1 /* 2 * Copyright (c) 2003, 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 /* 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 */ 39 WCHAR* pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE); 40 WCHAR* fileToNTPath(JNIEnv *env, jobject file, jfieldID id); 41 WCHAR* getPrefixed(const WCHAR* path, int pathlen); 42 WCHAR* currentDir(int di); 43 int currentDirLength(const WCHAR* path, int pathlen); 44 int handleAvailable(FD fd, jlong *pbytes); 45 int handleSync(FD fd); 46 int handleSetLength(FD fd, jlong length); 47 jlong handleGetLength(FD fd); 48 JNIEXPORT jint handleRead(FD fd, void *buf, jint len); 49 jint handleWrite(FD fd, const void *buf, jint len); 50 jint handleAppend(FD fd, const void *buf, jint len); 51 void handleClose(JNIEnv *env, jobject this, jfieldID fid); 52 void fileDescriptorClose(JNIEnv *env, jobject this); 53 JNIEXPORT jlong JNICALL 54 handleLseek(FD fd, jlong offset, jint whence); 55 56 /* 57 * Returns an opaque handle to file named by "path". If an error occurs, 58 * returns -1 and an exception is pending. 59 */ 60 JNIEXPORT FD JNICALL 61 winFileHandleOpen(JNIEnv *env, jstring path, int flags); 62 63 /* 64 * Macros to set/get fd from the java.io.FileDescriptor. 65 * If GetObjectField returns null, SET_FD will stop and GET_FD 66 * will simply return -1 to avoid crashing VM. 67 */ 68 #define SET_FD(this, fd, fid) \ 69 if ((*env)->GetObjectField(env, (this), (fid)) != NULL) \ 70 (*env)->SetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID, (fd)) 71 72 #define GET_FD(this, fid) \ 73 ((*env)->GetObjectField(env, (this), (fid)) == NULL) ? \ 74 -1 : (*env)->GetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID) 75 76 /* 77 * Macros to set/get fd when inside java.io.FileDescriptor 78 */ 79 #define THIS_FD(obj) (*env)->GetLongField(env, obj, IO_handle_fdID) 80 81 /* 82 * Route the routines away from VM 83 */ 84 #define IO_Append handleAppend 85 #define IO_Write handleWrite 86 #define IO_Sync handleSync 87 #define IO_Read handleRead 88 #define IO_Lseek handleLseek 89 #define IO_Available handleAvailable 90 #define IO_SetLength handleSetLength 91 #define IO_GetLength handleGetLength 92 93 /* 94 * Setting the handle field in Java_java_io_FileDescriptor_set for 95 * standard handles stdIn, stdOut, stdErr 96 */ 97 #define SET_HANDLE(fd) \ 98 if (fd == 0) { \ 99 return (jlong)GetStdHandle(STD_INPUT_HANDLE); \ 100 } else if (fd == 1) { \ 101 return (jlong)GetStdHandle(STD_OUTPUT_HANDLE); \ 102 } else if (fd == 2) { \ 103 return (jlong)GetStdHandle(STD_ERROR_HANDLE); \ 104 } else { \ 105 return (jlong)-1; \ 106 } \ 107 108 /* INVALID_FILE_ATTRIBUTES is not defined in VC++6.0's header files but 109 * in later release. Keep here just in case someone is still using VC++6.0 110 */ 111 #ifndef INVALID_FILE_ATTRIBUTES 112 #define INVALID_FILE_ATTRIBUTES ((DWORD)-1) 113 #endif