service: Use ReadBufferSpan where it is trivial to do so

src/core/hle/kernel/hle_ipc.cpp

@@ -346,7 +346,6 @@ std::vector<u8> HLERequestContext::ReadBuffer(std::size_t buffer_index) const {
 }
 
 std::span<const u8> HLERequestContext::ReadBufferSpan(std::size_t buffer_index) const {
-    LOG_CRITICAL(Debug, "called");
     const bool is_buffer_a{BufferDescriptorA().size() > buffer_index &&
                            BufferDescriptorA()[buffer_index].Size()};
     if (is_buffer_a) {

src/core/hle/service/acc/acc.cpp

@@ -367,7 +367,7 @@ protected:
         IPC::RequestParser rp{ctx};
         const auto base = rp.PopRaw<ProfileBase>();
 
-        const auto user_data = ctx.ReadBuffer();
+        const auto user_data = ctx.ReadBufferSpan();
 
         LOG_DEBUG(Service_ACC, "called, username='{}', timestamp={:016X}, uuid=0x{}",
                   Common::StringFromFixedZeroTerminatedBuffer(
@@ -399,8 +399,8 @@ protected:
         IPC::RequestParser rp{ctx};
         const auto base = rp.PopRaw<ProfileBase>();
 
-        const auto user_data = ctx.ReadBuffer();
+        const auto user_data = ctx.ReadBufferSpan();
-        const auto image_data = ctx.ReadBuffer(1);
+        const auto image_data = ctx.ReadBufferSpan(1);
 
         LOG_DEBUG(Service_ACC, "called, username='{}', timestamp={:016X}, uuid=0x{}",
                   Common::StringFromFixedZeroTerminatedBuffer(

src/core/hle/service/am/am.cpp

@@ -1124,7 +1124,7 @@ void IStorageAccessor::Write(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
 
     const u64 offset{rp.Pop<u64>()};
-    const std::vector<u8> data{ctx.ReadBuffer()};
+    const auto data{ctx.ReadBufferSpan()};
     const std::size_t size{std::min<u64>(data.size(), backing.GetSize() - offset)};
 
     LOG_DEBUG(Service_AM, "called, offset={}, size={}", offset, size);

src/core/hle/service/aoc/aoc_u.cpp

@@ -72,7 +72,7 @@ private:
         IPC::RequestParser rp{ctx};
 
         const auto unknown_1 = rp.Pop<u64>();
-        [[maybe_unused]] const auto unknown_2 = ctx.ReadBuffer();
+        [[maybe_unused]] const auto unknown_2 = ctx.ReadBufferSpan();
 
         LOG_WARNING(Service_AOC, "(STUBBED) called, unknown_1={}", unknown_1);
 
@@ -84,7 +84,7 @@ private:
         IPC::RequestParser rp{ctx};
 
         const auto unknown_1 = rp.Pop<u64>();
-        [[maybe_unused]] const auto unknown_2 = ctx.ReadBuffer();
+        [[maybe_unused]] const auto unknown_2 = ctx.ReadBufferSpan();
 
         LOG_WARNING(Service_AOC, "(STUBBED) called, unknown_1={}", unknown_1);
 

src/core/hle/service/audio/audin_u.cpp

@@ -98,7 +98,7 @@ private:
             LOG_ERROR(Service_Audio, "Input buffer is too small for an AudioInBuffer!");
         }
 
-        const auto& in_buffer = ctx.ReadBuffer();
+        const auto& in_buffer = ctx.ReadBufferSpan();
         AudioInBuffer buffer{};
         std::memcpy(&buffer, in_buffer.data(), sizeof(AudioInBuffer));
 
@@ -266,7 +266,7 @@ void AudInU::OpenAudioIn(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     auto in_params{rp.PopRaw<AudioInParameter>()};
     auto applet_resource_user_id{rp.PopRaw<u64>()};
-    const auto device_name_data{ctx.ReadBuffer()};
+    const auto device_name_data{ctx.ReadBufferSpan()};
     auto device_name = Common::StringFromBuffer(device_name_data);
     auto handle{ctx.GetCopyHandle(0)};
 
