Merge "libsnapshot: Add a test case for recent decompress regression." into main

    },

    data: [

        "tools/testdata/cow_v2",

        "tools/testdata/incompressible_block",

    ],

    auto_gen_config: true,

    require_root: false,

    ASSERT_TRUE(reader.GetFooter(&footer));

}

TEST_F(CowTest, DecompressIncompressibleBlock) {

    auto fd = OpenTestFile("incompressible_block", O_RDONLY);

    ASSERT_GE(fd, 0);

    std::string original;

    ASSERT_TRUE(android::base::ReadFdToString(fd, &original)) << strerror(errno);

    ASSERT_EQ(original.size(), 4096);

    CowOptions options;

    options.compression = "gz";

    auto writer = CreateCowWriter(2, options, GetCowFd());

    ASSERT_NE(writer, nullptr);

    ASSERT_TRUE(writer->AddRawBlocks(0, original.data(), original.size()));

    ASSERT_TRUE(writer->Finalize());

    CowReader reader;

    ASSERT_TRUE(reader.Parse(cow_->fd));

    auto iter = reader.GetOpIter();

    ASSERT_NE(iter, nullptr);

    ASSERT_FALSE(iter->AtEnd());

    std::string block(original.size(), '\0');

    ASSERT_EQ(iter->Get()->data_length, 4096);

    ASSERT_TRUE(ReadData(reader, iter->Get(), block.data(), block.size()));

    for (size_t i = 0; i < block.size(); i++) {

        ASSERT_EQ(block[i], original[i]) << "mismatch at byte " << i;

    }

}

}  // namespace snapshot

}  // namespace android