From 6c48edf51dfbb26a9f0dabaceff28c13964439ca Mon Sep 17 00:00:00 2001
From: meepingsnesroms <guicrith@gmail.com>
Date: Sat, 4 Aug 2018 18:30:08 -0700
Subject: [PATCH] Automatic RAM handling, load on start, save on exit

This will be useful for those who dont use savestates.
Something similar will need to be added for the sd card.
---
 qtBuildSystem/Mu/emuwrapper.cpp | 38 +++++++++++++++++++++++++++++----
 qtBuildSystem/Mu/emuwrapper.h   |  3 ++-
 qtBuildSystem/Mu/mainwindow.cpp |  3 ++-
 3 files changed, 38 insertions(+), 6 deletions(-)

diff --git a/qtBuildSystem/Mu/emuwrapper.cpp b/qtBuildSystem/Mu/emuwrapper.cpp
index 5e543a8..9e6b78c 100644
--- a/qtBuildSystem/Mu/emuwrapper.cpp
+++ b/qtBuildSystem/Mu/emuwrapper.cpp
@@ -101,7 +101,7 @@ void EmuWrapper::emuThreadRun(){
    }
 }
 
-uint32_t EmuWrapper::init(QString romPath, QString bootloaderPath, uint32_t features){
+uint32_t EmuWrapper::init(QString romPath, QString bootloaderPath, QString ramPath, uint32_t features){
    if(!emuRunning && !emuInited){
       //start emu
       uint32_t error;
@@ -112,7 +112,7 @@ uint32_t EmuWrapper::init(QString romPath, QString bootloaderPath, uint32_t feat
       buffer_t romBuff;
       buffer_t bootloaderBuff;
 
-      if(romFile.open(QFile::ReadOnly)){
+      if(romFile.open(QFile::ReadOnly | QFile::ExistingOnly)){
          romData = romFile.readAll();
          romFile.close();
 
@@ -123,8 +123,8 @@ uint32_t EmuWrapper::init(QString romPath, QString bootloaderPath, uint32_t feat
          return EMU_ERROR_INVALID_PARAMETER;
       }
 
-      if(bootloaderPath != "" && bootloaderFile.exists()){
-         if(bootloaderFile.open(QFile::ReadOnly)){
+      if(bootloaderPath != ""){
+         if(bootloaderFile.open(QFile::ReadOnly | QFile::ExistingOnly)){
             bootloaderData = bootloaderFile.readAll();
             bootloaderFile.close();
 
@@ -142,6 +142,25 @@ uint32_t EmuWrapper::init(QString romPath, QString bootloaderPath, uint32_t feat
 
       error = emulatorInit(romBuff, bootloaderBuff, features);
       if(error == EMU_ERROR_NONE){
+         if(ramPath != ""){
+            QFile ramFile(ramPath);
+
+            if(ramFile.exists()){
+               if(ramFile.open(QFile::ReadOnly | QFile::ExistingOnly)){
+                  QByteArray ramData;
+                  buffer_t emuRam = emulatorGetRamBuffer();
+
+                  ramData = ramFile.readAll();
+                  ramFile.close();
+
+                  //only copy in data if its the correct size, the file will be overwritten on exit with the devices RAM either way
+                  //(changing RAM size requires a factory reset for now and always will when going from 128mb back to 16mb)
+                  if(ramData.size() == emuRam.size)
+                     memcpy(emuRam.data, ramData.data(), emuRam.size);
+               }
+            }
+         }
+
          if(features & FEATURE_320x320){
             emuVideoWidth = 320;
             emuVideoHeight = 320 + 120;
@@ -152,6 +171,7 @@ uint32_t EmuWrapper::init(QString romPath, QString bootloaderPath, uint32_t feat
          }
 
          emuInput = palmInput;
+         emuRamFilePath = ramPath;
 
          emuThreadJoin = false;
          emuInited = true;
@@ -175,6 +195,16 @@ void EmuWrapper::exit(){
    if(emuThread.joinable())
       emuThread.join();
    if(emuInited){
+      if(emuRamFilePath != ""){
+         QFile ramFile(emuRamFilePath);
+         buffer_t emuRam = emulatorGetRamBuffer();
+
+         //save out RAM before exit
+         if(ramFile.open(QFile::WriteOnly | QFile::Truncate)){
+            ramFile.write((const char*)emuRam.data, emuRam.size);
+            ramFile.close();
+         }
+      }
       emulatorExit();
       delete[] emuDoubleBuffer;
    }
diff --git a/qtBuildSystem/Mu/emuwrapper.h b/qtBuildSystem/Mu/emuwrapper.h
index adc3fa2..f5f03d6 100644
--- a/qtBuildSystem/Mu/emuwrapper.h
+++ b/qtBuildSystem/Mu/emuwrapper.h
@@ -25,6 +25,7 @@ private:
    uint16_t          emuVideoHeight;
    std::atomic<bool> emuNewFrameReady;
    uint16_t*         emuDoubleBuffer;
+   QString           emuRamFilePath;
 
    void emuThreadRun();
 
@@ -34,7 +35,7 @@ public:
    EmuWrapper();
    ~EmuWrapper();
 
-   uint32_t init(QString romPath, QString bootloaderPath, uint32_t features);
+   uint32_t init(QString romPath, QString bootloaderPath, QString ramPath, uint32_t features);
    void exit();
    void pause();
    void resume();
diff --git a/qtBuildSystem/Mu/mainwindow.cpp b/qtBuildSystem/Mu/mainwindow.cpp
index bbd2f2e..2bbb3b5 100644
--- a/qtBuildSystem/Mu/mainwindow.cpp
+++ b/qtBuildSystem/Mu/mainwindow.cpp
@@ -238,7 +238,8 @@ void MainWindow::on_right_released(){
 //emu control
 void MainWindow::on_ctrlBtn_clicked(){
    if(!emu.isInited()){
-      uint32_t error = emu.init(settings.value("resourceDirectory", "").toString() + "/palmos41-en-m515.rom", settings.value("resourceDirectory", "").toString() + "/bootloader-en-m515.rom", FEATURE_DEBUG);
+      QString systemDirectory = settings.value("resourceDirectory", "").toString();
+      uint32_t error = emu.init(systemDirectory + "/palmos41-en-m515.rom", systemDirectory + "/bootloader-en-m515.rom", systemDirectory + "/userdata-en-m515.ram", FEATURE_DEBUG);
       if(error == EMU_ERROR_NONE){
          ui->calendar->setEnabled(true);
          ui->addressBook->setEnabled(true);