Re: How to encode ASCII text to BASE64 without last Line Feed character?

Am 2015-04-22 15:06, schrieb Igor Forca:
> Hi,
> I am using gVim 7.4 on Windows 7. I would like to encode ASCII text
> into BASE64 text.
>
> 1. First I have set code page to UTF-8 and file format to unix.
> :set encoding=utf-8
> :set fencoding=utf-8
> :set fileformat=unix
>
> 2. Then I have typed in text: Man
> This is the sample from: https://en.wikipedia.org/wiki/Base64#Examples
> 3. Saved to file: :w
> 4. Converted text from ASCII to BASE64:
> :%!base64
> and text Man is converted into:
> TWFuCg==
> This is not correct. Why? The mail logic: three ASCII character should
> be converted into 4 BASE64 characters, but I get 8 characters as
> BASE64 output.
>
> Man should be converted into:
> TWFu
>
> This can also be verified with: https://www.base64encode.org/ typing
> Man in top input box and click on Encode.
>
> What I suspect is that Vim is also converting Line Feed character (the
> last character in the line). Why? Type in:
> Man
> and execute command:
> :%!xxd and output is hex number of Man characters:
> 4d616e0a
>
> Where the meaning is:
> 4d=M
> 61=a
> 6e=n
> 0a=Line Feed
>
> Now I suspect that Man+(line_feed_character) is converted from ASCII
> to base64. This are 4 characters that can't be divided by 3, so two
> extra = characters are added to get 6 ASCII characters (6 can be
> divided by 3). Because of logic to get 4 base64 out of 3 input ASCII
> characters, so formula: 6 * 4 / 3 = 8 characters returned by Vim.
>
> If I am correct and Vim does include Line Feed character when
> converting text from ASCII to BASE64, then:
> a) Is there a way to convert from ASCII to BASE64 without line feed
> character.
> b) Is there a way to remove line feed character from end of line in
> Vim? So when converted it will not get included into conversion.

The easy way, if you never need more than a single line of input, then
simply filter through tr -d '\n'

Best,
Christian

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