ModSecurity/src/actions/transformations/parity_odd_7bit.cc
2020-12-10 10:10:47 -03:00

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1.8 KiB
C++

/*
* ModSecurity, http://www.modsecurity.org/
* Copyright (c) 2015 - 2020 Trustwave Holdings, Inc. (http://www.trustwave.com/)
*
* You may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* If any of the files related to licensing are missing or if you have any
* other questions related to licensing please contact Trustwave Holdings, Inc.
* directly using the email address security@modsecurity.org.
*
*/
#include "src/actions/transformations/parity_odd_7bit.h"
#include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <cctype>
#include <locale>
#include <cstring>
#include "modsecurity/transaction.h"
#include "src/actions/transformations/transformation.h"
namespace modsecurity {
namespace actions {
namespace transformations {
std::string ParityOdd7bit::execute(const std::string &value,
Transaction *transaction) {
std::string ret;
unsigned char *input;
input = reinterpret_cast<unsigned char *>
(malloc(sizeof(char) * value.length()+1));
if (input == NULL) {
return "";
}
memcpy(input, value.c_str(), value.length()+1);
inplace(input, value.length());
ret.assign(reinterpret_cast<char *>(input), value.length());
free(input);
return ret;
}
bool ParityOdd7bit::inplace(unsigned char *input, uint64_t input_len) {
uint64_t i;
i = 0;
while (i < input_len) {
unsigned int x = input[i];
input[i] ^= input[i] >> 4;
input[i] &= 0xf;
if ((0x6996 >> input[i]) & 1) {
input[i] = x & 0x7f;
} else {
input[i] = x | 0x80;
}
i++;
}
return true;
}
} // namespace transformations
} // namespace actions
} // namespace modsecurity