Implement NCM

stratosphere/ncm/source/ncm_path_utils.cpp

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2019 Adubbz
+ *
+ * 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 "ncm_path_utils.hpp"
+#include "ncm_utils.hpp"
+
+namespace sts::ncm::path {
+
+    void GetContentMetaPath(char* out, ContentId content_id, MakeContentPathFunc path_func, const char* root_path) {
+        char tmp_path[FS_MAX_PATH-1] = {0};
+        char content_path[FS_MAX_PATH-1] = {0};
+        path_func(content_path, content_id, root_path);
+        const size_t len = strnlen(content_path, FS_MAX_PATH-1);
+        const size_t len_no_extension = len - 4;
+
+        if (len_no_extension > len || len_no_extension >= FS_MAX_PATH-1) {
+            std::abort();
+        }
+
+        strncpy(tmp_path, content_path, len_no_extension);
+        memcpy(out, tmp_path, FS_MAX_PATH-1);
+        const size_t out_len = strnlen(out, FS_MAX_PATH-1);
+
+        if (out_len + 9 >= FS_MAX_PATH-1) {
+            std::abort();
+        }
+
+        strncat(out, ".cnmt.nca", 0x2ff - out_len);
+    }
+
+    void GetContentFileName(char* out, ContentId content_id) {
+        char content_name[sizeof(ContentId)*2+1] = {0};
+        GetStringFromContentId(content_name, content_id);
+        snprintf(out, FS_MAX_PATH-1, "%s%s", content_name, ".nca");
+    }
+
+    void GetPlaceHolderFileName(char* out, PlaceHolderId placeholder_id) {
+        char placeholder_name[sizeof(PlaceHolderId)*2+1] = {0};
+        GetStringFromPlaceHolderId(placeholder_name, placeholder_id);
+        snprintf(out, FS_MAX_PATH-1, "%s%s", placeholder_name, ".nca");
+    }
+
+    bool IsNcaPath(const char* path) {
+        PathView path_view(path);
+
+        if (!path_view.HasSuffix(".nca")) {
+            return false;
+        }
+
+        std::string_view file_name = path_view.GetFileName();
+
+        if (file_name.length() != 0x24) {
+            return false;
+        }
+
+        for (size_t i = 0; i < sizeof(Uuid)*2; i++) {
+            if (!std::isxdigit(file_name.at(i))) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    bool PathView::HasPrefix(std::string_view prefix) const {
+        return this->path.compare(0, prefix.length(), prefix) == 0;
+    }
+
+    bool PathView::HasSuffix(std::string_view suffix) const {
+        return this->path.compare(this->path.length() - suffix.length(), suffix.length(), suffix) == 0;
+    }
+
+    std::string_view PathView::GetFileName() const {
+        return this->path.substr(this->path.find_last_of("/") + 1);
+    }
+
+}