/*

 * Copyright (c) 2001, 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.

 */

/* Access APIs for WinXP and above */

#ifndef _WIN32_WINNT

#define _WIN32_WINNT 0x0501

#endif

#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#include <direct.h>

#include <windows.h>

#include <io.h>

#include "jni.h"

#include "io_util.h"

#include "jlong.h"

#include "io_util_md.h"

#include "dirent_md.h"

#include "java_io_FileSystem.h"

#define MAX_PATH_LENGTH 1024

static struct {

    jfieldID path;

} ids;

/**

 * GetFinalPathNameByHandle is available on Windows Vista and newer

 */

typedef BOOL (WINAPI* GetFinalPathNameByHandleProc) (HANDLE, LPWSTR, DWORD, DWORD);

static GetFinalPathNameByHandleProc GetFinalPathNameByHandle_func;

JNIEXPORT void JNICALL

Java_java_io_WinNTFileSystem_initIDs(JNIEnv *env, jclass cls)

{

    HMODULE handle;

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

    if (!fileClass) return;

    ids.path =

             (*env)->GetFieldID(env, fileClass, "path", "Ljava/lang/String;");

    // GetFinalPathNameByHandle requires Windows Vista or newer

    if (GetModuleHandleExW((GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |

                            GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT),

                           (LPCWSTR)&CreateFileW, &handle) != 0)

    {

        GetFinalPathNameByHandle_func = (GetFinalPathNameByHandleProc)

            GetProcAddress(handle, "GetFinalPathNameByHandleW");

    }

}

/* -- Path operations -- */

extern int wcanonicalize(const WCHAR *path, WCHAR *out, int len);

extern int wcanonicalizeWithPrefix(const WCHAR *canonicalPrefix, const WCHAR *pathWithCanonicalPrefix, WCHAR *out, int len);

/**

 * Retrieves the fully resolved (final) path for the given path or NULL

 * if the function fails.

 */

static WCHAR* getFinalPath(const WCHAR *path)

{

    HANDLE h;

    WCHAR *result;

    DWORD error;

    /* Need Windows Vista or newer to get the final path */

    if (GetFinalPathNameByHandle_func == NULL)

        return NULL;

    h = CreateFileW(path,

                    FILE_READ_ATTRIBUTES,

                    FILE_SHARE_DELETE |

                        FILE_SHARE_READ | FILE_SHARE_WRITE,

                    NULL,

                    OPEN_EXISTING,

                    FILE_FLAG_BACKUP_SEMANTICS,

                    NULL);

    if (h == INVALID_HANDLE_VALUE)

        return NULL;

    /**

     * Allocate a buffer for the resolved path. For a long path we may need

     * to allocate a larger buffer.

     */

    result = (WCHAR*)malloc(MAX_PATH * sizeof(WCHAR));

    if (result != NULL) {

        DWORD len = (*GetFinalPathNameByHandle_func)(h, result, MAX_PATH, 0);

        if (len >= MAX_PATH) {

            /* retry with a buffer of the right size */

            WCHAR* newResult = (WCHAR*)realloc(result, (len+1) * sizeof(WCHAR));

            if (newResult != NULL) {

                result = newResult;

                len = (*GetFinalPathNameByHandle_func)(h, result, len, 0);

            } else {

                len = 0;

            }

        }

        if (len > 0) {

            /**

             * Strip prefix (should be \\?\ or \\?\UNC)

             */

            if (result[0] == L'\\' && result[1] == L'\\' &&

                result[2] == L'?' && result[3] == L'\\')

            {

                int isUnc = (result[4] == L'U' &&

                             result[5] == L'N' &&

                             result[6] == L'C');

                int prefixLen = (isUnc) ? 7 : 4;

                /* actual result length (includes terminator) */

                int resultLen = len - prefixLen + (isUnc ? 1 : 0) + 1;

                /* copy result without prefix into new buffer */

                WCHAR *tmp = (WCHAR*)malloc(resultLen * sizeof(WCHAR));

                if (tmp == NULL) {

                    len = 0;

                } else {

                    WCHAR *p = result;

                    p += prefixLen;

                    if (isUnc) {

                        WCHAR *p2 = tmp;

                        p2[0] = L'\\';

                        p2++;

                        wcscpy(p2, p);

                    } else {

                        wcscpy(tmp, p);

                    }

                    free(result);

                    result = tmp;

                }

            }

        }

        /* unable to get final path */

        if (len == 0 && result != NULL) {

            free(result);

            result = NULL;

        }

    }

    error = GetLastError();

    if (CloseHandle(h))

        SetLastError(error);

    return result;

}

/**

 * Retrieves file information for the specified file. If the file is

 * symbolic link then the information on fully resolved target is

 * returned.

