clamav/libclamav/explode.h

/*
 *  Copyright (C) 2013-2024 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
 *  Copyright (C) 2008-2013 Sourcefire, Inc.
 *
 *  Authors: Alberto Wu
 *
 *  Acknowledgements: Written from scratch based on specs from PKWARE:
 *                    http://www.pkware.com/documents/casestudies/APPNOTE.TXT
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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 __EXPLODE_H
#define __EXPLODE_H

#include "clamav-types.h"

enum {
    EXPLODE_EBUFF,
    EXPLODE_ESTREAM
};

#define EXPLODE_OK EXPLODE_EBUFF

enum XPL_STATE {
    GRABLITS,
    GRABLENS,
    GRABDISTS,
    EXPLODE,
    EXPLODE_LITCODES,
    EXPLODE_LITS,
    EXPLODE_BASEDIST,
    EXPLODE_DECODEDISTS,
    EXPLODE_DECODELENS,
    EXPLODE_DECODEEXTRA,
    EXPLODE_WBYTE,
    EXPLODE_BACKCOPY
};

struct xplstate {
    uint8_t *next_in;
    uint8_t *next_out;
    unsigned int got;
    unsigned int minlen;
    unsigned int mask;
    unsigned int cur;
    uint32_t lit_tree[256];
    uint32_t len_tree[64];
    uint32_t dist_tree[64];
    uint32_t bitmap;
    uint32_t avail_in;
    uint32_t avail_out;
    uint16_t backbytes;
    uint16_t backsize;
    uint8_t window[8192];
    enum XPL_STATE state;
    uint8_t bits;
    uint8_t largewin;
    uint8_t litcodes;
};

int explode_init(struct xplstate *, uint16_t);
int explode(struct xplstate *);
void explode_shutdown(void);

#endif /* __EXPLODE_H */