Implement resource packs

Source/Core/UICommon/ResourcePack/Manifest.cpp

@@ -0,0 +1,102 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "UICommon/ResourcePack/Manifest.h"
+
+#include <picojson/picojson.h>
+
+namespace ResourcePack
+{
+Manifest::Manifest(const std::string& json)
+{
+  picojson::value out;
+  auto error = picojson::parse(out, json);
+
+  if (!error.empty())
+  {
+    m_error = "Failed to parse manifest.";
+    m_valid = false;
+    return;
+  }
+
+  // Required fields
+  picojson::value& name = out.get("name");
+  picojson::value& version = out.get("version");
+  picojson::value& id = out.get("id");
+
+  // Optional fields
+  picojson::value& authors = out.get("authors");
+  picojson::value& description = out.get("description");
+  picojson::value& website = out.get("website");
+
+  if (!name.is<std::string>() || !id.is<std::string>() || !version.is<std::string>())
+  {
+    m_error = "Some objects have a bad type.";
+    m_valid = false;
+    return;
+  }
+
+  m_name = name.to_str();
+  m_version = version.to_str();
+  m_id = id.to_str();
+
+  if (authors.is<picojson::array>())
+  {
+    std::string author_list;
+    for (const auto& o : authors.get<picojson::array>())
+    {
+      author_list += o.to_str() + ", ";
+    }
+
+    if (!author_list.empty())
+      m_authors = author_list.substr(0, author_list.size() - 2);
+  }
+
+  if (description.is<std::string>())
+    m_description = description.to_str();
+
+  if (website.is<std::string>())
+    m_website = website.to_str();
+}
+
+bool Manifest::IsValid() const
+{
+  return m_valid;
+}
+
+const std::string& Manifest::GetName() const
+{
+  return m_name;
+}
+
+const std::string& Manifest::GetVersion() const
+{
+  return m_version;
+}
+
+const std::string& Manifest::GetID() const
+{
+  return m_id;
+}
+
+const std::string& Manifest::GetError() const
+{
+  return m_error;
+}
+
+const std::optional<std::string>& Manifest::GetAuthors() const
+{
+  return m_authors;
+}
+
+const std::optional<std::string>& Manifest::GetDescription() const
+{
+  return m_description;
+}
+
+const std::optional<std::string>& Manifest::GetWebsite() const
+{
+  return m_website;
+}
+}  // namespace ResourcePack