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/*
* cook - file construction tool
* Copyright (C) 1994, 1997, 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 POSIX cksum fingerprints
*/
#include <common/ac/string.h>
#include <common/fp/cksum.h>
#include <common/fp/crc32.h>
#include <common/fp/len.h>
typedef struct cksum_ty cksum_ty;
struct cksum_ty
{
FINGERPRINT_BASE_CLASS
fingerprint_ty *crc32;
fingerprint_ty *len;
};
static void
cksum_constructor(fingerprint_ty *p)
{
cksum_ty *f;
f = (cksum_ty *)p;
f->crc32 = fingerprint_new(&fp_crc32);
f->len = fingerprint_new(&fp_len);
}
static void
cksum_destructor(fingerprint_ty *p)
{
cksum_ty *f;
f = (cksum_ty *)p;
fingerprint_delete(f->crc32);
fingerprint_delete(f->len);
}
static void
cksum_addn(fingerprint_ty *p, const void *s, size_t n)
{
cksum_ty *f;
f = (cksum_ty *)p;
fingerprint_addn(f->crc32, s, n);
fingerprint_addn(f->len, s, n);
}
static int
cksum_hash(fingerprint_ty *p, unsigned char *h, size_t h_len)
{
cksum_ty *f;
int nbytes;
unsigned char *obuf;
f = (cksum_ty *)p;
obuf = h;
nbytes = fingerprint_hash(f->crc32, h, h_len);
h += nbytes;
h_len -= nbytes;
nbytes = fingerprint_hash(f->len, h, h_len);
h += nbytes;
h_len -= nbytes;
return (h - obuf);
}
static void
cksum_sum(fingerprint_ty *p, char *s, size_t len)
{
cksum_ty *f;
size_t len1;
f = (cksum_ty *)p;
fingerprint_sum(f->crc32, s, len);
len1 = strlen(s);
s += len1;
len -= len1;
*s++ = ' ';
--len;
fingerprint_sum(f->len, s, len);
}
fingerprint_methods_ty fp_cksum =
{
sizeof(cksum_ty),
"cksum",
cksum_constructor,
cksum_destructor,
cksum_addn,
cksum_hash,
cksum_sum
};
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