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