kopia lustrzana https://gitlab.com/sane-project/backends
261 wiersze
9.9 KiB
C
261 wiersze
9.9 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. If not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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 <curl/curl.h>
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#ifdef PATH_MAX
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# undef PATH_MAX
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#endif
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#define PATH_MAX 4096
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struct uploading
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{
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const char *read_data;
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size_t size;
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};
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struct downloading
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{
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char *memory;
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size_t size;
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};
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static const char settings[] =
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"<?xml version=\"1.0\" encoding=\"UTF-8\"?>" \
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"<scan:ScanSettings xmlns:pwg=\"http://www.pwg.org/schemas/2010/12/sm\" xmlns:scan=\"http://schemas.hp.com/imaging/escl/2011/05/03\">" \
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" <pwg:Version>2.0</pwg:Version>" \
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" <pwg:ScanRegions>" \
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" <pwg:ScanRegion>" \
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" <pwg:ContentRegionUnits>escl:ThreeHundredthsOfInches</pwg:ContentRegionUnits>" \
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" <pwg:Height>%d</pwg:Height>" \
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" <pwg:Width>%d</pwg:Width>" \
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" <pwg:XOffset>%d</pwg:XOffset>" \
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" <pwg:YOffset>%d</pwg:YOffset>" \
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" </pwg:ScanRegion>" \
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" </pwg:ScanRegions>" \
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" <pwg:DocumentFormat>%s</pwg:DocumentFormat>" \
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"%s" \
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" <scan:ColorMode>%s</scan:ColorMode>" \
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" <scan:XResolution>%d</scan:XResolution>" \
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" <scan:YResolution>%d</scan:YResolution>" \
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" <pwg:InputSource>%s</pwg:InputSource>" \
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" <scan:InputSource>%s</scan:InputSource>" \
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"%s" \
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"</scan:ScanSettings>";
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/**
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* \fn static size_t download_callback(void *str, size_t size, size_t nmemb, void *userp)
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* \brief Callback function that stocks in memory the content of the 'job'. Example below :
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* "Trying 192.168.14.150...
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* TCP_NODELAY set
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* Connected to 192.168.14.150 (192.168.14.150) port 80
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* POST /eSCL/ScanJobs HTTP/1.1
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* Host: 192.168.14.150
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* User-Agent: curl/7.55.1
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* Accept: /
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* Content-Length: 605
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* Content-Type: application/x-www-form-urlencoded
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* upload completely sent off: 605 out of 605 bytes
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* < HTTP/1.1 201 Created
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* < MIME-Version: 1.0
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* < Location: http://192.168.14.150/eSCL/ScanJobs/22b54fd0-027b-1000-9bd0-f4a99726e2fa
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* < Content-Length: 0
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* < Connection: close
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* <
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* Closing connection 0"
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*
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* \return realsize (size of the content needed -> the 'job')
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*/
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static size_t
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download_callback(void *str, size_t size, size_t nmemb, void *userp)
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{
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struct downloading *download = (struct downloading *)userp;
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size_t realsize = size * nmemb;
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char *content = realloc(download->memory, download->size + realsize + 1);
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if (content == NULL) {
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DBG( 1, "Not enough memory (realloc returned NULL)\n");
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return (0);
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}
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download->memory = content;
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memcpy(&(download->memory[download->size]), str, realsize);
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download->size = download->size + realsize;
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download->memory[download->size] = 0;
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return (realsize);
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}
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/**
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* \fn char *escl_newjob (capabilities_t *scanner, const ESCL_Device *device, SANE_Status *status)
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* \brief Function that, using curl, uploads the data (composed by the scanner capabilities) to the
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* server to download the 'job' and recover the 'new job' (char *result), in LOCATION.
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* This function is called in the 'sane_start' function and it's the equivalent of the
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* following curl command : "curl -v POST -d cap.xml http(s)://'ip':'port'/eSCL/ScanJobs".
