Created
October 19, 2016 04:43
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image_format
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private let pngHeader: [UInt8] = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A] | |
private let jpgHeaderSOI: [UInt8] = [0xFF, 0xD8] | |
private let jpgHeaderIF: [UInt8] = [0xFF] | |
private let gifHeader: [UInt8] = [0x47, 0x49, 0x46] | |
// MARK: - Image format | |
enum ImageFormat { | |
case Unknown, PNG, JPEG, GIF | |
} | |
extension NSData { | |
var kf_imageFormat: ImageFormat { | |
var buffer = [UInt8](count: 8, repeatedValue: 0) | |
self.getBytes(&buffer, length: 8) | |
if buffer == pngHeader { | |
return .PNG | |
} else if buffer[0] == jpgHeaderSOI[0] && | |
buffer[1] == jpgHeaderSOI[1] && | |
buffer[2] == jpgHeaderIF[0] | |
{ | |
return .JPEG | |
}else if buffer[0] == gifHeader[0] && | |
buffer[1] == gifHeader[1] && | |
buffer[2] == gifHeader[2] | |
{ | |
return .GIF | |
} | |
return .Unknown | |
} | |
} |
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