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-rw-r--r--backend/epsonds-net.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/backend/epsonds-net.c b/backend/epsonds-net.c
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index 0000000..8ea236b
--- /dev/null
+++ b/backend/epsonds-net.c
@@ -0,0 +1,278 @@
+/*
+ * epsonds-net.c - SANE library for Epson scanners.
+ *
+ * Copyright (C) 2006-2016 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 "epsonds.h"
+#include "epsonds-net.h"
+
+#include "byteorder.h"
+
+#include "sane/sanei_debug.h"
+
+static int
+epsonds_net_read_raw(epsonds_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
+epsonds_net_read(epsonds_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 (wanted && 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 = epsonds_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;
+ }
+
+ // incoming payload size
+ 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__);
+
+ if (size) {
+ read = epsonds_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) {
+
+ DBG(23, "%s: long tail\n", __func__);
+
+ read = epsonds_net_read_raw(s, s->netbuf, size, status);
+ if (read != size) {
+ return 0;
+ }
+
+ memcpy(buf, s->netbuf, wanted);
+ read = wanted;
+
+ free(s->netbuf);
+ s->netbuf = NULL;
+ s->netlen = 0;
+
+ } else {
+
+ DBG(23, "%s: partial read\n", __func__);
+
+ read = epsonds_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;
+}
+
+SANE_Status
+epsonds_net_request_read(epsonds_scanner *s, size_t len)
+{
+ SANE_Status status;
+ epsonds_net_write(s, 0x2000, NULL, 0, len, &status);
+ return status;
+}
+
+int
+epsonds_net_write(epsonds_scanner *s, unsigned int cmd, const unsigned char *buf,
+ size_t buf_size, size_t reply_len, SANE_Status *status)
+{
+ unsigned char *h1, *h2;
+ unsigned char *packet = malloc(12 + 8);
+
+ /* XXX check allocation failure */
+
+ h1 = packet; // packet header
+ h2 = packet + 12; // data header
+
+ 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; // packet type
+ h1[3] = cmd; // data type
+
+ h1[4] = 0x00;
+ h1[5] = 0x0C; // data offset
+
+ DBG(24, "H1[0]: %02x %02x %02x %02x\n", h1[0], h1[1], h1[2], h1[3]);
+
+ // 0x20 passthru
+ // 0x21 job control
+
+ if (buf_size) {
+ htobe32a(&h1[6], buf_size);
+ }
+
+ if((cmd >> 8) == 0x20) {
+
+ htobe32a(&h1[6], buf_size + 8); // data size (data header + payload)
+
+ htobe32a(&h2[0], buf_size); // payload size
+ htobe32a(&h2[4], reply_len); // expected answer size
+
+ 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)) {
+
+ // send header + data header
+ sanei_tcp_write(s->fd, packet, 12 + 8);
+
+ } else {
+ sanei_tcp_write(s->fd, packet, 12);
+ }
+
+ // send payload
+ if (buf_size)
+ sanei_tcp_write(s->fd, buf, buf_size);
+
+ free(packet);
+
+ *status = SANE_STATUS_GOOD;
+ return buf_size;
+}
+
+SANE_Status
+epsonds_net_lock(struct epsonds_scanner *s)
+{
+ SANE_Status status;
+ unsigned char buf[7] = "\x01\xa0\x04\x00\x00\x01\x2c";
+
+ DBG(1, "%s\n", __func__);
+
+ epsonds_net_write(s, 0x2100, buf, 7, 0, &status);
+ epsonds_net_read(s, buf, 1, &status);
+
+ // buf[0] should be ACK, 0x06
+
+ return status;
+}
+
+SANE_Status
+epsonds_net_unlock(struct epsonds_scanner *s)
+{
+ SANE_Status status;
+
+ DBG(1, "%s\n", __func__);
+
+ epsonds_net_write(s, 0x2101, NULL, 0, 0, &status);
+/* epsonds_net_read(s, buf, 1, &status); */
+ return status;
+}
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