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/*
* Copyright (c) 2015-2016, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Intel Corporation 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include "database_util.h"
#include "hs_common.h"
#include <cassert>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#if defined(HAVE_MMAP)
#include <sys/mman.h> // for mmap
#include <unistd.h> // for close
#include <sys/fcntl.h>
#include <sys/stat.h>
#endif
using namespace std;
bool saveDatabase(const hs_database_t *db, const char *filename, bool verbose) {
assert(db);
assert(filename);
if (verbose) {
cout << "Saving database to: " << filename << endl;
}
char *bytes = nullptr;
size_t length = 0;
hs_error_t err = hs_serialize_database(db, &bytes, &length);
if (err != HS_SUCCESS) {
return false;
}
assert(bytes);
assert(length > 0);
ofstream out(filename, ios::binary);
out.write(bytes, length);
out.close();
::free(bytes);
return true;
}
hs_database_t * loadDatabase(const char *filename, bool verbose) {
assert(filename);
if (verbose) {
cout << "Loading database from: " << filename << endl;
}
char *bytes = nullptr;
#if defined(HAVE_MMAP)
// Use mmap to read the file
int fd = open(filename, O_RDONLY);
if (fd < 0) {
return nullptr;
}
struct stat st;
if (fstat(fd, &st) < 0) {
close(fd);
return nullptr;
}
size_t len = st.st_size;
bytes = (char *)mmap(nullptr, len, PROT_READ, MAP_SHARED, fd, 0);
if (bytes == MAP_FAILED) {
cout << "mmap failed" << endl;
close(fd);
return nullptr;
}
#else
// Fall back on stream IO
ifstream is;
is.open(filename, ios::in | ios::binary);
if (!is.is_open()) {
return nullptr;
}
is.seekg(0, ios::end);
size_t len = is.tellg();
if (verbose) {
cout << "Reading " << len << " bytes" << endl;
}
is.seekg(0, ios::beg);
bytes = new char[len];
is.read(bytes, len);
is.close();
#endif
assert(bytes);
if (verbose) {
char *info = nullptr;
hs_error_t err = hs_serialized_database_info(bytes, len, &info);
if (err) {
cout << "Unable to decode serialized database info: " << err
<< endl;
} else if (info) {
cout << "Serialized database info: " << info << endl;
std::free(info);
} else {
cout << "Unable to decode serialized database info." << endl;
}
}
hs_database_t *db = nullptr;
hs_error_t err = hs_deserialize_database(bytes, len, &db);
#if defined(HAVE_MMAP)
munmap(bytes, len);
close(fd);
#else
delete [] bytes;
#endif
if (err != HS_SUCCESS) {
cout << "hs_deserialize_database call failed: " << err << endl;
return nullptr;
}
assert(db);
return db;
}
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