Base64 encode data

From Rosetta Code
Base64 encode data is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Convert an array of bytes or binary string to the base64-encoding of that string and output that value. Use the icon for Rosetta Code as the data to convert.

ABAP[edit]

DATA: li_client  TYPE REF TO if_http_client,
lv_encoded TYPE string,
lv_data TYPE xstring.
 
 
cl_http_client=>create_by_url(
EXPORTING
url = 'http://rosettacode.org/favicon.ico'
IMPORTING
client = li_client ).
 
li_client->send( ).
li_client->receive( ).
 
lv_data = li_client->response->get_data( ).
 
CALL FUNCTION 'SSFC_BASE64_ENCODE'
EXPORTING
bindata = lv_data
IMPORTING
b64data = lv_encoded.
 
WHILE strlen( lv_encoded ) > 100.
WRITE: / lv_encoded(100).
lv_encoded = lv_encoded+100.
ENDWHILE.
WRITE: / lv_encoded.
 
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAAAEABAAAAAAAAAAAAAAAAAAAA
...
AAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

ALGOL 68[edit]

This program is run on a modified Algol 68 Genie 2.8. That interpreter has some bugs, so it does not do binary tcp/ip requests, and I made patches/bugfixes to it in order to run this task.

 
STRING codes = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[@0];
 
PROC get web page = (STRING host, path) STRING:
BEGIN
STRING reply;
INT rc;
IF rc := tcp request (reply, host,
"GET /favicon.ico HTTP/1.0" + crlf +
"Host: rosettacode.org" + crlf +
crlf, 80);
rc = 0 THEN
SKIP #print (reply)#
ELSE print (strerror (rc))
FI;
IF rc = 0 AND grep in string ("^HTTP/[0-9.]+ 200", reply, NIL, NIL) = 0 THEN
INT p := 0;
FOR i TO UPB reply WHILE p = 0 DO
IF reply[i] = carriage return ANDF reply[i+1] = line feed AND reply[i+2] = carriage return AND reply[i+3] = line feed THEN
p := i
FI
OD;
IF p /= 0 THEN
STRING headers = reply[:p],
body = reply[p+4:];
body
ELSE
""
FI
ELSE
print (strerror (rc)); ""
FI
END;
 
 
PROC base64_encode = (STRING s) STRING:
BEGIN
STRING result := "";
BITS u;
FOR i BY 3 TO UPB s DO
u := BIN ABS s[i] SHL 16 OR
IF i+1 <= UPB s THEN BIN ABS s[i+1] SHL 8 OR
IF i+2 <= UPB s THEN BIN ABS s[i+2]
ELSE 16r0
FI
ELSE 16r0
FI;
 
result +:= codes[ABS (u SHR 18 AND 16r3f)] +
codes[ABS (u SHR 12 AND 16r3f)] +
(i + 1 <= UPB s | codes[ABS (u SHR 6 AND 16r3f)] | "=") +
(i + 2 <= UPB s | codes[ABS (u AND 16r3f)] | "=")
OD;
result
END;
 
 
CHAR line feed = REPR 10, carriage return = REPR 13;
STRING crlf = carriage return + line feed;
STRING host = "rosettacode.org";
 
STRING rosettacode icon = get web page (host, "http://rosettacode.org/favicon.ico");
STRING encoded icon = base64_encode (rosettacode icon);
print ((encoded icon, new line))
 
Output:
First 80 chars and last 80 chars of output
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAAAEAB
...
AAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

C[edit]

libresolv[edit]

Library: libresolv
(libresolv is included on most Unix-like systems)
#include <stdio.h>
#include <stdlib.h>
#include <resolv.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
 
int main() {
int fin = open("favicon.ico", O_RDONLY);
if (fin == -1)
return 1;
 
struct stat st;
if (fstat(fin, &st))
return 1;
 
void *bi = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fin, 0);
if (bi == MAP_FAILED)
return 1;
 
int outLength = ((st.st_size + 2) / 3) * 4 + 1;
char *outBuffer = malloc(outLength);
if (outBuffer == NULL)
return 1;
 
int encodedLength = b64_ntop(bi, st.st_size, outBuffer, outLength);
if (encodedLength < 0)
return 1;
 
puts(outBuffer);
 
free(outBuffer);
munmap(bi, st.st_size);
close(fin);
 
return 0;
}

Compile with

gcc -lresolv -o base64encode base64encode.c

Manual implementation[edit]

The following reads standard input and writes base64-encoded stream to standard output, e.g. ./a.out <some_random_file >/dev/null if you don't want to see the output. It gives identical output as the common base64 utility program, though much less efficiently.

