feat(firestore,windows): add support for Blob decoding on Windows

packages/cloud_firestore/cloud_firestore/example/integration_test/document_reference_e2e.dart

@@ -268,6 +268,16 @@ void runDocumentReferenceTests() {
     });
 
     group('DocumentReference.get()', () {
+      test('gets blob data', () async {
+        final document = await initializeTest('document-get-blob');
+        final blob = Blob(Uint8List.fromList(<int>[0, 127, 255]));
+        await document.set(<String, Object?>{'blob': blob});
+
+        final snapshot = await document.get();
+
+        expect(snapshot.get('blob'), blob);
+      });
+
       test(
         'preserves native error messages when offline',
         () async {

packages/cloud_firestore/cloud_firestore/ios/cloud_firestore/Sources/cloud_firestore/FLTFirebaseFirestoreWriter.m

@@ -9,6 +9,9 @@
 #import "include/cloud_firestore/Private/FLTFirebaseFirestoreUtils.h"
 #import "include/cloud_firestore/Public/FLTFirebaseFirestorePlugin.h"
 
+static const UInt8 FLTStandardFieldList = 12;
+static const UInt8 FLTStandardFieldMap = 13;
+
 @implementation FLTFirebaseFirestoreWriter : FlutterStandardWriter
 - (void)writeValue:(id)value {
   if ([value isKindOfClass:[NSDate class]]) {
@@ -51,15 +54,30 @@ - (void)writeValue:(id)value {
     [self writeValue:extension.databaseURL];
 
   } else if ([value isKindOfClass:[FIRDocumentSnapshot class]]) {
-    [super writeValue:[self FIRDocumentSnapshot:value]];
+    [self writeValue:[self FIRDocumentSnapshot:value]];
   } else if ([value isKindOfClass:[FIRLoadBundleTaskProgress class]]) {
-    [super writeValue:[self FIRLoadBundleTaskProgress:value]];
+    [self writeValue:[self FIRLoadBundleTaskProgress:value]];
   } else if ([value isKindOfClass:[FIRQuerySnapshot class]]) {
-    [super writeValue:[self FIRQuerySnapshot:value]];
+    [self writeValue:[self FIRQuerySnapshot:value]];
   } else if ([value isKindOfClass:[FIRDocumentChange class]]) {
-    [super writeValue:[self FIRDocumentChange:value]];
+    [self writeValue:[self FIRDocumentChange:value]];
   } else if ([value isKindOfClass:[FIRSnapshotMetadata class]]) {
-    [super writeValue:[self FIRSnapshotMetadata:value]];
+    [self writeValue:[self FIRSnapshotMetadata:value]];
+  } else if ([value isKindOfClass:[NSArray class]]) {
+    NSArray *list = value;
+    [self writeByte:FLTStandardFieldList];
+    [self writeSize:(UInt32)list.count];
+    for (id item in list) {
+      [self writeValue:item];
+    }
+  } else if ([value isKindOfClass:[NSDictionary class]]) {
+    NSDictionary *map = value;
+    [self writeByte:FLTStandardFieldMap];
+    [self writeSize:(UInt32)map.count];
+    for (id key in map) {
+      [self writeValue:key];
+      [self writeValue:map[key]];
+    }
   } else if ([value isKindOfClass:[NSNumber class]]) {
     NSNumber *number = (NSNumber *)value;
 

packages/cloud_firestore/cloud_firestore/windows/cloud_firestore_plugin.cpp

@@ -21,6 +21,7 @@
 #include <mutex>
 #include <queue>
 #include <sstream>
+#include <vector>
 
 #include "cloud_firestore/plugin_version.h"
 #include "firebase/app.h"
@@ -470,7 +471,8 @@ GetServerTimestampBehaviorFromPigeon(
   }
 }
 
-EncodableValue ConvertFieldValueToEncodableValue(const FieldValue& fieldValue) {
+EncodableValue CloudFirestorePlugin::ConvertFieldValueToEncodableValue(
+    const FieldValue& fieldValue) {
   switch (fieldValue.type()) {
     case FieldValue::Type::kNull:
       return EncodableValue();
@@ -492,6 +494,15 @@ EncodableValue ConvertFieldValueToEncodableValue(const FieldValue& fieldValue) {
     case FieldValue::Type::kString:
       return EncodableValue(fieldValue.string_value());
 
+    case FieldValue::Type::kBlob: {
+      std::vector<uint8_t> bytes;
+      if (fieldValue.blob_size() > 0) {
+        bytes.assign(fieldValue.blob_value(),
+                     fieldValue.blob_value() + fieldValue.blob_size());
+      }
+      return CustomEncodableValue(bytes);
+    }
+
     case FieldValue::Type::kMap: {
       EncodableMap encodableMap;
       for (const auto& [key, val] : fieldValue.map_value()) {
@@ -527,8 +538,9 @@ flutter::EncodableMap ConvertToEncodableMap(
   EncodableMap convertedMap;
   for (const auto& kv : originalMap) {
     EncodableValue key = EncodableValue(kv.first);
-    EncodableValue value = ConvertFieldValueToEncodableValue(
-        kv.second);             // convert FieldValue to EncodableValue
+    EncodableValue value =
+        CloudFirestorePlugin::ConvertFieldValueToEncodableValue(
+            kv.second);         // convert FieldValue to EncodableValue
     convertedMap[key] = value;  // insert into the new map
   }
   return convertedMap;

packages/cloud_firestore/cloud_firestore/windows/cloud_firestore_plugin.h

@@ -27,6 +27,8 @@ class CloudFirestorePlugin : public flutter::Plugin,
   static void RegisterWithRegistrar(flutter::PluginRegistrarWindows* registrar);
   static firebase::firestore::FieldValue ConvertToFieldValue(
       const flutter::EncodableValue& variant);
+  static flutter::EncodableValue ConvertFieldValueToEncodableValue(
+      const firebase::firestore::FieldValue& fieldValue);
 
   CloudFirestorePlugin();
 

packages/cloud_firestore/cloud_firestore/windows/firestore_codec.cpp

@@ -8,6 +8,7 @@
 #include <memory>
 #include <optional>
 #include <string>
+#include <vector>
 
 #include "cloud_firestore_plugin.h"
 #include "firebase/app.h"
@@ -65,6 +66,14 @@ void cloud_firestore_windows::FirestoreCodec::WriteValue(
       flutter::StandardCodecSerializer::WriteValue(appName, stream);
       flutter::StandardCodecSerializer::WriteValue(reference.path(), stream);
       flutter::StandardCodecSerializer::WriteValue(databaseUrl, stream);
+    } else if (custom_value.type() == typeid(std::vector<uint8_t>)) {
+      const std::vector<uint8_t>& bytes =
+          std::any_cast<const std::vector<uint8_t>&>(custom_value);
+      stream->WriteByte(DATA_TYPE_BLOB);
+      WriteSize(bytes.size(), stream);
+      if (!bytes.empty()) {
+        stream->WriteBytes(bytes.data(), bytes.size());
+      }
     } else if (custom_value.type() ==
                typeid(double)) {  // Assuming Double is standard C++ double
       const double& myDouble = std::any_cast<double>(custom_value);