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sane-project-backends/backend/escl/escl_status.c

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9.4 KiB
C
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/* sane - Scanner Access Now Easy.
Copyright (C) 2019 Touboul Nathane
Copyright (C) 2019 Thierry HUCHARD <thierry@ordissimo.com>
This file is part of the SANE package.
SANE 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.
SANE 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 sane; see the file COPYING.
If not, see <https://www.gnu.org/licenses/>.
This file implements a SANE backend for eSCL scanners. */
#define DEBUG_DECLARE_ONLY
#include "../include/sane/config.h"
#include "escl.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libxml/parser.h>
struct idle
{
char *memory;
size_t size;
};
/**
* \fn static size_t memory_callback_s(void *contents, size_t size, size_t nmemb, void *userp)
* \brief Callback function that stocks in memory the content of the scanner status.
*
* \return realsize (size of the content needed -> the scanner status)
*/
static size_t
memory_callback_s(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct idle *mem = (struct idle *)userp;
char *str = realloc(mem->memory, mem->size + realsize + 1);
if (str == NULL) {
DBG(1, "not enough memory (realloc returned NULL)\n");
return (0);
}
mem->memory = str;
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size = mem->size + realsize;
mem->memory[mem->size] = 0;
return (realsize);
}
/**
* \fn static int find_nodes_s(xmlNode *node)
* \brief Function that browses the xml file and parses it, to find the xml children node.
* --> to recover the scanner status.
*
* \return 0 if a xml child node is found, 1 otherwise
*/
static int
find_nodes_s(xmlNode *node)
{
xmlNode *child = node->children;
while (child) {
if (child->type == XML_ELEMENT_NODE)
return (0);
child = child->next;
}
return (1);
}
static void
print_xml_job_status(xmlNode *node,
SANE_Status *job,
int *image)
{
while (node) {
if (node->type == XML_ELEMENT_NODE) {
if (find_nodes_s(node)) {
if (strcmp((const char *)node->name, "JobState") == 0) {
const char *state = (const char *)xmlNodeGetContent(node);
if (!strcmp(state, "Processing")) {
*job = SANE_STATUS_DEVICE_BUSY;
DBG(10, "jobId Processing SANE_STATUS_DEVICE_BUSY\n");
}
else if (!strcmp(state, "Completed")) {
*job = SANE_STATUS_GOOD;
DBG(10, "jobId Completed SANE_STATUS_GOOD\n");
}
else if (strcmp((const char *)node->name, "ImagesToTransfer") == 0) {
const char *state = (const char *)xmlNodeGetContent(node);
*image = atoi(state);
}
}
}
}
print_xml_job_status(node->children, job, image);
node = node->next;
}
}
static void
print_xml_platen_and_adf_status(xmlNode *node,
SANE_Status *platen,
SANE_Status *adf,
const char* jobId,
SANE_Status *job,
int *image)
{
while (node) {
if (node->type == XML_ELEMENT_NODE) {
if (find_nodes_s(node)) {
if (strcmp((const char *)node->name, "State") == 0) {
DBG(10, "State\t");
const char *state = (const char *)xmlNodeGetContent(node);
if (!strcmp(state, "Idle")) {
DBG(10, "Idle SANE_STATUS_GOOD\n");
*platen = SANE_STATUS_GOOD;
} else if (!strcmp(state, "Processing")) {
DBG(10, "Processing SANE_STATUS_DEVICE_BUSY\n");
*platen = SANE_STATUS_DEVICE_BUSY;
} else {
DBG(10, "%s SANE_STATUS_UNSUPPORTED\n", state);
*platen = SANE_STATUS_UNSUPPORTED;
}
}
// Thank's Alexander Pevzner (pzz@apevzner.com)
else if (adf && strcmp((const char *)node->name, "AdfState") == 0) {
const char *state = (const char *)xmlNodeGetContent(node);