#include <stdio.h>
#include <unistd.h>
 
typedef unsigned long UL;
 
int main(void)
{
const char *alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
unsigned char c[4];
UL u, len, w = 0;
 
do {
c[1] = c[2] = 0;
 
if (!(len = read(fileno(stdin), c, 3))) break;
u = (UL)c[0]<<16 | (UL)c[1]<<8 | (UL)c[2];
 
putchar(alpha[u>>18]);
putchar(alpha[u>>12 & 63]);
putchar(len < 2 ? '=' : alpha[u>>6 & 63]);
putchar(len < 3 ? '=' : alpha[u & 63]);
 
if (++w == 19) w = 0, putchar('\n');
} while (len == 3);
 
if (w) putchar('\n');
 
return 0;
}

C++[edit]

 
#include <iostream>
#include <fstream>
#include <vector>
 
typedef unsigned char byte;
using namespace std;
 
const unsigned m1 = 63 << 18, m2 = 63 << 12, m3 = 63 << 6;
 
class base64
{
public:
base64() { char_set = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; }
string encode( vector<byte> v )
{
string res;
unsigned d, a = 0, l = static_cast<unsigned>( v.size() );
while( l > 2 )
{
d = v[a++] << 16 | v[a++] << 8 | v[a++];
res.append( 1, char_set.at( ( d & m1 ) >> 18 ) );
res.append( 1, char_set.at( ( d & m2 ) >> 12 ) );
res.append( 1, char_set.at( ( d & m3 ) >> 6 ) );
res.append( 1, char_set.at( d & 63 ) );
l -= 3;
}
if( l == 2 )
{
d = v[a++] << 16 | v[a++] << 8;
res.append( 1, char_set.at( ( d & m1 ) >> 18 ) );
res.append( 1, char_set.at( ( d & m2 ) >> 12 ) );
res.append( 1, char_set.at( ( d & m3 ) >> 6 ) );
res.append( 1, '=' );
}
else if( l == 1 )
{
d = v[a++] << 16;
res.append( 1, char_set.at( ( d & m1 ) >> 18 ) );
res.append( 1, char_set.at( ( d & m2 ) >> 12 ) );
res.append( "==", 2 );
}
return res;
}
 
private:
string char_set;
};
 
int main( int argc, char* argv[] )
{
base64 b;
basic_ifstream<byte> f( "favicon.ico", ios::binary );
string r = b.encode( vector<byte>( ( istreambuf_iterator<byte>( f ) ), istreambuf_iterator<byte>() ) );
copy( r.begin(), r.end(), ostream_iterator<char>( cout ) );
return 0;
}
 
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAAAEAB
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAP///wCGiYcARkhHAL/CwAAmKScAam1rAOPm5ACgo6EAV1pYABcZ
...
AAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAA
AAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

C#[edit]

namespace RosettaCode.Base64EncodeData
{
using System;
using System.Net;
 
internal static class Program
{
private static void Main()
{
const string path = "http://rosettacode.org/favicon.ico";
 
byte[] input;
using (var client = new WebClient())
{
input = client.DownloadData(path);
}
 
var output = Convert.ToBase64String(input);
Console.WriteLine(output);
}
}
}

Output:

AAABAAIAEBAAAAAAAABoBQAAJgAAACAg...AAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

D[edit]

void main() {
import std.stdio, std.base64, std.net.curl, std.string;
 
const f = "http://rosettacode.org/favicon.ico".get.representation;
Base64.encode(f).writeln;
}
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAwqgIAADCjgUAACgAAAAQAAAAIAA...
AAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQ==

Delphi[edit]

program Base64EncodeData;
{$APPTYPE CONSOLE}
uses IdHTTP, IdCoderMIME;
 
var
lSrcString: string;
lHTTP: TIdHTTP;
begin
lHTTP := TIdHTTP.Create(nil);
try
lSrcString := lHTTP.Get('http://rosettacode.org/favicon.ico');
Writeln(TIdEncoderMIME.EncodeString(lSrcString));
finally
lHTTP.Free;
end;
end.