 */

static BOOL getFileInformation(const WCHAR *path,

                               BY_HANDLE_FILE_INFORMATION *finfo)

{

    BOOL result;

    DWORD error;

    HANDLE h = CreateFileW(path,

                           FILE_READ_ATTRIBUTES,

                           FILE_SHARE_DELETE |

                               FILE_SHARE_READ | FILE_SHARE_WRITE,

                           NULL,

                           OPEN_EXISTING,

                           FILE_FLAG_BACKUP_SEMANTICS,

                           NULL);

    if (h == INVALID_HANDLE_VALUE)

        return FALSE;

    result = GetFileInformationByHandle(h, finfo);

    error = GetLastError();

    if (CloseHandle(h))

        SetLastError(error);

    return result;

}

/**

 * If the given attributes are the attributes of a reparse point, then

 * read and return the attributes of the special cases.

 */

DWORD getFinalAttributesIfReparsePoint(WCHAR *path, DWORD a)

{

    if ((a != INVALID_FILE_ATTRIBUTES) &&

        ((a & FILE_ATTRIBUTE_REPARSE_POINT) != 0))

    {

        BY_HANDLE_FILE_INFORMATION finfo;

        BOOL res = getFileInformation(path, &finfo);

        a = (res) ? finfo.dwFileAttributes : INVALID_FILE_ATTRIBUTES;

    }

    return a;

}

/**

 * Take special cases into account when retrieving the attributes

 * of path

 */

DWORD getFinalAttributes(WCHAR *path)

{

    DWORD attr = INVALID_FILE_ATTRIBUTES;

    WIN32_FILE_ATTRIBUTE_DATA wfad;

    WIN32_FIND_DATAW wfd;

    HANDLE h;

    if (GetFileAttributesExW(path, GetFileExInfoStandard, &wfad)) {

        attr = getFinalAttributesIfReparsePoint(path, wfad.dwFileAttributes);

    } else if (GetLastError() == ERROR_SHARING_VIOLATION &&

               (h = FindFirstFileW(path, &wfd)) != INVALID_HANDLE_VALUE) {

        attr = getFinalAttributesIfReparsePoint(path, wfd.dwFileAttributes);

    }

    return attr;

}

JNIEXPORT jstring JNICALL

Java_java_io_WinNTFileSystem_canonicalize0(JNIEnv *env, jobject this,

                                           jstring pathname)

{

    jstring rv = NULL;

    WCHAR canonicalPath[MAX_PATH_LENGTH];

    WITH_UNICODE_STRING(env, pathname, path) {

        /*we estimate the max length of memory needed as

          "currentDir. length + pathname.length"

         */

        int len = (int)wcslen(path);

        len += currentDirLength(path, len);

        if (len  > MAX_PATH_LENGTH - 1) {

            WCHAR *cp = (WCHAR*)malloc(len * sizeof(WCHAR));

            if (cp != NULL) {

                if (wcanonicalize(path, cp, len) >= 0) {

                    rv = (*env)->NewString(env, cp, (jsize)wcslen(cp));

                }

                free(cp);

            }

        } else

        if (wcanonicalize(path, canonicalPath, MAX_PATH_LENGTH) >= 0) {

            rv = (*env)->NewString(env, canonicalPath, (jsize)wcslen(canonicalPath));

        }

    } END_UNICODE_STRING(env, path);

    if (rv == NULL) {

        JNU_ThrowIOExceptionWithLastError(env, "Bad pathname");

    }

    return rv;

}

JNIEXPORT jstring JNICALL

Java_java_io_WinNTFileSystem_canonicalizeWithPrefix0(JNIEnv *env, jobject this,

                                                     jstring canonicalPrefixString,

                                                     jstring pathWithCanonicalPrefixString)

{

    jstring rv = NULL;

    WCHAR canonicalPath[MAX_PATH_LENGTH];

    WITH_UNICODE_STRING(env, canonicalPrefixString, canonicalPrefix) {

        WITH_UNICODE_STRING(env, pathWithCanonicalPrefixString, pathWithCanonicalPrefix) {

            int len = (int)wcslen(canonicalPrefix) + MAX_PATH;

            if (len > MAX_PATH_LENGTH) {

                WCHAR *cp = (WCHAR*)malloc(len * sizeof(WCHAR));

                if (cp != NULL) {

                    if (wcanonicalizeWithPrefix(canonicalPrefix,

                                                pathWithCanonicalPrefix,

                                                cp, len) >= 0) {

                      rv = (*env)->NewString(env, cp, (jsize)wcslen(cp));