@@ -317,7 +317,7 @@ void AudInU::OpenAudioInProtocolSpecified(Kernel::HLERequestContext& ctx) {
     auto protocol_specified{rp.PopRaw<u64>()};
     auto in_params{rp.PopRaw<AudioInParameter>()};
     auto applet_resource_user_id{rp.PopRaw<u64>()};
-    const auto device_name_data{ctx.ReadBuffer()};
+    const auto device_name_data{ctx.ReadBufferSpan()};
     auto device_name = Common::StringFromBuffer(device_name_data);
     auto handle{ctx.GetCopyHandle(0)};
 

src/core/hle/service/audio/audout_u.cpp

@@ -105,7 +105,7 @@ private:
             LOG_ERROR(Service_Audio, "Input buffer is too small for an AudioOutBuffer!");
         }
 
-        const auto& in_buffer = ctx.ReadBuffer();
+        const auto& in_buffer = ctx.ReadBufferSpan();
         AudioOutBuffer buffer{};
         std::memcpy(&buffer, in_buffer.data(), sizeof(AudioOutBuffer));
 
@@ -264,7 +264,7 @@ void AudOutU::OpenAudioOut(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     auto in_params{rp.PopRaw<AudioOutParameter>()};
     auto applet_resource_user_id{rp.PopRaw<u64>()};
-    const auto device_name_data{ctx.ReadBuffer()};
+    const auto device_name_data{ctx.ReadBufferSpan()};
     auto device_name = Common::StringFromBuffer(device_name_data);
     auto handle{ctx.GetCopyHandle(0)};
 

src/core/hle/service/audio/audren_u.cpp

@@ -112,7 +112,7 @@ private:
     void RequestUpdate(Kernel::HLERequestContext& ctx) {
         LOG_TRACE(Service_Audio, "called");
 
-        std::vector<u8> input{ctx.ReadBuffer(0)};
+        const auto input{ctx.ReadBufferSpan(0)};
 
         // These buffers are written manually to avoid an issue with WriteBuffer throwing errors for
         // checking size 0. Performance size is 0 for most games.
@@ -306,7 +306,7 @@ private:
         IPC::RequestParser rp{ctx};
         const f32 volume = rp.Pop<f32>();
 
-        const auto device_name_buffer = ctx.ReadBuffer();
+        const auto device_name_buffer = ctx.ReadBufferSpan();
         const std::string name = Common::StringFromBuffer(device_name_buffer);
 
         LOG_DEBUG(Service_Audio, "called. name={}, volume={}", name, volume);
@@ -320,7 +320,7 @@ private:
     }
 
     void GetAudioDeviceOutputVolume(Kernel::HLERequestContext& ctx) {
-        const auto device_name_buffer = ctx.ReadBuffer();
+        const auto device_name_buffer = ctx.ReadBufferSpan();
         const std::string name = Common::StringFromBuffer(device_name_buffer);
 
         LOG_DEBUG(Service_Audio, "called. Name={}", name);

src/core/hle/service/audio/hwopus.cpp

@@ -74,7 +74,7 @@ private:
             ResetDecoderContext();
         }
 
-        if (!DecodeOpusData(consumed, sample_count, ctx.ReadBuffer(), samples, performance)) {
+        if (!DecodeOpusData(consumed, sample_count, ctx.ReadBufferSpan(), samples, performance)) {
             LOG_ERROR(Audio, "Failed to decode opus data");
             IPC::ResponseBuilder rb{ctx, 2};
             // TODO(ogniK): Use correct error code
@@ -93,7 +93,7 @@ private:
         ctx.WriteBuffer(samples);
     }
 