Elixir[edit]

data = File.read!("favicon.ico")
encoded = :base64.encode(data)
IO.puts encoded
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAAAEAB
...
AAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Erlang[edit]

-module(base64demo).
-export([main/0]).
 
main() ->
{ok, Data} = file:read_file("favicon.ico"),
Encoded = encode_library(Data),
io:format("~s",[Encoded]).
 
%% Demonstrating with the library function.
encode_library(Data) ->
base64:encode(Data).
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4F...AAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Go[edit]

Standard Library[edit]

package main
 
import (
"encoding/base64"
"fmt"
"io/ioutil"
"net/http"
)
 
func main() {
r, err := http.Get("http://rosettacode.org/favicon.ico")
if err != nil {
fmt.Println(err)
return
}
defer r.Body.Close()
d, err := ioutil.ReadAll(r.Body)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(base64.StdEncoding.EncodeToString(d))
}
Output:
AAABAAIAEBAAAAAAAABoBQAAJg ... AAAABAAAAAQAAAAE=

Manual implementation[edit]

// base64 encoding
// A port, with slight variations, of the C version found here:
// http://rosettacode.org/wiki/Base64#C (manual implementation)
//
// go build ; cat favicon.ico | ./base64
 
package main
 
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
)
 
const (
B64_CHUNK_SIZE = 76
)
 
type UL int64
 
// Our lookup table.
var alpha string = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
 
// Base64 encode a raw byte stream.
func B64Encode(raw []byte) (string, error) {
var buffer bytes.Buffer
var reader *bytes.Reader
var u UL // w UL
var length int
var chunk []byte
var err error
 
length = 3
reader = bytes.NewReader(raw)
chunk = make([]byte, 3)
 
for length == 3 {
 
chunk[1] = 0
chunk[2] = 0
 
length, err = reader.Read(chunk)
if err != nil || len(chunk) == 0 {
break
}
 
u = UL(chunk[0])<<16 | UL(chunk[1])<<8 | UL(chunk[2])
 
buffer.WriteString(string(alpha[u>>18]))
buffer.WriteString(string(alpha[u>>12&63]))
if length < 2 {
buffer.WriteString("=")
} else {
buffer.WriteString(string(alpha[u>>6&63]))
}
 
if length < 3 {
buffer.WriteString("=")
} else {
buffer.WriteString(string(alpha[u&63]))
}
}
 
return buffer.String(), nil
}
 
// Prettifies the base64 result by interspersing \n chars every B64_CHUNK_SIZE bytes.
// Even though there's a performance hit, i'd rather compose these.
func B64EncodePretty(raw []byte) (string, error) {
var buffer bytes.Buffer
encoded, err := B64Encode(raw)
if err != nil {
return "", err
}
length := len(encoded)
chunks := int(length/B64_CHUNK_SIZE) + 1
for i := 0; i < chunks; i++ {
chunk := i * B64_CHUNK_SIZE
end := chunk + B64_CHUNK_SIZE
if end > length {
end = chunk + (length - chunk)
}
buffer.WriteString(encoded[chunk:end] + "\n")
}
return buffer.String(), err
}
 
func main() {
contents, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatal("Error reading input: ", err)
}
encoded, err := B64EncodePretty(contents)
if err != nil {
log.Fatal("Error base64 encoding the input: ", err)
}
fmt.Printf("%s", encoded)
}
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAA
AEABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP///wCGiYcARkhHAL/CwAAmKScAam1rAOPm5ACgo6EA
...
AAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEA
AAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Haskell[edit]

This Haskell code is ported from the C solution (manual implementation) with slight variations.

 
-- | Base 64 Encoding.
-- A port, with slight variations, of the C version found here:
-- http://rosettacode.org/wiki/Base64#C (manual implementation)
--
-- ghc -Wall base64_encode.hs ; cat favicon.ico | ./base64_encode
 
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ViewPatterns #-}
 
module Main where
 
import Data.Bits
import Data.Char
 
import qualified Data.ByteString.Char8 as C
 
-- | alphaTable: Our base64 lookup table.
alphaTable :: C.ByteString
alphaTable = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
 
