1 files changed, 105 insertions, 0 deletions
diff --git a/zbar/misc.c b/zbar/misc.c
new file mode 100644
index 0000000..d4add31
--- /dev/null
+++ b/zbar/misc.c
@@ -0,0 +1,105 @@
+/*------------------------------------------------------------------------
+ *  Copyright 2012 (c) Jarek Czekalski <jarekczek@poczta.onet.pl>
+ *
+ *  This file is part of the ZBar Bar Code Reader.
+ *
+ *  The ZBar Bar Code Reader is free software; you can redistribute it
+ *  and/or modify it under the terms of the GNU Lesser Public License as
+ *  published by the Free Software Foundation; either version 2.1 of
+ *  the License, or (at your option) any later version.
+ *
+ *  The ZBar Bar Code Reader 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 Lesser Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser Public License
+ *  along with the ZBar Bar Code Reader; if not, write to the Free
+ *  Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ *  Boston, MA  02110-1301  USA
+ *
+ *  http://sourceforge.net/projects/zbar
+ *------------------------------------------------------------------------*/
+
+#include "misc.h"
+#include "error.h"
+
+static int module_initialized = 0;
+static errinfo_t err;
+
+static void module_init()
+{
+    if (module_initialized)
+	return;
+    err_init(&err, ZBAR_MOD_UNKNOWN);
+    module_initialized = 1;
+}
+
+void resolution_list_init(resolution_list_t *list)
+{
+    module_init();
+    list->cnt = 0;
+    // an empty list consists of 1 zeroed element
+    list->resolutions = calloc(1, sizeof(resolution_t));
+    if (!list->resolutions) {
+	err_capture(&err, SEV_FATAL, ZBAR_ERR_NOMEM, __func__,
+		    "allocating resources");
+    }
+}
+
+void resolution_list_cleanup(resolution_list_t *list)
+{
+    free(list->resolutions);
+}
+
+void resolution_list_add(resolution_list_t *list, resolution_t *resolution)
+{
+    list->cnt++;
+    list->resolutions =
+	realloc(list->resolutions, (list->cnt + 1) * sizeof(resolution_t));
+    if (!list->resolutions) {
+	err_capture(&err, SEV_FATAL, ZBAR_ERR_NOMEM, __func__,
+		    "allocating resources");
+    }
+    list->resolutions[list->cnt - 1] = *resolution;
+    memset(&list->resolutions[list->cnt], 0, sizeof(resolution_t));
+}
+
+void get_closest_resolution(resolution_t *resolution, resolution_list_t *list)
+{
+    resolution_t *test_res;
+    long min_diff = 0;
+    long idx_best = -1; // the index of best resolution in resolutions
+    int i	  = 0;
+    for (test_res = list->resolutions; !is_struct_null(test_res); test_res++) {
+	long diff;
+	if (resolution->cx) {
+	    diff = test_res->cx - resolution->cx;
+	    if (diff < 0)
+		diff = -diff;
+	} else {
+	    // empty resolution, looking for the biggest
+	    diff = -test_res->cx;
+	}
+	if (idx_best < 0 || diff < min_diff) {
+	    idx_best = i;
+	    min_diff = diff;
+	}
+	i++;
+    }
+
+    if (idx_best >= 0) {
+	*resolution = list->resolutions[idx_best];
+    }
+}
+
+int is_struct_null_fun(const void *pdata, const int len)
+{
+    int i;
+    for (i = 0; i < len; i++) {
+	if (((char *)pdata)[i] != 0) {
+	    return 0;
+	}
+    }
+    return 1;
+}