Atmosphere/libraries/libstratosphere/source/ncm/ncm_extended_data_mapper.hpp

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/*
* Copyright (c) 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/>.
*/
#pragma once
#include <stratosphere.hpp>
#include "ncm_file_mapper_file.hpp"
#include "ncm_fs_utils.hpp"
namespace ams::ncm {
namespace impl {
template<typename T>
concept IsMappedMemorySpan = std::same_as<T, Span<u8>>;
constexpr inline u64 InitialIdCounterValue = 0x12345;
}
class SingleCacheMapperBase : public IMapper {
private:
bool m_is_mapped;
MappedMemory m_mapped_memory;
size_t m_accessible_size;
bool m_is_using;
bool m_is_dirty;
u64 m_id_counter;
u8 *m_buffer;
size_t m_buffer_size;
public:
SingleCacheMapperBase(Span<u8> span) : m_is_mapped(false), m_mapped_memory{}, m_accessible_size(0), m_is_using(false), m_is_dirty(false), m_id_counter(impl::InitialIdCounterValue), m_buffer(span.data()), m_buffer_size(span.size_bytes()) {
/* ... */
}
protected:
void Finalize() {
/* If we're unused and mapped, we should unmap. */
if (!m_is_using && m_is_mapped) {
this->Unmap();
}
}
private:
Result Unmap() {
/* Check pre-conditions. */
AMS_ASSERT(m_is_mapped);
/* If we're dirty, we'll need to flush the entry. */
if (m_is_dirty) {
/* Unmap our memory. */
MappedMemory mem = m_mapped_memory;
if (mem.offset + mem.buffer_size > m_accessible_size) {
mem.buffer_size = m_accessible_size - mem.offset;
}
R_TRY(this->UnmapImpl(std::addressof(mem)));
}
/* Set as dirty/not mapped. */
m_is_dirty = false;
m_is_mapped = false;
2022-03-23 17:39:20 +00:00
R_SUCCEED();
}
Result GetMappedMemoryImpl(MappedMemory *out, size_t offset, size_t size) {
/* Check pre-conditions. */
AMS_ASSERT(m_is_mapped);
/* Ensure the accessible size works. */
const bool can_update = this->IsAccessibleSizeUpdatable();
R_UNLESS((offset + size <= m_accessible_size || can_update), ncm::ResultMapperInvalidArgument());
/* Update our accessible size. */
m_accessible_size = std::max<size_t>(m_accessible_size, size + offset);
/* Set the output memory. */
*out = m_mapped_memory;
out->buffer_size = std::min<size_t>(out->buffer_size, m_accessible_size - out->offset);
R_SUCCEED();
}
public:
virtual Result GetMappedMemory(MappedMemory *out, size_t offset, size_t size) override final {
/* Ensure our memory is valid, if it's already mapped. */
if (m_is_mapped) {
/* If we can re-use the previous mapping, do so. */
if (m_mapped_memory.IsIncluded(offset, size)) {
/* If the memory is in use, we can't get a new mapping. */
R_UNLESS(!m_is_using, ncm::ResultMapperBusy());
/* Get the output memory. */
R_RETURN(this->GetMappedMemoryImpl(out, offset, size));
}
/* We don't have the correct data mapped, so we need to map. */
R_TRY(this->Unmap());
}
/* Map. */
R_TRY(this->MapImpl(std::addressof(m_mapped_memory), Span<u8>(m_buffer, m_buffer_size), offset, size));
/* Set our mapping id. */
m_mapped_memory.id = m_id_counter++;
/* Get the output memory. */
R_RETURN(this->GetMappedMemoryImpl(out, offset, size));
}
virtual Result MarkUsing(u64 id) override final {
/* Check that the mapping is correct. */
R_UNLESS(m_is_mapped, ncm::ResultMapperNotMapped());
R_UNLESS(m_mapped_memory.id == id, ncm::ResultMapperNotMapped());
/* Mark as using. */
m_is_using = true;
R_SUCCEED();
}
virtual Result UnmarkUsing(u64 id) override final {
/* Check that the mapping is correct. */
R_UNLESS(m_is_mapped, ncm::ResultMapperNotMapped());
R_UNLESS(m_mapped_memory.id == id, ncm::ResultMapperNotMapped());
/* Mark as not using. */
m_is_using = false;
R_SUCCEED();
}
virtual Result MarkDirty(u64 id) override final {
/* Check that the mapping is correct. */
R_UNLESS(m_is_mapped, ncm::ResultMapperNotMapped());
R_UNLESS(m_mapped_memory.id == id, ncm::ResultMapperNotMapped());
/* Mark as dirty. */
m_is_dirty = true;
R_SUCCEED();
}
};
template<size_t MaxEntries>
class MultiCacheReadonlyMapperBase : public IMapper {
private:
struct Entry {
MappedMemory memory;
