Quelle io_util_md.h Sprache: C

/*
* Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

#include "jni.h"
#include "jni_util.h"

/*
* Macros to use the right data type for file descriptors
*/
#define FD jlong

/*
* Prototypes for functions in io_util_md.c called from io_util.c,
* FileDescriptor.c, FileInputStream.c, FileOutputStream.c,
* ProcessImpl_md.c
*/
WCHAR* pathToNTPath(JNIEnv *env, jstring path, jboolean throwFNFE);
WCHAR* fileToNTPath(JNIEnv *env, jobject file, jfieldID id);
JNIEXPORT WCHAR* getPrefixed(const WCHAR* path, int pathlen);
WCHAR* currentDir(int di);
int currentDirLength(const WCHAR* path, int pathlen);
int handleAvailable(FD fd, jlong *pbytes);
int handleSync(FD fd);
jint handleSetLength(FD fd, jlong length);
jlong handleGetLength(FD fd);
JNIEXPORT jint handleRead(FD fd, void *buf, jint len);
jint handleWrite(FD fd, const void *buf, jint len);
jint handleAppend(FD fd, const void *buf, jint len);
void fileDescriptorClose(JNIEnv *env, jobject this);
JNIEXPORT jlong JNICALL
handleLseek(FD fd, jlong offset, jint whence);

/*
* Returns an opaque handle to file named by "path".  If an error occurs,
* returns -1 and an exception is pending.
*/
FD winFileHandleOpen(JNIEnv *env, jstring path, int flags);

/*
* Function to get fd from the java.io.FileDescriptor field of an
* object.  These functions rely on having an appropriately
* defined object with a FileDescriptor object at the fid offset.
* If the FD object is null, return -1 to avoid crashing VM.
*/
FD getFD(JNIEnv *env, jobject cur, jfieldID fid);

/*
* Macros to set/get fd when inside java.io.FileDescriptor
*/
#define THIS_FD(obj) (*env)->GetLongField(env, obj, IO_handle_fdID)

/*
* Route the routines away from VM
*/
#define IO_Append handleAppend
#define IO_Write handleWrite
#define IO_Sync handleSync
#define IO_Read handleRead
#define IO_Lseek handleLseek
#define IO_Available handleAvailable
#define IO_SetLength handleSetLength
#define IO_GetLength handleGetLength

/*
* Setting the handle field in Java_java_io_FileDescriptor_set for
* standard handles stdIn, stdOut, stdErr
*/
#define SET_HANDLE(fd) \
if (fd == 0) { \
    return (jlong)GetStdHandle(STD_INPUT_HANDLE); \
} else if (fd == 1) { \
    return (jlong)GetStdHandle(STD_OUTPUT_HANDLE); \
} else if (fd == 2) { \
    return (jlong)GetStdHandle(STD_ERROR_HANDLE); \
} else { \
    return (jlong)-1; \
} \

/* INVALID_FILE_ATTRIBUTES is not defined in VC++6.0's header files but
* in later release. Keep here just in case someone is still using VC++6.0
*/
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
#endif

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