1 /* 2 * Copyright (c) 1997, 2018, 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 extern jfieldID IO_append_fdID; 32 33 #ifdef _ALLBSD_SOURCE 34 #include <fcntl.h> 35 #ifndef O_SYNC 36 #define O_SYNC O_FSYNC 37 #endif 38 #ifndef O_DSYNC 39 #define O_DSYNC O_FSYNC 40 #endif 41 #elif !defined(O_DSYNC) || !defined(O_SYNC) 42 #define O_SYNC (0x0800) 43 #define O_DSYNC (0x2000) 44 #endif 45 46 /* 47 * IO helper functions 48 */ 49 50 jint readSingle(JNIEnv *env, jobject this, jfieldID fid); 51 jint readBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off, 52 jint len, jfieldID fid); 53 void writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid); 54 void writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, jint off, 55 jint len, jboolean append, jfieldID fid); 56 void fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags); 57 void throwFileNotFoundException(JNIEnv *env, jstring path); 58 59 /* 60 * Macros for managing platform strings. The typical usage pattern is: 61 * 62 * WITH_PLATFORM_STRING(env, string, var) { 63 * doSomethingWith(var); 64 * } END_PLATFORM_STRING(env, var); 65 * 66 * where env is the prevailing JNIEnv, 67 * string is a JNI reference to a java.lang.String object, and 68 * var is the char * variable that will point to the string, 69 * after being converted into the platform encoding. 70 * 71 * The related macro WITH_FIELD_PLATFORM_STRING first extracts the string from 72 * a given field of a given object: 73 * 74 * WITH_FIELD_PLATFORM_STRING(env, object, id, var) { 75 * doSomethingWith(var); 76 * } END_PLATFORM_STRING(env, var); 77 * 78 * where env is the prevailing JNIEnv, 79 * object is a jobject, 80 * id is the field ID of the String field to be extracted, and 81 * var is the char * variable that will point to the string. 82 * 83 * Uses of these macros may be nested as long as each WITH_.._STRING macro 84 * declares a unique variable. 85 */ 86 87 #define WITH_PLATFORM_STRING(env, strexp, var) \ 88 if (1) { \ 89 const char *var; \ 90 jstring _##var##str = (strexp); \ 91 if (_##var##str == NULL) { \ 92 JNU_ThrowNullPointerException((env), NULL); \ 93 goto _##var##end; \ 94 } \ 95 var = JNU_GetStringPlatformChars((env), _##var##str, NULL); \ 96 if (var == NULL) goto _##var##end; 97 98 #define WITH_FIELD_PLATFORM_STRING(env, object, id, var) \ 99 WITH_PLATFORM_STRING(env, \ 100 ((object == NULL) \ 101 ? NULL \ 102 : (*(env))->GetObjectField((env), (object), (id))), \ 103 var) 104 105 #define END_PLATFORM_STRING(env, var) \ 106 JNU_ReleaseStringPlatformChars(env, _##var##str, var); \ 107 _##var##end: ; \ 108 } else ((void)NULL) 109 110 111 /* Macros for transforming Java Strings into native Unicode strings. 112 * Works analogously to WITH_PLATFORM_STRING. 113 */ 114 115 #define WITH_UNICODE_STRING(env, strexp, var) \ 116 if (1) { \ 117 const jchar *var; \ 118 jstring _##var##str = (strexp); \ 119 if (_##var##str == NULL) { \ 120 JNU_ThrowNullPointerException((env), NULL); \ 121 goto _##var##end; \ 122 } \ 123 var = (*(env))->GetStringChars((env), _##var##str, NULL); \ 124 if (var == NULL) goto _##var##end; 125 126 #define END_UNICODE_STRING(env, var) \ 127 (*(env))->ReleaseStringChars(env, _##var##str, var); \ 128 _##var##end: ; \ 129 } else ((void)NULL) 130