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selphy_print/backend_common.c

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/*
* CUPS Backend common code
*
* Copyright (c) 2007-2015 Solomon Peachy <pizza@shaftnet.org>
*
* The latest version of this program can be found at:
*
* http://git.shaftnet.org/cgit/selphy_print.git
*
* 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; either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* [http://www.gnu.org/licenses/gpl-3.0.html]
*
*/
#include "backend_common.h"
#define BACKEND_VERSION "0.53"
#ifndef URI_PREFIX
#error "Must Define URI_PREFIX"
#endif
/* Global variables */
int dyesub_debug = 0;
int extra_vid = -1;
int extra_pid = -1;
int extra_type = -1;
char *use_serno = NULL;
/* Support Functions */
#define ID_BUF_SIZE 2048
static char *get_device_id(struct libusb_device_handle *dev)
{
int length;
int iface = 0;
char *buf = malloc(ID_BUF_SIZE + 1);
if (libusb_kernel_driver_active(dev, iface))
libusb_detach_kernel_driver(dev, iface);
libusb_claim_interface(dev, iface);
if (libusb_control_transfer(dev,
LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_ENDPOINT_IN |
LIBUSB_RECIPIENT_INTERFACE,
0, 0,
(iface << 8),
(unsigned char *)buf, ID_BUF_SIZE, 5000) < 0)
{
*buf = '\0';
goto done;
}
/* length is the first two bytes, MSB first */
length = (((unsigned)buf[0] & 255) << 8) |
((unsigned)buf[1] & 255);
/* Sanity checks */
if (length > ID_BUF_SIZE || length < 14)
length = (((unsigned)buf[1] & 255) << 8) |
((unsigned)buf[0] & 255);
if (length > ID_BUF_SIZE)
length = ID_BUF_SIZE;
if (length < 14) {
*buf = '\0';
goto done;
}
/* Move, and terminate */
memmove(buf, buf + 2, length);
buf[length] = '\0';
done:
libusb_release_interface(dev, iface);
return buf;
}
/* Used with the IEEE1284 deviceid string parsing */
struct deviceid_dict {
char *key;
char *val;
};
#define MAX_DICT 32
static int parse1284_data(const char *device_id, struct deviceid_dict* dict)
{
char *ptr;
char key[256];
char val[256];
int num = 0;
//[whitespace]key[whitespace]:[whitespace]value[whitespace];
while (*device_id && num < MAX_DICT) {
/* Skip leading spaces */
if (*device_id == ' ')
device_id++;
if (!*device_id)
break;
/* Work out key */
for (ptr = key; *device_id && *device_id != ':'; device_id++)
*ptr++ = *device_id;
if (!*device_id)
break;
while (ptr > key && *(ptr-1) == ' ')
ptr--;
*ptr = 0;
device_id++;
if (!*device_id)
break;
/* Next up, value */
for (ptr = val; *device_id && *device_id != ';'; device_id++)
*ptr++ = *device_id;
if (!*device_id)
break;
while (ptr > val && *(ptr-1) == ' ')
ptr--;
*ptr = 0;
device_id++;
/* Add it to the dictionary */
dict[num].key = strdup(key);
dict[num].val = strdup(val);
num++;
if (!*device_id)
break;
}
return num;
};
static char *dict_find(const char *key, int dlen, struct deviceid_dict* dict)
{
while(dlen) {
if (!strcmp(key, dict->key))
return dict->val;
dlen--;
dict++;
}
return NULL;
}
/* I/O functions */
int read_data(struct libusb_device_handle *dev, uint8_t endp,
uint8_t *buf, int buflen, int *readlen)
{
int ret;
/* Clear buffer */
memset(buf, 0, buflen);
ret = libusb_bulk_transfer(dev, endp,
buf,
buflen,
readlen,
10000);
if (ret < 0) {
ERROR("Failure to receive data from printer (libusb error %d: (%d/%d from 0x%02x))\n", ret, *readlen, buflen, endp);
