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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef SEARCH_H
#define SEARCH_H
#include "util.h"
#include <list>
#include <map>
#include <vector>
#include <cstring>
class Hasher {
public:
struct Hash {
uint8 digest[16];
bool operator==(const Hash &r) const {
return !std::memcmp(digest, r.digest, sizeof(digest));
}
bool operator<(const Hash &r) const {
return std::memcmp(digest, r.digest, sizeof(digest)) < 0;
}
};
static Hash createHash(const byte *data, uint32 size);
};
struct SearchData {
uint32 size;
uint32 byteSum;
Hasher::Hash hash;
bool operator==(const SearchData &r) const {
return (size == r.size && byteSum == r.byteSum && hash == r.hash);
}
bool operator<(const SearchData &r) const {
return (size < r.size && byteSum < r.byteSum && hash < r.hash);
}
};
class SearchCreator {
public:
static SearchData create(const char *filename);
static SearchData create(const byte *buffer, uint32 size);
};
class SumCreator {
public:
typedef std::list<uint32> InputList;
typedef std::vector<byte> DataInput;
SumCreator(InputList list, const DataInput &input);
bool nextByte();
uint32 getOffset() const { return _curOffset; }
bool hasSum(uint32 size) const;
uint32 getSum(uint32 size) const;
private:
uint32 _curOffset;
DataInput _input;
typedef std::map<uint32, uint32> SumMap;
SumMap _sums;
};
class Search {
public:
Search(const char *filename);
Search(const byte *data, uint32 size);
void addData(SearchData data);
struct ResultData {
SearchData data;
uint32 offset;
ResultData() : data(), offset() {}
ResultData(SearchData d, uint32 o) : data(d), offset(o) {}
};
typedef std::list<ResultData> ResultList;
bool search(ResultList &res);
private:
SumCreator::DataInput _data;
typedef std::list<SearchData> SearchList;
SearchList _search;
};
#endif
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