/*

 * Copyright (c) 1998, 2013, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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 <assert.h>

#include <sys/types.h>

#include <sys/time.h>

#include <sys/stat.h>

#include <sys/statvfs.h>

#include <string.h>

#include <stdlib.h>

#include <dlfcn.h>

#include <limits.h>

#include "jni.h"

#include "jni_util.h"

#include "jlong.h"

#include "jvm.h"

#include "io_util.h"

#include "io_util_md.h"

#include "java_io_FileSystem.h"

#include "java_io_UnixFileSystem.h"

#if defined(_ALLBSD_SOURCE)

#define dirent64 dirent

#define readdir64_r readdir_r

#define stat64 stat

#define statvfs64 statvfs

#endif

/* -- Field IDs -- */

static struct {

    jfieldID path;

} ids;

JNIEXPORT void JNICALL

Java_java_io_UnixFileSystem_initIDs(JNIEnv *env, jclass cls)

{

    jclass fileClass = (*env)->FindClass(env, "java/io/File");

    if (!fileClass) return;

    ids.path = (*env)->GetFieldID(env, fileClass,

                                  "path", "Ljava/lang/String;");

}

/* -- Path operations -- */

extern int canonicalize(char *path, const char *out, int len);

JNIEXPORT jstring JNICALL

Java_java_io_UnixFileSystem_canonicalize0(JNIEnv *env, jobject this,

                                          jstring pathname)

{

    jstring rv = NULL;

    WITH_PLATFORM_STRING(env, pathname, path) {

        char canonicalPath[JVM_MAXPATHLEN];

        if (canonicalize((char *)path,

                         canonicalPath, JVM_MAXPATHLEN) < 0) {

            JNU_ThrowIOExceptionWithLastError(env, "Bad pathname");

        } else {

#ifdef MACOSX

            rv = newStringPlatform(env, canonicalPath);

#else

            rv = JNU_NewStringPlatform(env, canonicalPath);

#endif

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

/* -- Attribute accessors -- */

static jboolean

statMode(const char *path, int *mode)

{

    struct stat64 sb;

    if (stat64(path, &sb) == 0) {

        *mode = sb.st_mode;

        return JNI_TRUE;

    }

    return JNI_FALSE;

}

JNIEXPORT jint JNICALL

Java_java_io_UnixFileSystem_getBooleanAttributes0(JNIEnv *env, jobject this,

                                                  jobject file)

{

    jint rv = 0;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        int mode;

        if (statMode(path, &mode)) {

            int fmt = mode & S_IFMT;

            rv = (jint) (java_io_FileSystem_BA_EXISTS

                  | ((fmt == S_IFREG) ? java_io_FileSystem_BA_REGULAR : 0)

                  | ((fmt == S_IFDIR) ? java_io_FileSystem_BA_DIRECTORY : 0));

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_checkAccess(JNIEnv *env, jobject this,

                                        jobject file, jint a)

{

    jboolean rv = JNI_FALSE;

    int mode = 0;

    switch (a) {

    case java_io_FileSystem_ACCESS_READ:

        mode = R_OK;

        break;

    case java_io_FileSystem_ACCESS_WRITE:

        mode = W_OK;

        break;

    case java_io_FileSystem_ACCESS_EXECUTE:

        mode = X_OK;

        break;

    default: assert(0);

    }

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        if (access(path, mode) == 0) {

            rv = JNI_TRUE;

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_setPermission(JNIEnv *env, jobject this,

                                          jobject file,

                                          jint access,

                                          jboolean enable,

                                          jboolean owneronly)

{

    jboolean rv = JNI_FALSE;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        int amode = 0;

        int mode;

        switch (access) {

        case java_io_FileSystem_ACCESS_READ:

            if (owneronly)

                amode = S_IRUSR;

            else

                amode = S_IRUSR | S_IRGRP | S_IROTH;

            break;

        case java_io_FileSystem_ACCESS_WRITE:

            if (owneronly)

                amode = S_IWUSR;

            else

                amode = S_IWUSR | S_IWGRP | S_IWOTH;

            break;

        case java_io_FileSystem_ACCESS_EXECUTE:

            if (owneronly)

                amode = S_IXUSR;

            else

                amode = S_IXUSR | S_IXGRP | S_IXOTH;

            break;

        default:

            assert(0);

        }

        if (statMode(path, &mode)) {

            if (enable)

                mode |= amode;

            else

                mode &= ~amode;

            if (chmod(path, mode) >= 0) {

                rv = JNI_TRUE;

            }

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jlong JNICALL

Java_java_io_UnixFileSystem_getLastModifiedTime(JNIEnv *env, jobject this,

                                                jobject file)

{

    jlong rv = 0;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        struct stat64 sb;

        if (stat64(path, &sb) == 0) {

            rv = 1000 * (jlong)sb.st_mtime;

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jlong JNICALL

Java_java_io_UnixFileSystem_getLength(JNIEnv *env, jobject this,

                                      jobject file)

{

    jlong rv = 0;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        struct stat64 sb;

        if (stat64(path, &sb) == 0) {

            rv = sb.st_size;

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

/* -- File operations -- */

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_createFileExclusively(JNIEnv *env, jclass cls,

                                                  jstring pathname)

{

    jboolean rv = JNI_FALSE;

    WITH_PLATFORM_STRING(env, pathname, path) {

        FD fd;

        /* The root directory always exists */

        if (strcmp (path, "/")) {

            fd = handleOpen(path, O_RDWR | O_CREAT | O_EXCL, 0666);

            if (fd < 0) {

                if (errno != EEXIST)

                    JNU_ThrowIOExceptionWithLastError(env, path);

