EXPECT_EQ(u16(4), s1_again.v16);
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EXPECT_EQ(u8(5), s1_again.v8);
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MyStruct s2 = struct_array[1];
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EXPECT_EQ(u16(0xFF00), s2.v16);
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EXPECT_EQ(u8(0xFF), s2.v8);
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struct_array[1] = s1_again;
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s2 = struct_array[1];
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EXPECT_EQ(u16(4), s2.v16);
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EXPECT_EQ(u8(5), s2.v8);
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EXPECT_EQ(data, std::vector<u8>({0, 4, 0, 5, 4, 0, 5, 0xFF, 0xFF}));
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}
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