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/*
* cook - file construction tool
* Copyright (C) 1994, 1997 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 combined fingerprints
*
* Derived from code marked:
* Daniel J. Bernstein, brnstnd@nyu.edu.
* 930708: fprintfile 0.95. Public domain.
* 930708: Added fingerprintfile_addn.
* 930622: Split off fprintfmt.c.
* 930601: Baseline, fprintfile 0.8. Public domain.
* No known patent problems.
*/
#include <fp/combined.h>
#include <fp/crc32.h>
#include <fp/len.h>
#include <fp/md5.h>
#include <fp/snefru.h>
#include <trace.h>
typedef struct combined_ty combined_ty;
struct combined_ty
{
FINGERPRINT_BASE_CLASS
fingerprint_ty *snefru;
fingerprint_ty *md5;
fingerprint_ty *crc32;
fingerprint_ty *len;
};
static void combined_constructor _((fingerprint_ty *));
static void
combined_constructor(p)
fingerprint_ty *p;
{
combined_ty *f;
trace(("constructor\n"));
f = (combined_ty *)p;
f->snefru = fingerprint_new(&fp_snefru);
f->md5 = fingerprint_new(&fp_md5);
f->crc32 = fingerprint_new(&fp_crc32);
f->len = fingerprint_new(&fp_len);
}
static void combined_destructor _((fingerprint_ty *));
static void
combined_destructor(p)
fingerprint_ty *p;
{
combined_ty *f;
f = (combined_ty *)p;
fingerprint_delete(f->snefru);
fingerprint_delete(f->md5);
fingerprint_delete(f->crc32);
fingerprint_delete(f->len);
}
static void combined_addn _((fingerprint_ty *, unsigned char *, int));
static void
combined_addn(p, s, n)
fingerprint_ty *p;
unsigned char *s;
int n;
{
combined_ty *f;
f = (combined_ty *)p;
fingerprint_addn(f->snefru, s, n);
fingerprint_addn(f->md5, s, n);
fingerprint_addn(f->crc32, s, n);
fingerprint_addn(f->len, s, n);
}
static int combined_hash _((fingerprint_ty *, unsigned char *));
static int
combined_hash(p, h)
fingerprint_ty *p;
unsigned char *h;
{
combined_ty *f;
int nbytes;
unsigned char *obuf;
f = (combined_ty *)p;
obuf = h;
nbytes = fingerprint_hash(f->snefru, h);
h += nbytes;
nbytes = fingerprint_hash(f->md5, h);
h += nbytes;
nbytes = fingerprint_hash(f->crc32, h);
h += nbytes;
nbytes = fingerprint_hash(f->len, h);
h += nbytes;
return (h - obuf);
}
static char base64sane[] =
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ:.";
static void combined_sum _((fingerprint_ty *, char *));
static void
combined_sum(p, s)
fingerprint_ty *p;
char *s;
{
unsigned char h[1024];
int i;
unsigned long x;
int nbytes;
nbytes = combined_hash(p, h);
assert(nbytes == 57);
for (i = 0; i < 19; ++i)
{
x =
(
h[3 * i]
+
256L
*
(
h[3 * i + 1]
+
256L * h[3 * i + 2]
)
);
s[(12 * i) % 76] = base64sane[x & 63];
x /= 64;
s[(12 * i + 41) % 76] = base64sane[x & 63];
x /= 64;
s[(12 * i + 6) % 76] = base64sane[x & 63];
x /= 64;
s[(12 * i + 47) % 76] = base64sane[x & 63];
}
s[76] = 0;
}
fingerprint_methods_ty fp_combined =
{
sizeof(combined_ty),
"fingerprint",
combined_constructor,
combined_destructor,
combined_addn,
combined_hash,
combined_sum
};
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