fix Windows/MSVC build portability

CMakeLists.txt

@@ -13,9 +13,17 @@ file(GLOB_RECURSE LIBS "include/*.hpp" "include/*.h" "include/*.cpp" "include/*.
 include_directories(mc_cpp ${CMAKE_CURRENT_SOURCE_DIR}/include)
 
 find_package(Boost REQUIRED COMPONENTS iostreams)
-link_libraries(z crypto)
 if(WIN32)
-    link_libraries(ws2_32)
+    # Bare `z`/`crypto` are Unix `-l` names that don't resolve on Windows: the
+    # crypto import lib is libcrypto.lib (not crypto.lib), and the provider's lib
+    # dir generally isn't on the linker's search path (so even a correctly-named
+    # zlib import lib wouldn't be found by bare name). find_package imported
+    # targets supply the resolved paths and correct names.
+    find_package(ZLIB REQUIRED)
+    find_package(OpenSSL REQUIRED)
+    link_libraries(ZLIB::ZLIB OpenSSL::Crypto ws2_32)
+else()
+    link_libraries(z crypto)
 endif()
 
 include(FetchContent)

include/mc_cpp/crypto/rsa.cpp

@@ -1,6 +1,7 @@
 #include <mc_cpp/crypto/rsa.hpp>
 #include <openssl/pem.h>
 #include <iostream>
+#include <cstdio>
 
 namespace mc {
     auto generateRSAKeyPair(const size_t bits) -> EVP_PKEY* {
@@ -27,7 +28,13 @@ namespace mc {
     }
 
     auto loadRSAPrivateKey(const std::filesystem::path &filepath) -> EVP_PKEY* {
+#ifdef _WIN32
+        // path::c_str() is const wchar_t* on Windows; _wfopen keeps Unicode paths intact
+        // (a narrow fopen would go through the lossy ANSI code page).
+        auto *fp = _wfopen(filepath.c_str(), L"rb");
+#else
         auto *fp = fopen(filepath.c_str(), "rb");
+#endif
         if (!fp)
             return nullptr;
 

include/mc_cpp/registry/registries/biomes.cpp

@@ -33,7 +33,7 @@ namespace mc {
             // biome overrides only store y = 0 as they don't depend on y
                 return isGrass ? biomeGrassColors[biomeType] : biomeFoliageColors[biomeType];
 
-        const auto y = std::clamp(yLevel - SEA_LEVEL, 0, UINT8_MAX);
+        const auto y = std::clamp<int>(yLevel - SEA_LEVEL, 0, UINT8_MAX);
         return isGrass ? biomeGrassColors  [biomeType + UINT8_MAX * y]
                        : biomeFoliageColors[biomeType + UINT8_MAX * y];
     }