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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/***************************************************************************
* Description: Simple buffer object to handle buffered socket IO *
* Author: Gal Shachor <shachor@il.ibm.com> *
* Version: $Revision: 466585 $ *
***************************************************************************/
#include "jk_global.h"
#include "jk_sockbuf.h"
static int fill_buffer(jk_sockbuf_t *sb);
int jk_sb_open(jk_sockbuf_t *sb, jk_sock_t sd)
{
if (sb && sd >= 0) {
sb->end = 0;
sb->start = 0;
sb->sd = sd;
return JK_TRUE;
}
return JK_FALSE;
}
int jk_sb_write(jk_sockbuf_t *sb, const void *buf, unsigned sz)
{
if (sb && buf && sz) {
if ((SOCKBUF_SIZE - sb->end) >= sz) {
memcpy(sb->buf + sb->end, buf, sz);
sb->end += sz;
}
else {
if (!jk_sb_flush(sb)) {
return JK_FALSE;
}
if (sz > SOCKBUF_SIZE) {
return (send(sb->sd, (char *)buf, sz, 0) == (int)sz);
}
memcpy(sb->buf + sb->end, buf, sz);
sb->end += sz;
}
return JK_TRUE;
}
return JK_FALSE;
}
int jk_sb_flush(jk_sockbuf_t *sb)
{
if (sb) {
int save_out = sb->end;
sb->end = sb->start = 0;
if (save_out) {
return send(sb->sd, sb->buf, save_out, 0) == save_out;
}
return JK_TRUE;
}
return JK_FALSE;
}
int jk_sb_read(jk_sockbuf_t *sb, char **buf, unsigned sz, unsigned *ac)
{
if (sb && buf && ac) {
unsigned avail;
*ac = 0;
*buf = NULL;
if (sb->end == sb->start) {
sb->end = sb->start = 0;
if (fill_buffer(sb) < 0) {
return JK_FALSE;
}
}
*buf = sb->buf + sb->start;
avail = sb->end - sb->start;
if (avail > sz) {
*ac = sz;
}
else {
*ac = avail;
}
sb->start += *ac;
return JK_TRUE;
}
return JK_FALSE;
}
int jk_sb_gets(jk_sockbuf_t *sb, char **ps)
{
int ret;
if (sb) {
while (1) {
unsigned i;
for (i = sb->start; i < sb->end; i++) {
if (JK_LF == sb->buf[i]) {
if (i > sb->start && JK_CR == sb->buf[i - 1]) {
sb->buf[i - 1] = '\0';
}
else {
sb->buf[i] = '\0';
}
*ps = sb->buf + sb->start;
sb->start = (i + 1);
return JK_TRUE;
}
}
if ((ret = fill_buffer(sb)) < 0) {
return JK_FALSE;
}
else if (ret == 0) {
*ps = sb->buf + sb->start;
if ((SOCKBUF_SIZE - sb->end) > 0) {
sb->buf[sb->end] = '\0';
}
else {
sb->buf[sb->end - 1] = '\0';
}
return JK_TRUE;
}
}
}
return JK_FALSE;
}
/*
* Read data from the socket into the associated buffer, and update the
* start and end indices. May move the data currently in the buffer. If
* new data is read into the buffer (or if it is already full), returns 1.
* If EOF is received on the socket, returns 0. In case of error returns
* -1.
*/
static int fill_buffer(jk_sockbuf_t *sb)
{
int ret;
/*
* First move the current data to the beginning of the buffer
*/
if (sb->start < sb->end) {
if (sb->start > 0) {
unsigned to_copy = sb->end - sb->start;
memmove(sb->buf, sb->buf + sb->start, to_copy);
sb->start = 0;
sb->end = to_copy;
}
}
else {
sb->start = sb->end = 0;
}
/*
* In the unlikely case where the buffer is already full, we won't be
* reading anything and we'd be calling recv with a 0 count.
*/
if ((SOCKBUF_SIZE - sb->end) > 0) {
/*
* Now, read more data
*/
ret = recv(sb->sd, sb->buf + sb->end, SOCKBUF_SIZE - sb->end, 0);
/* 0 is EOF/SHUTDOWN, -1 is SOCK_ERROR */
if (ret <= 0) {
return ret;
}
sb->end += ret;
}
return 1;
}
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