Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 1 | // Copyright 2015 The Chromium OS Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Alex Deymo | ddf9db5 | 2017-03-02 16:10:41 -0800 | [diff] [blame] | 5 | #include "bsdiff/bsdiff.h" |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 6 | |
| 7 | #include <gtest/gtest.h> |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 8 | #include <algorithm> |
| 9 | #include <random> |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 10 | #include <string> |
| 11 | #include <vector> |
| 12 | |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 13 | #include "bsdiff/fake_patch_writer.h" |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 14 | |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 15 | namespace { |
| 16 | |
| 17 | // Generate deterministic random data in the output buffer. The buffer must be |
| 18 | // already allocated with the desired size. The data generated depends on the |
| 19 | // selected size. |
| 20 | void GenerateRandomBuffer(std::vector<uint8_t>* buffer) { |
| 21 | std::minstd_rand prng(1234 + buffer->size()); |
| 22 | std::generate(buffer->begin(), buffer->end(), prng); |
| 23 | } |
| 24 | |
| 25 | } // namespace |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 26 | |
Alex Deymo | 20891f9 | 2015-10-12 17:28:04 -0700 | [diff] [blame] | 27 | namespace bsdiff { |
| 28 | |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 29 | class BsdiffTest : public testing::Test { |
| 30 | protected: |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 31 | BsdiffTest() = default; |
| 32 | ~BsdiffTest() override = default; |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 33 | |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 34 | void RunBsdiff() { |
| 35 | EXPECT_EQ(0, bsdiff(old_file_.data(), old_file_.size(), new_file_.data(), |
| 36 | new_file_.size(), &patch_writer_, nullptr)); |
| 37 | } |
| 38 | |
| 39 | std::vector<uint8_t> old_file_; |
| 40 | std::vector<uint8_t> new_file_; |
| 41 | FakePatchWriter patch_writer_; |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 42 | }; |
| 43 | |
| 44 | // Check that a file with no changes has a very small patch (no extra data). |
| 45 | TEST_F(BsdiffTest, EqualEmptyFiles) { |
| 46 | // Empty old and new files. |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 47 | RunBsdiff(); |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 48 | |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 49 | // No entries should be generated on an empty new file. |
| 50 | EXPECT_TRUE(patch_writer_.entries().empty()); |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | TEST_F(BsdiffTest, EqualSmallFiles) { |
Alex Deymo | c0461f0 | 2017-09-22 15:05:42 +0200 | [diff] [blame] | 54 | std::string some_text = "Hello world!"; |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 55 | old_file_.insert(old_file_.begin(), some_text.begin(), some_text.end()); |
| 56 | new_file_.insert(new_file_.begin(), some_text.begin(), some_text.end()); |
| 57 | RunBsdiff(); |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 58 | |
Alex Deymo | fb3b632 | 2017-09-27 14:28:54 +0200 | [diff] [blame^] | 59 | EXPECT_EQ(1U, patch_writer_.entries().size()); |
| 60 | ControlEntry entry = patch_writer_.entries()[0]; |
| 61 | EXPECT_EQ(some_text.size(), entry.diff_size); |
| 62 | EXPECT_EQ(0U, entry.extra_size); |
| 63 | } |
| 64 | |
| 65 | TEST_F(BsdiffTest, FileWithSmallErrorsTest) { |
| 66 | old_file_.resize(100); |
| 67 | GenerateRandomBuffer(&old_file_); |
| 68 | new_file_ = old_file_; |
| 69 | // Break a few bytes somewhere in the middle. |
| 70 | new_file_[20]++; |
| 71 | new_file_[30] += 2; |
| 72 | new_file_[31] += 2; |
| 73 | |
| 74 | RunBsdiff(); |
| 75 | |
| 76 | // We expect that the result has only one entry with all in the diff stream |
| 77 | // since the two files are very similar. |
| 78 | EXPECT_EQ(1U, patch_writer_.entries().size()); |
| 79 | ControlEntry entry = patch_writer_.entries()[0]; |
| 80 | EXPECT_EQ(100U, entry.diff_size); |
| 81 | EXPECT_EQ(0U, entry.extra_size); |
Alex Deymo | a5cff22 | 2015-04-08 14:10:30 -0700 | [diff] [blame] | 82 | } |
Alex Deymo | 20891f9 | 2015-10-12 17:28:04 -0700 | [diff] [blame] | 83 | |
| 84 | } // namespace bsdiff |