mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-12-01 07:59:05 +08:00
4708ea3b42
A haystack which is shorter than the needle resulted in negative value for length_haystack which was forced to a very large unsigned value. The resulting buffer overflow while reading the haystack would crash text2image when it was called with a short font name. Signed-off-by: Stefan Weil <sw@weilnetz.de>
80 lines
2.9 KiB
C++
80 lines
2.9 KiB
C++
/*
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to
|
|
deal in the Software without restriction, including without limitation the
|
|
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
sell copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies of the Software and its Copyright notices. In addition publicly
|
|
documented acknowledgment must be given that this software has been used if no
|
|
source code of this software is made available publicly. Making the source
|
|
available publicly means including the source for this software with the
|
|
distribution, or a method to get this software via some reasonable mechanism
|
|
(electronic transfer via a network or media) as well as making an offer to
|
|
supply the source on request. This Copyright notice serves as an offer to
|
|
supply the source on on request as well. Instead of this, supplying
|
|
acknowledgments of use of this software in either Copyright notices, Manuals,
|
|
Publicity and Marketing documents or any documentation provided with any
|
|
product containing this software. This License does not apply to any software
|
|
that links to the libraries provided by this software (statically or
|
|
dynamically), but only to the software provided.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
Source:
|
|
Evil 1.7.4
|
|
The Evil library tried to port some convenient Unix functions
|
|
to the Windows (XP or CE) platform. They are planned to be used
|
|
|
|
http://git.enlightenment.org/legacy/evil.git/tree/src/lib/evil_string.c?id=eeaddf80d0d547d4c216974038c0599b34359695
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
|
|
char *strcasestr(const char *haystack, const char *needle) {
|
|
size_t length_needle;
|
|
size_t length_haystack;
|
|
size_t i;
|
|
|
|
if (!haystack || !needle)
|
|
return NULL;
|
|
|
|
length_needle = strlen(needle);
|
|
length_haystack = strlen(haystack);
|
|
|
|
if (length_haystack < length_needle)
|
|
return NULL;
|
|
|
|
length_haystack -= length_needle;
|
|
|
|
for (i = 0; i <= length_haystack; i++)
|
|
{
|
|
size_t j;
|
|
|
|
for (j = 0; j < length_needle; j++)
|
|
{
|
|
unsigned char c1;
|
|
unsigned char c2;
|
|
|
|
c1 = haystack[i+j];
|
|
c2 = needle[j];
|
|
if (toupper(c1) != toupper(c2))
|
|
goto next;
|
|
}
|
|
return (char *) haystack + i;
|
|
next:
|
|
;
|
|
}
|
|
|
|
return NULL;
|
|
}
|