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fileread_ustarfs.c revision 1.1 
      1 /*	$NetBSD: fileread_ustarfs.c,v 1.1 2005/12/29 15:20:09 tsutsui 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  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #ifdef _STANDALONE
     40 #include <lib/libsa/stand.h>
     41 #include <lib/libkern/libkern.h>
     42 #endif
     43 
     44 #include <sys/types.h>
     45 #include <sys/param.h>
     46 #include "bootxx.h"
     47 
     48 #include <machine/sector.h>
     49 #include <machine/sbd.h>
     50 
     51 int ustar_size(const char *);
     52 
     53 int
     54 fileread(const char *fname, size_t *size)
     55 {
     56 	uint8_t *p = (void *)SDBOOT_PDINFOADDR;
     57 
     58 	if (dk_read(16, 1, p) != 0)
     59 		return BERR_TARHDR;
     60 
     61 	if (((*(uint32_t *)(p + 256)) & 0xffffff) != 0x757374)
     62 		return BERR_TARMAGIC;
     63 
     64 	*size = ustar_size(p + 124);
     65 	if (dk_read(17, ROUND_SECTOR(*size) >> DEV_BSHIFT,
     66 	    (void *)SDBOOT_SCRATCHADDR) != 0)
     67 		return BERR_RDFILE;
     68 
     69 	return 0;
     70 }
     71 
     72 int
     73 ustar_size(const char *p)
     74 {
     75 	int i, j, k;
     76 
     77 	for (i = 0, j = 0, k = 1, p += 10; i < 11; i++, p--, k *= 8)
     78 		j += (*p - '0') * k;
     79 
     80 	return j;
     81 }
     82