-- | b64Encode: Simple base64 encode function operating on normal C.ByteString's
b64Encode :: C.ByteString -> C.ByteString
b64Encode stream =
case C.null stream of
True -> C.empty
_ ->
alphaTable `C.index` (shiftR _u 18) `C.cons`
alphaTable `C.index` ((shiftR _u 12) .&. 63) `C.cons`
(if C.length chunk < 2 then '=' else alphaTable `C.index` ((shiftR _u 6) .&. 63)) `C.cons`
(if C.length chunk < 3 then '=' else alphaTable `C.index` (_u .&. 63)) `C.cons`
b64Encode (C.drop 3 stream)
where
chunk = C.take 3 stream
_u = u chunk
 
-- | b64EncodePretty: Intersperses \n every 76 bytes for prettier output
b64EncodePretty :: C.ByteString -> C.ByteString
b64EncodePretty = makePretty 76 . b64Encode
 
-- | u: base64 encoding magic
u :: C.ByteString -> Int
u chunk = fromIntegral result :: Int
where
result = foldl (.|.) 0 $ map (uncurry shiftL) $ zip (C.foldr (\c acc -> charToInteger c : acc) [] chunk) [16, 8, 0]
-- lazy foldl to fix formatting
 
-- | charToInteger: Convert a Char to an Integer
charToInteger :: Char -> Integer
charToInteger c = fromIntegral (ord c) :: Integer
 
-- | makePretty: Add new line characters throughout a character stream
makePretty :: Int -> C.ByteString -> C.ByteString
makePretty _ (C.uncons -> Nothing) = C.empty
makePretty by stream = first `C.append` "\n" `C.append` makePretty by rest
where (first, rest) = C.splitAt by stream
 
main :: IO ()
main = C.getContents >>= C.putStr . b64EncodePretty
 

J[edit]

Solution (standard library):
   load'convert/misc/base54'  NB. use 'tobase64'
Solution (handrolled):
   tobase64 =:  padB64~ b2B64 
padB64 =: , '=' #~ 0 2 1 i. 3 | #
b2B64 =: BASE64 {~ _6 #.\ (8#2) ,@:#: a.&i.
Example:
   load'web/gethttp'
76 {. tobase64 gethttp 'http://rosettacode.org/favicon.ico'
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAA

Java[edit]

Code ported from C solution. Can also use org.apache.commons.codec.binary.Base64 from Apache Commons Codec

package org.rosettacode;
 
import java.io.IOException;
import java.io.InputStream;
 
public class Base64
{
static String base64 (final InputStream is) throws IOException
{
final char[] alpha = { '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', '+', '/' };
final StringBuilder sb = new StringBuilder ();
final byte c[] = new byte[4];
long u;
int len;
int w = 0;
 
do
{
c[1] = c[2] = 0;
 
if ( (len = is.read (c, 0, 3)) == 0)
break;
u = ( ((long) c[0]) << 16) | ( ((long) c[1]) << 8) | c[2];
 
sb.append (alpha[(int) ( (u >> 18) & 63)]);
sb.append (alpha[(int) ( (u >> 12) & 63)]);
sb.append (len < 2 ? '=' : alpha[(int) (u >> 6) & 63]);
sb.append (len < 3 ? '=' : alpha[(int) u & 63]);
 
if (++w == 19)
{
w = 0;
sb.append ('\n');
}
}
while (len == 3);
 
if (w > 0)
sb.append ('\n');
 
return sb.toString ();
}
public static void main (final String[] args)
{
// Seems like this should work, but you'll get a 403 error (Forbidden)
// try (InputStream is = new URL("http://rosettacode.org/favicon.ico").openStream ())
 
// this will load the file if it's in the same package as the class itself
try (InputStream is = Base64.class.getResourceAsStream("favicon.ico"))
{
System.out.println (Base64.base64 (is));
}
catch (final IOException e)
{
e.printStackTrace (System.err);
}
}
}
 
AAABAAIAEBAAAAAAAABoBQ...QAAAAEAAAABAAAAAQAAAAE=

Java 8 version[edit]

import java.nio.file.*;
import java.util.Base64;
 
public class Base64Task {
 
public static void main(String[] args) throws Exception {
byte[] bytes = Files.readAllBytes(Paths.get("favicon.ico"));
String result = Base64.getEncoder().encodeToString(bytes);
System.out.println(result);
}
}
AAABAAIAEBAAAAAAAABoBQ...QAAAAEAAAABAAAAAQAAAAE=

JavaScript[edit]

