1*43a90889SApple OSS Distributions /*
2*43a90889SApple OSS Distributions * Copyright (c) 2016 Apple Inc. All rights reserved.
3*43a90889SApple OSS Distributions *
4*43a90889SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*43a90889SApple OSS Distributions *
6*43a90889SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*43a90889SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*43a90889SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*43a90889SApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*43a90889SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*43a90889SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*43a90889SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*43a90889SApple OSS Distributions * terms of an Apple operating system software license agreement.
14*43a90889SApple OSS Distributions *
15*43a90889SApple OSS Distributions * Please obtain a copy of the License at
16*43a90889SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*43a90889SApple OSS Distributions *
18*43a90889SApple OSS Distributions * The Original Code and all software distributed under the License are
19*43a90889SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*43a90889SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*43a90889SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*43a90889SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*43a90889SApple OSS Distributions * Please see the License for the specific language governing rights and
24*43a90889SApple OSS Distributions * limitations under the License.
25*43a90889SApple OSS Distributions *
26*43a90889SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*43a90889SApple OSS Distributions */
28*43a90889SApple OSS Distributions
29*43a90889SApple OSS Distributions #include <libkern/libkern.h>
30*43a90889SApple OSS Distributions
31*43a90889SApple OSS Distributions static int
hex2int(int c)32*43a90889SApple OSS Distributions hex2int(int c)
33*43a90889SApple OSS Distributions {
34*43a90889SApple OSS Distributions if (c >= '0' && c <= '9') {
35*43a90889SApple OSS Distributions return c - '0';
36*43a90889SApple OSS Distributions } else if (c >= 'A' && c <= 'F') {
37*43a90889SApple OSS Distributions return c - 'A' + 10;
38*43a90889SApple OSS Distributions } else if (c >= 'a' && c <= 'f') {
39*43a90889SApple OSS Distributions return c - 'a' + 10;
40*43a90889SApple OSS Distributions }
41*43a90889SApple OSS Distributions return 0;
42*43a90889SApple OSS Distributions }
43*43a90889SApple OSS Distributions
44*43a90889SApple OSS Distributions static bool
isprint(int ch)45*43a90889SApple OSS Distributions isprint(int ch)
46*43a90889SApple OSS Distributions {
47*43a90889SApple OSS Distributions return ch >= 0x20 && ch <= 0x7e;
48*43a90889SApple OSS Distributions }
49*43a90889SApple OSS Distributions
50*43a90889SApple OSS Distributions /*
51*43a90889SApple OSS Distributions * In-place decode of URL percent-encoded str
52*43a90889SApple OSS Distributions */
53*43a90889SApple OSS Distributions void
url_decode(char * str)54*43a90889SApple OSS Distributions url_decode(char *str)
55*43a90889SApple OSS Distributions {
56*43a90889SApple OSS Distributions if (!str) {
57*43a90889SApple OSS Distributions return;
58*43a90889SApple OSS Distributions }
59*43a90889SApple OSS Distributions
60*43a90889SApple OSS Distributions while (*str) {
61*43a90889SApple OSS Distributions if (*str == '%') {
62*43a90889SApple OSS Distributions char c = 0;
63*43a90889SApple OSS Distributions char *esc = str++; /* remember the start of the escape sequence */
64*43a90889SApple OSS Distributions
65*43a90889SApple OSS Distributions if (*str) {
66*43a90889SApple OSS Distributions c += hex2int(*str++);
67*43a90889SApple OSS Distributions }
68*43a90889SApple OSS Distributions if (*str) {
69*43a90889SApple OSS Distributions c = (char)((c << 4) + hex2int(*str++));
70*43a90889SApple OSS Distributions }
71*43a90889SApple OSS Distributions
72*43a90889SApple OSS Distributions if (isprint(c)) {
73*43a90889SApple OSS Distributions /* overwrite the '%' with the new char, and bump the rest of the
74*43a90889SApple OSS Distributions * string down a few characters */
75*43a90889SApple OSS Distributions *esc++ = c;
76*43a90889SApple OSS Distributions str = memmove(esc, str, strlen(str) + 1);
77*43a90889SApple OSS Distributions }
78*43a90889SApple OSS Distributions } else {
79*43a90889SApple OSS Distributions str++;
80*43a90889SApple OSS Distributions }
81*43a90889SApple OSS Distributions }
82*43a90889SApple OSS Distributions }
83