1 files changed, 39 insertions, 0 deletions

diff --git a/src/core/hle/service/bcat/bcat_util.h b/src/core/hle/service/bcat/bcat_util.h
new file mode 100644
index 000000000..6bf2657ee
--- /dev/null
+++ b/src/core/hle/service/bcat/bcat_util.h
@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <array>
+#include <cctype>
+#include <mbedtls/md5.h>
+
+#include "core/hle/service/bcat/bcat_result.h"
+#include "core/hle/service/bcat/bcat_types.h"
+
+namespace Service::BCAT {
+
+// For a name to be valid it must be non-empty, must have a null terminating character as the final
+// char, can only contain numbers, letters, underscores and a hyphen if directory and a period if
+// file.
+constexpr Result VerifyNameValidInternal(std::array<char, 0x20> name, char match_char) {
+    const auto null_chars = std::count(name.begin(), name.end(), 0);
+    const auto bad_chars = std::count_if(name.begin(), name.end(), [match_char](char c) {
+        return !std::isalnum(static_cast<u8>(c)) && c != '_' && c != match_char && c != '\0';
+    });
+    if (null_chars == 0x20 || null_chars == 0 || bad_chars != 0 || name[0x1F] != '\0') {
+        LOG_ERROR(Service_BCAT, "Name passed was invalid!");
+        return ResultInvalidArgument;
+    }
+
+    return ResultSuccess;
+}
+
+constexpr Result VerifyNameValidDir(DirectoryName name) {
+    return VerifyNameValidInternal(name, '-');
+}
+
+constexpr Result VerifyNameValidFile(FileName name) {
+    return VerifyNameValidInternal(name, '.');
+}
+
+} // namespace Service::BCAT