-    bool DecodeOpusData(u32& consumed, u32& sample_count, const std::vector<u8>& input,
+    bool DecodeOpusData(u32& consumed, u32& sample_count, std::span<const u8> input,
                         std::vector<opus_int16>& output, u64* out_performance_time) const {
         const auto start_time = std::chrono::steady_clock::now();
         const std::size_t raw_output_sz = output.size() * sizeof(opus_int16);
@@ -257,7 +257,7 @@ void HwOpus::GetWorkBufferSizeEx(Kernel::HLERequestContext& ctx) {
 
 void HwOpus::GetWorkBufferSizeForMultiStreamEx(Kernel::HLERequestContext& ctx) {
     OpusMultiStreamParametersEx param;
-    std::memcpy(&param, ctx.ReadBuffer().data(), ctx.GetReadBufferSize());
+    std::memcpy(&param, ctx.ReadBufferSpan().data(), ctx.GetReadBufferSize());
 
     const auto sample_rate = param.sample_rate;
     const auto channel_count = param.channel_count;

src/core/hle/service/bcat/bcat_module.cpp

@@ -206,7 +206,7 @@ private:
         IPC::RequestParser rp{ctx};
         const auto title_id = rp.PopRaw<u64>();
 
-        const auto passphrase_raw = ctx.ReadBuffer();
+        const auto passphrase_raw = ctx.ReadBufferSpan();
 
         LOG_DEBUG(Service_BCAT, "called, title_id={:016X}, passphrase={}", title_id,
                   Common::HexToString(passphrase_raw));

src/core/hle/service/es/es.cpp

@@ -121,8 +121,8 @@ private:
     }
 
     void ImportTicket(Kernel::HLERequestContext& ctx) {
-        const auto ticket = ctx.ReadBuffer();
+        const auto ticket = ctx.ReadBufferSpan();
-        const auto cert = ctx.ReadBuffer(1);
+        [[maybe_unused]] const auto cert = ctx.ReadBufferSpan(1);
 
         if (ticket.size() < sizeof(Core::Crypto::Ticket)) {
             LOG_ERROR(Service_ETicket, "The input buffer is not large enough!");

src/core/hle/service/fatal/fatal.cpp

@@ -152,7 +152,7 @@ void Module::Interface::ThrowFatalWithCpuContext(Kernel::HLERequestContext& ctx)
     IPC::RequestParser rp(ctx);
     const auto error_code = rp.Pop<Result>();
     const auto fatal_type = rp.PopEnum<FatalType>();
-    const auto fatal_info = ctx.ReadBuffer();
+    const auto fatal_info = ctx.ReadBufferSpan();
     FatalInfo info{};
 
     ASSERT_MSG(fatal_info.size() == sizeof(FatalInfo), "Invalid fatal info buffer size!");

src/core/hle/service/glue/notif.cpp

@@ -38,7 +38,7 @@ void NOTIF_A::RegisterAlarmSetting(Kernel::HLERequestContext& ctx) {
                "application_parameter_size is bigger than 0x400 bytes");
 
     AlarmSetting new_alarm{};
-    memcpy(&new_alarm, ctx.ReadBuffer(0).data(), sizeof(AlarmSetting));
+    memcpy(&new_alarm, ctx.ReadBufferSpan(0).data(), sizeof(AlarmSetting));
 
     // TODO: Count alarms per game id
     if (alarms.size() >= max_alarms) {
@@ -73,7 +73,7 @@ void NOTIF_A::UpdateAlarmSetting(Kernel::HLERequestContext& ctx) {
                "application_parameter_size is bigger than 0x400 bytes");
 
     AlarmSetting alarm_setting{};
-    memcpy(&alarm_setting, ctx.ReadBuffer(0).data(), sizeof(AlarmSetting));
+    memcpy(&alarm_setting, ctx.ReadBufferSpan(0).data(), sizeof(AlarmSetting));
 
     const auto alarm_it = GetAlarmFromId(alarm_setting.alarm_setting_id);
     if (alarm_it != alarms.end()) {

src/core/hle/service/hid/controllers/npad.cpp

@@ -737,7 +737,7 @@ Core::HID::NpadStyleTag Controller_NPad::GetSupportedStyleSet() const {
     return hid_core.GetSupportedStyleTag();
 }
 
