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// Copyright 2017 The Chromium OS 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 "bsdiff/split_patch_writer.h"
#include <memory>
#include <vector>
#include <gtest/gtest.h>
#include "bsdiff/fake_patch_writer.h"
#include "bsdiff/test_utils.h"
namespace bsdiff {
class SplitPatchWriterTest : public testing::Test {
protected:
void SetUpForSize(size_t num_chunks,
uint64_t new_chunk_size,
size_t new_size) {
fake_patches_.resize(num_chunks);
std::vector<PatchWriterInterface*> patches;
for (auto& fake_patch : fake_patches_)
patches.push_back(&fake_patch);
patch_writer_.reset(new SplitPatchWriter(new_chunk_size, patches));
EXPECT_TRUE(patch_writer_->Init(new_size));
}
std::vector<FakePatchWriter> fake_patches_;
std::unique_ptr<SplitPatchWriter> patch_writer_;
};
TEST_F(SplitPatchWriterTest, InvalidNumberOfPatchesForSizeTest) {
FakePatchWriter p;
std::vector<PatchWriterInterface*> patches = {&p};
patch_writer_.reset(new SplitPatchWriter(10, patches));
// We should have pass two patches.
EXPECT_FALSE(patch_writer_->Init(15));
}
// A single empty patch is allowed.
TEST_F(SplitPatchWriterTest, NonSplitEmptyPatchTest) {
SetUpForSize(1, 100, 0);
EXPECT_TRUE(patch_writer_->Close());
EXPECT_TRUE(fake_patches_[0].entries().empty());
}
// Leaving patches at the end that are empty is considered an error.
TEST_F(SplitPatchWriterTest, NotAllPatchesWrittenErrorTest) {
SetUpForSize(2, 100, 200);
// We write less than the amount needed for two patches, which should fail.
EXPECT_FALSE(patch_writer_->Close());
}
TEST_F(SplitPatchWriterTest, MissingDiffBytesErrorTest) {
SetUpForSize(2, 10, 20);
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(15, 5, 0)));
std::vector<uint8_t> zeros(20, 0);
// We write 12 diff bytes instead of the expected 15. This should fail on
// Close().
EXPECT_TRUE(patch_writer_->WriteDiffStream(zeros.data(), 12));
EXPECT_TRUE(patch_writer_->WriteExtraStream(zeros.data(), 5));
EXPECT_FALSE(patch_writer_->Close());
}
TEST_F(SplitPatchWriterTest, MissingExtraBytesErrorTest) {
SetUpForSize(2, 10, 20);
std::vector<uint8_t> zeros(20, 0);
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(5, 15, -5)));
EXPECT_TRUE(patch_writer_->WriteDiffStream(zeros.data(), 5));
// We write a little less than the expected 15. This operation should succeed,
// since we could write the rest later.
EXPECT_TRUE(patch_writer_->WriteExtraStream(zeros.data(), 10));
EXPECT_FALSE(patch_writer_->Close());
}
// Test all sort of corner cases when splitting the ControlEntry across multiple
// patches
TEST_F(SplitPatchWriterTest, SplitControlAcrossSeveralPatchesTest) {
SetUpForSize(4, 10, 40);
// The middle control entry would be split in tree different patches.
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(5, 1, -5)));
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(4, 0, -4)));
// old_pos at this point is 0. This is the end of the first patch.
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(6, 0, -1)));
// old_pos at this point is 5.
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(1, 18, 2)));
// old_pos at this point is 8.
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(1, 0, 1)));
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(4, 0, -5)));
std::vector<uint8_t> zeros(40, 0);
EXPECT_TRUE(
patch_writer_->WriteDiffStream(zeros.data(), 5 + 4 + 6 + 1 + 1 + 4));
EXPECT_TRUE(patch_writer_->WriteExtraStream(zeros.data(), 1 + 18));
EXPECT_TRUE(patch_writer_->Close());
EXPECT_EQ((std::vector<ControlEntry>{
ControlEntry(5, 1, -5),
ControlEntry(4, 0, 0), // (4, 0, -4) but the -4 is not needed.
}),
fake_patches_[0].entries());
EXPECT_EQ((std::vector<ControlEntry>{
// No need for dummy entry because the old_pos is already at 0.
ControlEntry(6, 0, -1),
ControlEntry(1, 3, 0), // the first part of (1, 18, 2)
}),
fake_patches_[1].entries());
EXPECT_EQ((std::vector<ControlEntry>{
// No need for dummy entry because the first entry is all in
// the extra stream and this is the last entry.
ControlEntry(0, 10, 0), // the middle part of (1, 18, 2)
}),
fake_patches_[2].entries());
EXPECT_EQ((std::vector<ControlEntry>{
// No need for dummy entry because the first entry is all in
// the extra stream, so use that.
ControlEntry(0, 5, 8), // the last part of (1, 18, 2), plus the
// old_pos 5. 8 = 1 + 2 + 5.
ControlEntry(1, 0, 1), // (1, 0, 1) copied
ControlEntry(4, 0, 0), // (4, 0, -5) ignoring the offset.
}),
fake_patches_[3].entries());
for (size_t i = 0; i < fake_patches_.size(); ++i) {
EXPECT_EQ(10U, fake_patches_[i].new_size()) << "where i = " << i;
}
}
TEST_F(SplitPatchWriterTest, WriteStreamsAfterControlAcrossPatchesTest) {
std::vector<uint8_t> numbers(40);
for (size_t i = 0; i < numbers.size(); ++i)
numbers[i] = 'A' + i;
SetUpForSize(4, 10, 40);
// The sequence is 15 diff, 10 extra, 15 diff.
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(15, 10, 0)));
EXPECT_TRUE(patch_writer_->AddControlEntry(ControlEntry(15, 0, 0)));
// Numbers [0, 30) for the diff stream, and [30, 40) for the extra stream.
EXPECT_TRUE(patch_writer_->WriteDiffStream(numbers.data(), 30));
EXPECT_TRUE(patch_writer_->WriteExtraStream(numbers.data() + 30, 10));
EXPECT_TRUE(patch_writer_->Close());
EXPECT_EQ(std::vector<uint8_t>(numbers.begin(), numbers.begin() + 10),
fake_patches_[0].diff_stream());
EXPECT_TRUE(fake_patches_[0].extra_stream().empty());
// 5 diff, then 5 extra.
EXPECT_EQ(std::vector<uint8_t>(numbers.begin() + 10, numbers.begin() + 15),
fake_patches_[1].diff_stream());
EXPECT_EQ(std::vector<uint8_t>(numbers.begin() + 30, numbers.begin() + 35),
fake_patches_[1].extra_stream());
// 5 extra, then 5 diff.
EXPECT_EQ(std::vector<uint8_t>(numbers.begin() + 15, numbers.begin() + 20),
fake_patches_[2].diff_stream());
EXPECT_EQ(std::vector<uint8_t>(numbers.begin() + 35, numbers.begin() + 40),
fake_patches_[2].extra_stream());
EXPECT_EQ(std::vector<uint8_t>(numbers.begin() + 20, numbers.begin() + 30),
fake_patches_[3].diff_stream());
EXPECT_TRUE(fake_patches_[3].extra_stream().empty());
}
} // namespace bsdiff
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