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/* $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);
}
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