Anonymous user
Base64 decode data: Difference between revisions
→{{header|Ruby}}
Line 529:
To err is human, but to really foul things up you need a computer.
-- Paul R. Ehrlich
</pre>
=={{header|Rust}}==
<lang rust>use std::str;
const INPUT: &str = "VG8gZXJyIGlzIGh1bWFuLCBidXQgdG8gcmVhbGx5IGZvdWwgdGhpbmdzIHVwIHlvdSBuZWVkIGEgY29tcHV0ZXIuCiAgICAtLVBhdWwgUi5FaHJsaWNo";
const UPPERCASE_OFFSET: i8 = -65;
const LOWERCASE_OFFSET: i8 = 26 - 97;
const NUM_OFFSET: i8 = 52 - 48;
fn main() {
println!("Input: {}", INPUT);
let result = INPUT.chars()
.filter(|&ch| ch != '=') //Filter '=' chars
.map(|ch| { //Map char values using Base64 Characters Table
let ascii = ch as i8;
let convert = match ch {
'0' ... '9' => ascii + NUM_OFFSET,
'a' ... 'z' => ascii + LOWERCASE_OFFSET,
'A' ... 'Z' => ascii + UPPERCASE_OFFSET,
'+' => 62,
'/' => 63,
_ => panic!("Not a valid base64 encoded string")
};
format!("{:#08b}", convert)[2..].to_string() //convert indices to binary format and remove the two first digits
})
.collect::<String>() //concatenate the resulting binary values
.chars()
.collect::<Vec<char>>()
.chunks(8) //split into 8 character chunks
.map(|chunk| {
let num_str = chunk.iter().collect::<String>();
usize::from_str_radix(&num_str, 2).unwrap() as u8 //convert the binary string into its u8 value
})
.collect::<Vec<_>>();
let result = str::from_utf8(&result).unwrap(); //convert into UTF-8 string
println!("Output: {}", result);
}</lang>
{{out}}
<pre>
Input: VG8gZXJyIGlzIGh1bWFuLCBidXQgdG8gcmVhbGx5IGZvdWwgdGhpbmdzIHVwIHlvdSBuZWVkIGEgY29tcHV0ZXIuCiAgICAtLVBhdWwgUi5FaHJsaWNo
Output: To err is human, but to really foul things up you need a computer.
--Paul R.Ehrlich
</pre>
| |||