3 * Copyright 2008, Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "talk/base/urlencode.h"
30 #include "talk/base/common.h"
31 #include "talk/base/stringutils.h"
33 static int HexPairValue(const char * code) {
35 const char * pch = code;
38 if (digit >= '0' && digit <= '9') {
41 else if (digit >= 'A' && digit <= 'F') {
42 value += digit - 'A' + 10;
44 else if (digit >= 'a' && digit <= 'f') {
45 value += digit - 'a' + 10;
56 int InternalUrlDecode(const char *source, char *dest,
57 bool encode_space_as_plus) {
63 if (encode_space_as_plus) {
70 if (source[1] && source[2]) {
71 int value = HexPairValue(source + 1);
91 return static_cast<int>(dest - start);
94 int UrlDecode(const char *source, char *dest) {
95 return InternalUrlDecode(source, dest, true);
98 int UrlDecodeWithoutEncodingSpaceAsPlus(const char *source, char *dest) {
99 return InternalUrlDecode(source, dest, false);
102 bool IsValidUrlChar(char ch, bool unsafe_only) {
104 return !(ch <= ' ' || strchr("\\\"^&`<>[]{}", ch));
106 return isalnum(ch) || strchr("-_.!~*'()", ch);
110 int InternalUrlEncode(const char *source, char *dest, unsigned int max,
111 bool encode_space_as_plus, bool unsafe_only) {
112 static const char *digits = "0123456789ABCDEF";
118 while (static_cast<unsigned>(dest - start) < max && *source) {
119 unsigned char ch = static_cast<unsigned char>(*source);
120 if (*source == ' ' && encode_space_as_plus && !unsafe_only) {
122 } else if (IsValidUrlChar(ch, unsafe_only)) {
125 if (static_cast<unsigned>(dest - start) + 4 > max) {
129 *dest++ = digits[(ch >> 4) & 0x0F];
130 *dest++ = digits[ ch & 0x0F];
134 ASSERT(static_cast<unsigned int>(dest - start) < max);
137 return static_cast<int>(dest - start);
140 int UrlEncode(const char *source, char *dest, unsigned max) {
141 return InternalUrlEncode(source, dest, max, true, false);
144 int UrlEncodeWithoutEncodingSpaceAsPlus(const char *source, char *dest,
146 return InternalUrlEncode(source, dest, max, false, false);
149 int UrlEncodeOnlyUnsafeChars(const char *source, char *dest, unsigned max) {
150 return InternalUrlEncode(source, dest, max, false, true);
154 InternalUrlDecodeString(const std::string & encoded,
155 bool encode_space_as_plus) {
156 size_t needed_length = encoded.length() + 1;
157 char* buf = STACK_ARRAY(char, needed_length);
158 InternalUrlDecode(encoded.c_str(), buf, encode_space_as_plus);
163 UrlDecodeString(const std::string & encoded) {
164 return InternalUrlDecodeString(encoded, true);
168 UrlDecodeStringWithoutEncodingSpaceAsPlus(const std::string & encoded) {
169 return InternalUrlDecodeString(encoded, false);
173 InternalUrlEncodeString(const std::string & decoded,
174 bool encode_space_as_plus,
176 int needed_length = static_cast<int>(decoded.length()) * 3 + 1;
177 char* buf = STACK_ARRAY(char, needed_length);
178 InternalUrlEncode(decoded.c_str(), buf, needed_length,
179 encode_space_as_plus, unsafe_only);
184 UrlEncodeString(const std::string & decoded) {
185 return InternalUrlEncodeString(decoded, true, false);
189 UrlEncodeStringWithoutEncodingSpaceAsPlus(const std::string & decoded) {
190 return InternalUrlEncodeString(decoded, false, false);
194 UrlEncodeStringForOnlyUnsafeChars(const std::string & decoded) {
195 return InternalUrlEncodeString(decoded, false, true);