1 files changed, 99 insertions, 0 deletions
diff --git a/backend/escl/escl_scan.c b/backend/escl/escl_scan.c
new file mode 100644
index 0000000..8f077a1
--- /dev/null
+++ b/backend/escl/escl_scan.c
@@ -0,0 +1,99 @@
+/* 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, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+   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 <curl/curl.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 fonction)
+ */
+static size_t
+write_callback(void *str, size_t size, size_t nmemb, void *userp)
+{
+    size_t to_write = fwrite(str, size, nmemb, (FILE *)userp);
+
+    return (to_write);
+}
+
+/**
+ * \fn SANE_Status escl_scan(capabilities_t *scanner, SANE_String_Const name, 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 __sane_unused__ *scanner, SANE_String_Const name, char *result)
+{
+    CURL *curl_handle = NULL;
+    const char *scan_jobs = "/eSCL/ScanJobs";
+    const char *scanner_start = "/NextDocument";
+    char scan_cmd[PATH_MAX] = { 0 };
+    SANE_Status status = SANE_STATUS_GOOD;
+
+    if (name == NULL)
+        return (SANE_STATUS_NO_MEM);
+    curl_handle = curl_easy_init();
+    if (curl_handle != NULL) {
+        strcpy(scan_cmd, name);
+        strcat(scan_cmd, scan_jobs);
+        strcat(scan_cmd, result);
+        strcat(scan_cmd, scanner_start);
+        curl_easy_setopt(curl_handle, CURLOPT_URL, scan_cmd);
+        DBG( 1, "Scan : %s.\n", scan_cmd);
+	if (strncmp(name, "https", 5) == 0) {
+            DBG( 1, "Ignoring safety certificates, use https\n");
+            curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYPEER, 0L);
+            curl_easy_setopt(curl_handle, CURLOPT_SSL_VERIFYHOST, 0L);
+        }
+        curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_callback);
+        scanner->tmp = tmpfile();
+        if (scanner->tmp != NULL) {
+            curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, scanner->tmp);
+            if (curl_easy_perform(curl_handle) != CURLE_OK) {
+                status = SANE_STATUS_INVAL;
+            }
+            else
+                curl_easy_cleanup(curl_handle);
+            fseek(scanner->tmp, 0, SEEK_SET);
+        }
+        else
+            status = SANE_STATUS_NO_MEM;
+    }
+    return (status);
+}