/*
 *	cook - file construction tool
 *	Copyright (C) 1994, 1998, 1999 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 fingerprints
 */

#include <ac/errno.h>
#include <ac/fcntl.h>
#include <ac/unistd.h>

#include <fp.h>
#include <mem.h>


fingerprint_ty *
fingerprint_new(mp)
	fingerprint_methods_ty *mp;
{
	fingerprint_ty	*fp;

	fp = mem_alloc(mp->size);
	fp->method = mp;
	mp->constructor(fp);
	return fp;
}


void
fingerprint_delete(fp)
	fingerprint_ty	*fp;
{
	fp->method->destructor(fp);
	mem_free(fp);
}


static int fingerprint_scan _((fingerprint_ty *, char *));

static int
fingerprint_scan(fp, fn)
	fingerprint_ty	*fp;
	char		*fn;
{
	int		fd;
	unsigned char	ibuf[1024];
	long		nbytes;
	int		err;

	if (fn)
	{
		fd = open(fn, O_RDONLY, 0666);
		if (fd < 0)
			return -1;
	}
	else
		fd = 0;
	for (;;)
	{
		nbytes = read(fd, ibuf, sizeof(ibuf));
		if (nbytes < 0)
		{
			if (fn)
			{
				err = errno;
				close(fd);
				errno = err;
			}
			return -1;
		}
		if (nbytes == 0)
			break;
		fingerprint_addn(fp, ibuf, nbytes);
	}
	if (fn && close(fd) < 0)
		return -1;
	return 0;
}


int
fingerprint_file_hash(fp, fn, obuf)
	fingerprint_ty	*fp;
	char		*fn;
	unsigned char	*obuf;
{
	if (fingerprint_scan(fp, fn))
		return -1;
	return fingerprint_hash(fp, obuf);
}


int
fingerprint_file_sum(fp, fn, obuf)
	fingerprint_ty	*fp;
	char		*fn;
	char		*obuf;
{
	if (fingerprint_scan(fp, fn))
		return -1;
	fingerprint_sum(fp, obuf);
	return 0;
}


void
fingerprint_add(p, c)
	fingerprint_ty	*p;
	int		c;
{
	unsigned char	buf;

	buf = c;
	fingerprint_addn(p, &buf, 1);
}