CODEWITHSUNDEEP
javabase64
Perez Sebastián
Perez Sebastián

Reputation: 89

Convert a bit to Base64 character

I need to convert a binary String ("110100", 52 in decimal) to its corresponding Base64 character, that I know is "0". Is any way in Java to do that? I was reading multiple base 64 guides but I cant reach the answer.

For clarification, the conversion table is here: https://www.lifewire.com/base64-encoding-overview-1166412 (Base64 Encoding Table section) I want having the 52, convert it to "0" char.

Thanks a lot.

Upvotes: 0

Views: 685

Answers (2)

leo277
leo277

Reputation: 439

Since a byte is 8 bits long and Base64 makes up its values by grabbing only 6 bits the simplest way I can think of is appending two characters at the beginning of your desired character and taking only the last character of the result:

String encode = String.format("00%s", (char) Integer.parseInt("110100", 2));
String encoded = new String(Base64.getEncoder().encode(encode.getBytes()));
System.out.println(encoded.charAt(encoded.length() - 1));
// Prints: 0

Upvotes: 1

Deadron
Deadron

Reputation: 5289

You first need to convert your binary string into a byte array. There are a number of posts on how to accomplish this but in pseudo code it would look like the following.

  Read up to 4 characters;

  Byte.parseByte(chars, 2);

  Append to byte array;

Then you can use Base64.Encoder to encode the bytes.

Upvotes: 0

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