mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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450 lines
21 KiB
C++
450 lines
21 KiB
C++
/*
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* Copyright (c) 2018-2020 Adubbz, Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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namespace ams::fssystem {
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namespace {
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class PartitionFileSystemDefaultAllocator : public MemoryResource {
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private:
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virtual void *AllocateImpl(size_t size, size_t alignment) override {
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return ::ams::fs::impl::Allocate(size);
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}
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virtual void DeallocateImpl(void *buffer, size_t size, size_t alignment) override {
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::ams::fs::impl::Deallocate(buffer, size);
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}
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virtual bool IsEqualImpl(const MemoryResource &rhs) const override {
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return this == std::addressof(rhs);
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}
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};
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PartitionFileSystemDefaultAllocator g_partition_filesystem_default_allocator;
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}
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template <typename MetaType>
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class PartitionFileSystemCore<MetaType>::PartitionFile : public fs::fsa::IFile, public fs::impl::Newable {
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private:
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const typename MetaType::PartitionEntry *partition_entry;
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const PartitionFileSystemCore<MetaType> *parent;
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const fs::OpenMode mode;
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public:
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PartitionFile(PartitionFileSystemCore<MetaType> *parent, const typename MetaType::PartitionEntry *partition_entry, fs::OpenMode mode) : partition_entry(partition_entry), parent(parent), mode(mode) { /* ... */ }
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private:
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virtual Result DoRead(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) override final;
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virtual Result DoGetSize(s64 *out) override final {
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*out = this->partition_entry->size;
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return ResultSuccess();
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}
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virtual Result DoFlush() override final {
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/* Nothing to do if writing disallowed. */
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R_SUCCEED_IF((this->mode & fs::OpenMode_Write) == 0);
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/* Flush base storage. */
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return this->parent->base_storage->Flush();
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}
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virtual Result DoWrite(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) override final {
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/* Ensure appending is not required. */
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bool needs_append;
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R_TRY(this->DryWrite(std::addressof(needs_append), offset, size, option, this->mode));
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R_UNLESS(!needs_append, fs::ResultUnsupportedOperationInPartitionFileA());
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/* Appending is prohibited. */
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AMS_ASSERT((this->mode & fs::OpenMode_AllowAppend) == 0);
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/* Validate offset and size. */
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R_UNLESS(offset <= static_cast<s64>(this->partition_entry->size), fs::ResultOutOfRange());
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R_UNLESS(static_cast<s64>(offset + size) <= static_cast<s64>(this->partition_entry->size), fs::ResultInvalidSize());
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/* Write to the base storage. */
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return this->parent->base_storage->Write(this->parent->meta_data_size + this->partition_entry->offset + offset, buffer, size);
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}
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virtual Result DoSetSize(s64 size) override final {
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R_TRY(this->DrySetSize(size, this->mode));
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return fs::ResultUnsupportedOperationInPartitionFileA();
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}
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virtual Result DoOperateRange(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override final {
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/* Validate preconditions for operation. */
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switch (op_id) {
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case fs::OperationId::InvalidateCache:
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R_UNLESS((this->mode & fs::OpenMode_Read) != 0, fs::ResultReadNotPermitted());
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R_UNLESS((this->mode & fs::OpenMode_Write) == 0, fs::ResultUnsupportedOperationInPartitionFileB());
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break;
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case fs::OperationId::QueryRange:
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break;
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default:
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return fs::ResultUnsupportedOperationInPartitionFileB();
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}
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/* Validate offset and size. */
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R_UNLESS(offset >= 0, fs::ResultOutOfRange());
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R_UNLESS(offset <= static_cast<s64>(this->partition_entry->size), fs::ResultOutOfRange());
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R_UNLESS(static_cast<s64>(offset + size) <= static_cast<s64>(this->partition_entry->size), fs::ResultInvalidSize());
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R_UNLESS(static_cast<s64>(offset + size) >= offset, fs::ResultInvalidSize());
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return this->parent->base_storage->OperateRange(dst, dst_size, op_id, this->parent->meta_data_size + this->partition_entry->offset + offset, size, src, src_size);
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}
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public:
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virtual sf::cmif::DomainObjectId GetDomainObjectId() const override {
