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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| import 'dart:async'; | ||
| import 'dart:ffi'; | ||
| import 'dart:isolate'; | ||
|
|
||
| import 'ns_data.dart'; | ||
| import 'ns_string.dart'; | ||
| import 'objective_c_bindings_generated.dart'; | ||
|
|
||
| extension NSInputStreamStreamExtension on Stream<List<int>> { | ||
| /// Return a [NSInputStream] that, when read, will contain the contents of | ||
| /// the [Stream]. | ||
| /// | ||
| /// > [!IMPORTANT] | ||
| /// > [NSInputStream.read_maxLength_] must be called from a different thread | ||
| /// > or [Isolate] than the one that calls [toNSInputStream]. Otherwise, | ||
| /// > [NSInputStream.read_maxLength_] will deadlock waiting for data to be | ||
| /// > added from the [Stream]. | ||
| NSInputStream toNSInputStream() { | ||
| // Eagerly add data until `maxReadAheadSize` is buffered. | ||
| const maxReadAheadSize = 4096; | ||
|
|
||
| final port = ReceivePort(); | ||
| final inputStream = | ||
| DartInputStreamAdapter.inputStreamWithPort_(port.sendPort.nativePort); | ||
| late final StreamSubscription<dynamic> dataSubscription; | ||
|
|
||
| dataSubscription = listen((data) { | ||
| if (inputStream.addData_(data.toNSData()) > maxReadAheadSize) { | ||
| dataSubscription.pause(); | ||
| } | ||
| }, onError: (Object e) { | ||
| final d = NSMutableDictionary.new1(); | ||
| d.setObject_forKey_(e.toString().toNSString(), NSLocalizedDescriptionKey); | ||
| inputStream.setError_(NSError.errorWithDomain_code_userInfo_( | ||
| 'DartError'.toNSString(), 0, d)); | ||
| port.close(); | ||
| }, onDone: () { | ||
| inputStream.setDone(); | ||
| port.close(); | ||
| }, cancelOnError: true); | ||
|
|
||
| dataSubscription.pause(); | ||
| port.listen((count) { | ||
| // -1 indicates that the `NSInputStream` is closed. All other values | ||
| // indicate that the `NSInputStream` needs more data. | ||
| if (count == -1) { | ||
| dataSubscription.cancel(); | ||
| } else { | ||
| dataSubscription.resume(); | ||
| } | ||
| }, onDone: () { | ||
| dataSubscription.cancel(); | ||
| }); | ||
|
|
||
| return inputStream; | ||
| } | ||
| } |
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