编译hyperscan 4.0.0的完整攻略
Hyperscan是一个高性能的多模式字符串匹配库,可以用于网络安全、数据分析等领域。本文将介绍如何编译hyperscan 4.0.0。
步骤1:安装依赖项
在编译hyperscan之前,需要安装一些依赖项。可以使用以下命令在Ubuntu上安装这些依赖项:
sudo apt-get install cmake ragel libboost-all-dev libpcap-dev liblzma-dev libssl-dev
步骤2:下载hyperscan
可以从hyperscan的官方网站(https://www.hyperscan.io/)下载hyperscan的源代码。也可以使用以下命令从GitHub上克隆hyperscan的源代码:
git clone https://github.com/intel/hyperscan.git
步骤3:编译hyperscan
可以使用以下命令编译hyperscan:
cd hyperscan
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make
sudo make install
这将编译并安装hyperscan。
示例1:使用hyperscan进行正则表达式匹配
以下是一个示例,演示如何使用hyperscan进行正则表达式匹配:
#include <hs/hs.h>
#include <iostream>
using namespace std;
int main() {
hs_database_t *database = NULL;
hs_compile_error_t *compile_err = NULL;
hs_error_t err;
const char *regex = "hello";
const char *data = "hello world";
unsigned int data_len = strlen(data);
err = hs_compile(regex, HS_FLAG_CASELESS, HS_MODE_BLOCK, NULL, &database, &compile_err);
if (err != HS_SUCCESS) {
cerr << "ERROR: Unable to compile pattern \"" << regex << "\": " << compile_err->message << endl;
hs_free_compile_error(compile_err);
return -1;
}
hs_scratch_t *scratch = NULL;
err = hs_alloc_scratch(database, &scratch);
if (err != HS_SUCCESS) {
cerr << "ERROR: Unable to allocate scratch space. Exiting." << endl;
hs_free_database(database);
return -1;
}
err = hs_scan(database, data, data_len, 0, scratch, [](unsigned int id, unsigned long long from, unsigned long long to, unsigned int flags, void *ctx) -> int {
cout << "Match found at offset " << from << endl;
return 0;
}, NULL);
hs_free_scratch(scratch);
hs_free_database(database);
return 0;
}
这将使用hyperscan进行正则表达式匹配,并在控制台中输出匹配结果。
示例2:使用hyperscan进行多模式匹配
以下是一个示例,演示如何使用hyperscan进行多模式匹配:
#include <hs/hs.h>
#include <iostream>
using namespace std;
int main() {
hs_database_t *database = NULL;
hs_compile_error_t *compile_err = NULL;
hs_error_t err;
const char *regexes[] = {"hello", "world"};
const char *data = "hello world";
unsigned int data_len = strlen(data);
err = hs_compile_multi(regexes, NULL, NULL, NULL, 2, HS_FLAG_CASELESS, HS_MODE_BLOCK, NULL, &database, &compile_err);
if (err != HS_SUCCESS) {
cerr << "ERROR: Unable to compile patterns: " << compile_err->message << endl;
hs_free_compile_error(compile_err);
return -1;
}
hs_scratch_t *scratch = NULL;
err = hs_alloc_scratch(database, &scratch);
if (err != HS_SUCCESS) {
cerr << "ERROR: Unable to allocate scratch space. Exiting." << endl;
hs_free_database(database);
return -1;
}
err = hs_scan(database, data, data_len, 0, scratch, [](unsigned int id, unsigned long long from, unsigned long long to, unsigned int flags, void *ctx) -> int {
cout << "Match found at offset " << from << endl;
return 0;
}, NULL);
hs_free_scratch(scratch);
hs_free_database(database);
return 0;
}
这将使用hyperscan进行多模式匹配,并在控制台中输出匹配结果。
结论
Hyperscan是一个高性能的多模式字符串匹配库,可以用于网络安全、数据分析等领域。通过安装依赖项、下载源代码、编译hyperscan,我们可以轻松地使用hyperscan进行正则表达式匹配和多模式匹配。