-void Controller_NPad::SetSupportedNpadIdTypes(u8* data, std::size_t length) {
+void Controller_NPad::SetSupportedNpadIdTypes(const u8* const data, std::size_t length) {
     ASSERT(length > 0 && (length % sizeof(u32)) == 0);
     supported_npad_id_types.clear();
     supported_npad_id_types.resize(length / sizeof(u32));

src/core/hle/service/hid/controllers/npad.h

@@ -95,7 +95,7 @@ public:
     void SetSupportedStyleSet(Core::HID::NpadStyleTag style_set);
     Core::HID::NpadStyleTag GetSupportedStyleSet() const;
 
-    void SetSupportedNpadIdTypes(u8* data, std::size_t length);
+    void SetSupportedNpadIdTypes(const u8* const data, std::size_t length);
     void GetSupportedNpadIdTypes(u32* data, std::size_t max_length);
     std::size_t GetSupportedNpadIdTypesSize() const;
 

src/core/hle/service/hid/hid.cpp

@@ -1026,7 +1026,7 @@ void Hid::SetSupportedNpadIdType(Kernel::HLERequestContext& ctx) {
     const auto applet_resource_user_id{rp.Pop<u64>()};
 
     applet_resource->GetController<Controller_NPad>(HidController::NPad)
-        .SetSupportedNpadIdTypes(ctx.ReadBuffer().data(), ctx.GetReadBufferSize());
+        .SetSupportedNpadIdTypes(ctx.ReadBufferSpan().data(), ctx.GetReadBufferSize());
 
     LOG_DEBUG(Service_HID, "called, applet_resource_user_id={}", applet_resource_user_id);
 
@@ -1564,8 +1564,8 @@ void Hid::SendVibrationValues(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto applet_resource_user_id{rp.Pop<u64>()};
 
-    const auto handles = ctx.ReadBuffer(0);
+    const auto handles = ctx.ReadBufferSpan(0);
-    const auto vibrations = ctx.ReadBuffer(1);
+    const auto vibrations = ctx.ReadBufferSpan(1);
 
     std::vector<Core::HID::VibrationDeviceHandle> vibration_device_handles(
         handles.size() / sizeof(Core::HID::VibrationDeviceHandle));
@@ -2104,7 +2104,7 @@ void Hid::WritePalmaRgbLedPatternEntry(Kernel::HLERequestContext& ctx) {
     const auto connection_handle{rp.PopRaw<Controller_Palma::PalmaConnectionHandle>()};
     const auto unknown{rp.Pop<u64>()};
 
-    const auto buffer = ctx.ReadBuffer();
+    [[maybe_unused]] const auto buffer = ctx.ReadBufferSpan();
 
     LOG_WARNING(Service_HID, "(STUBBED) called, connection_handle={}, unknown={}",
                 connection_handle.npad_id, unknown);

src/core/hle/service/jit/jit.cpp

@@ -62,7 +62,7 @@ public:
         const auto parameters{rp.PopRaw<InputParameters>()};
 
         // Optional input/output buffers
-        std::vector<u8> input_buffer{ctx.CanReadBuffer() ? ctx.ReadBuffer() : std::vector<u8>()};
+        const auto input_buffer{ctx.CanReadBuffer() ? ctx.ReadBufferSpan() : std::span<const u8>()};
         std::vector<u8> output_buffer(ctx.CanWriteBuffer() ? ctx.GetWriteBufferSize() : 0);
 
         // Function call prototype:
@@ -132,7 +132,7 @@ public:
         const auto command{rp.PopRaw<u64>()};
 
