1 files changed, 47 insertions, 2 deletions

diff --git a/src/frontend/qt_sdl/EmuSettingsDialog.cpp b/src/frontend/qt_sdl/EmuSettingsDialog.cpp
index 34cafb5..bce5513 100644
--- a/src/frontend/qt_sdl/EmuSettingsDialog.cpp
+++ b/src/frontend/qt_sdl/EmuSettingsDialog.cpp
@@ -16,9 +16,12 @@
     with melonDS. If not, see http://www.gnu.org/licenses/.
 */
 
+#include <stdio.h>
 #include <QFileDialog>
+#include <QMessageBox>
 
 #include "types.h"
+#include "Platform.h"
 #include "Config.h"
 #include "PlatformConfig.h"
 
@@ -47,8 +50,52 @@ EmuSettingsDialog::~EmuSettingsDialog()
     delete ui;
 }
 
+void EmuSettingsDialog::verifyFirmware()
+{
+    // verify the firmware
+    //
+    // there are dumps of an old hacked firmware floating around on the internet
+    // and those are problematic
+    // the hack predates WFC, and, due to this, any game that alters the WFC
+    // access point data will brick that firmware due to it having critical
+    // data in the same area. it has the same problem on hardware.
+    //
+    // but this should help stop users from reporting that issue over and over
+    // again, when the issue is not from melonDS but from their firmware dump.
+    //
+    // I don't know about all the firmware hacks in existence, but the one I
+    // looked at has 0x180 bytes from the header repeated at 0x3FC80, but
+    // bytes 0x0C-0x14 are different.
+
+    char filename[1024];
+    strncpy(filename, ui->txtFirmwarePath->text().toStdString().c_str(), 1023); filename[1023] = '\0';
+    FILE* f = Platform::OpenLocalFile(filename, "rb");
+    u8 chk1[0x180], chk2[0x180];
+
+    fseek(f, 0, SEEK_SET);
+    fread(chk1, 1, 0x180, f);
+    fseek(f, -0x380, SEEK_END);
+    fread(chk2, 1, 0x180, f);
+
+    memset(&chk1[0x0C], 0, 8);
+    memset(&chk2[0x0C], 0, 8);
+
+    fclose(f);
+
+    if (!memcmp(chk1, chk2, 0x180))
+    {
+        QMessageBox::warning(this,
+                      "Problematic firmware dump",
+                      "You are using an old hacked firmware dump.\n"
+                      "Firmware boot will stop working if you run any game that alters WFC settings.\n\n"
+                      "Note that the issue is not from melonDS, it would also happen on an actual DS.");
+    }
+}
+
 void EmuSettingsDialog::on_EmuSettingsDialog_accepted()
 {
+    verifyFirmware();
+
     strncpy(Config::BIOS9Path, ui->txtBIOS9Path->text().toStdString().c_str(), 1023); Config::BIOS9Path[1023] = '\0';
     strncpy(Config::BIOS7Path, ui->txtBIOS7Path->text().toStdString().c_str(), 1023); Config::BIOS7Path[1023] = '\0';
     strncpy(Config::FirmwarePath, ui->txtFirmwarePath->text().toStdString().c_str(), 1023); Config::FirmwarePath[1023] = '\0';
@@ -95,7 +142,5 @@ void EmuSettingsDialog::on_btnFirmwareBrowse_clicked()
 
     if (file.isEmpty()) return;
 
-    // TODO: check for shitty hacked firmware here?
-
     ui->txtFirmwarePath->setText(file);
 }