Function save 

pub fn save(
    doc: &EditDoc<'_>,
    opts: &SaveOptions,
    out: &mut impl Write,
) -> Result<(), Error>

Write doc to out.

Errors

Error::EncryptedSaveUnsupported when the document declares /Encrypt but this reader never derived a key for it — an /Identity crypt filter, or a handler we opened as pdfrum_crypt::SecurityHandler::Identity — and remove_security was not set, because re-declaring a cipher over plaintext would produce a file nothing could open. And Error::Io when the sink refuses the bytes.

Damage in the input is not an error: an object that cannot be fetched is dropped from both the body and the cross-reference, exactly as the C++ writer drops it.