I am using libzippp to compress/decompress data.

When trying to decompress an archive that is encrypted (using 7z, ZipCrypto or AES-256 does not matter), the function ZipEntry::readContent() returns -25 every time.

According to the comments inside the code, this is supposed to mean that zip_fopen_index() has failed, but clarifies nothing further. An idea was that since the archive is encrypted, zip_fopen_index_encrypted() should be called instead of zip_fopen_index(), but according to the documentation, zip_fopen_index_encrypted() should be called automatically if the archive is encrypted.

Here is a small code snippet that I am using:

int main(int argc, char** argv) {
   std::string destination = "C:\temp\temporary\";
   std::string source = "C:\temp\test.zip";

   libzippp::ZipArchive archive(source, "test");

   bool open = archive.open(libzippp::ZipArchive::ReadOnly);
   std::vector<libzippp::ZipEntry> entries = archive.getEntries();
   std::vector<libzippp::ZipEntry>::iterator it;
   libzippp::ZipEntry entry;

   std::string folder;
   std::string target;
   for (it = entries.begin(); it != entries.end(); ++it)
   {
      entry = *it;
      if (entry.isFile())
      {
         folder = destination.data() + std::filesystem::path(entry.getName()).parent_path().string();
         target = folder + "\" + std::filesystem::path(entry.getName()).filename().string();

         /* Create directory if it does not exist */
         if (!std::filesystem::exists(folder))
            std::filesystem::create_directories(folder);
         std::string testString = entry.readAsText();

         std::ofstream stream(target, std::ios::out | std::ios::binary);
         int returnCode = entry.readContent(stream);
         stream.close();
      }
   }
   archive.close();
   return 0;
}

returnCode will be set to -25 for each entry (only) if the archive is encrypted.

The strings destination, source as well as the password passed to the ZipArchive are setup for my example and will have to be adjusted.