1 /*
2 * Copyright (c) 2000
3 * Traakan, Inc., Los Altos, CA
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
11 * disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Project: NDMJOB
31 * Ident: $Id: $
32 *
33 * Description:
34 * Convert strings to/from a canonical strings (CSTR).
35 *
36 * The main reason for this is to eliminate spaces
37 * in strings thus making multiple strings easily
38 * delimited by white space.
39 *
40 * Canonical strings use the HTTP convention of
41 * percent sign followed by two hex digits (%xx).
42 * Characters outside the printable ASCII range,
43 * space, and percent sign are so converted.
44 *
45 * Both interfaces return the length of the resulting
46 * string, -1 if there is an overflow, or -2
47 * there is a conversion error.
48 */
49
50
51 #include "ndmlib.h"
52
53
54 static char ndmcstr_to_hex[] = "0123456789ABCDEF";
55
56 extern int ndmcstr_from_hex(int c);
57
ndmcstr_from_str(char * src,char * dst,unsigned dst_max)58 int ndmcstr_from_str(char* src, char* dst, unsigned dst_max)
59 {
60 unsigned char* p = (unsigned char*)src;
61 unsigned char* q = (unsigned char*)dst;
62 unsigned char* q_end = q + dst_max - 1;
63 int c;
64
65 while ((c = *p++) != 0) {
66 if (c <= ' ' || c > 0x7E || c == NDMCSTR_WARN) {
67 if (q + 3 > q_end) return -1;
68 *q++ = NDMCSTR_WARN;
69 *q++ = ndmcstr_to_hex[(c >> 4) & 0xF];
70 *q++ = ndmcstr_to_hex[c & 0xF];
71 } else {
72 if (q + 1 > q_end) return -1;
73 *q++ = c;
74 }
75 }
76 *q = 0;
77
78 return q - (unsigned char*)dst;
79 }
80
ndmcstr_to_str(char * src,char * dst,unsigned dst_max)81 int ndmcstr_to_str(char* src, char* dst, unsigned dst_max)
82 {
83 unsigned char* p = (unsigned char*)src;
84 unsigned char* q = (unsigned char*)dst;
85 unsigned char* q_end = q + dst_max - 1;
86 int c, c1, c2;
87
88 while ((c = *p++) != 0) {
89 if (q + 1 > q_end) return -1;
90 if (c != NDMCSTR_WARN) {
91 *q++ = c;
92 continue;
93 }
94 c1 = ndmcstr_from_hex(p[0]);
95 c2 = ndmcstr_from_hex(p[1]);
96
97 if (c1 < 0 || c2 < 0) {
98 /* busted conversion */
99 return -2;
100 }
101
102 c = (c1 << 4) + c2;
103 *q++ = c;
104 p += 2;
105 }
106 *q = 0;
107
108 return q - (unsigned char*)dst;
109 }
110
ndmcstr_from_hex(int c)111 int ndmcstr_from_hex(int c)
112 {
113 if ('0' <= c && c <= '9') return c - '0';
114 if ('a' <= c && c <= 'f') return (c - 'a') + 10;
115 if ('A' <= c && c <= 'F') return (c - 'A') + 10;
116 return -1;
117 }
118