Golang implementation of fastimage.
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LICENSE
README.md
bmp.go
fastimage.go
fastimage_test.go
gif.go
image_size.go
image_type.go
jpeg.go
png.go
tiff.go
util.go
webp.go
xbuffer.go

README.md

fastimage

Golang implementation of fastimage.

Finds the type and/or size of an image given its uri by fetching as little as needed.

RECREATED and IMPROVED fastimage for golang.

Started from Ruben Fonseca (@rubenfonseca) 's fastimage https://github.com/rubenfonseca/fastimage

Included TIFF and WEBP support from https://github.com/golang/image

How?

fastimage parses the image data as it is downloaded. As soon as it finds out the size and type of the image, it stops the download.

Install

$ go get github.com/sillydong/fastimage

Usage

For instance, this is a big 10MB JPEG image on wikipedia:

Method1

customHeaders := map[string]string{
    "X-SECRET-HEADER": "your-header-value"
}
instance := fastimage.NewFastImage(2, customHeaders)
//leave it to nil to use default header settings
//eg. 
//instance := fastimage.NewFastImage(2, nil)

url1 := "http://upload.wikimedia.org/wikipedia/commons/9/9a/SKA_dishes_big.jpg"
imagetype1, size1, err1 := instance.Detect(url1)
fmt.Printf("%+v\t%+v\t%+v\n", imagetype1, size1, err1)

url2 := "http://upload.wikimedia.org/wikipedia/commons/9/9a/SKA_dishes_big.jpg"
imagetype2, size2, err2 := instance.Detect(url2)
fmt.Printf("%+v\t%+v\t%+v\n", imagetype2, size2, err2)

Method2

url1 := "http://upload.wikimedia.org/wikipedia/commons/9/9a/SKA_dishes_big.jpg"
imagetype1, size1, err1 := fastimage.GetImageSize(url1)
fmt.Printf("%+v\t%+v\t%+v\n", imagetype1, size1, err1)

url2 := "http://upload.wikimedia.org/wikipedia/commons/9/9a/SKA_dishes_big.jpg"
imagetype2, size2, err2 := fastimage.GetImageSize(url2)
fmt.Printf("%+v\t%+v\t%+v\n", imagetype2, size2, err2)

Notice

Method1 is better to detect multiple images because it shares one *http.Client.

Supported file types

File type Can detect type? Can detect size?
PNG Yes Yes
JPEG Yes Yes
GIF Yes Yes
BMP Yes Yes
TIFF Yes Yes
WEBP Yes Yes

Notice

Some webp images' Content-Type in header is text/plain. Here in this library we only parse response data when Content-Type has keyword "image" in.

TODO

I'm thinking about using valyala/fasthttp to replace net/http to get better network performance.

License

fastimage is under MIT license. See the LICENSE file for details.