goto done;
}
if (dyesub_debug) {
DEBUG("Received %d bytes from printer\n", *readlen);
}
if ((dyesub_debug > 1 && buflen < 4096) ||
dyesub_debug > 2) {
int i = *readlen;
DEBUG("<- ");
while(i > 0) {
if ((*readlen-i) != 0 &&
(*readlen-i) % 16 == 0) {
DEBUG2("\n");
DEBUG(" ");
}
DEBUG2("%02x ", buf[*readlen-i]);
i--;
}
DEBUG2("\n");
}
done:
return ret;
}
int send_data(struct libusb_device_handle *dev, uint8_t endp,
uint8_t *buf, int len)
{
int num = 0;
if (dyesub_debug) {
DEBUG("Sending %d bytes to printer\n", len);
}
while (len) {
int len2 = (len > 65536) ? 65536: len;
int ret = libusb_bulk_transfer(dev, endp,
buf, len2,
&num, 15000);
if ((dyesub_debug > 1 && len < 4096) ||
dyesub_debug > 2) {
int i = num;
DEBUG("-> ");
while(i > 0) {
if ((num-i) != 0 &&
(num-i) % 16 == 0) {
DEBUG2("\n");
DEBUG(" ");
}
DEBUG2("%02x ", buf[num-i]);
i--;
}
DEBUG2("\n");
}
if (ret < 0) {
ERROR("Failure to send data to printer (libusb error %d: (%d/%d to 0x%02x))\n", ret, num, len, endp);
return ret;
}
len -= num;
buf += num;
}
return 0;
}
/* More stuff */
int terminate = 0;
static void sigterm_handler(int signum) {
UNUSED(signum);
terminate = 1;
INFO("Job Cancelled");
}
static char *sanitize_string(char *str) {
int len = strlen(str);
while(len && (str[len-1] <= 0x20)) {
str[len-1] = 0;
len--;
}
return str;
}
/*
These functions are Public Domain code obtained from:
http://www.geekhideout.com/urlcode.shtml
*/
#include <ctype.h> /* for isalnum() */
static char to_hex(char code) {
static const char hex[] = "0123456789abcdef";
return hex[code & 15];
}
static char from_hex(char ch) {
return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
}
/* Note -- caller must free returned pointer! */
static char *url_encode(char *str) {
char *pstr = str, *buf = malloc(strlen(str) * 3 + 1), *pbuf = buf;
while (*pstr) {
if (isalnum(*pstr) || *pstr == '-' || *pstr == '_' || *pstr == '.' || *pstr == '~')
*pbuf++ = *pstr;
else if (*pstr == ' ')
*pbuf++ = '+';
else
*pbuf++ = '%', *pbuf++ = to_hex(*pstr >> 4), *pbuf++ = to_hex(*pstr & 15);
pstr++;
}
*pbuf = '\0';
return buf;
}
static char *url_decode(char *str) {
char *pstr = str, *buf = malloc(strlen(str) + 1), *pbuf = buf;
while (*pstr) {
if (*pstr == '%') {
if (pstr[1] && pstr[2]) {
*pbuf++ = from_hex(pstr[1]) << 4 | from_hex(pstr[2]);
pstr += 2;
}
} else if (*pstr == '+') {
*pbuf++ = ' ';
} else {
*pbuf++ = *pstr;
}
pstr++;
}
*pbuf = '\0';
return buf;
}
/* And now back to our regularly-scheduled programming */
static int print_scan_output(struct libusb_device *device,
struct libusb_device_descriptor *desc,
char *prefix, char *manuf2,
int found, int match,
int scan_only, char *match_serno,
struct dyesub_backend *backend)
{
struct libusb_device_handle *dev;
char buf[256];
char *product = NULL, *serial = NULL, *manuf = NULL, *descr = NULL;
int dlen = 0;
struct deviceid_dict dict[MAX_DICT];
char *ieee_id;
if (libusb_open(device, &dev)) {
ERROR("Could not open device %04x:%04x (need to be root?)\n", desc->idVendor, desc->idProduct);
found = -1;
goto abort;
}
ieee_id = get_device_id(dev);
/* Get IEEE1284 info */
dlen = parse1284_data(ieee_id, dict);
/* Look up mfg string. */
if (manuf2 && strlen(manuf2)) {
manuf = url_encode(manuf2); /* Backend supplied */