         // Optional input/output buffers
-        std::vector<u8> input_buffer{ctx.CanReadBuffer() ? ctx.ReadBuffer() : std::vector<u8>()};
+        const auto input_buffer{ctx.CanReadBuffer() ? ctx.ReadBufferSpan() : std::span<const u8>()};
         std::vector<u8> output_buffer(ctx.CanWriteBuffer() ? ctx.GetWriteBufferSize() : 0);
 
         // Function call prototype:
@@ -176,7 +176,7 @@ public:
         IPC::RequestParser rp{ctx};
         const auto tmem_size{rp.PopRaw<u64>()};
         const auto tmem_handle{ctx.GetCopyHandle(0)};
-        const auto nro_plugin{ctx.ReadBuffer(1)};
+        const auto nro_plugin{ctx.ReadBufferSpan(1)};
 
         if (tmem_size == 0) {
             LOG_ERROR(Service_JIT, "attempted to load plugin with empty transfer memory");

src/core/hle/service/ldn/ldn.cpp

@@ -412,7 +412,7 @@ public:
     }
 
     void SetAdvertiseData(Kernel::HLERequestContext& ctx) {
-        std::vector<u8> read_buffer = ctx.ReadBuffer();
+        const auto read_buffer = ctx.ReadBufferSpan();
 
         IPC::ResponseBuilder rb{ctx, 2};
         rb.Push(lan_discovery.SetAdvertiseData(read_buffer));
@@ -464,7 +464,7 @@ public:
                  parameters.security_config.passphrase_size,
                  parameters.security_config.security_mode, parameters.local_communication_version);
 
-        const std::vector<u8> read_buffer = ctx.ReadBuffer();
+        const auto read_buffer = ctx.ReadBufferSpan();
         if (read_buffer.size() != sizeof(NetworkInfo)) {
             LOG_ERROR(Frontend, "NetworkInfo doesn't match read_buffer size!");
             IPC::ResponseBuilder rb{ctx, 2};

src/core/hle/service/lm/lm.cpp

@@ -94,7 +94,7 @@ public:
 private:
     void Log(Kernel::HLERequestContext& ctx) {
         std::size_t offset{};
-        const auto data = ctx.ReadBuffer();
+        const auto data = ctx.ReadBufferSpan();
 
         // This function only succeeds - Get that out of the way
         IPC::ResponseBuilder rb{ctx, 2};

src/core/hle/service/nfc/mifare_user.cpp

@@ -168,7 +168,7 @@ void MFIUser::StopDetection(Kernel::HLERequestContext& ctx) {
 void MFIUser::Read(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
-    const auto buffer{ctx.ReadBuffer()};
+    const auto buffer{ctx.ReadBufferSpan()};
     const auto number_of_commands{ctx.GetReadBufferNumElements<NFP::MifareReadBlockParameter>()};
     std::vector<NFP::MifareReadBlockParameter> read_commands(number_of_commands);
 
@@ -209,7 +209,7 @@ void MFIUser::Read(Kernel::HLERequestContext& ctx) {
 void MFIUser::Write(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
-    const auto buffer{ctx.ReadBuffer()};
+    const auto buffer{ctx.ReadBufferSpan()};
     const auto number_of_commands{ctx.GetReadBufferNumElements<NFP::MifareWriteBlockParameter>()};
     std::vector<NFP::MifareWriteBlockParameter> write_commands(number_of_commands);
 

src/core/hle/service/nfc/nfc_user.cpp

@@ -325,7 +325,7 @@ void IUser::SendCommandByPassThrough(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
     const auto timeout{rp.PopRaw<Time::Clock::TimeSpanType>()};
-    const auto command_data{ctx.ReadBuffer()};
+    const auto command_data{ctx.ReadBufferSpan()};
 