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*
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* \return result (the 'new job', situated in LOCATION)
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*/
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char *
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escl_newjob (capabilities_t *scanner, const ESCL_Device *device, SANE_Status *status)
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{
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CURL *curl_handle = NULL;
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int off_x = 0, off_y = 0;
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struct uploading *upload = NULL;
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struct downloading *download = NULL;
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const char *scan_jobs = "/eSCL/ScanJobs";
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char cap_data[PATH_MAX] = { 0 };
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char *location = NULL;
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char *result = NULL;
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char *temporary = NULL;
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char *f_ext = "";
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char *format_ext = NULL;
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char duplex_mode[1024] = { 0 };
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*status = SANE_STATUS_GOOD;
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if (device == NULL || scanner == NULL) {
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*status = SANE_STATUS_NO_MEM;
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DBG( 1, "Create NewJob : the name or the scan are invalid.\n");
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return (NULL);
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}
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upload = (struct uploading *)calloc(1, sizeof(struct uploading));
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if (upload == NULL) {
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*status = SANE_STATUS_NO_MEM;
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DBG( 1, "Create NewJob : memory allocation failure\n");
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return (NULL);
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}
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download = (struct downloading *)calloc(1, sizeof(struct downloading));
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if (download == NULL) {
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free(upload);
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DBG( 1, "Create NewJob : memory allocation failure\n");
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*status = SANE_STATUS_NO_MEM;
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return (NULL);
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}
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curl_handle = curl_easy_init();
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if (scanner->caps[scanner->source].format_ext == 1)
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{
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char f_ext_tmp[1024];
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snprintf(f_ext_tmp, sizeof(f_ext_tmp),
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" <scan:DocumentFormatExt>%s</scan:DocumentFormatExt>",
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scanner->caps[scanner->source].default_format);
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format_ext = f_ext_tmp;
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}
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else
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format_ext = f_ext;
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if(scanner->source > PLATEN && scanner->Sources[ADFDUPLEX]) {
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snprintf(duplex_mode, sizeof(duplex_mode),
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" <scan:Duplex>%s</scan:Duplex>",
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scanner->source == ADFDUPLEX ? "true" : "false");
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}
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DBG( 1, "Create NewJob : %s\n", scanner->caps[scanner->source].default_format);
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if (scanner->caps[scanner->source].pos_x > scanner->caps[scanner->source].width)
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off_x = (scanner->caps[scanner->source].pos_x > scanner->caps[scanner->source].width) / 2;
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if (scanner->caps[scanner->source].pos_y > scanner->caps[scanner->source].height)
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off_y = (scanner->caps[scanner->source].pos_y > scanner->caps[scanner->source].height) / 2;
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if (curl_handle != NULL) {
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char *source = (scanner->source == PLATEN ? "Platen" : "Feeder");
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snprintf(cap_data, sizeof(cap_data), settings,
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scanner->caps[scanner->source].height,
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scanner->caps[scanner->source].width,
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off_x,
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off_y,
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scanner->caps[scanner->source].default_format,
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format_ext,
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scanner->caps[scanner->source].default_color,
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scanner->caps[scanner->source].default_resolution,
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scanner->caps[scanner->source].default_resolution,
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source,
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source,
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duplex_mode[0] == 0 ? "" : duplex_mode);
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DBG( 1, "Create NewJob : %s\n", cap_data);
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upload->read_data = strdup(cap_data);
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upload->size = strlen(cap_data);
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download->memory = malloc(1);
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download->size = 0;
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escl_curl_url(curl_handle, device, scan_jobs);
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curl_easy_setopt(curl_handle, CURLOPT_POST, 1L);
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curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, upload->read_data);
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curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDSIZE, upload->size);
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curl_easy_setopt(curl_handle, CURLOPT_HEADERFUNCTION, download_callback);
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curl_easy_setopt(curl_handle, CURLOPT_HEADERDATA, (void *)download);
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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, "Create NewJob : the scanner responded incorrectly: %s\n", curl_easy_strerror(res));
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*status = SANE_STATUS_INVAL;
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}
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else {
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if (download->memory != NULL) {
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char *tmp_location = strstr(download->memory, "Location:");
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if (tmp_location) {
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temporary = strchr(tmp_location, '\r');
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if (temporary == NULL)
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temporary = strchr(tmp_location, '\n');
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if (temporary != NULL) {
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*temporary = '\0';
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location = strrchr(tmp_location,'/');
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if (location) {
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result = strdup(location);
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DBG( 1, "Create NewJob : %s\n", result);
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*temporary = '\n';
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}
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}
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if (result == NULL) {
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DBG( 1, "Error : Create NewJob, no location: %s\n", download->memory);
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*status = SANE_STATUS_INVAL;
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}
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free(download->memory);
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}
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else {
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DBG( 1, "Create NewJob : The creation of the failed job: %s\n", download->memory);
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// If "409 Conflict" appear it means that there is no paper in feeder
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if (strstr(download->memory, "409 Conflict") != NULL)
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*status = SANE_STATUS_NO_DOCS;
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// If "503 Service Unavailable" appear, it means that device is busy (scanning in progress)
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else if (strstr(download->memory, "503 Service Unavailable") != NULL)
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*status = SANE_STATUS_DEVICE_BUSY;
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else
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*status = SANE_STATUS_INVAL;
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}
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}
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else {
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*status = SANE_STATUS_NO_MEM;
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DBG( 1, "Create NewJob : The creation of the failed job\n");
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return (NULL);
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}
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}
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curl_easy_cleanup(curl_handle);
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}
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if (upload != NULL)
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free(upload);
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if (download != NULL)
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free(download);
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return (result);
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}
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