Get a remote image's size and type without downloading the full image

Related tags

Animation FastImage
Overview

FastImage

Build Status

FastImage 2.0 is an Swift port of the Ruby project by Stephen Sykes. It's directive is to request as little data as possible (usually just the first batch of bytes returned by a request) to determine the size and type of a remote image.

This means you can get the size of a large image (say 2MB), by only downloading around 8KB - 32KB

Fairly simple to use:

let fastImage = FastImage()
let imageURL = URL("http://i.imgur.com/7GLI90s.jpg")!

fastImage.imageSizeAndType(for: url, completion: { result in
  switch result {
  case .success(let (size, type)):
    // `size` would be 1600 x 1200
    // `type` would be .jpg
    ...
  case .failure(let error):
    // Get a URLError here (timed out, etc.) or a SizeNotFoundError (just couldn't get a size based on data)
  }
})

Currently supports JPEG, PNG, BMP, GIF, TIFF, ICO, CUR, and PSD.

Compatability

2.0 was built with Xcode 10.1 with a deployment target of 11.0 but could likely be set lower

License

MIT, see LICENSE file

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Comments
  • Could not get the block callback when the server response 403

    Could not get the block callback when the server response 403

    Thanks for you nice library! But I found a issue.

    If the server response 403, and contains http body(such as nginx), the block won't be called with error.

    • (BOOL)parseRequest:(_KHIFIRequest *)request { NSData *data = request.data;//[request.data copy];

      // Get the type KHIFastImageType type = [self typeForImageData:data]; if (type != KHIFastImageTypeUnsupported) { .... } return YES;

    You pass the YES, and then the requests remove the key.

    Thus - (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error will not call the block.

    opened by siriuscn 2
Releases(2.1.0)
Owner
Kyle Hickinson
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