} else if ((manuf = dict_find("MANUFACTURER", dlen, dict))) {
manuf = url_encode(manuf);
} else if ((manuf = dict_find("MFG", dlen, dict))) {
manuf = url_encode(manuf);
} else if ((manuf = dict_find("MFR", dlen, dict))) {
manuf = url_encode(manuf);
} else if (desc->iManufacturer) { /* Get from USB descriptor */
buf[0] = 0;
libusb_get_string_descriptor_ascii(dev, desc->iManufacturer, (unsigned char*)buf, STR_LEN_MAX);
sanitize_string(buf);
manuf = url_encode(buf);
}
if (!manuf || !strlen(manuf)) { /* Last-ditch */
if (manuf) free(manuf);
manuf = url_encode("Unknown");
}
/* Look up model number */
if ((product = dict_find("MODEL", dlen, dict))) {
product = url_encode(product);
} else if ((product = dict_find("MDL", dlen, dict))) {
product = url_encode(product);
} else if (desc->iProduct) { /* Get from USB descriptor */
buf[0] = 0;
libusb_get_string_descriptor_ascii(dev, desc->iProduct, (unsigned char*)buf, STR_LEN_MAX);
sanitize_string(buf);
product = url_encode(buf);
}
if (!product || !strlen(product)) { /* Last-ditch */
if (!product) free(product);
product = url_encode("Unknown");
}
/* Look up description */
if ((descr = dict_find("DESCRIPTION", dlen, dict))) {
descr = strdup(descr);
} else if ((descr = dict_find("DES", dlen, dict))) {
descr = strdup(descr);
}
if (!descr || !strlen(descr)) { /* Last-ditch, generate */
char *product2 = url_decode(product);
char *manuf3 = url_decode(manuf);
descr = malloc(256);
sprintf(descr, "%s %s", manuf3, product2);
free(product2);
free(manuf3);
}
/* Look up serial number */
if ((serial = dict_find("SERIALNUMBER", dlen, dict))) {
serial = url_encode(serial);
} else if ((serial = dict_find("SN", dlen, dict))) {
serial = url_encode(serial);
} else if ((serial = dict_find("SER", dlen, dict))) {
serial = url_encode(serial);
} else if ((serial = dict_find("SERN", dlen, dict))) {
serial = url_encode(serial);
} else if (desc->iSerialNumber) { /* Get from USB descriptor */
libusb_get_string_descriptor_ascii(dev, desc->iSerialNumber, (unsigned char*)buf, STR_LEN_MAX);
sanitize_string(buf);
serial = url_encode(buf);
} else if (backend->query_serno) { /* Get from backend hook */
int iface = 0;
struct libusb_config_descriptor *config;
if (libusb_kernel_driver_active(dev, iface))
libusb_detach_kernel_driver(dev, iface);
/* If we fail to claim the printer, it's already in use
so we should just skip over it... */
buf[0] = 0;
if (!libusb_claim_interface(dev, iface)) {
int i;
uint8_t endp_up, endp_down;
libusb_get_active_config_descriptor(device, &config);
for (i = 0 ; i < config->interface[0].altsetting[0].bNumEndpoints ; i++) {
if ((config->interface[0].altsetting[0].endpoint[i].bmAttributes & 3) == LIBUSB_TRANSFER_TYPE_BULK) {
if (config->interface[0].altsetting[0].endpoint[i].bEndpointAddress & LIBUSB_ENDPOINT_IN)
endp_up = config->interface[0].altsetting[0].endpoint[i].bEndpointAddress;
else
endp_down = config->interface[0].altsetting[0].endpoint[i].bEndpointAddress;
}
}
/* Ignore result since a failure isn't critical here */
backend->query_serno(dev, endp_up, endp_down, buf, STR_LEN_MAX);
libusb_release_interface(dev, iface);
}
serial = url_encode(buf);
}
if (!serial || !strlen(serial)) { /* Last-ditch */
if (serial) free(serial);
WARNING("**** THIS PRINTER DOES NOT REPORT A SERIAL NUMBER!\n");
