| /* |
| * Copyright (c) 1994, 2013, 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 <stdlib.h> |
| #include <string.h> |
| #include <stddef.h> |
| |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "io_util.h" |
| #include "io_util_md.h" |
| |
| /* IO helper functions */ |
| |
| jint |
| readSingle(JNIEnv *env, jobject this, jfieldID fid) { |
| jint nread; |
| char ret; |
| FD fd = GET_FD(this, fid); |
| if (fd == -1) { |
| JNU_ThrowIOException(env, "Stream Closed"); |
| return -1; |
| } |
| nread = IO_Read(fd, &ret, 1); |
| if (nread == 0) { /* EOF */ |
| return -1; |
| } else if (nread == -1) { /* error */ |
| JNU_ThrowIOExceptionWithLastError(env, "Read error"); |
| } |
| return ret & 0xFF; |
| } |
| |
| /* The maximum size of a stack-allocated buffer. |
| */ |
| #define BUF_SIZE 8192 |
| |
| /* |
| * Returns true if the array slice defined by the given offset and length |
| * is out of bounds. |
| */ |
| static int |
| outOfBounds(JNIEnv *env, jint off, jint len, jbyteArray array) { |
| return ((off < 0) || |
| (len < 0) || |
| // We are very careful to avoid signed integer overflow, |
| // the result of which is undefined in C. |
| ((*env)->GetArrayLength(env, array) - off < len)); |
| } |
| |
| jint |
| readBytes(JNIEnv *env, jobject this, jbyteArray bytes, |
| jint off, jint len, jfieldID fid) |
| { |
| jint nread; |
| char stackBuf[BUF_SIZE]; |
| char *buf = NULL; |
| FD fd; |
| |
| if (IS_NULL(bytes)) { |
| JNU_ThrowNullPointerException(env, NULL); |
| return -1; |
| } |
| |
| if (outOfBounds(env, off, len, bytes)) { |
| JNU_ThrowByName(env, "java/lang/IndexOutOfBoundsException", NULL); |
| return -1; |
| } |
| |
| if (len == 0) { |
| return 0; |
| } else if (len > BUF_SIZE) { |
| buf = malloc(len); |
| if (buf == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return 0; |
| } |
| } else { |
| buf = stackBuf; |
| } |
| |
| fd = GET_FD(this, fid); |
| if (fd == -1) { |
| JNU_ThrowIOException(env, "Stream Closed"); |
| nread = -1; |
| } else { |
| nread = IO_Read(fd, buf, len); |
| if (nread > 0) { |
| (*env)->SetByteArrayRegion(env, bytes, off, nread, (jbyte *)buf); |
| } else if (nread == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "Read error"); |
| } else { /* EOF */ |
| nread = -1; |
| } |
| } |
| |
| if (buf != stackBuf) { |
| free(buf); |
| } |
| return nread; |
| } |
| |
| void |
| writeSingle(JNIEnv *env, jobject this, jint byte, jboolean append, jfieldID fid) { |
| // Discard the 24 high-order bits of byte. See OutputStream#write(int) |
| char c = (char) byte; |
| jint n; |
| FD fd = GET_FD(this, fid); |
| if (fd == -1) { |
| JNU_ThrowIOException(env, "Stream Closed"); |
| return; |
| } |
| if (append == JNI_TRUE) { |
| n = IO_Append(fd, &c, 1); |
| } else { |
| n = IO_Write(fd, &c, 1); |
| } |
| if (n == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "Write error"); |
| } |
| } |
| |
| void |
| writeBytes(JNIEnv *env, jobject this, jbyteArray bytes, |
| jint off, jint len, jboolean append, jfieldID fid) |
| { |
| jint n; |
| char stackBuf[BUF_SIZE]; |
| char *buf = NULL; |
| FD fd; |
| |
| if (IS_NULL(bytes)) { |
| JNU_ThrowNullPointerException(env, NULL); |
| return; |
| } |
| |
| if (outOfBounds(env, off, len, bytes)) { |
| JNU_ThrowByName(env, "java/lang/IndexOutOfBoundsException", NULL); |
| return; |
| } |
| |
| if (len == 0) { |
| return; |
| } else if (len > BUF_SIZE) { |
| buf = malloc(len); |
| if (buf == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return; |
| } |
| } else { |
| buf = stackBuf; |
| } |
| |
| (*env)->GetByteArrayRegion(env, bytes, off, len, (jbyte *)buf); |
| |
| if (!(*env)->ExceptionOccurred(env)) { |
| off = 0; |
| while (len > 0) { |
| fd = GET_FD(this, fid); |
| if (fd == -1) { |
| JNU_ThrowIOException(env, "Stream Closed"); |
| break; |
| } |
| if (append == JNI_TRUE) { |
| n = IO_Append(fd, buf+off, len); |
| } else { |
| n = IO_Write(fd, buf+off, len); |
| } |
| if (n == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "Write error"); |
| break; |
| } |
| off += n; |
| len -= n; |
| } |
| } |
| if (buf != stackBuf) { |
| free(buf); |
| } |
| } |
| |
| void |
| throwFileNotFoundException(JNIEnv *env, jstring path) |
| { |
| char buf[256]; |
| size_t n; |
| jobject x; |
| jstring why = NULL; |
| |
| n = getLastErrorString(buf, sizeof(buf)); |
| if (n > 0) { |
| #ifdef WIN32 |
| why = (*env)->NewStringUTF(env, buf); |
| #else |
| why = JNU_NewStringPlatform(env, buf); |
| #endif |
| CHECK_NULL(why); |
| } |
| x = JNU_NewObjectByName(env, |
| "java/io/FileNotFoundException", |
| "(Ljava/lang/String;Ljava/lang/String;)V", |
| path, why); |
| if (x != NULL) { |
| (*env)->Throw(env, x); |
| } |
| } |