1 files changed, 177 insertions, 0 deletions
diff --git a/src/core/hle/service/nvnflinger/parcel.h b/src/core/hle/service/nvnflinger/parcel.h
new file mode 100644
index 000000000..d1b6201e0
--- /dev/null
+++ b/src/core/hle/service/nvnflinger/parcel.h
@@ -0,0 +1,177 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <span>
+#include <vector>
+
+#include "common/alignment.h"
+#include "common/assert.h"
+#include "common/common_types.h"
+
+namespace Service::android {
+
+struct ParcelHeader {
+    u32 data_size;
+    u32 data_offset;
+    u32 objects_size;
+    u32 objects_offset;
+};
+static_assert(sizeof(ParcelHeader) == 16, "ParcelHeader has wrong size");
+
+class InputParcel final {
+public:
+    explicit InputParcel(std::span<const u8> in_data) : read_buffer(std::move(in_data)) {
+        DeserializeHeader();
+        [[maybe_unused]] const std::u16string token = ReadInterfaceToken();
+    }
+
+    template <typename T>
+    void Read(T& val) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+        ASSERT(read_index + sizeof(T) <= read_buffer.size());
+
+        std::memcpy(&val, read_buffer.data() + read_index, sizeof(T));
+        read_index += sizeof(T);
+        read_index = Common::AlignUp(read_index, 4);
+    }
+
+    template <typename T>
+    T Read() {
+        T val;
+        Read(val);
+        return val;
+    }
+
+    template <typename T>
+    void ReadFlattened(T& val) {
+        const auto flattened_size = Read<s64>();
+        ASSERT(sizeof(T) == flattened_size);
+        Read(val);
+    }
+
+    template <typename T>
+    T ReadFlattened() {
+        T val;
+        ReadFlattened(val);
+        return val;
+    }
+
+    template <typename T>
+    T ReadUnaligned() {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+        ASSERT(read_index + sizeof(T) <= read_buffer.size());
+
+        T val;
+        std::memcpy(&val, read_buffer.data() + read_index, sizeof(T));
+        read_index += sizeof(T);
+        return val;
+    }
+
+    template <typename T>
+    const std::shared_ptr<T> ReadObject() {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        const auto is_valid{Read<bool>()};
+
+        if (is_valid) {
+            auto result = std::make_shared<T>();
+            ReadFlattened(*result);
+            return result;
+        }
+
+        return {};
+    }
+
+    std::u16string ReadInterfaceToken() {
+        [[maybe_unused]] const u32 unknown = Read<u32>();
+        const u32 length = Read<u32>();
+
+        std::u16string token;
+        token.reserve(length + 1);
+
+        for (u32 ch = 0; ch < length + 1; ++ch) {
+            token.push_back(ReadUnaligned<u16>());
+        }
+
+        read_index = Common::AlignUp(read_index, 4);
+
+        return token;
+    }
+
+    void DeserializeHeader() {
+        ASSERT(read_buffer.size() > sizeof(ParcelHeader));
+
+        ParcelHeader header{};
+        std::memcpy(&header, read_buffer.data(), sizeof(ParcelHeader));
+
+        read_index = header.data_offset;
+    }
+
+private:
+    std::span<const u8> read_buffer;
+    std::size_t read_index = 0;
+};
+
+class OutputParcel final {
+public:
+    static constexpr std::size_t DefaultBufferSize = 0x40;
+
+    OutputParcel() : buffer(DefaultBufferSize) {}
+
+    template <typename T>
+    explicit OutputParcel(const T& out_data) : buffer(DefaultBufferSize) {
+        Write(out_data);
+    }
+
+    template <typename T>
+    void Write(const T& val) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        if (buffer.size() < write_index + sizeof(T)) {
+            buffer.resize(buffer.size() + sizeof(T) + DefaultBufferSize);
+        }
+
+        std::memcpy(buffer.data() + write_index, &val, sizeof(T));
+        write_index += sizeof(T);
+        write_index = Common::AlignUp(write_index, 4);
+    }
+
+    template <typename T>
+    void WriteObject(const T* ptr) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+
+        if (!ptr) {
+            Write<u32>(0);
+            return;
+        }
+
+        Write<u32>(1);
+        Write<s64>(sizeof(T));
+        Write(*ptr);
+    }
+
+    template <typename T>
+    void WriteObject(const std::shared_ptr<T> ptr) {
+        WriteObject(ptr.get());
+    }
+
+    std::vector<u8> Serialize() const {
+        ParcelHeader header{};
+        header.data_size = static_cast<u32>(write_index - sizeof(ParcelHeader));
+        header.data_offset = sizeof(ParcelHeader);
+        header.objects_size = 4;
+        header.objects_offset = static_cast<u32>(sizeof(ParcelHeader) + header.data_size);
+        std::memcpy(buffer.data(), &header, sizeof(ParcelHeader));
+
+        return buffer;
+    }
+
+private:
+    mutable std::vector<u8> buffer;
+    std::size_t write_index = sizeof(ParcelHeader);
+};
+
+} // namespace Service::android