May 2022
Beginner to intermediate
756 pages
21h 30m
Korean
book
HTTP 완벽 가이드
by David Gourlry, Brian Totty, Lee Eung Jun, Sang -Il Jeong, Anshu Agarwal, Seilu Reddy, Marjorie Sayre
Content preview from HTTP 완벽 가이드
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663
부록 E base-64 인코딩
The Definitive Guide
E.3
Base
-
64
패딩
Base-64 인코딩은 일련의 8비트 바이트들을 받아서 그 비트 스트림을 6비트 덩어
리로 조각낸다. 그 일련의 비트들이 고르게 6비트 조각으로 나뉘는 일은 별로 없다.
6비트 조각으로 고르게 나뉘지 않았다면, 그 길이를 24비트(6비트와 8비트의 최소
공배수)로 만들고 남은 공간은 0비트로 채운다.
패딩된 비트 문자열을 인코딩할 때, 완전히 패딩된(원 데이터에서의 어떤 비트도
포함하지 않은) 6비트의 그룹은 특별한 65번째 기호인 “=”로 표현된다. 만약 6비트
의 그룹이 부분적으로 패딩되었다면, 패딩 비트들은 모두 0으로 설정된다.
표 E-2는 패딩의 예를 보여주고 있다. 초기 입력 문자열 “a:a”의 길이는 3바이트,
즉 24비트이다. 24는 6과 8의 배수이므로 패딩은 필요하지 않다. base-64 인코딩한
결과는 문자열 “YTph”이다.
입력 데이터 이진 수열(패딩은 “
x
”로 표현되어 있다) 인코딩된 데이터
a
:
a 011000
010011
101001
100001 YTph
a
:
aa 011000
010011
101001
100001
011000
01xxxx
xxxxxx
xxxxxx YTphYQ
==
a
:
aaa 011000
010011
101001
100001 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.