1 /*
2 * Copyright (c) 1997, 2010, 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 #ifdef MACOSX
29 char* convertToNFDIfNeeded(const char *origPath, char *buf, size_t bufsize);
30 #endif
31
32 extern jfieldID IO_fd_fdID;
33 extern jfieldID IO_handle_fdID;
34
35 #ifdef _ALLBSD_SOURCE
36 #include <fcntl.h>
37 #ifndef O_SYNC
38 #define O_SYNC O_FSYNC
39 #endif
40 #ifndef O_DSYNC
41 #define O_DSYNC O_FSYNC
42 #endif
43 #elif !defined(O_DSYNC) || !defined(O_SYNC)
44 #define O_SYNC (0x0800)
45 #define O_DSYNC (0x2000)
46 #endif
47
48 /*
49 * IO helper functions
50 */
51
52 jint readSingle(JNIEnv *env, jobject this, jfieldID fid);
53 jint readBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
54 jint len, jfieldID fid);
55 void writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid);
56 void writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off,
57 jint len, jboolean append, jfieldID fid);
58 void fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags);
59 void throwFileNotFoundException(JNIEnv *env, jstring path);
60
61
62
63 /*
64 * Macros for managing platform strings. The typical usage pattern is:
65 *
66 * WITH_PLATFORM_STRING(env, string, var) {
67 * doSomethingWith(var);
68 * } END_PLATFORM_STRING(env, var);
69 *
70 * where env is the prevailing JNIEnv,
71 * string is a JNI reference to a java.lang.String object, and
72 * var is the char * variable that will point to the string,
73 * after being converted into the platform encoding.
74 *
75 * The related macro WITH_FIELD_PLATFORM_STRING first extracts the string from
76 * a given field of a given object:
77 *
78 * WITH_FIELD_PLATFORM_STRING(env, object, id, var) {
79 * doSomethingWith(var);
80 * } END_PLATFORM_STRING(env, var);
81 *
82 * where env is the prevailing JNIEnv,
83 * object is a jobject,
84 * id is the field ID of the String field to be extracted, and
85 * var is the char * variable that will point to the string.
86 *
87 * Uses of these macros may be nested as long as each WITH_.._STRING macro
88 * declares a unique variable.
89 */
90
91 #ifdef MACOSX
92
93 #define WITH_PLATFORM_STRING(env, strexp, var) \
94 if (1) { \
95 const char *var; \
96 jstring _##var##str = (strexp); \
97 if (_##var##str == NULL) { \
98 JNU_ThrowNullPointerException((env), NULL); \
99 goto _##var##end; \
100 } \
101 const char *temp_var = JNU_GetStringPlatformChars((env), _##var##str, NULL); \
102 if (temp_var == NULL) goto _##var##end; \
103 char buf[MAXPATHLEN]; \
104 var = convertToNFDIfNeeded(temp_var, buf, sizeof(buf));
105
106 #define WITH_FIELD_PLATFORM_STRING(env, object, id, var) \
107 WITH_PLATFORM_STRING(env, \
108 ((object == NULL) \
109 ? NULL \
110 : (*(env))->GetObjectField((env), (object), (id))), \
111 var)
112
113 #define END_PLATFORM_STRING(env, var) \
114 JNU_ReleaseStringPlatformChars(env, _##var##str, temp_var); \
115 _##var##end: ; \
116 } else ((void)NULL)
117
118 #else
119
120 #define WITH_PLATFORM_STRING(env, strexp, var) \
121 if (1) { \
122 const char *var; \
123 jstring _##var##str = (strexp); \
124 if (_##var##str == NULL) { \
125 JNU_ThrowNullPointerException((env), NULL); \
126 goto _##var##end; \
127 } \
128 var = JNU_GetStringPlatformChars((env), _##var##str, NULL); \
129 if (var == NULL) goto _##var##end;
130
131 #define WITH_FIELD_PLATFORM_STRING(env, object, id, var) \
132 WITH_PLATFORM_STRING(env, \
133 ((object == NULL) \
134 ? NULL \
135 : (*(env))->GetObjectField((env), (object), (id))), \
136 var)
137
138 #define END_PLATFORM_STRING(env, var) \
139 JNU_ReleaseStringPlatformChars(env, _##var##str, var); \
140 _##var##end: ; \
141 } else ((void)NULL)
142
143 #endif
144
145
146 /* Macros for transforming Java Strings into native Unicode strings.
147 * Works analogously to WITH_PLATFORM_STRING.
148 */
149
150 #define WITH_UNICODE_STRING(env, strexp, var) \
151 if (1) { \
152 const jchar *var; \
153 jstring _##var##str = (strexp); \
154 if (_##var##str == NULL) { \
155 JNU_ThrowNullPointerException((env), NULL); \
156 goto _##var##end; \
157 } \
158 var = (*(env))->GetStringChars((env), _##var##str, NULL); \
159 if (var == NULL) goto _##var##end;
160
161 #define END_UNICODE_STRING(env, var) \
162 (*(env))->ReleaseStringChars(env, _##var##str, var); \
163 _##var##end: ; \
164 } else ((void)NULL)