git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

libraries/libstratosphere/include/stratosphere/fs/fsa/fs_ifile.hpp

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2018-2019 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_file.hpp"
+#include "../fs_operate_range.hpp"
+
+namespace ams::fs::fsa {
+
+    class IFile {
+        public:
+            virtual ~IFile() { /* ... */ }
+
+            Result Read(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) {
+                R_UNLESS(out != nullptr, fs::ResultNullptrArgument());
+                if (size == 0) {
+                    *out = 0;
+                    return ResultSuccess();
+                }
+                R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
+                R_UNLESS(offset >= 0, fs::ResultOutOfRange());
+                const s64 signed_size = static_cast<s64>(size);
+                R_UNLESS(signed_size >= 0, fs::ResultOutOfRange());
+                R_UNLESS((std::numeric_limits<s64>::max() - offset) >= signed_size, fs::ResultOutOfRange());
+                return this->ReadImpl(out, offset, buffer, size, option);
+            }
+
+            Result Read(size_t *out, s64 offset, void *buffer, size_t size) {
+                return this->Read(out, offset, buffer, size, ReadOption::None);
+            }
+
+            Result GetSize(s64 *out) {
+                R_UNLESS(out != nullptr, fs::ResultNullptrArgument());
+                return this->GetSizeImpl(out);
+            }
+
+            Result Flush() {
+                return this->FlushImpl();
+            }
+
+            Result Write(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) {
+                if (size == 0) {
+                    if (option.HasFlushFlag()) {
+                        R_TRY(this->Flush());
+                    }
+                    return ResultSuccess();
+                }
+                R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
+                R_UNLESS(offset >= 0, fs::ResultOutOfRange());
+                const s64 signed_size = static_cast<s64>(size);
+                R_UNLESS(signed_size >= 0, fs::ResultOutOfRange());
+                R_UNLESS((std::numeric_limits<s64>::max() - offset) >= signed_size, fs::ResultOutOfRange());
+                return this->WriteImpl(offset, buffer, size, option);
+            }
+
+            Result SetSize(s64 size) {
+                R_UNLESS(size >= 0, fs::ResultOutOfRange());
+                return this->SetSizeImpl(size);
+            }
+
+            Result OperateRange(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) {
+                return this->OperateRangeImpl(dst, dst_size, op_id, offset, size, src, src_size);
+            }
+
+            Result OperateRange(fs::OperationId op_id, s64 offset, s64 size) {
+                return this->OperateRangeImpl(nullptr, 0, op_id, offset, size, nullptr, 0);
+            }
+        public:
+            /* TODO: This is a hack to allow the mitm API to work. Find a better way? */
+            virtual sf::cmif::DomainObjectId GetDomainObjectId() const = 0;
+        protected:
+            /* ...? */
+        private:
+            virtual Result ReadImpl(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) = 0;
+            virtual Result GetSizeImpl(s64 *out) = 0;
+            virtual Result FlushImpl() = 0;
+            virtual Result WriteImpl(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) = 0;
+            virtual Result SetSizeImpl(s64 size) = 0;
+            virtual Result OperateRangeImpl(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) = 0;
+    };
+
+}