/*
 * MemoryStatus class native methods C implementations
 * Copyright Yoon Kyung Koo, All rights reserved.
 * @author <A HREF="mailto:yoonforh@yahoo.com">Yoon Kyung Koo</A>
 */

#include <windows.h>
#include "MemoryStatus.h"

/*
 * Class:     MemoryStatus
 * Method:    getAvailVirtual
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getAvailVirtual
  (JNIEnv * env, jobject obj)
{
	MEMORYSTATUS memStat;
	GlobalMemoryStatus(&memStat);
	return (jlong) (int) memStat.dwAvailVirtual;
}

/*
 * Class:     MemoryStatus
 * Method:    getTotalVirtual
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getTotalVirtual
  (JNIEnv * env, jobject obj)
{
	MEMORYSTATUS memStat;
	GlobalMemoryStatus(&memStat);
	return (jlong) (int) memStat.dwTotalVirtual;
}

/*
 * Class:     MemoryStatus
 * Method:    getAvailPageFile
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getAvailPageFile
  (JNIEnv *env, jobject obj)
{
	MEMORYSTATUS memStat;
	GlobalMemoryStatus(&memStat);
	return (jlong) (int) memStat.dwAvailPageFile;
}

/*
 * Class:     MemoryStatus
 * Method:    getAvailPhysical
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getAvailPhysical
  (JNIEnv *env, jobject obj)
{
	MEMORYSTATUS memStat;
	GlobalMemoryStatus(&memStat);
	return (jlong) (int) memStat.dwAvailPhys;
}

/*
 * Class:     MemoryStatus
 * Method:    getDiskFreeSpace
 * Signature: (Ljava/lang/String;)J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getDiskFreeSpace
  (JNIEnv * env, jobject obj, jstring string)
{
	int a, b, c, d;
	jchar *chars = (*env)->GetStringUTFChars(env, string, JNI_FALSE /* no copy */);
	GetDiskFreeSpace((char *)chars, &a, &b, &c, &d);
	printf("disk free chars : %s\n", chars);
	(*env)->ReleaseStringUTFChars(env, string, chars);
	return (jlong) a*b*c;
}

/*
 * Class:     MemoryStatus
 * Method:    getTotalPageFile
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getTotalPageFile
  (JNIEnv *env, jobject obj)
{
	MEMORYSTATUS memStat;
	GlobalMemoryStatus(&memStat);
	return (jlong) (int) memStat.dwTotalPageFile;
}

/*
 * Class:     MemoryStatus
 * Method:    getTotalPhysical
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getTotalPhysical
  (JNIEnv *env, jobject obj)
{
	MEMORYSTATUS memStat;
	GlobalMemoryStatus(&memStat);
	return (jlong) (int) memStat.dwTotalPhys;
}

/*
 * Class:     MemoryStatus
 * Method:    getDiskTotalSpace
 * Signature: (Ljava/lang/String;)J
 */
JNIEXPORT jlong JNICALL Java_MemoryStatus_getDiskTotalSpace
  (JNIEnv * env, jobject obj, jstring string)
{
	int a, b, c, d;
	jchar *chars = (*env)->GetStringUTFChars(env, string, JNI_FALSE /* no copy */);
	GetDiskFreeSpace((char *)chars, &a, &b, &c, &d);
	printf("disk total chars : %s\n", chars);
	(*env)->ReleaseStringUTFChars(env, string, chars);
	return (jlong) a*b*d;
}

/*
 * Class:     MemoryStatus
 * Method:    getDiskFreeSpaceInKSC
 * Signature: (Ljava/lang/String;)[B
 */
JNIEXPORT jbyteArray JNICALL Java_MemoryStatus_getDiskFreeSpaceInKSC
  (JNIEnv * env, jobject obj, jstring string)
{
	int a, b, c, d, length;
	char buffer[100];
	jbyteArray bytes;
	jchar * chars;
	chars = (*env)->GetStringUTFChars(env, string, JNI_FALSE /* no copy */);
	GetDiskFreeSpace((char *)chars, &a, &b, &c, &d);
	printf("disk free chars : %s\n", chars);
	(*env)->ReleaseStringUTFChars(env, string, chars);
	sprintf(buffer, "%d ų·Î ¹ÙÀÌÆ®", a*b*c/1000);
	length = strlen(buffer);
	bytes = (*env)->NewByteArray(env, length);
	(*env)->SetByteArrayRegion(env, bytes, 0, length, (jbyte *) buffer);
	return bytes;
}