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Move base64 encode to a function

master
Benoît 2020-04-13 17:39:08 +02:00
parent a1510a1b12
commit e588ed13aa
1 changed files with 58 additions and 49 deletions
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107
set1/chal1/src/main.rs
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@ -5,11 +5,6 @@
////
use std::env;
use std::convert::TryInto;
static BASE64_TABLE: &'static [char] = &['A','B','C','D','E','F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V' ,'W' ,'X' ,'Y' ,'Z',
'a','b','c','d','e','f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v' ,'w' ,'x' ,'y' ,'z',
'0','1','2','3','4','5', '6', '7', '8', '9', '+', '/'];
/// Convert Hex String to char
///
@ -23,6 +18,63 @@ fn hex_to_char(s: &str) -> Result<char, std::num::ParseIntError> {
u8::from_str_radix(s, 16).map(|n| n as char)
}
/// Encode a Vector of bytes to Base64 and return the base 64 String
fn base64_encode(input: &Vec<u8>) -> String {
static BASE64_TABLE: &'static [char] = &['A','B','C','D','E','F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O',
'P', 'Q', 'R', 'S', 'T', 'U', 'V',
'W' ,'X' ,'Y' ,'Z',
'a','b','c','d','e','f', 'g', 'h',
'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v',
'w' ,'x' ,'y' ,'z',
'0','1','2','3','4','5', '6', '7',
'8', '9', '+', '/'];
let mut output = String::new();
for j in (0..input.len()).step_by(3) {
let mut pad = 0;
let mut arr = [0u8;4];
arr[0] = 0;
for i in 0..3 {
if i+j == input.len() {
arr[i+1] = 0;
pad = 1;
} else if i+j > input.len() {
arr[i+1] = 0;
pad = 2;
} else {
arr[i+1] = input[i+j];
}
}
let tmp = u32::from_be_bytes(arr);
let tmp1 = (tmp>>18) & 0x3F;
let tmp2 = (tmp>>12) & 0x3F;
output.push(BASE64_TABLE[tmp1 as usize]);
output.push(BASE64_TABLE[tmp2 as usize]);
if pad == 2 {
output.push_str("==");
break
} else {
let tmp3 = (tmp>>6) & 0x3F;
output.push(BASE64_TABLE[tmp3 as usize]);
}
if pad == 1 {
output.push_str("=");
break
} else {
let tmp4 = (tmp) & 0x3F;
output.push(BASE64_TABLE[tmp4 as usize]);
}
}
output
}
fn main() {
let mut input_str = String::new();
let args: Vec<String> = env::args().collect();
@ -51,50 +103,7 @@ fn main() {
.map(|i| u8::from_str_radix(i, 16).unwrap())
.collect();
// TODO !
// TODO: Make not ugly and move to function b64_encode(Vec<u8>) -> str
// TODO !
let mut output = String::new();
for j in (0..hex.len()).step_by(3) {
let mut pad = 0;
let mut arr = [0u8;4];
arr[0] = 0;
for i in 0..3 {
if i+j == hex.len() {
arr[i+1] = 0;
pad = 1;
} else if i+j > hex.len() {
arr[i+1] = 0;
pad = 2;
} else {
arr[i+1] = hex[i+j];
}
}
let tmp = u32::from_be_bytes(arr);
let tmp1:usize = ((tmp>>18) & 0x3F).try_into().unwrap();
let tmp2:usize = ((tmp>>12) & 0x3F).try_into().unwrap();
output.push(BASE64_TABLE[tmp1]);
output.push(BASE64_TABLE[tmp2]);
if pad == 2 {
output.push_str("==");
break
} else {
let tmp3:usize = ((tmp>>6) & 0x3F).try_into().unwrap();
output.push(BASE64_TABLE[tmp3]);
}
if pad == 1 {
output.push_str("=");
break
} else {
let tmp4:usize = ((tmp) & 0x3F).try_into().unwrap();
output.push(BASE64_TABLE[tmp4]);
}
}
let output = base64_encode(&hex);
println!("→ Input string is « {} »", input);
println!("→ Hex String to ASCII « {} »", &input_str);