update: latest source changes

node_modules/expo-image/ios/ThumbhashLoader.swift

@@ -0,0 +1,52 @@
+import SDWebImage
+import ExpoModulesCore
+
+class ThumbhashLoader: NSObject, SDImageLoader {
+  // MARK: - SDImageLoader
+
+  func canRequestImage(for url: URL?) -> Bool {
+    return url?.scheme == "thumbhash"
+  }
+
+  func requestImage(
+    with url: URL?,
+    options: SDWebImageOptions = [],
+    context: [SDWebImageContextOption: Any]?,
+    progress progressBlock: SDImageLoaderProgressBlock?,
+    completed completedBlock: SDImageLoaderCompletedBlock? = nil
+  ) -> SDWebImageOperation? {
+    guard let url = url else {
+      let error = makeNSError(description: "URL provided to ThumbhashLoader is missing")
+      completedBlock?(nil, nil, error, false)
+      return nil
+    }
+    // The URI looks like this: thumbhash:/3OcRJYB4d3h\iIeHeEh3eIhw+j2w
+    // ThumbHash may include slashes which could break the structure of the URL, so we replace them
+    // with backslashes on the JS side and revert them back to slashes here, before generating the image.
+    var thumbhash = url.pathComponents[1].replacingOccurrences(of: "\\", with: "/")
+
+    // Thumbhashes with transparency cause the conversion to data to fail, padding the thumbhash string to correct length fixes that
+    let remainder = thumbhash.count % 4
+    if remainder > 0 {
+      thumbhash = thumbhash.padding(toLength: thumbhash.count + 4 - remainder, withPad: "=", startingAt: 0)
+    }
+
+    guard !thumbhash.isEmpty, let thumbhashData = Data(base64Encoded: thumbhash, options: .ignoreUnknownCharacters) else {
+      let error = makeNSError(description: "URL provided to ThumbhashLoader is invalid")
+      completedBlock?(nil, nil, error, false)
+      return nil
+    }
+
+    DispatchQueue.global(qos: .userInitiated).async {
+      let image = image(fromThumbhash: thumbhashData)
+      DispatchQueue.main.async {
+        completedBlock?(image, nil, nil, true)
+      }
+    }
+    return nil
+  }
+
+  func shouldBlockFailedURL(with url: URL, error: Error) -> Bool {
+    return true
+  }
+}