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/* @file urldecode.h
* @brief URL decoding as described by RFC3986.
*/
/* Copyright (C) 2011,2012 Olly Betts
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef OMEGA_INCLUDED_URLDECODE_H
#define OMEGA_INCLUDED_URLDECODE_H
#include <cstdio>
#include <cstring>
#include <string>
struct CGIParameterHandler {
void operator()(const std::string&, const std::string&) const;
};
inline unsigned char hex_decode_(unsigned char hex) {
return (hex & 0x0f) + (hex >> 6) * 9;
}
template<typename I>
inline void
url_decode(const CGIParameterHandler & handle_parameter, I begin, I end)
{
bool seen_equals = false;
std::string var, val;
while (begin != end) {
unsigned char ch = *begin;
++begin;
process_ch:
if (ch == '&') {
if (!seen_equals)
swap(var, val);
if (!var.empty())
handle_parameter(var, val);
var.resize(0);
val.resize(0);
seen_equals = false;
continue;
}
switch (ch) {
case '%': {
if (begin == end)
break;
unsigned char hex1 = *begin;
++begin;
if (begin == end || !isxdigit(hex1)) {
val += ch;
ch = hex1;
if (begin == end)
break;
goto process_ch;
}
unsigned char hex2 = *begin;
++begin;
if (!isxdigit(hex2)) {
val += ch;
val += hex1;
ch = hex2;
if (begin == end)
break;
goto process_ch;
}
ch = (hex_decode_(hex1) << 4) | hex_decode_(hex2);
break;
}
case '+':
ch = ' ';
break;
case '=':
if (seen_equals)
break;
seen_equals = true;
swap(var, val);
continue;
}
val += ch;
}
if (!seen_equals)
swap(var, val);
if (!var.empty())
handle_parameter(var, val);
}
class CStringItor {
const char * p;
void operator++(int);
public:
CStringItor() : p(NULL) { }
explicit CStringItor(const char * p_) : p(p_) {
if (!*p) p = NULL;
}
unsigned char operator *() const { return *p; }
CStringItor & operator++() {
if (!*++p) p = NULL;
return *this;
}
friend bool operator==(const CStringItor& a, const CStringItor& b);
friend bool operator!=(const CStringItor& a, const CStringItor& b);
};
inline bool
operator==(const CStringItor& a, const CStringItor& b)
{
return a.p == b.p;
}
inline bool
operator!=(const CStringItor& a, const CStringItor& b)
{
return !(a == b);
}
class StdinItor {
size_t count;
mutable int current;
void operator++(int);
public:
StdinItor() : current(EOF) { }
explicit StdinItor(size_t count_) : count(count_), current(256) { }
unsigned char operator *() const {
if (current == 256)
current = std::getchar();
return current;
}
StdinItor & operator++() {
if (count--)
current = std::getchar();
else
current = EOF;
return *this;
}
friend bool operator==(const StdinItor& a, const StdinItor& b);
friend bool operator!=(const StdinItor& a, const StdinItor& b);
};
inline bool
operator==(const StdinItor& a, const StdinItor& b)
{
return a.current == b.current;
}
inline bool
operator!=(const StdinItor& a, const StdinItor& b)
{
return !(a == b);
}
// First group is RFC3986 reserved "gen-delims", second reserved "sub-delims".
// We also need to leave an encoded "%" alone!
//
// We may not need to honour all of these in practice, but let's start
// cautious. Some are only reserved in particular contexts, which may
// depend on the scheme.
#define URL_PRESERVE ":/?#[]@" "!$&'()*+,;=" "%"
/** Prettify a URL.
*
* Undo RFC3986 escaping which doesn't affect semantics in practice, to make
* a prettier version of a URL to show the user, but which should still work
* if copied and pasted.
*/
inline void
url_prettify(std::string & url)
{
size_t pcent = url.find('%');
// Fast path for URLs without a % in.
if (pcent == std::string::npos || pcent + 2 >= url.size())
return;
size_t start = 0;
std::string in;
swap(in, url);
url.reserve(in.size());
while (true) {
// We've checked there are at least two bytes after the '%' already.
if (isxdigit(in[pcent + 1]) && isxdigit(in[pcent + 2])) {
int ch = (hex_decode_(in[pcent + 1]) << 4);
ch |= hex_decode_(in[pcent + 2]);
// FIXME: It would be nice to unescape top bit set bytes, at least
// when they form valid UTF-8 sequences.
if (0x20 <= ch && ch < 0x7f && !strchr(URL_PRESERVE, ch)) {
url.append(in, start, pcent - start);
url += char(ch);
pcent += 3;
start = pcent;
} else {
pcent += 3;
}
} else {
++pcent;
}
pcent = in.find('%', pcent);
if (pcent == std::string::npos || pcent + 2 >= in.size()) {
url.append(in, start, std::string::npos);
return;
}
}
}
#endif // OMEGA_INCLUDED_URLDECODE_H
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