if (!strcmp(state, "ScannerAdfLoaded")){
DBG(10, "ScannerAdfLoaded SANE_STATUS_GOOD\n");
*adf = SANE_STATUS_GOOD;
} else if (!strcmp(state, "ScannerAdfJam")) {
DBG(10, "ScannerAdfJam SANE_STATUS_JAMMED\n");
*adf = SANE_STATUS_JAMMED;
} else if (!strcmp(state, "ScannerAdfDoorOpen")) {
DBG(10, "ScannerAdfDoorOpen SANE_STATUS_COVER_OPEN\n");
*adf = SANE_STATUS_COVER_OPEN;
} else if (!strcmp(state, "ScannerAdfProcessing")) {
/* Kyocera version */
DBG(10, "ScannerAdfProcessing SANE_STATUS_NO_DOC\n");
*adf = SANE_STATUS_NO_DOCS;
} else if (!strcmp(state, "ScannerAdfEmpty")) {
DBG(10, "ScannerAdfEmpty SANE_STATUS_NO_DOCS\n");
/* Cannon TR4500, EPSON XP-7100 */
*adf = SANE_STATUS_NO_DOCS;
} else {
DBG(10, "%s SANE_STATUS_NO_DOCS\n", state);
*adf = SANE_STATUS_UNSUPPORTED;
}
}
else if (jobId && job && strcmp((const char *)node->name, "JobUri") == 0) {
if (strstr((const char *)xmlNodeGetContent(node), jobId)) {
print_xml_job_status(node, job, image);
}
}
}
}
print_xml_platen_and_adf_status(node->children,
platen,
adf,
jobId,
job,
image);
node = node->next;
}
}
/**
* \fn SANE_Status escl_status(const ESCL_Device *device)
* \brief Function that finally recovers the scanner status ('Idle', or not), using curl.
* This function is called in the 'sane_open' function and it's the equivalent of
* the following curl command : "curl http(s)://'ip':'port'/eSCL/ScannerStatus".
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
escl_status(const ESCL_Device *device,
int source,
const char* jobId,
SANE_Status *job)
{
SANE_Status status = SANE_STATUS_DEVICE_BUSY;
SANE_Status platen= SANE_STATUS_DEVICE_BUSY;
SANE_Status adf= SANE_STATUS_DEVICE_BUSY;
CURL *curl_handle = NULL;
struct idle *var = NULL;
xmlDoc *data = NULL;
xmlNode *node = NULL;
const char *scanner_status = "/eSCL/ScannerStatus";
int image = -1;
int pass = 0;
reload:
if (device == NULL)
return (SANE_STATUS_NO_MEM);
status = SANE_STATUS_DEVICE_BUSY;
platen= SANE_STATUS_DEVICE_BUSY;
adf= SANE_STATUS_DEVICE_BUSY;
var = (struct idle*)calloc(1, sizeof(struct idle));
if (var == NULL)
return (SANE_STATUS_NO_MEM);
var->memory = malloc(1);
var->size = 0;
curl_handle = curl_easy_init();
escl_curl_url(curl_handle, device, scanner_status);
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, memory_callback_s);
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)var);
CURLcode res = curl_easy_perform(curl_handle);
if (res != CURLE_OK) {
DBG( 1, "The scanner didn't respond: %s\n", curl_easy_strerror(res));
status = SANE_STATUS_INVAL;
goto clean_data;
}
DBG( 10, "eSCL : Status : %s.\n", var->memory);
data = xmlReadMemory(var->memory, var->size, "file.xml", NULL, 0);
if (data == NULL) {
status = SANE_STATUS_NO_MEM;
goto clean_data;
}
node = xmlDocGetRootElement(data);
if (node == NULL) {
status = SANE_STATUS_NO_MEM;
goto clean;
}
/* Decode Job status */
// Thank's Alexander Pevzner (pzz@apevzner.com)
print_xml_platen_and_adf_status(node, &platen, &adf, jobId, job, &image);
if (platen != SANE_STATUS_GOOD &&
platen != SANE_STATUS_UNSUPPORTED) {
status = platen;
} else if (source == PLATEN) {
status = platen;
} else {
status = adf;
}
DBG (10, "STATUS : %s\n", sane_strstatus(status));
clean:
xmlFreeDoc(data);
clean_data:
xmlCleanupParser();
xmlMemoryDump();
curl_easy_cleanup(curl_handle);
free(var->memory);
free(var);
if (pass == 0 &&
source != PLATEN &&
image == 0 &&
(status == SANE_STATUS_GOOD ||
status == SANE_STATUS_UNSUPPORTED ||
status == SANE_STATUS_DEVICE_BUSY)) {
pass = 1;
goto reload;
}
return (status);
}
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