[Feature Request]: Adding a function to determine whether the metadata is encrypted

[ygqs250]

Feature description

Adding a function to determine whether the metadata is encrypted? Now bit7z can only use exceptions to determine whether the metadata is encrypted.

Additional context

No response

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[rikyoz]

Hi!

Thanks for the suggestion!

I've just pushed a commit (https://github.com/rikyoz/bit7z/commit/d19423420df7ab6da8bbf2b83076a25b224bafb9) that adds two static functions to the BitArchiveReader class:

template< typename T >
auto BitArchiveReader::isHeaderEncrypted( const Bit7zLibrary& lib,
                                          T&& in_archive,
                                          const BitInFormat& format ) -> bool;

template< typename T >
auto BitArchiveReader::isEncrypted( const Bit7zLibrary& lib,
                                    T&& in_archive,
                                    const BitInFormat& format ) -> bool;

They're template functions so that they can accept either a file path (string), a buffer, or a standard stream of the archive to be checked.

BitArchiveReader::isHeaderEncrypted checks whether the archive is fully encrypted (header included), and hence it needs a password to be opened.

BitArchiveReader::isEncrypted checks whether the archive contains only encrypted files, but can be opened without a password (plain headers).

These functions will be included in the stable version of bit7z v4.

[rikyoz]

Implemented in v4.0.0.