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// file : web/mime-url-encoding.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <web/mime-url-encoding>
#include <ios> // hex, uppercase, right
#include <string>
#include <iomanip> // setw(), setfill ()
#include <ostream>
#include <sstream>
#include <cstring> // size_t, strspn()
#include <stdexcept> // invalid_argument
using namespace std;
namespace web
{
// Encode characters different from unreserved ones specified in
// "2.3. Unreserved Characters" of http://tools.ietf.org/html/rfc3986.
//
void
mime_url_encode (const char* v, ostream& o)
{
char f (o.fill ());
ostream::fmtflags g (o.flags ());
o << hex << uppercase << right << setfill ('0');
char c;
while ((c = *v++) != '\0')
{
if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') ||
(c >= '0' && c <= '9'))
{
o << c;
}
else
{
switch (c)
{
case ' ': o << '+'; break;
case '.':
case '_':
case '-':
case '~': o << c; break;
default:
{
o << "%" << setw (2) << static_cast<unsigned short> (c);
break;
}
}
}
}
o.flags (g);
o.fill (f);
}
string
mime_url_encode (const char* v)
{
stringstream o;
mime_url_encode (v, o);
return o.str ();
}
string
mime_url_encode (const string& v)
{
return mime_url_encode (v.c_str ());
}
string
mime_url_decode (const char* b, const char* e, bool trim)
{
if (trim)
{
b += strspn (b, " ");
if (b >= e)
return string ();
while (*--e == ' ');
++e;
}
string value;
value.reserve (e - b);
char bf[3];
bf[2] = '\0';
while (b != e)
{
char c (*b++);
switch (c)
{
case '+':
{
value.append (" ");
break;
}
case '%':
{
if (*b == '\0' || b[1] == '\0')
{
throw invalid_argument ("::web::mime_url_decode short");
}
*bf = *b;
bf[1] = b[1];
char* ebf (nullptr);
size_t vl (strtoul (bf, &ebf, 16));
if (*ebf != '\0')
{
throw invalid_argument ("::web::mime_url_decode wrong");
}
value.append (1, static_cast<char> (vl));
b += 2;
break;
}
default:
{
value.append (1, c);
break;
}
}
}
return value;
}
}
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