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airscan-device.c
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airscan-device.c
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/* AirScan (a.k.a. eSCL) backend for SANE
*
* Copyright (C) 2019 and up by Alexander Pevzner (pzz@apevzner.com)
* See LICENSE for license terms and conditions
*
* Device management
*/
#include "airscan.h"
#include <stdlib.h>
#include <string.h>
/******************** Constants *********************/
/* Max time to wait until device table is ready, in seconds
*/
#define DEVICE_TABLE_READY_TIMEOUT 5
/******************** Device management ********************/
/* Device flags
*/
enum {
DEVICE_LISTED = (1 << 0), /* Device listed in device_table */
DEVICE_READY = (1 << 1), /* Device is ready */
DEVICE_HALTED = (1 << 2), /* Device is halted */
DEVICE_INIT_WAIT = (1 << 3), /* Device was found during initial
scan and not ready yet */
DEVICE_OPENED = (1 << 4), /* Device currently opened */
DEVICE_SCANNING = (1 << 5), /* We are between sane_start() and
final sane_read() */
DEVICE_CLOSING = (1 << 6), /* Close in progress */
DEVICE_ALL_FLAGS = 0xffffffff
};
/* Device states
*/
typedef enum {
DEVICE_SCAN_IDLE,
DEVICE_SCAN_STARTED,
DEVICE_SCAN_REQUESTING,
DEVICE_SCAN_LOADING,
DEVICE_SCAN_CHECK_STATUS,
DEVICE_SCAN_CLEANING_UP,
DEVICE_SCAN_DONE
} DEVICE_STATE;
/* Device descriptor
*/
struct device {
/* Common part */
volatile gint refcnt; /* Reference counter */
const char *name; /* Device name */
unsigned int flags; /* Device flags */
devopt opt; /* Device options */
DEVICE_STATE state; /* Device state */
GCond state_cond; /* Signaled when state changes */
/* I/O handling (AVAHI and HTTP) */
zeroconf_addrinfo *addresses; /* Device addresses, NULL if
device was statically added */
zeroconf_addrinfo *addr_current; /* Current address to probe */
http_uri *uri_escl; /* eSCL base URI */
http_client *http_client; /* HTTP client */
trace *trace; /* Protocol trace */
/* Scanning state machinery */
SANE_Status job_status; /* Job completion status */
GString *job_location; /* Scanned page location */
eloop_event *job_cancel_event; /* Cancel event */
bool job_cancel_rq; /* Cancel requested */
GPtrArray *job_images; /* Array of SoupBuffer* */
unsigned int job_images_received; /* How many images received */
SANE_Word job_skip_x; /* How much pixels to skip, */
SANE_Word job_skip_y; /* from left and top */
/* Read machinery */
SANE_Bool read_non_blocking; /* Non-blocking I/O mode */
image_decoder *read_decoder_jpeg; /* JPEG decoder */
pollable *read_pollable; /* Signalled when read won't
block */
http_data *read_image; /* Current image */
SANE_Byte *read_line_buf; /* Single-line buffer */
SANE_Int read_line_num; /* Current image line 0-based */
SANE_Int read_line_end; /* If read_line_num>read_line_end
no more lines left in image */
SANE_Int read_line_off; /* Current offset in the line */
SANE_Int read_skip_lines; /* How many lines to skip */
SANE_Int read_skip_bytes; /* How many bytes to skip at line
beginning */
};
/* Static variables
*/
static GPtrArray *device_table;
static GCond device_table_cond;
/* Forward declarations
*/
static device*
device_find (const char *name);
static void
device_http_onerror (device *dev, error err);
static void
device_scanner_capabilities_callback (device *dev, http_query *q);
static void
device_probe_address (device *dev, zeroconf_addrinfo *addrinfo);
static void
device_job_set_status (device *dev, SANE_Status status);
static void
device_job_abort (device *dev, SANE_Status status);
static void
device_escl_load_page (device *dev);
static bool
device_read_push (device *dev);
static void
device_management_start_stop (bool start);
/******************** Device table management ********************/
/* Add device to the table
*/
static void
device_add (const char *name, zeroconf_addrinfo *addresses,
bool init_scan, bool statically)
{
device *dev;
/* Issue log message */
log_debug(NULL, "%s adding: \"%s\"",
statically ? "statically" : "dynamically", name);
/* Don't allow duplicate devices */
