diff --git a/Calculator/main.cpp b/Calculator/main.cpp
index 820677f..8482f4a 100644
--- a/Calculator/main.cpp
+++ b/Calculator/main.cpp
@@ -31,11 +31,13 @@ int main(int argc, char *argv[])
         //TariffCalculatorHandle handle = NewTariffCalculator();
         //DeleteTariffCalculator(handle);
 
-        if (InitGitLibrary() > 0) {
-            qCritical() << CloneRepository("https://git.mimbach49.de/GerhardHoffmann/customer_999.git", "C:\\tmp\\customer_999");
-            qCritical() << CheckoutLocalBranch("C:\\tmp\\customer_999", "master");
-            ShutdownGitLibrary();
-        }
+        //if (InitGitLibrary() > 0) {
+        //    qCritical() << CloneRepository("https://git.mimbach49.de/GerhardHoffmann/customer_999.git", "C:\\tmp\\customer_999");
+        //    qCritical() << CheckoutLocalBranch("C:\\tmp\\customer_999", "master");
+        //    ShutdownGitLibrary();
+       // }
+
+    qCritical() << GetFileMenuSize("customer_999");
 #else
     QLibrary library("C:\\build-ATBTariffCalculator-Desktop_Qt_6_5_0_MinGW_64_bit-Release\\CalculatorCInterface\\release\\CalculatorCInterface.dll");
     if (library.load()) {
diff --git a/CalculatorCInterface/CalculatorCInterface.pro b/CalculatorCInterface/CalculatorCInterface.pro
index e0a6722..d697ba8 100644
--- a/CalculatorCInterface/CalculatorCInterface.pro
+++ b/CalculatorCInterface/CalculatorCInterface.pro
@@ -28,12 +28,14 @@ CONFIG += c++20 console
 
 SOURCES += \
     calculator_c_interface_lib.cpp \
-    tariff_calculator.cpp
+    tariff_calculator.cpp \
+    local_git_repository.cpp
 
 HEADERS += \
     calculator_c_interface_lib.h \
     calculator_c_interface_lib_global.h \
-    tariff_calculator.h
+    tariff_calculator.h \
+    local_git_repository.h
 
 # Default rules for deployment.
 unix {
diff --git a/CalculatorCInterface/calculator_c_interface_lib.cpp b/CalculatorCInterface/calculator_c_interface_lib.cpp
index 4708e9e..f1b97ef 100644
--- a/CalculatorCInterface/calculator_c_interface_lib.cpp
+++ b/CalculatorCInterface/calculator_c_interface_lib.cpp
@@ -5,12 +5,17 @@
 #include <QMap>
 #include <QString>
 #include <QDir>
+#include <QFile>
+#include <QByteArray>
+#include <QRegularExpression>
+#include <QRegularExpressionMatch>
 #include <mutex>
 
 
 #include <git2.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <algorithm>
 
 static QMap<QString, git_repository *> customerRepoMap;
 static std::mutex m;
@@ -589,7 +594,67 @@ int PushLocalRepository(char const *local_path, char const *branch_name, char co
     return error;
 }
 
+#include <local_git_repository.h>
 
+static QMap<QString, LocalGitRepository *> localGitRepos;
+
+int32_t GetFileMenuSize(char const *localGitRepo) {
+    if (localGitRepos.count(localGitRepo) == 0) {
+        localGitRepos.insert(localGitRepo,
+                             new LocalGitRepository(localGitRepo));
+    }
+    return localGitRepos[localGitRepo]->GetFileMenuSize();
+}
+
+char const *GetFileMenu(const char *localGitRepo) {
+    static char j[] = "{}";
+    char *json = j;
+    int const len = GetFileMenuSize(localGitRepo);
+    if (len > 0) {
+        json = new char [len+1];
+        // fprintf(stderr, "allocate pointer %p\n", json);
+        memset(json, 0x00, len+1);
+        QByteArray const &a = localGitRepos[localGitRepo]->GetFileMenu().constData();
+        if (a.isValidUtf8()) {
+            memcpy(json, a.constData(), std::min(len, (int)a.size()));
+        }
+    }
+    return json;
+}
+
+
+char const *GetFileName(char const *localGitRepo, char const *fileId) {
+    QByteArray const &a = localGitRepos[localGitRepo]->GetFileName(fileId);
+    if (a.isValidUtf8()) {
+        char *c = new char[a.size() + 1];
+        memset(c, 0x00, a.size() + 1);
+        memcpy(c, a.constData(), a.size());
+        return c;
+    }
+    return nullptr;
+}
+
+int32_t GetFileSize(char const *localGitRepo, char const *fileId) {
+    return localGitRepos[localGitRepo]->GetFileSize(fileId);
+}
+
+char const *GetFile(char const *localGitRepo, char const *fileId) {
+    QByteArray const &a = localGitRepos[localGitRepo]->GetFile(fileId);
+    if (a.isValidUtf8()) {
+        char *c = new char[a.size() + 1];
+        memset(c, 0x00, a.size() + 1);
+        memcpy(c, a.constData(), a.size());
+        return c;
+    }
+    return nullptr;
+}
+
+void DeleteMem(char *p) {
+    if (p) {
+        // fprintf(stderr, "delete pointer %p\n", p);
+        delete p;
+    }
+}
 
 #ifdef __cplusplus
 }
diff --git a/CalculatorCInterface/calculator_c_interface_lib.h b/CalculatorCInterface/calculator_c_interface_lib.h
index 5df2734..8a1589c 100644
--- a/CalculatorCInterface/calculator_c_interface_lib.h
+++ b/CalculatorCInterface/calculator_c_interface_lib.h
@@ -1,6 +1,5 @@
 #ifndef CALCULATOR_C_INTERFACE_LIB_H_INCLUDED
 #define CALCULATOR_C_INTERFACE_LIB_H_INCLUDED
-
 #include "calculator_c_interface_lib_global.h"
 #include "tariff_calculator.h"
 
@@ -10,6 +9,16 @@ typedef TariffCalculator *TariffCalculatorHandle;
 extern "C" {
 #endif
 
+void DeleteMem(char *p) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+
+// interface for menu of webpage
+char const *GetFileMenu(char const *localRepo) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int32_t GetFileMenuSize(char const *localRepo) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+char const *GetFileName(char const *localRepo, char const *fileId) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+int32_t GetFileSize(char const *localRepo, char const *fileId) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+char const *GetFile(char const *localRepo, char const *fileId) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+bool SetFile(char const *localRepo, char const *fileId, char const *json) CALCULATOR_C_INTERFACE_LIB_EXPORT;
+
 TariffCalculatorHandle NewTariffCalculator(void) CALCULATOR_C_INTERFACE_LIB_EXPORT;
 void DeleteTariffCalculator(TariffCalculatorHandle handle) CALCULATOR_C_INTERFACE_LIB_EXPORT;