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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)
- {
- uint8_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",
- (uint8_t)cdata[outer - 1], (uint8_t)cdata[outer - 2],
- (uint8_t)cdata[outer - 3], (uint8_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", (u_long)x,
- (u_long)*inner);
- push_rndata((uint8_t *)cdata + outer, maxln - outer);
- free(cdata);
- #ifdef DEBUG
- fprintf(stderr, "fwcf_unpack: decompressed outer %lu inner %lu\n",
- (u_long)outer, (u_long)*inner);
- #endif
- return (udata);
- }
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