dev = device_find(name);
if (dev != NULL) {
log_debug(dev, "device already exist");
return;
}
/* Create device */
dev = g_new0(device, 1);
dev->refcnt = 1;
dev->name = g_strdup(name);
dev->flags = DEVICE_LISTED | DEVICE_INIT_WAIT;
if (init_scan) {
dev->flags |= DEVICE_INIT_WAIT;
}
devopt_init(&dev->opt);
dev->http_client = http_client_new(dev);
dev->trace = trace_open(name);
dev->job_location = g_string_new(NULL);
g_cond_init(&dev->state_cond);
dev->job_images = g_ptr_array_new();
dev->read_decoder_jpeg = image_decoder_jpeg_new();
dev->read_pollable = pollable_new();
log_debug(dev, "device created");
/* Add to the table */
g_ptr_array_add(device_table, dev);
/* Initialize device I/O */
dev->addresses = zeroconf_addrinfo_list_copy(addresses);
device_probe_address(dev, dev->addresses);
return;
}
/* Ref the device
*/
static inline device*
device_ref (device *dev)
{
g_atomic_int_inc(&dev->refcnt);
return dev;
}
/* Unref the device
*/
static inline void
device_unref (device *dev)
{
if (g_atomic_int_dec_and_test(&dev->refcnt)) {
log_debug(dev, "device destroyed");
log_assert(dev, (dev->flags & DEVICE_LISTED) == 0);
log_assert(dev, (dev->flags & DEVICE_HALTED) != 0);
log_assert(dev, (dev->flags & DEVICE_OPENED) == 0);
/* Release all memory */
g_free((void*) dev->name);
devopt_cleanup(&dev->opt);
zeroconf_addrinfo_list_free(dev->addresses);
http_uri_free(dev->uri_escl);
http_client_free(dev->http_client);
g_string_free(dev->job_location, TRUE);
g_cond_clear(&dev->state_cond);
g_ptr_array_free(dev->job_images, TRUE);
image_decoder_free(dev->read_decoder_jpeg);
pollable_free(dev->read_pollable);
g_free(dev);
}
}
/* Del device from the table. It implicitly halts all
* pending I/O activity
*
* Note, reference to the device may still exist (device
* may be opened), so memory can be freed later, when
* device is not used anymore
*/
static void
device_del (device *dev)
{
/* Remove device from table */
log_debug(dev, "removed from device table");
log_assert(dev, (dev->flags & DEVICE_LISTED) != 0);
dev->flags &= ~DEVICE_LISTED;
g_ptr_array_remove(device_table, dev);
/* Stop all pending I/O activity */
http_client_cancel(dev->http_client);
trace_close(dev->trace);
dev->trace = NULL;
dev->flags |= DEVICE_HALTED;
dev->flags &= ~DEVICE_READY;
/* Unref the device */
device_unref(dev);
}
/* Find device in a table
*/
static device*
device_find (const char *name)
{
unsigned int i;
for (i = 0; i < device_table->len; i ++) {
device *dev = g_ptr_array_index(device_table, i);
if (!strcmp(dev->name, name)) {
return dev;
}
}
return NULL;
}
/* Collect devices matching the flags. Return count of
* collected devices. If caller is only interested in
* the count, it is safe to call with out == NULL
*
* It's a caller responsibility to provide big enough
* output buffer (use device_table_size() to make a guess)
*
* Caller must own glib_main_loop lock
*/
static unsigned int
device_table_collect (unsigned int flags, device *out[])
{
unsigned int x, y = 0;
for (x = 0; x < device_table->len; x ++) {
device *dev = g_ptr_array_index(device_table, x);
if ((dev->flags & flags) != 0) {
if (out != NULL) {
out[y] = dev;
}
y ++;
}
}
return y;
}
/* Get current device_table size
*/
static unsigned int
device_table_size (void)
{
log_assert(NULL, device_table);
return device_table->len;
}
/* Purge device_table
*/
static void
device_table_purge (void)
{
size_t sz = device_table_size(), i;
device **devices = g_newa(device*, sz);
sz = device_table_collect(DEVICE_ALL_FLAGS, devices);
for (i = 0; i < sz; i ++) {
device_del(devices[i]);
}
}
/* Check if device table is ready, i.e., there is no DEVICE_INIT_WAIT
* devices
*/
static bool
device_table_ready (void)
{
return device_table_collect(DEVICE_INIT_WAIT, NULL) == 0;
}
/******************** Device state management ********************/
/* Get device state name, for debugging
*/
static inline const char*
device_state_name (DEVICE_STATE state)
{
switch (state) {
case DEVICE_SCAN_IDLE: return "SCAN_IDLE";
case DEVICE_SCAN_STARTED: return "SCAN_STARTED";