                    }

                    free(cp);

                }

            } else

            if (wcanonicalizeWithPrefix(canonicalPrefix,

                                        pathWithCanonicalPrefix,

                                        canonicalPath, MAX_PATH_LENGTH) >= 0) {

                rv = (*env)->NewString(env, canonicalPath, (jsize)wcslen(canonicalPath));

            }

        } END_UNICODE_STRING(env, pathWithCanonicalPrefix);

    } END_UNICODE_STRING(env, canonicalPrefix);

    if (rv == NULL) {

        JNU_ThrowIOExceptionWithLastError(env, "Bad pathname");

    }

    return rv;

}

/* -- Attribute accessors -- */

/* Check whether or not the file name in "path" is a Windows reserved

   device name (CON, PRN, AUX, NUL, COM[1-9], LPT[1-9]) based on the

   returned result from GetFullPathName, which should be in thr form of

   "\\.\[ReservedDeviceName]" if the path represents a reserved device

   name.

   Note1: GetFullPathName doesn't think "CLOCK$" (which is no longer

   important anyway) is a device name, so we don't check it here.

   GetFileAttributesEx will catch it later by returning 0 on NT/XP/

   200X.

   Note2: Theoretically the implementation could just lookup the table

   below linearly if the first 4 characters of the fullpath returned

   from GetFullPathName are "\\.\". The current implementation should

   achieve the same result. If Microsoft add more names into their

   reserved device name repository in the future, which probably will

   never happen, we will need to revisit the lookup implementation.

static WCHAR* ReservedDEviceNames[] = {

    L"CON", L"PRN", L"AUX", L"NUL",

    L"COM1", L"COM2", L"COM3", L"COM4", L"COM5", L"COM6", L"COM7", L"COM8", L"COM9",

    L"LPT1", L"LPT2", L"LPT3", L"LPT4", L"LPT5", L"LPT6", L"LPT7", L"LPT8", L"LPT9",

    L"CLOCK$"

};

 */

static BOOL isReservedDeviceNameW(WCHAR* path) {

#define BUFSIZE 9

    WCHAR buf[BUFSIZE];

    WCHAR *lpf = NULL;

    DWORD retLen = GetFullPathNameW(path,

                                   BUFSIZE,

                                   buf,

                                   &lpf);

    if ((retLen == BUFSIZE - 1 || retLen == BUFSIZE - 2) &&

        buf[0] == L'\\' && buf[1] == L'\\' &&

        buf[2] == L'.' && buf[3] == L'\\') {

        WCHAR* dname = _wcsupr(buf + 4);

        if (wcscmp(dname, L"CON") == 0 ||

            wcscmp(dname, L"PRN") == 0 ||

            wcscmp(dname, L"AUX") == 0 ||

            wcscmp(dname, L"NUL") == 0)

            return TRUE;

        if ((wcsncmp(dname, L"COM", 3) == 0 ||

             wcsncmp(dname, L"LPT", 3) == 0) &&

            dname[3] - L'0' > 0 &&

            dname[3] - L'0' <= 9)

            return TRUE;

    }

    return FALSE;

}

JNIEXPORT jint JNICALL

Java_java_io_WinNTFileSystem_getBooleanAttributes(JNIEnv *env, jobject this,

                                                  jobject file)

{

    jint rv = 0;

    jint pathlen;

    WCHAR *pathbuf = fileToNTPath(env, file, ids.path);

    if (pathbuf == NULL)

        return rv;

    if (!isReservedDeviceNameW(pathbuf)) {

        DWORD a = getFinalAttributes(pathbuf);

        if (a != INVALID_FILE_ATTRIBUTES) {

            rv = (java_io_FileSystem_BA_EXISTS

                | ((a & FILE_ATTRIBUTE_DIRECTORY)

                    ? java_io_FileSystem_BA_DIRECTORY

                    : java_io_FileSystem_BA_REGULAR)

                | ((a & FILE_ATTRIBUTE_HIDDEN)

                    ? java_io_FileSystem_BA_HIDDEN : 0));

        }

    }

    free(pathbuf);

    return rv;

}

JNIEXPORT jboolean

JNICALL Java_java_io_WinNTFileSystem_checkAccess(JNIEnv *env, jobject this,

                                                 jobject file, jint access)

