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/*
* cook - file construction tool
* Copyright (C) 1994, 1997, 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 <ac/dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fp.h>
#include <str_list.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_dir _((fingerprint_ty *, char *));
static int
fingerprint_scan_dir(fp, fn)
fingerprint_ty *fp;
char *fn;
{
DIR *dp;
string_list_ty wl;
string_ty *s;
size_t j;
/*
* Read the directory contents, and remember the names.
* Don't hash it just yet.
*/
dp = opendir(fn);
if (!dp)
return -1;
string_list_constructor(&wl);
for (;;)
{
struct dirent *dep;
dep = readdir(dp);
if (!dep)
break;
s = str_from_c(dep->d_name);
string_list_append(&wl, s);
str_free(s);
}
closedir(dp);
/*
* Sort the names before we hash anything. That way, even if
* the files in the directory get re-arranged, the hash stays
* the same. This is common when a file is deleted, and then
* re-created in identical form.
*/
string_list_sort(&wl);
/*
* Now hash the strings in the list. This takes advantage of
* the fact that all the strings are NUL terminated to introduce
* a unique separator.
*/
for (j = 0; j < wl.nstrings; ++j)
{
s = wl.string[j];
fingerprint_addn(fp, s->str_text, s->str_length + 1);
}
string_list_destructor(&wl);
return 0;
}
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)
{
struct stat st;
/*
* The most common case is to obtain a fingerprint for
* a file. In the rare case that it is a directory,
* we need to do things differently.
*/
if (stat(fn, &st) == 0 && S_ISDIR(st.st_mode))
{
return fingerprint_scan_dir(fp, fn);
}
/*
* Assume it's a normal file.
* (Slow things will happen if, say, it's a tape device.)
*/
fd = open(fn, O_RDONLY|O_BINARY, 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);
}
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