/*
 * Copyright 2002, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Tyler Dauwalder
 */

/*!
        \file sniffer/Pattern.h
        Mime Sniffer Pattern declarations
*/

#ifndef _SNIFFER_PATTERN_H
#define _SNIFFER_PATTERN_H


#include <string>

#include "Range.h"


namespace BPrivate {
namespace Storage {
namespace Sniffer {

class Err;
struct Data;


//! A byte string and optional mask to be compared against a data stream.
/*! The byte string and mask (if supplied) must be of the same length. */
class Pattern {
public:
        static Pattern* Create(bool caseInsensitive,
                const std::string& string, std::string mask = std::string());
        ~Pattern();

        status_t InitCheck() const;
        Err* GetErr() const;

        bool Sniff(Range range, const Data& data) const;
        ssize_t BytesNeeded() const;

protected:
        friend class RPattern;

        static void* _Create(size_t baseSize, size_t offset,
                bool caseInsensitive, const std::string& string, std::string mask);
        Pattern(bool caseInsensitive, const std::string& string, std::string mask);

private:
        bool _SniffNext(off_t& start, off_t end, const Data& data) const;

        void SetStatus(status_t status, const char *msg = NULL);
        void SetErrorMessage(const char *msg);

private:
        status_t fCStatus;
        Err *fErrorMessage;

        bool fCaseInsensitive;
        uint32 fStringLength;
        uint32 fUnmaskedStartLength;
        uint8 fData[];
};


}; // namespace Sniffer
}; // namespace Storage
}; // namespace BPrivate


#endif // _SNIFFER_PATTERN_H