diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc index c2055b7f5..779ef2fb9 100644 --- a/libziparchive/zip_archive.cc +++ b/libziparchive/zip_archive.cc @@ -573,6 +573,17 @@ static int32_t FindEntry(const ZipArchive* archive, const int ent, // Paranoia: Match the values specified in the local file header // to those specified in the central directory. + + // Verify that the central directory and local file header agree on the use of a trailing + // Data Descriptor. + if ((lfh->gpb_flags & kGPBDDFlagMask) != (cdr->gpb_flags & kGPBDDFlagMask)) { + ALOGW("Zip: gpb flag mismatch. expected {%04" PRIx16 "}, was {%04" PRIx16 "}", + cdr->gpb_flags, lfh->gpb_flags); + return kInconsistentInformation; + } + + // If there is no trailing data descriptor, verify that the central directory and local file + // header agree on the crc, compressed, and uncompressed sizes of the entry. if ((lfh->gpb_flags & kGPBDDFlagMask) == 0) { data->has_data_descriptor = 0; if (data->compressed_length != lfh->compressed_size diff --git a/libziparchive/zip_writer.cc b/libziparchive/zip_writer.cc index 2edf224b4..6d28bdb5e 100644 --- a/libziparchive/zip_writer.cc +++ b/libziparchive/zip_writer.cc @@ -479,7 +479,9 @@ int32_t ZipWriter::Finish() { for (FileEntry& file : files_) { CentralDirectoryRecord cdr = {}; cdr.record_signature = CentralDirectoryRecord::kSignature; - cdr.gpb_flags |= kGPBDDFlagMask; + if ((file.compression_method & kCompressDeflated) || !seekable_) { + cdr.gpb_flags |= kGPBDDFlagMask; + } cdr.compression_method = file.compression_method; cdr.last_mod_time = file.last_mod_time; cdr.last_mod_date = file.last_mod_date;