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      1 /*	$NetBSD: fileread_ustarfs.c,v 1.3 2008/04/28 20:23:18 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifdef _STANDALONE
     33 #include <lib/libsa/stand.h>
     34 #include <lib/libkern/libkern.h>
     35 #endif
     36 
     37 #include <sys/types.h>
     38 #include <sys/param.h>
     39 #include "bootxx.h"
     40 
     41 #include <machine/sector.h>
     42 #include <machine/sbd.h>
     43 
     44 int ustar_size(const char *);
     45 
     46 int
     47 fileread(const char *fname, size_t *size)
     48 {
     49 	uint8_t *p = (void *)SDBOOT_PDINFOADDR;
     50 
     51 	if (dk_read(16, 1, p) != 0)
     52 		return BERR_TARHDR;
     53 
     54 	if (((*(uint32_t *)(p + 256)) & 0xffffff) != 0x757374)
     55 		return BERR_TARMAGIC;
     56 
     57 	*size = ustar_size((const char *)(p + 124));
     58 	if (dk_read(17, ROUND_SECTOR(*size) >> DEV_BSHIFT,
     59 	    (void *)SDBOOT_SCRATCHADDR) != 0)
     60 		return BERR_RDFILE;
     61 
     62 	return 0;
     63 }
     64 
     65 int
     66 ustar_size(const char *p)
     67 {
     68 	int i, j, k;
     69 
     70 	for (i = 0, j = 0, k = 1, p += 10; i < 11; i++, p--, k *= 8)
     71 		j += (*p - '0') * k;
     72 
     73 	return j;
     74 }
     75