From 2d7d52542df9b925fb0d7786e828421cd731b82b Mon Sep 17 00:00:00 2001
From: bigfoot547 <bigfoot@figboot.dev>
Date: Sat, 6 Jan 2024 06:07:57 -0600
Subject: launches the game

---
 src/jniwrap.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/jniwrap.c

(limited to 'src/jniwrap.c')

diff --git a/src/jniwrap.c b/src/jniwrap.c
new file mode 100644
index 0000000..ac796b1
--- /dev/null
+++ b/src/jniwrap.c
@@ -0,0 +1,92 @@
+#define L2_JNI__NO_DEFINE_PROXIES
+
+#include "config.h"
+#include "jniwrap.h"
+#include "macros.h"
+#include "command.h"
+
+#include <stddef.h>
+#include <dlfcn.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+/* this isn't even a little bit thread safe but it is what it is */
+
+jint JNICALL l2_JNI__GetDefaultJavaVMInitArgs_load(void *args);
+jint JNICALL l2_JNI__CreateJavaVM_load(JavaVM **pvm, void **penv, void *args);
+
+l2_JNI__GetDefaultJavaVMInitArgs_t *l2_JNI__GetDefaultJavaVMInitArgs_call = &l2_JNI__GetDefaultJavaVMInitArgs_load;
+l2_JNI__CreateJavaVM_t *l2_JNI__CreateJavaVM_call = &l2_JNI__CreateJavaVM_load;
+
+void *volatile l2_JNI__jnimod = NULL;
+
+int l2_jni__try_load(const char *path)
+{
+  struct stat st;
+  if (stat(path, &st) < 0) {
+    CMD_ERROR("Could not stat %s: %s", path, strerror(errno));
+    return -1;
+  }
+
+  void *thelib = dlopen(path, RTLD_LAZY);
+  if (!thelib) {
+    CMD_ERROR("Failed to load JVM library %s: %s", path, dlerror());
+    return -1;
+  }
+
+  l2_JNI__jnimod = thelib;
+  return 0;
+}
+
+int l2_jni_init(const char *modpath)
+{
+  if (l2_JNI__jnimod) return 0;
+
+  if (l2_jni__try_load(modpath) < 0) {
+    CMD_ERROR0("Could not load JVM library.");
+    return -1;
+  }
+
+  return 0;
+}
+
+typedef void (l2_jni__fsym_unspec)(void);
+
+l2_jni__fsym_unspec *l2_jni__try_load_sym(const char *sym)
+{
+  void *themod = l2_JNI__jnimod;
+  if (!themod) {
+    CMD_MSG("bug", "JNI function %s called before l2_jni_init!", sym);
+    abort();
+  }
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+  l2_jni__fsym_unspec *thesym = dlsym(themod, sym);
+#pragma GCC diagnostic pop
+
+  if (!thesym) {
+    CMD_ERROR("Could not load JNI symbol %s: %s", sym, dlerror());
+    abort();
+  }
+
+  return thesym;
+}
+
+jint JNICALL l2_JNI__GetDefaultJavaVMInitArgs_load(void *args)
+{
+  l2_JNI__GetDefaultJavaVMInitArgs_t *thesym = (l2_JNI__GetDefaultJavaVMInitArgs_t *)l2_jni__try_load_sym("JNI_GetDefaultJavaVMInitArgs");
+  l2_JNI__GetDefaultJavaVMInitArgs_call = thesym;
+
+  return (*thesym)(args);
+}
+
+jint JNICALL l2_JNI__CreateJavaVM_load(JavaVM **pvm, void **penv, void *args)
+{
+  l2_JNI__CreateJavaVM_t *thesym = (l2_JNI__CreateJavaVM_t *)l2_jni__try_load_sym("JNI_CreateJavaVM");
+  l2_JNI__CreateJavaVM_call = thesym;
+
+  return (*thesym)(pvm, penv, args);
+}
-- 
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