1/*
2 * Copyright (c) 2003, 2015, 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 * ProcessImpl_md.c
38 */
39WCHAR* pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE);
40WCHAR* fileToNTPath(JNIEnv *env, jobject file, jfieldID id);
41WCHAR* getPrefixed(const WCHAR* path, int pathlen);
42WCHAR* currentDir(int di);
43int currentDirLength(const WCHAR* path, int pathlen);
44int handleAvailable(FD fd, jlong *pbytes);
45int handleSync(FD fd);
46int handleSetLength(FD fd, jlong length);
47jlong handleGetLength(FD fd);
48JNIEXPORT jint handleRead(FD fd, void *buf, jint len);
49jint handleWrite(FD fd, const void *buf, jint len);
50jint handleAppend(FD fd, const void *buf, jint len);
51jint handleClose(JNIEnv *env, jobject this, jfieldID fid);
52jlong handleLseek(FD fd, jlong offset, jint whence);
53
54/*
55 * Returns an opaque handle to file named by "path".  If an error occurs,
56 * returns -1 and an exception is pending.
57 */
58FD winFileHandleOpen(JNIEnv *env, jstring path, int flags);
59
60/*
61 * Macros to set/get fd from the java.io.FileDescriptor.
62 * If GetObjectField returns null, SET_FD will stop and GET_FD
63 * will simply return -1 to avoid crashing VM.
64 */
65#define SET_FD(this, fd, fid) \
66    if ((*env)->GetObjectField(env, (this), (fid)) != NULL) \
67        (*env)->SetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID, (fd))
68
69#define GET_FD(this, fid) \
70    ((*env)->GetObjectField(env, (this), (fid)) == NULL) ? \
71      -1 : (*env)->GetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID)
72
73/*
74 * Macros to set/get fd when inside java.io.FileDescriptor
75 */
76#define THIS_FD(obj) (*env)->GetLongField(env, obj, IO_handle_fdID)
77
78/*
79 * Route the routines away from VM
80 */
81#define IO_Append handleAppend
82#define IO_Write handleWrite
83#define IO_Sync handleSync
84#define IO_Read handleRead
85#define IO_Lseek handleLseek
86#define IO_Available handleAvailable
87#define IO_SetLength handleSetLength
88#define IO_GetLength handleGetLength
89
90/*
91 * Setting the handle field in Java_java_io_FileDescriptor_set for
92 * standard handles stdIn, stdOut, stdErr
93 */
94#define SET_HANDLE(fd) \
95if (fd == 0) { \
96    return (jlong)GetStdHandle(STD_INPUT_HANDLE); \
97} else if (fd == 1) { \
98    return (jlong)GetStdHandle(STD_OUTPUT_HANDLE); \
99} else if (fd == 2) { \
100    return (jlong)GetStdHandle(STD_ERROR_HANDLE); \
101} else { \
102    return (jlong)-1; \
103} \
104
105/* INVALID_FILE_ATTRIBUTES is not defined in VC++6.0's header files but
106 * in later release. Keep here just in case someone is still using VC++6.0
107 */
108#ifndef INVALID_FILE_ATTRIBUTES
109#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
110#endif
111