core: Add support for proper SeedDB import

This now merges the SeedDB to import with the one already existing

src/core/ncch/seed_db.cpp

@@ -0,0 +1,117 @@
+// Copyright 2018 Citra Emulator Project / 2020 Pengfei Zhu
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+// Modified from Citra's implementation to allow multiple instances
+
+#include <fmt/format.h>
+#include "common/file_util.h"
+#include "common/logging/log.h"
+#include "core/ncch/seed_db.h"
+
+namespace Core {
+
+bool SeedDB::Load(const std::string& path) {
+    seeds.clear();
+    if (!FileUtil::Exists(path)) {
+        if (!FileUtil::CreateFullPath(path)) {
+            LOG_ERROR(Service_FS, "Failed to create seed database");
+            return false;
+        }
+        if (!Save(path)) {
+            LOG_ERROR(Service_FS, "Failed to save seed database");
+            return false;
+        }
+        return true;
+    }
+    FileUtil::IOFile file{path, "rb"};
+    if (!file.IsOpen()) {
+        LOG_ERROR(Service_FS, "Failed to open seed database");
+        return false;
+    }
+    u32 count;
+    if (!file.ReadBytes(&count, sizeof(count))) {
+        LOG_ERROR(Service_FS, "Failed to read seed database count fully");
+        return false;
+    }
+    if (!file.Seek(SEEDDB_PADDING_BYTES, SEEK_CUR)) {
+        LOG_ERROR(Service_FS, "Failed to skip seed database padding");
+        return false;
+    }
+    for (u32 i = 0; i < count; ++i) {
+        Seed seed;
+        if (!file.ReadBytes(&seed.title_id, sizeof(seed.title_id))) {
+            LOG_ERROR(Service_FS, "Failed to read seed {} title ID", i);
+            return false;
+        }
+        if (!file.ReadBytes(seed.data.data(), seed.data.size())) {
+            LOG_ERROR(Service_FS, "Failed to read seed {} data", i);
+            return false;
+        }
+        if (!file.ReadBytes(seed.reserved.data(), seed.reserved.size())) {
+            LOG_ERROR(Service_FS, "Failed to read seed {} reserved data", i);
+            return false;
+        }
+        seeds.push_back(seed);
+    }
+    return true;
+}
+
+bool SeedDB::Save(const std::string& path) {
+    if (!FileUtil::CreateFullPath(path)) {
+        LOG_ERROR(Service_FS, "Failed to create seed database");
+        return false;
+    }
+    FileUtil::IOFile file{path, "wb"};
+    if (!file.IsOpen()) {
+        LOG_ERROR(Service_FS, "Failed to open seed database");
+        return false;
+    }
+    u32 count{static_cast<u32>(seeds.size())};
+    if (file.WriteBytes(&count, sizeof(count)) != sizeof(count)) {
+        LOG_ERROR(Service_FS, "Failed to write seed database count fully");
+        return false;
+    }
+    std::array<u8, SEEDDB_PADDING_BYTES> padding{};
+    if (file.WriteBytes(padding.data(), padding.size()) != padding.size()) {
+        LOG_ERROR(Service_FS, "Failed to write seed database padding fully");
+        return false;
+    }
+    for (std::size_t i = 0; i < count; ++i) {
+        if (file.WriteBytes(&seeds[i].title_id, sizeof(seeds[i].title_id)) !=
+            sizeof(seeds[i].title_id)) {
+            LOG_ERROR(Service_FS, "Failed to write seed {} title ID fully", i);
+            return false;
+        }
+        if (file.WriteBytes(seeds[i].data.data(), seeds[i].data.size()) != seeds[i].data.size()) {
+            LOG_ERROR(Service_FS, "Failed to write seed {} data fully", i);
+            return false;
+        }
+        if (file.WriteBytes(seeds[i].reserved.data(), seeds[i].reserved.size()) !=
+            seeds[i].reserved.size()) {
+            LOG_ERROR(Service_FS, "Failed to write seed {} reserved data fully", i);
+            return false;
+        }
+    }
+    return true;
+}
+
+void SeedDB::Add(const Seed& seed) {
+    seeds.push_back(seed);
+}
+
+std::size_t SeedDB::Size() const {
+    return seeds.size();
+}
+
+std::optional<Seed::Data> SeedDB::Get(u64 title_id) const {
+    const auto found_seed_iter =
+        std::find_if(seeds.begin(), seeds.end(),
+                     [title_id](const auto& seed) { return seed.title_id == title_id; });
+    if (found_seed_iter != seeds.end()) {
+        return found_seed_iter->data;
+    }
+    return std::nullopt;
+}
+
+} // namespace Core