u64 lru_counter;
u32 use_count;
bool is_mapped;
u8 *buffer;
size_t buffer_size;
};
private:
Entry m_entry_storages[MaxEntries];
Entry * const m_entries;
size_t m_entry_count;
u64 m_id_counter;
u64 m_lru_counter;
size_t m_accessible_size;
public:
template<impl::IsMappedMemorySpan... Args>
MultiCacheReadonlyMapperBase(Args... args) : m_entries(m_entry_storages), m_entry_count(sizeof...(Args)), m_id_counter(impl::InitialIdCounterValue), m_lru_counter(1), m_accessible_size(0) {
/* Check the argument count is valid. */
static_assert(sizeof...(Args) <= MaxEntries);
/* Initialize entries. */
auto InitializeEntry = [](Entry *entry, Span<u8> span) ALWAYS_INLINE_LAMBDA -> void {
*entry = {};
entry->buffer = span.data();
entry->buffer_size = span.size_bytes();
};
Entry *cur_entry = m_entries;
(InitializeEntry(cur_entry++, args), ...);
}
size_t GetSize() {
return m_accessible_size;
}
protected:
void SetSize(size_t size) {
m_accessible_size = size;
}
void Finalize() {
/* Mark all entries as unmapped. */
for (size_t i = 0; i < m_entry_count; ++i) {
/* We can't mark unmapped an entry which is in use. */
if (m_entries[i].use_count > 0) {
break;
}
if (m_entries[i].is_mapped) {
m_entries[i].is_mapped = false;
}
}
}
private:
Result GetMappedMemoryImpl(MappedMemory *out, const MappedMemory &src) {
/* Set the output memory. */
*out = src;
out->buffer_size = std::min<size_t>(out->buffer_size, m_accessible_size - out->offset);
R_SUCCEED();
}
public:
virtual Result GetMappedMemory(MappedMemory *out, size_t offset, size_t size) override final {
/* Try to find an entry which contains the desired region. */
for (size_t i = 0; i < m_entry_count; ++i) {
if (m_entries[i].is_mapped && m_entries[i].memory.IsIncluded(offset, size)) {
R_RETURN(this->GetMappedMemoryImpl(out, m_entries[i].memory));
}
}
/* Find the oldest entry. */
Entry *oldest = nullptr;
Entry *best_entry = nullptr;
for (size_t i = 0; i < m_entry_count; ++i) {
if (m_entries[i].is_mapped) {
if (m_entries[i].use_count == 0) {
if (oldest == nullptr || m_entries[i].lru_counter < oldest->lru_counter) {
oldest = std::addressof(m_entries[i]);
}
}
} else {
best_entry = std::addressof(m_entries[i]);
}
}
/* If we didn't find a free entry, use the oldest. */
best_entry = best_entry != nullptr ? best_entry : oldest;
R_UNLESS(best_entry != nullptr, ncm::ResultMapperBusy());
/* Ensure the best entry isn't mapped. */
if (best_entry->is_mapped) {
best_entry->is_mapped = false;
}
/* Map. */
R_TRY(this->MapImpl(std::addressof(best_entry->memory), Span<u8>(best_entry->buffer, best_entry->buffer_size), offset, size));
/* Set our mapping id. */
best_entry->memory.id = m_id_counter++;
/* Get the output memory. */
R_RETURN(this->GetMappedMemoryImpl(out, best_entry->memory));
}
virtual Result MarkUsing(u64 id) override final {
/* Try to unmark the entry. */
for (size_t i = 0; i < m_entry_count; ++i) {
if (m_entries[i].memory.id == id) {
++m_entries[i].use_count;
m_entries[i].lru_counter = m_lru_counter++;
R_SUCCEED();
}
}
/* We failed to unmark. */
R_THROW(ncm::ResultMapperNotMapped());
}
virtual Result UnmarkUsing(u64 id) override final {
/* Try to unmark the entry. */
for (size_t i = 0; i < m_entry_count; ++i) {
if (m_entries[i].memory.id == id) {
--m_entries[i].use_count;
R_SUCCEED();
}
}
/* We failed to unmark. */
R_THROW(ncm::ResultMapperNotMapped());
}
virtual Result MarkDirty(u64) override final{
R_THROW(ncm::ResultMapperNotSupported());
}
};
template<typename CacheMapperBase>
class ExtendedDataMapperBase : public CacheMapperBase {
private:
static constexpr size_t MappingAlignment = 1_KB;
private:
util::optional<impl::MountNameString> m_mount_name = util::nullopt;
ncm::FileMapperFile m_file_mapper{};
size_t m_extended_data_offset;
bool m_suppress_fs_auto_abort;
public:
template<typename... Args>
ExtendedDataMapperBase(Args &&... args) : CacheMapperBase(std::forward<Args>(args)...) { /* ... */ }
virtual ~ExtendedDataMapperBase() override {