(function(){//ECMAScript doesn't have an internal base64 function or method, so we have to do it ourselves, isn't that exciting?
function stringToArrayUnicode(str){for(var i=0,l=str.length,n=[];i<l;i++)n.push(str.charCodeAt(i));return n;}
function generateOnesByLength(n){//Attempts to generate a binary number full of ones given a length.. they don't redefine each other that much.
var x=0;
for(var i=0;i<n;i++){
x<<=1;x|=1;//I don't know if this is performant faster than Math.pow but seriously I don't think I'll need Math.pow, do I?
}
return x;
}
function paf(_offset,_offsetlength,_number){//I don't have any name for this function at ALL, but I will explain what it does, it takes an offset, a number and returns the base64 number and the offset of the next number.
//the next function will be used to extract the offset of the number..
var a=6-_offsetlength,b=8-a;//Oh god, 8 is HARDCODED! Because 8 is the number of bits in a byte!!!
//And 6 is the mini-byte used by wikipedia base64 article... at least on 2013.
//I imagine this code being read in 2432 or something, that probably won't happen..
return [_number&generateOnesByLength(b),b,(_offset<<a)|(_number>>b)];//offset & offsetlength & number
}
function toBase64(uint8array){//of bits, each value may not have more than 255 bits... //a normal "array" should work fine too..
//From 0x29 to 0x5a plus from 0x61 to 0x7A AND from 0x30 to 0x39
//Will not report errors if an array index has a value bigger than 255.. it will likely fail.
var a=[],i,output=[];
for(i=0x41;i<=0x5a;i++){//A-Z
a.push(String.fromCharCode(i));
}
for(i=0x61;i<=0x7A;i++){//a-z
a.push(String.fromCharCode(i));
}
for(i=0x30;i<=0x39;i++){//0-9
a.push(String.fromCharCode(i));
}
a.push('+','/');
var offset=0,offsetLength=0,x;
for(var i=0,l=uint8array.length;i<l;i++){
if(offsetLength==6){//if offsetlength is 6 that means that a whole offset is occupying the space of a byte, can you believe it.
offsetLength=0;
output.push(a[offset]);
offset=0;
i--;
continue;
}
x=paf(offset,offsetLength,uint8array[i]);
offset=x[0];
offsetLength=x[1];
output.push(a[x[2]]);
}
if(offsetLength){
if(offsetLength==6){
output.push(a[offset]);
}else{
var y=(6-offsetLength)/2;
x=paf(offset,offsetLength,0);
offset=x[0];
output.push(a[x[2]]);
switch (y){
case 2:output.push('=');//This thingy right here, you know.. the offsets also, no break statement;
case 1:output.push('=');break;
}
}
}
return output.join('');//You can change it so the result is an array instead!!!!
}
 
//Usage
 
return toBase64(stringToArrayUnicode("Nothing seems hard to the people who don't know what they're talking about."))
}())

Using btoa (HTML5)[edit]

Works with: Gecko
Works with: WebKit

Works with IE10 or higher.
HTML5 saves the day! introducing two methods to the DOM! These are btoa and atob, see spec

window.btoa("String to encode, etc..");//Will throw error if any unicode character is larger than 255 it's counterpart it's the window.atob
To make it.. just work, you could convert it to UTF-8 Manually or..

JSON.stringify it or.. encodeURIComponent it.

Using Node.js[edit]

Works with: Node.js
var http = require('http');
var options = {
host: 'rosettacode.org',
path: '/favicon.ico'
};
callback = function(response) {
var str = '';
response.on('data', function (chunk) {
str += chunk;
});
response.on('end', function () {
console.log(new Buffer(str).toString('base64'));//Base64 encoding right here.
});
}
 

Kotlin[edit]

// version 1.1.2
 
import java.io.File
import java.util.Base64
 
fun main(args: Array<String>) {
val path = "favicon.ico" // already downloaded to current directory
val bytes = File(path).readBytes()
val base64 = Base64.getEncoder().encodeToString(bytes)
println(base64)
}
Output:
AAABAAIAEBAAAAAAAABoBQ.....AAAAEAAAABAAAAAQAAAAE=

Lasso[edit]

local(
src = curl('http://rosettacode.org/favicon.ico'),
srcdata = #src->result
)
#srcdata->encodebase64
 
// or, in one movement:
curl('http://rosettacode.org/favicon.ico')->result->encodebase64