WARNING("**** If you intend to use multiple printers of this type, you\n");
WARNING("**** must only plug one in at a time or unexpected behaivor will occur!\n");
serial = strdup("NONE_UNKNOWN");
}
if (dyesub_debug)
DEBUG("%sVID: %04X PID: %04X Manuf: '%s' Product: '%s' Serial: '%s'\n",
match ? "MATCH: " : "",
desc->idVendor, desc->idProduct, manuf, product, serial);
if (scan_only) {
int k = 0;
/* URLify the manuf and model strings */
strncpy(buf, manuf, sizeof(buf) - 2);
k = strlen(buf);
buf[k++] = '/';
buf[k] = 0;
strncpy(buf + k, product, sizeof(buf)-k);
fprintf(stdout, "direct %s://%s?serial=%s&backend=%s \"%s\" \"%s\" \"%s\" \"\"\n",
prefix, buf, serial, backend->uri_prefix,
descr, descr,
ieee_id? ieee_id : "");
if (ieee_id)
free(ieee_id);
}
/* If a serial number was passed down, use it. */
if (match_serno && strcmp(match_serno, (char*)serial)) {
found = -1;
}
/* Free things up */
if(serial) free(serial);
if(manuf) free(manuf);
if(product) free(product);
if(descr) free(descr);
libusb_close(dev);
abort:
/* Clean up the dictionary */
while (dlen--) {
free (dict[dlen].key);
free (dict[dlen].val);
}
return found;
}
static struct dyesub_backend *backends[] = {
&canonselphy_backend,
&kodak6800_backend,
&kodak605_backend,
&kodak1400_backend,
&shinkos2145_backend,
&updr150_backend,
&mitsu70x_backend,
&mitsu9550_backend,
&dnpds40_backend,
&cw01_backend,
NULL,
};
static int find_and_enumerate(struct libusb_context *ctx,
struct libusb_device ***list,
struct dyesub_backend *backend,
char *match_serno,
int printer_type,
int scan_only)
{
int num;
int i, j, k;
int found = -1;
/* Enumerate and find suitable device */
num = libusb_get_device_list(ctx, list);
for (i = 0 ; i < num ; i++) {
struct libusb_device_descriptor desc;
int match = 0;
libusb_get_device_descriptor((*list)[i], &desc);
for (k = 0 ; backends[k] ; k++) {
if (backend && backend != backends[k])
continue;
for (j = 0 ; backends[k]->devices[j].vid ; j++) {
if (desc.idVendor == backends[k]->devices[j].vid &&
desc.idProduct == backends[k]->devices[j].pid) {
match = 1;
if (printer_type == P_ANY ||
printer_type == backends[k]->devices[j].type)
found = i;
goto match;
}
}
}
match:
if (!match) {
if (extra_pid != -1 &&
extra_vid != -1 &&
extra_type != -1) {
if (extra_vid == desc.idVendor &&
extra_pid == desc.idProduct) {
match = 1;
if (printer_type == P_ANY ||
printer_type == extra_type)
found = i;
}
}
}
if (!match)
continue;
found = print_scan_output((*list)[i], &desc,
URI_PREFIX, backends[k]->devices[j].manuf_str,
found, (found == i),
scan_only, match_serno,
backends[k]);
if (found != -1 && !scan_only)
break;
}
return found;
}
static struct dyesub_backend *find_backend(char *uri_prefix)
{
int i;
if (!uri_prefix)
return NULL;
for (i = 0; ; i++) {
struct dyesub_backend *backend = backends[i];
if (!backend)
return NULL;
if (!strcmp(uri_prefix, backend->uri_prefix))
return backend;
}
return NULL;
}
static void print_license_blurb(void)
{
const char *license = "\n\
Copyright 2007-2015 Solomon Peachy <pizza AT shaftnet DOT org>\n\
\n\
This program is free software; you can redistribute it and/or modify it\n\
under the terms of the GNU General Public License as published by the Free\n\
Software Foundation; either version 3 of the License, or (at your option)\n\
any later version.\n\