case DEVICE_SCAN_REQUESTING: return "SCAN_REQUESTING";
case DEVICE_SCAN_LOADING: return "SCAN_LOADING";
case DEVICE_SCAN_CHECK_STATUS: return "SCAN_CHECK_STATUS";
case DEVICE_SCAN_CLEANING_UP: return "SCAN_CLEANING_UP";
case DEVICE_SCAN_DONE: return "SCAN_DONE";
}
return "UNKNOWN";
}
/* Set device state
*/
static void
device_state_set (device *dev, DEVICE_STATE state)
{
if (dev->state != state) {
log_debug(dev, "state=%s", device_state_name(state));
dev->state = state;
g_cond_broadcast(&dev->state_cond);
if (dev->state == DEVICE_SCAN_DONE) {
if ((dev->flags & DEVICE_SCANNING) != 0) {
pollable_signal(dev->read_pollable);
}
}
}
}
/******************** HTTP operations ********************/
/* Initiate HTTP request
*
* If request != NULL, it becomes a request message body. The
* memory ownership will be taken by this function, assuming
* request body needs to be released with g_free() after use
*
* Content type of the outgoing requests assumed to be "text/xml"
*/
static void
device_http_perform (device *dev, const char *path,
const char *method, char *body,
void (*callback)(device*, http_query *q))
{
http_uri *uri = http_uri_new_relative(dev->uri_escl, path, true, false);
http_query_new(dev->http_client, uri, method, body, "text/xml", callback);
}
/* Initiate HTTP GET request
*/
static void
device_http_get (device *dev, const char *path,
void (*callback)(device*, http_query *q))
{
device_http_perform(dev, path, "GET", NULL, callback);
}
/* http_client onerror callback
*/
static void
device_http_onerror (device *dev, error err) {
log_debug(dev, ESTRING(err));
device_state_set(dev, DEVICE_SCAN_DONE);
device_job_set_status(dev, SANE_STATUS_IO_ERROR);
}
/******************** ESCL initialization ********************/
/* Probe next device address
*/
static void
device_probe_address (device *dev, zeroconf_addrinfo *addrinfo)
{
/* Cleanup after previous probe */
dev->addr_current = addrinfo;
if (dev->uri_escl != NULL) {
http_uri_free(dev->uri_escl);
}
/* Parse device URI */
dev->uri_escl = http_uri_new(addrinfo->uri, true);
log_assert(dev, dev->uri_escl != NULL);
/* Make sure eSCL URI's path ends with '/' character */
const char *path = http_uri_get_path(dev->uri_escl);
if (!g_str_has_suffix(path, "/")) {
size_t len = strlen(path);
char *path2 = g_alloca(len + 2);
memcpy(path2, path, len);
path2[len] = '/';
path2[len+1] = '\0';
http_uri_set_path(dev->uri_escl, path2);
}
/* Fetch device capabilities */
device_http_get(dev, "ScannerCapabilities",
device_scanner_capabilities_callback);
}
/* ScannerCapabilities fetch callback
*/
static void
device_scanner_capabilities_callback (device *dev, http_query *q)
{
error err = NULL;
/* Check request status */
err = http_query_error(q);
if (err != NULL) {
err = eloop_eprintf("ScannerCapabilities query: %s", ESTRING(err));
goto DONE;
}
/* Parse XML response */
http_data *data = http_query_get_response_data(q);
err = devopt_import_caps(&dev->opt, data->bytes, data->size);
if (err != NULL) {
err = eloop_eprintf("ScannerCapabilities: %s", err);
goto DONE;
}
devcaps_dump(dev->trace, &dev->opt.caps);
/* Cleanup and exit */
DONE:
if (err != NULL) {
log_debug(dev, ESTRING(err));
trace_error(dev->trace, err);
if (dev->addr_current != NULL && dev->addr_current->next != NULL) {
device_probe_address(dev, dev->addr_current->next);
} else {
device_del(dev);
}
} else {
dev->flags |= DEVICE_READY;
dev->flags &= ~DEVICE_INIT_WAIT;
http_client_onerror(dev->http_client, device_http_onerror);
}
g_cond_broadcast(&device_table_cond);
}
/******************** ESCL scanning ********************/
/* HTTP DELETE ${dev->job_location} callback
*/
static void
device_escl_cleanup_callback (device *dev, http_query *q)
{
(void) q;
device_state_set(dev, DEVICE_SCAN_DONE);
}
/* ESCL: cleanup after scan (delete current job)
*
* HTTP DELETE ${dev->job_location}
*/
static void
device_escl_cleanup (device *dev)
{
device_state_set(dev, DEVICE_SCAN_CLEANING_UP);
device_http_perform(dev, dev->job_location->str, "DELETE", NULL,
device_escl_cleanup_callback);
}
/* Parse ScannerStatus response.
