chore: move files around

src/Data - Android/Apk+Icon.swift

@@ -0,0 +1,74 @@
+import Foundation
+import AndroidXML
+
+extension MetaInfo {
+	/// Read `AndroidManifest.xml` but only extract `appIcon`.
+	func readApk_Icon() -> Apk_Icon? {
+		assert(type == .APK)
+		var apk = Apk(self)
+		return Apk_Icon(&apk)
+	}
+}
+
+
+// MARK: - Apk_Icon
+
+/// Representation of `AndroidManifest.xml` (containing only the icon extractor).
+/// Seperate from main class because everything else is not needed for `ThumbnailProvider`
+struct Apk_Icon {
+	let path: String
+	let data: Data
+	
+	init?(_ apk: inout Apk, iconRef: String? = nil) {
+		if apk.isApkm, let iconData = apk.mainZip.unzipFile("icon.png") {
+			path = "icon.png"
+			data = iconData
+			return
+		}
+		
+		guard let manifest = apk.manifest else {
+			return nil
+		}
+		
+		var ref = iconRef
+		// no need to parse xml if reference already supplied
+		if ref == nil {
+			if let xml = try? AndroidXML.init(data: manifest) {
+				let parser = xml.parseXml()
+				try? parser.iterElements({ startTag, attributes in
+					if startTag == "application" {
+						ref = try? attributes.get("android:icon")?.resolve(parser.stringPool)
+					}
+				}) {_ in}
+			} else {
+				// fallback to xml-string parser
+				ref = ApkXmlIconParser().run(manifest)
+			}
+		}
+		
+		guard let img = apk.resolveIcon(&ref) else {
+			return nil
+		}
+		path = ref!
+		data = img
+	}
+}
+
+/// Shorter form of `ApkXmlManifestParser` to only exctract the icon reference (used for Thumbnail Provider)
+private class ApkXmlIconParser: NSObject, XMLParserDelegate {
+	var result: String? = nil
+	
+	func run(_ data: Data) -> String? {
+		let parser = XMLParser(data: data)
+		parser.delegate = self
+		parser.parse()
+		return result
+	}
+	
+	func parser(_ parser: XMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attrs: [String : String] = [:]) {
+		if elementName == "application" {
+			result = attrs["android:icon"]
+			parser.abortParsing()
+		}
+	}
+}