Index: work/alien_formats/altium_parser/Makefile
===================================================================
--- work/alien_formats/altium_parser/Makefile	(nonexistent)
+++ work/alien_formats/altium_parser/Makefile	(revision 35269)
@@ -0,0 +1,3 @@
+CFLAGS = -Wall -g
+
+main: main.o pcbdoc_ascii.o
Index: work/alien_formats/altium_parser/config.h
===================================================================
--- work/alien_formats/altium_parser/config.h	(nonexistent)
+++ work/alien_formats/altium_parser/config.h	(revision 35269)
@@ -0,0 +1 @@
+/* blank */
Index: work/alien_formats/altium_parser/main.c
===================================================================
--- work/alien_formats/altium_parser/main.c	(nonexistent)
+++ work/alien_formats/altium_parser/main.c	(revision 35269)
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <string.h>
+#include "pcbdoc_ascii.h"
+
+int main()
+{
+	const char *fn = "A.PcbDoc";
+	FILE *f;
+	
+	f = fopen(fn, "r");
+	if (f == NULL) {
+		fprintf(stderr, "can't open %s for read\n", fn);
+		return -1;
+	}
+
+	if (!pcbdoc_ascii_test_parse(NULL, 0, fn, f)) {
+		fprintf(stderr, "test parse says '%s' is not a PcbDoc\n", fn);
+		return -1;
+	}
+
+	return 0;
+}
\ No newline at end of file
Index: work/alien_formats/altium_parser/pcbdoc_ascii.c
===================================================================
--- work/alien_formats/altium_parser/pcbdoc_ascii.c	(nonexistent)
+++ work/alien_formats/altium_parser/pcbdoc_ascii.c	(revision 35269)
@@ -0,0 +1,55 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *
+ *  altium pcbdoc ASCII plugin - low level read: parse into a tree in mem
+ *  pcb-rnd Copyright (C) 2021 Tibor 'Igor2' Palinkas
+ *
+ *  This program 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 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ *  Contact:
+ *    Project page: http://repo.hu/projects/pcb-rnd
+ *    lead developer: http://repo.hu/projects/pcb-rnd/contact.html
+ *    mailing list: pcb-rnd (at) list.repo.hu (send "subscribe")
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#include "pcbdoc_ascii.h"
+
+int pcbdoc_ascii_test_parse(pcb_plug_io_t *ctx, pcb_plug_iot_t typ, const char *file_name, FILE *f)
+{
+	char line[256], *s;
+
+	/* first line should comply to the low level file format */
+	fgets(line, sizeof(line), f);
+
+	s = line;
+	if (*s == '|') s++;
+
+	/* every line must start with a RECORD field, the first one too */
+	if (strncmp(s,"RECORD=", 7) != 0)
+		return 0;
+
+	/* there must be a field separator */
+	if (strchr(s, '|') == NULL)
+		return 0;
+
+	return 1;
+}
Index: work/alien_formats/altium_parser/pcbdoc_ascii.h
===================================================================
--- work/alien_formats/altium_parser/pcbdoc_ascii.h	(nonexistent)
+++ work/alien_formats/altium_parser/pcbdoc_ascii.h	(revision 35269)
@@ -0,0 +1,4 @@
+#include "plug_io.h"
+
+int pcbdoc_ascii_test_parse(pcb_plug_io_t *ctx, pcb_plug_iot_t typ, const char *file_name, FILE *f);
+
Index: work/alien_formats/altium_parser/plug_io.h
===================================================================
--- work/alien_formats/altium_parser/plug_io.h	(nonexistent)
+++ work/alien_formats/altium_parser/plug_io.h	(revision 35269)
@@ -0,0 +1,7 @@
+typedef struct {
+	int dummy;
+} pcb_plug_io_t;
+
+typedef enum {
+	pcb_plug_iot_dummy
+} pcb_plug_iot_t;