Android Save Fix (#1270)

* Android Save Fix

* I don't think that should be a variable

* Clean up code

Author: hiimjasmine00

loader/src/hooks/AndroidSaveFix.cpp

@@ -0,0 +1,35 @@
+#include <Geode/platform/cplatform.h>
+
+#ifdef GEODE_IS_ANDROID
+#include <Geode/loader/Mod.hpp>
+
+using namespace geode::prelude;
+
+void* g_decodeAddress = nullptr;
+
+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 {
+    // 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 = dlsym(handle, "_ZN7cocos2d13_base64DecodeEPKhjPhPjb");
+    auto decodeAddress = dlsym(handle, "base64Decode");
+
+    if (g_decodeAddress && decodeAddress) (void)Mod::get()->hook(decodeAddress, &base64DecodeHook, "base64Decode");
+}
+#endif