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/*
* Copyright 2008 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/base/urlencode.h"
#include "webrtc/base/common.h"
#include "webrtc/base/stringutils.h"
static int HexPairValue(const char * code) {
int value = 0;
for (const char * pch = code; pch < code + 2; ++pch) {
value <<= 4;
int digit = *pch;
if (digit >= '0' && digit <= '9') {
value += digit - '0';
}
else if (digit >= 'A' && digit <= 'F') {
value += digit - 'A' + 10;
}
else if (digit >= 'a' && digit <= 'f') {
value += digit - 'a' + 10;
}
else {
return -1;
}
}
return value;
}
static int InternalUrlDecode(const char *source, char *dest,
bool encode_space_as_plus) {
char * start = dest;
while (*source) {
switch (*source) {
case '+':
if (encode_space_as_plus) {
*(dest++) = ' ';
} else {
*dest++ = *source;
}
break;
case '%':
if (source[1] && source[2]) {
int value = HexPairValue(source + 1);
if (value >= 0) {
*(dest++) = static_cast<char>(value);
source += 2;
}
else {
*dest++ = '?';
}
}
else {
*dest++ = '?';
}
break;
default:
*dest++ = *source;
}
source++;
}
*dest = 0;
return static_cast<int>(dest - start);
}
static bool IsValidUrlChar(char ch, bool unsafe_only) {
if (unsafe_only) {
return !(ch <= ' ' || strchr("\\\"^&`<>[]{}", ch));
} else {
return isalnum(ch) || strchr("-_.!~*'()", ch);
}
}
namespace rtc {
int UrlDecode(const char *source, char *dest) {
return InternalUrlDecode(source, dest, true);
}
int UrlDecodeWithoutEncodingSpaceAsPlus(const char *source, char *dest) {
return InternalUrlDecode(source, dest, false);
}
int InternalUrlEncode(const char *source, char *dest, unsigned int max,
bool encode_space_as_plus, bool unsafe_only) {
static const char *digits = "0123456789ABCDEF";
if (max == 0) {
return 0;
}
char *start = dest;
while (static_cast<unsigned>(dest - start) < max && *source) {
unsigned char ch = static_cast<unsigned char>(*source);
if (*source == ' ' && encode_space_as_plus && !unsafe_only) {
*dest++ = '+';
} else if (IsValidUrlChar(ch, unsafe_only)) {
*dest++ = *source;
} else {
if (static_cast<unsigned>(dest - start) + 4 > max) {
break;
}
*dest++ = '%';
*dest++ = digits[(ch >> 4) & 0x0F];
*dest++ = digits[ ch & 0x0F];
}
source++;
}
ASSERT(static_cast<unsigned int>(dest - start) < max);
*dest = 0;
return static_cast<int>(dest - start);
}
int UrlEncode(const char *source, char *dest, unsigned max) {
return InternalUrlEncode(source, dest, max, true, false);
}
int UrlEncodeWithoutEncodingSpaceAsPlus(const char *source, char *dest,
unsigned max) {
return InternalUrlEncode(source, dest, max, false, false);
}
int UrlEncodeOnlyUnsafeChars(const char *source, char *dest, unsigned max) {
return InternalUrlEncode(source, dest, max, false, true);
}
std::string
InternalUrlDecodeString(const std::string & encoded,
bool encode_space_as_plus) {
size_t needed_length = encoded.length() + 1;
char* buf = STACK_ARRAY(char, needed_length);
InternalUrlDecode(encoded.c_str(), buf, encode_space_as_plus);
return buf;
}
std::string
UrlDecodeString(const std::string & encoded) {
return InternalUrlDecodeString(encoded, true);
}
std::string
UrlDecodeStringWithoutEncodingSpaceAsPlus(const std::string & encoded) {
return InternalUrlDecodeString(encoded, false);
}
std::string
InternalUrlEncodeString(const std::string & decoded,
bool encode_space_as_plus,
bool unsafe_only) {
int needed_length = static_cast<int>(decoded.length()) * 3 + 1;
char* buf = STACK_ARRAY(char, needed_length);
InternalUrlEncode(decoded.c_str(), buf, needed_length,
encode_space_as_plus, unsafe_only);
return buf;
}
std::string
UrlEncodeString(const std::string & decoded) {
return InternalUrlEncodeString(decoded, true, false);
}
std::string
UrlEncodeStringWithoutEncodingSpaceAsPlus(const std::string & decoded) {
return InternalUrlEncodeString(decoded, false, false);
}
std::string
UrlEncodeStringForOnlyUnsafeChars(const std::string & decoded) {
return InternalUrlEncodeString(decoded, false, true);
}
} // namespace rtc
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