            } else {

                if (close(fd) == -1)

                    JNU_ThrowIOExceptionWithLastError(env, path);

                rv = JNI_TRUE;

            }

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_delete0(JNIEnv *env, jobject this,

                                    jobject file)

{

    jboolean rv = JNI_FALSE;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        if (remove(path) == 0) {

            rv = JNI_TRUE;

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jobjectArray JNICALL

Java_java_io_UnixFileSystem_list(JNIEnv *env, jobject this,

                                 jobject file)

{

    DIR *dir = NULL;

    struct dirent64 *ptr;

    struct dirent64 *result;

    int len, maxlen;

    jobjectArray rv, old;

    jclass str_class;

    str_class = JNU_ClassString(env);

    CHECK_NULL_RETURN(str_class, NULL);

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        dir = opendir(path);

    } END_PLATFORM_STRING(env, path);

    if (dir == NULL) return NULL;

    ptr = malloc(sizeof(struct dirent64) + (PATH_MAX + 1));

    if (ptr == NULL) {

        JNU_ThrowOutOfMemoryError(env, "heap allocation failed");

        closedir(dir);

        return NULL;

    }

    /* Allocate an initial String array */

    len = 0;

    maxlen = 16;

    rv = (*env)->NewObjectArray(env, maxlen, str_class, NULL);

    if (rv == NULL) goto error;

    /* Scan the directory */

    while ((readdir64_r(dir, ptr, &result) == 0)  && (result != NULL)) {

        jstring name;

        if (!strcmp(ptr->d_name, ".") || !strcmp(ptr->d_name, ".."))

            continue;

        if (len == maxlen) {

            old = rv;

            rv = (*env)->NewObjectArray(env, maxlen <<= 1, str_class, NULL);

            if (rv == NULL) goto error;

            if (JNU_CopyObjectArray(env, rv, old, len) < 0) goto error;

            (*env)->DeleteLocalRef(env, old);

        }

#ifdef MACOSX

        name = newStringPlatform(env, ptr->d_name);

#else

        name = JNU_NewStringPlatform(env, ptr->d_name);

#endif

        if (name == NULL) goto error;

        (*env)->SetObjectArrayElement(env, rv, len++, name);

        (*env)->DeleteLocalRef(env, name);

    }

    closedir(dir);

    free(ptr);

    /* Copy the final results into an appropriately-sized array */

    old = rv;

    rv = (*env)->NewObjectArray(env, len, str_class, NULL);

    if (rv == NULL) {

        return NULL;

    }

    if (JNU_CopyObjectArray(env, rv, old, len) < 0) {

        return NULL;

    }

    return rv;

 error:

    closedir(dir);

    free(ptr);

    return NULL;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_createDirectory(JNIEnv *env, jobject this,

                                            jobject file)

{

    jboolean rv = JNI_FALSE;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        if (mkdir(path, 0777) == 0) {

            rv = JNI_TRUE;

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_rename0(JNIEnv *env, jobject this,

                                    jobject from, jobject to)

{

    jboolean rv = JNI_FALSE;

    WITH_FIELD_PLATFORM_STRING(env, from, ids.path, fromPath) {

        WITH_FIELD_PLATFORM_STRING(env, to, ids.path, toPath) {

            if (rename(fromPath, toPath) == 0) {

                rv = JNI_TRUE;

            }

        } END_PLATFORM_STRING(env, toPath);

    } END_PLATFORM_STRING(env, fromPath);

    return rv;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_setLastModifiedTime(JNIEnv *env, jobject this,

                                                jobject file, jlong time)

{

    jboolean rv = JNI_FALSE;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        struct stat64 sb;

        if (stat64(path, &sb) == 0) {

            struct timeval tv[2];

            /* Preserve access time */

            tv[0].tv_sec = sb.st_atime;

            tv[0].tv_usec = 0;

            /* Change last-modified time */

            tv[1].tv_sec = time / 1000;

            tv[1].tv_usec = (time % 1000) * 1000;

            if (utimes(path, tv) == 0)

                rv = JNI_TRUE;

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jboolean JNICALL

Java_java_io_UnixFileSystem_setReadOnly(JNIEnv *env, jobject this,

                                        jobject file)

{

    jboolean rv = JNI_FALSE;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        int mode;

        if (statMode(path, &mode)) {

            if (chmod(path, mode & ~(S_IWUSR | S_IWGRP | S_IWOTH)) >= 0) {

                rv = JNI_TRUE;

            }

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}

JNIEXPORT jlong JNICALL

Java_java_io_UnixFileSystem_getSpace(JNIEnv *env, jobject this,

                                     jobject file, jint t)

{

    jlong rv = 0L;

    WITH_FIELD_PLATFORM_STRING(env, file, ids.path, path) {

        struct statvfs64 fsstat;

        memset(&fsstat, 0, sizeof(fsstat));

        if (statvfs64(path, &fsstat) == 0) {

            switch(t) {

            case java_io_FileSystem_SPACE_TOTAL:

                rv = jlong_mul(long_to_jlong(fsstat.f_frsize),

                               long_to_jlong(fsstat.f_blocks));

                break;

            case java_io_FileSystem_SPACE_FREE:

                rv = jlong_mul(long_to_jlong(fsstat.f_frsize),

                               long_to_jlong(fsstat.f_bfree));

                break;

            case java_io_FileSystem_SPACE_USABLE:

                rv = jlong_mul(long_to_jlong(fsstat.f_frsize),

                               long_to_jlong(fsstat.f_bavail));

                break;

            default:

                assert(0);

            }

        }

    } END_PLATFORM_STRING(env, path);

    return rv;

}