Android Save Fix

loader/src/hooks/AndroidSaveFix.cpp

@@ -0,0 +1,41 @@
+#include <Geode/platform/cplatform.h>
+
+#ifdef GEODE_IS_ANDROID
+#include <loader/LoaderImpl.hpp>
+
+using namespace geode::prelude;
+
+uintptr_t g_decodeAddress = 0;
+
+int base64DecodeHook(uint8_t* input, uint32_t length, uint8_t** output, bool urlSafe) {
+    *output = new uint8_t[(size_t)(length * 3) / 4 + 4];
+
+    uint32_t outLength = 0;
+    int ret = reinterpret_cast<int(*)(uint8_t*, uint32_t, uint8_t*, uint32_t*, bool)>(g_decodeAddress)(input, length, *output, &outLength, urlSafe);
+    if (ret > 0) {
+        delete[] *output;
+        *output = nullptr;
+        outLength = 0;
+    }
+
+    return outLength;
+}
+
+$execute {
+    if (LoaderImpl::get()->isForwardCompatMode()) return;
+
+    // This fixes a crash when using the base64Decode function in cocos2d-x, due to
+    // floating-point precision errors causing the output buffer to be too small.
+    // This issue can cause large save files to crash the game.
+
+    auto handle = dlopen("libcocos2dcpp.so", RTLD_LAZY | RTLD_NOLOAD);
+    g_decodeAddress = reinterpret_cast<uintptr_t>(dlsym(handle, "_ZN7cocos2d13_base64DecodeEPKhjPhPjb"));
+    auto decodeAddress = dlsym(handle, "base64Decode");
+
+    (void) Mod::get()->hook(
+        reinterpret_cast<void*>(decodeAddress),
+        &base64DecodeHook,
+        "base64Decode"
+    );
+}
+#endif