*
* On success, returns NULL and `idle' is set to true
* if scanner is idle
*/
static error
device_escl_scannerstatus_parse (const char *xml_text, size_t xml_len,
SANE_Status *device_status, SANE_Status *adf_status)
{
error err = NULL;
xml_rd *xml;
*device_status = SANE_STATUS_GOOD;
*adf_status = SANE_STATUS_GOOD;
err = xml_rd_begin(&xml, xml_text, xml_len);
if (err != NULL) {
goto DONE;
}
if (!xml_rd_node_name_match(xml, "scan:ScannerStatus")) {
err = ERROR("XML: missed scan:ScannerStatus");
goto DONE;
}
xml_rd_enter(xml);
for (; !xml_rd_end(xml); xml_rd_next(xml)) {
if (xml_rd_node_name_match(xml, "pwg:State")) {
const char *state = xml_rd_node_value(xml);
if (!strcmp(state, "Idle")) {
*device_status = SANE_STATUS_GOOD;
}
} else if (xml_rd_node_name_match(xml, "scan:AdfState")) {
const char *state = xml_rd_node_value(xml);
if (!strcmp(state, "ScannerAdfProcessing")) {
*adf_status = SANE_STATUS_NO_DOCS;
} else if (!strcmp(state, "ScannerAdfLoaded")) {
*adf_status = SANE_STATUS_GOOD;
}
}
}
DONE:
xml_rd_finish(&xml);
return err;
}
/* HTTP GET ${dev->uri_escl}/ScannerStatus callback
*/
static void
device_escl_check_status_callback (device *dev, http_query *q)
{
error err = NULL;
SANE_Status status = SANE_STATUS_IO_ERROR, device_status, adf_status;
/* Check request status */
err = http_query_error(q);
if (err != NULL) {
err = eloop_eprintf("ScannerStatus query: %s", ESTRING(err));
goto DONE;
}
/* Parse XML response */
http_data *data = http_query_get_response_data(q);
err = device_escl_scannerstatus_parse(data->bytes, data->size,
&device_status, &adf_status);
if (err != NULL) {
err = eloop_eprintf("ScannerStatus: %s", err);
goto DONE;
}
/* Decode scanner status */
if (device_status != SANE_STATUS_GOOD) {
status = device_status;
} else if (dev->opt.src == OPT_SOURCE_PLATEN) {
status = device_status;
if (status == SANE_STATUS_GOOD) {
status = SANE_STATUS_DEVICE_BUSY;
}
} else {
status = adf_status;
if (status == SANE_STATUS_GOOD) {
status = SANE_STATUS_JAMMED;
}
}
/* Cleanup and exit */
DONE:
trace_printf(dev->trace, "-----");
if (err != NULL) {
trace_printf(dev->trace, "Error: %s", err);
}
trace_printf(dev->trace, "Device status: %s", sane_strstatus(device_status));
trace_printf(dev->trace, "ADF status: %s", sane_strstatus(adf_status));
trace_printf(dev->trace, "Job status: %s", sane_strstatus(status));
trace_printf(dev->trace, "");
device_job_set_status(dev, status);
if (dev->job_location->len == 0) {
device_state_set(dev, DEVICE_SCAN_DONE);
} else {
device_escl_cleanup(dev);
}
}
/* ESCL: check scanner status (used after failed scan request to
* clarify reasons)
*
* HTTP GET ${dev->uri_escl}/ScannerStatus
*/
static void
device_escl_check_status (device *dev)
{
device_state_set(dev, DEVICE_SCAN_CHECK_STATUS);
device_http_get(dev, "ScannerStatus",
device_escl_check_status_callback);
}
/* HTTP GET ${dev->job_location}/NextDocument callback
*/
static void
device_escl_load_page_callback (device *dev, http_query *q)
{
error err;
/* Try to fetch next page until previous page fetched successfully */
err = http_query_error(q);