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/* TODO: How should this be handled? */
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return sf::cmif::InvalidDomainObjectId;
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}
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};
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template<>
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Result PartitionFileSystemCore<PartitionFileSystemMeta>::PartitionFile::DoRead(size_t *out, s64 offset, void *dst, size_t dst_size, const fs::ReadOption &option) {
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/* Perform a dry read. */
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size_t read_size = 0;
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R_TRY(this->DryRead(std::addressof(read_size), offset, dst_size, option, this->mode));
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/* Read from the base storage. */
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R_TRY(this->parent->base_storage->Read(this->parent->meta_data_size + this->partition_entry->offset + offset, dst, read_size));
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/* Set output size. */
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*out = read_size;
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return ResultSuccess();
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}
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template<>
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Result PartitionFileSystemCore<Sha256PartitionFileSystemMeta>::PartitionFile::DoRead(size_t *out, s64 offset, void *dst, size_t dst_size, const fs::ReadOption &option) {
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/* Perform a dry read. */
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size_t read_size = 0;
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R_TRY(this->DryRead(std::addressof(read_size), offset, dst_size, option, this->mode));
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const s64 entry_start = this->parent->meta_data_size + this->partition_entry->offset;
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const s64 read_end = static_cast<s64>(offset + read_size);
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const s64 hash_start = static_cast<s64>(this->partition_entry->hash_target_offset);
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const s64 hash_end = hash_start + this->partition_entry->hash_target_size;
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if (read_end <= hash_start || hash_end <= offset) {
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/* We aren't reading hashed data, so we can just read from the base storage. */
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R_TRY(this->parent->base_storage->Read(entry_start + offset, dst, read_size));
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} else {
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/* Only hash target offset == 0 is supported. */
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R_UNLESS(hash_start == 0, fs::ResultInvalidSha256PartitionHashTarget());
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/* Ensure that the hash region is valid. */
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R_UNLESS(this->partition_entry->hash_target_offset + this->partition_entry->hash_target_size <= this->partition_entry->size, fs::ResultInvalidSha256PartitionHashTarget());
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/* Validate our read offset. */
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const s64 read_offset = entry_start + offset;
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R_UNLESS(read_offset >= offset, fs::ResultOutOfRange());
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/* Prepare a buffer for our calculated hash. */
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char hash[crypto::Sha256Generator::HashSize];
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crypto::Sha256Generator generator;
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/* Ensure we can perform our read. */
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const bool hash_in_read = offset <= hash_start && hash_end <= read_end;
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const bool read_in_hash = hash_start <= offset && read_end <= hash_end;
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R_UNLESS(hash_in_read || read_in_hash, fs::ResultInvalidSha256PartitionHashTarget());
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/* Initialize the generator. */
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generator.Initialize();
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if (hash_in_read) {
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/* Easy case: hash region is contained within the bounds. */
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R_TRY(this->parent->base_storage->Read(entry_start + offset, dst, read_size));
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generator.Update(static_cast<u8 *>(dst) + hash_start - offset, this->partition_entry->hash_target_size);
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} else /* if (read_in_hash) */ {
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/* We're reading a portion of what's hashed. */
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s64 remaining_hash_size = this->partition_entry->hash_target_size;
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s64 hash_offset = entry_start + hash_start;
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s64 remaining_size = read_size;
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s64 copy_offset = 0;
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while (remaining_hash_size > 0) {
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/* Read some portion of data into the buffer. */
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constexpr size_t HashBufferSize = 0x200;
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char hash_buffer[HashBufferSize];
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size_t cur_size = static_cast<size_t>(std::min(static_cast<s64>(HashBufferSize), remaining_hash_size));
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R_TRY(this->parent->base_storage->Read(hash_offset, hash_buffer, cur_size));
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/* Update the hash. */
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generator.Update(hash_buffer, cur_size);
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/* If we need to copy, do so. */
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if (read_offset <= (hash_offset + static_cast<s64>(cur_size)) && remaining_size > 0) {
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const s64 hash_buffer_offset = std::max<s64>(read_offset - hash_offset, 0);
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const size_t copy_size = static_cast<size_t>(std::min<s64>(cur_size - hash_buffer_offset, remaining_size));
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std::memcpy(static_cast<u8 *>(dst) + copy_offset, hash_buffer + hash_buffer_offset, copy_size);
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remaining_size -= copy_size;
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copy_offset += copy_size;
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}
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/* Update offsets. */
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remaining_hash_size -= cur_size;
