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/*
* epson2_net.c - SANE library for Epson scanners.
*
* Copyright (C) 2006 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* This file is part of the SANE package.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2.
*/
#define DEBUG_DECLARE_ONLY
#include "sane/config.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include "sane/sane.h"
#include "sane/saneopts.h"
#include "sane/sanei_tcp.h"
#include "sane/sanei_config.h"
#include "sane/sanei_backend.h"
#include "epson2.h"
#include "epson2_net.h"
#include "byteorder.h"
#include "sane/sanei_debug.h"
static int
sanei_epson_net_read_raw(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
SANE_Status *status)
{
int ready, read = -1;
fd_set readable;
struct timeval tv;
tv.tv_sec = 10;
tv.tv_usec = 0;
FD_ZERO(&readable);
FD_SET(s->fd, &readable);
ready = select(s->fd + 1, &readable, NULL, NULL, &tv);
if (ready > 0) {
read = sanei_tcp_read(s->fd, buf, wanted);
} else {
DBG(15, "%s: select failed: %d\n", __func__, ready);
}
*status = SANE_STATUS_GOOD;
if (read < wanted) {
*status = SANE_STATUS_IO_ERROR;
}
return read;
}
int
sanei_epson_net_read(Epson_Scanner *s, unsigned char *buf, ssize_t wanted,
SANE_Status * status)
{
ssize_t size;
ssize_t read = 0;
unsigned char header[12];
/* read from buffer, if available */
if (s->netptr != s->netbuf) {
DBG(23, "reading %lu from buffer at %p, %lu available\n",
(u_long) wanted, s->netptr, (u_long) s->netlen);
memcpy(buf, s->netptr, wanted);
read = wanted;
s->netlen -= wanted;
if (s->netlen == 0) {
DBG(23, "%s: freeing %p\n", __func__, s->netbuf);
free(s->netbuf);
s->netbuf = s->netptr = NULL;
s->netlen = 0;
}
return read;
}
/* receive net header */
size = sanei_epson_net_read_raw(s, header, 12, status);
if (size != 12) {
return 0;
}
if (header[0] != 'I' || header[1] != 'S') {
DBG(1, "header mismatch: %02X %02x\n", header[0], header[1]);
*status = SANE_STATUS_IO_ERROR;
return 0;
}
size = be32atoh(&header[6]);
DBG(23, "%s: wanted = %lu, available = %lu\n", __func__,
(u_long) wanted, (u_long) size);
*status = SANE_STATUS_GOOD;
if (size == wanted) {
DBG(15, "%s: full read\n", __func__);
read = sanei_epson_net_read_raw(s, buf, size, status);
if (s->netbuf) {
free(s->netbuf);
s->netbuf = NULL;
s->netlen = 0;
}
if (read < 0) {
return 0;
}
/* } else if (wanted < size && s->netlen == size) { */
} else {
DBG(23, "%s: partial read\n", __func__);
read = sanei_epson_net_read_raw(s, s->netbuf, size, status);
if (read != size) {
return 0;
}
s->netlen = size - wanted;
s->netptr += wanted;
read = wanted;
DBG(23, "0,4 %02x %02x\n", s->netbuf[0], s->netbuf[4]);
DBG(23, "storing %lu to buffer at %p, next read at %p, %lu bytes left\n",
(u_long) size, s->netbuf, s->netptr, (u_long) s->netlen);
memcpy(buf, s->netbuf, wanted);
}
return read;
}
int
sanei_epson_net_write(Epson_Scanner *s, unsigned int cmd, const unsigned char *buf,
size_t buf_size, size_t reply_len, SANE_Status *status)
{
unsigned char *h1, *h2, *payload;
unsigned char *packet = malloc(12 + 8 + buf_size);
/* XXX check allocation failure */
h1 = packet;
h2 = packet + 12;
payload = packet + 12 + 8;
if (reply_len) {
s->netbuf = s->netptr = malloc(reply_len);
s->netlen = reply_len;
DBG(24, "allocated %lu bytes at %p\n",
(u_long) reply_len, s->netbuf);
}
DBG(24, "%s: cmd = %04x, buf = %p, buf_size = %lu, reply_len = %lu\n",
__func__, cmd, buf, (u_long) buf_size, (u_long) reply_len);
memset(h1, 0x00, 12);
memset(h2, 0x00, 8);
h1[0] = 'I';
h1[1] = 'S';
h1[2] = cmd >> 8;
h1[3] = cmd;
h1[4] = 0x00;
h1[5] = 0x0C; /* Don't know what's that */
DBG(24, "H1[0]: %02x %02x %02x %02x\n", h1[0], h1[1], h1[2], h1[3]);
if((cmd >> 8) == 0x20) {
htobe32a(&h1[6], buf_size + 8);
htobe32a(&h2[0], buf_size);
htobe32a(&h2[4], reply_len);
DBG(24, "H1[6]: %02x %02x %02x %02x (%lu)\n", h1[6], h1[7], h1[8], h1[9], (u_long) (buf_size + 8));
DBG(24, "H2[0]: %02x %02x %02x %02x (%lu)\n", h2[0], h2[1], h2[2], h2[3], (u_long) buf_size);
DBG(24, "H2[4]: %02x %02x %02x %02x (%lu)\n", h2[4], h2[5], h2[6], h2[7], (u_long) reply_len);
}
if ((cmd >> 8) == 0x20 && (buf_size || reply_len)) {
if (buf_size)
memcpy(payload, buf, buf_size);
sanei_tcp_write(s->fd, packet, 12 + 8 + buf_size);
}
else
sanei_tcp_write(s->fd, packet, 12);
free(packet);
*status = SANE_STATUS_GOOD;
return buf_size;
}
SANE_Status
sanei_epson_net_lock(struct Epson_Scanner *s)
{
SANE_Status status;
unsigned char buf[1];
DBG(1, "%s\n", __func__);
sanei_epson_net_write(s, 0x2100, NULL, 0, 0, &status);
sanei_epson_net_read(s, buf, 1, &status);
return status;
}
SANE_Status
sanei_epson_net_unlock(struct Epson_Scanner *s)
{
SANE_Status status;
DBG(1, "%s\n", __func__);
sanei_epson_net_write(s, 0x2101, NULL, 0, 0, &status);
/* sanei_epson_net_read(s, buf, 1, &status); */
return status;
}
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