if (err == NULL) {
http_data *data = http_query_get_response_data(q);
g_ptr_array_add(dev->job_images, http_data_ref(data));
dev->job_images_received ++;
if (dev->job_images_received == 1) {
if (!device_read_push(dev)) {
device_job_abort(dev, SANE_STATUS_IO_ERROR);
return;
}
}
if (dev->opt.src == OPT_SOURCE_PLATEN) {
device_escl_cleanup(dev);
} else {
device_escl_load_page(dev);
}
} else {
device_escl_check_status(dev);
}
}
/* ESCL: load next page
*
* HTTP GET ${dev->job_location}/NextDocument request
*/
static void
device_escl_load_page (device *dev)
{
size_t sz = dev->job_location->len;
if (sz == 0 || dev->job_location->str[sz-1] != '/') {
g_string_append_c(dev->job_location, '/');
}
g_string_append(dev->job_location, "NextDocument");
device_state_set(dev, DEVICE_SCAN_LOADING);
device_http_get(dev, dev->job_location->str, device_escl_load_page_callback);
g_string_truncate(dev->job_location, sz);
}
/* HTTP POST ${dev->uri_escl}/ScanJobs callback
*/
static void
device_escl_start_scan_callback (device *dev, http_query *q)
{
error err;
const char *location;
SANE_Status status = SANE_STATUS_GOOD;
http_uri *uri;
/* Check HTTP status */
err = http_query_transport_error(q);
if (err != NULL) {
err = eloop_eprintf("ScanJobs request: %s", ESTRING(err));
status = SANE_STATUS_IO_ERROR;
goto DONE;
}
if (http_query_status(q) != HTTP_STATUS_CREATED) {
err = eloop_eprintf("ScanJobs request: unexpected HTTP status %d",
http_query_status(q));
goto DONE;
}
/* Obtain location */
location = http_query_get_response_header(q, "Location");
if (location == NULL || *location == '\0') {
err = eloop_eprintf("ScanJobs request: empty location received");
status = SANE_STATUS_IO_ERROR;
goto DONE;
}
/* Validate and save location */
uri = http_uri_new_relative(dev->uri_escl, location, true, true);
if (uri == NULL) {
err = eloop_eprintf("ScanJobs request: invalid location received");
status = SANE_STATUS_IO_ERROR;
goto DONE;
}
g_string_assign(dev->job_location, http_uri_get_path(uri));
http_uri_free(uri);
/* Check for pending cancellation */
if (dev->job_cancel_rq) {
device_job_set_status(dev, SANE_STATUS_CANCELLED);
device_escl_cleanup(dev);
return;
}
/* Start loading pages */
device_escl_load_page(dev);
return;
/* Cleanup and exit */
DONE:
log_debug(dev, ESTRING(err));
trace_error(dev->trace, err);
if (status == SANE_STATUS_GOOD) {
device_escl_check_status(dev);
} else {
device_job_set_status(dev, status);
device_state_set(dev, DEVICE_SCAN_DONE);
}
}
/* Geometrical scan parameters
*/
typedef struct {
SANE_Word off; /* Requested X/Y offset, in pixels assuming 300 DPI */
SANE_Word len; /* Requested width/height, in pixels, assuming 300 DPI */
SANE_Word skip; /* Pixels to skip in returned image, in pixels assuming
actual resolution */
}
device_geom;
/*
* Computing geometrical scan parameters
*
* Input:
* tl, br - top-left, bottom-rights X/Y, in mm
* minlen, maxlen - device-defined min and max width or height,
* in pixels, assuming 300 dpi
* res - scan resolution
*
* Output:
* Filled device_geom structure
*
* Problem description.
