//
//	cook - file construction tool
//	Copyright (C) 1994, 1999, 2003-2008 Peter Miller
//
//	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 3 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, see
//	<http://www.gnu.org/licenses/>.
//

#include <common/ac/stdio.h>

#include <common/fp/len.h>


struct len_ty
{
    FINGERPRINT_BASE_CLASS
    size_t          len;
};


static void
len_constructor(fingerprint_ty *p)
{
    len_ty	    *f;

    f = (len_ty *)p;
    f->len = 0;
}


static void
len_destructor(fingerprint_ty *)
{
}


static void
len_addn(fingerprint_ty *p, unsigned char *, size_t n)
{
    len_ty	    *f;

    f = (len_ty *)p;
    f->len += n;
}


static int
len_hash(fingerprint_ty *p, unsigned char *h)
{
    len_ty	    *f;
    unsigned long   n;
    int		    j;

    //
    // return length as 5 bytes (yes, five)
    //
    f = (len_ty *)p;
    n = f->len;
    f->len = 0;
    for (j = 0; j < 5; ++j)
    {
	h[j] = n & 255;
	n >>= 8;
    }
    return 5;
}


static void
len_sum(fingerprint_ty *p, char *obuf, size_t obuf_len)
{
    len_ty	    *f;

    f = (len_ty *)p;
    snprintf(obuf, obuf_len, "%8lu", (unsigned long)f->len);
}


fingerprint_methods_ty fp_len =
{
    sizeof(len_ty),
    "length",
    len_constructor,
    len_destructor,
    len_addn,
    len_hash,
    len_sum
};