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hash_offset += cur_size;
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}
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}
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/* Get the hash. */
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generator.GetHash(hash, sizeof(hash));
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/* Validate the hash. */
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auto hash_guard = SCOPE_GUARD { std::memset(dst, 0, read_size); };
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R_UNLESS(crypto::IsSameBytes(this->partition_entry->hash, hash, sizeof(hash)), fs::ResultSha256PartitionHashVerificationFailed());
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/* We successfully completed our read. */
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hash_guard.Cancel();
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}
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/* Set output size. */
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*out = read_size;
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return ResultSuccess();
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}
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template <typename MetaType>
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class PartitionFileSystemCore<MetaType>::PartitionDirectory : public fs::fsa::IDirectory, public fs::impl::Newable {
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private:
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u32 cur_index;
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const PartitionFileSystemCore<MetaType> *parent;
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const fs::OpenDirectoryMode mode;
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public:
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PartitionDirectory(PartitionFileSystemCore<MetaType> *parent, fs::OpenDirectoryMode mode) : cur_index(0), parent(parent), mode(mode) { /* ... */ }
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public:
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virtual Result DoRead(s64 *out_count, fs::DirectoryEntry *out_entries, s64 max_entries) override final {
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/* There are no subdirectories. */
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if ((this->mode & fs::OpenDirectoryMode_File) == 0) {
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*out_count = 0;
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return ResultSuccess();
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}
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/* Calculate number of entries. */
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const s64 entry_count = std::min(max_entries, static_cast<s64>(this->parent->meta_data->GetEntryCount() - this->cur_index));
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/* Populate output directory entries. */
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for (auto i = 0; i < entry_count; i++, this->cur_index++) {
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fs::DirectoryEntry &dir_entry = out_entries[i];
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/* Setup the output directory entry. */
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dir_entry.type = fs::DirectoryEntryType_File;
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dir_entry.file_size = this->parent->meta_data->GetEntry(this->cur_index)->size;
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std::strncpy(dir_entry.name, this->parent->meta_data->GetEntryName(this->cur_index), sizeof(dir_entry.name) - 1);
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dir_entry.name[sizeof(dir_entry.name) - 1] = fs::StringTraits::NullTerminator;
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}
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*out_count = entry_count;
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return ResultSuccess();
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}
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virtual Result DoGetEntryCount(s64 *out) override final {
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/* Output the parent meta data entry count for files, otherwise 0. */
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if (this->mode & fs::OpenDirectoryMode_File) {
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*out = this->parent->meta_data->GetEntryCount();
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} else {
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*out = 0;
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}
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return ResultSuccess();
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}
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virtual sf::cmif::DomainObjectId GetDomainObjectId() const override {
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/* TODO: How should this be handled? */
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return sf::cmif::InvalidDomainObjectId;
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}
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};
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template <typename MetaType>
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PartitionFileSystemCore<MetaType>::PartitionFileSystemCore() : initialized(false) {
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/* ... */
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}
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template <typename MetaType>
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PartitionFileSystemCore<MetaType>::~PartitionFileSystemCore() {
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/* ... */
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::Initialize(fs::IStorage *base_storage, MemoryResource *allocator) {
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/* Validate preconditions. */
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R_UNLESS(!this->initialized, fs::ResultPreconditionViolation());
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/* Allocate meta data. */
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this->unique_meta_data = std::make_unique<MetaType>();
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R_UNLESS(this->unique_meta_data != nullptr, fs::ResultAllocationFailureInPartitionFileSystemA());
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/* Initialize meta data. */
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R_TRY(this->unique_meta_data->Initialize(base_storage, allocator));
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/* Initialize members. */
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this->meta_data = this->unique_meta_data.get();
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this->base_storage = base_storage;
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this->meta_data_size = this->meta_data->GetMetaDataSize();
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this->initialized = true;
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::Initialize(std::unique_ptr<MetaType> &&meta_data, std::shared_ptr<fs::IStorage> base_storage) {
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this->unique_meta_data = std::move(meta_data);
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return this->Initialize(this->unique_meta_data.get(), base_storage);
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::Initialize(MetaType *meta_data, std::shared_ptr<fs::IStorage> base_storage) {
