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/*
* Copyright (C) 2003 Glenn L. McGrath
* Copyright (C) 2003-2004 Erik Andersen
*
* 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 02111-1307, USA.
*/
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#ifndef __INTERIX
#include <inttypes.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "busybox.h"
/* pass in a fd and get back a fd; filename is for display only */
typedef int (*hash_cb_t) (int, const char *);
static int hash_cb_default(int fd, _q_unused_ const char *filename) { return fd; }
/* This might be useful elsewhere */
static unsigned char *hash_bin_to_hex(unsigned char *hash_value,
unsigned char hash_length)
{
int x, len, max;
unsigned char *hex_value;
max = (hash_length * 2) + 2;
hex_value = xmalloc(max);
for (x = len = 0; x < hash_length; x++) {
len += snprintf((char*)(hex_value + len), max - len, "%02x", hash_value[x]);
}
return (hex_value);
}
static unsigned char *hash_file_at_cb(int dfd, const char *filename, uint8_t hash_algo, hash_cb_t cb)
{
int fd;
fd = openat(dfd, filename, O_RDONLY|O_CLOEXEC);
if (fd != -1) {
static uint8_t hash_value_bin[20];
static unsigned char *hash_value;
fd = cb(fd, filename);
if (hash_fd(fd, -1, hash_algo, hash_value_bin) != -2)
hash_value = hash_bin_to_hex(hash_value_bin, hash_algo == HASH_MD5 ? 16 : 20);
else
hash_value = NULL;
close(fd);
return hash_value;
}
return NULL;
}
static unsigned char *hash_file_at(int dfd, const char *filename, uint8_t hash_algo)
{
return hash_file_at_cb(dfd, filename, hash_algo, hash_cb_default);
}
static unsigned char *hash_file_cb(const char *filename, uint8_t hash_algo, hash_cb_t cb)
{
return hash_file_at_cb(AT_FDCWD, filename, hash_algo, cb);
}
static unsigned char *hash_file(const char *filename, uint8_t hash_algo)
{
return hash_file_cb(filename, hash_algo, hash_cb_default);
}
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