CODEWITHSUNDEEP
node.jsbuffer
jemiloii
jemiloii

Reputation: 25729

How do I manually replicate a Node.js buffer?

I have this buffer: <Buffer 0d 0a> and I am wondering how I can replicate it so I can test against it.

With <Buffer 00> I was able to do new Buffer([00]) but when I do new Buffer([0d 0a]) or new Buffer([0d, 0a]) I get an error.

_0d0a = new Buffer([0d 0a]);
                    ^
SyntaxError: Unexpected token ILLEGAL
    at Module._compile (module.js:439:25)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:906:3

Any help?

Update:

I need to create the buffer and not copy it as a stream I'm listening to sends the buffer I am looking for.

Upvotes: 1

Views: 1351

Answers (3)

deltab
deltab

Reputation: 2556

Those bytes are shown as numbers in hexadecimal. To enter them into JavaScript, you need to prefix them with 0x:

var CRLF = new Buffer([0x0d, 0x0a]);

Alternatively you can create a buffer from a string of hex:

var CRLF = new Buffer('0d0a', 'hex');

Note that this will throw an error (“TypeError: Invalid hex string”) if the string contains spaces or other characters, but you can remove those first:

var CRLF = new Buffer('0d 0a'.replace(/\W/g, ''), 'hex');

Upvotes: 5

Raivo Laanemets
Raivo Laanemets

Reputation: 1159

By the API docs at http://nodejs.org/api/buffer.html, the most straightforward seems to be:

var copy = new Buffer(existing.length);
existing.copy(copy)

The copy will be a Buffer containing the copy of the contents of the Buffer existing.

Upvotes: 1

Sven Slootweg
Sven Slootweg

Reputation: 3793

I'm not sure if this is considered the 'canonical' way, but it works:

buff1 = new Buffer("hi there!");
buff2 = new Buffer(buff1.length);

buff1.copy(buff2);
console.log(buff2.toString()); // hi there!

Upvotes: 1

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