corda/src/embedded-loader.cpp

/* Copyright (c) 2008-2012, Avian Contributors

   Permission to use, copy, modify, and/or distribute this software
   for any purpose with or without fee is hereby granted, provided
   that the above copyright notice and this permission notice appear
   in all copies.

   There is NO WARRANTY for this software.  See license.txt for
   details. */

#include <windows.h>
#include <tchar.h>
#include <stdint.h>

#include "embed.h"
#include "jni.h"


#if (defined __MINGW32__) || (defined _MSC_VER)
#  define EXPORT __declspec(dllexport)
#else
#  define EXPORT __attribute__ ((visibility("default"))) \
  __attribute__ ((used))
#endif

extern "C" {

  EXPORT const uint8_t*
  bootJar(unsigned* size)
  {
    if(HRSRC hResInfo = FindResource(NULL, _T(RESID_BOOT_JAR), RT_RCDATA))
    {
      if(HGLOBAL hRes = LoadResource(NULL, hResInfo))
      {
        *size = SizeofResource(NULL, hResInfo);
        return (const uint8_t*)LockResource(hRes);
      }
    }

	fprintf(stderr, "boot.jar resource not found\n");

    *size = 0;
    return NULL;
  }
} // extern "C"

static bool getMainClass(char* pName, int maxLen)
{
  if(0 == LoadString(NULL, RESID_MAIN_CLASS, pName, maxLen))
  {
    fprintf(stderr, "Main class not specified\n");
    strcpy(pName, "Main");
  }
}

int
main(int ac, const char** av)
{
  JavaVMInitArgs vmArgs;
  vmArgs.version = JNI_VERSION_1_2;
  vmArgs.nOptions = 1;
  vmArgs.ignoreUnrecognized = JNI_TRUE;

  JavaVMOption options[vmArgs.nOptions];
  vmArgs.options = options;

  options[0].optionString = const_cast<char*>("-Xbootclasspath:[bootJar]");

  JavaVM* vm;
  void* env;
  JNI_CreateJavaVM(&vm, &env, &vmArgs);
  JNIEnv* e = static_cast<JNIEnv*>(env);

  char mainClass[256];
  getMainClass(mainClass, sizeof(mainClass));

  jclass c = e->FindClass(mainClass);
  if (not e->ExceptionCheck()) {
	jmethodID m = e->GetStaticMethodID(c, "main", "([Ljava/lang/String;)V");
	if (not e->ExceptionCheck()) {
	  jclass stringClass = e->FindClass("java/lang/String");
	  if (not e->ExceptionCheck()) {
		jobjectArray a = e->NewObjectArray(ac-1, stringClass, 0);
		if (not e->ExceptionCheck()) {
		  for (int i = 1; i < ac; ++i) {
			e->SetObjectArrayElement(a, i-1, e->NewStringUTF(av[i]));
		  }
		  
		  e->CallStaticVoidMethod(c, m, a);
		} else fprintf(stderr, "Couldn't create array\n");
	  } else fprintf(stderr, "java.lang.String not found\n");
	} else fprintf(stderr, "main method not found\n");
  } else fprintf(stderr, "Main class not found\n");

  int exitCode = 0;
  if(e->ExceptionCheck()) {
    exitCode = -1;
    e->ExceptionDescribe();
    e->ExceptionClear();
  }

  vm->DestroyJavaVM();

  return exitCode;
}