global.c

WiiFuse is a FUSE filesystem module for Linux and Mac OS X. It will let you mount a Wii disc ISO an

/*
 *  Copyright (C) 2008 dhewg, #wiidev efnet
 *
 *  some functions are taken from
 *  http://git.infradead.org/?p=users/segher/wii.git
 *  Copyright 2007,2008  Segher Boessenkool  <[e-mail]>
 *  21:14:49 <@segher> i'll happily grant you to license the whole as v3, btw
 *
 *  this file is part of wiifuse
 *  http://wiibrew.org/index.php?title=Wiifuse
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "global.h"

u8 verbose_level = 0;

u16 get_be16 (const u8 *p) {
	return (p[0] << 8) | p[1];
}

u32 get_be32 (const u8 *p) {
	return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
}

u64 get_be64 (const u8 *p) {
	return ((u64) get_be32 (p) << 32) | get_be32 (p + 4);
}

void put_be16 (u8 *p, const u16 value) {
	p[0] = (value >> 8) & 0xff;
        p[1] = value & 0xff;
}

void put_be32 (u8 *p, const u32 value) {
	p[0] = (value >> 24) & 0xff;
	p[1] = (value >> 16) & 0xff;
	p[2] = (value >> 8) & 0xff;
        p[3] = value & 0xff;
}

void put_be64 (u8 *p, const u64 value) {
        put_be32 (p, (value >> 32) & 0xffffffff);
        put_be32 (p + 4, value & 0xffffffff);
}

size_t g_strnlen (const char *s, size_t size) {
        size_t i;

        for (i = 0; i < size; ++i)
                if (s[i] == 0)
                        return i;

        return size;
}

u32 get_dol_size (const u8 *header) {
        u8 i;
        u32 offset, size;
        u32 max = 0;

        // iterate through the 7 code segments
        for (i = 0; i < 7; ++i) {
                offset = get_be32 (&header[i * 4]);
                size = get_be32 (&header[0x90 + i * 4]);
                if (offset + size > max)
                        max = offset + size;
        }

        // iterate through the 11 data segments
        for (i = 0; i < 11; ++i) {
                offset = get_be32 (&header[0x1c + i * 4]);
                size = get_be32 (&header[0xac + i * 4]);
                if (offset + size > max)
                        max = offset + size;
        }

        return max;
}