*
* First of all, we use 3 different units to deal with geometrical
* parameters:
* 1) we communicate with frontend in millimeters
* 2) we communicate with scanner in pixels, assuming 300 DPI
* 3) when we deal with image, sizes are in pixels in real
* resolution
*
* Second, scanner returns minimal and maximal window size, but
* to simplify frontend's life, we pretend there is no such thing,
* as a minimal width or height, otherwise TL and BR ranges become
* dependent from each other. Instead, we always request image from
* scanner not smaller that scanner's minimum, and clip excessive
* image parts, if required.
*
* This all makes things non-trivial. This function handles
* this complexity
*/
static device_geom
device_geom_compute (SANE_Fixed tl, SANE_Fixed br,
SANE_Word minlen, SANE_Word maxlen, SANE_Word res)
{
device_geom geom;
geom.off = math_mm2px(tl);
geom.len = math_mm2px(br - tl);
geom.skip = 0;
minlen = math_max(minlen, 1);
geom.len = math_bound(geom.len, minlen, maxlen);
if (geom.off + geom.len > maxlen) {
geom.skip = geom.off + geom.len - maxlen;
geom.off -= geom.skip;
geom.skip = math_muldiv(geom.skip, res, 300);
}
return geom;
}
/* ESCL: start scanning
*
* HTTP POST ${dev->uri_escl}/ScanJobs
*/
static void
device_escl_start_scan (device *dev)
{
const char *source = NULL;
const char *colormode = NULL;
bool duplex = false;
const char *mime = "image/jpeg";
//const char *mime = "application/pdf";
SANE_Word x_resolution = dev->opt.resolution;
SANE_Word y_resolution = dev->opt.resolution;
devcaps_source *src = dev->opt.caps.src[dev->opt.src];
device_geom geom_x, geom_y;
char buf[64];
/* Prepare window parameters */
geom_x = device_geom_compute(dev->opt.tl_x, dev->opt.br_x,
src->min_wid_px, src->max_wid_px, x_resolution);
geom_y = device_geom_compute(dev->opt.tl_y, dev->opt.br_y,
src->min_hei_px, src->max_hei_px, y_resolution);
dev->job_skip_x = geom_x.skip;
dev->job_skip_y = geom_y.skip;
/* Prepare other parameters */
switch (dev->opt.src) {
case OPT_SOURCE_PLATEN: source = "Platen"; duplex = false; break;
case OPT_SOURCE_ADF_SIMPLEX: source = "Feeder"; duplex = false; break;
case OPT_SOURCE_ADF_DUPLEX: source = "Feeder"; duplex = true; break;
default:
log_internal_error(dev);
}
switch (dev->opt.colormode) {
case OPT_COLORMODE_COLOR: colormode = "RGB24"; break;
case OPT_COLORMODE_GRAYSCALE: colormode = "Grayscale8"; break;
case OPT_COLORMODE_LINEART: colormode = "BlackAndWhite1"; break;
default:
log_internal_error(dev);
}
/* Dump parameters */
trace_printf(dev->trace, "==============================");
trace_printf(dev->trace, "Starting scan, using the following parameters:");
trace_printf(dev->trace, " source: %s", source);
trace_printf(dev->trace, " colormode: %s", colormode);
trace_printf(dev->trace, " tl_x: %s mm",
math_fmt_mm(dev->opt.tl_x, buf));
trace_printf(dev->trace, " tl_y: %s mm",
math_fmt_mm(dev->opt.tl_y, buf));
trace_printf(dev->trace, " br_x: %s mm",
math_fmt_mm(dev->opt.br_x, buf));
trace_printf(dev->trace, " br_y: %s mm",
math_fmt_mm(dev->opt.br_y, buf));
trace_printf(dev->trace, " image size: %dx%d", geom_x.len, geom_y.len);
trace_printf(dev->trace, " image X offset: %d", geom_x.off);
trace_printf(dev->trace, " image Y offset: %d", geom_y.off);
trace_printf(dev->trace, " x_resolution: %d", x_resolution);
trace_printf(dev->trace, " y_resolution: %d", y_resolution);
