ams_mitm: implement bpc:mitm

stratosphere/ams_mitm/source/amsmitm_fs_utils.cpp

@@ -0,0 +1,72 @@
+/*
+ * 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/>.
+ */
+#include <stratosphere.hpp>
+#include "amsmitm_initialization.hpp"
+#include "amsmitm_fs_utils.hpp"
+
+namespace ams::mitm::fs {
+
+    namespace {
+
+        /* Globals. */
+        FsFileSystem g_sd_filesystem;
+
+        /* Helpers. */
+        Result EnsureSdInitialized() {
+            R_UNLESS(mitm::IsInitialized(), ams::fs::ResultSdCardNotPresent());
+            return ResultSuccess();
+        }
+
+        void FormatAtmosphereSdPath(char *dst_path, size_t dst_path_size, const char *src_path) {
+            if (src_path[0] == '/') {
+                std::snprintf(dst_path, dst_path_size, "/atmosphere%s", src_path);
+            } else {
+                std::snprintf(dst_path, dst_path_size, "/atmosphere/%s", src_path);
+            }
+        }
+
+        void FormatAtmosphereSdPath(char *dst_path, size_t dst_path_size, ncm::ProgramId program_id, const char *src_path) {
+            if (src_path[0] == '/') {
+                std::snprintf(dst_path, dst_path_size, "/atmosphere/contents/%016lx%s", static_cast<u64>(program_id), src_path);
+            } else {
+                std::snprintf(dst_path, dst_path_size, "/atmosphere/contents/%016lx/%s", static_cast<u64>(program_id), src_path);
+            }
+        }
+
+    }
+
+    void OpenGlobalSdCardFileSystem() {
+        R_ASSERT(fsOpenSdCardFileSystem(&g_sd_filesystem));
+    }
+
+    Result OpenSdFile(FsFile *out, const char *path, u32 mode) {
+        R_TRY(EnsureSdInitialized());
+        return fsFsOpenFile(&g_sd_filesystem, path, mode, out);
+    }
+
+    Result OpenAtmosphereSdFile(FsFile *out, const char *path, u32 mode) {
+        char fixed_path[FS_MAX_PATH];
+        FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), path);
+        return OpenSdFile(out, fixed_path, mode);
+    }
+
+    Result OpenAtmosphereSdFile(FsFile *out, ncm::ProgramId program_id, const char *path, u32 mode) {
+        char fixed_path[FS_MAX_PATH];
+        FormatAtmosphereSdPath(fixed_path, sizeof(fixed_path), program_id, path);
+        return OpenSdFile(out, fixed_path, mode);
+    }
+
+}