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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 "../include/sane/sanei.h"
/**
* \fn static size_t write_callback(void *str, size_t size, size_t nmemb, void *userp)
* \brief Callback function that writes the image scanned into the temporary file.
*
* \return to_write (the result of the fwrite function)
*/
static size_t
write_callback(void *str, size_t size, size_t nmemb, void *userp)
{
capabilities_t *scanner = (capabilities_t *)userp;
size_t to_write = fwrite(str, size, nmemb, scanner->tmp);
scanner->real_read += to_write;
return (to_write);
}
/**
* \fn SANE_Status escl_scan(capabilities_t *scanner, const ESCL_Device *device, char *result)
* \brief Function that, after recovering the 'new job', scans the image writed in the
* temporary file, using curl.
* This function is called in the 'sane_start' function and it's the equivalent of
* the following curl command : "curl -s http(s)://'ip:'port'/eSCL/ScanJobs/'new job'/NextDocument > image.jpg".
*
* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
*/
SANE_Status
escl_scan(capabilities_t *scanner, const ESCL_Device *device, char *scanJob, char *result)
{
CURL *curl_handle = NULL;
const char *scan_jobs = "/eSCL/";
const char *scanner_start = "/NextDocument";
char scan_cmd[PATH_MAX] = { 0 };
SANE_Status status = SANE_STATUS_GOOD;
if (device == NULL)
return (SANE_STATUS_NO_MEM);
scanner->real_read = 0;
curl_handle = curl_easy_init();
if (curl_handle != NULL) {
snprintf(scan_cmd, sizeof(scan_cmd), "%s%s%s%s",
scan_jobs, scanJob, result, scanner_start);
escl_curl_url(curl_handle, device, scan_cmd);
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_callback);
curl_easy_setopt(curl_handle, CURLOPT_FOLLOWLOCATION, 1L);
curl_easy_setopt(curl_handle, CURLOPT_MAXREDIRS, 3L);
if (scanner->tmp)
fclose(scanner->tmp);
scanner->tmp = tmpfile();
if (scanner->tmp != NULL) {
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, scanner);
CURLcode res = curl_easy_perform(curl_handle);
if (res != CURLE_OK) {
DBG( 1, "Unable to scan: %s\n", curl_easy_strerror(res));
fclose(scanner->tmp);
scanner->tmp = NULL;
status = SANE_STATUS_INVAL;
goto cleanup;
}
fseek(scanner->tmp, 0, SEEK_SET);
}
else
status = SANE_STATUS_NO_MEM;
cleanup:
curl_easy_cleanup(curl_handle);
}
DBG(10, "eSCL scan : [%s]\treal read (%ld)\n", sane_strstatus(status), scanner->real_read);
if (scanner->real_read == 0)
{
fclose(scanner->tmp);
scanner->tmp = NULL;
return SANE_STATUS_NO_DOCS;
}
return (status);
}
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