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/*
* Copyright (c) 2023, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <stdlib.h>
#include "jni.h"
#include "jni_util.h"
#ifdef WINDOWS
#include <windows.h>
#include <fileapi.h>
#include <winerror.h>
#else
#include <errno.h>
#include <string.h>
#if __APPLE__
#include <sys/param.h>
#include <sys/mount.h>
#else
#include <sys/statfs.h>
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
#ifdef WINDOWS
jboolean initialized = JNI_FALSE;
BOOL(WINAPI * pfnGetDiskSpaceInformation)(LPCWSTR, LPVOID) = NULL;
#endif
//
// root the root of the volume
// sizes[0] total size: number of bytes in the volume
// sizes[1] total space: number of bytes visible to the caller
// sizes[2] free space: number of free bytes in the volume
// sizes[3] usable space: number of bytes available to the caller
//
JNIEXPORT jboolean JNICALL
Java_GetXSpace_getSpace0
(JNIEnv *env, jclass cls, jstring root, jlongArray sizes)
{
jboolean totalSpaceIsEstimated = JNI_FALSE;
jlong array[4];
const jchar* strchars = (*env)->GetStringChars(env, root, NULL);
if (strchars == NULL) {
JNU_ThrowByNameWithLastError(env, "java/lang/RuntimeException",
"GetStringChars");
return JNI_FALSE;
}
#ifdef WINDOWS
if (initialized == JNI_FALSE) {
initialized = JNI_TRUE;
HMODULE hmod = GetModuleHandleW(L"kernel32");
if (hmod != NULL) {
*(FARPROC*)&pfnGetDiskSpaceInformation =
GetProcAddress(hmod, "GetDiskSpaceInformationW");
}
}
LPCWSTR path = (LPCWSTR)strchars;
if (pfnGetDiskSpaceInformation != NULL) {
// use GetDiskSpaceInformationW
DISK_SPACE_INFORMATION diskSpaceInfo;
BOOL hres = pfnGetDiskSpaceInformation(path, &diskSpaceInfo);
(*env)->ReleaseStringChars(env, root, strchars);
if (FAILED(hres)) {
JNU_ThrowByNameWithLastError(env, "java/lang/RuntimeException",
"GetDiskSpaceInformationW");
return totalSpaceIsEstimated;
}
ULONGLONG bytesPerAllocationUnit =
diskSpaceInfo.SectorsPerAllocationUnit*diskSpaceInfo.BytesPerSector;
array[0] = (jlong)(diskSpaceInfo.ActualTotalAllocationUnits*
bytesPerAllocationUnit);
array[1] = (jlong)(diskSpaceInfo.CallerTotalAllocationUnits*
bytesPerAllocationUnit);
array[2] = (jlong)(diskSpaceInfo.ActualAvailableAllocationUnits*
bytesPerAllocationUnit);
array[3] = (jlong)(diskSpaceInfo.CallerAvailableAllocationUnits*
bytesPerAllocationUnit);
} else {
totalSpaceIsEstimated = JNI_TRUE;
// if GetDiskSpaceInformationW is unavailable ("The specified
// procedure could not be found"), fall back to GetDiskFreeSpaceExW
ULARGE_INTEGER freeBytesAvailable;
ULARGE_INTEGER totalNumberOfBytes;
ULARGE_INTEGER totalNumberOfFreeBytes;
BOOL hres = GetDiskFreeSpaceExW(path, &freeBytesAvailable,
&totalNumberOfBytes, &totalNumberOfFreeBytes);
(*env)->ReleaseStringChars(env, root, strchars);
if (FAILED(hres)) {
JNU_ThrowByNameWithLastError(env, "java/lang/RuntimeException",
"GetDiskFreeSpaceExW");
return totalSpaceIsEstimated;
}
// If quotas are in effect, it is impossible to obtain the volume size,
// so estimate it as free + used = free + (visible - available)
ULONGLONG used = totalNumberOfBytes.QuadPart - freeBytesAvailable.QuadPart;
array[0] = (jlong)(totalNumberOfFreeBytes.QuadPart + used);
array[1] = (jlong)totalNumberOfBytes.QuadPart;
array[2] = (jlong)totalNumberOfFreeBytes.QuadPart;
array[3] = (jlong)freeBytesAvailable.QuadPart;
}
#else
int len = (int)(*env)->GetStringLength(env, root);
char* chars = (char*)malloc((len + 1)*sizeof(char));
if (chars == NULL) {
(*env)->ReleaseStringChars(env, root, strchars);
JNU_ThrowByNameWithLastError(env, "java/lang/RuntimeException",
"malloc");
return JNI_FALSE;
}
for (int i = 0; i < len; i++) {
chars[i] = (char)strchars[i];
}
chars[len] = '\0';
(*env)->ReleaseStringChars(env, root, strchars);
struct statfs buf;
int result = statfs(chars, &buf);
free(chars);
if (result < 0) {
JNU_ThrowByNameWithLastError(env, "java/lang/RuntimeException",
strerror(errno));
return totalSpaceIsEstimated;
}
array[0] = (jlong)(buf.f_blocks*buf.f_bsize);
array[1] = array[0]; // number visible is the same as the total size
array[2] = (jlong)(buf.f_bfree*buf.f_bsize);
array[3] = (jlong)(buf.f_bavail*buf.f_bsize);
#endif
(*env)->SetLongArrayRegion(env, sizes, 0, 4, array);
return totalSpaceIsEstimated;
}
JNIEXPORT jboolean JNICALL
Java_GetXSpace_isCDDrive
(JNIEnv *env, jclass cls, jstring root)
{
#ifdef WINDOWS
const jchar* strchars = (*env)->GetStringChars(env, root, NULL);
if (strchars == NULL) {
JNU_ThrowByNameWithLastError(env, "java/lang/RuntimeException",
"GetStringChars");
return JNI_FALSE;
}
LPCWSTR path = (LPCWSTR)strchars;
UINT driveType = GetDriveTypeW(path);
(*env)->ReleaseStringChars(env, root, strchars);
if (driveType != DRIVE_CDROM) {
return JNI_FALSE;
}
return JNI_TRUE;
#else
return JNI_FALSE;
#endif
}
#ifdef __cplusplus
}
#endif
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