1 /*
   2  * Copyright (c) 2003, 2013, 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  */
  38 WCHAR* pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE);
  39 WCHAR* fileToNTPath(JNIEnv *env, jobject file, jfieldID id);
  40 WCHAR* getPrefixed(const WCHAR* path, int pathlen);
  41 WCHAR* currentDir(int di);
  42 int currentDirLength(const WCHAR* path, int pathlen);
  43 int handleAvailable(FD fd, jlong *pbytes);
  44 int handleSync(FD fd);
  45 int handleSetLength(FD fd, jlong length);
  46 JNIEXPORT jint handleRead(FD fd, void *buf, jint len);
  47 jint handleWrite(JNIEnv *env, jobject this, jfieldID fid,
  48                  const void *buf, jint len);
  49 jint handleClose(JNIEnv *env, jobject this, jfieldID fid);
  50 jlong handleLseek(FD fd, jlong offset, jint whence);
  51 
  52 /*
  53  * Returns an opaque handle to file named by "path".  If an error occurs,
  54  * returns -1 and an exception is pending.
  55  */
  56 FD winFileHandleOpen(JNIEnv *env, jstring path, int flags);
  57 
  58 /*
  59  * Macros to set/get fd from the java.io.FileDescriptor.
  60  * If GetObjectField returns null, SET_FD will stop and GET_FD
  61  * will simply return -1 to avoid crashing VM.
  62  */
  63 #define SET_FD(this, fd, fid) \
  64     if ((*env)->GetObjectField(env, (this), (fid)) != NULL) \
  65         (*env)->SetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID, (fd))
  66 
  67 #define GET_FD(this, fid) \
  68     ((*env)->GetObjectField(env, (this), (fid)) == NULL) ? \
  69       -1 : (*env)->GetLongField(env, (*env)->GetObjectField(env, (this), (fid)), IO_handle_fdID)
  70 
  71 /*
  72  * Macros to set/get fd when inside java.io.FileDescriptor
  73  */
  74 #define THIS_FD(obj) (*env)->GetLongField(env, obj, IO_handle_fdID)
  75 
  76 /*
  77  * Route the routines away from VM
  78  */
  79 #define IO_Write handleWrite
  80 #define IO_Sync handleSync
  81 #define IO_Read handleRead
  82 #define IO_Lseek handleLseek
  83 #define IO_Available handleAvailable
  84 #define IO_SetLength handleSetLength
  85 
  86 /*
  87  * Setting the handle field in Java_java_io_FileDescriptor_set for
  88  * standard handles stdIn, stdOut, stdErr
  89  */
  90 #define SET_HANDLE(fd) \
  91 if (fd == 0) { \
  92     return (jlong)GetStdHandle(STD_INPUT_HANDLE); \
  93 } else if (fd == 1) { \
  94     return (jlong)GetStdHandle(STD_OUTPUT_HANDLE); \
  95 } else if (fd == 2) { \
  96     return (jlong)GetStdHandle(STD_ERROR_HANDLE); \
  97 } else { \
  98     return (jlong)-1; \
  99 } \
 100 
 101 /* INVALID_FILE_ATTRIBUTES is not defined in VC++6.0's header files but
 102  * in later release. Keep here just in case someone is still using VC++6.0
 103  */
 104 #ifndef INVALID_FILE_ATTRIBUTES
 105 #define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
 106 #endif