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/*
* cook - file construction tool
* Copyright (C) 1994, 1997, 1999, 2006, 2007 Peter Miller;
* All rights reserved.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
* MANIFEST: functions to manipulate length fingerprints
*/
#include <common/ac/stdio.h>
#include <common/fp/len.h>
typedef struct len_ty len_ty;
struct len_ty
{
FINGERPRINT_BASE_CLASS
unsigned long len;
};
static void
len_constructor(fingerprint_ty *p)
{
len_ty *f;
f = (len_ty *)p;
f->len = 0;
}
static void
len_destructor(fingerprint_ty *p)
{
(void)p;
}
static void
len_addn(fingerprint_ty *p, const void *s, size_t n)
{
len_ty *f;
(void)p;
(void)s;
f = (len_ty *)p;
f->len += n;
}
static int
len_hash(fingerprint_ty *p, unsigned char *h, size_t h_len)
{
len_ty *f;
unsigned long n;
int j;
(void)h_len;
/*
* 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", f->len);
}
fingerprint_methods_ty fp_len =
{
sizeof(len_ty),
"length",
len_constructor,
len_destructor,
len_addn,
len_hash,
len_sum
};
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