Update to ffi 0.3.0-nullsafety.1 (flutter#3513)

ffi 0.3.0 supports the new memory allocation model in Dart 2.12.0-259 and later.

Author: Tim Sneath

packages/path_provider/path_provider_windows/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.0-nullsafety.2
+
+* Bump ffi dependency to 0.3.0-nullsafety.1
+
 ## 0.1.0-nullsafety.1
 
 * Bump win32 dependency to latest version.

packages/path_provider/path_provider_windows/example/windows/flutter/CMakeLists.txt

@@ -91,6 +91,7 @@ add_custom_command(
     ${FLUTTER_TOOL_ENVIRONMENT}
     "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.bat"
       windows-x64 $<CONFIG>
+  VERBATIM
 )
 add_custom_target(flutter_assemble DEPENDS
   "${FLUTTER_LIBRARY}"

packages/path_provider/path_provider_windows/lib/src/path_provider_windows_real.dart

@@ -28,17 +28,17 @@ class VersionInfoQuerier {
     }
     const kEnUsLanguageCode = '040904e4';
     final keyPath = TEXT('\\StringFileInfo\\$kEnUsLanguageCode\\$key');
-    final length = allocate<Uint32>();
-    final valueAddress = allocate<Pointer<Utf16>>();
+    final length = calloc<Uint32>();
+    final valueAddress = calloc<Pointer<Utf16>>();
     try {
       if (VerQueryValue(versionInfo, keyPath, valueAddress, length) == 0) {
         return null;
       }
       return valueAddress.value.unpackString(length.value);
     } finally {
-      free(keyPath);
-      free(length);
-      free(valueAddress);
+      calloc.free(keyPath);
+      calloc.free(length);
+      calloc.free(valueAddress);
     }
   }
 }
@@ -54,7 +54,7 @@ class PathProviderWindows extends PathProviderPlatform {
   /// This is typically the same as the TMP environment variable.
   @override
   Future<String?> getTemporaryPath() async {
-    final buffer = allocate<Uint16>(count: MAX_PATH + 1).cast<Utf16>();
+    final buffer = calloc<Uint16>(MAX_PATH + 1).cast<Utf16>();
     String path;
 
     try {
@@ -82,7 +82,7 @@ class PathProviderWindows extends PathProviderPlatform {
 
       return Future.value(path);
     } finally {
-      free(buffer);
+      calloc.free(buffer);
     }
   }
 
@@ -115,7 +115,7 @@ class PathProviderWindows extends PathProviderPlatform {
   /// folderID is a GUID that represents a specific known folder ID, drawn from
   /// [WindowsKnownFolder].
   Future<String> getPath(String folderID) {
-    final pathPtrPtr = allocate<Pointer<Utf16>>();
+    final pathPtrPtr = calloc<Pointer<Utf16>>();
     final Pointer<GUID> knownFolderID = calloc<GUID>()..ref.setGUID(folderID);
 
     try {
@@ -135,8 +135,8 @@ class PathProviderWindows extends PathProviderPlatform {
       final path = pathPtrPtr.value.unpackString(MAX_PATH);
       return Future.value(path);
     } finally {
-      free(pathPtrPtr);
-      free(knownFolderID);
+      calloc.free(pathPtrPtr);
+      calloc.free(knownFolderID);
     }
   }
 
@@ -155,8 +155,8 @@ class PathProviderWindows extends PathProviderPlatform {
     String? productName;
 
     final Pointer<Utf16> moduleNameBuffer =
-        allocate<Uint16>(count: MAX_PATH + 1).cast<Utf16>();
-    final Pointer<Uint32> unused = allocate<Uint32>();
+        calloc<Uint16>(MAX_PATH + 1).cast<Utf16>();
+    final Pointer<Uint32> unused = calloc<Uint32>();
     Pointer<Uint8>? infoBuffer;
     try {
       // Get the module name.
@@ -169,10 +169,10 @@ class PathProviderWindows extends PathProviderPlatform {
       // From that, load the VERSIONINFO resource
       int infoSize = GetFileVersionInfoSize(moduleNameBuffer, unused);
       if (infoSize != 0) {
-        infoBuffer = allocate<Uint8>(count: infoSize);
+        infoBuffer = calloc<Uint8>(infoSize);
         if (GetFileVersionInfo(moduleNameBuffer, 0, infoSize, infoBuffer) ==
             0) {
-          free(infoBuffer);
+          calloc.free(infoBuffer);
           infoBuffer = null;
         }
       }
@@ -191,10 +191,10 @@ class PathProviderWindows extends PathProviderPlatform {
           ? path.join(companyName, productName)
           : productName;
     } finally {
-      free(moduleNameBuffer);
-      free(unused);
+      calloc.free(moduleNameBuffer);
+      calloc.free(unused);
       if (infoBuffer != null) {
-        free(infoBuffer);
+        calloc.free(infoBuffer);
       }
     }
   }

packages/path_provider/path_provider_windows/pubspec.yaml

@@ -1,7 +1,7 @@
 name: path_provider_windows
 description: Windows implementation of the path_provider plugin
 homepage: https://github.com/flutter/plugins/tree/master/packages/path_provider/path_provider_windows
-version: 0.1.0-nullsafety.1
+version: 0.1.0-nullsafety.2
 
 flutter:
   plugin:
@@ -16,14 +16,15 @@ dependencies:
   path: ^1.8.0-nullsafety.3
   flutter:
     sdk: flutter
-  ffi: ^0.2.0-nullsafety.1
-  win32: ^2.0.0-nullsafety.9
+  ffi: '>=0.3.0-nullsafety.1 <2.0.0'
+  win32: ^2.0.0-nullsafety.10
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
   pedantic: ^1.10.0-nullsafety.3
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0-259.8.beta <3.0.0'
   flutter: ">=1.12.13+hotfix.4"
+