1 files changed, 83 insertions, 0 deletions
diff --git a/package/cfgfs/src/header.c b/package/cfgfs/src/header.c
new file mode 100644
index 000000000..b3db0ce21
--- /dev/null
+++ b/package/cfgfs/src/header.c
@@ -0,0 +1,83 @@
+/* $MirOS: contrib/hosted/fwcf/header.c,v 1.7 2006/09/26 10:25:03 tg Exp $ */
+
+/*-
+ * Copyright (c) 2006
+ *	Thorsten Glaser <tg@mirbsd.de>
+ *
+ * Licensee is hereby permitted to deal in this work without restric-
+ * tion, including unlimited rights to use, publicly perform, modify,
+ * merge, distribute, sell, give away or sublicence, provided all co-
+ * pyright notices above, these terms and the disclaimer are retained
+ * in all redistributions or reproduced in accompanying documentation
+ * or other materials provided with binary redistributions.
+ *
+ * Licensor offers the work "AS IS" and WITHOUT WARRANTY of any kind,
+ * express, or implied, to the maximum extent permitted by applicable
+ * law, without malicious intent or gross negligence; in no event may
+ * licensor, an author or contributor be held liable for any indirect
+ * or other damage, or direct damage except proven a consequence of a
+ * direct error of said person and intended use of this work, loss or
+ * other issues arising in any way out of its use, even if advised of
+ * the possibility of such damage or existence of a defect.
+ */
+
+#include <sys/param.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef DEBUG_ADLER
+#include <zlib.h>
+#endif
+
+#include "defs.h"
+#include "adler.h"
+#include "pack.h"
+
+__RCSID("$MirOS: contrib/hosted/fwcf/header.c,v 1.7 2006/09/26 10:25:03 tg Exp $"
+    "\t" ADLER_H);
+
+char *
+mkheader(char *f_header, size_t hdrsize, uint32_t outer_len,
+    uint32_t inner_len, uint8_t algo)
+{
+	char *hdrptr = f_header;
+	size_t hdrleft = hdrsize;
+
+#ifdef DEBUG
+	fprintf(stderr, "header: inner=%d outer=%d\n", inner_len & 0xFFFFFF,
+	    outer_len & 0xFFFFFF);
+#endif
+
+	STOREB('F');
+	STOREB('W');
+	STOREB('C');
+	STOREB('F');
+
+	outer_len = (outer_len & 0xFFFFFF) | (FWCF_VER << 24);
+	STORED(outer_len);
+
+	inner_len = (inner_len & 0xFFFFFF) | (algo << 24);
+	STORED(inner_len);
+	return (hdrptr);
+}
+
+char *
+mktrailer(char *data, size_t len)
+{
+	char *hdrptr = data + len;
+	size_t hdrleft = 4;
+	ADLER_DECL;
+#ifdef DEBUG_ADLER
+	uint32_t adler = adler32(1, (uint8_t *)data, len);
+#endif
+
+	ADLER_CALC(data);
+#ifdef DEBUG_ADLER
+	if ((s1 != (adler & 0xFFFF)) || (s2 != (adler >> 16)))
+		errx(255, "adler32 implementation error: %04X%04X vs %08X",
+		    s2, s1, adler);
+#endif
+	STOREW(s1);
+	STOREW(s2);
+	return (data);
+}