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/* Validate preconditions. */
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R_UNLESS(!this->initialized, fs::ResultPreconditionViolation());
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/* Initialize members. */
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this->shared_storage = std::move(base_storage);
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this->base_storage = this->shared_storage.get();
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this->meta_data = meta_data;
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this->meta_data_size = this->meta_data->GetMetaDataSize();
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this->initialized = true;
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::Initialize(fs::IStorage *base_storage) {
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return this->Initialize(base_storage, std::addressof(g_partition_filesystem_default_allocator));
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::Initialize(std::shared_ptr<fs::IStorage> base_storage) {
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this->shared_storage = std::move(base_storage);
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return this->Initialize(this->shared_storage.get());
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::Initialize(std::shared_ptr<fs::IStorage> base_storage, MemoryResource *allocator) {
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this->shared_storage = std::move(base_storage);
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return this->Initialize(this->shared_storage.get(), allocator);
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::GetFileBaseOffset(s64 *out_offset, const char *path) {
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/* Validate preconditions. */
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R_UNLESS(this->initialized, fs::ResultPreconditionViolation());
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/* Obtain and validate the entry index. */
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const s32 entry_index = this->meta_data->GetEntryIndex(path + 1);
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R_UNLESS(entry_index >= 0, fs::ResultPathNotFound());
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/* Output offset. */
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*out_offset = this->meta_data_size + this->meta_data->GetEntry(entry_index)->offset;
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoGetEntryType(fs::DirectoryEntryType *out, const char *path) {
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/* Validate preconditions. */
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R_UNLESS(this->initialized, fs::ResultPreconditionViolation());
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R_UNLESS(fs::PathNormalizer::IsSeparator(path[0]), fs::ResultInvalidPathFormat());
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/* Check if the path is for a directory. */
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if (std::strncmp(path, fs::PathNormalizer::RootPath, sizeof(fs::PathNormalizer::RootPath)) == 0) {
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*out = fs::DirectoryEntryType_Directory;
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return ResultSuccess();
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}
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/* Ensure that path is for a file. */
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R_UNLESS(this->meta_data->GetEntryIndex(path + 1) >= 0, fs::ResultPathNotFound());
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*out = fs::DirectoryEntryType_File;
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoOpenFile(std::unique_ptr<fs::fsa::IFile> *out_file, const char *path, fs::OpenMode mode) {
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/* Validate preconditions. */
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R_UNLESS(this->initialized, fs::ResultPreconditionViolation());
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/* Obtain and validate the entry index. */
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const s32 entry_index = this->meta_data->GetEntryIndex(path + 1);
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R_UNLESS(entry_index >= 0, fs::ResultPathNotFound());
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/* Create and output the file directory. */
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std::unique_ptr file = std::make_unique<PartitionFile>(this, this->meta_data->GetEntry(entry_index), mode);
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R_UNLESS(file != nullptr, fs::ResultAllocationFailureInPartitionFileSystemB());
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*out_file = std::move(file);
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoOpenDirectory(std::unique_ptr<fs::fsa::IDirectory> *out_dir, const char *path, fs::OpenDirectoryMode mode) {
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/* Validate preconditions. */
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R_UNLESS(this->initialized, fs::ResultPreconditionViolation());
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R_UNLESS(std::strncmp(path, fs::PathNormalizer::RootPath, sizeof(fs::PathNormalizer::RootPath)) == 0, fs::ResultPathNotFound());
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/* Create and output the partition directory. */
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std::unique_ptr directory = std::make_unique<PartitionDirectory>(this, mode);
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R_UNLESS(directory != nullptr, fs::ResultAllocationFailureInPartitionFileSystemC());
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*out_dir = std::move(directory);
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoCommit() {
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return ResultSuccess();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoCleanDirectoryRecursively(const char *path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoCreateDirectory(const char *path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoCreateFile(const char *path, s64 size, int option) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoDeleteDirectory(const char *path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoDeleteDirectoryRecursively(const char *path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoDeleteFile(const char *path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoRenameDirectory(const char *old_path, const char *new_path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoRenameFile(const char *old_path, const char *new_path) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemA();
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}
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template <typename MetaType>
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Result PartitionFileSystemCore<MetaType>::DoCommitProvisionally(s64 counter) {
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return fs::ResultUnsupportedOperationInPartitionFileSystemB();
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}
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template class PartitionFileSystemCore<PartitionFileSystemMeta>;
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template class PartitionFileSystemCore<Sha256PartitionFileSystemMeta>;
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}
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