\n\
This program is distributed in the hope that it will be useful, but\n\
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\n\
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License\n\
for more details.\n\
\n\
You should have received a copy of the GNU General Public License\n\
along with this program; if not, write to the Free Software\n\
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.\n\
\n [http://www.gnu.org/licenses/gpl-3.0.html]\n\n";
fprintf(stderr, "%s", license);
}
static void print_help(char *argv0, struct dyesub_backend *backend)
{
struct libusb_context *ctx = NULL;
struct libusb_device **list = NULL;
int i;
char *ptr = strrchr(argv0, '/');
if (ptr)
ptr++;
else
ptr = argv0;
if (!backend)
backend = find_backend(ptr);
if (!backend) {
int i;
DEBUG("CUPS Usage:\n");
DEBUG("\tDEVICE_URI=someuri %s job user title num-copies options [ filename ]\n", URI_PREFIX);
DEBUG("\n");
DEBUG("Standalone Usage:\n");
DEBUG("\t%s\n", URI_PREFIX);
DEBUG(" [ -D ] [ -G ]\n");
DEBUG(" [ -S serialnum ] [ -B backendname ] \n");
DEBUG(" [ -V extra_vid ] [ -P extra_pid ] [ -T extra_type ] \n");
DEBUG(" [ backend_specific_args ] \n");
DEBUG(" [ -d copies ] [ - | infile ] \n");
for (i = 0; ; i++) {
backend = backends[i];
if (!backend)
break;
DEBUG(" -B %s\t# %s version %s\n",
backend->uri_prefix, backend->name, backend->version);
if (backend->cmdline_usage)
backend->cmdline_usage();
}
} else {
DEBUG("Standalone %s backend version %s\n",
backend->name, backend->version);
DEBUG("\t%s\n", backend->uri_prefix);
DEBUG("\t[ -D ] [ -G ] [ -S serialnum ] \n");
DEBUG("\t[ -V extra_vid ] [ -P extra_pid ] [ -T extra_type ] \n");
if (backend->cmdline_usage)
backend->cmdline_usage();
DEBUG("\t[ -d copies ] [ infile | - ]\n");
}
i = libusb_init(&ctx);
if (i) {
ERROR("Failed to initialize libusb (%d)\n", i);
exit(CUPS_BACKEND_STOP);
}
find_and_enumerate(ctx, &list, backend, NULL, P_ANY, 1);
libusb_free_device_list(list, 1);
libusb_exit(ctx);
}
int main (int argc, char **argv)
{
struct libusb_context *ctx = NULL;
struct libusb_device **list = NULL;
struct libusb_device_handle *dev;
struct libusb_config_descriptor *config;
struct dyesub_backend *backend = NULL;
void * backend_ctx = NULL;
uint8_t endp_up = 0;
uint8_t endp_down = 0;
int data_fd = fileno(stdin);
int i;
int claimed;
int backend_cmd = 0;
int ret = CUPS_BACKEND_OK;
int iface = 0;
int found = -1;
int copies = 1;
int jobid = 0;
int pages = 0;
char *uri;
char *fname = NULL;
int printer_type = P_ANY;
DEBUG("Multi-Call Dye-sublimation CUPS Backend version %s\n",
BACKEND_VERSION);
DEBUG("Copyright 2007-2015 Solomon Peachy\n");
DEBUG("This free software comes with ABSOLUTELY NO WARRANTY! \n");
DEBUG("Licensed under the GNU GPL. Run with '-G' for more details.\n");
DEBUG("\n");
/* First pass at cmdline parsing */
if (getenv("DYESUB_DEBUG"))
dyesub_debug++;
if (getenv("EXTRA_PID"))
extra_pid = strtol(getenv("EXTRA_PID"), NULL, 16);
if (getenv("EXTRA_VID"))
extra_pid = strtol(getenv("EXTRA_VID"), NULL, 16);
if (getenv("EXTRA_PID"))
extra_type = atoi(getenv("EXTRA_TYPE"));
if (getenv("BACKEND"))
backend = find_backend(getenv("BACKEND"));
use_serno = getenv("DEVICE");
uri = getenv("DEVICE_URI"); /* For CUPS */
/* Try to ensure we have a sane backend for standalone mode.
