111 lines
3.6 KiB
C
111 lines
3.6 KiB
C
/*
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* Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <fcntl.h>
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#include <limits.h>
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#include "jni.h"
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#include "jni_util.h"
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#include "jlong.h"
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#include "io_util.h"
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#include "jvm.h"
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#include "java_io_FileInputStream.h"
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#include "io_util_md.h"
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/*******************************************************************/
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/* BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/
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/*******************************************************************/
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jfieldID fis_fd; /* id for jobject 'fd' in java.io.FileInputStream */
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/**************************************************************
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* static methods to store field ID's in initializers
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*/
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JNIEXPORT void JNICALL
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Java_java_io_FileInputStream_initIDs(JNIEnv *env, jclass fdClass) {
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fis_fd = (*env)->GetFieldID(env, fdClass, "fd", "Ljava/io/FileDescriptor;");
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}
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/**************************************************************
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* Input stream
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*/
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JNIEXPORT void JNICALL
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Java_java_io_FileInputStream_open0(JNIEnv *env, jobject this, jstring path) {
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fileOpen(env, this, path, fis_fd, O_RDONLY);
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}
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JNIEXPORT jint JNICALL
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Java_java_io_FileInputStream_read0(JNIEnv *env, jobject this) {
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return readSingle(env, this, fis_fd);
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}
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JNIEXPORT jint JNICALL
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Java_java_io_FileInputStream_readBytes(JNIEnv *env, jobject this,
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jbyteArray bytes, jint off, jint len) {
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return readBytes(env, this, bytes, off, len, fis_fd);
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}
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JNIEXPORT jlong JNICALL
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Java_java_io_FileInputStream_skip(JNIEnv *env, jobject this, jlong toSkip) {
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jlong cur = jlong_zero;
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jlong end = jlong_zero;
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FD fd = GET_FD(this, fis_fd);
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if (fd == -1) {
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JNU_ThrowIOException (env, "Stream Closed");
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return 0;
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}
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if ((cur = IO_Lseek(fd, (jlong)0, (jint)SEEK_CUR)) == -1) {
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JNU_ThrowIOExceptionWithLastError(env, "Seek error");
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} else if ((end = IO_Lseek(fd, toSkip, (jint)SEEK_CUR)) == -1) {
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JNU_ThrowIOExceptionWithLastError(env, "Seek error");
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}
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return (end - cur);
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}
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JNIEXPORT jint JNICALL
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Java_java_io_FileInputStream_available(JNIEnv *env, jobject this) {
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jlong ret;
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FD fd = GET_FD(this, fis_fd);
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if (fd == -1) {
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JNU_ThrowIOException (env, "Stream Closed");
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return 0;
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}
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if (IO_Available(fd, &ret)) {
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if (ret > INT_MAX) {
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ret = (jlong) INT_MAX;
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} else if (ret < 0) {
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ret = 0;
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}
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return jlong_to_jint(ret);
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}
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JNU_ThrowIOExceptionWithLastError(env, NULL);
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return 0;
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}
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