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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/zucchini/rel32_utils.h"
#include <stdint.h>
#include <memory>
#include <vector>
#include "base/optional.h"
#include "base/test/gtest_util.h"
#include "components/zucchini/address_translator.h"
#include "components/zucchini/image_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace zucchini {
namespace {
// A trivial AddressTranslator that applies constant shift.
class TestAddressTranslator : public AddressTranslator {
public:
TestAddressTranslator(offset_t image_size, rva_t rva_begin) {
DCHECK_GE(rva_begin, 0U);
CHECK_EQ(AddressTranslator::kSuccess,
Initialize({{0, image_size, rva_begin, image_size}}));
}
};
// Checks that |reader| emits and only emits |expected_refs|, in order.
void CheckReader(const std::vector<Reference>& expected_refs,
ReferenceReader* reader) {
for (Reference expected_ref : expected_refs) {
auto ref = reader->GetNext();
EXPECT_TRUE(ref.has_value());
EXPECT_EQ(expected_ref, ref.value());
}
EXPECT_EQ(base::nullopt, reader->GetNext()); // Nothing should be left.
}
} // namespace
TEST(Rel32UtilsTest, Rel32ReaderX86) {
constexpr offset_t kTestImageSize = 0x00100000U;
constexpr rva_t kRvaBegin = 0x00030000U;
TestAddressTranslator translator(kTestImageSize, kRvaBegin);
// For simplicity, test data is not real X86 machine code. We are only
// including rel32 targets, without the full instructions.
std::vector<uint8_t> bytes = {
0xFF, 0xFF, 0xFF, 0xFF, // 00030000: (Filler)
0xFF, 0xFF, 0xFF, 0xFF, // 0003000C: (Filler)
0x04, 0x00, 0x00, 0x00, // 00030008: 00030010
0xFF, 0xFF, 0xFF, 0xFF, // 0003000C: (Filler)
0x00, 0x00, 0x00, 0x00, // 00030010: 00030014
0xFF, 0xFF, 0xFF, 0xFF, // 00030014: (Filler)
0xF4, 0xFF, 0xFF, 0xFF, // 00030018: 00030010
0xE4, 0xFF, 0xFF, 0xFF, // 0003001C: 00030004
};
ConstBufferView buffer(bytes.data(), bytes.size());
// Specify rel32 locations directly, instead of parsing.
std::vector<offset_t> rel32_locations = {0x0008U, 0x0010U, 0x0018U, 0x001CU};
// Generate everything.
Rel32ReaderX86 reader1(buffer, 0x0000U, 0x0020U, &rel32_locations,
translator);
CheckReader({{0x0008U, 0x0010U},
{0x0010U, 0x0014U},
{0x0018U, 0x0010U},
{0x001CU, 0x0004U}},
&reader1);
// Exclude last.
Rel32ReaderX86 reader2(buffer, 0x0000U, 0x001CU, &rel32_locations,
translator);
CheckReader({{0x0008U, 0x0010U}, {0x0010U, 0x0014U}, {0x0018U, 0x0010U}},
&reader2);
// Only find one.
Rel32ReaderX86 reader3(buffer, 0x000CU, 0x0018U, &rel32_locations,
translator);
CheckReader({{0x0010U, 0x0014U}}, &reader3);
}
TEST(Rel32UtilsTest, Rel32WriterX86) {
constexpr offset_t kTestImageSize = 0x00100000U;
constexpr rva_t kRvaBegin = 0x00030000U;
TestAddressTranslator translator(kTestImageSize, kRvaBegin);
std::vector<uint8_t> bytes(32, 0xFF);
MutableBufferView buffer(bytes.data(), bytes.size());
Rel32WriterX86 writer(buffer, translator);
writer.PutNext({0x0008U, 0x0010U});
EXPECT_EQ(0x00000004U, buffer.read<uint32_t>(0x08)); // 00030008: 00030010
writer.PutNext({0x0010U, 0x0014U});
EXPECT_EQ(0x00000000U, buffer.read<uint32_t>(0x10)); // 00030010: 00030014
writer.PutNext({0x0018U, 0x0010U});
EXPECT_EQ(0xFFFFFFF4U, buffer.read<uint32_t>(0x18)); // 00030018: 00030010
writer.PutNext({0x001CU, 0x0004U});
EXPECT_EQ(0xFFFFFFE4U, buffer.read<uint32_t>(0x1C)); // 0003001C: 00030004
EXPECT_EQ(std::vector<uint8_t>({
0xFF, 0xFF, 0xFF, 0xFF, // 00030000: (Filler)
0xFF, 0xFF, 0xFF, 0xFF, // 00030004: (Filler)
0x04, 0x00, 0x00, 0x00, // 00030008: 00030010
0xFF, 0xFF, 0xFF, 0xFF, // 0003000C: (Filler)
0x00, 0x00, 0x00, 0x00, // 00030010: 00030014
0xFF, 0xFF, 0xFF, 0xFF, // 00030014: (Filler)
0xF4, 0xFF, 0xFF, 0xFF, // 00030018: 00030010
0xE4, 0xFF, 0xFF, 0xFF, // 0003001C: 00030004
}),
bytes);
}
} // namespace zucchini
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