CUPS mode uses 'uri' later on. */
if (!backend) {
char *ptr = strrchr(argv[0], '/');
if (ptr)
ptr++;
else
ptr = argv[0];
backend = find_backend(ptr);
}
/* Reset arg parsing */
optind = 1;
opterr = 0;
while ((i = getopt(argc, argv, "B:d:DGhP:S:T:V:")) >= 0) {
switch(i) {
case 'B':
backend = find_backend(optarg);
if (!backend) {
fprintf(stderr, "ERROR: Unknown backend '%s'\n", optarg);
}
break;
case 'd':
copies = atoi(optarg);
break;
case 'D':
dyesub_debug++;
break;
case 'G':
print_license_blurb();
exit(0);
case 'h':
print_help(argv[0], backend);
exit(0);
break;
case 'P':
extra_pid = strtol(optarg, NULL, 16);
break;
case 'S':
use_serno = optarg;
break;
case 'T':
extra_type = atoi(optarg);
break;
case 'V':
extra_pid = strtol(optarg, NULL, 16);
break;
case '?':
default: {
/* Check to see if it is claimed by the backend */
if (backend && backend->cmdline_arg) {
int keep = optind;
backend_cmd += backend->cmdline_arg(NULL, argc, argv);
optind = keep;
}
break;
}
}
}
#ifndef LIBUSB_PRE_1_0_10
if (dyesub_debug) {
const struct libusb_version *ver;
ver = libusb_get_version();
DEBUG(" ** running with libusb %d.%d.%d%s (%d)\n",
ver->major, ver->minor, ver->micro, (ver->rc? ver->rc : ""), ver->nano );
}
#endif
/* Make sure a filename was specified */
if (!backend_cmd && (optind == argc || !argv[optind])) {
print_help(argv[0], backend);
exit(0);
}
/* Are we running as a CUPS backend? */
if (uri) {
int base = optind; // XXX aka 1.
fname = argv[base + 5];
if (argv[base])
jobid = atoi(argv[base]);
if (argv[base + 3])
copies = atoi(argv[base + 3]);
if (fname) { /* IOW, is it specified? */
data_fd = open(fname, O_RDONLY);
if (data_fd < 0) {
perror("ERROR:Can't open input file");
exit(1);
}
} else {
fname = "-";
}
/* Ensure we're using BLOCKING I/O */
i = fcntl(data_fd, F_GETFL, 0);
if (i < 0) {
perror("ERROR:Can't open input");
exit(1);
}
i &= ~O_NONBLOCK;
i = fcntl(data_fd, F_SETFL, 0);
if (i < 0) {
perror("ERROR:Can't open input");
exit(1);
}
/* Figure out backend based on URI */
{
char *ptr = strstr (uri, "backend="), *ptr2;
if (!ptr) {
ERROR("Invalid URI prefix (%s)\n", uri);
exit(1);
}
ptr += 8;
ptr2 = strchr(ptr, '&');
if (ptr2)
*ptr2 = 0;
backend = find_backend(ptr);
if (!backend) {
ERROR("Invalid backend (%s)\n", ptr);
exit(1);
}
if (ptr2)
*ptr2 = '&';
}
use_serno = strchr(uri, '=');
if (!use_serno || !*(use_serno+1)) {
ERROR("Invalid URI (%s)\n", uri);
exit(1);
}
use_serno++;
{
char *ptr = strchr(use_serno, '&');
if (ptr)
*ptr = 0;
}
} else {
srand(getpid());
jobid = rand();
/* Grab the filename */
fname = argv[optind];
if (!fname && !backend_cmd) {
perror("ERROR:No input file");
exit(1);
}
if (fname) {
/* Open Input File */
if (strcmp("-", fname)) {
data_fd = open(fname, O_RDONLY);
if (data_fd < 0) {
perror("ERROR:Can't open input file");
exit(1);
}
}
}
}
/* Ignore SIGPIPE */
signal(SIGPIPE, SIG_IGN);
signal(SIGTERM, sigterm_handler);
/* Initialize backend */
DEBUG("Initializing '%s' backend (version %s)\n",
backend->name, backend->version);
backend_ctx = backend->init();
/* Parse printjob if necessary */
if (fname && backend->early_parse) {
