diff options
Diffstat (limited to 'backend/epson2_net.c')
| -rw-r--r-- | backend/epson2_net.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/backend/epson2_net.c b/backend/epson2_net.c new file mode 100644 index 0000000..c7b4873 --- /dev/null +++ b/backend/epson2_net.c @@ -0,0 +1,229 @@ +/* + * 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" + +#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" + +int +sanei_epson_net_read_raw(Epson_Scanner *s, unsigned char *buf, size_t wanted, + SANE_Status * status) +{ + size_t size, read = 0; + + *status = SANE_STATUS_GOOD; + + while (read < wanted) { + size = sanei_tcp_read(s->fd, buf + read, wanted - read); + + if (size == 0) + break; + + read += size; + } + + 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_tcp_read(s->fd, header, 12); + if (size != 12) { + *status = SANE_STATUS_IO_ERROR; + 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", __FUNCTION__, + (u_long) wanted, (u_long) size); + + *status = SANE_STATUS_GOOD; + + if (size == wanted) { + + DBG(15, "%s: full read\n", __func__); + read = sanei_tcp_read(s->fd, buf, size); + + if (s->netbuf) { + free(s->netbuf); + s->netbuf = NULL; + s->netlen = 0; + } + + if (read < 0) { + *status = SANE_STATUS_IO_ERROR; + return 0; + } + +/* } else if (wanted < size && s->netlen == size) { */ + } else { + DBG(23, "%s: partial read\n", __func__); + + read = sanei_tcp_read(s->fd, s->netbuf, size); + if (read != size) { + *status = SANE_STATUS_IO_ERROR; + 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", + __FUNCTION__, 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; +} |