sumset.h

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/*= -*- c-basic-offset: 4; indent-tabs-mode: nil; -*-
 *
 * librsync -- the library for network deltas
 * $Id: sumset.h,v 1.1.1.1 2002/01/25 22:15:09 kergoth Exp $
 * 
 * Copyright (C) 1999, 2000, 2001 by Martin Pool <mbp@samba.org>
 * Copyright (C) 1999 by Andrew Tridgell <tridge@samba.org>
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


/*
 * TODO: These structures are not terribly useful.  Perhaps we need a
 * splay tree or something that will let us smoothly grow as data is
 * read in.
 */


typedef struct rs_target {
    unsigned short  t;
    int             i;
} rs_target_t;

typedef struct rs_block_sig rs_block_sig_t;

/*
 * This structure describes all the sums generated for an instance of
 * a file.  It incorporates some redundancy to make it easier to
 * search.
 */
struct rs_signature {
    rs_long_t       flength;    /* total file length */
    int             count;      /* how many chunks */
    int             remainder;  /* flength % block_length */
    int             block_len;  /* block_length */
    int             strong_sum_len;
    rs_block_sig_t  *block_sigs; /* points to info for each chunk */
    int             *tag_table;
    rs_target_t     *targets;
};


/*
 * All blocks are the same length in the current algorithm except for
 * the last block which may be short.
 */
struct rs_block_sig {
    int             i;          /* index of this chunk */
    rs_weak_sum_t   weak_sum;   /* simple checksum */
    rs_strong_sum_t strong_sum; /* checksum  */
};

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