Hi cryptoz,
2016/6/9 Thu 15:53:05 UTC+9 cryptoz wrote:
> I have followed instructions on the Internet to edit gpg encrypted text file
> transparently. It almost works, but the file format is messed up for gpg
> files.
>
> OS: Windows 10.
> vim version: 7.4.1023 and 7.4.1721 (tried both)
>
> Problems:
>
> Suppose I have a file a.txt. It has only one character in it (say, 'a'). The
> file has three bytes:
>
> 00000000: 61 0d 0a
>
> If I encrypted the file with gpg without armor, the output file has hundreds
> of binary data. When I opened the gpg file with vim, there is an ^M at the
> end of the line.
>
> The fileformats is set to dos,unix and fileformat (detected) is dos.
>
> If I use armored file (.asc), there is no issue.
>
> The script I put in _vimrc to open *.gpg,*.asc files is similar to what I
> got from http://vim.wikia.com/wiki/Encryption
>
> I understand correctly, the steps are:
>
> 1. set bin option before read the file.
> 2. read the file into buffer.
> 3. call gpg to decrypt the buffer.
> 4. set nobin option.
>
> I am not sure when fileformat is detected during this process. I tried to set
> fileformat to dos in each step, it did not work.
>
> The problem could be the fileformat detection is done in 2. Since it is a
> binary file, fileformat is set to unix. In step 3, when decrypted text is
> placed back in buffer, there is ^M at the end of each line because fileformat
> is already set to unix.
>
> I would think a better way to handle similar situations is add a user
> configurable filter to convert the stream read from the file into another
> format (e.g., decryption, encoding) and another filter one for writing.
>
> Thanks.
I see a similar problem when I use a setting written in `:help hex-editing`:
augroup Binary
au!
au BufReadPre *.bin let &bin=1
au BufReadPost *.bin if &bin | %!xxd
au BufReadPost *.bin set ft=xxd | endif
au BufWritePre *.bin if &bin | %!xxd -r
au BufWritePre *.bin endif
au BufWritePost *.bin if &bin | %!xxd
au BufWritePost *.bin set nomod | endif
augroup END
When I open a *.bin file on Windows with this setting, each line ends with ^M.
The following setting seems to fix the problem:
augroup Binary
au!
au BufReadPre *.bin let &l:bin=1
au BufReadPost *.bin if &bin | setlocal nobin nofixeol ff=unix | %!xxd
au BufReadPost *.bin setlocal ft=xxd | endif
au BufWritePre *.bin if &ft=="xxd" | setlocal bin | %!xxd -r
au BufWritePre *.bin endif
au BufWritePost *.bin if &ft=="xxd" | setlocal nobin | %!xxd
au BufWritePost *.bin setlocal nomod | endif
augroup END
(Sorry, not tested well.)
Maybe we need `set nobin` before reading from a filter and `set bin` before
writing to a filter. 'fixeol' and 'ff' should be also adjusted properly.
('fenc' should be also adjusted?)
Regards,
Ken Takata
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