1/*
2 * feature.c --- convert between features and strings
3 *
4 * Copyright (C) 1999  Theodore Ts'o <tytso@mit.edu>
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15#include <ctype.h>
16#include <errno.h>
17
18#include "e2p.h"
19
20struct hash {
21	int		num;
22	const char	*string;
23};
24
25static struct hash hash_list[] = {
26	{	EXT2_HASH_LEGACY, 	"legacy" },
27	{	EXT2_HASH_HALF_MD4, 	"half_md4" },
28	{	EXT2_HASH_TEA, 		"tea" },
29	{	0, 0 },
30};
31
32const char *e2p_hash2string(int num)
33{
34	struct hash  *p;
35	static char buf[20];
36
37	for (p = hash_list; p->string; p++) {
38		if (num == p->num)
39			return p->string;
40	}
41	sprintf(buf, "HASHALG_%d", num);
42	return buf;
43}
44
45/*
46 * Returns the hash algorithm, or -1 on error
47 */
48int e2p_string2hash(char *string)
49{
50	struct hash	*p;
51	char		*eptr;
52	int		num;
53
54	for (p = hash_list; p->string; p++) {
55		if (!strcasecmp(string, p->string)) {
56			return p->num;
57		}
58	}
59	if (strncasecmp(string, "HASHALG_", 8))
60		return -1;
61
62	if (string[8] == 0)
63		return -1;
64	num = strtol(string+8, &eptr, 10);
65	if (num > 255 || num < 0)
66		return -1;
67	if (*eptr)
68		return -1;
69	return num;
70}
71
72