Buffer issue

[Swatto]

I'm using Knox to download an image on S3 and I'm stocking data in a buffer and place it in sharp constructor method.

res.setEncoding('binary');
var output = new Buffer('', 'binary');
res.on('data', function(chunck){
  output.write(chunck);
});
res.on('end', function(){
  callback(output, false);
});
// ...
sharp(rawImg)
  .resize(target.size, target.size)
  .toBuffer(function(err, image){
    if(err){
      console.log(err);
    }
    callback(image);
  });

But I have an error in the callback : Unsupported input file undefined
The buffer is not corrupted : if I output it with buffer.toString() as an express response, the image is displayed.

Do you have any idea guys ?

[lovell]

Hi Gaël, it hard to tell from this snippet what rawImg contains.

The sharp constructor can handle a native string (=filename) or Buffer object.

What does typeof rawImg and rawImg instanceof Buffer return?

[Swatto]

the rawImg instanceof Buffer returns true. I think it's this line message.

[lovell]

Thanks @Swatto, this could happen if the Buffer is empty. What does rawImg.length return?

[Swatto]

Yeah it was that stupid thing...

Sorry guys and great project !