fs: implement FileHandleStorage

libraries/libstratosphere/include/stratosphere/fs.hpp

@@ -28,6 +28,7 @@
 #include <stratosphere/fs/fs_memory_storage.hpp>
 #include <stratosphere/fs/fs_remote_storage.hpp>
 #include <stratosphere/fs/fs_file_storage.hpp>
+#include <stratosphere/fs/fs_file_handle_storage.hpp>
 #include <stratosphere/fs/fs_query_range.hpp>
 #include <stratosphere/fs/impl/fs_common_mount_name.hpp>
 #include <stratosphere/fs/fs_mount.hpp>

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

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2018-2020 Adubbz, 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 "fs_common.hpp"
+#include "fs_istorage.hpp"
+
+namespace ams::fs {
+
+    class FileHandleStorage : public IStorage {
+        private:
+            static constexpr s64 InvalidSize = -1;
+        private:
+            FileHandle handle;
+            bool close_file;
+            s64 size;
+            os::Mutex mutex;
+        public:
+            FileHandleStorage(FileHandle handle) : FileHandleStorage(handle, false) { /* ... */ }
+
+            FileHandleStorage(FileHandle handle, bool close_file) : handle(handle), close_file(close_file), size(InvalidSize) {
+                /* ... */
+            }
+
+            virtual ~FileHandleStorage() { 
+                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_handle_storage.cpp

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2018-2020 Adubbz, 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/>.
+ */
+#include <stratosphere.hpp>
+
+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);