diff --git a/thermosphere/src/pattern_utils.c b/thermosphere/src/pattern_utils.c
new file mode 100644
index 000000000..c5931dced
--- /dev/null
+++ b/thermosphere/src/pattern_utils.c
@@ -0,0 +1,251 @@
+/*
+ * 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 .
+ */
+
+#include
+#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);
+}
diff --git a/thermosphere/src/pattern_utils.h b/thermosphere/src/pattern_utils.h
new file mode 100644
index 000000000..c4c439801
--- /dev/null
+++ b/thermosphere/src/pattern_utils.h
@@ -0,0 +1,25 @@
+/*
+ * 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 .
+ */
+
+#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);