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#include "Common/BitUtil.h"
#include "gtest/gtest.h"
#include <boost/utility/binary.hpp>
/** Test limits */
TEST(popcountTest, boundaries)
{
EXPECT_EQ(64ULL, popcount(0xffffffffffffffffULL));
EXPECT_EQ(0ULL, popcount(0ULL));
}
/** Test some random values */
TEST(popcountTest, random_values)
{
EXPECT_EQ(45ULL, popcount(0x992E54FFFFFFFBA1ULL));
EXPECT_EQ(45ULL, popcount(0x814BC5FFFFFFF7FULL));
EXPECT_EQ(46ULL, popcount(0x815BC5FFFFFFF7FULL));
}
TEST(readBitsTest, overwriteBits)
{
// NOTE!: In the binary diagrams below, the rightmost bit of each byte
// is the LSB.
size_t bitSize, bitOffset;
char src[2];
char dest[4];
// SUBTEST: src size < 1 byte
//
// src = 000
// bit offset = 9
// dest = 11111111 11111111 11111111 11111111
// expected result = 11111111 10001111 11111111 11111111
bitSize = 3;
bitOffset = 9;
memset(src, 0x00, 2);
memset(dest, 0xFF, 4);
std::istringstream in1(std::string(src, (bitSize + 7)/8));
readBits(in1, dest, bitSize, bitOffset);
EXPECT_EQ((char)0xFF, dest[0]);
EXPECT_EQ((char)BOOST_BINARY(10001111), dest[1]);
EXPECT_EQ((char)0xFF, dest[2]);
EXPECT_EQ((char)0xFF, dest[3]);
// SUBTEST: byte-aligned with partial last byte
//
// src = 00000000 000
// bit offset = 8
// dest = 11111111 11111111 11111111 11111111
// expected result = 11111111 00000000 00011111 11111111
bitSize = 11;
bitOffset = 8;
memset(src, 0x00, 2);
memset(dest, 0xFF, 4);
std::istringstream in2(std::string(src, (bitSize + 7)/8));
readBits(in2, dest, bitSize, bitOffset);
EXPECT_EQ((char)0xFF, dest[0]);
EXPECT_EQ((char)0x00, dest[1]);
EXPECT_EQ((char)BOOST_BINARY(00011111), dest[2]);
EXPECT_EQ((char)0xFF, dest[3]);
// SUBTEST: not byte-aligned, src size > 1 byte
//
// src = 00000000 00000000
// bit offset = 4
// dest = 11111111 11111111 11111111 11111111
// expected result = 11110000 00000000 00011111 11111111
bitSize = 15;
bitOffset = 4;
memset(src, 0x00, 2);
memset(dest, 0xFF, 4);
std::istringstream in3(std::string(src, (bitSize + 7)/8));
readBits(in3, dest, bitSize, bitOffset);
EXPECT_EQ((char)BOOST_BINARY(11110000), dest[0]);
EXPECT_EQ((char)0x00, dest[1]);
EXPECT_EQ((char)BOOST_BINARY(00011111), dest[2]);
EXPECT_EQ((char)0xFF, dest[3]);
}
TEST(readBitsTest, orBits)
{
// NOTE!: In the binary diagrams below, the rightmost bit of each byte
// is the LSB.
