From 9142994158d91dc8628a73c2989bebc516842f7d Mon Sep 17 00:00:00 2001
From: Paul Gardiner <paul@glidos.net>
Date: Thu, 21 Jun 2012 11:44:09 +0100
Subject: Forms: implement the ResetForm action

This fixes the problem with the test file in bug 693125, although it
doesn't make radio buttons act correctly. The file, rather than using
radio buttons, was actually using check boxes with a reset-form action
to achieve the exclusivity.
---
 pdf/pdf_form.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

(limited to 'pdf/pdf_form.c')

diff --git a/pdf/pdf_form.c b/pdf/pdf_form.c
index 511c0e66..675cefda 100644
--- a/pdf/pdf_form.c
+++ b/pdf/pdf_form.c
@@ -1317,6 +1317,51 @@ void pdf_update_appearance(pdf_document *doc, pdf_obj *obj)
 	}
 }
 
+static void reset_field(pdf_document *doc, pdf_obj *obj)
+{
+	fz_context *ctx = doc->ctx;
+
+	switch (get_field_type(doc, obj))
+	{
+	case FZ_WIDGET_TYPE_RADIOBUTTON:
+	case FZ_WIDGET_TYPE_CHECKBOX:
+		{
+			pdf_obj *name = NULL;
+
+			fz_var(name);
+			fz_try(ctx)
+			{
+				name = fz_new_name(ctx, "Off");
+				pdf_dict_puts(obj, "AS", name);
+			}
+			fz_always(ctx)
+			{
+				pdf_drop_obj(name);
+			}
+			fz_catch(ctx)
+			{
+				fz_rethrow(ctx);
+			}
+		}
+		break;
+	default:
+		{
+			pdf_obj *def_val = pdf_dict_gets(obj, "DV");
+
+			if (def_val)
+			{
+				pdf_dict_puts(obj, "V", def_val);
+			}
+			else
+			{
+				pdf_dict_dels(obj, "V");
+			}
+
+			pdf_field_mark_dirty(ctx, obj);
+		}
+	}
+}
+
 static void execute_action(pdf_document *doc, pdf_obj *obj)
 {
 	fz_context *ctx = doc->ctx;
@@ -1348,6 +1393,40 @@ static void execute_action(pdf_document *doc, pdf_obj *obj)
 				}
 			}
 		}
+		else if (!strcmp(type, "ResetForm"))
+		{
+			int flags = pdf_to_int(pdf_dict_gets(a, "Flags"));
+			pdf_obj *affected_fields = pdf_dict_gets(a, "Fields");
+			pdf_obj *all_fields = pdf_dict_getp(doc->trailer, "Root/AcroForm/Fields");
+			int i, n = pdf_array_len(all_fields);
+
+			for (i = 0; i < n; i++)
+			{
+				pdf_obj *field = pdf_array_get(all_fields, i);
+				char *name = pdf_to_str_buf(pdf_dict_gets(field, "T"));
+				int j, m = pdf_array_len(affected_fields);
+				int found = 0;
+
+				for (j = 0; j < m && !found; j++)
+				{
+					pdf_obj *tfield = pdf_array_get(affected_fields, j);
+					char *tname;
+
+					/* Elements if the array are either indirect references
+					 * to fields or field names. */
+					tname = pdf_to_str_buf(pdf_is_string(tfield) ? tfield : pdf_dict_gets(tfield, "T"));
+
+					if (!strcmp(tname, name))
+						found = 1;
+				}
+
+				if (flags & 1)
+					found = !found;
+
+				if (found)
+					reset_field(doc, field);
+			}
+		}
 
 		a = pdf_dict_gets(a, "Next");
 	}
-- 
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