     LOG_INFO(Service_NFC, "(STUBBED) called, device_handle={}, timeout={}, data_size={}",
              device_handle, timeout.ToSeconds(), command_data.size());

src/core/hle/service/nfp/nfp_user.cpp

@@ -290,7 +290,7 @@ void IUser::GetApplicationArea(Kernel::HLERequestContext& ctx) {
 void IUser::SetApplicationArea(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
-    const auto data{ctx.ReadBuffer()};
+    const auto data{ctx.ReadBufferSpan()};
     LOG_INFO(Service_NFP, "called, device_handle={}, data_size={}", device_handle, data.size());
 
     if (state == State::NonInitialized) {
@@ -370,7 +370,7 @@ void IUser::CreateApplicationArea(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
     const auto access_id{rp.Pop<u32>()};
-    const auto data{ctx.ReadBuffer()};
+    const auto data{ctx.ReadBufferSpan()};
     LOG_INFO(Service_NFP, "called, device_handle={}, data_size={}, access_id={}", device_handle,
              access_id, data.size());
 
@@ -637,7 +637,7 @@ void IUser::RecreateApplicationArea(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto device_handle{rp.Pop<u64>()};
     const auto access_id{rp.Pop<u32>()};
-    const auto data{ctx.ReadBuffer()};
+    const auto data{ctx.ReadBufferSpan()};
     LOG_INFO(Service_NFP, "called, device_handle={}, data_size={}, access_id={}", device_handle,
              access_id, data.size());
 

src/core/hle/service/ngct/ngct.cpp

@@ -24,7 +24,7 @@ public:
 
 private:
     void Match(Kernel::HLERequestContext& ctx) {
-        const auto buffer = ctx.ReadBuffer();
+        const auto buffer = ctx.ReadBufferSpan();
         const auto text = Common::StringFromFixedZeroTerminatedBuffer(
             reinterpret_cast<const char*>(buffer.data()), buffer.size());
 
@@ -37,7 +37,7 @@ private:
     }
 
     void Filter(Kernel::HLERequestContext& ctx) {
-        const auto buffer = ctx.ReadBuffer();
+        const auto buffer = ctx.ReadBufferSpan();
         const auto text = Common::StringFromFixedZeroTerminatedBuffer(
             reinterpret_cast<const char*>(buffer.data()), buffer.size());
 

src/core/hle/service/nifm/nifm.cpp

@@ -414,7 +414,7 @@ void IGeneralService::CreateTemporaryNetworkProfile(Kernel::HLERequestContext& c
 
     ASSERT_MSG(ctx.GetReadBufferSize() == 0x17c, "SfNetworkProfileData is not the correct size");
     u128 uuid{};
-    auto buffer = ctx.ReadBuffer();
+    auto buffer = ctx.ReadBufferSpan();
     std::memcpy(&uuid, buffer.data() + 8, sizeof(u128));
 
     IPC::ResponseBuilder rb{ctx, 6, 0, 1};

src/core/hle/service/prepo/prepo.cpp

@@ -57,13 +57,13 @@ private:
         IPC::RequestParser rp{ctx};
         const auto process_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferSpan(0);
         const auto data2 = [&ctx] {
             if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
+                return ctx.ReadBufferSpan(1);
             }
 
-            return std::vector<u8>{};
+            return std::span<const u8>{};
         }();
 
         LOG_DEBUG(Service_PREPO,
@@ -84,13 +84,13 @@ private:
         const auto user_id = rp.PopRaw<u128>();
         const auto process_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferSpan(0);
         const auto data2 = [&ctx] {
             if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
+                return ctx.ReadBufferSpan(1);
             }
 
-            return std::vector<u8>{};
+            return std::span<const u8>{};
         }();
 
         LOG_DEBUG(Service_PREPO,
@@ -136,13 +136,13 @@ private:
         IPC::RequestParser rp{ctx};
         const auto title_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferSpan(0);
         const auto data2 = [&ctx] {
             if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
+                return ctx.ReadBufferSpan(1);
             }
 
-            return std::vector<u8>{};
+            return std::span<const u8>{};
         }();
 
         LOG_DEBUG(Service_PREPO, "called, title_id={:016X}, data1_size={:016X}, data2_size={:016X}",
@@ -160,13 +160,13 @@ private:
         const auto user_id = rp.PopRaw<u128>();
         const auto title_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferSpan(0);
         const auto data2 = [&ctx] {
             if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
+                return ctx.ReadBufferSpan(1);
             }
 
