fs: implement FileHandleStorage (#857)

* fs: implement FileHandleStorage

* fs: merge FileHandleStorage into file_storage TU

Co-authored-by: Michael Scire <SciresM@gmail.com>

libraries/libstratosphere/include/stratosphere/fs/fs_file_storage.hpp

@@ -14,13 +14,14 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #pragma once
-#include "fs_common.hpp"
-#include "fs_istorage.hpp"
-#include "fsa/fs_ifile.hpp"
+#include <stratosphere/fs/fs_common.hpp>
+#include <stratosphere/fs/fs_istorage.hpp>
+#include <stratosphere/fs/fsa/fs_ifile.hpp>
+#include <stratosphere/fs/impl/fs_newable.hpp>
 
 namespace ams::fs {
 
-    class FileStorage : public IStorage {
+    class FileStorage : public IStorage, public impl::Newable {
         private:
             static constexpr s64 InvalidSize = -1;
         private:
@@ -53,4 +54,32 @@ namespace ams::fs {
             virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override;
     };
 
+    class FileHandleStorage : public IStorage, public impl::Newable {
+        private:
+            static constexpr s64 InvalidSize = -1;
+        private:
+            FileHandle handle;
+            bool close_file;
+            s64 size;
+            os::Mutex mutex;
+        public:
+            constexpr explicit FileHandleStorage(FileHandle handle, bool close_file) : handle(handle), close_file(close_file), size(InvalidSize), mutex() { /* ... */ }
+            constexpr explicit FileHandleStorage(FileHandle handle) : FileHandleStorage(handle, false) { /* ... */ }
+
+            virtual ~FileHandleStorage() override {
+                if (this->close_file) {
+                    CloseFile(this->handle);
+                }
+             }
+        protected:
+            Result UpdateSize();
+        public:
+            virtual Result Read(s64 offset, void *buffer, size_t size) override;
+            virtual Result Write(s64 offset, const void *buffer, size_t size) override;
+            virtual Result Flush() override;
+            virtual Result GetSize(s64 *out_size) override;
+            virtual Result SetSize(s64 size) override;
+            virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override;
+    };
+
 }

libraries/libstratosphere/source/fs/fs_file_storage.cpp

@@ -90,4 +90,75 @@ namespace ams::fs {
         }
     }
 
+    Result FileHandleStorage::UpdateSize() {
+        R_SUCCEED_IF(this->size != InvalidSize);
+        return GetFileSize(std::addressof(this->size), this->handle);
+    }
+
+    Result FileHandleStorage::Read(s64 offset, void *buffer, size_t size) {
+        /* Lock the mutex. */
+        std::scoped_lock lk(this->mutex);
+
+        /* Immediately succeed if there's nothing to read. */
+        R_SUCCEED_IF(size == 0);
+
+        /* Validate buffer. */
+        R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
+
+        /* Ensure our size is valid. */
+        R_TRY(this->UpdateSize());
+
+        /* Ensure our access is valid. */
+        R_UNLESS(IStorage::IsRangeValid(offset, size, this->size), fs::ResultOutOfRange());
+
+        return ReadFile(this->handle, offset, buffer, size, fs::ReadOption());
+    }
+
+    Result FileHandleStorage::Write(s64 offset, const void *buffer, size_t size) {
+        /* Lock the mutex. */
+        std::scoped_lock lk(this->mutex);
+
+        /* Immediately succeed if there's nothing to write. */
+        R_SUCCEED_IF(size == 0);
+
+        /* Validate buffer. */
+        R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
+
+        /* Ensure our size is valid. */
+        R_TRY(this->UpdateSize());
+
+        /* Ensure our access is valid. */
+        R_UNLESS(IStorage::IsRangeValid(offset, size, this->size), fs::ResultOutOfRange());
+
+        return WriteFile(this->handle, offset, buffer, size, fs::WriteOption());
+    }
+
+    Result FileHandleStorage::Flush() {
+        return FlushFile(this->handle);
+    }
+
+    Result FileHandleStorage::GetSize(s64 *out_size) {
+        R_TRY(this->UpdateSize());
+        *out_size = this->size;
+        return ResultSuccess();
+    }
+
+    Result FileHandleStorage::SetSize(s64 size) {
+        this->size = InvalidSize;
+        return SetFileSize(this->handle, size);
+    }
+
+    Result FileHandleStorage::OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) {
+        switch (op_id) {
+            case OperationId::QueryRange:
+                /* Validate buffer and size. */
+                R_UNLESS(dst != nullptr,                     fs::ResultNullptrArgument());
+                R_UNLESS(dst_size == sizeof(QueryRangeInfo), fs::ResultInvalidSize());
+
+                return QueryRange(static_cast<QueryRangeInfo *>(dst), this->handle, offset, size);
+            default:
+                return fs::ResultUnsupportedOperationInFileStorageB();
+        }
+    }
+
 }

libraries/libvapours/include/vapours/results/fs_results.hpp

@@ -254,6 +254,7 @@ namespace ams::fs {
                 R_DEFINE_ERROR_RESULT(UnsupportedOperationInMemoryStorageA,                 6304);
                 R_DEFINE_ERROR_RESULT(UnsupportedOperationInMemoryStorageB,                 6305);
                 R_DEFINE_ERROR_RESULT(UnsupportedOperationInFileStorageA,                   6306);
+                R_DEFINE_ERROR_RESULT(UnsupportedOperationInFileStorageB,                   6307);
                 R_DEFINE_ERROR_RESULT(UnsupportedOperationInFileServiceObjectAdapterA,      6362);
                 R_DEFINE_ERROR_RESULT(UnsupportedOperationInRomFsFileSystemA,               6364);
                 R_DEFINE_ERROR_RESULT(UnsupportedOperationInRomFsFileSystemB,               6365);