100 lines
3.7 KiB
Swift
100 lines
3.7 KiB
Swift
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//
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// https://mczachurski.dev
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// Copyright © 2022 Marcin Czachurski and the repository contributors.
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// Licensed under the MIT License.
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//
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import Foundation
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import UIKit
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public extension Dictionary<String, Any> {
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func getExifValue(_ key: String) -> String? {
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if let value = self[key] as? String {
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return value
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}
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if let dictionary = self[key] as? [String: Any], let value = dictionary[key] {
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return value as? String
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}
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return nil
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}
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}
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public extension Data {
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func getExifData() -> [String: Any]? {
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var imageInfo: [String: Any]? = nil
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guard let imageSource = CGImageSourceCreateWithData(self as CFData, nil),
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let metadata = CGImageSourceCopyMetadataAtIndex(imageSource, 0, nil),
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let tags = CGImageMetadataCopyTags(metadata) else {
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return nil
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}
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imageInfo = self.readMetadataTagArr(tagArr: tags)
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return imageInfo
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}
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/// Reads the Arrays of tags and convert them into a dictionary of [String: Any].
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private func readMetadataTagArr(tagArr: CFArray) -> [String: Any]? {
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var result = [String: Any]()
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for (_, tag) in (tagArr as NSArray).enumerated() {
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let tagMetadata = tag as! CGImageMetadataTag
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if let cfName = CGImageMetadataTagCopyName(tagMetadata) {
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let name = String(cfName)
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result[name] = self.readMetadataTag(metadataTag: tagMetadata)
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}
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}
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return result
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}
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/// Convert CGImageMetadataTag to a dictionary of [String: Any].
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private func readMetadataTag(metadataTag: CGImageMetadataTag) -> [String: Any] {
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var result = [String: Any]()
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guard let cfName = CGImageMetadataTagCopyName(metadataTag) else { return result }
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let name = String(cfName)
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let value = CGImageMetadataTagCopyValue(metadataTag)
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/// checking the type of `value` object and then performing respective operation on `value`
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if CFGetTypeID(value) == CFStringGetTypeID() {
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let valueStr = String(value as! CFString)
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result[name] = valueStr
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} else if CFGetTypeID(value) == CFDictionaryGetTypeID() {
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let nsDict: NSDictionary = value as! CFDictionary
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result[name] = self.getDictionary(from: nsDict)
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} else if CFGetTypeID(value) == CFArrayGetTypeID() {
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let valueArr: NSArray = value as! CFArray
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for (_, item) in valueArr.enumerated() {
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let tagMetadata = item as! CGImageMetadataTag
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result[name] = self.readMetadataTag(metadataTag: tagMetadata)
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}
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} else {
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// when the data was of some other type
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let descriptionString: CFString = CFCopyDescription(value);
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let str = String(descriptionString)
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result[name] = str
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}
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return result
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}
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/// Converting CGImage Metadata dictionary to [String: Any]
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private func getDictionary(from nsDict: NSDictionary) -> [String: Any] {
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var subDictionary = [String: Any]()
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for (key, val) in nsDict {
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guard let key = key as? String else { continue }
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let tempDict: [String: Any] = [key: val]
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if JSONSerialization.isValidJSONObject(tempDict) {
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subDictionary[key] = val
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} else {
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let mData = val as! CGImageMetadataTag
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let tempDict: [String: Any] = [key: self.readMetadataTag(metadataTag: mData)]
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if JSONSerialization.isValidJSONObject(tempDict) {
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subDictionary[key] = tempDict
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}
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}
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}
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return subDictionary
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}
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}
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