1 /*
2 * Copyright (c) 1997, 2014, 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 extern jfieldID IO_fd_fdID;
30 extern jfieldID IO_handle_fdID;
31
32 #ifdef _ALLBSD_SOURCE
33 #include <fcntl.h>
34 #ifndef O_SYNC
35 #define O_SYNC O_FSYNC
36 #endif
37 #ifndef O_DSYNC
38 #define O_DSYNC O_FSYNC
39 #endif
40 #elif !defined(O_DSYNC) || !defined(O_SYNC)
41 #define O_SYNC (0x0800)
42 #define O_DSYNC (0x2000)
43 #endif
44
45 /*
46 * IO helper functions
47 */
48
49 jint readSingle(JNIEnv *env, jobject this, jfieldID fid);
50 jint readBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
51 jint len, jfieldID fid);
52 void writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid);
53 void writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
54 jint len, jboolean append, jfieldID fid);
55 void fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags);
56 void throwFileNotFoundException(JNIEnv *env, jstring path);
57
58 /*
59 * Macros for managing platform strings. The typical usage pattern is:
60 *
61 * WITH_PLATFORM_STRING(env, string, var) {
62 * doSomethingWith(var);
63 * } END_PLATFORM_STRING(env, var);
64 *
65 * where env is the prevailing JNIEnv,
66 * string is a JNI reference to a java.lang.String object, and
67 * var is the char * variable that will point to the string,
68 * after being converted into the platform encoding.
69 *
70 * The related macro WITH_FIELD_PLATFORM_STRING first extracts the string from
71 * a given field of a given object:
72 *
73 * WITH_FIELD_PLATFORM_STRING(env, object, id, var) {
74 * doSomethingWith(var);
75 * } END_PLATFORM_STRING(env, var);
76 *
77 * where env is the prevailing JNIEnv,
78 * object is a jobject,
79 * id is the field ID of the String field to be extracted, and
80 * var is the char * variable that will point to the string.
81 *
82 * Uses of these macros may be nested as long as each WITH_.._STRING macro
83 * declares a unique variable.
84 */
85
86 #define WITH_PLATFORM_STRING(env, strexp, var) \
87 if (1) { \
88 const char *var; \
89 jstring _##var##str = (strexp); \
90 if (_##var##str == NULL) { \
91 JNU_ThrowNullPointerException((env), NULL); \
92 goto _##var##end; \
93 } \
94 var = JNU_GetStringPlatformChars((env), _##var##str, NULL); \
95 if (var == NULL) goto _##var##end;
96
97 #define WITH_FIELD_PLATFORM_STRING(env, object, id, var) \
98 WITH_PLATFORM_STRING(env, \
99 ((object == NULL) \
100 ? NULL \
101 : (*(env))->GetObjectField((env), (object), (id))), \
102 var)
103
104 #define END_PLATFORM_STRING(env, var) \
105 JNU_ReleaseStringPlatformChars(env, _##var##str, var); \
106 _##var##end: ; \
107 } else ((void)NULL)
108
109
110 /* Macros for transforming Java Strings into native Unicode strings.
111 * Works analogously to WITH_PLATFORM_STRING.
112 */
113
114 #define WITH_UNICODE_STRING(env, strexp, var) \
115 if (1) { \
116 const jchar *var; \
117 jstring _##var##str = (strexp); \
118 if (_##var##str == NULL) { \
119 JNU_ThrowNullPointerException((env), NULL); \
120 goto _##var##end; \
121 } \
122 var = (*(env))->GetStringChars((env), _##var##str, NULL); \
123 if (var == NULL) goto _##var##end;
124
125 #define END_UNICODE_STRING(env, var) \
126 (*(env))->ReleaseStringChars(env, _##var##str, var); \
127 _##var##end: ; \
128 } else ((void)NULL)