/* Finalize. */
this->Finalize();
}
Result Initialize(const char *content_path, fs::ContentAttributes attr, bool suppress_fs_auto_abort) {
/* Set whether we should suppress fs aborts. */
m_suppress_fs_auto_abort = suppress_fs_auto_abort;
/* Suppress fs auto abort, if we need to. */
auto disable_aborts = this->GetFsAutoAbortDisabler();
/* Mount the content. */
auto mount_name = impl::CreateUniqueMountName();
R_TRY(impl::MountContentMetaImpl(mount_name.str, content_path, attr));
/* Set our mount name. */
m_mount_name.emplace(mount_name.str);
/* Open the root directory. */
auto root_path = impl::GetRootDirectoryPath(mount_name);
fs::DirectoryHandle dir;
R_TRY(fs::OpenDirectory(std::addressof(dir), root_path.str, fs::OpenDirectoryMode_File));
ON_SCOPE_EXIT { fs::CloseDirectory(dir); };
/* Loop directory reading until we find the entry we're looking for. */
while (true) {
/* Read one entry, and finish when we fail to read. */
fs::DirectoryEntry entry;
s64 num_read;
R_TRY(fs::ReadDirectory(std::addressof(num_read), std::addressof(entry), dir, 1));
if (num_read == 0) {
break;
}
/* If this is the content meta file, parse it. */
if (IsContentMetaFileName(entry.name)) {
/* Create the file path. */
impl::FilePathString file_path(root_path.str);
file_path.Append(entry.name);
/* Setup our file mapped. */
R_TRY(m_file_mapper.Initialize(file_path, FileMapperFile::OpenMode::Read));
/* Read the extended header. */
PackagedContentMetaHeader pkg_header;
R_TRY(m_file_mapper.Read(0, std::addressof(pkg_header), sizeof(pkg_header)));
/* Set our extended data offset. */
m_extended_data_offset = PackagedContentMetaReader(std::addressof(pkg_header), sizeof(pkg_header)).GetExtendedDataOffset();
const size_t accessible_size = m_file_mapper.GetFileSize() >= m_extended_data_offset;
R_UNLESS(accessible_size, ncm::ResultInvalidContentMetaFileSize());
/* Set our accessible size. */
this->SetSize(accessible_size);
R_SUCCEED();
}
}
R_THROW(ncm::ResultContentMetaNotFound());
}
void Finalize() {
/* Suppress fs auto abort, if we need to. */
auto disable_aborts = this->GetFsAutoAbortDisabler();
/* Finalize our implementation. */
CacheMapperBase::Finalize();
/* Finalize our file mapper. */
m_file_mapper.Finalize();
/* Finalize our mount name. */
if (m_mount_name.has_value()) {
fs::Unmount(m_mount_name.value().Get());
m_mount_name = util::nullopt;
}
}
protected:
virtual Result MapImpl(MappedMemory *out, Span<u8> data, size_t offset, size_t size) override final {
/* Suppress fs auto abort, if we need to. */
auto disable_aborts = this->GetFsAutoAbortDisabler();
/* Get the requested map offset/size. */
u8 *map_data = data.data();
size_t map_size = data.size_bytes();
/* Align the mapping, and ensure it remains valid. */
const size_t aligned_offset = util::AlignDown(offset, MappingAlignment);
R_UNLESS((offset + size) - aligned_offset <= map_size, ncm::ResultMapperInvalidArgument());
/* Read the data. */
const size_t map_offset = m_extended_data_offset + aligned_offset;
if (map_offset + map_size >= m_file_mapper.GetFileSize()) {
map_size = m_file_mapper.GetFileSize() - map_offset;
}
R_TRY(m_file_mapper.Read(map_offset, map_data, map_size));
/* Create the output mapped memory. */
*out = MappedMemory {
.id = 0,
.offset = aligned_offset,
.buffer = map_data,
.buffer_size = map_size,
};
R_SUCCEED();
}
virtual Result UnmapImpl(MappedMemory *) override final {
R_THROW(ncm::ResultMapperNotSupported());
}
virtual bool IsAccessibleSizeUpdatable() override final {
return false;
}
private:
util::optional<fs::ScopedAutoAbortDisabler> GetFsAutoAbortDisabler() {
/* Create an abort disabler, if we should disable aborts. */
util::optional<fs::ScopedAutoAbortDisabler> disable_abort{util::nullopt};
if (m_suppress_fs_auto_abort) {
disable_abort.emplace();
}
return disable_abort;
}
};
template<size_t N>
using MultiCacheReadonlyMapper = ExtendedDataMapperBase<MultiCacheReadonlyMapperBase<N>>;
}