| 55 | } |
| 56 | |
| 57 | generator::mwm_diff::DiffApplicationResult ApplyDiffVersion0(FileReader & oldReader, FileWriter & newWriter, |
| 58 | ReaderSource<FileReader> & diffFileSource, |
| 59 | base::Cancellable const & cancellable) |
| 60 | { |
| 61 | using generator::mwm_diff::DiffApplicationResult; |
| 62 | |
| 63 | std::vector<uint8_t> deflatedDiff(base::checked_cast<size_t>(diffFileSource.Size())); |
| 64 | diffFileSource.Read(deflatedDiff.data(), deflatedDiff.size()); |
| 65 | |
| 66 | using Inflate = coding::ZLib::Inflate; |
| 67 | Inflate inflate(Inflate::Format::ZLib); |
| 68 | std::vector<uint8_t> diffBuf; |
| 69 | inflate(deflatedDiff.data(), deflatedDiff.size(), back_inserter(diffBuf)); |
| 70 | |
| 71 | // Our bsdiff assumes that both the old mwm and the diff files are correct and |
| 72 | // does no checks when using its readers. |
| 73 | // Yet sometimes we observe corrupted files in the logs, and to avoid |
| 74 | // crashes from such files the exception-throwing version of MemReader is used here. |
| 75 | // |oldReader| is a FileReader so it throws exceptions too but we |
| 76 | // are more confident in the uncorrupted status of the old file because |
| 77 | // its checksum is compared to the one stored in the diff file. |
| 78 | MemReaderWithExceptions diffMemReader(diffBuf.data(), diffBuf.size()); |
| 79 | |
| 80 | auto const status = bsdiff::ApplyBinaryPatch(oldReader, newWriter, diffMemReader, cancellable); |
| 81 | |
| 82 | if (status == bsdiff::BSDiffStatus::CANCELLED) |
| 83 | { |
| 84 | LOG(LDEBUG, ("Diff application has been cancelled")); |
| 85 | return DiffApplicationResult::Cancelled; |
| 86 | } |
| 87 | |
| 88 | if (status == bsdiff::BSDiffStatus::OK) |
| 89 | return DiffApplicationResult::Ok; |
| 90 | |
| 91 | LOG(LERROR, ("Could not apply patch with bsdiff:", status)); |
| 92 | return DiffApplicationResult::Failed; |
| 93 | } |
| 94 | } // namespace |
| 95 | |
| 96 | namespace generator |