Add FlMethodChannel

Author: robert-ancell

ci/licenses_golden/licenses_flutter

@@ -1174,17 +1174,35 @@ FILE: ../../../flutter/shell/platform/glfw/text_input_plugin.cc
 FILE: ../../../flutter/shell/platform/glfw/text_input_plugin.h
 FILE: ../../../flutter/shell/platform/linux/fl_binary_messenger.cc
 FILE: ../../../flutter/shell/platform/linux/fl_binary_messenger_private.h
+FILE: ../../../flutter/shell/platform/linux/fl_codec.cc
 FILE: ../../../flutter/shell/platform/linux/fl_dart_project.cc
 FILE: ../../../flutter/shell/platform/linux/fl_engine.cc
 FILE: ../../../flutter/shell/platform/linux/fl_engine_private.h
+FILE: ../../../flutter/shell/platform/linux/fl_json_codec.cc
+FILE: ../../../flutter/shell/platform/linux/fl_json_codec_test.cc
+FILE: ../../../flutter/shell/platform/linux/fl_json_method_codec.cc
+FILE: ../../../flutter/shell/platform/linux/fl_method_channel.cc
+FILE: ../../../flutter/shell/platform/linux/fl_method_codec.cc
 FILE: ../../../flutter/shell/platform/linux/fl_renderer.cc
 FILE: ../../../flutter/shell/platform/linux/fl_renderer.h
 FILE: ../../../flutter/shell/platform/linux/fl_renderer_x11.cc
 FILE: ../../../flutter/shell/platform/linux/fl_renderer_x11.h
+FILE: ../../../flutter/shell/platform/linux/fl_standard_codec.cc
+FILE: ../../../flutter/shell/platform/linux/fl_standard_codec_test.cc
+FILE: ../../../flutter/shell/platform/linux/fl_standard_method_codec.cc
+FILE: ../../../flutter/shell/platform/linux/fl_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_view.cc
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_binary_messenger.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_codec.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_dart_project.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_engine.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_json_codec.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_json_method_codec.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_method_channel.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_method_codec.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_standard_codec.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_standard_method_codec.h
+FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_value.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/fl_view.h
 FILE: ../../../flutter/shell/platform/linux/public/flutter_linux/flutter_linux.h
 FILE: ../../../flutter/shell/platform/windows/angle_surface_manager.cc

shell/platform/linux/BUILD.gn

@@ -5,6 +5,7 @@
 assert(is_linux)
 
 import("//flutter/shell/platform/glfw/config.gni")
+import("//flutter/testing/testing.gni")
 
 group("linux") {
   deps = [
@@ -45,7 +46,15 @@ if (build_glfw_shell) {
 _public_headers = [
   "public/flutter_linux/fl_binary_messenger.h",
   "public/flutter_linux/fl_dart_project.h",
+  "public/flutter_linux/fl_codec.h",
   "public/flutter_linux/fl_engine.h",
+  "public/flutter_linux/fl_json_codec.h",
+  "public/flutter_linux/fl_json_method_codec.h",
+  "public/flutter_linux/fl_method_channel.h",
+  "public/flutter_linux/fl_method_codec.h",
+  "public/flutter_linux/fl_standard_codec.h",
+  "public/flutter_linux/fl_standard_method_codec.h",
+  "public/flutter_linux/fl_value.h",
   "public/flutter_linux/fl_view.h",
   "public/flutter_linux/flutter_linux.h",
 ]
@@ -59,10 +68,18 @@ source_set("flutter_linux") {
 
   sources = [
     "fl_binary_messenger.cc",
+    "fl_codec.cc",
     "fl_dart_project.cc",
     "fl_engine.cc",
+    "fl_json_codec.cc",
+    "fl_json_method_codec.cc",
+    "fl_method_channel.cc",
+    "fl_method_codec.cc",
     "fl_renderer.cc",
     "fl_renderer_x11.cc",
+    "fl_standard_codec.cc",
+    "fl_standard_method_codec.cc",
+    "fl_value.cc",
     "fl_view.cc",
   ]
 
@@ -80,6 +97,23 @@ source_set("flutter_linux") {
   ]
 }
 
+executable("flutter_linux_unittests") {
+  testonly = true
+
+  sources = [
+    "fl_json_codec_test.cc",
+    "fl_standard_codec_test.cc",
+    "fl_test.cc",
+  ]
+
+  public_configs = [ "//flutter:config" ]
+
+  deps = [
+    ":flutter_linux",
+    "//flutter/testing",
+  ]
+}
+
 shared_library("flutter_linux_gtk") {
   deps = [
     ":flutter_linux",

shell/platform/linux/fl_codec.cc

@@ -0,0 +1,47 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_codec.h"
+
+#include <gmodule.h>
+
+G_DEFINE_QUARK(fl_codec_error_quark, fl_codec_error)
+
+// Added here to stop the compiler from optimising this function away
+G_MODULE_EXPORT GType fl_codec_get_type();
+
+G_DEFINE_TYPE(FlCodec, fl_codec, G_TYPE_OBJECT)
+
+static void fl_codec_class_init(FlCodecClass* klass) {}
+
+static void fl_codec_init(FlCodec* self) {}
+
+G_MODULE_EXPORT gboolean fl_codec_write_value(FlCodec* self,
+                                              GByteArray* buffer,
+                                              FlValue* value,
+                                              GError** error) {
+  g_return_val_if_fail(FL_IS_CODEC(self), FALSE);
+  g_return_val_if_fail(buffer != nullptr, FALSE);
+
+  g_autoptr(FlValue) null_value = NULL;
+  if (value == nullptr)
+    value = null_value = fl_value_null_new();
+
+  return FL_CODEC_GET_CLASS(self)->write_value(self, buffer, value, error);
+}
+
+G_MODULE_EXPORT FlValue* fl_codec_read_value(FlCodec* self,
+                                             GBytes* buffer,
+                                             size_t* offset,
+                                             GError** error) {
+  g_return_val_if_fail(FL_IS_CODEC(self), nullptr);
+  g_return_val_if_fail(buffer != nullptr, nullptr);
+
+  size_t o = offset != nullptr ? *offset : 0;
+  FlValue* value =
+      FL_CODEC_GET_CLASS(self)->read_value(self, buffer, &o, error);
+  if (value != nullptr && offset != nullptr)
+    *offset = o;
+  return value;
+}