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Description

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

Programming language: Go
License: MIT License
Tags: Images     Image Discovery     Web Crawling    

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README

fastimage

GoDoc Build Status wercker status

by Ruben Fonseca (@rubenfonseca)

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

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/rubenfonseca/fastimage

Usage

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

url := "http://upload.wikimedia.org/wikipedia/commons/9/9a/SKA_dishes_big.jpg"

fastimage.Debug()
imagetype, size, err := fastimage.DetectImageType(url)
if err != nil {
    // Something went wrong, http failed? not an image?
    panic(err)
}

switch imagetype {
case fastimage.JPEG:
    log.Printf("JPEG")
case fastimage.PNG:
    log.Printf("PNG")
case fastimage.GIF:
    log.Printf("GIF")
}

log.Printf("Image type: %s", imagetype.String())
log.Printf("Image size: %v", size)

At the end, you can read something like this:

Closed after reading just 17863 bytes out of 10001439 bytes

If you want to set request timeout for url:

// the second argument is request timeout (milliseconds).
// FYI, DetectImageType() uses default timeout 5000ms.
imagetype, size, err := fastimage.DetectImageTypeWithTimeout(url, 2000)

Supported file types

File type Can detect type? Can detect size?
PNG Yes Yes
JPEG Yes Yes
GIF Yes Yes
BMP Yes No
TIFF Yes No

Project details

License

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


*Note that all licence references and agreements mentioned in the fastimage README section above are relevant to that project's source code only.