How to append to a buffer?

[Sean Clark Hess]

When downloading something over http, it's usually easier to collect
all the data from the request and return it all at once.

For example, if the http request returns a string, you can do
something like this:

request.on('response', function(response) {
var data = ""
response.on('data', function(chunk) {
data += chunk
})

response.on('end', function() {
callback(data)
})
})

How can I do the same thing for binary data? Like, if I'm downloading
an image? I'm using node v0.2.6

Thanks
~sean

[Tim Caswell]

Buffers can't be resized.  What I often do is collect an array of buffer objects and then at the end, loop over them to get the total size, create a new buffer, and then loop again copying the buffers into their respective slots in the big buffer.

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[mscdex]

On Mar 2, 7:20 pm, Sean Clark Hess <seanh...@gmail.com> wrote:
> How can I do the same thing for binary data? Like, if I'm downloading
> an image?  I'm using node v0.2.6

Something like this:

request.on('response', function(res) {
var data = [], dataLen = 0;
res.on('data', function(chunk) {
data.push(chunk);
dataLen += chunk.length;
})
res.on('end', function() {
var buf = new Buffer(dataLen);
for (var i=0,len=data.length,pos=0; i<len; i++) {
data[i].copy(buf, pos);
pos += data[i].length;
}
callback(buf);
})
})

[AJ ONeal]

Yep

https://github.com/coolaj86/node-bufferjs

npm install bufferjs

require('bufferjs')

Buffer.concat(arrayOfBuffers);

AJ ONeal
(317) 426-6525

[Sean Clark Hess]

Cool. Thanks all

On Mar 2, 6:52 pm, AJ ONeal <coola...@gmail.com> wrote:
> Yep
>
> https://github.com/coolaj86/node-bufferjs
>
> npm install bufferjs
>
> require('bufferjs')
>
> Buffer.concat(arrayOfBuffers);
>
> AJ ONeal
> (317) 426-6525
>
>
>
>
>
>
>
> On Wed, Mar 2, 2011 at 5:35 PM, Tim Caswell <t...@creationix.com> wrote:
> > Buffers can't be resized.  What I often do is collect an array of buffer
> > objects and then at the end, loop over them to get the total size, create a
> > new buffer, and then loop again copying the buffers into their respective
> > slots in the big buffer.
>

[Xavi]

BTW, there's now a `Buffer.concat` built in.