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/*
* Copyright (c) 2014-2015, NORDUnet A/S.
* See LICENSE for licensing information.
*/
#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "net_read_write.h"
#include "erlport.h"
static ssize_t
read_length(size_t length_size)
{
unsigned char buf[4];
if (length_size != 2 && length_size != 4) {
return -1;
}
if (length_size > sizeof(buf)) {
return -1;
}
ssize_t ret;
ret = net_read(0, (char *)buf, length_size);
if (ret != (ssize_t) length_size) {
return -1;
}
if (length_size == 2) {
return (ssize_t)(((unsigned long)buf[0] << 8) | (unsigned long)buf[1]);
} else {
return (ssize_t)(((unsigned long)buf[0] << 24) |
((unsigned long)buf[1] << 16) |
((unsigned long)buf[2] << 8) |
(unsigned long)buf[3]);
}
}
ssize_t
read_command(unsigned char *buf, size_t maxlen, size_t length_size)
{
ssize_t len;
len = read_length(length_size);
if (len < 0) {
return -1;
}
if (len > (ssize_t) maxlen) {
return -1;
}
return net_read(0, (char *)buf, (size_t)len);
}
static int
write_length(size_t len, size_t length_size)
{
unsigned char buf[4];
if (length_size != 2 && length_size != 4) {
return -1;
}
if (length_size == 2) {
buf[0] = (len >> 8) & 0xff;
buf[1] = len & 0xff;
} else {
buf[0] = (len >> 24) & 0xff;
buf[1] = (len >> 16) & 0xff;
buf[2] = (len >> 8) & 0xff;
buf[3] = len & 0xff;
}
ssize_t ret;
ret = net_write(1, (char *)buf, length_size);
if (ret < 0) {
return -1;
}
if (ret != (ssize_t) length_size) {
return -1;
}
return 0;
}
int
write_reply(unsigned char *msg, size_t len, size_t length_size)
{
ssize_t ret;
ret = write_length(len, length_size);
if (ret < 0) {
return -1;
}
ret = net_write(1, (char *)msg, len);
if (ret < 0) {
return -1;
}
return 0;
}
int
write_status(char *msg)
{
return write_reply((unsigned char *)msg, strlen(msg), 2);
}
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