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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