feat: open-source 小浣熊阅读 for iOS

Tests/LegadoCoreTests/QRCodeDecoderTests.swift

@@ -0,0 +1,28 @@
+import CoreImage
+import CoreImage.CIFilterBuiltins
+import Foundation
+import ImageIO
+import Testing
+import UniformTypeIdentifiers
+@testable import LegadoCore
+
+struct QRCodeDecoderTests {
+    @Test func decodesActualPNGQRCodeAndResolvesImportPayload() throws {
+        let payload = "legado://import/bookSource?src=https%3A%2F%2Fexample.test%2Fsources.json"
+        let filter = CIFilter.qrCodeGenerator()
+        filter.message = Data(payload.utf8)
+        let output = try #require(filter.outputImage?.transformed(by: CGAffineTransform(scaleX: 8, y: 8)))
+        let image = try #require(CIContext().createCGImage(output, from: output.extent))
+        let data = NSMutableData()
+        let destination = try #require(CGImageDestinationCreateWithData(data, UTType.png.identifier as CFString, 1, nil))
+        CGImageDestinationAddImage(destination, image, nil)
+        #expect(CGImageDestinationFinalize(destination))
+        let values = try QRCodeDecoder().detect(in: data as Data)
+        #expect(values == [payload])
+        #expect(try RuleImportInput.parse(values[0]) == .remote(URL(string: "https://example.test/sources.json")!, withoutUserAgent: false))
+    }
+
+    @Test func invalidImageReportsDecodeFailure() {
+        #expect(throws: (any Error).self) { try QRCodeDecoder().detect(in: Data("invalid image".utf8)) }
+    }
+}