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// Copyright 2019 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "libipp/ipp_encoding.h"
#include <vector>
#include <gtest/gtest.h>
namespace ipp {
namespace {
// Represents single test case.
struct TestCase {
// a value to read/write
int64_t value;
// 1-,2- and 4- bytes representations of the value in two's-complement binary
// encoding. Corresponding vector is empty <=> the value is out of range
// (cannot be saved on given number of bytes).
std::vector<uint8_t> as1byte;
std::vector<uint8_t> as2bytes;
std::vector<uint8_t> as4bytes;
// constructor
explicit TestCase(int64_t v) : value(v) {}
};
// All Test* templates below have the same parameters:
// BytesCount - 1, 2 or 4 - designated integer size in binary encoding
// Integer / SignedInteger / UnsignedInteger - type of parameter used in
// instantiation of tested template
// binary - one of the buffer from TestCase structure
// value - a value from TestCase structure
template <size_t BytesCount, typename Integer>
void TestReadSignedInt(const std::vector<uint8_t>& binary,
const int64_t value) {
const uint8_t* ptr = binary.data();
Integer out;
ParseSignedInteger<BytesCount, Integer>(&ptr, &out);
EXPECT_EQ(ptr, binary.data() + BytesCount);
EXPECT_EQ(out, value);
}
template <size_t BytesCount, typename Integer>
void TestReadUnsignedInt(const std::vector<uint8_t>& binary,
const int64_t value) {
const uint8_t* ptr = binary.data();
Integer out = 123;
const bool result = ParseUnsignedInteger<BytesCount, Integer>(&ptr, &out);
EXPECT_EQ(ptr, binary.data() + BytesCount);
if (value < 0) {
EXPECT_FALSE(result);
EXPECT_EQ(out, 123);
} else {
EXPECT_TRUE(result);
EXPECT_EQ(out, value);
}
}
template <size_t BytesCount, typename SignedInteger, typename UnsignedInteger>
void TestRead(const std::vector<uint8_t>& binary, const int64_t value) {
static_assert(std::is_integral<SignedInteger>::value, "integral expected");
static_assert(std::is_integral<UnsignedInteger>::value, "integral expected");
static_assert(std::is_signed<SignedInteger>::value, "signed expected");
static_assert(std::is_unsigned<UnsignedInteger>::value, "unsigned expected");
static_assert(sizeof(SignedInteger) == sizeof(UnsignedInteger),
"the same sizes expected");
if (!binary.empty()) {
ASSERT_EQ(BytesCount, binary.size());
TestReadSignedInt<BytesCount, SignedInteger>(binary, value);
TestReadUnsignedInt<BytesCount, SignedInteger>(binary, value);
TestReadUnsignedInt<BytesCount, UnsignedInteger>(binary, value);
}
}
template <size_t BytesCount, typename Integer>
void TestWriteInt(const std::vector<uint8_t>& binary, const Integer value) {
std::vector<uint8_t> buffer(BytesCount, 123);
uint8_t* ptr = buffer.data();
WriteInteger<BytesCount, Integer>(&ptr, value);
EXPECT_EQ(ptr, buffer.data() + BytesCount);
EXPECT_EQ(buffer, binary);
}
template <size_t BytesCount, typename Integer>
void TestWriteUnsigned(const std::vector<uint8_t>& binary,
const Integer value) {
std::vector<uint8_t> buffer(BytesCount, 123);
uint8_t* ptr = buffer.data();
WriteUnsigned<BytesCount, Integer>(&ptr, value);
EXPECT_EQ(ptr, buffer.data() + BytesCount);
EXPECT_EQ(buffer, binary);
}
template <size_t BytesCount, typename SignedInteger, typename UnsignedInteger>
void TestWrite(const std::vector<uint8_t>& binary, const int64_t value) {
static_assert(std::is_integral<SignedInteger>::value, "integral expected");
static_assert(std::is_integral<UnsignedInteger>::value, "integral expected");
static_assert(std::is_signed<SignedInteger>::value, "signed expected");
static_assert(std::is_unsigned<UnsignedInteger>::value, "unsigned expected");
static_assert(sizeof(SignedInteger) == sizeof(UnsignedInteger),
"the same sizes expected");
ASSERT_TRUE(BytesCount == binary.size() || binary.empty());
if ((value >= std::numeric_limits<SignedInteger>::min()) &&
(value <= std::numeric_limits<SignedInteger>::max())) {
TestWriteInt<BytesCount, SignedInteger>(binary, value);
}
if ((value >= 0) && (value <= std::numeric_limits<UnsignedInteger>::max())) {
TestWriteUnsigned<BytesCount, UnsignedInteger>(binary, value);
}
}
// Runs all possible tests for given TestCase.
void TestReadAndWrite(const TestCase& tc) {
// test read (only correct types are allowed)
TestRead<1, int8_t, uint8_t>(tc.as1byte, tc.value);
TestRead<1, int16_t, uint16_t>(tc.as1byte, tc.value);
TestRead<1, int32_t, uint32_t>(tc.as1byte, tc.value);
TestRead<2, int16_t, uint16_t>(tc.as2bytes, tc.value);
TestRead<2, int32_t, uint32_t>(tc.as2bytes, tc.value);
TestRead<4, int32_t, uint32_t>(tc.as4bytes, tc.value);
// test write (only matching types are allowed)
TestWrite<1, int8_t, uint8_t>(tc.as1byte, tc.value);
TestWrite<2, int16_t, uint16_t>(tc.as2bytes, tc.value);
TestWrite<4, int32_t, uint32_t>(tc.as4bytes, tc.value);
}
TEST(encoding, TwosComplementary0) {
TestCase tc(0);
tc.as1byte.resize(1, 0);
tc.as2bytes.resize(2, 0);
tc.as4bytes.resize(4, 0);
TestReadAndWrite(tc);
}
// min 1-byte int
TEST(encoding, TwosComplementaryNeg128) {
TestCase tc(-128);
tc.as1byte = {0x80};
tc.as2bytes = {0xff, 0x80};
tc.as4bytes = {0xff, 0xff, 0xff, 0x80};
TestReadAndWrite(tc);
}
// min 2-bytes int
TEST(encoding, TwosComplementaryNeg32768) {
TestCase tc(-32768);
tc.as2bytes = {0x80, 0x00};
tc.as4bytes = {0xff, 0xff, 0x80, 0x00};
TestReadAndWrite(tc);
}
// min 4-bytes int
TEST(encoding, TwosComplementaryNeg2147483648) {
TestCase tc(-2147483648);
tc.as4bytes = {0x80, 0x00, 0x00, 0x00};
TestReadAndWrite(tc);
}
// max 1-byte int
TEST(encoding, TwosComplementary127) {
TestCase tc(127);
tc.as1byte = {0x7f};
tc.as2bytes = {0x00, 0x7f};
tc.as4bytes = {0x00, 0x00, 0x00, 0x7f};
TestReadAndWrite(tc);
}
// max 2-bytes int
TEST(encoding, TwosComplementary32767) {
TestCase tc(32767);
tc.as2bytes = {0x7f, 0xff};
tc.as4bytes = {0x00, 0x00, 0x7f, 0xff};
TestReadAndWrite(tc);
}
// max 4-bytes int
TEST(encoding, TwosComplementary2147483647) {
TestCase tc(2147483647);
tc.as4bytes = {0x7f, 0xff, 0xff, 0xff};
TestReadAndWrite(tc);
}
} // end of namespace
} // end of namespace ipp
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