1/*
2 * Copyright (c) 1997, 2016, 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#include <errno.h>
26#include <stdlib.h>
27#include <string.h>
28
29#include "net_util.h"
30
31#include "java_net_SocketOutputStream.h"
32
33#define min(a, b) ((a) < (b) ? (a) : (b))
34
35/*
36 * SocketOutputStream
37 */
38
39static jfieldID IO_fd_fdID;
40
41/*
42 * Class: java_net_SocketOutputStream
43 * Method: init
44 * Signature: ()V
45 */
46JNIEXPORT void JNICALL
47Java_java_net_SocketOutputStream_init(JNIEnv *env, jclass cls) {
48 IO_fd_fdID = NET_GetFileDescriptorID(env);
49}
50
51/*
52 * Class: java_net_SocketOutputStream
53 * Method: socketWrite0
54 * Signature: (Ljava/io/FileDescriptor;[BII)V
55 */
56JNIEXPORT void JNICALL
57Java_java_net_SocketOutputStream_socketWrite0(JNIEnv *env, jobject this,
58 jobject fdObj,
59 jbyteArray data,
60 jint off, jint len) {
61 char *bufP;
62 char BUF[MAX_BUFFER_LEN];
63 int buflen;
64 int fd;
65
66 if (IS_NULL(fdObj)) {
67 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
68 return;
69 } else {
70 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
71 /* Bug 4086704 - If the Socket associated with this file descriptor
72 * was closed (sysCloseFD), the file descriptor is set to -1.
73 */
74 if (fd == -1) {
75 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
76 return;
77 }
78
79 }
80
81 if (len <= MAX_BUFFER_LEN) {
82 bufP = BUF;
83 buflen = MAX_BUFFER_LEN;
84 } else {
85 buflen = min(MAX_HEAP_BUFFER_LEN, len);
86 bufP = (char *)malloc((size_t)buflen);
87
88 /* if heap exhausted resort to stack buffer */
89 if (bufP == NULL) {
90 bufP = BUF;
91 buflen = MAX_BUFFER_LEN;
92 }
93 }
94
95 while(len > 0) {
96 int loff = 0;
97 int chunkLen = min(buflen, len);
98 int llen = chunkLen;
99 (*env)->GetByteArrayRegion(env, data, off, chunkLen, (jbyte *)bufP);
100
101 if ((*env)->ExceptionCheck(env)) {
102 break;
103 } else {
104 while(llen > 0) {
105 int n = NET_Send(fd, bufP + loff, llen, 0);
106 if (n > 0) {
107 llen -= n;
108 loff += n;
109 continue;
110 }
111 JNU_ThrowByNameWithMessageAndLastError
112 (env, "java/net/SocketException", "Write failed");
113 if (bufP != BUF) {
114 free(bufP);
115 }
116 return;
117 }
118 len -= chunkLen;
119 off += chunkLen;
120 }
121 }
122
123 if (bufP != BUF) {
124 free(bufP);
125 }
126}
127