Index: altium/pcbdoc_bin.c
===================================================================
--- altium/pcbdoc_bin.c	(revision 35458)
+++ altium/pcbdoc_bin.c	(revision 35459)
@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <string.h>
 #include <assert.h>
 #include "pcbdoc_ascii.h"
 #include "pcbdoc_bin.h"
@@ -8,6 +9,13 @@
 
 #define MAX_REC_LEN (1UL << 20)
 
+static const union {
+	short int sh;
+	char c[2];
+} endianness = {0x0102};
+
+#define is_host_litend (endianness.c[0] == 2)
+
 /* 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)
 {
@@ -27,6 +35,24 @@
 	return res;
 }
 
+/* convert a double, assuming source is little-endian */
+static double load_dbl(unsigned const char *src)
+{
+	double d;
+
+	if (is_host_litend) { /* le to le -> copy */
+		memcpy(&d, src, 8);
+		return d;
+	}
+	else { /* le to be -> swap */
+		unsigned char tmp[8];
+		tmp[0] = src[7]; tmp[1] = src[6]; tmp[2] = src[5]; tmp[3] = src[4];
+		tmp[4] = src[3]; tmp[5] = src[2]; tmp[6] = src[1]; tmp[7] = src[0];
+		memcpy(&d, tmp, 8);
+		return d;
+	}
+}
+
 static double bmil(unsigned const char *src)
 {
 	long raw = load_int(src, 4);
@@ -141,3 +167,31 @@
 	}
 }
 
+
+int pcbdoc_bin_parse_arcs6(rnd_hidlib_t *hidlib, altium_tree_t *tree, ucdf_file_t *fp, altium_buf_t *tmp)
+{
+	for(;;) {
+		unsigned char *d;
+		int rectype;
+		long len;
+		
+		
+		len = read_rec_tlb(fp, tmp, &rectype);
+		if (len <= 0)
+			return len;
+		if (rectype != 1) {
+			rnd_message(RND_MSG_ERROR, "Arcs6 record with wrong type; expected 4, got %d\n", rectype);
+			continue;
+		}
+		if (len < 45) {
+			rnd_message(RND_MSG_ERROR, "Arcs6 record too short; expected 45, got %ld\n", len);
+			continue;
+		}
+
+		d = tmp->data;
+
+		printf("arc: layer=%d ko=%d net=%ld poly=%ld comp=%ld width=%.2f uu=%d%d\n", d[0], d[1], load_int(d+3, 2), load_int(d+5, 2), load_int(d+7, 2), bmil(d+41), d[48], d[55]);
+		printf("  cx=%.2f cy=%.2f r=%.2f sa=%.3f ea=%.3f\n", bmil(d+13), bmil(d+17), bmil(d+21), load_dbl(d+25), load_dbl(d+33));
+	}
+}
+
Index: altium/test.c
===================================================================
--- altium/test.c	(revision 35458)
+++ altium/test.c	(revision 35459)
@@ -3,7 +3,7 @@
 #include "pcbdoc_ascii.h"
 #include "pcbdoc_bin.h"
 
-int pcbdoc_bin_parse_tracks6(rnd_hidlib_t *hidlib, altium_tree_t *tree, ucdf_file_t *fp, altium_buf_t *tmp);
+int pcbdoc_bin_parse_arcs6(rnd_hidlib_t *hidlib, altium_tree_t *tree, ucdf_file_t *fp, altium_buf_t *tmp);
 
 int main(int argc, char *argv[])
 {
@@ -20,7 +20,7 @@
 		exit(1);
 	}
 
-	res = pcbdoc_bin_parse_tracks6(&hidlib, &tree, f, &tmp);
+	res = pcbdoc_bin_parse_arcs6(&hidlib, &tree, f, &tmp);
 
 	fclose(f);