{

    DWORD attr;

    WCHAR *pathbuf = fileToNTPath(env, file, ids.path);

    if (pathbuf == NULL)

        return JNI_FALSE;

    attr = GetFileAttributesW(pathbuf);

    attr = getFinalAttributesIfReparsePoint(pathbuf, attr);

    free(pathbuf);

    if (attr == INVALID_FILE_ATTRIBUTES)

        return JNI_FALSE;

    switch (access) {

    case java_io_FileSystem_ACCESS_READ:

    case java_io_FileSystem_ACCESS_EXECUTE:

        return JNI_TRUE;

    case java_io_FileSystem_ACCESS_WRITE:

        /* Read-only attribute ignored on directories */

        if ((attr & FILE_ATTRIBUTE_DIRECTORY) ||

            (attr & FILE_ATTRIBUTE_READONLY) == 0)

            return JNI_TRUE;

        else

            return JNI_FALSE;

    default:

        assert(0);

        return JNI_FALSE;

    }

}

JNIEXPORT jboolean JNICALL

Java_java_io_WinNTFileSystem_setPermission(JNIEnv *env, jobject this,

                                           jobject file,

                                           jint access,

                                           jboolean enable,

                                           jboolean owneronly)

{

    jboolean rv = JNI_FALSE;

    WCHAR *pathbuf;

    DWORD a;

    if (access == java_io_FileSystem_ACCESS_READ ||

        access == java_io_FileSystem_ACCESS_EXECUTE) {

        return enable;

    }

    pathbuf = fileToNTPath(env, file, ids.path);

    if (pathbuf == NULL)

        return JNI_FALSE;

    a = GetFileAttributesW(pathbuf);

    /* if reparse point, get final target */

    if ((a != INVALID_FILE_ATTRIBUTES) &&

        ((a & FILE_ATTRIBUTE_REPARSE_POINT) != 0))

    {

        WCHAR *fp = getFinalPath(pathbuf);

        if (fp == NULL) {

            a = INVALID_FILE_ATTRIBUTES;

        } else {

            free(pathbuf);

            pathbuf = fp;

            a = GetFileAttributesW(pathbuf);

        }

    }

    if ((a != INVALID_FILE_ATTRIBUTES) &&

        ((a & FILE_ATTRIBUTE_DIRECTORY) == 0))

    {

        if (enable)

            a =  a & ~FILE_ATTRIBUTE_READONLY;

        else

            a =  a | FILE_ATTRIBUTE_READONLY;

        if (SetFileAttributesW(pathbuf, a))

            rv = JNI_TRUE;

    }

    free(pathbuf);

    return rv;

}

JNIEXPORT jlong JNICALL

Java_java_io_WinNTFileSystem_getLastModifiedTime(JNIEnv *env, jobject this,

                                                 jobject file)

{

    jlong rv = 0;

    LARGE_INTEGER modTime;

    FILETIME t;

    HANDLE h;

    WCHAR *pathbuf = fileToNTPath(env, file, ids.path);

    if (pathbuf == NULL)

        return rv;

    h = CreateFileW(pathbuf,

                    /* Device query access */

                    0,

                    /* Share it */

                    FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,

                    /* No security attributes */

                    NULL,

                    /* Open existing or fail */

                    OPEN_EXISTING,

                    /* Backup semantics for directories */

                    FILE_FLAG_BACKUP_SEMANTICS,

                    /* No template file */

                    NULL);

    if (h != INVALID_HANDLE_VALUE) {

        if (GetFileTime(h, NULL, NULL, &t)) {

            modTime.LowPart = (DWORD) t.dwLowDateTime;

            modTime.HighPart = (LONG) t.dwHighDateTime;

            rv = modTime.QuadPart / 10000;

            rv -= 11644473600000;

        }

        CloseHandle(h);

    }

    free(pathbuf);

    return rv;

}

JNIEXPORT jlong JNICALL

Java_java_io_WinNTFileSystem_getLength(JNIEnv *env, jobject this, jobject file)

{

    jlong rv = 0;

    WIN32_FILE_ATTRIBUTE_DATA wfad;

    WCHAR *pathbuf = fileToNTPath(env, file, ids.path);

    if (pathbuf == NULL)

        return rv;

    if (GetFileAttributesExW(pathbuf,

                             GetFileExInfoStandard,

                             &wfad)) {

        if ((wfad.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) == 0) {

            rv = wfad.nFileSizeHigh * ((jlong)MAXDWORD + 1) + wfad.nFileSizeLow;