-            return std::vector<u8>{};
+            return std::span<const u8>{};
         }();
 
         LOG_DEBUG(Service_PREPO,

src/core/hle/service/set/set_sys.cpp

@@ -131,12 +131,12 @@ void SET_SYS::GetSettingsItemValueSize(Kernel::HLERequestContext& ctx) {
 
     // The category of the setting. This corresponds to the top-level keys of
     // system_settings.ini.
-    const auto setting_category_buf{ctx.ReadBuffer(0)};
+    const auto setting_category_buf{ctx.ReadBufferSpan(0)};
     const std::string setting_category{setting_category_buf.begin(), setting_category_buf.end()};
 
     // The name of the setting. This corresponds to the second-level keys of
     // system_settings.ini.
-    const auto setting_name_buf{ctx.ReadBuffer(1)};
+    const auto setting_name_buf{ctx.ReadBufferSpan(1)};
     const std::string setting_name{setting_name_buf.begin(), setting_name_buf.end()};
 
     auto settings{GetSettings()};
@@ -156,12 +156,12 @@ void SET_SYS::GetSettingsItemValue(Kernel::HLERequestContext& ctx) {
 
     // The category of the setting. This corresponds to the top-level keys of
     // system_settings.ini.
-    const auto setting_category_buf{ctx.ReadBuffer(0)};
+    const auto setting_category_buf{ctx.ReadBufferSpan(0)};
     const std::string setting_category{setting_category_buf.begin(), setting_category_buf.end()};
 
     // The name of the setting. This corresponds to the second-level keys of
     // system_settings.ini.
-    const auto setting_name_buf{ctx.ReadBuffer(1)};
+    const auto setting_name_buf{ctx.ReadBufferSpan(1)};
     const std::string setting_name{setting_name_buf.begin(), setting_name_buf.end()};
 
     auto settings{GetSettings()};

src/core/hle/service/sockets/sfdnsres.cpp

@@ -199,10 +199,10 @@ static std::pair<u32, s32> GetAddrInfoRequestImpl(Kernel::HLERequestContext& ctx
                 "called with ignored parameters: use_nsd_resolve={}, unknown={}, process_id={}",
                 parameters.use_nsd_resolve, parameters.unknown, parameters.process_id);
 
-    const auto host_buffer = ctx.ReadBuffer(0);
+    const auto host_buffer = ctx.ReadBufferSpan(0);
     const std::string host = Common::StringFromBuffer(host_buffer);
 
-    const auto service_buffer = ctx.ReadBuffer(1);
+    const auto service_buffer = ctx.ReadBufferSpan(1);
     const std::string service = Common::StringFromBuffer(service_buffer);
 
     addrinfo* addrinfo;

src/core/hle/service/ssl/ssl.cpp

@@ -101,7 +101,7 @@ private:
     void ImportServerPki(Kernel::HLERequestContext& ctx) {
         IPC::RequestParser rp{ctx};
         const auto certificate_format = rp.PopEnum<CertificateFormat>();
-        const auto pkcs_12_certificates = ctx.ReadBuffer(0);
+        [[maybe_unused]] const auto pkcs_12_certificates = ctx.ReadBufferSpan(0);
 
         constexpr u64 server_id = 0;
 
@@ -113,13 +113,13 @@ private:
     }
 
     void ImportClientPki(Kernel::HLERequestContext& ctx) {
-        const auto pkcs_12_certificate = ctx.ReadBuffer(0);
+        [[maybe_unused]] const auto pkcs_12_certificate = ctx.ReadBufferSpan(0);
-        const auto ascii_password = [&ctx] {
+        [[maybe_unused]] const auto ascii_password = [&ctx] {
             if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
+                return ctx.ReadBufferSpan(1);
             }
 
