2 files changed, 78 insertions, 3 deletions

diff --git a/src/core/hle/service/aoc/aoc_u.cpp b/src/core/hle/service/aoc/aoc_u.cpp
index d9eeac9ec..f7597f9bb 100644
--- a/src/core/hle/service/aoc/aoc_u.cpp
+++ b/src/core/hle/service/aoc/aoc_u.cpp
@@ -2,12 +2,27 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <numeric>
 #include "common/logging/log.h"
+#include "core/file_sys/content_archive.h"
+#include "core/file_sys/nca_metadata.h"
+#include "core/file_sys/partition_filesystem.h"
+#include "core/file_sys/registered_cache.h"
 #include "core/hle/ipc_helpers.h"
+#include "core/hle/kernel/process.h"
 #include "core/hle/service/aoc/aoc_u.h"
+#include "core/hle/service/filesystem/filesystem.h"
+#include "core/loader/loader.h"
 
 namespace Service::AOC {
 
+constexpr u64 DLC_BASE_TITLE_ID_MASK = 0xFFFFFFFFFFFFE000;
+constexpr u64 DLC_BASE_TO_AOC_ID_MASK = 0x1000;
+
+bool CheckAOCTitleIDMatchesBase(u64 base, u64 aoc) {
+    return (aoc & DLC_BASE_TITLE_ID_MASK) == base;
+}
+
 AOC_U::AOC_U() : ServiceFramework("aoc:u") {
     static const FunctionInfo functions[] = {
         {0, nullptr, "CountAddOnContentByApplicationId"},
@@ -17,10 +32,25 @@ AOC_U::AOC_U() : ServiceFramework("aoc:u") {
         {4, nullptr, "GetAddOnContentBaseIdByApplicationId"},
         {5, nullptr, "GetAddOnContentBaseId"},
         {6, nullptr, "PrepareAddOnContentByApplicationId"},
-        {7, nullptr, "PrepareAddOnContent"},
+        {7, &AOC_U::PrepareAddOnContent, "PrepareAddOnContent"},
         {8, nullptr, "GetAddOnContentListChangedEvent"},
     };
     RegisterHandlers(functions);
+
+    // Accumulate AOC title ids
+    const auto rcu = FileSystem::GetUnionContents();
+    const auto list =
+        rcu->ListEntriesFilter(FileSys::TitleType::AOC, FileSys::ContentRecordType::Data);
+    std::transform(list.begin(), list.end(), std::back_inserter(add_on_content),
+                   [](const FileSys::RegisteredCacheEntry& rce) { return rce.title_id; });
+    add_on_content.erase(
+        std::remove_if(
+            add_on_content.begin(), add_on_content.end(),
+            [&rcu](u64 tid) {
+                return rcu->GetEntry(tid, FileSys::ContentRecordType::Data)->GetStatus() !=
+                       Loader::ResultStatus::Success;
+            }),
+        add_on_content.end());
 }
 
 AOC_U::~AOC_U() = default;
@@ -28,15 +58,57 @@ AOC_U::~AOC_U() = default;
 void AOC_U::CountAddOnContent(Kernel::HLERequestContext& ctx) {
     IPC::ResponseBuilder rb{ctx, 4};
     rb.Push(RESULT_SUCCESS);
-    rb.Push<u64>(0);
-    LOG_WARNING(Service_AOC, "(STUBBED) called");
+
+    const auto current = Core::System::GetInstance().CurrentProcess()->program_id;
+    rb.Push<u32>(std::count_if(add_on_content.begin(), add_on_content.end(), [&current](u64 tid) {
+        return (tid & DLC_BASE_TITLE_ID_MASK) == current;
+    }));
 }
 
 void AOC_U::ListAddOnContent(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto offset = rp.PopRaw<u32>();
+    auto count = rp.PopRaw<u32>();
+
+    const auto current = Core::System::GetInstance().CurrentProcess()->program_id;
+
+    std::vector<u32> out;
+    for (size_t i = 0; i < add_on_content.size(); ++i) {
+        if ((add_on_content[i] & DLC_BASE_TITLE_ID_MASK) == current)
+            out.push_back(static_cast<u32>(add_on_content[i] & 0x7FF));
+    }
+
+    if (out.size() <= offset) {
+        IPC::ResponseBuilder rb{ctx, 2};
+        // TODO(DarkLordZach): Find the correct error code.
+        rb.Push(ResultCode(-1));
+        return;
+    }
+
+    count = std::min<size_t>(out.size() - offset, count);
+    out = std::vector<u32>(out.begin() + offset, out.begin() + offset + count);
+
+    ctx.WriteBuffer(out);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
     IPC::ResponseBuilder rb{ctx, 4};
     rb.Push(RESULT_SUCCESS);
     rb.Push<u64>(0);
     LOG_WARNING(Service_AOC, "(STUBBED) called");
+
+void AOC_U::PrepareAddOnContent(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+
+    const auto aoc_id = rp.PopRaw<u32>();
+
+    LOG_WARNING(Service_AOC, "(STUBBED) called with aoc_id={:08X}", aoc_id);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
 }
 
 void InstallInterfaces(SM::ServiceManager& service_manager) {
diff --git a/src/core/hle/service/aoc/aoc_u.h b/src/core/hle/service/aoc/aoc_u.h
index 29ce8f488..61e2ec75d 100644
--- a/src/core/hle/service/aoc/aoc_u.h
+++ b/src/core/hle/service/aoc/aoc_u.h
@@ -16,6 +16,9 @@ public:
 private:
     void CountAddOnContent(Kernel::HLERequestContext& ctx);
     void ListAddOnContent(Kernel::HLERequestContext& ctx);
+    void PrepareAddOnContent(Kernel::HLERequestContext& ctx);
+
+    std::vector<u64> add_on_content;
 };
 
 /// Registers all AOC services with the specified service manager.