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 "jni.h" 27 #include "jni_util.h" 28 #include "jlong.h" 29 #include "io_util.h" 30 31 #include "jvm.h" 32 33 #include "java_io_FileInputStream.h" 34 35 #include <fcntl.h> 36 #include <limits.h> 37 38 #include "io_util_md.h" 39 40 /*******************************************************************/ 41 /* BEGIN JNI ********* BEGIN JNI *********** BEGIN JNI ************/ 42 /*******************************************************************/ 43 44 jfieldID fis_fd; /* id for jobject 'fd' in java.io.FileInputStream */ 45 46 /************************************************************** 47 * static methods to store field ID's in initializers 48 */ 49 50 JNIEXPORT void JNICALL 51 Java_java_io_FileInputStream_initIDs(JNIEnv *env, jclass fdClass) { 52 fis_fd = (*env)->GetFieldID(env, fdClass, "fd", "Ljava/io/FileDescriptor;"); 53 } 54 55 /************************************************************** 56 * Input stream 57 */ 58 59 JNIEXPORT void JNICALL 60 Java_java_io_FileInputStream_open(JNIEnv *env, jobject this, jstring path) { 61 fileOpen(env, this, path, fis_fd, O_RDONLY); 62 } 63 64 JNIEXPORT jint JNICALL 65 Java_java_io_FileInputStream_read0(JNIEnv *env, jobject this) { 66 return readSingle(env, this, fis_fd); 67 } 68 69 JNIEXPORT jint JNICALL 70 Java_java_io_FileInputStream_readBytes(JNIEnv *env, jobject this, 71 jbyteArray bytes, jint off, jint len) { 72 return readBytes(env, this, bytes, off, len, fis_fd); 73 } 74 75 JNIEXPORT jlong JNICALL 76 Java_java_io_FileInputStream_skip(JNIEnv *env, jobject this, jlong toSkip) { 77 jlong cur = jlong_zero; 78 jlong end = jlong_zero; 79 FD fd = GET_FD(this, fis_fd); 80 if (fd == -1) { 81 JNU_ThrowIOException (env, "Stream Closed"); 82 return 0; 83 } 84 if ((cur = IO_Lseek(fd, (jlong)0, (jint)SEEK_CUR)) == -1) { 85 JNU_ThrowIOExceptionWithLastError(env, "Seek error"); 86 } else if ((end = IO_Lseek(fd, toSkip, (jint)SEEK_CUR)) == -1) { 87 JNU_ThrowIOExceptionWithLastError(env, "Seek error"); 88 } 89 return (end - cur); 90 } 91 92 JNIEXPORT jint JNICALL 93 Java_java_io_FileInputStream_available(JNIEnv *env, jobject this) { 94 jlong ret; 95 FD fd = GET_FD(this, fis_fd); 96 if (fd == -1) { 97 JNU_ThrowIOException (env, "Stream Closed"); 98 return 0; 99 } 100 if (IO_Available(fd, &ret)) { 101 if (ret > INT_MAX) { 102 ret = (jlong) INT_MAX; 103 } 104 return jlong_to_jint(ret); 105 } 106 JNU_ThrowIOExceptionWithLastError(env, NULL); 107 return 0; 108 }