trace_printf(dev->trace, " image format: %s", mime);
trace_printf(dev->trace, " duplex: %s", duplex ? "true" : "false");
trace_printf(dev->trace, "");
/* Build scan request */
xml_wr *xml = xml_wr_begin("scan:ScanSettings");
xml_wr_add_text(xml, "pwg:Version", "2.0");
xml_wr_enter(xml, "pwg:ScanRegions");
xml_wr_enter(xml, "pwg:ScanRegion");
xml_wr_add_text(xml, "pwg:ContentRegionUnits",
"escl:ThreeHundredthsOfInches");
xml_wr_add_uint(xml, "pwg:XOffset", geom_x.off);
xml_wr_add_uint(xml, "pwg:YOffset", geom_y.off);
xml_wr_add_uint(xml, "pwg:Width", geom_x.len);
xml_wr_add_uint(xml, "pwg:Height", geom_y.len);
xml_wr_leave(xml); /* pwg:ScanRegion */
xml_wr_leave(xml); /* pwg:ScanRegions */
//xml_wr_add_text(xml, "scan:InputSource", source);
xml_wr_add_text(xml, "pwg:InputSource", source);
xml_wr_add_text(xml, "scan:ColorMode", colormode);
//xml_wr_add_text(xml, "scan:DocumentFormatExt", mime);
xml_wr_add_text(xml, "pwg:DocumentFormat", mime);
xml_wr_add_uint(xml, "scan:XResolution", x_resolution);
xml_wr_add_uint(xml, "scan:YResolution", y_resolution);
if (dev->opt.src != OPT_SOURCE_PLATEN) {
xml_wr_add_bool(xml, "scan:Duplex", duplex);
}
/* Send request to device */
device_state_set(dev, DEVICE_SCAN_REQUESTING);
device_http_perform(dev, "ScanJobs", "POST", xml_wr_finish(xml),
device_escl_start_scan_callback);
}
/******************** Scan Job management ********************/
/* Set job status. If status already set, it will not be
* changed
*/
static void
device_job_set_status (device *dev, SANE_Status status)
{
if (dev->job_status == SANE_STATUS_GOOD ||
status == SANE_STATUS_CANCELLED) {
log_debug(dev, "JOB status=%s", sane_strstatus(status));
dev->job_status = status;
}
}
/* Abort the job with specified status code
*/
static void
device_job_abort (device *dev, SANE_Status status)
{
if (dev->job_cancel_rq) {
return; /* We are already working on it */
}
if (dev->state != DEVICE_SCAN_IDLE) {
log_debug(dev, "JOB aborted: %s", sane_strstatus(status));
}
switch (dev->state) {
case DEVICE_SCAN_IDLE:
case DEVICE_SCAN_DONE:
/* Nothing to do */
break;
case DEVICE_SCAN_STARTED:
case DEVICE_SCAN_REQUESTING:
dev->job_cancel_rq = true;
break;
case DEVICE_SCAN_LOADING:
case DEVICE_SCAN_CHECK_STATUS:
http_client_cancel(dev->http_client);
/* Fall through...*/
case DEVICE_SCAN_CLEANING_UP:
device_job_set_status(dev, status);
if (dev->state == DEVICE_SCAN_LOADING) {
device_escl_cleanup(dev);
}
if (dev->state != DEVICE_SCAN_CLEANING_UP) {
device_state_set(dev, DEVICE_SCAN_DONE);
}
break;
}
}
/* dev->job_cancel_event callback
*/
static void
device_job_cancel_event_callback (void *data)
{
device *dev = data;
log_debug(dev, "cancel requested");
if ((dev->flags & (DEVICE_SCANNING | DEVICE_CLOSING)) != 0) {
device_job_abort(dev, SANE_STATUS_CANCELLED);
}
}
/******************** API helpers ********************/
/* Wait until list of devices is ready
*/
static void
device_list_sync (void)
{
gint64 timeout = g_get_monotonic_time() +
DEVICE_TABLE_READY_TIMEOUT * G_TIME_SPAN_SECOND;
while ((!device_table_ready() || zeroconf_init_scan()) &&
g_get_monotonic_time() < timeout) {
eloop_cond_wait_until(&device_table_cond, timeout);
}
}
/* Compare SANE_Device*, for qsort
*/
static int
device_list_qsort_cmp (const void *p1, const void *p2)
{
return strcmp(((SANE_Device*) p1)->name, ((SANE_Device*) p2)->name);