set_copy_flags.c

static void set_copy_flags(struct Email *e, bool decode, bool decrypt,
                           CopyMessageFlags *cmflags, CopyHeaderFlags *chflags)
{
  *cmflags = MUTT_CM_NO_FLAGS;
  *chflags = CH_UPDATE_LEN;

  assert(!(decode & decrypt));

  const bool needs_decrypt = decrypt && (e->security & SEC_ENCRYPT);
  const bool want_pgp      = WithCrypto & APPLICATION_PGP;
  const bool is_pgp        = mutt_is_application_pgp(e->body) & SEC_ENCRYPT;
  const bool want_smime    = WithCrypto & APPLICATION_SMIME;
  const bool is_smime      = mutt_is_application_smime(e->body) & SEC_ENCRYPT;

  if (needs_decrypt && want_pgp && mutt_is_multipart_encrypted(e->body))
  {
      *chflags = CH_NONEWLINE | CH_XMIT | CH_MIME;
      *cmflags = MUTT_CM_DECODE_PGP;
  }
  else if (needs_decrypt && want_pgp && is_pgp)
  {
      *chflags = CH_XMIT | CH_MIME | CH_TXTPLAIN;
      *cmflags = MUTT_CM_DECODE | MUTT_CM_CHARCONV;
  }
  else if (needs_decrypt && want_smime && is_smime)
  {
      *chflags = CH_NONEWLINE | CH_XMIT | CH_MIME;
      *cmflags = MUTT_CM_DECODE_SMIME;
  }
  else if (decode)
  {
      *chflags = CH_XMIT | CH_MIME | CH_TXTPLAIN | CH_DECODE /* then decode RFC2047 headers, */;
      *cmflags = MUTT_CM_DECODE | MUTT_CM_CHARCONV;
      if (C_CopyDecodeWeed)
      {
        *chflags |= CH_WEED; /* and respect $weed. */
        *cmflags |= MUTT_CM_WEED;
      }
  }
}