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thermosphere: incl pattern utils

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TuxSH 2020-01-21 01:56:35 +00:00
parent 3e8bd764d5
commit a665f49b93
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251
thermosphere/src/pattern_utils.c Normal file
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/*
* Copyright (c) 2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "pattern_utils.h"
//Boyer-Moore Horspool algorithm, adapted from http://www-igm.univ-mlv.fr/~lecroq/string/node18.html#SECTION00180
//u32 size to limit stack usage
u8 *memsearch(u8 *startPos, const void *pattern, u32 size, u32 patternSize)
{
const u8 *patternc = (const u8 *)pattern;
u32 table[256];
//Preprocessing
for(u32 i = 0; i < 256; i++)
table[i] = patternSize;
for(u32 i = 0; i < patternSize - 1; i++)
table[patternc[i]] = patternSize - i - 1;
//Searching
u32 j = 0;
while(j <= size - patternSize)
{
u8 c = startPos[j + patternSize - 1];
if(patternc[patternSize - 1] == c && memcmp(pattern, startPos + j, patternSize - 1) == 0)
return startPos + j;
j += table[c];
}
return NULL;
}
// Copied from newlib, without the reent stuff + some other stuff
/*
* Copyright (c) 1990 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
unsigned int xstrtoui(const char *nptr, char **endptr, int base, bool allowPrefix, bool *ok)
{
register const unsigned char *s = (const unsigned char *)nptr;
register unsigned int acc;
register int c;
register unsigned int cutoff;
register int neg = 0, any, cutlim;
if(ok != NULL)
*ok = true;
/*
* See strtol for comments as to the logic used.
*/
do {
c = *s++;
} while ((c >= 9 && c <= 13) || c == ' ');
if (c == '-') {
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
neg = 1;
c = *s++;
} else if (c == '+'){
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
c = *s++;
}
if ((base == 0 || base == 16) &&
c == '0' && (*s == 'x' || *s == 'X')) {
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
c = s[1];
s += 2;
base = 16;
}
if (base == 0) {
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
base = c == '0' ? 8 : 10;
}
cutoff = (unsigned int)(-1) / (unsigned int)base;
cutlim = (unsigned int)(-1) % (unsigned int)base;
for (acc = 0, any = 0;; c = *s++) {
if (c >= '0' && c <= '9')
c -= '0';
else if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
c -= c >= 'A' && c <= 'Z' ? 'A' - 10 : 'a' - 10;
else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else {
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0) {
acc = (unsigned int)-1;
if(ok != NULL)
*ok = false;
// rptr->_errno = ERANGE;
} else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (char *) (any ? (char *)s - 1 : nptr);
return (acc);
}
// Copied from newlib, without the reent stuff + some other stuff
unsigned long long int xstrtoull(const char *nptr, char **endptr, int base, bool allowPrefix, bool *ok)
{
register const unsigned char *s = (const unsigned char *)nptr;
register unsigned long long acc;
register int c;
register unsigned long long cutoff;
register int neg = 0, any, cutlim;
if(ok != NULL)
*ok = true;
/*
* See strtol for comments as to the logic used.
*/
do {
c = *s++;
} while ((c >= 9 && c <= 13) || c == ' ');
if (c == '-') {
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
neg = 1;
c = *s++;
} else if (c == '+'){
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
c = *s++;
}
if ((base == 0 || base == 16) &&
c == '0' && (*s == 'x' || *s == 'X')) {
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
c = s[1];
s += 2;
base = 16;
}
if (base == 0) {
if(!allowPrefix) {
if(ok != NULL)
*ok = false;
return 0;
}
base = c == '0' ? 8 : 10;
}
cutoff = (unsigned long long)(-1ull) / (unsigned long long)base;
cutlim = (unsigned long long)(-1ull) % (unsigned long long)base;
for (acc = 0, any = 0;; c = *s++) {
if (c >= '0' && c <= '9')
c -= '0';
else if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))
c -= c >= 'A' && c <= 'Z' ? 'A' - 10 : 'a' - 10;
else
break;
if (c >= base)
break;
if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
any = -1;
else {
any = 1;
acc *= base;
acc += c;
}
}
if (any < 0) {
acc = (unsigned long long)-1ull;
if(ok != NULL)
*ok = false;
// rptr->_errno = ERANGE;
} else if (neg)
acc = -acc;
if (endptr != 0)
*endptr = (char *) (any ? (char *)s - 1 : nptr);
return (acc);
}

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thermosphere/src/pattern_utils.h Normal file
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/*
* Copyright (c) 2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "utils.h"
// u32 size to limit stack usage
// Not sure if we need this function because we can only map one guest page at a time...
u8 *memsearch(u8 *startPos, const void *pattern, u32 size, u32 patternSize);
unsigned int xstrtoui(const char *nptr, char **endptr, int base, bool allowPrefix, bool *ok);
unsigned long long int xstrtoull(const char *nptr, char **endptr, int base, bool allowPrefix, bool *ok);