FileInputStream.c revision 3d43823e17818b3c5f45831f830884917b181454
1/* 2 * Copyright (c) 1997, 2007, 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 <sys/ioctl.h> 27#include <sys/types.h> 28#include <sys/stat.h> 29#include <fcntl.h> 30#include <unistd.h> 31#include "jni.h" 32#include "jni_util.h" 33#include "jlong.h" 34#include "io_util.h" 35#include "io_util_md.h" 36 37#include "jvm.h" 38 39#include "java_io_FileInputStream.h" 40 41#include <fcntl.h> 42#include <limits.h> 43 44#include "io_util_md.h" 45#include "JNIHelp.h" 46 47#define NATIVE_METHOD(className, functionName, signature) \ 48{ #functionName, signature, (void*)(className ## _ ## functionName) } 49 50/*******************************************************************/ 51/* BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/ 52/*******************************************************************/ 53 54jfieldID fis_fd; /* id for jobject 'fd' in java.io.FileInputStream */ 55 56/************************************************************** 57 * static methods to store field ID's in initializers 58 */ 59 60JNIEXPORT void JNICALL 61FileInputStream_initIDs(JNIEnv *env, jclass fdClass) { 62 fis_fd = (*env)->GetFieldID(env, fdClass, "fd", "Ljava/io/FileDescriptor;"); 63} 64 65/************************************************************** 66 * Input stream 67 */ 68 69JNIEXPORT void JNICALL 70FileInputStream_open(JNIEnv *env, jobject this, jstring path) { 71 fileOpen(env, this, path, fis_fd, O_RDONLY); 72} 73 74JNIEXPORT jint JNICALL 75FileInputStream_read0(JNIEnv *env, jobject this) { 76 return readSingle(env, this, fis_fd); 77} 78 79JNIEXPORT jint JNICALL 80FileInputStream_readBytes(JNIEnv *env, jobject this, 81 jbyteArray bytes, jint off, jint len) { 82 return readBytes(env, this, bytes, off, len, fis_fd); 83} 84 85JNIEXPORT jlong JNICALL 86FileInputStream_skip(JNIEnv *env, jobject this, jlong toSkip) { 87 jlong cur = jlong_zero; 88 jlong end = jlong_zero; 89 FD fd = GET_FD(this, fis_fd); 90 if (fd == -1) { 91 JNU_ThrowIOException (env, "Stream Closed"); 92 return 0; 93 } 94 if ((cur = IO_Lseek(fd, (jlong)0, (jint)SEEK_CUR)) == -1) { 95 JNU_ThrowIOExceptionWithLastError(env, "Seek error"); 96 } else if ((end = IO_Lseek(fd, toSkip, (jint)SEEK_CUR)) == -1) { 97 JNU_ThrowIOExceptionWithLastError(env, "Seek error"); 98 } 99 return (end - cur); 100} 101 102// Android added: 103// TODO: Where does this function come from ? Needs a detailed code review. 104// Why wasn't IO_Available used. 105static int available(int fd, jlong *bytes) { 106 jlong cur, end; 107 int mode; 108 struct stat64 buf64; 109 110 if (fstat64(fd, &buf64) >= 0) { 111 mode = buf64.st_mode; 112 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 113 /* 114 * XXX: is the following call interruptible? If so, this might 115 * need to go through the INTERRUPT_IO() wrapper as for other 116 * blocking, interruptible calls in this file. 117 */ 118 int n; 119 if (ioctl(fd, FIONREAD, &n) >= 0) { 120 *bytes = n; 121 return 1; 122 } 123 } 124 } 125 if ((cur = lseek64(fd, 0L, SEEK_CUR)) == -1) { 126 return 0; 127 } else if ((end = lseek64(fd, 0L, SEEK_END)) == -1) { 128 return 0; 129 } else if (lseek64(fd, cur, SEEK_SET) == -1) { 130 return 0; 131 } 132 *bytes = end - cur; 133 return 1; 134} 135 136JNIEXPORT jint JNICALL 137FileInputStream_available(JNIEnv *env, jobject this) { 138 jlong ret; 139 FD fd = GET_FD(this, fis_fd); 140 if (fd == -1) { 141 JNU_ThrowIOException (env, "Stream Closed"); 142 return 0; 143 } 144 if (available(fd, &ret)) { 145 if (ret > INT_MAX) { 146 ret = (jlong) INT_MAX; 147 } 148 return jlong_to_jint(ret); 149 } 150 JNU_ThrowIOExceptionWithLastError(env, NULL); 151 return 0; 152} 153 154JNIEXPORT void JNICALL 155FileInputStream_close0(JNIEnv *env, jobject this) { 156 fileClose(env, this, fis_fd); 157} 158 159static JNINativeMethod gMethods[] = { 160 NATIVE_METHOD(FileInputStream, initIDs, "()V"), 161 NATIVE_METHOD(FileInputStream, open, "(Ljava/lang/String;)V"), 162 NATIVE_METHOD(FileInputStream, read0, "()I"), 163 NATIVE_METHOD(FileInputStream, readBytes, "([BII)I"), 164 NATIVE_METHOD(FileInputStream, skip, "(J)J"), 165 NATIVE_METHOD(FileInputStream, available, "()I"), 166 NATIVE_METHOD(FileInputStream, close0, "()V"), 167}; 168 169void register_java_io_FileInputStream(JNIEnv* env) { 170 jniRegisterNativeMethods(env, "java/io/FileInputStream", gMethods, NELEM(gMethods)); 171} 172