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/* $MirOS: contrib/hosted/fwcf/unwraps.c,v 1.10 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>
#ifdef DEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "defs.h"
#include "adler.h"
#include "compress.h"
#include "pack.h"
#include "sysdeps.h"
__RCSID("$MirOS: contrib/hosted/fwcf/unwraps.c,v 1.10 2006/09/26 10:25:03 tg Exp $");
char *
fwcf_unpack(int fd, size_t *inner)
{
u_int8_t c, hdrbuf[12];
size_t outer, x_inner, x, len, maxln;
char *cdata, *udata;
ADLER_DECL;
if (inner == NULL)
inner = &x_inner;
if (read(fd, hdrbuf, 12) != 12)
err(1, "read");
if (strncmp((const char *)hdrbuf, "FWCF", 4))
errx(1, "file format error");
outer = LOADT(hdrbuf + 4);
/* we don't need to support older versions, but specification
major 0 and 1 are compatible */
if (hdrbuf[7] > FWCF_VER)
errx(1, "wrong file version %02Xh", hdrbuf[7]);
*inner = LOADT(hdrbuf + 8);
c = hdrbuf[11];
maxln = ((outer + (DEF_FLASHBLOCK - 1)) / DEF_FLASHBLOCK)
* DEF_FLASHBLOCK;
if (((cdata = malloc(maxln)) == NULL) ||
((udata = malloc(*inner)) == NULL))
err(1, "malloc");
memcpy(cdata, hdrbuf, 12);
if (read(fd, cdata + 12, maxln - 12) < (ssize_t)(outer - 12))
err(1, "read");
len = outer - 4;
ADLER_CALC(cdata);
if ((s1 != LOADW(cdata + outer - 4)) ||
(s2 != LOADW(cdata + outer - 2)))
errx(1, "crc mismatch: %02X%02X%02X%02X != %04X%04X",
(u_int8_t)cdata[outer - 1], (u_int8_t)cdata[outer - 2],
(u_int8_t)cdata[outer - 3], (u_int8_t)cdata[outer - 4],
s2, s1);
if ((x = compressor_get(c)->decompress(udata, *inner, cdata + 12,
outer - 16)) != *inner)
errx(1, "size mismatch: decompressed %lu, want %lu", (unsigned long)x,
(unsigned long)*inner);
push_rndata((u_int8_t *)cdata + outer, maxln - outer);
free(cdata);
#ifdef DEBUG
fprintf(stderr, "fwcf_unpack: decompressed outer %lu inner %lu\n",
(unsigned long)outer, (unsigned long)*inner);
#endif
return (udata);
}
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