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/*
* Copyright (c) 2015, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "gtest/gtest.h"
#include "util/pack_bits.h"
#include "util/make_unique.h"
#include "ue2common.h"
#include <algorithm>
#include <memory>
#include <vector>
using std::unique_ptr;
using std::vector;
template <typename T>
class PackBits : public testing::Test {};
typedef ::testing::Types<u32, u64a> PackBitsTypes;
TYPED_TEST_CASE(PackBits, PackBitsTypes);
// Templated wrappers around the pack_bits_{32,64} functions.
template <typename T>
void pack_bits(char *out, const T *v, const u32 *bits, unsigned elements);
template <typename T>
void unpack_bits(T *v, const char *in, const u32 *bits, unsigned elements);
template <>
void pack_bits<u32>(char *out, const u32 *v, const u32 *bits,
unsigned elements) {
return pack_bits_32(out, v, bits, elements);
}
template <>
void pack_bits<u64a>(char *out, const u64a *v, const u32 *bits,
unsigned elements) {
return pack_bits_64(out, v, bits, elements);
}
template <>
void unpack_bits<u32>(u32 *v, const char *in, const u32 *bits,
unsigned elements) {
return unpack_bits_32(v, (const u8 *)in, bits, elements);
}
template <>
void unpack_bits<u64a>(u64a *v, const char *in, const u32 *bits,
unsigned elements) {
return unpack_bits_64(v, (const u8 *)in, bits, elements);
}
template <typename T>
size_t packed_size(const vector<T> &bits) {
size_t num_bits = 0;
for (size_t i = 0; i < bits.size(); i++) {
num_bits += bits[i];
}
return ROUNDUP_N(num_bits, 8U) / 8U;
}
template <typename T>
void test_pack_and_unpack(const vector<T> &v, const vector<u32> &bits) {
const u32 max_bits = sizeof(T) * 8U;
const u32 elements = bits.size();
// Temporary char array to pack into.
const size_t mem_size = packed_size(bits);
unique_ptr<char[]> mem = ue2::make_unique<char[]>(mem_size);
pack_bits<T>(&mem[0], &v[0], &bits[0], elements);
vector<T> v2(elements, 0xcafecafeu); // Output vector.
unpack_bits<T>(&v2[0], &mem[0], &bits[0], elements);
for (u32 i = 0; i < elements; i++) {
// Check that v2[i] contains the bits[i] low bits of v[i].
T mask = bits[i] == max_bits ? ~(T)0 : ((T)1U << bits[i]) - 1;
ASSERT_EQ(v[i] & mask, v2[i]) << "element " << i << " mismatch";
}
}
TYPED_TEST(PackBits, AllZeroes) {
for (u32 i = 1; i < 32; i++) {
SCOPED_TRACE(i);
vector<TypeParam> v(i, 0);
vector<u32> bits(i, sizeof(TypeParam) * 8U); // all bits
test_pack_and_unpack(v, bits);
}
}
TYPED_TEST(PackBits, AllOnes) {
for (u32 i = 1; i < 32; i++) {
SCOPED_TRACE(i);
vector<TypeParam> v(i, ~((TypeParam)0));
for (u32 num_bits = 0; num_bits < sizeof(TypeParam) * 8U; num_bits++) {
vector<u32> bits(i, num_bits);
test_pack_and_unpack(v, bits);
}
}
}
TYPED_TEST(PackBits, SomeOnes) {
for (u32 i = 1; i < 32; i++) {
SCOPED_TRACE(i);
vector<TypeParam> v(i, ~((TypeParam)0));
// One bit from v[0], two bits from v[1] ...
vector<u32> bits(i);
for (u32 j = 0; j < i; j++) {
}
test_pack_and_unpack(v, bits);
// And in reverse
std::reverse(bits.begin(), bits.end());
test_pack_and_unpack(v, bits);
}
}
TYPED_TEST(PackBits, Holes) {
for (u32 i = 1; i < 32; i++) {
SCOPED_TRACE(i);
vector<TypeParam> v(i, ~((TypeParam)0));
// No bits from odd-numbered words.
vector<u32> bits(i);
for (u32 j = 0; j < i; j++) {
bits[j] = j % 2 ? 0 : sizeof(TypeParam) * 8U;
}
test_pack_and_unpack(v, bits);
}
}
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