xapian-applications/omega/urlencode.cc

   1 /** @file
   2  * @brief URL encoding as described by RFC3986.
   3  */
   4 /* Copyright (C) 2011,2014,2015 Olly Betts
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to
   8  * deal in the Software without restriction, including without limitation the
   9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 #include <config.h>
  26
  27 #include "urlencode.h"
  28
  29 #include "stringutils.h"
  30
  31 #include <cstring>
  32 #include <string>
  33
  34 using namespace std;
  35
  36 void
  37 url_encode_(string & res, const char * p, size_t len, const char * safe)
  38 {
  39     for ( ; len ; --len) {
  40         unsigned char ch = *p++;
  41         if (C_isalnum(ch) || strchr(safe, ch)) {
  42             // Unreserved by RFC3986.
  43             res += ch;
  44         } else {
  45             // RFC3986 says we "should" encode as upper case hex digits.
  46             res += '%';
  47             res += "0123456789ABCDEF"[ch >> 4];
  48             res += "0123456789ABCDEF"[ch & 0x0f];
  49         }
  50     }
  51 }