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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "url_escape.h"
#include <stdexcept>
#include <sstream>
std::string url_escape(const std::string& s)
{
std::string out;
for (auto c : s) {
if (std::isalnum(c) || c == '-' || c == '.' || c == '_' || c == '~' ||
c == '/') {
out.push_back(c);
} else {
char t[4];
snprintf(t, sizeof(t), "%%%02x", (int)(unsigned char)c);
out.append(t);
}
}
return out;
}
std::string url_unescape(const std::string& s)
{
std::string out;
const char *end = s.c_str() + s.size();
for (const char *c = s.c_str(); c < end; ++c) {
switch (*c) {
case '%':
{
unsigned char v = 0;
for (unsigned i=0; i<2; ++i) {
++c;
if (c >= end) {
std::ostringstream ss;
ss << "invalid escaped string at pos " << (c - s.c_str()) << " of '"
<< s << "'";
throw std::runtime_error(ss.str());
}
v <<= 4;
if (*c >= '0' && *c <= '9') {
v += *c - '0';
} else if (*c >= 'a' && *c <= 'f') {
v += *c - 'a' + 10;
} else if (*c >= 'A' && *c <= 'F') {
v += *c - 'A' + 10;
} else {
std::ostringstream ss;
ss << "invalid escaped string at pos " << (c - s.c_str()) << " of '"
<< s << "'";
throw std::runtime_error(ss.str());
}
}
out.push_back(v);
}
break;
default:
out.push_back(*c);
}
}
return out;
}
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