printer_type = backend->early_parse(backend_ctx, data_fd);
if (printer_type < 0) {
ret = CUPS_BACKEND_CANCEL;
goto done;
}
}
/* Libusb setup */
ret = libusb_init(&ctx);
if (ret) {
ERROR("Failed to initialize libusb (%d)\n", ret);
ret = CUPS_BACKEND_STOP;
goto done;
}
/* Enumerate devices */
found = find_and_enumerate(ctx, &list, backend, use_serno, printer_type, 0);
#if 1
if (found == -1) {
ERROR("Printer open failure (No suitable printers found!)\n");
ret = CUPS_BACKEND_HOLD;
goto done;
}
ret = libusb_open(list[found], &dev);
if (ret) {
ERROR("Printer open failure (Need to be root?) (%d)\n", ret);
ret = CUPS_BACKEND_STOP;
goto done;
}
claimed = libusb_kernel_driver_active(dev, iface);
if (claimed) {
ret = libusb_detach_kernel_driver(dev, iface);
if (ret) {
ERROR("Printer open failure (Could not detach printer from kernel) (%d)\n", ret);
ret = CUPS_BACKEND_STOP;
goto done_close;
}
}
ret = libusb_claim_interface(dev, iface);
if (ret) {
ERROR("Printer open failure (Could not claim printer interface) (%d)\n", ret);
ret = CUPS_BACKEND_STOP;
goto done_close;
}
ret = libusb_get_active_config_descriptor(list[found], &config);
if (ret) {
ERROR("Printer open failure (Could not fetch config descriptor) (%d)\n", ret);
ret = CUPS_BACKEND_STOP;
goto done_close;
}
for (i = 0 ; i < config->interface[0].altsetting[0].bNumEndpoints ; i++) {
if ((config->interface[0].altsetting[0].endpoint[i].bmAttributes & 3) == LIBUSB_TRANSFER_TYPE_BULK) {
if (config->interface[0].altsetting[0].endpoint[i].bEndpointAddress & LIBUSB_ENDPOINT_IN)
endp_up = config->interface[0].altsetting[0].endpoint[i].bEndpointAddress;
else
endp_down = config->interface[0].altsetting[0].endpoint[i].bEndpointAddress;
}
}
#endif
/* Attach backend to device */
backend->attach(backend_ctx, dev, endp_up, endp_down, jobid);
if (backend_cmd && !uri) {
if (backend->cmdline_arg(backend_ctx, argc, argv))
goto done_claimed;
if (!fname)
goto done_claimed;
}
/* Time for the main processing loop */
INFO("Printing started (%d copies)\n", copies);
newpage:
/* Do early parsing if needed for subsequent pages */
if (pages && backend->early_parse &&
backend->early_parse(backend_ctx, data_fd) < 0)
goto done_multiple;
/* Read in data */
if ((ret = backend->read_parse(backend_ctx, data_fd))) {
if (pages)
goto done_multiple;
else
goto done_claimed;
}
INFO("Printing page %d\n", ++pages);
ret = backend->main_loop(backend_ctx, copies);
if (ret)
goto done_claimed;
/* Since we have no way of telling if there's more data remaining
to be read (without actually trying to read it), always assume
multiple print jobs. */
goto newpage;
done_multiple:
close(data_fd);
/* Done printing */
INFO("All printing done (%d pages * %d copies)\n", pages, copies);
ret = CUPS_BACKEND_OK;
done_claimed:
libusb_release_interface(dev, iface);
done_close:
#if 0
if (claimed)
libusb_attach_kernel_driver(dev, iface);
#endif
libusb_close(dev);
done:
if (backend && backend_ctx)
backend->teardown(backend_ctx);
if (list)
libusb_free_device_list(list, 1);
if (ctx)
libusb_exit(ctx);
return ret;
}
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