1 /*

     2  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

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

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

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 #include "jni.h"

    27 #include "jni_util.h"

    28 

    29 /*

    30  * Macros to use the right data type for file descriptors

    31  */

    32 #define FD jlong

    33 

    34 /*

    35  * Prototypes for functions in io_util_md.c called from io_util.c,

    36  * FileDescriptor.c, FileInputStream.c, FileOutputStream.c

    37  */

    38 WCHAR* pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE);

    39 WCHAR* fileToNTPath(JNIEnv *env, jobject file, jfieldID id);

    40 WCHAR* getPrefixed(const WCHAR* path, int pathlen);

    41 WCHAR* currentDir(int di);

    42 int currentDirLength(const WCHAR* path, int pathlen);

    43 int handleAvailable(FD fd, jlong *pbytes);

    44 int handleSync(FD fd);

    45 int handleSetLength(FD fd, jlong length);

    46 JNIEXPORT jint handleRead(FD fd, void *buf, jint len);

    47 jint handleWrite(FD fd, const void *buf, jint len);

    48 jint handleAppend(FD fd, const void *buf, jint len);

    49 jint handleClose(JNIEnv *env, jobject this, jfieldID fid);

    50 jlong handleLseek(FD fd, jlong offset, jint whence);

    51 

    52 /*

    53  * Returns an opaque handle to file named by "path".  If an error occurs,

    54  * returns -1 and an exception is pending.

    55  */

    56 FD winFileHandleOpen(JNIEnv *env, jstring path, int flags);

    57 

    58 /*

    59  * Macros to set/get fd from the java.io.FileDescriptor.

    60  * If GetObjectField returns null, SET_FD will stop and GET_FD

    61  * will simply return -1 to avoid crashing VM.

    62  */

    63 #define SET_FD(this, fd, fid) \

    64     if ((*env)->GetObjectField(env, (this), (fid)) != NULL) \

    65         (*env)->SetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID, (fd))

    66 

    67 #define GET_FD(this, fid) \

    68     ((*env)->GetObjectField(env, (this), (fid)) == NULL) ? \

    69       -1 : (*env)->GetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID)

    70 

    71 /*

    72  * Macros to set/get fd when inside java.io.FileDescriptor

    73  */

    74 #define THIS_FD(obj) (*env)->GetLongField(env, obj, IO_handle_fdID)

    75 

    76 /*

    77  * Route the routines away from VM

    78  */

    79 #define IO_Append handleAppend

    80 #define IO_Write handleWrite

    81 #define IO_Sync handleSync

    82 #define IO_Read handleRead

    83 #define IO_Lseek handleLseek

    84 #define IO_Available handleAvailable

    85 #define IO_SetLength handleSetLength

    86 

    87 /*

    88  * Setting the handle field in Java_java_io_FileDescriptor_set for

    89  * standard handles stdIn, stdOut, stdErr

    90  */

    91 #define SET_HANDLE(fd) \

    92 if (fd == 0) { \

    93     return (jlong)GetStdHandle(STD_INPUT_HANDLE); \

    94 } else if (fd == 1) { \

    95     return (jlong)GetStdHandle(STD_OUTPUT_HANDLE); \

    96 } else if (fd == 2) { \

    97     return (jlong)GetStdHandle(STD_ERROR_HANDLE); \

    98 } else { \

    99     return (jlong)-1; \

   100 } \

   101 

   102 /* INVALID_FILE_ATTRIBUTES is not defined in VC++6.0's header files but

   103  * in later release. Keep here just in case someone is still using VC++6.0

   104  */

   105 #ifndef INVALID_FILE_ATTRIBUTES

   106 #define INVALID_FILE_ATTRIBUTES ((DWORD)-1)

   107 #endif