-            return std::vector<u8>{};
+            return std::span<const u8>{};
         }();
 
         constexpr u64 client_id = 0;

src/core/hle/service/time/time.cpp

@@ -328,8 +328,8 @@ void Module::Interface::CalculateStandardUserSystemClockDifferenceByUser(
     Clock::ClockSnapshot snapshot_a;
     Clock::ClockSnapshot snapshot_b;
 
-    const auto snapshot_a_data = ctx.ReadBuffer(0);
+    const auto snapshot_a_data = ctx.ReadBufferSpan(0);
-    const auto snapshot_b_data = ctx.ReadBuffer(1);
+    const auto snapshot_b_data = ctx.ReadBufferSpan(1);
 
     std::memcpy(&snapshot_a, snapshot_a_data.data(), sizeof(Clock::ClockSnapshot));
     std::memcpy(&snapshot_b, snapshot_b_data.data(), sizeof(Clock::ClockSnapshot));
@@ -355,8 +355,8 @@ void Module::Interface::CalculateSpanBetween(Kernel::HLERequestContext& ctx) {
     Clock::ClockSnapshot snapshot_a;
     Clock::ClockSnapshot snapshot_b;
 
-    const auto snapshot_a_data = ctx.ReadBuffer(0);
+    const auto snapshot_a_data = ctx.ReadBufferSpan(0);
-    const auto snapshot_b_data = ctx.ReadBuffer(1);
+    const auto snapshot_b_data = ctx.ReadBufferSpan(1);
 
     std::memcpy(&snapshot_a, snapshot_a_data.data(), sizeof(Clock::ClockSnapshot));
     std::memcpy(&snapshot_b, snapshot_b_data.data(), sizeof(Clock::ClockSnapshot));

src/core/hle/service/time/time_zone_service.cpp

@@ -84,7 +84,7 @@ void ITimeZoneService::ToCalendarTime(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_Time, "called, posix_time=0x{:016X}", posix_time);
 
     TimeZone::TimeZoneRule time_zone_rule{};
-    const auto buffer{ctx.ReadBuffer()};
+    const auto buffer{ctx.ReadBufferSpan()};
     std::memcpy(&time_zone_rule, buffer.data(), buffer.size());
 
     TimeZone::CalendarInfo calendar_info{};
@@ -128,7 +128,7 @@ void ITimeZoneService::ToPosixTime(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp{ctx};
     const auto calendar_time{rp.PopRaw<TimeZone::CalendarTime>()};
     TimeZone::TimeZoneRule time_zone_rule{};
-    std::memcpy(&time_zone_rule, ctx.ReadBuffer().data(), sizeof(TimeZone::TimeZoneRule));
+    std::memcpy(&time_zone_rule, ctx.ReadBufferSpan().data(), sizeof(TimeZone::TimeZoneRule));
 
     s64 posix_time{};
     if (const Result result{time_zone_content_manager.GetTimeZoneManager().ToPosixTime(

src/core/reporter.cpp

@@ -312,7 +312,7 @@ void Reporter::SaveUnimplementedAppletReport(
 }
 
 void Reporter::SavePlayReport(PlayReportType type, u64 title_id,
-                              const std::vector<std::vector<u8>>& data,
+                              const std::vector<std::span<const u8>>& data,
                               std::optional<u64> process_id, std::optional<u128> user_id) const {
     if (!IsReportingEnabled()) {
         return;

src/core/reporter.h

@@ -5,6 +5,7 @@
 
 #include <array>
 #include <optional>
+#include <span>
 #include <string>
 #include <vector>
 #include "common/common_types.h"
@@ -56,7 +57,8 @@ public:
         System,
     };
 
-    void SavePlayReport(PlayReportType type, u64 title_id, const std::vector<std::vector<u8>>& data,
+    void SavePlayReport(PlayReportType type, u64 title_id,
+                        const std::vector<std::span<const u8>>& data,
                         std::optional<u64> process_id = {}, std::optional<u128> user_id = {}) const;
 
     // Used by error applet