LiveCode[edit]

put URL "http://rosettacode.org/favicon.ico" into rosettaico
put base64encode(rosettaico)
 
Ouput
AAABAA...S0tLS0tLS0t...QAAAAE=

Lua[edit]

 
local dic = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
function encode( t, f )
local b1, b2, b3, b4
b1 = 1 + ( ( t & 0xfc0000 ) >> 18 )
b2 = 1 + ( ( t & 0x03f000 ) >> 12 )
b3 = 1 + ( ( t & 0x000fc0 ) >> 6 )
b4 = 1 + ( t & 0x00003f )
io.write( dic:sub( b1, b1 ), dic:sub( b2, b2 ) )
if f > 1 then io.write( dic:sub( b3, b3 ) ) else io.write( "=" ) end
if f > 2 then io.write( dic:sub( b4, b4 ) ) else io.write( "=" ) end
end
 
local i = assert( io.open( "favicon.ico", "rb" ) )
local iconData = i:read( "*all" )
local dataLen, s, t = #iconData, 1
while( dataLen > 2 ) do
t = ( iconData:sub( s, s ):byte() << 16 ); s = s + 1
t = t + ( iconData:sub( s, s ):byte() << 8 ); s = s + 1
t = t + ( iconData:sub( s, s ):byte() ); s = s + 1
dataLen = dataLen - 3
encode( t, 3 )
end
if dataLen == 2 then
t = ( iconData:sub( s, s ):byte() << 16 ); s = s + 1;
t = t + ( iconData:sub( s, s ):byte() << 8 ); s = s + 1;
encode( t, 2 )
elseif dataLen == 1 then
t = ( iconData:sub( s, s ):byte() << 16 ); s = s + 1;
encode( t, 1 )
end
print()
 
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAA
gAAAAAAEABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP///wCGiYcARkhHAL/CwAAmKScAam1r
...
AAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQ
AAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Mathematica / Wolfram Language[edit]

Print[ExportString[
Import["http://rosettacode.org/favicon.ico", "Text"], "Base64"]];

Very interesting results.

Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAA
AEABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP///wCGiYcARkhHAL/CwAAmKScAam1rAOPm5ACgo6EA
V1pYABcZGADO0c8AODs5AK2wrgBzdnQA6+7sAPz//QAAAwEAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
............................................................................
AOaFhYbu7zPmhYWF5oaGhoaGhoaGhoaGhoaGhoaFhekA/////wAAAAEAAAABAAAAAQAAAAEAAAAB
AAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEA
AAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Objective-C[edit]

Works with: Mac OS X version 10.6+
Works with: iOS version 4.0+
#import <Foundation/Foundation.h>
 
int main(int argc, const char *argv[]) {
@autoreleasepool {
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://rosettacode.org/favicon.ico"]];
NSLog(@"%@", [data base64Encoding]);
}
return 0;
}

Perl[edit]

#!perl
use strict;
use warnings;
use MIME::Base64;
open(my($fh), "<", "favicon.ico") or die;
local $/;
print encode_base64(<$fh>);
 
Output:

The first and last lines of output are:

AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgAAAAA
AAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Perl 6[edit]

sub MAIN {
my $buf = slurp("/tmp/favicon.ico", :bin);
say buf-to-Base64($buf);
}
 
my @base64map = 'A' .. 'Z', 'a' .. 'z', ^10, '+', '/';
 
sub buf-to-Base64($buf) {
join '', gather for $buf.list -> $a, $b = [], $c = [] {
my $triplet = ($a +< 16) +| ($b +< 8) +| $c;
take @base64map[($triplet +> (6 * 3)) +& 0x3F];
take @base64map[($triplet +> (6 * 2)) +& 0x3F];
if $c.elems {
take @base64map[($triplet +> (6 * 1)) +& 0x3F];
take @base64map[($triplet +> (6 * 0)) +& 0x3F];
}
elsif $b.elems {
take @base64map[($triplet +> (6 * 1)) +& 0x3F];
take '=';
}
else { take '==' }
}
}
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAA...QAAAAEAAAABAAAAAQAAAAE=

Phix[edit]

As this is a draft task, I've gone with the example from wp, for now. Pete Lomax (talk) 10:25, 11 September 2015 (UTC)

include builtins\base64.e
 
string s = "Man is distinguished, not only by his reason, but by this singular passion from "&
"other animals, which is a lust of the mind, that by a perseverance of delight "&
"in the continued and indefatigable generation of knowledge, exceeds the short "&
"vehemence of any carnal pleasure."
string e = encode_base64(s)
?e
?decode_base64(e)
Output:
TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlzIHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2YgdGhlIG1p
bmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGludWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRoZSBzaG9ydCB2ZWhl
bWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=
"Man is distinguished, not only by his reason, but by this singular passion from other animals, which is a lust of the mind, that by a perseverance of delight i
n the continued and indefatigable generation of knowledge, exceeds the short vehemence of any carnal pleasure."

