htc: implement service channel parsing (ReceiveReadyPacket)

libraries/libstratosphere/source/htclow/ctrl/htclow_json.cpp

@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <stratosphere.hpp>
+#include "htclow_json.hpp"
+
+namespace ams::htclow::ctrl {
+
+    namespace {
+
+        constexpr const char ChannelKey[] = "Chan";
+        constexpr const char ProtocolVersionKey[] = "Prot";
+
+    }
+
+    bool JsonHandler::Key(const Ch *str, rapidjson::SizeType len, bool copy) {
+        if (m_state == State::ParseObject) {
+            if (!util::Strncmp(str, ChannelKey, sizeof(ChannelKey))) {
+                m_state = State::ParseServiceChannels;
+            }
+            if (!util::Strncmp(str, ProtocolVersionKey, sizeof(ProtocolVersionKey))) {
+                m_state = State::ParseProtocolVersion;
+            }
+        }
+        return true;
+    }
+
+    bool JsonHandler::Uint(unsigned val) {
+        if (m_state == State::ParseProtocolVersion) {
+            *m_version = val;
+        }
+        return true;
+    }
+
+    bool JsonHandler::String(const Ch *str, rapidjson::SizeType len, bool copy) {
+        if (m_state == State::ParseServiceChannelsArray && *m_num_strings < m_max_strings) {
+            m_strings[(*m_num_strings)++] = str;
+        }
+        return true;
+    }
+
+    bool JsonHandler::StartObject() {
+        if (m_state == State::Begin) {
+            m_state = State::ParseObject;
+        }
+        return true;
+    }
+
+    bool JsonHandler::EndObject(rapidjson::SizeType) {
+        m_state = State::End;
+        return true;
+    }
+
+    bool JsonHandler::StartArray() {
+        if (m_state == State::ParseServiceChannels) {
+            m_state = State::ParseServiceChannelsArray;
+        }
+        return true;
+    }
+
+    bool JsonHandler::EndArray(rapidjson::SizeType len) {
+        if (m_state == State::ParseServiceChannelsArray && len) {
+            m_state = State::ParseObject;
+        }
+        return true;
+    }
+
+}