| /* |
| * Copyright (c) 1997, 2007, 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 <sys/ioctl.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jlong.h" |
| #include "io_util.h" |
| #include "io_util_md.h" |
| |
| #include "jvm.h" |
| |
| |
| #include <fcntl.h> |
| #include <limits.h> |
| |
| #include "io_util_md.h" |
| #include "JNIHelp.h" |
| |
| #define NATIVE_METHOD(className, functionName, signature) \ |
| { #functionName, signature, (void*)(className ## _ ## functionName) } |
| |
| /*******************************************************************/ |
| /* BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/ |
| /*******************************************************************/ |
| |
| jfieldID fis_fd; /* id for jobject 'fd' in java.io.FileInputStream */ |
| |
| /************************************************************** |
| * static methods to store field ID's in initializers |
| */ |
| |
| JNIEXPORT void JNICALL |
| FileInputStream_initIDs(JNIEnv *env, jclass fdClass) { |
| fis_fd = (*env)->GetFieldID(env, fdClass, "fd", "Ljava/io/FileDescriptor;"); |
| } |
| |
| /************************************************************** |
| * Input stream |
| */ |
| |
| JNIEXPORT void JNICALL |
| FileInputStream_open(JNIEnv *env, jobject this, jstring path) { |
| fileOpen(env, this, path, fis_fd, O_RDONLY); |
| } |
| |
| JNIEXPORT jlong JNICALL |
| FileInputStream_skip0(JNIEnv *env, jobject this, jlong toSkip) { |
| jlong cur = jlong_zero; |
| jlong end = jlong_zero; |
| FD fd = GET_FD(this, fis_fd); |
| if (fd == -1) { |
| JNU_ThrowIOException (env, "Stream Closed"); |
| return 0; |
| } |
| if ((cur = IO_Lseek(fd, (jlong)0, (jint)SEEK_CUR)) == -1) { |
| if (errno == ESPIPE) { |
| JNU_ThrowByName(env, "java/io/FileInputStream$UseManualSkipException", NULL); |
| } else { |
| JNU_ThrowIOExceptionWithLastError(env, "Seek error"); |
| } |
| } else if ((end = IO_Lseek(fd, toSkip, (jint)SEEK_CUR)) == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "Seek error"); |
| } |
| return (end - cur); |
| } |
| |
| static int available(int fd, jlong *bytes) { |
| int n; |
| // Unlike the original OpenJdk implementation, we use FIONREAD for all file |
| // types. For regular files, this is specified to return the difference |
| // between the current position and the file size. Note that this can be |
| // negative if we're positioned past the end of the file. We must return 0 |
| // in that case. |
| if (ioctl(fd, FIONREAD, &n) != -1) { |
| if (n < 0) { |
| n = 0; |
| } |
| *bytes = n; |
| return 1; |
| } |
| |
| // FIONREAD is specified to return ENOTTY when fd refers to a file |
| // type for which this ioctl isn't implemented. |
| if (errno == ENOTTY) { |
| *bytes = 0; |
| return 1; |
| } |
| |
| // Raise an exception for all other error types. |
| return 0; |
| } |
| |
| JNIEXPORT jint JNICALL |
| FileInputStream_available0(JNIEnv *env, jobject this) { |
| jlong ret; |
| FD fd = GET_FD(this, fis_fd); |
| if (fd == -1) { |
| JNU_ThrowIOException (env, "Stream Closed"); |
| return 0; |
| } |
| if (available(fd, &ret)) { |
| if (ret > INT_MAX) { |
| ret = (jlong) INT_MAX; |
| } |
| return jlong_to_jint(ret); |
| } |
| JNU_ThrowIOExceptionWithLastError(env, NULL); |
| return 0; |
| } |
| |
| static JNINativeMethod gMethods[] = { |
| NATIVE_METHOD(FileInputStream, initIDs, "()V"), |
| NATIVE_METHOD(FileInputStream, open, "(Ljava/lang/String;)V"), |
| NATIVE_METHOD(FileInputStream, skip0, "(J)J"), |
| NATIVE_METHOD(FileInputStream, available0, "()I"), |
| }; |
| |
| void register_java_io_FileInputStream(JNIEnv* env) { |
| jniRegisterNativeMethods(env, "java/io/FileInputStream", gMethods, NELEM(gMethods)); |
| } |