kopia lustrzana https://gitlab.com/sane-project/backends
109 wiersze
3.8 KiB
C
109 wiersze
3.8 KiB
C
/* sane - Scanner Access Now Easy.
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Copyright (C) 2019 Touboul Nathane
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Copyright (C) 2019 Thierry HUCHARD <thierry@ordissimo.com>
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This file is part of the SANE package.
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SANE is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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SANE is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with sane; see the file COPYING.
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If not, see <https://www.gnu.org/licenses/>.
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This file implements a SANE backend for eSCL scanners. */
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#define DEBUG_DECLARE_ONLY
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#include "../include/sane/config.h"
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#include "escl.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../include/sane/sanei.h"
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/**
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* \fn static size_t write_callback(void *str, size_t size, size_t nmemb, void *userp)
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* \brief Callback function that writes the image scanned into the temporary file.
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*
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* \return to_write (the result of the fwrite function)
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*/
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static size_t
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write_callback(void *str, size_t size, size_t nmemb, void *userp)
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{
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capabilities_t *scanner = (capabilities_t *)userp;
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size_t to_write = fwrite(str, size, nmemb, scanner->tmp);
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scanner->real_read += to_write;
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return (to_write);
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}
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/**
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* \fn SANE_Status escl_scan(capabilities_t *scanner, const ESCL_Device *device, char *result)
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* \brief Function that, after recovering the 'new job', scans the image writed in the
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* temporary file, using curl.
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* This function is called in the 'sane_start' function and it's the equivalent of
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* the following curl command : "curl -s http(s)://'ip:'port'/eSCL/ScanJobs/'new job'/NextDocument > image.jpg".
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*
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* \return status (if everything is OK, status = SANE_STATUS_GOOD, otherwise, SANE_STATUS_NO_MEM/SANE_STATUS_INVAL)
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*/
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SANE_Status
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escl_scan(capabilities_t *scanner, const ESCL_Device *device, char *scanJob, char *result)
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{
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CURL *curl_handle = NULL;
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const char *scan_jobs = "/eSCL/";
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const char *scanner_start = "/NextDocument";
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char scan_cmd[PATH_MAX] = { 0 };
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SANE_Status status = SANE_STATUS_GOOD;
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if (device == NULL)
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return (SANE_STATUS_NO_MEM);
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scanner->real_read = 0;
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curl_handle = curl_easy_init();
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if (curl_handle != NULL) {
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snprintf(scan_cmd, sizeof(scan_cmd), "%s%s%s%s",
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scan_jobs, scanJob, result, scanner_start);
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escl_curl_url(curl_handle, device, scan_cmd);
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curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_callback);
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curl_easy_setopt(curl_handle, CURLOPT_FOLLOWLOCATION, 1L);
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curl_easy_setopt(curl_handle, CURLOPT_MAXREDIRS, 3L);
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if (scanner->tmp)
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fclose(scanner->tmp);
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scanner->tmp = tmpfile();
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if (scanner->tmp != NULL) {
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curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, scanner);
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CURLcode res = curl_easy_perform(curl_handle);
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if (res != CURLE_OK) {
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DBG( 1, "Unable to scan: %s\n", curl_easy_strerror(res));
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scanner->real_read = 0;
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fclose(scanner->tmp);
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scanner->tmp = NULL;
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status = SANE_STATUS_INVAL;
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goto cleanup;
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}
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fseek(scanner->tmp, 0, SEEK_SET);
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}
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else
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status = SANE_STATUS_NO_MEM;
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cleanup:
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curl_easy_cleanup(curl_handle);
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}
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DBG(10, "eSCL scan : [%s]\treal read (%ld)\n", sane_strstatus(status), scanner->real_read);
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if (scanner->real_read == 0)
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{
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fclose(scanner->tmp);
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scanner->tmp = NULL;
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return SANE_STATUS_NO_DOCS;
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}
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return (status);
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}
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