Index: work/alien_formats/altium/pcbdoc_ascii.h
===================================================================
--- work/alien_formats/altium/pcbdoc_ascii.h	(revision 35453)
+++ work/alien_formats/altium/pcbdoc_ascii.h	(revision 35454)
@@ -6,6 +6,8 @@
 
 static inline long ucdf_fread(ucdf_file_t *fp, char *dst, long len)
 {
+	if (feof(fp))
+		return 0;
 	return fread(dst, 1, len, fp);
 }
 
Index: work/alien_formats/altium/pcbdoc_bin.c
===================================================================
--- work/alien_formats/altium/pcbdoc_bin.c	(revision 35453)
+++ work/alien_formats/altium/pcbdoc_bin.c	(revision 35454)
@@ -1,10 +1,84 @@
+#include <stdlib.h>
 #include "pcbdoc_ascii.h"
 #include "pcbdoc_bin.h"
 
+#warning remove:
+#include <stdio.h>
+
+#define MAX_REC_LEN (1UL << 20)
+
+/* convert a file integer (len bytes wide) into a native integer, assuming source is little-endian */
+static long load_int(unsigned const char *src, int len)
+{
+	int n, sh;
+	long tmp, res = 0;
+
+	for(sh = n = 0; n < len; n++,sh += 8,src++) {
+		tmp = *src;
+		tmp = (tmp << sh);
+		res |= tmp;
+	}
+
+	/* "sign extend" */
+	if (res >= (1UL << (len*8-1)))
+		res = -((1UL << (len*8)) - res);
+
+	return res;
+}
+
+#define buf_grow(tmp, len) \
+do { \
+	if (tmp->alloced < len) { \
+		free(tmp->data); \
+		tmp->data = malloc(len); \
+		if (tmp->data == NULL) { \
+			tmp->alloced = 0; \
+			return -1; \
+		} \
+		tmp->alloced = len; \
+	} \
+} while(0)
+
+static long read_rec_l4b(ucdf_file_t *fp, altium_buf_t *tmp)
+{
+	unsigned char lens[4];
+	long len, res;
+
+	if (ucdf_fread(fp, (void *)lens, 4) != 4)
+		return -1;
+
+	len = load_int(lens, 4);
+	if ((len < 0) || (len >= MAX_REC_LEN))
+		return -1;
+
+	buf_grow(tmp, len+1);
+	res = ucdf_fread(fp, (void *)tmp->data, len);
+	if (res == 0)
+		return 0;
+
+	if (res != len)
+		return -1;
+
+	tmp->data[len] = '\0'; /* safety: always make it a valid string just in case it is text */
+
+	return len;
+}
+
+static int pcbdoc_bin_parse_ascii(rnd_hidlib_t *hidlib, altium_tree_t *tree, const char *record, const char *fields)
+{
+#warning TODO
+	return 0;
+}
+
 int pcbdoc_bin_parse_board6(rnd_hidlib_t *hidlib, altium_tree_t *tree, ucdf_file_t *fp, altium_buf_t *tmp)
 {
-	
-	return -1;
+	for(;;) {
+		long len = read_rec_l4b(fp, tmp);
+		if (len <= 0)
+			return len;
+		if (pcbdoc_bin_parse_ascii(hidlib, tree, "BOARD", (char *)tmp->data) != 0)
+			return -1;
+	}
 }