size_t bitSize, bitOffset;
char src[2];
char dest[4];
// SUBTEST: src size < 1 byte
//
// src = 101
// bit offset = 9
// dest = 10101010 10101010 10101010 10101010
// expected result = 10101010 11111010 10101010 10101010
bitSize = 3;
bitOffset = 9;
memset(src, 0x00, 2);
src[0] = BOOST_BINARY(10100000);
memset(dest, BOOST_BINARY(10101010), 4);
std::istringstream in1(std::string(src, (bitSize + 7)/8));
readBits(in1, dest, bitSize, bitOffset, BITWISE_OR);
EXPECT_EQ((char)BOOST_BINARY(10101010), dest[0]);
EXPECT_EQ((char)BOOST_BINARY(11111010), dest[1]);
EXPECT_EQ((char)BOOST_BINARY(10101010), dest[2]);
EXPECT_EQ((char)BOOST_BINARY(10101010), dest[3]);
// SUBTEST: byte-aligned with partial last byte
//
// src = 01010101 010
// bit offset = 8
// dest = 10101010 10101010 10101010 10101010
// expected result = 10101010 11111111 11101010 10101010
bitSize = 11;
bitOffset = 8;
memset(src, 0x00, 2);
src[0] = BOOST_BINARY(01010101);
src[1] = BOOST_BINARY(01000000);
memset(dest, BOOST_BINARY(10101010), 4);
std::istringstream in2(std::string(src, (bitSize + 7)/8));
readBits(in2, dest, bitSize, bitOffset, BITWISE_OR);
EXPECT_EQ((char)BOOST_BINARY(10101010), dest[0]);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[1]);
EXPECT_EQ((char)BOOST_BINARY(11101010), dest[2]);
EXPECT_EQ((char)BOOST_BINARY(10101010), dest[3]);
// SUBTEST: not byte-aligned, src size > 1 byte
//
// src = 01010101 0101010
// bit offset = 4
// dest = 10101010 10101010 10101010 10101010
// expected result = 10101111 11111111 11101010 10101010
bitSize = 15;
bitOffset = 4;
memset(src, 0x00, 2);
src[0] = BOOST_BINARY(01010101);
src[1] = BOOST_BINARY(01010100);
memset(dest, BOOST_BINARY(10101010), 4);
std::istringstream in3(std::string(src, (bitSize + 7)/8));
readBits(in3, dest, bitSize, bitOffset, BITWISE_OR);
EXPECT_EQ((char)BOOST_BINARY(10101111), dest[0]);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[1]);
EXPECT_EQ((char)BOOST_BINARY(11101010), dest[2]);
EXPECT_EQ((char)BOOST_BINARY(10101010), dest[3]);
}
TEST(readBitsTest, andBits)
{
// NOTE!: In the binary diagrams below, the rightmost bit of each byte
// is the LSB.
size_t bitSize, bitOffset;
char src[2];
char dest[4];
// SUBTEST: src size < 1 byte
//
// src = 101
// bit offset = 9
// dest = 11111111 11111111 11111111 11111111
// expected result = 11111111 11011111 11111111 11111111
bitSize = 3;
bitOffset = 9;
memset(src, 0x00, 2);
src[0] = BOOST_BINARY(10100000);
memset(dest, BOOST_BINARY(11111111), 4);
std::istringstream in1(std::string(src, (bitSize + 7)/8));
readBits(in1, dest, bitSize, bitOffset, BITWISE_AND);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[0]);
EXPECT_EQ((char)BOOST_BINARY(11011111), dest[1]);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[2]);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[3]);
// SUBTEST: byte-aligned with partial last byte
//
// src = 01010101 010
// bit offset = 8
// dest = 11111111 11111111 11111111 11111111
// expected result = 11111111 01010101 01011111 11111111
bitSize = 11;
bitOffset = 8;
memset(src, 0x00, 2);
src[0] = BOOST_BINARY(01010101);
src[1] = BOOST_BINARY(01000000);
memset(dest, BOOST_BINARY(11111111), 4);
std::istringstream in2(std::string(src, (bitSize + 7)/8));
readBits(in2, dest, bitSize, bitOffset, BITWISE_AND);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[0]);
EXPECT_EQ((char)BOOST_BINARY(01010101), dest[1]);
EXPECT_EQ((char)BOOST_BINARY(01011111), dest[2]);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[3]);
// SUBTEST: not byte-aligned, src size > 1 byte
//
// src = 01010101 0101010
// bit offset = 4
// dest = 11111111 11111111 11111111 11111111
// expected result = 11110101 01010101 01011111 11111111
bitSize = 15;
bitOffset = 4;
memset(src, 0x00, 2);
src[0] = BOOST_BINARY(01010101);
src[1] = BOOST_BINARY(01010100);
memset(dest, BOOST_BINARY(11111111), 4);
std::istringstream in3(std::string(src, (bitSize + 7)/8));
readBits(in3, dest, bitSize, bitOffset, BITWISE_AND);
EXPECT_EQ((char)BOOST_BINARY(11110101), dest[0]);
EXPECT_EQ((char)BOOST_BINARY(01010101), dest[1]);
EXPECT_EQ((char)BOOST_BINARY(01011111), dest[2]);
EXPECT_EQ((char)BOOST_BINARY(11111111), dest[3]);
}
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