PHP[edit]

<?php echo base64_encode(file_get_contents("http://rosettacode.org/favicon.ico"));/*1 liner*/  ?>

PicoLisp[edit]

(setq *Char64
(chop
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" ) )
(de encode64 (L)
(let? A (car L)
(make
(link (get *Char64 (inc (>> 2 A))))
(nond
((cadr L)
(link
(get *Char64 (inc (>> -4 (& A 3))))
'=
'= ) )
((caddr L)
(link
(get
*Char64
(inc
(|
(>> -4 (& A 3))
(>> 4 (cadr L)) ) ) )
(get
*Char64
(inc (>> -2 (& (cadr L) 15))) )
'= ) )
(NIL
(link
(get
*Char64
(inc
(|
(>> -4 (& A 3))
(>> 4 (cadr L)) ) ) )
(get
*Char64
(inc
(|
(>> -2 (& (cadr L) 15))
(>> 6 (caddr L)) ) ) )
(get *Char64 (inc (& (caddr L) 63))) ) ) ) ) ) )
(de base64 (S)
(let S (mapcar char (chop S))
(pack
(make
(while (cut 3 'S)
(chain (encode64 @)) ) ) ) ) )
(test
"cGxlYXN1cmUu"
(base64 "pleasure.") )
(test
"bGVhc3VyZS4="
(base64 "leasure.") )
(test
"ZWFzdXJlLg=="
(base64 "easure.") )
(test
"YXN1cmUu"
(base64 "asure.") )
(test
"c3VyZS4="
(base64 "sure.") )

PowerShell[edit]

 
[string]$iPath = "http://rosettacode.org/favicon.ico"
[byte[]]$bytes = @()
 
$client = New-Object -TypeName "System.Net.WebClient"
 
$bytes = $client.DownloadData($iPath)
 
$output = [Convert]::ToBase64String($bytes)
 
Write-Host "$($output[0..31] -join '')...$($output[-32..-1] -join '')"
 
Output:
AAABAAIAEBAAAAAAAABoBQAAJgAAACAg...AAABAAAAAQAAAAEAAAABAAAAAQAAAAE=

Python[edit]

import urllib
import base64
 
data = urllib.urlopen('http://rosettacode.org/favicon.ico').read()
print base64.b64encode(data)

(For me this gets the wrong data; the data is actually an error message. But still, it base-64 encodes it.)

Racket[edit]

 
#lang racket
(require net/url net/base64)
(base64-encode (call/input-url (string->url "http://rosettacode.org/favicon.ico")
get-pure-port port->bytes))
 

Output:

 
#"AAABAAIAEBAAAAAAAABoBQAA...AQAAAAE=\r\n"
 
==REXX==

Some computers   (or REXX implementations)   are limited in virtual memory, so the   chunk   size (below) is
specified as   20000   to show how the file   (if specified)   can be read in chunks instead of reading it whole.

A much higher value for   chunk   could be used for modern systems or implementations.

/*REXX program  converts  text  (from a file  or  the C.L.)  to a  base64  text string. */
parse arg iFID @ /*pbtaom optional arguments from the CL*/
if iFID=='' | iFID=="," then iFID='favicon.ico' /*Not specified? Then use the default.*/
chunk=20000 /*# of bytes to read a file at one time*/
/*If @ isn't a blank, then use CL text.*/
if @='' then do s=1 by chunk until y=='' /* " " is " " " " the file*/
y=charin(iFID, s, chunk) /*read a chunk of the file, assign to Y*/
@=@ || y /*append the chunk (Y) to the @ var*/
end /*s*/ /* [↑] read a chunk of the file ──► @ */
t=base64(@) /*convert the @ string to base 64.*/
say center(' input', 79, "─"); say @ /*show the header and the input text.*/
say center('base64', 79, "─"); say t /* " " " " " base64 " */
exit /*stick a fork in it, we're all done. */
/*──────────────────────────────────────────────────────────────────────────────────────*/
base64: procedure; parse arg Q; $= /*obtain input string; and nullify $. */
z= 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
 
