Introduce KTLS based http downoader API stub

app/src/main/cpp/CMakeLists.txt

@@ -63,5 +63,5 @@ FetchContent_MakeAvailable(libarchive)
 include_directories(${libarchive_SOURCE_DIR}/libarchive)
 
 # Build and link our app's native lib
-add_library(${PROJECT_NAME} SHARED archive.c gifutils.c natsort/strnatcmp.c)
+add_library(${PROJECT_NAME} SHARED archive.c gifutils.c http_downloader.c natsort/strnatcmp.c)
 target_link_libraries(${PROJECT_NAME} archive_static log)

app/src/main/cpp/http_downloader.c

@@ -0,0 +1,13 @@
+#include <jni.h>
+
+// This JNI function makes https call and save responseBody directly to filesystem to avoid copy on JVM heap
+JNIEXPORT jlong JNICALL
+Java_com_hippo_ehviewer_spider_SpiderDenKt_makeHttpsCallAndSaveToFd(JNIEnv *env, jclass clazz,jstring url, jboolean do_sni, jint fd) {
+    // TODO: implement makeHttpsCallAndSaveToFd()
+}
+
+// Is KTLS supported? if not, we maybe use [TLSChannel]https://github.com/marianobarrios/tls-channel and do DirectByteBuffer IO
+JNIEXPORT jboolean JNICALL
+Java_com_hippo_ehviewer_spider_SpiderDenKt_kernelSupportKTLS(JNIEnv *env, jclass clazz) {
+    // TODO: implement kernelSupportKTLS()
+}