do i=0 for 64 /*process each char in the Z string. */
 !.i=substr(z, i+1, 1) /*assign a char of Z to a  ! element*/
end /*i*/
 
b=x2b( c2x(Q) )0000000000000000 /*Q ──► binary, add some zero padding.*/
L=length(Q) * 8 /*compute Q's length (in bits). */
 
do j=1 by 6 to L /*traipse through bit string by six. */
_=x2d( b2x( substr(b, j, 6) )) /*compute index into the BASE64 table. */
$=$ || !._ /*append to $ (the output string). */
end /*j*/
/* [↓] maybe append equal signs to $. */
return $ || copies('=', 2 * (L//6==2) + (L//6==4) )

For the various outputs, several input texts from the Wikipedia article on   Base64   [1]   were used to demonstrate how padding works.

output   when using the input of:   , any carnal pleasure.
──────────────────────────────────── input─────────────────────────────────────
any carnal pleasure.
────────────────────────────────────base64─────────────────────────────────────
YW55IGNhcm5hbCBwbGVhc3VyZS4=
output   when using the input of:   , any carnal pleasure
──────────────────────────────────── input─────────────────────────────────────
any carnal pleasure
────────────────────────────────────base64─────────────────────────────────────
YW55IGNhcm5hbCBwbGVhc3VyZQ==
output   when using the input of:   , any carnal pleasur
──────────────────────────────────── input─────────────────────────────────────
any carnal pleasur
────────────────────────────────────base64─────────────────────────────────────
YW55IGNhcm5hbCBwbGVhc3Vy
output   when using the input of:   , any carnal pleasu
──────────────────────────────────── input─────────────────────────────────────
any carnal pleasu
────────────────────────────────────base64─────────────────────────────────────
YW55IGNhcm5hbCBwbGVhc3U=
output   when using the input of:   , any carnal pleas
──────────────────────────────────── input─────────────────────────────────────
any carnal pleas
────────────────────────────────────base64─────────────────────────────────────
YW55IGNhcm5hbCBwbGVhcw==

Ruby[edit]

require 'open-uri'
require 'base64'
 
puts Base64.encode64 open('http://rosettacode.org/favicon.ico') {|f| f.read}

Seed7[edit]

$ include "seed7_05.s7i";
include "gethttp.s7i";
include "encoding.s7i";
 
const proc: main is func
begin
writeln(toBase64(getHttp("rosettacode.org/favicon.ico")));
end func;

Sidef[edit]

var base64 = frequire('MIME::Base64');
 
var file = %f'favicon.ico';
file.open('<:raw', \var fh);
 
print base64.encode_base64(fh.slurp);

Tcl[edit]

Works with: Tcl version 8.6
package require Tcl 8.6
package require http
 
set tok [http::geturl http://rosettacode.org/favicon.ico]
set icondata [http::data $tok]
http::cleanup $tok
 
puts [binary encode base64 -maxlen 64 $icondata]

With older versions of Tcl, the base64 encoding is best supported via an external package:

Library: Tcllib (Package: base64)
package require base64
package require http
 
set tok [http::geturl http://rosettacode.org/favicon.ico]
set icondata [http::data $tok]
http::cleanup $tok
 
puts [base64::encode -maxlen 64 $icondata]

zkl[edit]

Using shared libraries for cURL and message hashing:

var MsgHash=Import("zklMsgHash"), Curl=Import("zklCurl");
 
icon:=Curl().get("http://rosettacode.org/favicon.ico"); //-->(Data(4,331),693,0)
icon=icon[0][icon[1],*]; // remove header
b64:=MsgHash.base64encode(icon);
b64.println();
b64.text.println();
Output:

Encoded to 72 characters per line

Data(4,920)
AAABAAIAEBAAAAAAAABoBQAAJgAAACAgAAAAAAAAqAgAAI4FAAAoAAAAEAAAACAAAAABAAgA
AAAAAEABAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP///wCGiYcARkhHAL/CwAAmKScAam1rAOPm
...
AAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAABAAAAAQAAAAEAAAAB
AAAAAQAAAAEAAAABAAAAAQAAAAE=